CN218339928U - Permanent magnet motor direct-drive vertical mill with bidirectional load buffer device - Google Patents

Abstract

The utility model discloses a permanent magnet motor directly drives vertical mill with two-way load buffer, including vertical mill, vertical mill driving system, two-way load buffer, braced frame and base, driving system includes rotor mechanism and annular stator mechanism, rotor mechanism cover is located in the annular stator mechanism, annular stator mechanism drive rotor mechanism rotates, the mill is located above the rotor mechanism, the rotary drum is connected with the mill of vertical mill, annular stator structure mainly comprises three-dimensional shell, motor winding and base, the base is used for supporting stator structure and fixed bearing, two-way load buffer sets up the circumference position at stator structure's up end or mill lower terminal surface, two-way load buffer is made up by sector module and pieces together into circular ring type structure; the bidirectional load buffer device can ensure the relative sliding of the stator structure and the rotor structure and can also bear the radial and axial bidirectional bearing force from the permanent-magnet direct-drive vertical mill.

Description

Permanent magnet motor direct-drive vertical mill with bidirectional load buffer device

Technical Field

The invention relates to the technical field of vertical mills, in particular to a permanent magnet motor direct-drive vertical mill with a bidirectional load buffer device.

Background

The vertical mill is a key device for grinding materials into powder after the materials are crushed, and the vertical mill is an advanced grinding device which is designed and developed by combining production experiences of various mills, flour mills and ball mills for many years on the basis of widely adopting domestic and foreign advanced technologies; the grinding mill is ideal equipment for the grinding industry integrating crushing, drying, grinding and grading conveying. Can be widely applied to the industries of cement, electric power, metallurgy, chemical industry, non-metallic ore and the like. Is used for grinding the blocky, granular and powdery raw materials into the required powdery material. The vertical mill developed before the last 60 years has imperfect structure, wear-resistant parts, long service life and mainly depends on a ball mill, and can only mill soft coal. In the last 70 th century, with the rapid development and continuous scale expansion of novel dry-process cement technology, the energy-saving requirement is improved, so that the vertical mill technology is continuously improved and perfected. Various technical indexes of the vertical mill are improved to a certain extent, and meanwhile, the operation and maintenance cost is also reduced, so that the one-time investment is also greatly reduced.

Most of the existing vertical mills are roller mills, although the structures of the existing vertical mills have certain differences, the materials are ground by applying a material bed grinding principle, a grinding roller is driven to rotate by the rotation of a grinding disc, the materials move to the edge of the grinding disc under the action of centrifugal force and are meshed into the roller discs for grinding, the linear speeds of the roller discs are consistent only at standard diameters, and the shearing is formed by the speed difference of other parts. The foundation comprises a host machine base, a speed reducer base, a motor base, a foundation bolt box, a lower support of a tensioning device and the like; the transmission device comprises a main asynchronous motor, a main speed reducer and the like; the roller disc structure, the main components are roller and disc; the pressure device is used for pressing the vertical mill by a spring and by hydraulic pressure; the transmission structure of the asynchronous motor, the speed reducer and the gear pair has the advantages of large volume, large installation occupied area, large noise during operation, low mechanical efficiency, high energy consumption, low energy utilization rate and the like. Meanwhile, the edge-driven open gear is positioned in a gear cover which is difficult to be strictly sealed, good lubrication is difficult to maintain, an exposed gear pair needs to be continuously oiled and lubricated, pollution is easy to occur, abrasion is severe after dust invasion, the service life of the gear pair is short, edge-driven parts are scattered, an oil supply point and a check point are large, and operation, inspection and maintenance are difficult. In particular, the power loss of the electric machine is necessarily increased during starting and operation by overcoming the relatively high friction of the plain bearing.

In order to solve the defects of low transmission efficiency and related defects, in recent years, a plurality of patents propose the efficiency problem of improving the vertical mill, and the traditional mechanical transmission thought is removed and the permanent magnet synchronous motor which is mature day by day is used for directly driving in the Chinese patent with the patent application number of 201110038911.X, the patent application number of electrical direct transmission technology of high-power low-rotating-speed mechanical equipment, the patent application number of 201210219250.5, the patent application number of combined stator and rotor permanent magnet motor direct-driven vertical mill millstone and the patent application number of 201821535752.8. In the existing permanent-magnet direct-drive vertical mill bearing lubricating system, a limit bearing at the lower end of a rotor, a centering bearing and a thrust bearing at the upper end of the rotor are arranged, and the diameter of a mill is large, so that the diameter of the centering bearing and the diameter of the thrust bearing are also large, the manufacturing and maintenance cost of the bearing is high, inconvenience is brought due to the large size of the mill and the bearing during installation and maintenance, the requirement in actual use cannot be met, and therefore the technology capable of being improved is urgently needed in the market to solve the problems.

Disclosure of Invention

The invention aims to overcome the existing defects and provides a permanent magnet motor direct-drive vertical mill with a bidirectional load buffer device, which is convenient to manufacture, assemble, maintain and disassemble, is assembled at the maximum peripheral position, can maximize the bidirectional bearing force, greatly reduces the manufacturing and maintaining cost and can effectively solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a permanent magnet motor direct-drive vertical mill with a bidirectional load buffering device comprises a vertical mill, a vertical mill power system, the bidirectional load buffering device and a base, wherein the power system comprises a rotor mechanism and an annular stator mechanism, the rotor mechanism is sleeved in the annular stator mechanism, the annular stator mechanism drives the rotor mechanism to rotate, the rotary drum is sleeved in the rotor mechanism, the rotor mechanism drives the rotary drum to rotate, the rotary drum is connected with a grinding disc on the vertical mill, a feed inlet and a discharge outlet are formed in a cylinder body of the vertical mill, a vertical roller is fixed on a supporting frame on the grinding disc, a positioning bearing is arranged at the lower end of a central shaft of the rotor mechanism, a motor shell is arranged outside the annular stator mechanism, the base is arranged at the lower end center of the motor shell, the positioning bearing is arranged on the base, an oil groove is formed in the upper end face of the annular stator mechanism, the bidirectional load buffering device is immersed in the oil groove, the bidirectional load buffering device comprises a fan-shaped module, the fan-shaped module is hung and hung below the grinding disc through an I-shaped fastener, the oil groove is fixedly connected with the upper end face of the annular stator mechanism, the oil groove is arranged in the contact face of the oil groove, and the load buffering device, and the mirror plate is fixed on the lower side of the annular stator mechanism.

Furthermore, the power system of the vertical mill is provided by a permanent magnet synchronous motor, adopts a modular design, can divide a stator and a rotor into blocks, and is convenient to manufacture, transport, install and maintain.

Further, when the number of the annular stator mechanisms is larger than 1, the stator mechanisms comprise a fan-shaped shell and a stator core in the fan-shaped shell, a stator winding wound with the core is arranged on the stator core, the fan-shaped shell and the fan-shaped shell are integrally spliced to form an annular structure, and a cushion block is arranged below the motor shell in a cushioning mode.

Furthermore, the device with the bidirectional load buffering function is composed of independent fan-shaped blocks, the arc surface of each fan-shaped module is concentric with the rotary drum, the fan-shaped modules are connected with the grinding disc along the circumference through I-shaped clamping pieces, the side surfaces and the bottom surface of each fan-shaped module are arranged into a bidirectional load bearing structure formed by combining a stainless steel semicircular pipe, a thrust bearing bush, a roller, a ball or a roller, and the bidirectional load buffering structure is immersed in an oil groove.

Furthermore, the stainless steel semicircular pipe can be divided into two parts by a stainless steel pipe to be used as a half-wall pipe to be welded on the fan-shaped modules, the number and the thickness of the stainless steel semicircular pipe welded on each fan-shaped module are related to the radial and axial bearing weight, the bearing weight is calculated to determine the thickness, and the thickness of the stainless steel semicircular pipe welded on each fan-shaped module is used after arc and plane grinding.

Furthermore, the roller be the cylinder, the ball is the spheroid, all adopts traditional bearing structure and protection system to make, opens corresponding big or small groove on fan-shaped module surface, fixes on fan-shaped module surface through welding or spiro union, the assembly bearing in the gyro wheel, the gyro wheel is fixed on the shaft tube that has the navigation key, has buffering dish spring on the shaft tube, fixes the shaft tube on fan-shaped module through the nut, the thrust axle bush adopts conventional thrust axle bush design, in order to reduce the large tracts of land friction of thrust axle bush to get up heat, increases dish spring structure and location axle between thrust axle bush and the fan-shaped module, obtains certain buffering under the basis of guaranteeing the location, reduces the friction, increases life.

Furthermore, the H-shaped clamping piece is an important part for connecting the bidirectional load buffering device and the grinding disc, grooves of the H-shaped clamping piece are formed in the grinding disc and the fan-shaped module together, and a small gap is reserved in the clamping groove to facilitate installation and disassembly of the fan-shaped module.

Furthermore, after the fan-shaped module and the grinding disc are installed together, a plurality of fixing screws are additionally arranged on the I-shaped clamping piece below the grinding disc to tightly fix the fan-shaped module.

Furthermore, the oil groove is of an annular structure, the contact surface of the oil groove and the bidirectional load buffer device is a mirror plate, the annular seamless mirror plate is made of wear-resistant materials such as stainless steel or bearing steel materials, an oil inlet and an oil outlet are formed in the side wall of the oil groove, and lubricating oil is filled into the oil groove before the grinding disc is hoisted.

Furthermore, other devices such as a rotary drum and a vertical roller of the vertical mill are arranged above the grinding disc according to the traditional vertical mill structure.

The structure adopted by each sliding rolling unit is to reduce the friction of a contact surface and buffer, support and balance the grinding disc through a buffer device, buffer and right the rotary drum, and the structure adopts a stainless steel semicircular tube structure, so that large-area surface contact friction can be converted into small-area friction, and meanwhile, the stainless steel semicircular tube can generate elastic deformation, and the structure is arranged below the sector module and can bear the pressure of the grinding disc and other devices above the sector module in the axial direction, so that the functions of buffering, supporting and balancing the grinding disc can be achieved, and the structure can be arranged on the side surface of the sector module and can play a role of buffering and righting the rotary drum.

Compared with the prior art, the invention has the beneficial effects that:

1. the permanent magnet direct-drive power system is adopted, after alternating current is introduced into the system, the magnetic field of the rotor mechanism is induced in the magnetic field of the annular stator mechanism, the rotor mechanism directly drives the rotary drum to rotate, the vertical mill grinding disc is directly driven by the low-speed high-torque permanent magnet synchronous motor, the integrated design of the motor and mechanical equipment is realized, the annular stator mechanism adopts a splicing type structure, the manufacturing and the transportation of a factory are facilitated, the field assembly and the subsequent maintenance are realized, the stator adopts a fan-shaped structure, the fault unit is conveniently replaced during the installation and the maintenance, the defects of the traditional mechanical transmission system that the transmission chain is long, and the size and the weight are large are fundamentally changed, and the permanent magnet direct-drive power system can be widely applied to the large vertical mill grinding disc technology.

2. Because of the excellent performance of the permanent magnet synchronous motor, the working condition requirement of low speed and large torque can be met, the rotor mechanism directly drives the movable grinding disc to rotate, a complicated transmission mechanism in the prior art is eliminated, no gear transmission consumption exists, and meanwhile, the equipment is more stable in operation.

3. Through setting up load buffering support piece, mill friction surface assembly mirror plate, the effect of cooperation lubricating oil, can effectual solution mill at the friction loss and the themogenesis problem of friction of rotation in-process, the energy of the amplitude that founds the mill production simultaneously, effectively offset the release by buffering support piece, reach the steady and high-efficient operation of founding the mill operation, the vibration problem of mill is found to traditional roll-type very generally, the reason of vibration mainly is that the material layer thickness between grinding roller and the mill is inhomogeneous, grinding pressure is unstable, cause and found the mill vibration. The bidirectional load buffering device is adopted, so that the friction problem can be well solved, in order to reduce friction loss during motor design, the vertical mill direct drive motor is designed to be a point that a magnetic force central line is deviated from a point when the motor is static, the magnetic force central line moves upwards a point when the motor is started and runs, the friction force between the load device and a mirror plate can be reduced through magnetic attraction, and the vibration problem of the vertical mill is also reduced. The traditional vertical mill has the advantages of single speed, poor working condition adaptability, meeting of emergency, change of the working environment of the system by adjusting the height of the grinding roller, slow system reaction, certain protection effect of the bidirectional load buffer device, large diameter of the mill, large diameter of the centering bearing and thrust bearing, high production and maintenance cost and complex installation and maintenance.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic sectional view of a motor driving part according to the present invention;

FIG. 3 is an enlarged schematic view of the structure at the position A;

FIG. 4 is a schematic view of an inverted structure of the bi-directional load cushion apparatus of the present invention;

FIG. 5 is a schematic view of a portion of a bi-directional load cushion apparatus of the present invention;

FIG. 6 is a schematic view of the assembly structure of the thrust bearing shell and the sector module according to the present invention;

FIG. 7 is a first combination view of a fan module of the load cushion apparatus of the present invention;

FIG. 8 is a second combination view of the fan-shaped modules of the load cushion of the present invention;

FIG. 9 is a third view of the fan-shaped module assembly of the load cushion of the present invention;

FIG. 10 is a fourth view of the load cushion sector assembly of the present invention;

FIG. 11 is a fifth combination view of the load cushion sector module of the present invention;

FIG. 12 is a sixth view of a load cushion sector assembly of the present invention;

FIG. 13 is a seventh combination view of the fan-shaped modules of the load cushion of the present invention;

FIG. 14 is an eighth view of a load cushion sector assembly in accordance with the present invention;

FIG. 15 is a ninth view of the load cushion sector module assembly of the present invention;

FIG. 16 is a cross-sectional view of a sector module assembly of the load cushion of the present invention;

FIG. 17 is an eleventh perspective view of a load cushion sector module in accordance with the present invention;

FIG. 18 is a twelve sectional view of a sector module of the load cushion of the present invention;

FIG. 19 is a thirteen combination view of the sector modules of the load cushion of the present invention;

FIG. 20 is a view showing a fourteen-segment combination of the load cushion apparatus of the present invention;

FIG. 21 is a combination view of a sector module of the load cushion assembly of the present invention as fifteen;

fig. 22 is a sixteen perspective view of the combination of the fan modules of the load cushion apparatus of the present invention.

In the figure: the grinding machine comprises a vertical grinding machine 1, an annular stator mechanism 2, a rotor mechanism 3, a grinding disc 4, an aluminum plate 5, a positioning bearing 6, a rotating drum 7, a base 8, a sector module 9, an I-shaped clamping piece 10, a stainless steel semicircular pipe 11, a roller 12, a ball 13, a roller 14, an oil groove 15, a disc spring 16, a thrust bearing bush 17, a mirror plate 18, a radial inner supporting surface 19, an axial support 20, an oil chamber outer seal 21, an oil surface line 22 and a fixing screw 23.

Detailed Description

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The invention is described in detail with reference to the accompanying drawings, which provide a technical solution: a permanent magnet motor direct-drive vertical mill with a bidirectional load buffer device is characterized in that a drive motor of a vertical mill 1 is of an annular vertical structure, a main transmission device of a mill disc of the vertical mill is directly driven by the permanent magnet motor, a fan-shaped rotor block and a stator core are sequentially installed from inside to outside along the radial direction, the stator core is fixed on a step of a base 8, a rotary drum 7 is connected with the base through a positioning bearing 6, the bidirectional load buffer device is in a modular design, is composed of fan-shaped modules 9 and is installed below the mill disc 4, and the mill disc is welded or screwed on the rotary drum.

The stator core of the annular stator mechanism 2 is assembled and molded by a sector module stator core, each stator core is screwed on the step of the base by a fastening bolt, and a cushion block is arranged under the base and screwed with the base. The stator winding can adopt a formed winding and is provided with a frequency converter for speed regulation starting operation, the rotor mechanism 3 is formed by splicing a plurality of rotor blocks, the rotor blocks are fixed on a rotor support through screws, a magnetic isolation aluminum plate 5 is arranged between the rotor support and the rotor blocks, permanent magnets are arranged between the adjacent rotor blocks, baffles are arranged at two ends of each permanent magnet, and the permanent magnets adopt a tangential structure with built-in rectangular blocks. The diameter of the annular stator mechanism is large and constant, the annular stator mechanism comprises a fan-shaped shell and a stator core in the fan-shaped shell, a stator winding wound by the core is arranged on the stator core, and the fan-shaped shell are integrally spliced into an annular structure. The grinding disc can also be spliced by half the diameter, and the grinding disc is spliced and screwed on the rotor structure after the grinding disc is used.

The bidirectional load buffer device is hoisted below the millstone along the circumference through the I-shaped clamping piece 10, and the I-shaped clamping piece is fixedly connected with the millstone through a plurality of screws after the installation and the positioning are finished, so that the bidirectional load buffer device is fastened, and the I-shaped clamping piece and the screws can be positioned in the radial direction and the axial direction. The fan-shaped module can be hoisted and fixed by screws on the hollowed-out millstone structure through plane conical nut holes on the module of the bidirectional load buffer device.

Set up annular oil groove 15 in the top of the motor housing of two-way buffer below, be provided with oil level line 22 in the oil groove, and it has oil inlet and oil-out to open, pour into lubricating oil toward the inslot, can reduce the coefficient of friction of two-way bearing buffer and runner plate 18, oil inlet and oil-out are opened at the lateral wall of oil groove, the oil tank that is equipped with lubricating oil is equipped with cooling device, through the oil pump with the lubricating oil after the cooling pour into the oil groove into by the oil inlet through oil pipe, rethread oil-out will lubricate in the oil flow case of lubricating oil, form one and can lubricate, oil circulating device that can cool off again, when specifically implementing, the size and the quantity of business turn over hydraulic fluid port are depending on motor size and concrete operating mode decision.

During assembly, after the rotor center screwed with the grinding disc is positioned, the assembly work of the rotor and the stator is completed from top to bottom.

Whole load buffer can also be reversed the assembly, the runner plate has just become special-shaped runner plate this moment, special-shaped runner plate spiro union is fixed at the mill downside, two-way load buffer spiro union is in the oil groove of stator up end, the oil groove can be in the same place with stator up end structural design, then pour into lubricating oil into in the oil groove, simultaneously for simple to operate, the periphery lateral wall of oil groove also can be designed into the board that can fix through set screw 23, and carry out grease chamber external seal 21 to the junction gap, prevent revealing of lubricating oil, the lateral surface of load buffering fan-shaped module has all been opened two circular apertures that run through to the medial surface, be convenient for install extension bar hoist and mount and dismantle the use.

The bidirectional load buffering device is hoisted by the fan-shaped module through the I-shaped clamping piece and spliced below the grinding disc along the circumference, the load buffering device is soaked in an oil groove on the upper end surface of the stator, the oil groove can be structurally designed together with the upper end surface of the stator, and the oil groove structure can also be independently designed to be in threaded connection with the stator structure. The mirror plate is secured in the oil sump at the interface with the load device, i.e., the oil sump bottom and side surfaces. The load buffer device can also be assembled on the stator structure in a reverse mode, the bidirectional load buffer device is screwed in an oil groove on the upper end face of the stator, the mirror plate can be designed into an L shape or an inverted U shape and fixed at the lower side of the grinding disc to extend into the oil groove, a radial inner supporting surface 19 is formed between the side face of the sector block and the mirror plate, the mirror plate can be designed into an L shape or an inverted U shape and fixed below the grinding disc, an axial support 20 is formed between the top face of the sector module and the mirror plate, the mirror plate in the oil groove can be subjected to babbitt gold plating treatment or other wear-resistant process forms, the bidirectional load buffer device can be used for facilitating installation and maintenance, and the friction loss of the mirror plate and the oil groove can be further reduced. In order to reduce friction loss in motor design, a vertical mill direct drive motor is designed to be a point below a magnetic force central line when the motor is static, and a point above a magnetic force center when the motor is started and runs.

The centralizing bearing and the thrust bearing at the upper end of the rotor are combined into the modularized bidirectional load buffer device, so that the bidirectional load buffer device is convenient to manufacture, assemble, maintain and disassemble, the assembly is at the maximum peripheral position, the bidirectional bearing force can be maximized, and the manufacturing and maintaining cost is greatly reduced.

A permanent magnet motor direct-drive vertical mill of a bidirectional load buffer device is characterized in that a bidirectional bearing part of a fan-shaped module can adopt a stainless steel semicircular pipe 11, a thrust bearing bush 17, a roller 12, a ball 13 and a roller group 14 to be designed in a combined mode, the stainless steel semicircular pipe can be divided into two parts by a stainless steel pipe to be used as a semi-wall pipe to be welded on the fan-shaped module, the thickness of the pipe is determined according to the calculation of a bearing weight, the thrust bearing bush adopts a conventional thrust bearing bush design, in order to reduce large-area friction heating of the thrust bearing bush, a disc spring 16 structure and a positioning shaft are additionally arranged between the thrust bearing bush and the fan-shaped module, certain buffering is obtained under the condition of ensuring positioning, friction is reduced, the service life is prolonged, the ball adopts an existing ball unit which is arranged on the module in various modes to bear the transmission of radial or axial force, the ball unit is provided with a flexible device to facilitate axial and circumferential positioning, the roller is manufactured by adopting a traditional bearing structure and a protection system, the roller device is provided with a radial roller and an axial roller which are combined together to bear bidirectional load, the axial force which is larger than the radial roller, the radial force of the radial roller, the radial roller is fixedly connected in the basic roller, and the roller in the roller of the roller, and the roller which is fixedly connected on the roller in the roller to bear the axial roller, and the axial roller to bear the axial roller, and the axial roller structure, and the axial roller to bear the axial force which can ensure the axial roller to bear the axial force which can bear the axial force, and can be balanced precision.

The radially arranged contact guide wheels, contact bodies or friction bodies can be arranged on the outer periphery or the inner periphery of the annular module, or on both the inner periphery and the outer periphery. The contact guide wheel, the contact body and the friction body are arranged in the radial direction and are in opposite contact with the mirror plate.

When the permanent magnet motor direct-drive vertical mill with the bidirectional load buffering device is used, if a load buffering fan-shaped module is damaged, the replacement and maintenance are also very convenient, the mill disc is firstly supported and fixed by a little distance by three or more jacks, then the motor shell is jacked upwards by a small distance by the same method, a cushion block padded below the motor shell is pulled away, then the motor shell can be dropped, the bidirectional load buffering device is exposed, it needs to be noted that the dropping height only needs to expose the bidirectional load buffering fan-shaped module, the peripheral rotor part of the rotary drum cannot be completely separated from the coil part of the stator core, the inconvenience brought by the magnetic force of a permanent magnet when the rotary drum is installed in a motor stator is avoided after the load fan-shaped module is replaced, after the bidirectional load buffering device is exposed, a fixing screw on the fan-shaped clamping piece which needs to be replaced is unscrewed, after the fan-shaped block naturally droops, a steel pipe is inserted into two small holes in the side wall of the fan-shaped module, the steel pipe is hung by a crane, the fan-shaped module is slowly pulled out, a lug can be installed in a manner that the mill disc can be conveniently pulled out radially, the mill disc can be repaired, or the radial fixing piece can be fixed after the radial fixing of the fan-shaped module is fixedly positioned, and various fan-shaped clamping pieces can be firmly fixed in a hoisting manner. Maintain or change the fan-shaped module of load buffering, repack again, then tighten again the below fixed screw of worker's shape fastener, jack-up motor casing for the jack at last, put back the cushion in place, with casing and basic spiro union, remove the jack, accomplish the change of fan-shaped module of load buffering. While there have been shown and described what are at present considered to be the principles of the invention, its essential features and advantages, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. The utility model provides a permanent-magnet machine directly drives vertical mill with two-way load buffer, including vertical mill, found mill driving system, two-way load buffer and base, driving system includes rotor mechanism and annular stator mechanism, the annular stator mechanism is located to rotor mechanism cover, annular stator mechanism drive rotor mechanism rotates, the rotor mechanism is located to the rotary drum cover, rotor mechanism drive rotary drum rotates, the rotary drum is connected with the mill on the vertical mill, be equipped with feed inlet and discharge gate on the barrel of vertical mill, be fixed with on the braced frame on the mill and found the roller, the center pin lower extreme of rotor mechanism has location bearing, the annular stator mechanism outside is motor housing, the lower extreme center at motor housing is established to the base, location bearing sets up on the base, its characterized in that: the annular stator mechanism up end is provided with the oil groove, and two-way load buffer soaks in the oil groove, and two-way load buffer includes fan-shaped module, and fan-shaped module is fixed in the mill below, and the oil groove combines together with annular stator mechanism up end, is provided with the runner plate in the oil groove on the contact surface with load device, and two-way load buffer or assembly are reversed on annular stator mechanism, and the runner plate is then fixed at the mill downside.

2. The permanent magnet motor direct-drive vertical mill with the bidirectional load buffering device as set forth in claim 1, wherein: the motor is a low-speed high-torque permanent magnet direct drive motor, and a high-voltage motor, a low-voltage motor or an excitation synchronous motor is selected as the motor.

3. The permanent magnet motor direct-drive vertical mill with the bidirectional load buffering device as claimed in claim 2, characterized in that: the annular stator mechanism and the rotor mechanism are both designed into an annular structure in a modularized mode, the annular stator mechanism is fixed inside a motor shell, and fan-shaped block-shaped stator cores and stator windings are distributed in the annular stator mechanism.

4. The permanent magnet motor direct drive vertical mill with the bidirectional load buffering device as set forth in claim 3, wherein: when the number of the annular stator mechanisms is larger than 1, the annular stator mechanisms comprise fan-shaped shells and stator cores in the fan-shaped shells, stator windings wound with the cores are arranged on the stator cores, and the fan-shaped shells are integrally spliced into an annular structure.

5. The permanent magnet motor direct drive vertical mill with the bidirectional load buffering device as set forth in claim 1, wherein: the bidirectional load device is composed of independent fan-shaped modules, the fan-shaped modules are mounted on a grinding disc through H-shaped clamping pieces, fixing screws are arranged on the H-shaped clamping pieces, each fan-shaped module is provided with a structure with a bearing effect in the radial direction and the axial direction, the lower portion of the whole bidirectional load buffering device is provided with an oil groove of a designed annular structure, a mirror plate is arranged in the oil groove, friction of the contact surface of the bidirectional load buffering device is further reduced, and the outer wall of the oil groove is provided with an oil inlet and an oil outlet.

6. The permanent magnet motor direct drive vertical mill with the bidirectional load buffering device as set forth in claim 5, wherein: the I-shaped clamping piece is assembled on the opening of the grinding disc, a gap is reserved between the upper part and the lower part of the opening of the grinding disc, a fixing screw is additionally arranged below each I-shaped clamping piece, and the fixing screws penetrate through the I-shaped clamping pieces to enable the fan-shaped modules to be firmly installed below the grinding disc.

7. The permanent magnet motor direct drive vertical mill with the bidirectional load buffering device as set forth in claim 5, wherein: the bidirectional bearing part of the fan-shaped module adopts a stainless steel semicircular pipe, a thrust bearing bush, a roller, a ball and a roller wheel combination design.

8. The permanent magnet motor direct drive vertical mill with the bidirectional load buffering device as claimed in any one of claims 2 to 7, wherein: the lateral surface of the fan-shaped module is provided with two small round holes penetrating through the lateral surface, so that the fan-shaped module can be hoisted, installed and detached when being installed, maintained and detached.

9. The permanent magnet motor direct-drive vertical mill with the bidirectional load buffering device as set forth in claim 7, wherein: the roller is a cylinder, the ball is a sphere, a groove with a corresponding size is formed in the surface of the fan-shaped module, and the roller and the ball are fixed on the surface of the fan-shaped module through welding or screwing.

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