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WO2009075525A2 - Field-assemblable apparatus for manufacturing steel pipes - Google Patents

Field-assemblable apparatus for manufacturing steel pipes Download PDF

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Publication number
WO2009075525A2
WO2009075525A2 PCT/KR2008/007321 KR2008007321W WO2009075525A2 WO 2009075525 A2 WO2009075525 A2 WO 2009075525A2 KR 2008007321 W KR2008007321 W KR 2008007321W WO 2009075525 A2 WO2009075525 A2 WO 2009075525A2
Authority
WO
WIPO (PCT)
Prior art keywords
steel pipe
field
steel
header
assemblable
Prior art date
Application number
PCT/KR2008/007321
Other languages
French (fr)
Other versions
WO2009075525A3 (en
Inventor
Nam-Jae Lee
Original Assignee
Nam-Jae Lee
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020070128303A external-priority patent/KR100903362B1/en
Priority claimed from KR1020080105376A external-priority patent/KR101051071B1/en
Priority claimed from KR1020080105375A external-priority patent/KR101051070B1/en
Application filed by Nam-Jae Lee filed Critical Nam-Jae Lee
Publication of WO2009075525A2 publication Critical patent/WO2009075525A2/en
Publication of WO2009075525A3 publication Critical patent/WO2009075525A3/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/122—Making tubes or metal hoses with helically arranged seams with welded or soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/123—Making tubes or metal hoses with helically arranged seams of coated strip material; Making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/126—Supply, or operations combined with supply, of strip material

Definitions

  • the present invention relates to a field- assemblable apparatus for manufacturing steel pipes, which includes at least one steel pipe carrying unit having a movable connection structure and first and second steel pipe supports arranged on the steel pipe carrying unit, and which supplies a strip of steel sheet in a spiral shape and cuts or connects the steel sheet, supplied in the spiral shape, so as to manufacture and provide a steel pipe having an intended dimension in the field.
  • Background Art
  • Metal pipes used for feeding fluid such as tap water pipes and sewer pipes are generally covered or coated with for example epoxy resin on the inner or outer surfaces of a pipe body in order to prevent the interior of the pipe body from oxidative corrosion or foreign materials from sticking to the interior, as otherwise these would contaminate the interior to thereby degrade the quality of water.
  • the type of pipe onto which the epoxy resin and the like is applied may include a steel pipe, which is manufactured by winding a steel sheet and integrally connecting adjoining edges, and a cast iron pipe, which is manufactured by pouring molten iron into a centrifugal casting mold.
  • a method for manufacturing large diameter steel pipes is disclosed in Korean Patent No. 0216507.
  • a coil of steel sheet 2 manufactured in an iron making process passes through a short blasting machine 7, which removes rust from top and bottom surfaces of the planar steel sheet 6 by injecting balls from above and below, while being drawn out as a planar sheet 6 through a leveler 3, a side trimmer 4 and drive rollers 5.
  • the planar steel sheet 6 is converted into a cylindrical steel pipe 9 in a pipe forming process 1.
  • forming rollers 8 spirally roll the planar steel sheet 6 into a cylindrical shape, which is then rotated and carried along the axial direction, so that adjoining portions of respective turns of the cylindrical steel sheet are welded to thereby form the cylindrical steel pipe 9.
  • the cylindrical steel pipe 9 manufactured in the pipe forming process 1 are continuously rotated and carried along the axial direction by the rotation of rollers 10 to pass through a heating machine 11.
  • the heating machine 11 is shaped as a cylinder 12, with an electrical heater 14 buried in an outer circumferential portion 13 of the cylinder 12, to heat the surface of the steel pipe 9 to a temperature ranging from 80 to 100 0 C. This facilitates adsorption of epoxy resin on the surface of the steel pipe 9 in the following process.
  • the steel pipe 9 passes through an epoxy resin coater 15 using an injection nozzle 17 for performing an epoxy resin coating process, during which an epoxy resin layer is formed on the steel pipe 9, and dripping epoxy resin is collected in a collection chamber 19.
  • PE wrapping process in which strips of PE wraps 22 and 22', continuously extruded from PE extruders 21 and 23, are covered on the steel pipe 9 with edges of the PE wraps 22 and 22' overlapping each other.
  • the steel pipe 9 covered with the PE wraps is cooled through a cooling machine 24 equipped with spray nozzles 25, and sprayed cooling water is collected in a water chamber 26. Finally, the steel pipe 9 is cut at a predetermined length by a cutting machine 27.
  • An aspect of the present invention is to provide a field-assemblable apparatus for manufacturing steel pipes, which can manufacture and provide a steel pipe having an intended dimension in the field, which can be easily installed in the field irrespective of ground conditions providing only that a minimum space is present, can be easily assembled and disassembled, easily manufacture steel pipes having intended diameters, and be transported to an intended location.
  • Another aspect of the present invention is to provide a field-assemblable apparatus for manufacturing steel pipes, which can easily support and supply a coiled steel sheet irrespective of the diameter of the coiled steel sheet, easily input the steel sheet irrespective of the diameter of the steel sheet, and easily adjust the input angle of the steel sheet according to an intended diameter of a steel pipe.
  • a field- as semblable apparatus for manufacturing steel pipes may include at least one steel pipe carrying unit connected along the length thereof; at least one robot unit for producing a steel pipe by connecting adjoining portions of respective turns of a steel sheet; and first and second steel pipe supports for rotating the steel pipe while moving on the steel pipe carrying unit when the robot unit is welding the steel sheet into the spiral steel pipe, so that the steel pipe is continuously manufactured, wherein the robot unit and the first and second steel pipe supports are provided on the steel pipe carrying unit.
  • the robot unit of the present invention may be transported along the steel pipe carrying unit by moving means, and the steel pipe carrying unit may include a plurality of idle rollers arranged along the length thereof to support the steel pipe.
  • the first steel pipe support may include a first header for defining an outer diameter corresponding the inner diameter of the steel pipe when rotated
  • the second steel pipe support may include a second header second header for maintaining a rotation rate the same as that of the first header so as to continuously form a circle supported by the first steel pipe support
  • the steel pipe carrying unit may have a guide recess caved in the central portion thereof, with a guide groove and a guide rail provided inside the guide recess, so that both the first and second steel pipe supports are transported along the steel pipe carrying unit.
  • the first steel pipe support may include a stationary block and a movable block.
  • a header body is supported in the guide groove of the steel pipe carrying unit.
  • the movable block is arranged on the stationary block so as to be moved up and down by a cylinder.
  • each of the first and second headers may include a shaft connected to the movable block, cylinders radially arranged around the first shaft and header blocks each connected to one end of a corresponding one of the first cylinders.
  • a raw material supply unit may also be provided on one side of the steel pipe carrying unit.
  • the raw material supply unit is provided with transportation wheels on the underside thereof so as to move to an intended place, and includes a stationary plate and a movable plate, which is placed on and connected with the stationary plate via rotating means.
  • the movable plate includes a coil support and a coil-pressing part.
  • the apparatus for manufacturing steel pipes can be easily transported to an intended location to manufacture and provide a steel pipe having an intended dimension in the field. Since the apparatus can be balanced by the bar-shaped positioning members, it can be easily installed in the field irrespective of ground conditions provided only that a minimal space is present and also can be easily assembled and disassembled.
  • the apparatus can also manufacture and provide various sizes of steel pipes in the field, particularly, without limitations in diameter and length.
  • the apparatus can also manufacture a variety of pipe connection structures using steel pipes having a variety of diameters.
  • a coiled steel sheet can be easily supported and supplied irrespective of the diameter of the coiled steel sheet, and the input angle of the steel sheet can be easily adjusted according to an intended diameter of steel pipe.
  • FIG. 1 is a process view illustrating a conventional method of manufacturing large diameter steel pipes
  • FIG. 2 is a perspective view illustrating an apparatus for manufacturing steel pipes according to the present invention
  • FIG. 3 is a side view illustrating a first steel pipe support of the apparatus for manufacturing steel pipes according to the present invention
  • FIG. 4 is side view illustrating the apparatus for manufacturing steel pipes according to the present invention.
  • FIG. 5 is a plan view illustrating the apparatus for manufacturing steel pipes according to the present invention.
  • FIG. 6 is a perspective view illustrating the state of manufacturing steel pipes according to the present invention.
  • FIG. 7 is a perspective view illustrating an apparatus for manufacturing steel pipes according to another embodiment of the present invention.
  • FIG. 8 is a perspective view illustrating the connection state of a steel pipe carrying unit in the apparatus for manufacturing steel pipes according to another embodiment of the present invention.
  • FIGS. 9 and 10 are perspective views illustrating the state in which steel pipes are manufactured by the apparatus for manufacturing steel pipes according to another embodiment of the present invention.
  • FIG. 11 is a perspective view illustrating a robot unit mounted on the apparatus for manufacturing steel pipes according to another embodiment of the present invention.
  • FIG. 12 is a perspective view illustrating the operating state of a header in the apparatus for manufacturing steel pipes according to another embodiment of the present invention.
  • FIG. 13 is a perspective view illustrating the connection state of a steel pipe carrying unit of a raw material supply unit according to another embodiment of the present invention.
  • FIGS. 14 and 15 are perspective views illustrating the operating state of the raw material supply unit according to another embodiment of the present invention.
  • FIG. 16 is a sectional view illustrating the operating state of the raw material supply unit according to another embodiment of the present invention.
  • FIG. 17 is a perspective view illustrating the steel pipe carrying unit.
  • FIG. 2 is a perspective view illustrating an apparatus for manufacturing steel pipes according to the present invention
  • FIG. 3 is a side view illustrating a first steel pipe support of the apparatus for manufacturing steel pipes according to the present invention
  • FIG. 4 is side view illustrating the apparatus for manufacturing steel pipes according to the present invention
  • FIG. 5 is a plan view illustrating the apparatus for manufacturing steel pipes according to the present invention
  • FIG. 6 is a perspective view illustrating the state of manufacturing steel pipes according to the present invention.
  • the apparatus for manufacturing steel pipes according to the invention includes a steel pipe carrying unit 100, a robot unit 200 and a raw material support unit 300.
  • the steel pipe carrying unit 100 is provided with a first steel pipe support 150 and a second steel pipe support 170.
  • the robot unit 200 and the raw material support unit 300 are connected to the steel pipe carrying unit 100.
  • the steel pipe carrying unit 100 has a guide recess 130 extending along the length thereof, with guide grooves 131 formed in the guide recess 130.
  • the steel pipe carrying unit 100 also includes first transportation wheels 101 and first bar-shaped positioning members 103, which are hydraulically or manually actuated to ascend and descend, such that the unit 100 can be transported and be fixed in position.
  • the steel pipe carrying unit 100 is also provided with a first traction hook 105, and at least one guide rail 135 is provided in the bottom of the guide recess 130.
  • a rack gear 137 is provided on the guide rail 135.
  • the first steel pipe support 150 is supported in the guide grooves 131, and includes drive rollers 135-1 mounted on the underside thereof corresponding to the guide rail 135 and a pinion 137-1 mounted on the underside thereof corresponding to the rack gear 137.
  • the pinion 137-1 is actuated by a drive motor (not shown) arranged in the first steel pipe support 150.
  • the first steel pipe support 150 is connected at one end thereof to a first header 160.
  • the first header 160 includes a first shaft 161, a plurality of first cylinders 163 and a plurality of first header blocks 165.
  • the first shaft 161 is connected to the first steel pipe support 150 so as to be freely rotatable.
  • the first cylinders 163 are radially connected to the first shaft 161.
  • Each of the first header blocks 165 is connected to a corresponding one of the first cylinders 163 and protrudes from a first support surface 162.
  • the second steel pipe support 170 is configured to continuously convert a strip of steel sheet P, inserted into the steel pipe carrying unit 100, into a spiral shape through a second header 180.
  • the second steel pipe support 170 is of a cylindrical body coupled through a bracket
  • the steel pipe support 170 has a plurality of g uide rollers 173 arranged on the inner circumference thereof to bend the metal sheet into a spiral shape.
  • the second steel pipe support 170 defines, in a lateral portion thereof, an input-hole 175 through which the steel sheet P is inserted.
  • a pressing roller 177 for introducing the steel sheet into the header is provided adjacent to the input-hole 175 of the second steel pipe support 170 and is rotated by a drive motor (not shown) connected to one end thereof.
  • the second header 180 of this embodiment of the present invention includes a second shaft 181, a plurality of cylinders 183 and a plurality of second header blocks 185.
  • the second shaft 181 is connected to the second steel pipe support 170 so as to be rotatable, the cylinders 183 are radially connected to the second shaft 181, and each of the second header blocks 185 is connected to a corresponding one of the second cylinders 183 and protrudes from a second support surface 182.
  • the second steel pipe support 170 is also configured to be transported on the top of the rack gear 137 via the pinion 137-1.
  • the robot unit 200 is configured to weld the spiral metal sheet, which is continuously supplied by the second header 180 of the second steel pipe support 170.
  • a plurality of the robot units 200 are provided on the steel pipe carrying unit 100 to perform operations such as painting and cutting.
  • the raw material supply unit 300 is connected to the steel pipe carrying unit 100 via for example bolts so as to supply the steel sheet P to the second header 180.
  • the raw material supply unit 300 also includes a plurality of vertical rollers 310, a coil support 330 and a coil-pressing part 350.
  • the vertical rollers 310 support the steel sheet along the edges thereof, the coil support 330 supports the steel sheet, which is in the shape of a coil, and the coil-pressing part 350 presses the coil-shaped steel sheet into a planar shape.
  • the raw material supply unit 300 is provided with a plurality of transportation wheels 301 and a plurality of second bar-shaped positioning members 303.
  • the second positioning members 303 are hydraulically or manually actuated to ascend and descend.
  • the raw material supply unit 300 is also provided with a second traction hook 305.
  • the steel pipe carrying unit 100 is also provided with a plurality of idle rollers 400, which maintain a predetermined inclination to facilitate carrying the steel pipe while supporting the steel pipe from below.
  • the idle rollers 400 are arranged in slots, each of which is formed in the width direction of the steel pipe carrying unit 100, and are freely movable according to the diameter of a steel pipe to be manufactured, so as to easily support the steel pipe.
  • the steel pipe carrying unit 100 and the raw material supply unit 300 can be raised by manually or hydraulically descending the first and second bar-shaped positioning members 103 and 303 mounted on one side of the first and second transportation wheels, and then be horizontally held in position by the first and second transportation wheels. Accordingly, the steel pipe carrying unit 100 and the raw material supply unit 300 can be installed regardless of the evenness of the ground.
  • the steel pipe carrying unit 100 and the raw material supply unit 300 are connected with each other via bolts, which are mounted on one part thereof, so as to be separatable from each other.
  • each of the second steel pipe supports 170 can be coupled/decoupled with/from the steel pipe carrying unit 100 via a bracket 178 provided on one end thereof. With this construction, steel pipes can be manufactured with an intended diameter irrespective of the supplied steel sheet P.
  • the guide grooves 131 and the guide rail 135 are provided in the guide recess 130 of the steel pipe carrying unit 100 to allow movement of the first and second steel pipe supports 150 and 170.
  • the pinion is configured to rotate and move along the rack gear 137 in the guide recess 130 so that the first and second steel pipe supports 150 and 170 can move along the steel pipe carrying unit 100 for an intended distance at a predetermined speed.
  • the first header 160 of the first steel pipe support 150 is provided with a plurality of the first header blocks 165, which are displaced in the radial direction by the first cylinders 163, respectively, to closely contact and support the inner circumference of the supplied steel pipe, which is welded in the spiral shape. In this manner, the first header 160 is in close contact with the inner circumference of the steel pipe and is transported along with the first steel pipe support 150.
  • the second header 180 inside the second steel pipe support 170 is configured the same as the first header 160. Accordingly, when the second header blocks 185 expand, the second header 180 rotates in close contact with the guide rollers 173, which is provided on the inner diameter side of the second steel pipe support 170, so as to convert the steel sheet into a spiral shape.
  • the raw material supply unit 300 bends the coil-shaped steel sheet P into a planar shape by carrying the coil-shaped steel sheet from the coil support 330 through the coil-pressing part 350, and then supplies the planar steel sheet through the input-hole 175 of the second steel pipe support 170 to the second header 180.
  • a plurality of the vertical rollers 310 of the raw material supply unit 300 allow the steel sheet P to enter at an intended angle into the input-hole 175 of the second steel pipe support 170.
  • the connecting angle of the raw material supply unit 300 with respect to the steel pipe carrying unit 100 is adjusted according to the spiral angle corresponding to an intended diameter.
  • the moving first steel pipe support 150 supports the spirally- wound steel sheet, which is continuously supplied.
  • the robot unit 200 arranged on one side of the first steel pipe support 150, welds adjoining portions of respective turns of the spirally- wound steel sheet to thereby produce a steel pipe.
  • the welded steel pipe is moved in one direction, supported on the first steel pipe support 150.
  • the welding speed performed by the robot unit 200 is determined by systematically adjusting the rotation rate of the second header 180 and the transportation speed of the first steel pipe support 150.
  • first and second headers 160 and 180 are configured to be adjustable in diameters, and the second steel pipe support 170 coupling with and decoupling from the steel pipe carrying unit 100 is designed to match a variety of diameters. This configuration as a result allows steel pipes with a variety of diameters to be manufactured in the field.
  • the steel pipe carrying unit 100 is also provided with a plurality of the idle rollers 400, which maintain a predetermined inclination to support a steel pipe thereon, such that the steel pipe can be efficiently carried by the first header.
  • FIG. 7 is a perspective view illustrating an apparatus for manufacturing steel pipes according to another embodiment of the present invention
  • FIG. 8 is a perspective view illustrating the connection state of a steel pipe carrying unit in the apparatus for manufacturing steel pipes according to another embodiment of the present invention
  • FIGS. 9 and 10 are perspective views illustrating the state in which steel pipes are manufactured by the apparatus for manufacturing steel pipes according to another embodiment of the present invention
  • FIG. 11 is a perspective view illustrating a robot unit mounted on the apparatus for manufacturing steel pipes according to another embodiment of the present invention
  • FIG. 12 is a perspective view illustrating the operating state of a header in the apparatus for manufacturing steel pipes according to another embodiment of the present invention.
  • a plurality of the robot units 200 are provided to weld, cut or paint a steel pipe and are connected to the steel pipe carrying unit 100.
  • Each of the robot units 200 is configured to be carried along the steel pipe carrying unit 100 via moving means 151.
  • the moving means 151 are implemented with a combination of a fixed gear 151a and a rotary gear 151c.
  • the fixed gear 151a is provided on the top of the steel pipe carrying unit 100, and the rotary gear 151c is engaged with the fixed gear 151a to be rotated by a drive gear 151b.
  • first and second steel pipe supports 150 and 170 are configured to continuously manufacture a steel pipe 500 by rotating and carrying the steel pipe, which is converted from a strip of steel sheet P via spiral winding.
  • the first and second steel pipe supports 150 and 170 are also configured to press the inserted metal sheet with a curvature adequate for the manufacture of the steel pipe.
  • the first header 160 is provided to define an outer diameter corresponding to the inner diameter of the steel pipe while being rotated.
  • the first header 160 is provided with first stoppers 165-1, which support the steel sheet when it is being inserted into the first header.
  • the second header is provided to define an outer diameter corresponding to the inner diameter of the steel pipe by continuously forming a circle defined by the first steel pipe support 150 while maintaining a rotation rate the same as that of the first header.
  • the second header 180 is provided with a second stopper 185-1.
  • the first steel pipe support 150 includes a stationary block 150-1 and a movable block 150-3.
  • the stationary block 150-1 is connected to a the first header and is supported by the guide grooves 131 of the steel pipe carrying unit, and the movable block 150-3 is arranged on the stationary block 150-1 so as to be moved up and down by a cylinder.
  • the second steel pipe support 170 includes a stationary block and a movable block, which are configured substantially the same as those of the first steel pipe support.
  • the first header 160 is implemented with a connection structure of a first shaft 161, first cylinders 163 and first header blocks 165.
  • the first shaft 161 is connected to the movable block 150-3, and the first cylinders 163 are radially arranged around the first shaft 161.
  • Each of the first header blocks 165 is connected to one end of a corresponding one of the first cylinders 163, with one end of the first header block 165 connected with a corresponding one of the stoppers.
  • the second header 180 is implemented with a connection structure of a second shaft 181, a plurality of second cylinders 183 and a plurality of second header blocks 185.
  • the second cylinders 183 are radially arranged around the second shaft 181, and each of the second header blocks 185 is connected to one end of a corresponding one of the second cylinders 183, with one end of second header block 185 connected with a corresponding one of the stoppers.
  • support plates 450 are provided so as to be divided into a plurality of pieces as well as being coupled or decoupled via fixing members 455.
  • one end of the metal sheet P inserted from the raw material supply unit 300 is firstly cut by the robot unit 200 and is then fixed to the first header 160 by the first stopper 165-1 of the first steel pipe support 150.
  • the steel sheet P having a coiled shape is pressed into a planar shape by being sequentially introduced through the coil support 330 and the coil-pressing part 350 and is then coupled with the first stopper of the first steel pipe support 150.
  • the steel sheet is converted into a cylindrical shape to form a steel pipe.
  • the first stopper 165-1 is configured to protrude from the first header block 165 to properly support the steel sheet.
  • the steel sheet is fixed at one end thereof to the first stopper 165-1 of the cylindrical first header 160.
  • the first header 160 is rotated and the steel sheet is pressed by pressing rollers 178 so as to be wound into a spiral shape.
  • the second steel pipe support 170 opposite the first steel pipe support 150 is transported towards the pressing rollers 178 so that the spiral steel pipe can be continuously manufactured.
  • the steel pipe carrying unit 100 includes a plurality of input rollers 107 and the movable pressing rollers 178, which are fixed in position and are displaced to form faces corresponding to the first and second headers, such that the circumference defined by the top ends of the rollers forms a spiral curve corresponding to the diameter of the headers.
  • a plurality of idle rollers 400 movable in the width direction are provided to support steel pipes 500 having a variety of diameters.
  • the robot unit 200 is configured to perform operations such as welding, painting and cutting while being transported along the steel pipe carrying unit 100 by the moving means 151, which is a combination of the fixing gear 151a formed on the top of the steel pipe carrying unit 100 and the rotary gear 151c thread-engaged with the fixing gear 151a and rotatable by the drive gear 151b.
  • the first header 160 has the connection structure including the first shaft 161 connected to the movable block 150-3, the first cylinders 163 radially arranged around the first shaft 161 and the first header blocks 165 connected to one end of the first cylinders 163, with one end of the first header blocks 165 connected with the stopper.
  • the second header 180 has the connection structure including the second shaft 181, the second cylinders 183 radially arranged around the second shaft 181, and the second header blocks 185 connected to one end of the second cylinders 183, with one end of second header blocks 185 connected with the stoppers, respectively.
  • each of the first and second steel pipe supports on which the first and second headers 160 and 180 are supported, includes the stationary block 150-1 supported by the guide grooves 131 of the steel pipe carrying unit and the movable block 150-3 arranged on the stationary block 150-1 so as to be moved up and down by a cylinder.
  • each of the first and second steel pipe supports can move upwards in the manufacturing of a large sized steel pipe and thus easily support the large sized steel pipe.
  • the support plates 450 corresponding to a large diameter are configured to couple/decouple with/from the first and second header blocks 165 and 185 via the fixing members 455 so as to support the entire inner circumference of the size of the diameter steel pipe through close contact therewith.
  • FIG. 13 is a perspective view illustrating the connection state of a steel pipe carrying unit of a raw material supply unit according to another embodiment of the present invention
  • FIGS. 14 and 15 are perspective views illustrating the operating state of the raw material supply unit according to another embodiment of the present invention
  • FIG. 16 is a sectional view illustrating the operating state of the raw material supply unit according to another embodiment of the present invention.
  • the raw material supply unit 300 of the present invention has a connection structure of a stationary plate 310 and a movable plate 320 arranged on the top of the stationary plate 310.
  • the stationary plate 310 is provided with transportation wheels 301 on the underside thereof to move to an intended place.
  • the movable plate 320 is constructed on the top of the stationary plate 310 so as to be rotatable by rotating means 340, and a coil support 330 and coil-pressing part 350 are fixed to the upper portion of the movable plate 320.
  • the coil support 330 is connected to a stationary block 331 and a movable block 335, which is connected to the upper portion of the stationary block 331 via a cylinder 333 so as to be moved up and down.
  • the movable block 335 has a rotary bar
  • the rotary bar 335-1 is configured to rotate at a predetermined rate by a motor, which is connected to one end of the rotary bar 335-1.
  • the coil-pressing part 350 is implemented with a combination of at least one guide roller 351 and at least one pressing roller 353, both of which are provided in a housing 337.
  • the pressing roller 353 is movably installed, supported on a movable shaft
  • the rotating means 340 is a combination of a follower gear 341 connected to the movable plate 320 and a driving gear 345 mounted on the stationary plate 310 to be rotatable by a drive motor 343.
  • a tractor drives the stationary plate 310 on the transportation wheels 301 to a position adjacent to one side of the steel pipe carrying unit 100.
  • the movable plate 320 provided on the top of the stationary plate 310 to support a coil-shaped strip of steel sheet P, is configured to rotate around the stationary plate 310 via the rotating means 340 so as to maintain a suitable input angle with respect to the steel pipe carrying unit 100.
  • the steel sheet P is fitted around and fixed to the rotary bar 335-1 of the movable block 335.
  • the movable block 335 is then moved up or down with respect to the stationary block 331 supported on the movable plate 320, particularly, according to the diameter of the coil-shaped steel sheet P so as to facilitate unwinding the coil-shaped steel sheet
  • FIG. 17 is a perspective view illustrating the steel pipe carrying unit.
  • the steel pipe carrying unit 100 includes first and second steel pipe supports 160 and 170, which are configured in the shape of pliers to support a small size steel pipe.
  • the steel pipe carrying unit 100 further includes a plurality of the steel pipe supports 160, which are in the shape of pliers to support a small-sized steel pipe.
  • the steel pipe supports 160 which are in the shape of pliers to support a small-sized steel pipe.
  • the field-assemblable apparatus for manufacturing steel pipes can manufacture spiral steel pipes in the field, where the pipes will be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

A field-assemblable apparatus for manufacturing spiral steel pipes includes one or more steel pipe carrying unit having a connection structure, a first steel pipe support having a first header and movable along the steel pipe carrying unit, and a second steel pipe support for continuously converting a steel sheet inserted into the steel pipe carrying unit into a spiral shape having an intended diameter using a second header. Steel pipes having intended diameters can be manufactured and supplied in the field.

Description

Description
FIELD-ASSEMBLABLE APPARATUS FOR MANUFACTURING
STEEL PIPES
Technical Field
[1] The present invention relates to a field- assemblable apparatus for manufacturing steel pipes, which includes at least one steel pipe carrying unit having a movable connection structure and first and second steel pipe supports arranged on the steel pipe carrying unit, and which supplies a strip of steel sheet in a spiral shape and cuts or connects the steel sheet, supplied in the spiral shape, so as to manufacture and provide a steel pipe having an intended dimension in the field. Background Art
[2] Metal pipes used for feeding fluid such as tap water pipes and sewer pipes are generally covered or coated with for example epoxy resin on the inner or outer surfaces of a pipe body in order to prevent the interior of the pipe body from oxidative corrosion or foreign materials from sticking to the interior, as otherwise these would contaminate the interior to thereby degrade the quality of water.
[3] The type of pipe onto which the epoxy resin and the like is applied may include a steel pipe, which is manufactured by winding a steel sheet and integrally connecting adjoining edges, and a cast iron pipe, which is manufactured by pouring molten iron into a centrifugal casting mold.
[4] In the case of the steel pipe manufactured by welding, a steel sheet supplied in a coil is welded after being expanded into a spiral shape, or respective steel sheets are welded after being bent into a circular shape. Since the steel pipe manufactured as such is corroded during storage and transportation, rust is removed from the inner and outer surfaces of the steel pipe using a short blasting machine before epoxy resin is coated or Poly Ethylene (PE) covering is performed on the inner and outer surfaces.
[5] As an approach generally used in relation with this technique, a method for manufacturing large diameter steel pipes is disclosed in Korean Patent No. 0216507. A coil of steel sheet 2 manufactured in an iron making process passes through a short blasting machine 7, which removes rust from top and bottom surfaces of the planar steel sheet 6 by injecting balls from above and below, while being drawn out as a planar sheet 6 through a leveler 3, a side trimmer 4 and drive rollers 5. Then, the planar steel sheet 6 is converted into a cylindrical steel pipe 9 in a pipe forming process 1. Specifically, forming rollers 8 spirally roll the planar steel sheet 6 into a cylindrical shape, which is then rotated and carried along the axial direction, so that adjoining portions of respective turns of the cylindrical steel sheet are welded to thereby form the cylindrical steel pipe 9.
[6] The cylindrical steel pipe 9 manufactured in the pipe forming process 1 are continuously rotated and carried along the axial direction by the rotation of rollers 10 to pass through a heating machine 11. The heating machine 11 is shaped as a cylinder 12, with an electrical heater 14 buried in an outer circumferential portion 13 of the cylinder 12, to heat the surface of the steel pipe 9 to a temperature ranging from 80 to 100 0C. This facilitates adsorption of epoxy resin on the surface of the steel pipe 9 in the following process.
[7] Then, the steel pipe 9 passes through an epoxy resin coater 15 using an injection nozzle 17 for performing an epoxy resin coating process, during which an epoxy resin layer is formed on the steel pipe 9, and dripping epoxy resin is collected in a collection chamber 19.
[8] Next, the steel pipe 9 with the epoxy resin layer 18 formed thereon is subjected to a
PE wrapping process in which strips of PE wraps 22 and 22', continuously extruded from PE extruders 21 and 23, are covered on the steel pipe 9 with edges of the PE wraps 22 and 22' overlapping each other. The steel pipe 9 covered with the PE wraps is cooled through a cooling machine 24 equipped with spray nozzles 25, and sprayed cooling water is collected in a water chamber 26. Finally, the steel pipe 9 is cut at a predetermined length by a cutting machine 27.
[9] The method for manufacturing steel pipes as described above is applied to a system for continuously mass-producing large diameter steel pipes. However, since this system uses large pieces of equipment, a large installation space is required as a drawback. Moreover, steel pipes having an intended diameter cannot be instantly supplied in the field. Disclosure of Invention Technical Problem
[10] An aspect of the present invention is to provide a field-assemblable apparatus for manufacturing steel pipes, which can manufacture and provide a steel pipe having an intended dimension in the field, which can be easily installed in the field irrespective of ground conditions providing only that a minimum space is present, can be easily assembled and disassembled, easily manufacture steel pipes having intended diameters, and be transported to an intended location.
[11] Another aspect of the present invention is to provide a field-assemblable apparatus for manufacturing steel pipes, which can easily support and supply a coiled steel sheet irrespective of the diameter of the coiled steel sheet, easily input the steel sheet irrespective of the diameter of the steel sheet, and easily adjust the input angle of the steel sheet according to an intended diameter of a steel pipe. Technical Solution
[12] According to an aspect of the present invention, there is provided a field- as semblable apparatus for manufacturing steel pipes. The field- as semblable apparatus for manufacturing steel pipes may include at least one steel pipe carrying unit connected along the length thereof; at least one robot unit for producing a steel pipe by connecting adjoining portions of respective turns of a steel sheet; and first and second steel pipe supports for rotating the steel pipe while moving on the steel pipe carrying unit when the robot unit is welding the steel sheet into the spiral steel pipe, so that the steel pipe is continuously manufactured, wherein the robot unit and the first and second steel pipe supports are provided on the steel pipe carrying unit.
[13] In the field-assemblable apparatus for manufacturing steel pipes of the present invention, the robot unit of the present invention may be transported along the steel pipe carrying unit by moving means, and the steel pipe carrying unit may include a plurality of idle rollers arranged along the length thereof to support the steel pipe.
[14] In the field-assemblable apparatus for manufacturing steel pipes of the present invention, the first steel pipe support may include a first header for defining an outer diameter corresponding the inner diameter of the steel pipe when rotated, and the second steel pipe support may include a second header second header for maintaining a rotation rate the same as that of the first header so as to continuously form a circle supported by the first steel pipe support.
[15] In the field-assemblable apparatus for manufacturing steel pipes of the present invention, the steel pipe carrying unit may have a guide recess caved in the central portion thereof, with a guide groove and a guide rail provided inside the guide recess, so that both the first and second steel pipe supports are transported along the steel pipe carrying unit.
[16] In the field-assemblable apparatus for manufacturing steel pipes of the present invention, the first steel pipe support may include a stationary block and a movable block. In the stationary block, a header body is supported in the guide groove of the steel pipe carrying unit. The movable block is arranged on the stationary block so as to be moved up and down by a cylinder.
[17] In addition, each of the first and second headers may include a shaft connected to the movable block, cylinders radially arranged around the first shaft and header blocks each connected to one end of a corresponding one of the first cylinders.
[18] In the field-assemblable apparatus for manufacturing steel pipes of the present invention, a raw material supply unit may also be provided on one side of the steel pipe carrying unit. The raw material supply unit is provided with transportation wheels on the underside thereof so as to move to an intended place, and includes a stationary plate and a movable plate, which is placed on and connected with the stationary plate via rotating means. The movable plate includes a coil support and a coil-pressing part.
Advantageous Effects
[19] According to embodiments of the present invention, the apparatus for manufacturing steel pipes can be easily transported to an intended location to manufacture and provide a steel pipe having an intended dimension in the field. Since the apparatus can be balanced by the bar-shaped positioning members, it can be easily installed in the field irrespective of ground conditions provided only that a minimal space is present and also can be easily assembled and disassembled. The apparatus can also manufacture and provide various sizes of steel pipes in the field, particularly, without limitations in diameter and length. The apparatus can also manufacture a variety of pipe connection structures using steel pipes having a variety of diameters.
[20] Furthermore, according to embodiments of the present invention, a coiled steel sheet can be easily supported and supplied irrespective of the diameter of the coiled steel sheet, and the input angle of the steel sheet can be easily adjusted according to an intended diameter of steel pipe. Brief Description of Drawings
[21] FIG. 1 is a process view illustrating a conventional method of manufacturing large diameter steel pipes;
[22] FIG. 2 is a perspective view illustrating an apparatus for manufacturing steel pipes according to the present invention;
[23] FIG. 3 is a side view illustrating a first steel pipe support of the apparatus for manufacturing steel pipes according to the present invention;
[24] FIG. 4 is side view illustrating the apparatus for manufacturing steel pipes according to the present invention;
[25] FIG. 5 is a plan view illustrating the apparatus for manufacturing steel pipes according to the present invention;
[26] FIG. 6 is a perspective view illustrating the state of manufacturing steel pipes according to the present invention;
[27] FIG. 7 is a perspective view illustrating an apparatus for manufacturing steel pipes according to another embodiment of the present invention;
[28] FIG. 8 is a perspective view illustrating the connection state of a steel pipe carrying unit in the apparatus for manufacturing steel pipes according to another embodiment of the present invention;
[29] FIGS. 9 and 10 are perspective views illustrating the state in which steel pipes are manufactured by the apparatus for manufacturing steel pipes according to another embodiment of the present invention; [30] FIG. 11 is a perspective view illustrating a robot unit mounted on the apparatus for manufacturing steel pipes according to another embodiment of the present invention;
[31] FIG. 12 is a perspective view illustrating the operating state of a header in the apparatus for manufacturing steel pipes according to another embodiment of the present invention;
[32] FIG. 13 is a perspective view illustrating the connection state of a steel pipe carrying unit of a raw material supply unit according to another embodiment of the present invention;
[33] FIGS. 14 and 15 are perspective views illustrating the operating state of the raw material supply unit according to another embodiment of the present invention;
[34] FIG. 16 is a sectional view illustrating the operating state of the raw material supply unit according to another embodiment of the present invention; and
[35] FIG. 17 is a perspective view illustrating the steel pipe carrying unit.
Best Mode for Carrying out the Invention
[36] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, in which exemplary embodiments thereof are shown.
[37] FIG. 2 is a perspective view illustrating an apparatus for manufacturing steel pipes according to the present invention, FIG. 3 is a side view illustrating a first steel pipe support of the apparatus for manufacturing steel pipes according to the present invention, FIG. 4 is side view illustrating the apparatus for manufacturing steel pipes according to the present invention, FIG. 5 is a plan view illustrating the apparatus for manufacturing steel pipes according to the present invention, and FIG. 6 is a perspective view illustrating the state of manufacturing steel pipes according to the present invention.
[38] The apparatus for manufacturing steel pipes according to the invention includes a steel pipe carrying unit 100, a robot unit 200 and a raw material support unit 300. The steel pipe carrying unit 100 is provided with a first steel pipe support 150 and a second steel pipe support 170. The robot unit 200 and the raw material support unit 300 are connected to the steel pipe carrying unit 100.
[39] The steel pipe carrying unit 100 has a guide recess 130 extending along the length thereof, with guide grooves 131 formed in the guide recess 130. The steel pipe carrying unit 100 also includes first transportation wheels 101 and first bar-shaped positioning members 103, which are hydraulically or manually actuated to ascend and descend, such that the unit 100 can be transported and be fixed in position.
[40] The steel pipe carrying unit 100 is also provided with a first traction hook 105, and at least one guide rail 135 is provided in the bottom of the guide recess 130.
[41] In addition, a rack gear 137 is provided on the guide rail 135. [42] The first steel pipe support 150 is supported in the guide grooves 131, and includes drive rollers 135-1 mounted on the underside thereof corresponding to the guide rail 135 and a pinion 137-1 mounted on the underside thereof corresponding to the rack gear 137. The pinion 137-1 is actuated by a drive motor (not shown) arranged in the first steel pipe support 150.
[43] The first steel pipe support 150 is connected at one end thereof to a first header 160.
[44] Here, the first header 160 includes a first shaft 161, a plurality of first cylinders 163 and a plurality of first header blocks 165. The first shaft 161 is connected to the first steel pipe support 150 so as to be freely rotatable. The first cylinders 163 are radially connected to the first shaft 161. Each of the first header blocks 165 is connected to a corresponding one of the first cylinders 163 and protrudes from a first support surface 162.
[45] The second steel pipe support 170 is configured to continuously convert a strip of steel sheet P, inserted into the steel pipe carrying unit 100, into a spiral shape through a second header 180.
[46] The second steel pipe support 170 is of a cylindrical body coupled through a bracket
178 to the steel pipe carrying unit 100. The steel pipe support 170 has a plurality of g uide rollers 173 arranged on the inner circumference thereof to bend the metal sheet into a spiral shape.
[47] In addition, the second steel pipe support 170 defines, in a lateral portion thereof, an input-hole 175 through which the steel sheet P is inserted.
[48] A pressing roller 177 for introducing the steel sheet into the header is provided adjacent to the input-hole 175 of the second steel pipe support 170 and is rotated by a drive motor (not shown) connected to one end thereof.
[49] Additionally, the second header 180 of this embodiment of the present invention includes a second shaft 181, a plurality of cylinders 183 and a plurality of second header blocks 185. The second shaft 181 is connected to the second steel pipe support 170 so as to be rotatable, the cylinders 183 are radially connected to the second shaft 181, and each of the second header blocks 185 is connected to a corresponding one of the second cylinders 183 and protrudes from a second support surface 182.
[50] Meanwhile, the second steel pipe support 170 is also configured to be transported on the top of the rack gear 137 via the pinion 137-1.
[51] The robot unit 200 is configured to weld the spiral metal sheet, which is continuously supplied by the second header 180 of the second steel pipe support 170.
[52] A plurality of the robot units 200 are provided on the steel pipe carrying unit 100 to perform operations such as painting and cutting.
[53] The raw material supply unit 300 is connected to the steel pipe carrying unit 100 via for example bolts so as to supply the steel sheet P to the second header 180. [54] The raw material supply unit 300 also includes a plurality of vertical rollers 310, a coil support 330 and a coil-pressing part 350. The vertical rollers 310 support the steel sheet along the edges thereof, the coil support 330 supports the steel sheet, which is in the shape of a coil, and the coil-pressing part 350 presses the coil-shaped steel sheet into a planar shape.
[55] In addition, the raw material supply unit 300 is provided with a plurality of transportation wheels 301 and a plurality of second bar-shaped positioning members 303. The second positioning members 303 are hydraulically or manually actuated to ascend and descend.
[56] The raw material supply unit 300 is also provided with a second traction hook 305.
[57] Additionally, the steel pipe carrying unit 100 is also provided with a plurality of idle rollers 400, which maintain a predetermined inclination to facilitate carrying the steel pipe while supporting the steel pipe from below.
[58] The idle rollers 400 are arranged in slots, each of which is formed in the width direction of the steel pipe carrying unit 100, and are freely movable according to the diameter of a steel pipe to be manufactured, so as to easily support the steel pipe.
[59] Below, a description will be made of the present invention having the above- described construction.
[60] As shown in FIGS. 2 through 6, in the present invention, when the steel pipe carrying unit 100 and the raw material supply unit 300 connected to the steel pipe carrying unit 100 with a predetermined inclination are drawn via the first and second traction hooks 105 and 305 by for example tractors, respectively, the underlying first and second transportation wheels 101 and 301 help the apparatus for manufacturing steel pipes be transported in the field to the place of installation.
[61] In addition, the steel pipe carrying unit 100 and the raw material supply unit 300 can be raised by manually or hydraulically descending the first and second bar-shaped positioning members 103 and 303 mounted on one side of the first and second transportation wheels, and then be horizontally held in position by the first and second transportation wheels. Accordingly, the steel pipe carrying unit 100 and the raw material supply unit 300 can be installed regardless of the evenness of the ground.
[62] The steel pipe carrying unit 100 and the raw material supply unit 300 are connected with each other via bolts, which are mounted on one part thereof, so as to be separatable from each other.
[63] In addition, a plurality of the second steel pipe supports 170 having a variety of inside diameters are provided. Each of the second steel pipe supports 170 can be coupled/decoupled with/from the steel pipe carrying unit 100 via a bracket 178 provided on one end thereof. With this construction, steel pipes can be manufactured with an intended diameter irrespective of the supplied steel sheet P. [64] The guide grooves 131 and the guide rail 135 are provided in the guide recess 130 of the steel pipe carrying unit 100 to allow movement of the first and second steel pipe supports 150 and 170.
[65] Here, the pinion is configured to rotate and move along the rack gear 137 in the guide recess 130 so that the first and second steel pipe supports 150 and 170 can move along the steel pipe carrying unit 100 for an intended distance at a predetermined speed.
[66] The first header 160 of the first steel pipe support 150 is provided with a plurality of the first header blocks 165, which are displaced in the radial direction by the first cylinders 163, respectively, to closely contact and support the inner circumference of the supplied steel pipe, which is welded in the spiral shape. In this manner, the first header 160 is in close contact with the inner circumference of the steel pipe and is transported along with the first steel pipe support 150.
[67] Likewise, the second header 180 inside the second steel pipe support 170 is configured the same as the first header 160. Accordingly, when the second header blocks 185 expand, the second header 180 rotates in close contact with the guide rollers 173, which is provided on the inner diameter side of the second steel pipe support 170, so as to convert the steel sheet into a spiral shape.
[68] In addition, the raw material supply unit 300 bends the coil-shaped steel sheet P into a planar shape by carrying the coil-shaped steel sheet from the coil support 330 through the coil-pressing part 350, and then supplies the planar steel sheet through the input-hole 175 of the second steel pipe support 170 to the second header 180.
[69] Here, a plurality of the vertical rollers 310 of the raw material supply unit 300 allow the steel sheet P to enter at an intended angle into the input-hole 175 of the second steel pipe support 170.
[70] In the apparatus for manufacturing steel pipes having the above-described construction, the connecting angle of the raw material supply unit 300 with respect to the steel pipe carrying unit 100 is adjusted according to the spiral angle corresponding to an intended diameter.
[71] When the steel sheet P, loaded in a coil shape on the raw material supply unit 300, is supplied into the input-hole 175 through the coil-pressing part 350 and the vertical rollers 310, the pressing roller 177 mounted adjacent to the input-hole 175 serves to supply the steel sheet P.
[72] Here, when the second header 180 of the second steel pipe support 170 is actuated to expand, the steel sheet is pressed between the second header and the guide rollers 173 of the second steel pipe support so as to be wound into a steel pipe shape having an intended diameter.
[73] In addition, in the first steel pipe support 150 on one side of the second steel pipe support 170, when steel sheet is being converted into a spiral shape, the first header blocks 165 are exposed to come into close contact with the steel sheet. In this manner, the moving first steel pipe support 150 supports the spirally- wound steel sheet, which is continuously supplied.
[74] Here, as the spirally- wound steel sheet is supplied, the robot unit 200, arranged on one side of the first steel pipe support 150, welds adjoining portions of respective turns of the spirally- wound steel sheet to thereby produce a steel pipe. The welded steel pipe is moved in one direction, supported on the first steel pipe support 150.
[75] The welding speed performed by the robot unit 200 is determined by systematically adjusting the rotation rate of the second header 180 and the transportation speed of the first steel pipe support 150.
[76] In addition, the first and second headers 160 and 180 are configured to be adjustable in diameters, and the second steel pipe support 170 coupling with and decoupling from the steel pipe carrying unit 100 is designed to match a variety of diameters. This configuration as a result allows steel pipes with a variety of diameters to be manufactured in the field.
[77] In addition, since the intended diameter of steel pipes can be obtained by varying the moving speed of the first header 160, the rotating rate of the second header 180 and the connecting angle of the raw material supply unit 300, even an unskilled person can easily manufacture steel pipes by inputting speed and angle values using a control program.
[78] Furthermore, the steel pipe carrying unit 100 is also provided with a plurality of the idle rollers 400, which maintain a predetermined inclination to support a steel pipe thereon, such that the steel pipe can be efficiently carried by the first header.
[79] FIG. 7 is a perspective view illustrating an apparatus for manufacturing steel pipes according to another embodiment of the present invention, FIG. 8 is a perspective view illustrating the connection state of a steel pipe carrying unit in the apparatus for manufacturing steel pipes according to another embodiment of the present invention, FIGS. 9 and 10 are perspective views illustrating the state in which steel pipes are manufactured by the apparatus for manufacturing steel pipes according to another embodiment of the present invention, FIG. 11 is a perspective view illustrating a robot unit mounted on the apparatus for manufacturing steel pipes according to another embodiment of the present invention, and FIG. 12 is a perspective view illustrating the operating state of a header in the apparatus for manufacturing steel pipes according to another embodiment of the present invention.
[80] A plurality of the robot units 200 are provided to weld, cut or paint a steel pipe and are connected to the steel pipe carrying unit 100.
[81] Each of the robot units 200 is configured to be carried along the steel pipe carrying unit 100 via moving means 151.
[82] The moving means 151 are implemented with a combination of a fixed gear 151a and a rotary gear 151c. The fixed gear 151a is provided on the top of the steel pipe carrying unit 100, and the rotary gear 151c is engaged with the fixed gear 151a to be rotated by a drive gear 151b.
[83] In the meantime, the first and second steel pipe supports 150 and 170 are configured to continuously manufacture a steel pipe 500 by rotating and carrying the steel pipe, which is converted from a strip of steel sheet P via spiral winding. The first and second steel pipe supports 150 and 170 are also configured to press the inserted metal sheet with a curvature adequate for the manufacture of the steel pipe.
[84] In addition, on the first steel pipe support 150, the first header 160 is provided to define an outer diameter corresponding to the inner diameter of the steel pipe while being rotated. The first header 160 is provided with first stoppers 165-1, which support the steel sheet when it is being inserted into the first header.
[85] In addition, on the second steel pipe support 170, the second header is provided to define an outer diameter corresponding to the inner diameter of the steel pipe by continuously forming a circle defined by the first steel pipe support 150 while maintaining a rotation rate the same as that of the first header. Like the first header, the second header 180 is provided with a second stopper 185-1.
[86] Here, the first steel pipe support 150 includes a stationary block 150-1 and a movable block 150-3. The stationary block 150-1 is connected to a the first header and is supported by the guide grooves 131 of the steel pipe carrying unit, and the movable block 150-3 is arranged on the stationary block 150-1 so as to be moved up and down by a cylinder. Likewise, the second steel pipe support 170 includes a stationary block and a movable block, which are configured substantially the same as those of the first steel pipe support.
[87] In addition, the first header 160 is implemented with a connection structure of a first shaft 161, first cylinders 163 and first header blocks 165. The first shaft 161 is connected to the movable block 150-3, and the first cylinders 163 are radially arranged around the first shaft 161. Each of the first header blocks 165 is connected to one end of a corresponding one of the first cylinders 163, with one end of the first header block 165 connected with a corresponding one of the stoppers.
[88] Likewise, the second header 180 is implemented with a connection structure of a second shaft 181, a plurality of second cylinders 183 and a plurality of second header blocks 185. The second cylinders 183 are radially arranged around the second shaft 181, and each of the second header blocks 185 is connected to one end of a corresponding one of the second cylinders 183, with one end of second header block 185 connected with a corresponding one of the stoppers. [89] As shown in FIG. 12, on the first header block 160, support plates 450 are provided so as to be divided into a plurality of pieces as well as being coupled or decoupled via fixing members 455.
[90] Now, a description will be made of the present invention having the above-described construction.
[91] As shown in FIGS. 7 through 12, one end of the metal sheet P inserted from the raw material supply unit 300 is firstly cut by the robot unit 200 and is then fixed to the first header 160 by the first stopper 165-1 of the first steel pipe support 150.
[92] The steel sheet P having a coiled shape is pressed into a planar shape by being sequentially introduced through the coil support 330 and the coil-pressing part 350 and is then coupled with the first stopper of the first steel pipe support 150. Here, the steel sheet is converted into a cylindrical shape to form a steel pipe.
[93] The first stopper 165-1 is configured to protrude from the first header block 165 to properly support the steel sheet.
[94] Next, the steel sheet is fixed at one end thereof to the first stopper 165-1 of the cylindrical first header 160. The first header 160 is rotated and the steel sheet is pressed by pressing rollers 178 so as to be wound into a spiral shape.
[95] Here, adjoining portions of respective turns of the spiral steel sheet P are welded by the robot unit 200 so that the steel pipe 500 is continuously formed.
[96] When the first steel pipe support 150 is transported along the steel pipe carrying unit
100, the second steel pipe support 170 opposite the first steel pipe support 150 is transported towards the pressing rollers 178 so that the spiral steel pipe can be continuously manufactured.
[97] Specifically, when the first steel pipe support 150 is transported, the second steel pipe support 170 rotating at the same rate is introduced to a position corresponding to the raw material supply unit 300 to convert the inserted steel sheet into a wound shape adequate for the manufacture of a steel pipe.
[98] In addition, the steel pipe carrying unit 100 includes a plurality of input rollers 107 and the movable pressing rollers 178, which are fixed in position and are displaced to form faces corresponding to the first and second headers, such that the circumference defined by the top ends of the rollers forms a spiral curve corresponding to the diameter of the headers.
[99] When at least one of the steel pipe carrying units 100 is connected in the longitudinal direction, a plurality of idle rollers 400 movable in the width direction are provided to support steel pipes 500 having a variety of diameters.
[100] The robot unit 200 is configured to perform operations such as welding, painting and cutting while being transported along the steel pipe carrying unit 100 by the moving means 151, which is a combination of the fixing gear 151a formed on the top of the steel pipe carrying unit 100 and the rotary gear 151c thread-engaged with the fixing gear 151a and rotatable by the drive gear 151b.
[101] In addition, the first header 160 has the connection structure including the first shaft 161 connected to the movable block 150-3, the first cylinders 163 radially arranged around the first shaft 161 and the first header blocks 165 connected to one end of the first cylinders 163, with one end of the first header blocks 165 connected with the stopper. Likewise, the second header 180 has the connection structure including the second shaft 181, the second cylinders 183 radially arranged around the second shaft 181, and the second header blocks 185 connected to one end of the second cylinders 183, with one end of second header blocks 185 connected with the stoppers, respectively. With these configurations, the first and second headers 160 and 180 can increase and reduce the diameter through the actuation of the cylinders, following the diameter of a steel pipe during manufacturing of the steel pipe.
[102] Further, each of the first and second steel pipe supports, on which the first and second headers 160 and 180 are supported, includes the stationary block 150-1 supported by the guide grooves 131 of the steel pipe carrying unit and the movable block 150-3 arranged on the stationary block 150-1 so as to be moved up and down by a cylinder. With this configuration, each of the first and second steel pipe supports can move upwards in the manufacturing of a large sized steel pipe and thus easily support the large sized steel pipe.
[103] In addition, the support plates 450 corresponding to a large diameter are configured to couple/decouple with/from the first and second header blocks 165 and 185 via the fixing members 455 so as to support the entire inner circumference of the size of the diameter steel pipe through close contact therewith.
[104] FIG. 13 is a perspective view illustrating the connection state of a steel pipe carrying unit of a raw material supply unit according to another embodiment of the present invention, FIGS. 14 and 15 are perspective views illustrating the operating state of the raw material supply unit according to another embodiment of the present invention, and FIG. 16 is a sectional view illustrating the operating state of the raw material supply unit according to another embodiment of the present invention.
[105] The raw material supply unit 300 of the present invention has a connection structure of a stationary plate 310 and a movable plate 320 arranged on the top of the stationary plate 310.
[106] The stationary plate 310 is provided with transportation wheels 301 on the underside thereof to move to an intended place.
[107] The movable plate 320 is constructed on the top of the stationary plate 310 so as to be rotatable by rotating means 340, and a coil support 330 and coil-pressing part 350 are fixed to the upper portion of the movable plate 320. [108] Here, the coil support 330 is connected to a stationary block 331 and a movable block 335, which is connected to the upper portion of the stationary block 331 via a cylinder 333 so as to be moved up and down. The movable block 335 has a rotary bar
335-1 protruding therefrom. [109] The rotary bar 335-1 is configured to rotate at a predetermined rate by a motor, which is connected to one end of the rotary bar 335-1. [110] In addition, the coil-pressing part 350 is implemented with a combination of at least one guide roller 351 and at least one pressing roller 353, both of which are provided in a housing 337. [I l l] Here, the pressing roller 353 is movably installed, supported on a movable shaft
353-3 connected to a cylinder 353-1. [112] The rotating means 340 is a combination of a follower gear 341 connected to the movable plate 320 and a driving gear 345 mounted on the stationary plate 310 to be rotatable by a drive motor 343. [113] Now, a description will be made of the present invention having the above-described construction. [114] Referring to FIGS. 13 through 16, in the present invention, a tractor drives the stationary plate 310 on the transportation wheels 301 to a position adjacent to one side of the steel pipe carrying unit 100. [115] Here, the movable plate 320, provided on the top of the stationary plate 310 to support a coil-shaped strip of steel sheet P, is configured to rotate around the stationary plate 310 via the rotating means 340 so as to maintain a suitable input angle with respect to the steel pipe carrying unit 100. [116] When the rotation angle of the movable plate 320 around the stationary plate 310 is determined, the steel sheet P is fitted around and fixed to the rotary bar 335-1 of the movable block 335. [117] The movable block 335 is then moved up or down with respect to the stationary block 331 supported on the movable plate 320, particularly, according to the diameter of the coil-shaped steel sheet P so as to facilitate unwinding the coil-shaped steel sheet
P. [118] Here, the movable block 335 can be easily moved up or down when hydraulic pressure is supplied through the cylinder 333 coupled with a connection part of the stationary block 331 and the movable block 335. [119] Next, the coil-pressing part 350 is a combination of at least one transfer roller 351 and at least one pressing roller 353, both of which are provided in the housing 337, to press the steel sheet into a planar shape by raising the pressing roller 353 and then inserting the steel sheet into the space between the transfer roller 351 and the pressing roller 353. [120] FIG. 17 is a perspective view illustrating the steel pipe carrying unit. The steel pipe carrying unit 100 includes first and second steel pipe supports 160 and 170, which are configured in the shape of pliers to support a small size steel pipe.
[121] Specifically, the steel pipe carrying unit 100 further includes a plurality of the steel pipe supports 160, which are in the shape of pliers to support a small-sized steel pipe. With this construction, it is possible to manufacture small-sized steel pipes and to connect the manufactured small size steel pipes with each other via welding and the like by supporting the pipes on the outer circumference thereof. Industrial Applicability
[122] According to embodiments of the present invention, the field-assemblable apparatus for manufacturing steel pipes can manufacture spiral steel pipes in the field, where the pipes will be used.

Claims

Claims
[1] A field-assemblable apparatus for manufacturing steel pipes, comprising: at least one steel pipe carrying unit connected into a length corresponding to that of a steel pipe to be manufactured, and movable on transportation wheels connected to an underside thereof; first and second steel pipe supports for rotating and moving the steel pipe supported by first and second headers from one end to the other end of the steel pipe carrying unit in order to convert a strip of steel sheet supplied thereto into a steel pipe having a spiral shape; and a robot unit for connecting adjoining portions of respective turns of the spiral steel sheet, which is continuously supplied.
[2] The field-assemblable apparatus according to claim 1, wherein the steel pipe carrying unit comprises a guide recess extending along a longitudinal direction thereof, the guide recess housing therein a guide groove supporting the steel pipe supports, a guide rail and a rack gear corresponding to pinions of the steel pipe supports.
[3] The field-assemblable apparatus according to claim 1, wherein the steel pipe carrying unit comprises: a bar-shaped positioning member arranged on one side of the transportation wheels to be hydraulically or manually moved up or down; and a traction hook at one end thereof.
[4] The field-assemblable apparatus according to claim 1, wherein the first header includes: a first shaft connected to the first steel pipe support so as to be freely rotatable; a plurality of first cylinders radially connected to the first shaft; and a plurality of first header blocks, each of the first header blocks connected to a corresponding one of the first cylinders so as to come into close contact with an inner circumference of the steel pipe.
[5] The field-assemblable apparatus according to claim 4, wherein the first header further includes a first stopper arranged on a corresponding one of the first header blocks so as to move up or down, thereby pressing the steel sheet.
[6] The field-assemblable apparatus according to claim 1, wherein the second steel pipe support receives at least a portion of the second header in close contact with the steel pipe having a variety of diameters, and has a plurality of guide rollers around an inner circumference and an input-hole in one portion thereof, through which the steel sheet is inserted.
[7] The field-assemblable apparatus according to claim 6, wherein a plurality of the second steel pipe supports corresponding to different diameters of the steel pipes are prepared to be attached/detached to/from the steel pipe carrying unit, wherein each of the second steel pipe supports has an input-hole in one portion thereof, through which the steel sheet is inserted, and a pressing roller arranged adjacent to the input-hole to input the steel sheet into the second header.
[8] The field- assemblable apparatus according to claim 1, wherein the second header includes: a second shaft connected to the second steel pipe support so as to be freely rotatable; a plurality of second cylinders radically connected to the second shaft; and a plurality of second header blocks, each of the second header blocks connected to a corresponding one of the second cylinders so as to come into close contact with an inner circumference portion of the steel pipe.
[9] The field- assemblable apparatus according to claim 1, wherein the steel pipe carrying unit further comprises a raw material supply unit supporting the steel sheet to supply the steel sheet to one of the steel pipe supports, wherein the raw material supply unit is movable on transportation wheels.
[10] The field-assemblable apparatus according to claim 9, wherein the raw material supply unit includes a plurality of vertical rollers for supplying the steel sheet by supporting edges thereof.
[11] The field-assemblable apparatus according to claim 10, wherein the raw material support part further includes a coil support supporting the steel sheet, which is coil-shaped, and a coil-pressing part pressing the coil-shaped steel sheet.
[12] The field-assemblable apparatus according to claim 1, wherein the raw material support part comprises an assembled structure of a stationary plate and a movable plate arranged on top of the stationary plate so as to be rotated by rotating means, wherein the stationary plate has transportation wheels on an underside thereof, and the movable plate is provided with a coil support and a coil-pressing part.
[13] The field-assemblable apparatus according to claim 12, wherein the coil support includes a stationary block and a movable block connected to an upper portion of the stationary block via a cylinder, the movable block having a rotary bar.
[14] The field-assemblable apparatus according to claim 12, wherein the coil-pressing part comprises a combination of at least one guide roller and at least one pressing roller, both of which are provided in a housing, wherein the pressing roller is supported by a movable shaft connected to the cylinder so as to be movable.
[15] The field-assemblable apparatus according to claim 12, wherein the rotating means comprises a combination of a follower gear connected to the movable plate and a drive gear mounted on the stationary plate so as to be rotated by a drive motor.
[16] The field-assemblable apparatus according to any one of claims 10 through 12, wherein the raw material supply unit is connected with a bar-shaped positioning member, the bar-shaped positioning member hydraulically or manually moved up or down, and has a traction hook.
[17] The field-assemblable apparatus according to claim 1, wherein the steel pipe carrying unit further comprises a plurality of idle rollers arranged with a predetermined inclination to support the steel pipe on a top surface thereof.
[18] The field-assemblable apparatus according to claim 17, wherein each of the idle rollers is movable through a slot formed in a width direction of the steel pipe carrying unit.
[19] The field-assemblable apparatus according to claim 1, comprising a plurality of the robot units for welding, cutting or painting the steel pipe while being moved along the steel pipe carrying unit by transporting means.
[20] The field-assemblable apparatus according to claim 19, wherein the transporting means comprise a combination of a stationary gear arranged on an upper portion of the steel pipe carrying unit and a rotary gear thread-engaging with the stationary gear, the rotary gear being rotatable by a drive motor.
[21] The field-assemblable apparatus according to claim 1, wherein the steel pipe carrying unit comprises a plurality of input rollers and a plurality of pressing rollers displaceable according to curvatures arranged on corresponding surface portions of first and second header blocks of the first and second headers so as to insert the steel sheet or apply pressure onto the inserted steel sheet.
[22] The field-assemblable apparatus according to claim 21, wherein the first header includes a first shaft connected to the first steel pipe support, a plurality of first cylinders radially connected to the first shaft and a plurality of first header blocks each connected to a corresponding one of the first cylinders and coming into close contact with an inner circumference of the steel pipe, the second header includes a second shaft connected to the second steel pipe support, a plurality of second cylinders radially connected to the second shaft and a plurality of second header blocks each connected to a corresponding one of the second cylinders and coming into close contact with an inner circumference of the steel pipe, and first and second stoppers are provided on the first and second header blocks, respectively, to move up and down thereby pressing the steel sheet.
[23] The field-assemblable apparatus according to claim 1, wherein the first and second headers of the first and second steel pipe supports are pliers-shaped such that the steel pipe carrying unit supports a small-sized steel pipe.
[24] The field-assemblable apparatus according to claim 1 or 22, wherein each of the first and second steel pipe supports includes a stationary block supported by a guide groove of the steel pipe carrying unit and a movable block arranged on top of the stationary block so as to be moved up or down by a cylinder, the movable block of the first steel pipe support connected to the first shaft of the first steel pipe support, and the movable block of the second steel pipe support connected to the second shaft of the second steel pipe support.
[25] The field-assemblable apparatus according to any one of claims 4, 8 and 22, wherein each of the first and second header blocks coming into close contact with an inner circumference of the steel pipe having a large diameter are configured to be assembled or disassembled via fixing members.
PCT/KR2008/007321 2007-12-11 2008-12-10 Field-assemblable apparatus for manufacturing steel pipes WO2009075525A2 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR10-2007-0128303 2007-12-11
KR1020070128303A KR100903362B1 (en) 2007-12-11 2007-12-11 A manufacturing device for a steel pipe with the spot assembling
KR1020080105376A KR101051071B1 (en) 2008-10-27 2008-10-27 Field assembled steel pipe manufacturing device
KR10-2008-0105376 2008-10-27
KR1020080105375A KR101051070B1 (en) 2008-10-27 2008-10-27 Field-assembled steel sheet input device
KR10-2008-0105375 2008-10-27

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WO2009075525A2 true WO2009075525A2 (en) 2009-06-18
WO2009075525A3 WO2009075525A3 (en) 2009-09-17

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CN108620448A (en) * 2018-04-20 2018-10-09 中国石油集团渤海石油装备制造有限公司 A kind of major diameter, high strength helical welded tube manufacturing method
CN108655204A (en) * 2018-04-02 2018-10-16 浙江永上特材有限公司 A kind of steel pipe marking press facilitating feeding and can prevent steel pipe from damaging
WO2022221929A1 (en) * 2021-04-20 2022-10-27 Memps-Tubos Helicoidais Indústria E Serviços Ltda Mobile helical tubing plant with steel sheet coil
US11701729B1 (en) 2022-01-28 2023-07-18 Samsung Engineering Co., Ltd. Automatic welding method
CN117102274A (en) * 2023-10-25 2023-11-24 点夺机电工程江苏有限公司 Ventilating duct roll forming equipment
US11897058B2 (en) 2022-01-28 2024-02-13 Samsung Engineering Co., Ltd. Weld groove forming method and hollow article

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108655204A (en) * 2018-04-02 2018-10-16 浙江永上特材有限公司 A kind of steel pipe marking press facilitating feeding and can prevent steel pipe from damaging
CN108620448A (en) * 2018-04-20 2018-10-09 中国石油集团渤海石油装备制造有限公司 A kind of major diameter, high strength helical welded tube manufacturing method
CN108620448B (en) * 2018-04-20 2021-02-09 中国石油集团渤海石油装备制造有限公司 Method for manufacturing large-diameter and high-strength spiral welded pipe
WO2022221929A1 (en) * 2021-04-20 2022-10-27 Memps-Tubos Helicoidais Indústria E Serviços Ltda Mobile helical tubing plant with steel sheet coil
EP4101555A4 (en) * 2021-04-20 2022-12-14 Memps-Tubos Helicoidais Indústria E Serviços Ltda Mobile helical tubing plant with steel sheet coil
US11701729B1 (en) 2022-01-28 2023-07-18 Samsung Engineering Co., Ltd. Automatic welding method
US11897058B2 (en) 2022-01-28 2024-02-13 Samsung Engineering Co., Ltd. Weld groove forming method and hollow article
CN117102274A (en) * 2023-10-25 2023-11-24 点夺机电工程江苏有限公司 Ventilating duct roll forming equipment
CN117102274B (en) * 2023-10-25 2023-12-26 点夺机电工程江苏有限公司 Ventilating duct roll forming equipment

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