CN214393305U

CN214393305U - Positioning mechanism of disc parts

Info

Publication number: CN214393305U
Application number: CN202120272663.4U
Authority: CN
Inventors: 赵梦霁; 高秀江; 韩志强
Original assignee: Nanjing Marposs Automation Equipment Co ltd
Current assignee: Nanjing Marposs Automation Equipment Co ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-10-15
Anticipated expiration: 2031-01-29

Abstract

The utility model discloses a positioning mechanism of disc part, include: the positioning plate, the positioning block assembly and the lifting assembly are arranged on the base; the positioning plate is provided with a through hole, the positioning block assembly is arranged on the positioning plate, and the workpiece is supported by the positioning block assembly; the positioning plate is connected to the lifting assembly and is driven to move up and down through the lifting assembly; the positioning block assembly comprises a reference seat, an adjusting seat, a positioning column and a positioning table, wherein the reference seat is arranged on the positioning plate, the adjusting seat is arranged on the reference seat, and the adjusting seat is fixedly connected with the reference seat through a screw; the positioning column is arranged on the adjusting seat, the positioning table is arranged on the reference seat, and the top end of the positioning table is lower than that of the positioning column. In this way, the utility model discloses a reference column and location platform support part change the position of adjustment seat on the reference base and adjust the circle size that the reference column encloses for this positioning mechanism can be applicable to the dish type part of different diameters, but wide application in the location of many varieties dish type part.

Description

Positioning mechanism of disc parts

Technical Field

The utility model relates to a part location measurement field, concretely relates to positioning mechanism of dish type part.

Background

With the influence of industry 4.0 on modern manufacturing industry, the demands of enterprises in manufacturing industry, which are continuously advanced and developed, on fully automated and unmanned equipment and production lines are more and more urgent. On one hand, the cost of labor is huge and the efficiency is low in the traditional manufacturing industry, and on the other hand, a lot of unstable factors exist for the control and quality guarantee of products, so that the industrial development trend of replacing manpower by full-automatic equipment is irreversible.

For disc parts such as hydraulic torque converter parts of an automatic gearbox, the parts need to be fixed and positioned in the machining process, and the parts are clamped and fixed in the traditional positioning mode. Since the parts are fixed, the operation is not flexible enough when the parts are machined, and the parts can only be used for a single type of parts, which is high in machining cost.

Disclosure of Invention

For solving the not enough of prior art existence, the utility model provides a positioning mechanism of dish type part.

A positioning mechanism for a disc-like part, comprising: the positioning plate, the positioning block assembly and the lifting assembly are arranged on the base; the positioning plate is provided with a through hole, the positioning block assembly is arranged on the positioning plate, and a workpiece is supported by the positioning block assembly; the positioning plate is connected to the lifting assembly and is driven to move up and down through the lifting assembly; the positioning block assembly comprises a reference seat, an adjusting seat, a positioning column and a positioning table, the reference seat is arranged on the positioning plate, the adjusting seat is arranged on the reference seat, and the adjusting seat is fixedly connected with the reference seat through a screw; the positioning column is arranged on the adjusting seat, the positioning table is arranged on the reference seat, and the top end of the positioning table is lower than that of the positioning column.

Preferably, the adjusting seat is provided with a waist-shaped hole, and the screw penetrates through the waist-shaped hole to be connected with the reference seat.

Preferably, the positioning block assembly is arranged in an annular array by taking a central shaft of the through hole of the positioning plate as an axis.

Preferably, the positioning block assembly further comprises a reference pin and an adjusting block, the reference pin is arranged on the reference seat, and the adjusting block is located between the reference pin and the adjusting seat.

Preferably, the top end of the positioning column is arranged to be conical.

Preferably, the lifting assembly comprises a positioning cylinder, a positioning support and a positioning guide rail, the positioning guide rail is arranged on the positioning support, and the positioning cylinder drives the positioning plate to move up and down along the positioning guide rail.

Preferably, the positioning plate further comprises a rotating assembly, the rotating assembly is connected with the positioning plate, and the rotating assembly drives the positioning plate to rotate.

Preferably, the rotating assembly comprises a rotating motor, the positioning plate is connected to the rotating motor, and the rotating motor drives the positioning plate to rotate.

Preferably, the rotating assembly comprises a moving cylinder, a rack, a gear and a rotating shaft, the rack is connected to the moving cylinder, the gear is meshed with the rack, the rotating shaft is connected to the gear, and the positioning plate is connected to the gear through the rotating shaft.

Preferably, the rotating assembly further comprises a sliding rail and a sliding block, the sliding block is arranged on the sliding rail and is connected with the sliding rail in a sliding mode, and the rack is arranged on the sliding block.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model has the following beneficial effect:

the positioning mechanism for the disc parts is provided, and the size of a circle surrounded by the positioning columns is adjusted by changing the positions of the adjusting seat on the reference seat through the positioning columns and the positioning table supporting parts, so that the positioning mechanism can be suitable for disc parts with different diameters and can be widely applied to positioning of various disc parts; the disc parts are positioned and supported in the circumferential direction, so that the operation is simple, convenient and flexible, and the disc parts can be conveniently processed while the positioning is stable.

Drawings

Fig. 1 is a schematic structural diagram of a positioning mechanism for a disc part according to the present invention.

Fig. 2 is a front view of the positioning mechanism for disc parts of the present invention.

Fig. 3 is a schematic structural diagram of a positioning block assembly in the positioning mechanism for disc parts according to the present invention.

Fig. 4 is a schematic structural diagram of the dynamic measurement device for disc parts, to which the positioning mechanism for disc parts of the present invention is applied.

FIG. 5 is a schematic structural diagram of a dynamic auxiliary mechanism in the dynamic measurement device for disk parts.

Fig. 6 is a cross-sectional view of the dynamic assistance mechanism excluding the assistance cylinder in the dynamic measurement apparatus for a disc-like member.

Fig. 7 is a schematic structural diagram of a diameter measuring mechanism in the dynamic measuring device for the disc type parts.

Fig. 8 is a sectional view of a diameter measuring mechanism in the dynamic measuring apparatus of a disk type part.

Description of reference numerals:

1. a positioning mechanism; 11. positioning a plate; 12. a positioning block assembly; 121. a reference base; 122. an adjusting seat; 123. a positioning column; 124. a positioning table; 125. a reference pin; 126. an adjusting block; 13. a lifting assembly; 131. positioning the air cylinder; 132. positioning the bracket; 133. positioning the guide rail; 14. a rotating assembly; 141. a moving cylinder; 142. a rack; 143. a gear; 144. a rotating shaft; 145. a slide rail; 146. a slider;

2. a dynamic assistance mechanism; 21. an auxiliary cylinder; 22. a fixing plate; 23. a pressure head; 24. a rotating assembly; 241. an auxiliary motor; 242. a driving wheel; 243. a driven wheel; 244. a synchronous belt; 245. a driving seat; 246. a drive shaft; 247. a bearing; 25. an elastic component; 251. a floating shaft; 252. a spring; 253. a guide sleeve; 26. a reinforcing plate;

3. a diameter measuring mechanism; 31. a base plate; 32. a supporting seat; 321. a support shaft; 322. avoiding holes; 33. a support bar; 34. a sensor; 35. a connecting rod; 36. a moving assembly; 361. a fixed block; 362. a track; 363. a screw; 364. a moving block; 37. a limiting rod;

4. a work table;

5. and (5) a workpiece.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Referring to the attached drawings, the dynamic measuring equipment for the disc parts comprises a positioning mechanism 1, a dynamic auxiliary mechanism 2 and a diameter measuring mechanism 3. The positioning mechanism 1, the dynamic auxiliary mechanism 2 and the diameter measuring mechanism 3 can be fixedly arranged on the workbench 4.

The positioning mechanism 1 comprises a positioning plate 11, a positioning block assembly 12 and a lifting assembly 13. A through hole is formed in the positioning plate 11, the positioning block assembly 12 is arranged on the positioning plate 11, and the workpiece 5 is supported through the positioning block assembly 12. The positioning block assemblies 12 are arranged in an annular array mode by taking the central shaft of the through hole of the positioning plate 11 as an axis, and the number of the positioning block assemblies 12 is at least three. The workpiece 5 is positioned above the through hole of the positioning plate 11 and is supported by a positioning block assembly 12 positioned at the periphery of the through hole.

The positioning block assembly 12 includes a reference seat 121, an adjusting seat 122, a positioning column 123 and a positioning table 124, the reference seat 121 is disposed on the positioning plate 11, the adjusting seat 122 is disposed on the reference seat 121, and the adjusting seat 122 is fixedly connected to the reference seat 121 through a screw. The positioning post 123 is disposed on the adjusting base 122, and the positioning post 123 and the adjusting base 122 are assembled into a whole. The positioning table 124 is arranged on the reference seat 121, and the top end of the positioning table 124 is lower than the top end of the positioning column 123, that is, when positioning is performed, the top surface of the positioning table 124 contacts with the workpiece 5, the side surface of the positioning column 123 contacts with the workpiece 5, and the positioning table and the positioning column cooperate to complete circumferential and axial positioning support of the disc-like workpiece 5, so that positioning stability is improved.

The adjusting seat 122 is provided with a kidney-shaped hole, and a screw passes through the kidney-shaped hole to be connected with the reference seat 121. The setting of waist type hole makes can change the clearance between adjustment seat 122 and the benchmark round pin 125, and then changes the distance of reference column 123 relative benchmark round pin 125 through changing the clearance between adjustment seat 122 and the benchmark round pin 125, satisfies the requirement that can still firmly assemble after the position removes to can satisfy the location of the work piece of not unidimensional, realize the location compatibility to multiple diameter part.

To improve the positioning stability, the positioning block assembly 12 further includes a reference pin 125 and an adjustment block 126, the reference pin 125 is disposed on the reference seat 121, and the adjustment block 126 is located between the reference pin 125 and the adjustment seat 122. The size of the adjustment block 126 may be adjusted according to the distance between the reference pin 125 and the adjustment seat 122, and the adjustment block 126 may be brought into contact with both the reference pin 125 and the adjustment seat 122. The arrangement of the reference pin 125 and the adjusting block 126 prevents the adjusting seat 122 from being displaced after assembly, which affects the positioning effect.

The top end of the positioning column 123 is arranged to be conical, so that an auxiliary guiding effect is achieved in the falling and positioning process of the workpiece 5, the fault tolerance rate of equipment is increased, the requirement on the falling precision is reduced, the complexity of a falling mechanism of the workpiece 5 is simplified, and the practicability is higher.

The positioning plate 11 is connected to the lifting assembly 13, and the positioning plate 11 is driven to move up and down by the lifting assembly 13. The lifting assembly 13 comprises a positioning cylinder 131, a positioning bracket 132 and a positioning guide rail 133, the positioning guide rail 133 is two linear guide rails, the positioning guide rail 133 is arranged on the positioning bracket 132, and the positioning cylinder 131 drives the positioning plate 11 to move up and down along the positioning guide rail 133, so that the stable up and down movement and accurate position of the positioning plate 11 can be ensured.

This locating piece subassembly 12 has the direction function when work piece 5 whereabouts, can carry out preliminary location to work piece 5 through the external diameter and guarantee that work piece 5 position is accurate and can compatible multiple diameter's part simultaneously. The positioning block components 12 are circumferentially and uniformly distributed on the positioning plate 11, and the circumferentially and uniformly distributed structure can effectively position the circular disc parts and roughly fix the axis position at the same time, so that the positioning and centering of the workpiece 5 can be realized by the equipment to further move the workpiece 5. In addition, the workpiece 5 is axially placed on the positioning table 124 and is provided with the adjusting block 126, so that different adjusting blocks 126 can be assembled to position disk parts with different outer diameters, and the positioning device is simple and convenient to operate and high in compatibility.

The positioning plate 11 may be provided with a plurality of positioning positions, that is, one positioning plate 11 may be used to position a plurality of workpieces 5 at the same time, and in order to enable the plurality of workpieces 5 to be automatically switched to the detection position, the positioning mechanism 1 further includes a rotating assembly 14, the rotating assembly 14 is connected to the positioning plate 11, and the rotating assembly 14 drives the positioning plate 11 to rotate. The positioning quantity of the workpieces 5 can be designed according to actual requirements, the multi-station flexible operation is met, the multi-station action saves equipment beats, and the production efficiency is improved.

The rotating assembly 14 may include a rotating motor, and the positioning plate 11 is connected to the rotating motor, and the positioning plate 11 is directly driven to rotate by the rotating motor.

The rotating assembly 14 may also include a moving cylinder 141, a rack 142, a gear 143, and a rotating shaft 144, wherein the rack 142 is connected to the moving cylinder 141, the gear 143 is engaged with the rack 142, the rotating shaft 144 is connected to the gear 143, and the positioning plate 11 is connected to the gear 143 through the rotating shaft 144. In order to improve the smoothness of the rack 142 driven by the moving cylinder 141, the rotating assembly 14 further includes a slide rail 145 and a slider 146, the slider 146 is disposed on the slide rail 145, the slider 146 is slidably connected to the slide rail 145, and the rack 142 is disposed on the slider 146. The slide rail 145 is designed to ensure that the rack 142 moves accurately.

The rack 142 is pushed out by the moving cylinder 141 to move transversely, and then the rack 142 can drive the gear 143 engaged with the rack 142 to rotate, the gear 143 is engaged with the rotating shaft 144 through a flat key, and the gear 143 rotates circumferentially to drive the rotating shaft 144 to rotate, so that the positioning plate 11 connected to the rotating shaft 144 rotates. The displacement distance of the moving cylinder 141 pushing out the rack 142 acts on the gear 143 to generate a rotation angle, the displacement distance meets the use requirement through design, and the final accurate positioning angle position of the positioning plate 11 can be determined through the position of the internally mounted limit screw.

The lifting component 13 descends to enable the workpiece 5 to automatically fall, so that the workpiece 5 is prevented from being pressed by external force to be in place, and the appearance of the workpiece 5 is protected from being influenced. The switching of different stations is completed through the switching of the rotating assembly 14, after the measurement of one workpiece 5 is completed, the lifting assembly 13 drives the workpiece 5 to ascend through the positioning assembly, and the rotating assembly 14 rotates the next workpiece 5 to the detection position.

The dynamic assistance mechanism 2 is located above the positioning plate 11, and the dynamic assistance mechanism 2 includes an assistance cylinder 21, a fixed plate 22, a pressure head 23 and a rotating assembly 24. The fixed plate 22 is connected on the auxiliary cylinder 21, the auxiliary cylinder 21 drives the fixed plate 22 to move up and down, the pressure head 23 is arranged on the fixed plate 22, the pressure head 23 is connected with the rotating assembly 24, and the rotating assembly 24 drives the pressure head 23 to rotate.

Because the pressure head 23 and the rotating assembly 24 are both connected to the fixing plate 22, the auxiliary cylinder 21 drives the fixing plate 22 to move up and down, and for improving stability, the dynamic auxiliary mechanism 2 further comprises a reinforcing plate 26, and the reinforcing plate 26 is symmetrically arranged on the fixing plate 22. The reinforcing plate 26 makes the fixing plate 22 firm and reliable, improves the strength and rigidity, and effectively ensures reliable operation without deformation.

The rotating assembly 24 includes an auxiliary motor 241, a driving pulley 242, a driven pulley 243 and a timing belt 244, and the auxiliary motor 241 is a servo motor. A driving pulley 242 and a driven pulley 243 are provided on the fixed plate 22, the driving pulley 242 and the driven pulley 243 are connected by a timing belt 244, the driving pulley 242 is connected to an auxiliary motor 241, and the auxiliary motor 241 drives the driving pulley 242 to rotate.

The ram 23 is connected to the follower 243, and the workpiece 5 is connected through the ram 23. In order to enable the pressing head 23 to drive the workpiece 5 to rotate, the pressing head 23 can be directly pressed on the workpiece 5, and the workpiece 5 is driven to rotate through the friction force of the pressing head and the workpiece 5; it is also possible to provide the indenter 23 with serrations on the axial surface of the indenter 23 by which the workpiece 5 is attached.

The rotating assembly 24 further includes a drive socket 245, a drive shaft 246 and a bearing 247, the drive socket 245 being disposed on the fixed plate 22, the drive shaft 246 being connected to the driven wheel 243, the drive shaft 246 being located within the drive socket 245. The bearing 247 is sleeved on the driving shaft 246, and the driving shaft 246 is connected with the driving seat 245 through the bearing 247. The bearing 247 supports the driving shaft 246 to ensure the stability of the rotation, the fixed axis of the driving shaft 246 rotates without deviation, the bearing 247 is assembled in the driving seat 245, two ends of the bearing 247 are fixed by end covers in a sealing way, and sealing check rings are arranged in the end covers to play a dustproof role, so that the bearing 247 is not polluted, and the service life of the bearing 247 is prolonged.

The auxiliary motor 241 drives the driving pulley 242 to rotate, the driving pulley drives the driven pulley to rotate through the timing belt 244, and the driven pulley is tightly connected with the driving shaft 246 and then drives the driving shaft 246 to rotate. After the pressing head 23 presses the workpiece 5, the pressing head 23 rotates to drive the workpiece 5 to rotate through friction force generated by pressing so as to complete dynamic measurement.

The dynamic assistance mechanism 2 further comprises an elastic assembly 25, wherein the elastic assembly 25 comprises a floating shaft 251 and a spring 252, and the pressure head 23 is mounted on the floating shaft 251 through a fastening screw. A spring 252 is provided between the floating shaft 251 and the drive shaft 246, one end of the spring 252 being connected to the floating shaft 251, and the other end of the spring 252 being connected to the drive shaft 246.

The elastic assembly 25 further includes a guide sleeve 253, and the spring 252 and the floating shaft 251 are located within the guide sleeve 253. When the floating shaft 251 floats up and down in the guide sleeve 253, the stability and reliability of the shaft motion of the floating shaft 251 are ensured through the guide sleeve, so that the floating shaft 251 does not deviate in rotation and moves up and down more smoothly.

When the pressing head 23 presses the workpiece 5, the spring 252 is in a compressed state, and the workpiece 5 is pressed by the restoring force of the spring 252, so that the pressing force required by the workpiece 5 is ensured, and the workpiece 5 is not pressed and damaged by hard connection. Meanwhile, the pressure head 23 has a certain retraction distance, so that the dynamic auxiliary mechanism 2 can measure and compress workpieces 5 with different heights, and the compatibility is stronger and the flexibility is higher.

The diameter measuring mechanism 3 is located below the positioning plate 11, the diameter measuring mechanism 3 includes a bottom plate 31, a support seat 32 and a sensor 34, and the support seat 32 is disposed on the bottom plate 31. The diameter measuring mechanism 3 further includes a support rod 33, the support rod 33 is disposed on the bottom plate 31, the support seat 32 is disposed on the support rod 33, and the support seat 32 is connected to the bottom plate 31 through the support rod 33.

The sensors 34 are arranged on the bottom plate 31 in pairs, and the detection of form and position tolerance is completed by numerically fitting the sensors 34 to the reference axis. The diameter measuring mechanism 3 further includes a connecting rod 35, the connecting rod 35 is disposed on the bottom plate 31, the sensor 34 is disposed on the connecting rod 35, and the sensor 34 is connected to the bottom plate 31 through the connecting rod 35. Since the sensors 34 are arranged in pairs, the height of the connecting rod 35 of the same pair of sensors 34 needs to be consistent, and the height of the connecting rod 35 of different pairs of sensors 34 may be inconsistent. The height of the connecting rods 35 of the sensors 34 of different pairs can be determined by the height of the cross section to be measured, and the cross sections of one workpiece 5 with different heights can be measured by setting a plurality of pairs of connecting rods 35 to different heights, so that the measuring efficiency is greatly improved.

In order to facilitate the adjustment of the height of the connecting rod 35, the connecting rod 35 may be provided as a telescopic structure, which may employ a conventional telescopic rod structure in the art.

The supporting base 32 is provided with a supporting shaft 321 and avoiding holes 322, the through holes are distributed in an annular array by taking the central shaft of the supporting shaft 321 as an axis, and the sensor 34 penetrates through the avoiding holes 322 of the supporting base 32. The sensor 34 is supported by the support base 32, and the sensor 34 can measure the inner diameter of the workpiece 5 through the relief hole 322 of the support base 32.

The support shaft 321 includes a first support table and a second support table, the first support table is disposed on the second support table, and the diameter of the first support table is smaller than that of the second support table. The support shaft 321 is provided in a stepped shape so that the support shaft 321 itself can support the workpiece 5, and the sensor 34 is provided at the outer periphery of the support shaft 321 so that the outer diameter of the workpiece 5 can be measured by the sensor 34.

The diameter measuring mechanism 3 further comprises a moving assembly 36, the moving assembly 36 comprises a fixed block 361, a track 362, a screw 363 and a moving block 364, the fixed block 361 and the track 362 are arranged on the bottom plate 31, the screw 363 penetrates through the fixed block 361, and the screw 363 is in threaded connection with the fixed block 361. The moving block 364 is connected to the screw 363, the moving block 364 is disposed on the track 362, and the moving block 364 is slidably connected to the track 362. The rotating screw rod 363 drives the moving block 364 to move transversely, and the moving block 364 can drive the sensor 34 to move transversely by moving transversely, so that the position of a measuring point of the sensor 34 is changed, and workpieces 5 with different diameters can be measured. Because the moving stroke range of the screw 363 is large, the diameter size of the workpiece 5 to be measured can have a large variation range, and therefore the range of the workpiece 5 which can be compatibly measured by the diameter measuring mechanism 3 is wider.

In order to prevent the positioning plate 11 in the positioning mechanism 1 from excessively descending, the diameter measuring mechanism 3 further comprises limiting rods 37, the limiting rods 37 are arranged on the bottom plate 31, and the distance between the limiting rods 37 is matched with the diameter of the positioning plate 11. That is, the positioning plate 11 can be lowered at most until it contacts the limiting rod 37, so as to prevent the positioning plate from being further lowered to interfere with the measurement of the sensor 34 and even crush the diameter measuring mechanism 3.

In actual use, after the workpiece 5 is placed on the positioning plate 11 in the positioning mechanism 1, the rotating assembly 14 rotates the workpiece 5 to the detection position. The positioning cylinder 131 in the positioning mechanism 1 drives the positioning plate 11 to descend until the workpiece 5 falls on the supporting seat 32 of the diameter measuring mechanism 3, and the positioning plate 11 continues to descend under the action of the positioning cylinder 131. The auxiliary cylinder 21 in the dynamic auxiliary mechanism 2 drives the ram 23 to descend and press the workpiece 5, and the auxiliary motor 241 drives the ram 23 to rotate, so as to drive the workpiece 5 to rotate under the action of friction force. Meanwhile, a sensor 34 in the diameter measuring mechanism 3 feeds back a detection value to complete dynamic measurement data acquisition and feeds back the detection value to an industrial personal computer for data analysis and judgment.

The above is only the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and all the same principles are included in the protection scope of the present invention.

Claims

1. A positioning mechanism for a disc-like part, comprising: the positioning plate, the positioning block assembly and the lifting assembly are arranged on the base; the positioning plate is provided with a through hole, the positioning block assembly is arranged on the positioning plate, and a workpiece is supported by the positioning block assembly; the positioning plate is connected to the lifting assembly and is driven to move up and down through the lifting assembly; the positioning block assembly comprises a reference seat, an adjusting seat, a positioning column and a positioning table, the reference seat is arranged on the positioning plate, the adjusting seat is arranged on the reference seat, and the adjusting seat is fixedly connected with the reference seat through a screw; the positioning column is arranged on the adjusting seat, the positioning table is arranged on the reference seat, and the top end of the positioning table is lower than that of the positioning column.

2. The positioning mechanism for a disc-like member as set forth in claim 1, wherein: the adjusting seat is provided with a waist-shaped hole, and the screw penetrates through the waist-shaped hole to be connected with the reference seat.

3. The positioning mechanism for a disc-like member as set forth in claim 1, wherein: the positioning block assemblies are arranged in an annular array mode by taking the central shaft of the through hole of the positioning plate as an axis.

4. The positioning mechanism for a disc-like member as set forth in claim 1, wherein: the positioning block assembly further comprises a reference pin and an adjusting block, the reference pin is arranged on the reference seat, and the adjusting block is located between the reference pin and the adjusting seat.

5. The positioning mechanism for a disc-like member as set forth in claim 1, wherein: the top end of the positioning column is arranged to be conical.

6. The positioning mechanism for a disc-like member as set forth in claim 1, wherein: the lifting assembly comprises a positioning cylinder, a positioning support and a positioning guide rail, the positioning guide rail is arranged on the positioning support, and the positioning cylinder drives the positioning plate to move up and down along the positioning guide rail.

7. The positioning mechanism for a disc-like member as set forth in claim 1, wherein: the positioning plate is connected with the rotating assembly, and the rotating assembly drives the positioning plate to rotate.

8. The positioning mechanism for a disc-like member as set forth in claim 7, wherein: the rotating assembly comprises a rotating motor, the positioning plate is connected to the rotating motor, and the rotating motor drives the positioning plate to rotate.

9. The positioning mechanism for a disc-like member as set forth in claim 7, wherein: the rotating assembly comprises a moving cylinder, a rack, a gear and a rotating shaft, the rack is connected to the moving cylinder, the gear is meshed with the rack and connected to the rack, the rotating shaft is connected to the gear, and the positioning plate is connected to the gear through the rotating shaft.

10. The positioning mechanism for a disc-like member as set forth in claim 9, wherein: the rotating assembly further comprises a sliding rail and a sliding block, the sliding block is arranged on the sliding rail and is connected with the sliding rail in a sliding mode, and the rack is arranged on the sliding block.