JP2008229467A - Heat treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat treatment apparatus utilizable in a coating line when the surface to be coated of a workpiece pretreated by water washing or the like is dried or when the coated surface of the coated workpiece is dried/baked. <P>SOLUTION: The heat treatment apparatus is composed of: a bottom-open heat treatment furnace 40; heating means (a hot air circulation line 54, a heating means 55, a hot air circulation blower 56 and a controller 57) for heating the inside of the heat treatment furnace 40; a workpiece supporting rack 45 to be positioned just under the heat treatment furnace 40; and an upward/downward driving means 44 for upward/downward moving the work supporting rack 45 relatively to the heat treatment furnace 40 to vertically take the workpiece W supported by the work supporting rack 45 in and out of the heat treatment furnace 40. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat treatment apparatus that can be used in a coating line for drying a surface to be coated of a workpiece that has been pretreated, such as water washing, and drying / baking a painted surface of a workpiece after coating.

As described in Patent Document 1, as a heat treatment apparatus that batch-processes workpieces with this type of heat treatment apparatus, a heat treatment furnace is disposed beside the work conveyance path, and the conveyance traveling travels on the work conveyance path. 2. Description of the Related Art There is known a configuration in which a workpiece is taken in and out in a horizontal and lateral direction between the transfer traveling body and the inside of a heat treatment furnace by a workpiece transfer means such as a running fork system provided in the body.
JP-A-11-10056

  In the conventional batch type heat treatment apparatus as described above, since the opening for taking in and out the workpiece is provided horizontally in the lateral side wall of the heat treatment furnace, the opening can be closed during heat treatment or during standby. Heat treatment cannot be performed efficiently unless an open / close door is provided to prevent the hot air in the heat treatment furnace from escaping or heating means such as an infrared lamp that radiates heat rays toward the workpiece.

  An object of the present invention is to provide a heat treatment apparatus capable of solving the above-described conventional problems. In the invention described in claim 1, reference numerals of embodiments to be described later are given. As shown, the heat treatment furnace 40 opened on the lower side, the heating means in the heat treatment furnace 40 (the hot air circulation path 54, the heating means 55, the blower 56 for hot air circulation, and the controller 57) are located directly below the heat treatment furnace 40. Work support table 45, and elevating drive for moving workpiece W supported on work support table 45 up and down relative to heat treatment furnace 40 by moving the heat treatment furnace 40 and work support table 45 up and down relatively. A heat treatment apparatus composed of means 44 is proposed.

  In carrying out the present invention having the above-described configuration, specifically, as described in claim 2, a workpiece support base 45 is provided on the side of the workpiece conveyance path 2, travels along the workpiece conveyance path 2, and A workpiece transfer means 10 for transferring the workpiece W to and from the workpiece support base 45 can be provided on the transport traveling body 1 that can be stopped at the lateral position. In this case, as described in claim 3, a work support shelf (work temporary storage shelf 26) is provided on the opposite side of the work transport path 2 from the side on which the work support base 45 is provided, and the work transfer of the transport traveling body 1 is performed. The mounting means 10 can be moved back and forth on either the workpiece support base 45 side or the workpiece support shelf (work temporary storage shelf 26) side, and the workpiece W can be moved between the workpiece support shelf (work temporary storage shelf 26). It can comprise so that it can be mounted, and it can comprise so that the heat-processed workpiece | work W taken out from the workpiece | work support stand 45 may be transferred to a workpiece | work support shelf (work temporary storage shelf 26), and can be cooled.

  Further, as described in claim 4, the position of the heat treatment furnace 40 is fixed, and the elevating drive means 44 is arranged so that the work support base 45 is placed on the work transfer base 45 and the work transfer base 45 on the work support base 45. The workpiece W can be moved up and down between the upper limit position where the workpiece W enters the heat treatment furnace 40.

  In addition, as described in claim 5, the work support base 45 is mounted on a movable base 43 movable on the lower floor surface of the heat treatment furnace 40, and the movable base 43 includes the heat treatment furnace 40 and the work support base. The first position P1 at which the workpiece W supported by the workpiece support base 45 by relative movement with respect to the workpiece 45 can be loaded into the heat treatment furnace 40, and the second position for loading / unloading the workpiece W onto / from the workpiece support base 45. It can be configured to freely reciprocate with P2.

  Furthermore, as described in claim 6, when the workpiece W supported on the workpiece support base 45 is charged into the heat treatment furnace 40 by moving the heat treatment furnace 40 and the workpiece support base 45 relatively up and down, The workpiece support 45 can be configured to be positioned in the lower open portion (opening 51) of the heat treatment furnace 40. As described in claim 7, the workpiece W is supported on both sides by the supported portion ( The workpiece suspension base 15 is provided with the first supported portions 17a and 17b), and the workpiece support base 45 has both side supported portions of the workpiece suspension base 15 (first supported portions 17a and 17b). A pair of support rail members 49 are provided to support the workpiece W, and the workpiece W supported on the workpiece support base 45 via the workpiece suspension base 15 is suspended away from the workpiece support base 45. be able to.

  According to the heat treatment apparatus according to the first aspect of the present invention, the furnace lower side portion, which is a good heat transfer direction by convection from the bottom to the top in the furnace, is opened as a work inlet / outlet. Therefore, the hot air flowing in the heat treatment furnace in the hot air circulation method or the hot air in the heat ray irradiation method can be generated even if the lower opening of the heat treatment furnace, that is, the work inlet / outlet is not closed by the door during heat treatment or standby. There is little outflow through the lower open portion, and cold air outside the furnace does not flow into the heat treatment furnace during standby and the furnace temperature does not drop rapidly. Therefore, heat treatment can be performed relatively efficiently while providing a heat treatment apparatus having a simple structure and control without providing an opening / closing door at the work inlet / outlet of the heat treatment furnace. Of course, a hot air circulation type heating means can be easily used.

  The present invention according to claim 1 is configured to move the work support base along the work transport path by installing the work support base at an appropriate interval on, for example, a slat conveyor. A heat treatment furnace is arranged in the upper part of the work transfer path, and the work support base is stopped while the work support base supporting the work has arrived at a position directly below the heat treatment furnace, and the heat treatment furnace is lowered to Although it is possible to perform the heat treatment by relatively loading the work in the heat treatment furnace, according to the structure of claim 2, the work is transferred to and from the work support base. A workpiece conveyance path can be constituted by the traveling path of the conveyance traveling body provided with the workpiece transfer means, and the conveyance of the workpiece along this workpiece conveyance path is not related to the heat treatment of the workpiece in the heat treatment furnace. Can be performed, it is possible to construct a suitable equipment if features a temporary storage shelves facilities and work performing various operations on the workpiece other than the heat treatment furnace in the work conveyance path side.

  Further, when the configuration according to claim 2 is adopted, according to the configuration according to claim 3, when a cooling process generally required as a process subsequent to the heat treatment is performed on the heat-treated workpiece, the heat treatment furnace is used. By using a traveling body for transporting workpieces to the workpiece support stand, the heat-treated workpiece can be quickly transferred to the workpiece cooling support shelf, and the intended workpiece cooling process can be carried out. Thus, cooling can be performed more efficiently than when the work cooling process is performed in the heat treatment furnace by lowering the temperature in the heat treatment furnace or switching to supply of cooling air.

  When the present invention according to claim 1 is carried out, the heat treatment furnace can be raised and lowered with respect to the work support base, and the heat treatment furnace is lowered with respect to the work supported by the work support base. However, according to the configuration of claim 4, since the position of the heat treatment furnace is fixed, the heating means for heating the heat treatment furnace may be a hot air circulation system. The heating means can be easily adopted, and the present invention can be implemented easily and inexpensively.

  Furthermore, although the workpiece support base can be configured only to be able to move up and down, in this case, the workpiece must be loaded and unloaded on the workpiece support base positioned immediately below the heat treatment furnace. According to the configuration, the work unloading work with respect to the work support base can be performed in a state where the work support base is in the second position that is laterally separated from the position immediately below the heat treatment furnace. For example, even when performing work unloading work on the work support platform by human work, the work unloading work is safely performed in an environment that is not directly affected by the radiant heat radiated downward from the lower opening of the heat treatment furnace. Even when the work loading and unloading work is performed by the work transfer means provided in the transport traveling body, the travel path of the transport traveling body is flat. Can be separated laterally from the heat treatment furnace, it is easy to construct a travel path for the transport traveling body, and the lateral movement amount of the workpiece transfer means provided in the transport traveling body can be shortened. Since it can do, the structure of the said workpiece transfer means becomes easy.

  In addition, when the work supported by the heat treatment furnace and the work support is moved up and down relatively and the work supported on the work support is inserted into the heat treatment furnace, the work support is lower than the lower opening of the heat treatment furnace. However, according to the configuration of claim 6, the heat treatment furnace and the work support table are relatively moved up and down. When the work supported on the work support is loaded into the heat treatment furnace, the work support is located in the lower open part of the heat treatment furnace and narrows the passage opened in the vertical direction of the lower open part. Leakage of hot air to the lower side of the heat treatment furnace when the hot air circulation type heating means is adopted, and leakage of radiant heat to the lower side of the heat treatment furnace when the heating means of the heat ray irradiation method is adopted. Can be greatly reduced.

  Furthermore, although the workpiece can be placed on the workpiece support, according to the configuration of claim 7, the workpiece in the heat treatment furnace is suspended from the workpiece suspension platform and is entirely surrounded by the workpiece. Since it can be exposed to the high temperature atmosphere in the heat treatment furnace, the entire surface of the workpiece can be efficiently heat treated, and the workpiece can be loaded and unloaded safely and easily using the workpiece suspension platform. it can.

  A specific embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a stacker crane type transport traveling body that can reciprocate along a horizontal linear work transport path 2. As shown in FIGS. 2 and 4, it engages with the lower carriage 4 supported by the supporting guide rail 3 laid on the floor and the steady guide rail 5 laid on the ceiling side. The upper frame 7 provided with the roller unit 6 is connected and integrated with a pair of front and rear support members 8, and a workpiece transfer means 10 is provided on an elevating carriage 9 that moves up and down between the pair of front and rear support members 8.

  The workpiece transfer means 10 is composed of a pair of left and right running forks 11 that can move in and out in both left and right directions in synchronization with each other. The running forks 11 include a fixed rail portion 12 fixed to the lower side of the elevating carriage 9, an intermediate fork portion 13 that is movable with respect to the fixed rail portion 12, and an intermediate fork portion 13 that protrudes from the intermediate fork portion 13. When the intermediate fork portion 13 is moved back and forth with respect to the fixed rail portion 12 by a conventionally known exit / retreat driving means, the final fork portion 14 becomes the intermediate fork portion 13. The final fork 14 is moved in the same direction with respect to the home position positioned at the lower center position of the lifting / lowering carriage 9 and the advancing limit positioned away from the lateral side of the lifting / lowering carriage 9. You can move to and from the position. Although the running fork 11 having one intermediate fork portion 13 is shown in the drawing, a plurality of intermediate fork portions 13 are formed in order to increase the lateral advance distance of the final stage fork portion 14 with respect to the lifting carriage 9. It is also possible to employ a running fork 11 having

  As shown in FIGS. 2 to 4, the workpiece W handled by the workpiece transfer means 10 is suspended on a workpiece suspension base 15 via an appropriate hanging tool 16. The work suspension base 15 is provided on the inner side of the pair of left and right first supported portions 17a and 17b provided so as to project outward on the left and right sides on both upper sides of the left and right ends. A pair of left and right second supported portions 18a and 18b is provided, and the second supported portions 18a and 18b are detachable from the final stage fork portion 14 of the pair of left and right running forks 11 in the workpiece transfer means 10. It is comprised so that it can engage.

  As shown in FIG. 1, on one side of a work transport path 2 on which the transport traveling body 1 travels, a first work unloading booth 19, a second work unloading booth 20, a painting booth 21, a pretreatment booth 22, a water wash The booth 23, the first heat treatment device 24, and the second heat treatment device 25 are arranged in this order, and a work temporary storage shelf 26 is erected over the entire area of the work transfer path 2 on the other side of the work transfer path 2. ing. The work temporary storage shelf 26 includes a large number of work storage spaces 26a that are partitioned in both the horizontal direction and the vertical direction along the work transfer path 2, and is provided above each work storage space 26a. A pair of left and right support rail members 27a and 27b on which the first supported portions 17a and 17b of the work suspension base 15 can be placed are installed.

  The first work unloading booth 19 and the second work unloading booth 20 have the same structure, and as shown in FIGS. 5 to 7, the work suspension platform 15 is orthogonal to the work transfer path 2 in these booths. Conveying means 28 for moving in the horizontal direction is provided. The conveying means 28 is composed of a pair of left and right chain conveyors 29a and 29b on which the pair of left and right first supported portions 17a and 17b of the work suspension base 15 can be placed. These chain conveyors 29a and 29b are supported by left and right side frames 30 standing in the booths 19 and 20, and are synchronously driven by motors 31a and 31b.

  As shown in FIGS. 8 and 9, the coating booth 21 is closed, which can open and close the side facing the workpiece transfer path 2 by an opening / closing shutter 32 and has an operator door 33 provided with an opening / closing door 33a. A conveying means 34 having the same structure as the conveying means 28 installed in the first work loading / unloading booth 19 and the second work loading / unloading booth 20 is provided.

  The pretreatment booth 22 and the flush booth 23 have the same structure, and as shown in FIGS. 10 and 11, the side facing the workpiece transfer path 2 can be opened and closed by an opening / closing shutter 35 and provided with an opening / closing door 36a. Conveying means 37 having the same structure as the conveying means 28 installed in the first work unloading booth 19 and the second work unloading booth 20 is formed in a closed space having an entrance / exit 36 for the worker. And a nozzle-equipped pipe 38 for injecting a pretreatment liquid and cleaning water to the workpiece W.

  The first heat treatment device 24 and the second heat treatment device 25 have the same structure, and as shown in FIGS. 12 to 15, a two-story structure comprising a lower work relay booth 39 and a heat treatment furnace 40 provided thereon. It is. The work relay booth 39 is composed of a partitioned space having a pit-like floor surface that is open on the workpiece transfer path 2 side and lower than the floor surface of the work transfer path 2. A movable base 43 supported on a guide rail 41 laid on the surface via wheels 42 and reciprocating in a direction orthogonal to the path direction of the work transfer path 2, and an elevating drive means 44 on the movable base 43. And a work support 45 supported by the support. The raising / lowering drive means 44 is a well-known one comprising a cross link mechanism 46 for raising and lowering the work support base 45 in a horizontal posture with respect to the movable base 43 and a cylinder unit 47 for driving the cross link mechanism 46 up and down. Although illustrated, of course, it is not limited to this. As travel driving means for reciprocating the movable table 43, although not shown, the movable table 43 is pushed by a cylinder unit interposed between the floor side and a train system that rotationally drives the wheels 42. Any system such as a pulling drive system, a rack-and-pinion gear system that reciprocally moves the movable base 43 by rotating the pinion gear using the rack gear (or pinion gear) on the floor side and the pinion gear (or rack gear) on the movable base 43 side. But it ’s okay.

  A pair of support rail members 48b for supporting the pair of left and right first supported portions 17a and 17b of the work suspension base 15 for suspending the work W are installed on the left and right side frames 48a on the upper side of the work support base 45. The workpiece support means 49 is provided, and the workpiece W supported on the workpiece support base 45 via the workpiece suspension base 15 is suspended upward from the workpiece support base 45. . The left and right side frames 48a are connected by the connecting frame 48c at a position that does not interfere with the work suspension base 15 and the work W suspended by the work suspension base 15 when the work suspension base 15 is transferred from the work transfer path 2 side. They are connected and integrated with each other.

  The heat treatment furnace 40 has a lower open structure having an opening 51 in the floor 50, and the floor 50 is provided with a horizontally long hot air supply port 52 that opens on the side surface of the opening 51. A horizontally long exhaust port 53 for collecting hot air from the upper part of the furnace 40 is provided, and a heating means 55 and a hot air circulation blower 56 are interposed in a hot air circulation path 54 extending from the exhaust port 53 to the hot air supply port 52. A controller 57 for controlling the heating means 55 and the hot air circulating blower 56 is provided. The opening 51 of the heat treatment hearth 50 is of a size that allows the workpiece support 45 to be lifted up and down without difficulty.

  When the workpiece support 45 is lifted by the lift drive means 44, the movable table 43 is inserted into the opening 51 of the heat treatment hearth 50 as shown in FIG. 51, and the workpiece transfer means 10 of the transport traveling body 1 is suspended from the workpiece support means 49 (support rail member 48b) on the workpiece support base 45 as shown in FIG. It is configured to be able to reciprocate on the guide rail 41 with respect to the second position P2 at which the lowering base 15 can be loaded and unloaded, and the lifting and lowering drive means 44 of the work supporting base 45 supports the work as shown in FIG. The platform 45 descends into the workpiece relay booth 39 from the opening 51 of the heat treatment furnace floor 50 and travels for conveyance to the workpiece support means 49 (support rail member 48b) on the workpiece support platform 45. The lower limit position for transferring the workpiece at which the one workpiece transfer means 10 can load and unload the workpiece suspension platform 15, and the workpiece support 45 enters the opening 51 of the heat treatment furnace floor portion 50. The workpiece support 45 is moved with respect to the movable platform 43 with respect to the ascending limit position where the workpiece W supported by the workpiece support means 49 on the workpiece support 45 via the workpiece suspension platform 15 enters the heat treatment furnace 40. It moves up and down.

  Thus, as shown in FIG. 14, the work support 45 is inserted into the opening 51 of the heat treatment furnace floor 50 and closed when the opening 51 is closed. A duct space 58 that communicates with the hot air supply port 52 on the 40 side is provided inside, and a hot air ejection floor plate portion 59 that includes a large number of openings that communicate with the duct space 58 and eject hot air upward is provided.

  As shown in FIGS. 1 and 12, a plurality of specific work storage spaces 26a located directly opposite the first heat treatment apparatus 24 and the second heat treatment apparatus 25 in the work storage space 26a of the work temporary storage shelf 26 are cooled. The work storage space 26a is used as a work cooling booth 61 by disposing the air injection nozzle pipe 60 at a position that does not interfere with the work W to be stored and stored and the work suspension base 15 for hanging the work W. . A blower 62 supplies cooling air to the cooling air injection nozzle pipe 60. Any means for supplying cooling air into the work cooling booth 61 may be used. For example, an appropriate position around the work storage space 26a used as the work cooling booth 61, for example, a position that does not interfere with the work W and the work suspension base 15 that suspends the work W in the middle of the two work storage spaces 26a adjacent to each other vertically. In addition, the work cooling booth 61 can be configured with a simple configuration in which a fan that discharges air toward the upper (or lower) work storage space 26a is provided. Of course, the number and arrangement of the work storage spaces 26a used as the work cooling booth 61 are not limited to the illustrated example. For example, when the work cooling booth 61 is configured by disposing a fan that discharges air upward at the bottom of the work storage space 26a, the first heat treatment apparatus 24 and the second heat treatment apparatus 25 are directly opposite in plan view (FIG. 1). And the second work storage space 26a that is in the second step from the bottom in the side view (FIG. 12) and that is parallel to the traveling direction of the transport traveling body 1 is used as the work cooling booth 61. Can do.

  The use method of the coating line configured as described above will be described. When the work suspension rack 15 is unloaded from the work storage space 26a to be loaded and unloaded in the work temporary storage shelf 26 to the traveling body 1 for conveyance. Stops the transport traveling body 1 at a position facing the work storage space 26a to be unloaded, lifts the lifting carriage 9 and moves the workpiece transfer means 10 (running fork 11) to the work storage space to be unloaded. Stop at the delivery level for 26a. In this state, by moving the running fork 11 to the advance limit position, the final stage fork portion 14 is suspended by the support rail members 27a and 27b in the work storage space 26a. The workpiece suspension base supported by the final-stage fork portion 14 by being inserted into the two supported portions 18a and 18b and then being lifted by a predetermined height of the lifting carriage 9 and being pulled into the home position of the running fork 11 15 may be pulled in from the work storage space 26a to the lifting carriage 9 side while being slightly lifted from the support rail members 27a and 27b in the work storage space 26a. On the other hand, when the work suspending mount 15 is moved into the work storage space 26a from the transporting traveling body 1 side, the transporting traveling body 1 is stopped at a position facing the work storage space 26a to be stored. Then, the lifting carriage 9 is moved up and down to stop the workpiece transfer means 10 (running fork 11) at the loading level with respect to the workpiece storage space 26a to be loaded. In this state, the running fork 11 that suspends the work suspension base 15 at the final stage fork portion 14 inserted into the second supported parts 18a and 18b of the work suspension base 15 is moved from the home position to the advance limit position. Then, the first supported portions 17a and 17b of the work suspension base 15 are moved to a work storage space by lowering the lifting carriage 9 by a predetermined height and pulling the running fork 11 into the home position. What is necessary is just to mount on the support rail members 27a and 27b in 26a.

  In addition, the work suspension between any one of the first work loading / unloading booths 19 and 20, the painting booth 21, the pretreatment booth 22, the water washing booth 23, the first heat treatment device 24, and the second heat treatment device 25 and the transport traveling body 1. Transfer of the lowering pedestal 15 also requires the above-described loading / unloading operation only when the advancing direction of the running fork 11 with respect to the lifting carriage 9 on the transport traveling body 1 side is opposite to the side where the work temporary storage shelf 26 is located. This is performed in the same manner as the transfer of the work suspension base 15 between the target work storage space 26a and the traveling body 1 for conveyance. As shown in FIG. 4, the advancing limit position when the running fork 11 moves in the left and right directions, that is, the work hanging platform loading / unloading positions XR and XL as viewed from the transport traveling body 1 are on the left or right side. Even when advancing, it is a position that is the same fixed distance away from the center of the transporting traveling body 1 (the center position in the width direction of the work transporting path 2), and the work suspension loading / unloading position on the work temporary storage shelf 26 side. XR is substantially the center position in the depth direction in the work storage space 26a.

  Hereinafter, the method of using the coating equipment having the above-described configuration will be described in detail. In order to perform the work of suspending the workpiece W on the workpiece suspension base 15, the first workpiece in which the empty workpiece suspension base 15 is empty is used. The unloading booth 19 or the second workpiece unloading booth 20 is prepared. That is, when the empty work suspension base 15 is stored and stored using the specific work storage space 26 a of the temporary work storage shelf 26, the empty work suspension 1 is used to transfer the empty work suspension 1. The work platform 15 is delivered to the first work unloading booth 19 or the second work unloading booth 20, and the work suspension platform 15 left empty in the first work unloading booth 19 or the second work unloading booth 20 is provided. In some cases, the empty work suspension base 15 can be used.

  For example, the empty work suspension platform 15 delivered in the first work unloading booth 19 by the transport traveling body 1 is, as shown in FIG. 5, the work suspension mount unloading position XL as viewed from the transport traveling body 1. Then, the first supported parts 17a and 17b are lowered to be placed on the chain conveyors 29a and 29b of the conveying means 28. Therefore, the chain conveyors 29a and 29b are operated and the platform hanging position for lifting the workpiece XL The empty work suspension platform 15 is unloaded at the first work piece and conveyed in a direction away from the work conveyance path 2 to the work position Y1 which is substantially the center in the depth direction of the booth 19. As a result, the work W can be easily suspended from the empty work suspension base 15 using the wide space around the entire empty work suspension base 15. The work suspension base 15 from which the work W is suspended is transported to the workpiece suspension base unloading position XL of the original transport traveling body 1 by operating the chain conveyors 29a and 29b in the opposite direction again. .

  For example, if the workpiece W suspended on the workpiece suspension platform 15 (hereinafter simply referred to as workpiece W) is prepared at the workpiece suspension platform unloading position XL of the first workpiece unloading booth 19 as described above, This is transported to the pretreatment booth 22 by the transport traveling body 1. If the work W does not require degreasing and cleaning with the degreasing chemical solution in the pretreatment booth 22 and only requires water washing, the work W is transported to the water washing booth 23. When the workpiece W is carried into the pretreatment booth 22 or the washing booth 23, the opening / closing shutter 35 shown in FIGS. 10 and 11 is opened, and the chain conveyors 29a and 29b of the conveying means 37 provided in the pretreatment booth 22 and the washing booth 23 are opened. In a state where the first supported portions 17a and 17b of the work suspension base 15 are placed thereon, the work W is lowered at the work suspension base unloading position XL as viewed from the transport traveling body 1. After this (after the running fork 11 is pulled into the home position), the open / close shutter 35 is closed and the chain conveyors 29a and 29b are operated so that the workpiece suspension platform 15 in the workpiece suspension platform loading / unloading position XL is removed. The pretreatment booth 22 or the washing booth 23 is transported in the direction away from the work transport path 2 to the work position Y2 which is substantially the center in the depth direction. As a result, the workpiece W suspended on the workpiece suspension base 15 suitably corresponds to the nozzle-equipped piping 38 included in the pretreatment booth 22 or the flush booth 23. A treatment liquid (degreasing chemical solution) or washing water can be supplied, and the desired pretreatment or washing with respect to the workpiece W can be suitably performed.

  The workpiece W that has been pre-treated in the pre-treatment booth 22 or rinsed in the water washing booth 23 is operated again in the reverse direction by moving the chain conveyors 29a and 29b in the reverse direction, and is viewed from the original transporting traveling body 1 from the work position Y2. Then, the workpiece is transferred to the loading / unloading position XL for lifting the workpiece, and after opening the opening / closing shutter 35, the workpiece is taken out by the transfer traveling body 1 and transferred to the next booth. That is, the work W that has been pretreated in the pretreatment booth 22 is transported to the washing booth 23 and washed with water, and the work W that has been washed in the washing booth 23 is divided into the first heat treatment device 24 and the second heat treatment device. 25, it can be carried into, for example, the first heat treatment device 24 in an empty state and drained and dried.

  The first heat treatment apparatus 24 will be described as an example. In the first heat treatment apparatus 24 into which the workpiece W is loaded, the movable platform 43 of the workpiece relay booth 39 is moved by a lifting / lowering drive means 44 as shown in FIG. Is moved to the second position P2 where the work suspension platform 15 can be loaded and unloaded, and is kept waiting. At this time, the opening 51 of the heat treatment furnace floor 50 is in an open state, but the heating means 55 and the hot air circulation blower 56 are operated as appropriate so that the exhaust port passes through the heat treatment furnace 40 from the hot air supply port 52. It is possible to form a flow of hot air reaching 53 and keep the atmosphere in the heat treatment furnace 40 at a predetermined standby temperature.

  Thus, the work W taken out from the washing booth 23 by the transport traveling body 1 is waiting at the second position P2 in the work relay booth 39 of the first heat treatment apparatus 24 by the transport traveling body 1. The first supported portions 17a and 17b of the work suspension base 15 that suspends the work W are attached to the work support means 49 on the work support base 45 that is on the movable base 43 and in the lower limit position. In the state of being placed on the support rail member 48b of the support means 49, as shown in FIG. 12, it can be transferred at the work suspension platform unloading position XL as viewed from the transport traveling body 1. Next, as shown in FIG. 14, the movable table 43 is moved from the second position P2 to the first position P1, and then the lifting / lowering drive means 44 on the movable table 43 is operated to move the work support table 45 to the upper limit position. To rise. As a result, the work support base 45 enters the opening 51 of the heat treatment furnace floor 50, the work support base 45 is closed at the opening 51, and the work support means 49 on the work support base 45 is moved to the work support means 49. The work W in a state of being suspended through the suspension base 15 is inserted into the heat treatment furnace 40.

  When the workpiece W is inserted into the heat treatment furnace 40, the heating means 55 and the hot air circulation blower 56 are automatically operated according to a draining and drying program set in advance by the controller 57, and are sent from the hot air supply port 52. The heat treatment furnace 40 is formed so as to face upward from the hot air spray floor plate portion 59 of the work support base 45, which is a portion corresponding to the bottom face of the heat treatment furnace 40, through the hot air having a temperature and a predetermined air flow through the duct space 58 in the work support base 45. The hot air flowing into the exhaust port 53 is formed in the heat treatment furnace 40 for a predetermined time so that the work W suspended in the air in the heat treatment furnace 40 is drained and dried. be able to.

  In the illustrated embodiment, as shown in FIG. 12, the work carrier means 49 on the movable table 43 at the second position P <b> 2 and the workpiece support unit 45 on the workpiece support table 45 at the descending limit position are moved from the traveling body 1 for conveyance. The transferred work suspension base 15 (work W) is configured to be shifted to the work transport path 2 side with respect to the center line of the movable base 43 (work support base 45). Therefore, in this embodiment, as shown in FIG. 14, the movable table 43 is placed so that the workpiece W loaded into the heat treatment furnace 40 by the ascent of the work support table 45 is positioned at the approximate center in the heat treatment furnace 40. The first position P <b> 1 is set so as to be shifted to the far side from the workpiece transfer path 2 with respect to the center line of the heat treatment furnace 40.

  When draining and drying for a predetermined time is completed, the work support base 45 is lowered to the lower limit position so that the work W escapes from the heat treatment furnace 40 to the lower work relay booth 39 through the opening 51 and the movable base 43 is moved to the first position. For suspending a workpiece as viewed from the transporting traveling body 1, the workpiece W (work suspension platform 15) supported by the workpiece support means 49 on the workpiece support platform 45 is moved from the first position P1 to the second position P2. By returning to the gantry loading / unloading position XL, the drained and dried work W can be received by the transport traveling body 1 and transported to the coating booth 21 for coating in the next step.

  Also in the painting booth 21, as shown in FIGS. 8 and 9, the workpiece W is placed on the chain conveyors 29 a and 29 b of the conveying means 34 on the first conveyor of the workpiece suspension base 15 with the opening / closing shutter 32 opened. When the support portions 17a and 17b are placed, the workpiece hanging platform loading / unloading position XL as viewed from the transport traveling body 1 is lowered. Thereafter (after the running fork 11 is pulled into the home position), the open / close shutter 32 is closed, and the chain conveyors 29a and 29b are operated so that the workpiece suspension platform 15 at the workpiece suspension platform loading / unloading position XL is removed. The paint booth 21 is transported in a direction away from the work transport path 2 to a work position Y3 that is substantially in the center in the depth direction. As a result, since the workpiece W is suspended at a substantially central position of the painting booth 21, a sufficient work space is secured around the workpiece W. For example, even in a manual painting operation using a spray gun, The painting operation can be performed easily and satisfactorily.

  The finished work W is transported again from the work position Y3 to the work suspension platform loading / unloading position XL as viewed from the original transporting body 1 by operating the chain conveyors 29a and 29b in the opposite direction. After the shutter 32 is opened, it can be taken out by the transport traveling body 1 and transported to the booth in the next stage process. That is, the workpiece W that has been painted is carried into the empty first heat treatment device 24 of the first heat treatment device 24 and the second heat treatment device 25, for example, and coating film drying or coating film drying and baking are continuously performed. Processing can be performed. For the heat treatment, the work W is transported by the transporting traveling body 1 and charged into the heat treatment furnace 40 of the first heat treatment apparatus 24 or the second heat treatment apparatus 25 and the heat-treated work W is transported by the transporting traveling body 1. The procedure of receiving is the same as the procedure at the time of carrying out the draining and drying process described above, and thus the description thereof is omitted. The heat treatment in the heat treatment furnace 40 is performed by selecting and executing a target heat treatment program from a coating film drying program and a coating film drying baking process continuous program set in advance in the controller 57, and thereby for heating means 55 and hot air circulation. The blower 56 is automatically operated, and a desired heat treatment is performed.

  In addition, the workpiece | work W in which the coating completed and the coating-film drying process by the coating-film drying program in the 1st heat processing apparatus 24 or the 2nd heat processing apparatus 25 were complete | finished are the empty work storage space of the workpiece | work temporary storage shelf 26. After moving to 26a and leaving it for a required time, it is sent to the first heat treatment apparatus 24 or the second heat treatment apparatus 25, and only the baking process is performed on the workpiece W by selecting and executing the baking process program set in the controller 57. It is also possible.

  The workpiece W that has been heat-treated can be stored in the vacant workpiece storage space 26a in the workpiece temporary storage shelf 26 by the transporting traveling body 1 and naturally cooled, but when forced cooling is required, The workpiece W is housed in a workpiece storage space 26a serving as a workpiece cooling booth 61 located opposite to the first heat treatment apparatus 24 or the second heat treatment apparatus 25, and a blower 62 connected to the workpiece cooling booth 61 is operated for cooling. The work W stored in the work cooling booth 61 can be forcibly cooled by jetting cooling air from the air jet nozzle pipe 60. At this time, since the work storage space 26a as the work cooling booth 61 is disposed at a position opposite to the first heat treatment apparatus 24 and the second heat treatment apparatus 25, the heat treatment can be efficiently performed without causing the transport traveling body 1 to travel almost. The finished work W can be transferred to the work storage space 26a as the work cooling booth 61. In particular, as in the work cooling booth 61 illustrated by phantom lines in FIG. 1, the center position in the plan view is directly opposite to the first heat treatment device 24 and the second heat treatment device 25. If the work cooling booth 61 is arranged so as to coincide with each of the second heat treatment devices 25, the work W after the heat treatment can be transferred to the work cooling booth 61 without running the transporting traveling body 1 at all. . Further, as shown in FIG. 12, the workpiece suspension platform 15 is lifted and retracted by the running fork 11 of the transport traveling body 1 directly opposite to the workpiece relay booth 39 of the first heat treatment device 24 and the second heat treatment device 25. It is also possible to provide a work storage space 26a as a work cooling booth 61 in which the heat-treated work W can be transferred only by a series of operations of sending and lowering to the opposite side.

  The workpiece W stored and stored in the workpiece temporary storage shelf 26 after the cooling time has passed is delivered to the first workpiece loading / unloading booth 19 or the second workpiece loading / unloading booth 20 by the transporting traveling body 1, and these workpiece loading / unloading booth 19. , 20, the workpiece W can be removed from the workpiece suspension base 15 moved to the work position Y1 and carried out.

  In the illustrated embodiment, it has been described that an operator enters the painting booth 21 and performs the painting operation manually. However, a painting robot or the like is provided in the painting booth 21 so that painting is performed automatically. It can also be configured to be performed. In this case, the work loading / unloading booths 19 and 20, the pretreatment booth 22, the water washing booth 23, the painting booth 21, and the heat treatment devices 24 and 25 can be arranged in this order in parallel. When an operator enters the facility 21 to perform painting work manually, the work loading / unloading booths 19 and 20, the painting booth 21, the washing booth 23, the pretreatment booth 22, and the heat treatment devices 24 and 25 are used. The booths in which the workers are involved can be arranged adjacently in order to facilitate linkage between the workers, and the length of the transport path of the workpiece W when the pretreatment process is unnecessary can be shortened.

The present invention described in claim 1 can be implemented and used as described above. However, the embodiment is not limited to the above, and various embodiments are within the technical scope of claim 1. Can be adopted. Some examples:
1) Since the work support base and the heat treatment furnace located above it may be moved up and down relatively, the work on the work support base can be moved up and down without raising or lowering the work support base. It can be put in and out of the heat treatment furnace.
2) A heat treatment furnace that is configured to be movable on the workpiece transfer path by, for example, installing the workpiece support on a slat conveyor and is waiting at an upper standby position with respect to the workpiece support that has stopped at a fixed position. It can be configured such that the workpiece supported on the workpiece support is lowered and is relatively loaded into the heat treatment furnace.
3) The position of the work support table when the work support table and the heat treatment furnace located above the work support table are moved up and down relatively and the work on the work support table is loaded into the heat treatment furnace is as follows. It may be outside the furnace below the opening, or may be a position entering the furnace. Even when the work support is configured to stop in a state where the work support is in the opening of the heat treatment furnace floor, the work support is not of a size that substantially closes the opening of the heat treatment furnace floor. Good.
4) In the above embodiment, the heat treatment apparatus of the present invention is incorporated in the painting line, but only the heat treatment apparatus of the present invention can be independently installed and used.
5) A heat ray irradiation type such as an infrared lamp can be used as a heating means in the heat treatment furnace.

It is a schematic plan view of the whole coating line which shows one Embodiment of this invention. It is a side view of the traveling body for conveyance which conveys a workpiece | work. It is a front view which shows the storage storage state of the workpiece | work in a workpiece | work temporary storage shelf. It is a vertical front view explaining the workpiece transfer means of the traveling body for conveyance. It is a top view which shows a work loading / unloading booth. It is a rear view which shows the work loading / unloading booth. It is a vertical side view which shows the work loading / unloading booth and the traveling body for conveyance. It is a vertical side view which shows a coating booth and a traveling body for conveyance. It is a cross-sectional top view which shows the painting booth. It is a vertical side view which shows a pre-processing booth or a water washing booth, and a traveling body for conveyance. It is a cross-sectional top view which shows a pretreatment booth and a flush booth. It is a vertical side view which shows a heat processing apparatus, the traveling body for conveyance, and a workpiece | work cooling booth. It is a vertical front view which shows a heat processing apparatus. It is a vertical side view which shows the heat processing apparatus of the state in which the workpiece | work was inserted. It is a vertical front view which shows the heat processing apparatus in the state in which the workpiece | work was inserted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transfer traveling body 2 Work conveyance path 9 Lifting carriage 10 Work transfer means 11 Running fork 15 Work suspension bases 17a, 17b First supported parts 18a, 18b Second supported parts 19 First work loading / unloading booth 20 Two-work loading / unloading booth 21 Painting booth 22 Pretreatment booth 23 Flushing booth 24 First heat treatment device 25 Second heat treatment device 26 Work temporary storage shelves 28, 34, 37 Transport means 29a, 29b Chain conveyor 32, 35 Opening / closing shutter 39 Work relay booth 40 Heat treatment furnace 43 Movable stage 44 Elevating drive means 45 Work support base 46 Cross link mechanism 47 Cylinder unit 48b Support rail member 49 Work support means 51 Opening 52 Hot air supply port 53 Exhaust port 54 Hot air circulation path 55 Heating means 56 Hot air circulation Blower 57 Con Roller 58 duct space 59 hot air floor portion 60 for cooling air ejection nozzle pipe 61 workpiece cooling booth 62 Blower W workpiece (object to be coated)

Claims (7)

  A heat treatment furnace that is open on the lower side, a heating means in the heat treatment furnace, a work support table that can be positioned immediately below the heat treatment furnace, and the heat treatment furnace and the work support table are moved up and down relative to each other on the work support table. The heat processing apparatus comprised from the raising / lowering drive means which withdraws / inserts the workpiece | work supported by the up-down direction with respect to the heat processing furnace.   A workpiece transfer base is provided on the side of the workpiece transfer path, and the workpiece is transferred to and from the workpiece support table on a transfer traveling body that travels along the workpiece transfer path and can be stopped at a lateral position of the workpiece support table. The heat treatment apparatus according to claim 1, wherein means are provided.   A workpiece support shelf is provided on the opposite side of the workpiece conveyance path to the workpiece support platform, and the workpiece transfer means of the conveyance traveling body can be moved back and forth on either the workpiece support platform side or the workpiece support shelf side. The workpiece is configured so that the workpiece can be transferred even between the workpiece support shelves, and the heat-treated workpiece taken out from the workpiece support table can be transferred to the workpiece support shelf and cooled. 2. The heat treatment apparatus according to 2.   The heat treatment furnace is fixed in position, and the lifting drive means moves the workpiece support table up and down between the lower limit position for transferring the workpiece directly below the heat treatment furnace and the upper limit position where the workpiece on the workpiece support table enters the heat treatment furnace. The heat processing apparatus of any one of Claims 1-3 comprised so that it might move.   The work support base is mounted on a movable base movable on the lower floor of the heat treatment furnace, and the movable base heat-treats the work supported by the work support base by the relative up-and-down movement of the heat treatment furnace and the work support base. 5. The apparatus according to claim 1, wherein the reciprocating movement is configured between a first position at which the work can be loaded into the furnace and a second position for loading and unloading the work with respect to the work support. The heat processing apparatus as described in.   When the workpiece supported on the workpiece support table is loaded into the heat treatment furnace by moving the heat treatment furnace and the workpiece support table relatively up and down, the workpiece support table is positioned in the lower open part of the heat treatment furnace. The heat processing apparatus of any one of Claims 1-5 comprised.   The work is suspended from a work suspension base having supported parts on both sides, and the work support base is provided with a pair of support rail members that support both side supported parts of the work suspension base. The heat processing apparatus of any one of Claims 1-6 comprised so that the workpiece | work supported on the workpiece support stand via the work stand could be suspended away from the said workpiece support stand.

Images