GB2588870A

GB2588870A - A polishing apparatus for surfaces of clutch platen after being cast and molded

Info

Publication number: GB2588870A
Application number: GB2101335.4A
Authority: GB
Inventors: Cai Pumang
Original assignee: Hangzhou Hanggao Enterprise Management Consulting Co Ltd; Hangzhou Hanggao Enterprise Man Consulting Co Ltd
Current assignee: Hangzhou Hanggao Enterprise Management Consulting Co Ltd; Hangzhou Hanggao Enterprise Man Consulting Co Ltd
Priority date: 2020-06-10
Filing date: 2021-02-01
Publication date: 2021-05-12
Anticipated expiration: 2041-02-01
Also published as: CN111496591B; CN111496591A; GB2588870B; GB202101335D0

Abstract

A polishing apparatus for a cast or moulded clutch plate has an installation panel 1, fixing apparatus 2 and a polishing apparatus 3. The fixing apparatus has a working station 2, fixed rod 21, pivot blocks 23 connected to the working station via bearings, traction gear 24, vibration damper plates 25 and clutch plate mounting rods 26. The vibration damper plates are connected to the working station by springs. The polishing apparatus 3 has a drive gear 30 which drives connecting rod 31 connected to extrusion blocks, or cams, 33 which adjust the distance between the sliding laths 34 which alters the spacing between polishing plates 36. As the polishing plates separate blocking plates 38 open and fans 3a operate blowing metal filings away from the clutches whilst also cooling them. Clutches may be manually mounted onto rods 26 by rotating threaded rod 268 which retracts rotating links 266 thereby pulling in blocks 263, 267 allowing clutches to be slid over tube 262. Threaded rod 268 can then be rotated the other way to fix the clutches in place prior to machining.

Description

A POLISHING APPARATUS FOR SURFACES OF CLUTCH PLATEN AFTER

BEING CAST AND MOLDED

TECHNICAL FIELD

[0001] The present invention relates to the technical field of clutch platen casting, in particular to a polishing apparatus for surfaces of clutch platen after being cast and molded

BACKGROUND OF THE INVENTION

[0002] The clutch platen is an important part in the clutch, which plays a vital role in vehicle driving safety; as the clutch platen is one of the most important components in clutch assembly, according to drivers' willingness, through a link gear that transfers and cut down a power transmission of a motor and a cooperation with a clutch plate, the vehicle is capable of starting smoothly with a smooth shift under the condition that the motor does not overload, which have a great benefit to vehicles running; however, in order to ensure a good performance, a polishing operation is performed to the surfaces of the clutch platen when the clutch platen is produced, and there are also some deficiencies in existing clutch platen polishing apparatus when in polishing operation [0003] When in the polishing operations, there are the following problems: a. when in the polishing operations, many metal fillings are produced and temperatures of the polishing pieces and the clutch platen are rose, which will lead to a burn to operators when in collecting workpiece and also has a certain safety risk; b, when in the polishing operations, when the clutch platens are placed unevenly, clearances between adjacent two of the clutch platens have relative large errors, so when in polishing a plurality of the clutch platens, the polishing operations are easily failed to affect a polishing quality.

BRIEF SUMMARY OF THE INVENTION

[0004] The technical problem to be solved by the invention is to provide a polishing apparatus for surfaces of clutch platen after being cast and molded comprises an installation panel, fixed kits and a polishing kit, wherein the fixed kits are mounted on the installation panel, wherein the polishing kit is arranged on outer sides of the fixed kits, wherein the polishing kit is mounted on the installation panel, and the fixed kits comprise a fixed rod, a working station, two of pivot blocks, a traction gear, vibration damper plates and charging rods, wherein the fixed rod is mounted on the installation panel by welding, wherein the working station is mounted on the fixed rod by welding, wherein the working station evenly defines sliding grooves A, wherein two of the pivot blocks are connected to the working station via bearings, wherein the traction gear is mounted on lower end surfaces of the pivot blocks, wherein the vibration damper plates are connected to the pivot blocks through springs, wherein through holes B are arranged on the vibration damper plates, wherein the charging rods are arranged in the through holes B of the vibration damper plates, wherein the charging rods are mounted on the pivot blocks; whereby in work, the dutch platen to be polished is manually placed on the charging rods, and then the charging rods are started to fix the clutch platen to be polished, and then the charging rods are inserted into the pivot blocks by passing the vibration damper plates with human operations, thereby a load material fixing is realized.

[0005] The polishing kit comprises a first motor, drive gear, a connection rod, a rotary disc, two of extrusion blocks, two of sliding laths, connection columns, polishing plates, pulling strips, blocking plates, blow boxes, blowing fans a and a second motor, wherein the first motor is mounted on the working station by one of motor bases, wherein the drive gear for cooperating with the traction gear to use is mounted on an output shaft of the first motor, wherein the connection rod is mounted on the drive gear by welding, wherein the rotary disc is mounted on the connection rod, wherein two of the extrusion blocks are evenly mounted on the rotary disc by wielding, wherein two of sliding laths are abutted against outer sides of the extrusion blocks, and two of the sliding laths are elastically connected with the installation panel, wherein the connection columns are evenly mounted on two of the sliding laths by welding, wherein three of the connection columns are arranged on each of the sliding laths, wherein the polishing plates are mounted on the connection columns by welding, wherein the pulling strips are symmetrically mounted on outer sides of the polishing plates by welding, wherein the blocking plates are mounted on the pulling strips by welding, and the blocking plates are mounted on the blow boxes, wherein the blow boxes are mounted on the working station by welding, wherein the blowing fans a are mounted on the blow boxes, wherein the blowing fans a are mounted on an output shaft of the second motor, wherein the second motor is mounted on an outer wall of corresponding one of the blow boxes through one of the motor bases; whereby in work, the first motor is started to engage with the traction gear to rotate through the drive gear, thereby the charging rods are driven to rotate, and at the same time, the rotary disc is driven to rotate under an action of the connection rod, thereby an opening and closing operation of the polishing plates is controlled by actions of the extrusion blocks; when the polishing plates close, the clutch platen is polished, and the pulling strips are driven to move when the polishing plates separate with each other, thereby the blocking plates are driven to separate with each other, and then the second motor works to drive the blowing, fans to blow the clutch platen, thereby a heat dissipation and the metal filling cleaning are realized, [0006] As an optimized technical proposal, the charging rods comprise inserted blocks, mounting pipes, first blockers, feed rods, connection sleeves; rotating links, second blockers and threaded rods, wherein the inserted blocks are mounted on the pivot blocks,: wherein the mounting pipes are mounted on the inserted blocks by welding, wherein the first bloaters are elastically connected with the mounting pipes, wherein the feed rods are mounted in the mounting pipes, wherein the connection sleeves are evenly mounted on the feed rods, wherein the rotating links are evenly and rotatably connected with the connection sleeves, wherein the second Mockers are mounted on the rotating links, wherein the second Mockers are slidably connected with the mounting pipes, wherein the threaded rods are mounted on the feed rods wherein the threaded rods a-re in threaded to the mounting pipes; whereby in work, the clutch platen to be polished is placed on the mounting pipes manually, and then the threaded rods are rotated manually to drive the feed rods to move, thereby the second blockers are ejected, thereby under a combined action of the second blockers and the first blockers, the clutch platen is fixed, [0007] As an optimized technical proposal, spheroidal balls are evenly mounted on outer walls of the first blockers and the second blockers via the bearings, and the first blockers and the second blockers are in an staggered arrangement [0008] As an optimized technical proposal, inserted feet are evenly and rotatably connected with the inserted blocks, wherein resetting springs are connected between the inserted feet and the inserted blocks, wherein traction rods are mounted on the inserted feet, wherein the traction rods are rotatably connected to movable slide rods, wherein the movable slide rods are connected with the synchronous slide bars by welding, wherein the synchronous slide bars are mounted on collect rings by welding, wherein the collect rings are slidably connected to the inserted blocks [0009] As an optimized technical proposal, Hocking rods are evenly and siidably connected with inner walls of the through holes of the vibration damper plates, wherein clamping arc plate are slidably connected with the blocking rods, wherein telescopic springs are connected between the clamping arc plate and the vibration damper plates, and rotation rollers are connected to the Hocking rods fw the bearings.

[0010] As an optimized technical proposal, polishing pieces are evenly and slidably connected to the polishing plates, wherein threaded columns are mounted on the polishing pieces by welding, wherein threaded sleeves for cooperating with the threaded columns to be used are mounted on outer walls of the threaded columns, and the threaded sleeves are rotatably connected to the polishing plates.

[0011] In conclusion, the benefits of the invention are as follows: 1. the present invention is capable of solving the following problems: a. when in the polishing operations, many metal fillings are produced and temperatures of the polishing pieces and the clutch platen are rose, which will lead to a burn to operators when in collecting workpiece and also has a certain safety risk; b. when in the polishing operations, when the clutch platens are placed unevenly, clearances between adjacent two of the clutch platens have relative large errors, so when in polishing a plurality of the clutch platens, the polishing operations are easily failed to affect a polishing quality; 2. for the arrangement of the blow boxes, when the first motor is started, the connection rod drives the rotary disc to rotate, and at the same time, the polishing plates are driven to move under the actions of the extrusion blocks, thereby the pulling strips drive the blocking plates to open, and then the second motor is started to drive the blowing fans to blow, thereby the metal fillings on the surfaces of the clutch platen is blew away by air motions, and at the same time, a cooling process is performed to the polishing plates and the surfaces of the clutch platen, which prevent the operators form being burnt when collecting workpieces, 3. for the arrangements of the polishing plates, the threaded sleeves are twisted manually to drive the threaded columns to move with a threaded cooperation principle, thereby the polishing pieces are driven to move on the polishing plates, thereby the clearance between the polishing pieces are adjusted, which greatly avoids the clearances between the polishing pieces and the clutch platen due to an uneven placement of the clutch platen, so that a polishing effect will not be affected, and the polishing quality of the clutch platen can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Further explanations to this invention will be made below in combination with the drawings and embodiments [0013] FIG. 1 is a schematic stmctural diagram of the present invention; [0014] FIG. 2 is a side view showing a schematic structural diagram of the presentinvention; [0015] FIG. 3 is a cross-sectional view along "A-A" in FIG. 2 of the present invention; [0016] FIG. 4 is a cross-sectional view along "B-B" in FIG. 2 of the present invention; [0017] FIG. 5 is a cross-sectional view along "C-C" in FIG. 2 of the present invention; [0018] FIG. 6 is a sectional view of "A" in FIG. 2 of the present invention; [0019] FIG. 7 is a cross-sectional view along "D-D" in FIG. 5 of the present invention; [0020] FIG. 8 is a cross-sectional view along -E-E" in FIG. 5 of the present invention;

DETAILED DESCRIPTION OF THE INVENTION

[0021] To further illustrate the technological means and effectiveness of the invention taken to achieve a predetermined purpose of the invention, with the combination with figures 1-8, further descriptions are proposed in details according to the invention in the following: [0022] A polishing apparatus for surfaces of clutch platen after being cast and molded comprises an installation panel 1, fixed kits 2 and a polishing kit 3, wherein the fixed kits 2 are mounted on the installation panel 1, wherein the polishing kit 3 is arranged on outer sides of the fixed kits 2, wherein the polishing kit 3 is mounted on the installation panel 1, and the fixed kits 2 comprise a fixed rod 21, a working station 22, two of pivot blocks 23, a traction gear 24, vibration damper plates 25 and charging rods 26, wherein the fixed rod 21 is mounted on the installation panel 1 by welding, wherein the working station 22 is mounted on the fixed rod 21 by welding, wherein the working station 22 evenly defines sliding grooves A, wherein two of the pivot blocks 23 are connected to the working station 22 via bearings, wherein the traction gear 24 is mounted on lower end surfaces of the pivot blocks 23, wherein the vibration damper plates 25 are connected to the pivot blocks 23 through springs, wherein through holes B are arranged on the vibration damper plates 25, wherein the charging rods 26 are arranged in the through holes B of the vibration damper plates 25, wherein the charging rods 26 are mounted on the pivot blocks 23; whereby in work, the clutch platen to be polished is manually placed on the charging rods 26, and then the charging rods 26 are started to fix the clutch platen to be polished, and then the charging rods 26 are inserted into the pivot blocks 23 by passing the vibration damper plates 25 with human operations, thereby a load material fixing is realized.

[0023] The charging rods 26 comprise inserted blocks 261, mounting pipes 262, first blockers 263, feed rods 264, connection sleeves 265, rotating links 266, second blockers 267 and threaded rods 268, wherein the inserted blocks 261 are mounted on the pivot blocks 23. wherein the mounting pipes 262 are mounted on the inserted blocks 261 by welding, wherein the first blockers 263 are elastically connected with the mounting pipes 262, wherein the feed rods 264 are mounted in the mounting pipes 262, wherein the connection sleeves 265 are evenly mounted on the feed rods 264, wherein the rotating links 266 are evenly and rotatably connected with the connection sleeves 265, wherein the second blockers 267 are mounted on the rotating links 266, wherein the second blockers 267 are slidably connected with the mounting pipes 262, wherein the threaded rods 268 are mounted on the feed rods 264 by welding, wherein the threaded rods 268 are in threaded to the mounting pipes 262; whereby in work, the threaded rods 268 are rotated manually, and then the feed rods 264 are driven to move, and then the second blockers 267 are driven by the rotating links 266 to contract, and then the clutch platen to be polished is manually placed on the mounting pipes 262, and then the threaded rods 268 are twisted manually to drive the feed rods 264 to move, thereby the second blockers 267 are ejected, thereby under a combined action of the second blockers 267 and the first blockers 263, the clutch platen is clamped.

[0024] Spheroidal balls are evenly mounted on outer walls of the first blockers 263 and the second blockers 267 via the bearings, and the first blockers 263 and the second blockers 267 are in an staggered arrangement.

100251 Inserted feet 2.611 are evenly and rotatably connected with the inserted blocks 261, wherein resetting springs are connected between the inserted feet 261 I and the inserted blocks 261, wherein traction rods 2612 are mounted on the inserted feet 2611, wherein the traction rods 2612 are rotatably connected to movable slide rods 2613, wherein the movable slide rods 2613 are connected with the synchronous slide bars 2614 by welding, wherein the synchronous slide bars 2614 are mounted on collect rings 2615 by welding, wherein the collect rings 2615 are slidably connected to the inserted blocks 26 1; whereby in work, the collect rings 2615 are manually driven to drive the synchronous slide bars 2614 to move, thereby the movable slide rods 2613 are driven to move, thereby the traction rods 2612 are driven to drive the inserted feet 2611 to open and close, so dis-assemblies of the charging rods 26 are realized.

[0026] Blocking rods 251 are evenly and slidably connected with inner walls of the through holes of the vibration damper plates 25, wherein clamping arc plate 252 are slidably connected with the blocking rods 251, wherein telescopic springs are connected between the clamping arc plate 252 and the vibration damper plates 25, and rotation rollers are connected to the blocking rods 2.51 by the bearings.

[0027] The polishing kit 3 comprises a notor, a drive gear 30, a connection rod 31, a rotary disc 32, two of extrusion blocks 33, two of sliding laths 34, connection columns 35, polishing plates 36, pulling strips 37, blocking plates 38, blow boxes 39, blowing fans 3a and a second motor, wherein the first motor is mounted on the working station 22 by one of motor bases, wherein the drive gear 30 for cooperating with the traction gear 24 to use is mounted on an output shaft of the first motor, wherein the connection rod 31 is mounted on the drive gear 30 by welding, wherein the rotary disc 32 is mounted on the connection rod 31, wherein two of the extrusion blocks 33 are evenly mounted on the rotary disc 32 by welding, wherein two of sliding laths 34 are abutted against outer sides of the extrusion blocks 33, and two of the sliding laths 34 are elastically connected with the installation panel I, wherein the connection columns 35 are evenly mounted on two of the sliding laths 34 by welding, wherein three of the connection columns 35 are arranged on each of the sliding laths 34, wherein the polishing plates 36 are mounted on the connection columns 35 by welding, wherein the pulling strips 37 are symmetrically mounted on outer sides of the polishing plates 36 by welding, wherein the blocking plates 38 are mounted on the pulling strips 37 by welding, and the blocking plates 38 are mounted on the blow boxes 39, wherein the blow boxes 39 are mounted on the working station 22 by welding, wherein the blowing fans 3a are mounted on the blow boxes 39, wherein the blowing fans 3a are mounted on an output shaft of the second motor, wherein the second motor is mounted on an outer wall of corresponding one of the blow boxes 39 through one of the motor bases; whereby in work, the first motor is started to drive the drive gear 30 to rotate, thereby the traction gear 24 is driven to rotate under an action of a gear engagement, thereby the charging rods 26 are driven to rotate, and at the same time, the rotary disc 32 is driven to rotate under an action of the connection rod 31, thereby a distance between the sliding laths 34 is adjusted through extrusion forces of the extrusion blocks 33, thereby a distance between the polishing plates 36 is realized to be adjusted under actions of the connection columns 35; when an opening and dosing operation is performed between the polishing plates 36, the blocking plates 38 are driven to open and close by the pulling strips 37, and when the polishing plates 36 separate from each other, the blocking plates 38 open, and then the second motor is started to work to drive the blowing fans 3a to rotate, thereby metal fillings on the surface of the clutch platen is removed, and at the same time, an air cooling; operation is performed to the clutch platen, and when the polishing plates 36 close, the charging rods 26 are clamped to polish the clutch platen, thereby a polishing of the clutch platen is realized.

[0028] Polishing pieces 361 are evenly and slidably connected to the polishing plates 36, wherein threaded columns 362 are mounted on the polishing pieces 361 by welding, wherein threaded sleeves 363 for cooperating with the threaded columns 362 to be used are mounted on outer walls of the threaded columns 362, and the threaded sleeves 363 are rotatablY connected to the polishing plates 36.

[002.9] When in work: Si. fixed load material: the threaded rods 268 on the charging rods 26 are rotated manually, and then the feed rods 264 are driven to move, and then the second blockers 267 are driven by the rotating links 2.66. to contract, and then the clutch platen to be polished is manually placed on the mounting pipes 262, and then the threaded rods 268 is twisted manually to drive the feed rods 264 to move, thereby the second blockers 267 are ejected, thereby under the combined action of the second ',lockers 267 and the first blockers 263, he clutch platen is clamped, and then the charging rods 26 are inserted into the pivot blocks 23 by passing the vibration damper plates 25 with the human operations, thereby the load material fixing is realized; 52. parts polishing: after the load material is fixed, the first motor is started to drive the drive gear 30 to rotate, thereby the traction gear 21 is driven to rotate under an action of gear engagement, thereby the charging rods 26 are driven to rotate, and at the same time, the rotary disc 32 is driven to rotate under the action of the connection rod 31, thereby the distance between the sliding laths 34 is adjusted through the extrusion forces of the extrusion blocks 33, thereby the distance between the polishing plates 36 is realized to be adjusted under the actions of the connection columns 35; when the opening arid closing operation is performed between the polishing plates 36, the blocking plates 38 are driven to open and close by the pulling, stripsstrips 37, and when the polishing plates 36 separate from each other, the blocking plates 38 open, and then the second motor is started to work to drive the blowing fans 3a to rotate, thereby the metal fillings on the surface of the clutch platen is removed, and at the same time, the air cooling operation is performed to the clutch platen, and when the polishing plates 36 close, the charging rods 26 are clamped to polish the clutch platen, thereby the polishing of the clutch platen is realized; S3. after the parts are polished, the collect rings 2615 are manually driven to drive the synchronous slide bars 2614 to move, thereby the movable slide rods 2613 are driven to move, thereby the traction rods 2612 are driven to drive the inserted feet 2611 to open and close, so the dis-assemblies of the charging rods 26 are realized, and then the charging rods 26 are removed manually, and then the threaded rods 268 are rotated to contract the second blockers 267, and then the clutch platen is removed manually to realize a pick-up function; S4. S1-S3 are repeated again for performing a polishing to the surface of the clutch platen.

[0030] The above shows and illustrates the basic principles, main features, and advantages of the present invention. Persons skilled in the art should understand that, the invention is not subject to restrictions of the embodiments above, the embodiments and descriptions stated above only describe the principle of the present invention. The invention will be subject to modification and improvement based on its intention and extent, which will also fall into the claimed protection extent of this invention. The claimed protection extent of the invention shall be determined with reference to the appended claims and any equivalents thereof.

Claims

CLAIMSI. A polishing apparatus for surfaces of clutch platen after being cast and molded comprises an installation panel, fixed kits and a polishing kit, wherein the fixed kits are mounted on the installation panel, wherein the polishing kit is arranged on outer sides of the fixed kits, wherein the polishing kit is mounted on the installation panel, and the fixed kits comprise a fixed rod, a working station, two of pivot blocks, a traction gear, vibration damper plates and charging rods, wherein the fixed rod is mounted on the installation panel by welding, wherein the working station is mounted on the fixed rod by welding, wherein the working station evenly defines sliding grooves A, wherein two of the pivot blocks are connected to the working station via bearings, wherein the traction gear is mounted on lower end surfaces of the pivot blocks, wherein the vibration damper plates are connected to the pivot blocks through springs, wherein through holes B are arranged on the vibration damper plates, wherein the charging rods are arranged in the through holes B of the vibration damper plates, wherein the charging rods are mounted on the pivot blocks The polishing kit comprises a first motor, a drive gear, a connection rod, a rotary disc, two of extrusion blocks, two of sliding laths, connection columns, polishing plates, pulling strips, blocking plates, blow boxes, blowing fans a and a second motor, wherein the first motor is mounted on the working station by one of motor bases, wherein the drive gear for cooperating with the traction gear to use is mounted on an output shaft of the first motor, wherein the connection rod is mounted on the drive gear by welding, wherein the rotary disc is mounted on the connection rod, wherein two of the extrusion blocks are evenly mounted on the rotary disc by welding, wherein two of sliding laths are abutted against outer sides of the extrusion blocks, and two of the sliding laths are elastically connected with the installation panel, wherein the connection columns are evenly mounted on two of the sliding laths by welding, wherein three of the connection columns are arranged on each of the sliding laths, wherein the polishing plates are mounted on the connection columns by welding, wherein the pulling strips are symmetrically mounted on outer sides of the polishing plates by welding, wherein the blocking plates are mounted on the pulling strips by welding, and the blocking plates are mounted on the blow boxes, wherein the blow boxes are mounted on the working station by welding, wherein the blowing fans a are mounted on the blow boxes, wherein the blowing fans a are mounted on an output shaft of the second motor, wherein the second motor is mounted on an outer wall of corresponding one of the blow boxes through one of the motor bases.
2. The polishing apparatus for surfaces of clutch platen after being cast and molded defined in claim I, wherein the charging rods comprise inserted blocks, mounting pipes, first blockers, feed rods, connection sleeves, rotating links, second blockers and threaded rods, wherein the inserted blocks are mounted on the pivot blocks, wherein the mounting pipes are mounted on the inserted blocks by welding, wherein the first blockers are elastically connected with the mounting pipes, wherein the feed rods are mounted in the mounting pipes, wherein the connection sleeves are evenly mounted on the feed rods, wherein the rotating links are evenly and rotatably connected with the connection sleeves, wherein the second blockers are mounted on the rotating links, wherein the second blockers are slidably connected with the mounting pipes, wherein the threaded rods are mounted on the feed rods by welding, wherein the threaded rods are in threaded to the mounting pipes.
3 The polishing apparatus for surfaces of clutch platen after being cast and molded defined in claim 2, wherein the polishing apparatus for surfaces of clutch platen after being cast and molded defined in claim 1, wherein spheroidal balls are evenly mounted on outer walls of the first blockers and the second blockers via the bearings, and the first blockers and the second blockers are in an staggered arrangement.
4. The polishing apparatus for surfaces of clutch platen after being cast and molded defined in claim 2, wherein inserted feet are evenly and rotatably connected with the inserted blocks, wherein resetting springs are connected between the inserted feet and the inserted blocks, wherein traction rods are mounted on the inserted feet, wherein the traction rods are rotatably connected to movable slide rods, wherein the movable slide rods are connected with the synchronous slide bars by welding, wherein the synchronous slide bars are mounted on collect rings by welding, wherein the collect rings are slidably connected to the inserted blocks.
5. The polishing apparatus for surfaces of clutch platen after being cast and molded defined in claim I, wherein blocking rods are evenly and slidably connected with inner walls of the through holes of the vibration damper plates, wherein clamping arc plate are slidably connected with the blocking rods, wherein telescopic springs are connected between the clamping arc plate and the vibration damper plates, and rotation rollers are connected to the blocking rods by the bearings.
6. The polishing apparatus for surfaces of clutch platen after being cast and molded defined in claim I, wherein polishing pieces are evenly and slidably connected to the polishing plates, wherein threaded columns are mounted on the polishing pieces by welding, wherein threaded sleeves for cooperating with the threaded columns to be used are mounted on outer walls of the threaded columns, and the threaded sleeves are rotatably connected to the polishing plates.