CN113618509A

CN113618509A - Circular workpiece polishing device

Info

Publication number: CN113618509A
Application number: CN202110971430.8A
Authority: CN
Inventors: 胡章成
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2021-11-09

Abstract

The invention discloses a circular workpiece polishing device, and relates to the technical field of machinery. Including electronic disc, electronic disc bottom is rotated and is installed a work piece location section of thick bamboo, work piece location section of thick bamboo bottom and wait to grind work piece top swing joint, electronic disc bottom is rotated and is installed in the rotor plate top, fixed mounting has shell fragment elastic connection between rotor plate outer wall and the electronic disc bottom outer wall, rotor plate bottom slidable mounting is in slide bar top No. one, slide bar bottom is rotated and is installed in the slider top, slider bottom slidable mounting is on backup pad top outer wall. This circular workpiece grinding device, the power of polishing to circular workpiece of the electronic disc control sanding block through different rotational speeds to can add the coolant liquid automatically according to the thematic principle of friction in the polishing process, reach automatically cooled's effect, can play fine splashproof and the function of filtering the collection simultaneously through cowl and arc filter.

Description

Circular workpiece polishing device

Technical Field

The invention relates to the technical field of machinery, in particular to a circular workpiece polishing device.

Background

Machining refers to a process of changing the physical dimensions or properties of a workpiece by a mechanical device. The difference in the machining method can be divided into cutting machining and pressing machining. The production process of a machine refers to the whole process of making a product from raw materials (or semi-finished products). For machine production, the raw material transportation and preservation, production preparation, blank manufacturing, part processing and heat treatment, product assembly and debugging, painting and packaging and the like are included. The content of the production process is very wide, modern enterprises organize production and guide production by using the principle and method of system engineering, and the production process is regarded as a production system with input and output.

In the current machining of mechanical parts piece in-process, cylindric metal strip among the circular workpiece carries out the in-process of processing, need polish the operation usually, but current grinding device's the dynamics of polishing all is fixed, and the required dynamics of polishing of the cylindric metal strip of different roughness is different for current grinding device is difficult to the dynamics of polishing of self to cylindric metal strip, thereby causes grinding device life lower, and the efficiency of polishing is lower.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a circular workpiece polishing device, which solves the problems in the background technology.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a circular workpiece grinding device, includes electronic disc, electronic disc bottom is rotated and is installed a work piece location section of thick bamboo, work piece location bobbin base portion and the work piece top swing joint of waiting to grind, electronic disc bottom is rotated and is installed in the rotor plate top, fixed mounting has shell fragment elastic connection between rotor plate outer wall and the electronic disc bottom outer wall, rotor plate bottom slidable mounting is in slide bar top No. one, slide bar bottom is rotated and is installed in the slider top, slider bottom slidable mounting is on backup pad top outer wall, backup pad top outer wall is inlayed and is had the piece of polishing, fixed mounting has shell fragment elastic connection between piece outer wall and the slider outer wall of polishing.

Preferably, the polishing block inner wall is fixedly provided with a partition plate, a cavity formed between the right side of the partition plate and the inner wall of the polishing block is filled with cooling liquid, the partition plate is penetrated through and fixedly provided with a fixing plate, and the fixing plate is fixedly embedded on the inner wall of the left end of the polishing block.

Preferably, the outer wall of the top of the fixing plate is slidably mounted with a sliding plate, the outer wall of the sliding plate is fixedly embedded at one end of the connecting plate, the connecting plate penetrates through and is slidably mounted on the partition plate, the other end of the connecting plate is fixedly embedded on the outer wall of the second sliding plate, the second sliding plate is slidably mounted on the outer wall of the fixing plate, and an elastic piece is fixedly mounted between the outer wall of the right end of the second sliding plate and the inner wall of the right end of the polishing block.

Preferably, run through and fixed mounting has the logical liquid board on the baffle, lead to the liquid board left end and inlay admittedly on the sanding block and communicate, lead to the liquid board upper left end and inlay inherent arc hollow slab and communicate, the arc hollow slab top pierces through in the fixed plate.

Preferably, run through and slidable mounting has No. two slide bars on the fixed plate, No. two slide bar tops set up to the triangle conical surface, No. two slide bars run through and slidable mounting on logical liquid board and sanding block, No. two slide bar outer walls are inlayed and are had the stripper bar, No. two inside movable mounting of slide bar has the striking ball.

Preferably, the bottom of the extrusion rod is movably connected with the top of the semicircular lug, the bottom of the semicircular lug is fixedly embedded on the outer wall of the top of the arc-shaped filter plate, the outer wall of the arc-shaped filter plate is movably arranged on the inner wall of the arc-shaped baffle plate, the arc-shaped filter plate is fixedly embedded on the connecting rod, and the connecting rod is fixedly embedded on the outer wall of the supporting plate.

Preferably, the outer wall of the top of the arc-shaped baffle is fixedly embedded on the outer wall of the bottom of the fixed column, the outer wall of the top of the fixed column is fixedly embedded on the outer wall of the bottom of the third sliding plate, the third sliding plate is slidably mounted on the outer connecting plate, and the outer connecting plate is rotatably mounted on the outer wall of the rotating plate.

(III) advantageous effects

The invention provides a polishing device for a circular workpiece. The method has the following beneficial effects:

(1) the circular workpiece polishing device is characterized in that a workpiece to be polished is fixed on a workpiece positioning cylinder, then a polishing block can be driven to rotate by the rotation of an electric disc to start polishing, a rotating plate can be driven to rotate by the rotation of the electric disc, the rotating plate can drive a first sliding rod to rotate by the rotation of the electric disc, circular workpieces with different roughness degrees can be dealt with by different rotating speeds of the electric disc, the centrifugal force generated by the electric discs with different rotating speeds is different, the swinging amplitude of the first sliding rod driven by the rotating plate is different, the higher the rotating speed is, the larger the swinging amplitude of the first sliding rod is, the slide rod can push the slide block outwards, the slide block can stretch a spring plate to reduce the elasticity applied to the polishing block, the pressure of the polishing block on the circular workpieces is smaller, and the circular workpieces can be polished without using large pressure by the polishing block due to the higher rotating speed, thereby effectively prolonging the service life of the sanding block.

(2) This circular workpiece grinding device, follow the rotation of electronic disc through the sanding block and polish circular workpiece, make sanding block and circular workpiece's department of polishing can the frictional heating, thereby heat the temperature in the space that slide left and fixed plate formed, cause the effect of thermal expansion, a slide just can move right owing to thermal expansion afterwards, a slide promotes the connecting plate and moves right, the connecting plate alright continue to promote No. two slides and move right, No. two slides alright with coolant liquid to leading to the inside extrusion of liquid board, make the coolant liquid that leads to the liquid board flow from sanding block and circular workpiece's department of polishing by the extrusion, reach self-cooling's effect.

(3) This circular workpiece grinding device, after No. two slide extrusion cooling liquids got into logical liquid intralamellar part, the coolant liquid that leads to in the liquid intralamellar part can be extruded the sanding block and produce the cooling effect, and simultaneously, partly also can flow into the hollow intralamellar part of arc inside of logical liquid intralamellar part, thereby carry out the cooling effect to the hot space that a slide left and fixed plate formed, can cause sanding block outside and inside refrigerated effect simultaneously, make cooling efficiency more high-efficient, thereby improve the utilization ratio of coolant liquid, also can prevent that sanding block long-term cold and hot uneven and lead to sanding block life-span to reduce.

(4) This circular workpiece grinding device, through being provided with cowl and cowl, cowl can carry out the effect that the check were kept off and were collected to the residue of flying out of polishing, and cowl can carry out the effect that separates residue and coolant liquid, make things convenient for the staff to collect the coolant liquid, simultaneously according to the different rotational speeds of electronic disc, the swing range of rotor plate is different, the rotational speed is faster, rotor plate wobbling range is bigger, make the rotation of rotor plate can drive external board rebound, external board just can upwards mention the fixed column through No. three slides of accessible, the fixed column alright upwards mention cowl, make and to carry out the check to the residue that leads to the flying out scope grow because the rotational speed improves, cowl's check efficiency is improved.

(5) This circular workpiece grinding device, when a slide because the thermal expansion produces when moving right, slide alright extrude the triangle conical surface at No. two slide bar tops, No. two slide bars alright be extruded by a slide outside and move, No. two slide bars drive the action that the stripper was followed and is outwards moved together, and the stripper just can carry out an impact to semicircular convex block, make semicircular convex block drive the arc filter and produce the vibration, thereby can accelerate the separation of coolant liquid and residue, improve the filter effect, the in-process of vibration is removed at No. two slide bars simultaneously, No. two inside impact balls of slide bar also can be in No. two inside striking vibrations that carry on of slide bar, thereby make No. two slide bars can produce the self-oscillation and shake adnexed dust on the outer wall, and service life is prolonged.

Drawings

FIG. 1 is a schematic view of the overall external three-dimensional structure of the present invention;

FIG. 2 is a schematic view of the internal three-dimensional structure of the sanding block of the present invention;

FIG. 3 is a schematic view of the external three-dimensional structure of the sanding block of the present invention;

FIG. 4 is a schematic view of the external three-dimensional structure of the arc-shaped filter plate according to the present invention;

FIG. 5 is an elevational view and a sectional view of the inside of a second slide bar according to the present invention;

FIG. 6 is a schematic view of the external three-dimensional structure of the liquid passing plate of the present invention.

In the figure: 1. an electric disc; 2. a workpiece positioning cylinder; 3. a workpiece to be ground; 4. a rotating plate; 5. a first sliding rod; 6. a slider; 7. a support plate; 8. grinding blocks; 9. a partition plate; 10. a fixing plate; 11. an arc-shaped hollow plate; 12. a first slide plate; 13. a connecting plate; 14. a second sliding plate; 15. a liquid passing plate; 16. a second sliding rod; 17. an extrusion stem; 18. a semicircular bump; 19. an arc-shaped filter plate; 20. a connecting rod; 21. striking a ball; 22. an arc-shaped baffle plate; 23. fixing a column; 24. a third sliding plate; 25. the outer fishplate bar.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: a circular workpiece polishing device comprises an electric disc 1, a workpiece positioning cylinder 2 is rotatably arranged at the bottom of the electric disc 1, the bottom of the workpiece positioning cylinder 2 is movably connected with the top of a workpiece 3 to be polished, the bottom of the electric disc 1 is rotatably arranged at the top of a rotating plate 4, an elastic sheet is fixedly arranged between the outer wall of the rotating plate 4 and the outer wall of the bottom of the electric disc 1 and elastically connected with each other, the bottom of the rotating plate 4 is slidably arranged at the top of a first sliding rod 5, the bottom of the first sliding rod 5 is rotatably arranged at the top of a sliding block 6, the bottom of the sliding block 6 is slidably arranged on the outer wall of the top of a supporting plate 7, a polishing block 8 is embedded in the outer wall of the top of the supporting plate 7, an elastic sheet is fixedly arranged between the outer wall of the polishing block 8 and the outer wall of the sliding block 6 and elastically connected with each other, the elasticity of the elastic sheet between the outer wall of the rotating plate 4 and the outer wall of the electric disc 1 is larger than that between the polishing block 8 and the outer wall of the sliding block 6, the rotating plate 4 can be driven to rotate along with the rotation by the rotation of the electric disc 1, make rotor plate 4 drive a slide bar 5 wobbling range difference, the rotational speed is fast more, a slide bar 5's swing range is big more, slide bar 5 just can outwards promote slider 6, thereby it reduces the elasticity that sanding block 8 received to make slider 6 can stretch the shell fragment, thereby make sanding block 8 little less to circular workpiece's pressure, because the rotational speed is fast more and need not sanding block 8 with very big pressure alright polish circular workpiece, thereby can effectual improvement sanding block 8's life.

As shown in figures 2 and 6, in the invention, a partition plate 9 is fixedly arranged on the inner wall of a grinding block 8, a cavity formed between the right side of the partition plate 9 and the inner wall of the grinding block 8 is filled with cooling liquid, a fixing plate 10 is penetrated and fixedly arranged on the partition plate 9, the fixing plate 10 is embedded on the inner wall of the left end of the grinding block 8, a first sliding plate 12 is slidably arranged on the outer wall of the top of the fixing plate 10, the outer wall of the first sliding plate 12 is embedded and fixedly arranged at one end of a connecting plate 13, the connecting plate 13 is penetrated and slidably arranged on the partition plate 9, the other end of the connecting plate 13 is embedded and fixedly arranged on the outer wall of a second sliding plate 14, the second sliding plate 14 is slidably arranged on the outer wall of the fixing plate 10, a spring plate elastic connection is fixedly arranged between the outer wall of the right end of the second sliding plate 14 and the inner wall of the right end of the grinding block 8, a liquid passing plate 15 is penetrated and fixedly arranged on the partition plate 9, the left end of the liquid passing plate 15 is embedded and communicated with a cambered hollow plate 11, the left upper end of the liquid passing plate 15 is embedded and communicated with the cambered hollow plate, the top of the arc-shaped hollow plate 11 penetrates through the fixing plate 10, the electric disc 1 is rotated to polish the circular workpiece through the polishing block 8, the polishing positions of the polishing block 8 and the circular workpiece can generate heat through friction, the temperature of a space formed by the left side of the first sliding plate 12 and the fixing plate 10 is heated, and the thermal expansion effect is caused, then the first sliding plate 12 moves rightwards due to thermal expansion, the first sliding plate 12 pushes the connecting plate 13 to move rightwards, the connecting plate 13 can continuously push the second sliding plate 14 to move rightwards, the second sliding plate 14 can extrude cooling liquid to the inside of the liquid passing plate 15, so that the cooling liquid passing through the liquid passing plate 15 is extruded to flow out from the polishing positions of the polishing block 8 and the circular workpiece, and the automatic cooling effect is achieved.

As shown in figures 2, 3, 4 and 5, in the invention, a second sliding rod 16 is penetrated and slidably mounted on a fixed plate 10, the top of the second sliding rod 16 is provided with a triangular conical surface, the second sliding rod 16 is penetrated and slidably mounted on a liquid passing plate 15 and a grinding block 8, an extrusion rod 17 is embedded in the outer wall of the second sliding rod 16, an impact ball 21 is movably mounted in the second sliding rod 16, the bottom of the extrusion rod 17 is movably connected with the top of a semicircular lug 18, the bottom of the semicircular lug 18 is embedded in the outer wall of the top of an arc-shaped filter plate 19, the outer wall of the arc-shaped filter plate 19 is movably mounted on the inner wall of an arc-shaped baffle plate 22, the arc-shaped filter plate 19 is embedded in a connecting rod 20, the connecting rod 20 is embedded in the outer wall of a supporting plate 7, when the first sliding plate 12 moves rightwards due to heat, the first sliding plate 12 can extrude the triangular conical surface at the top of the second sliding rod 16 outwards, and the second sliding rod 16 can be extruded and moved by the first sliding plate 12, slide bar 16 drives the extrusion stem 17 and follows outward movement together, and extrusion stem 17 just can carry out the effect of an striking to semicircular convex block 18, make semicircular convex block 18 drive ARC filter 19 and produce the vibration, thereby can accelerate the separation of coolant liquid and residue, improve the filter effect, move the in-process of vibration at slide bar 16 No. two simultaneously, the inside impact ball 21 of slide bar 16 also can be in slide bar 16 inside striking vibration No. two, thereby make slide bar 16 No. two can produce the self-oscillation and shake the adnexed dust on the outer wall off, and the service life is prolonged.

As shown in figure 1, in the invention, the outer wall of the top of the arc baffle 22 is embedded and fixed on the outer wall of the bottom of the fixed column 23, the outer wall of the top of the fixed column 23 is embedded and fixed on the outer wall of the bottom of the third sliding plate 24, the third sliding plate 24 is slidably mounted on the outer connecting plate 25, the outer connecting plate 25 is rotatably mounted on the outer wall of the rotating plate 4, through the arrangement of the arc baffle 22 and the arc filter plate 19, the arc baffle 22 can achieve the effect of blocking and collecting abraded residues, the arc filter plate 19 can achieve the effect of separating the residues from cooling liquid, so that a worker can conveniently collect the cooling liquid, meanwhile, according to different rotating speeds of the electric disc 1, the rotating plates 4 have different swinging amplitudes, the rotating speed is faster, the swinging amplitude of the rotating plate 4 is larger, the rotating plate 4 can drive the outer connecting plate 25 to move upwards, the outer connecting plate 25 can lift the fixed column 23 upwards through the third sliding plate 24, the fixing column 23 can lift the arc-shaped baffle plate 22 upwards, so that residues with larger flying range caused by the increase of the rotating speed can be blocked, and the blocking efficiency of the arc-shaped baffle plate 22 is improved.

When the polishing device works (or is used), a workpiece 3 to be polished is fixed on the workpiece positioning cylinder 2, then the electric disc 1 rotates to drive the polishing block 8 to rotate to polish, the rotating plate 4 can be driven to rotate along with the rotation of the electric disc 1, the sliding plate 4 can drive the first sliding rod 5 to rotate along with the rotation, different rotating speeds of the electric disc 1 can deal with round workpieces with different roughness degrees, centrifugal forces generated by the electric discs 1 with different rotating speeds are different, so that the rotating plate 4 drives the first sliding rod 5 to swing in different amplitudes, the higher the rotating speed is, the larger the swinging amplitude of the first sliding rod 5 is, the sliding rod 5 can push the sliding block 6 outwards, the sliding block 6 can stretch the elastic sheet to reduce the elastic force borne by the polishing block 8, the smaller the pressure of the polishing block 8 on the round workpieces is, and the round workpieces can be polished without the large pressure of the polishing block 8 due to the higher rotating speed is, thereby effectively prolonging the service life of the sanding block 8; the round workpiece is ground by the grinding block 8 rotating along with the electric disc 1, so that the grinding position of the grinding block 8 and the round workpiece can generate heat through friction, the temperature of a space formed by the left side of the first sliding plate 12 and the fixing plate 10 is heated, a thermal expansion effect is caused, then the first sliding plate 12 moves rightwards due to the thermal expansion, the first sliding plate 12 pushes the connecting plate 13 to move rightwards, the connecting plate 13 can continuously push the second sliding plate 14 to move rightwards, the second sliding plate 14 can extrude cooling liquid to the inside of the liquid passing plate 15, and the cooling liquid of the liquid passing plate 15 is extruded to flow out from the grinding position of the grinding block 8 and the round workpiece, and an automatic cooling effect is achieved; by arranging the arc-shaped baffle plate 22 and the arc-shaped filter plate 19, the arc-shaped baffle plate 22 can achieve the effect of blocking and collecting milled and overflowed residues, the arc-shaped filter plate 19 can achieve the effect of separating the residues from cooling liquid, and is convenient for workers to collect the cooling liquid, meanwhile, according to different rotating speeds of the electric disc 1, the rotating plates 4 are different in swinging amplitude, the rotating speed is higher, the swinging amplitude of the rotating plates 4 is larger, so that the rotating plates 4 can rotate to drive the outer connecting plate 25 to move upwards, the outer connecting plate 25 can lift the fixing column 23 upwards through the third sliding plate 24, the fixing column 23 can lift the arc-shaped baffle plate 22 upwards, the residues with the overflowed range larger due to the increase of the rotating speed can be blocked, and the blocking efficiency of the arc-shaped baffle plate 22 is improved; when the first sliding plate 12 moves rightwards due to thermal expansion, the first sliding plate 12 can extrude a triangular conical surface at the top of the second sliding rod 16, the second sliding rod 16 can be extruded and moved outwards by the first sliding plate 12, the second sliding rod 16 drives the extrusion rod 17 to move outwards along with the extrusion rod, the extrusion rod 17 can impact the semicircular lug 18, so that the semicircular lug 18 drives the arc-shaped filter plate 19 to vibrate, separation of cooling liquid and residues can be accelerated, the filtering effect is improved, meanwhile, in the moving and vibrating process of the second sliding rod 16, the impact ball 21 inside the second sliding rod 16 can impact and vibrate inside the second sliding rod 16, so that the second sliding rod 16 can shake by itself to shake dust attached to the outer wall, the service life is prolonged, and in conclusion, the electric disc 1 with different rotating speeds controls the force of the grinding block 8 on the circular workpiece to be ground, and can add the coolant liquid automatically according to the themogenesis principle of friction in the process of polishing, reach automatically cooling's effect, can play fine splashproof simultaneously through cowl 22 and arc filter 19 and filter the function of collecting.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a circular workpiece grinding device, includes electronic disc (1), its characterized in that: the electric grinding machine is characterized in that a workpiece positioning barrel (2) is installed at the bottom of the electric disc (1) in a rotating mode, the bottom of the workpiece positioning barrel (2) is movably connected with the top of a workpiece (3) to be ground, the bottom of the electric disc (1) is rotatably installed at the top of the rotating plate (4), an elastic piece elastic connection is fixedly installed between the outer wall of the bottom of the rotating plate (4) and the outer wall of the bottom of the electric disc (1), the bottom of the rotating plate (4) is slidably installed at the top of the first sliding rod (5), the bottom of the first sliding rod (5) is rotatably installed at the top of the sliding block (6), the bottom of the sliding block (6) is slidably installed on the outer wall of the top of the supporting plate (7), a grinding block (8) is fixedly embedded in the outer wall of the top of the supporting plate (7), and an elastic piece elastic connection is fixedly installed between the outer wall of the grinding block (8) and the outer wall of the sliding block (6).

2. A round workpiece grinding apparatus as defined in claim 1 wherein: fixed mounting has baffle (9) on sanding block (8) inner wall, the cavity that forms between the right-hand and sanding block (8) inner wall of baffle (9) is filled the coolant liquid, run through and fixed mounting has fixed plate (10) on baffle (9), fixed plate (10) are embedded and are fixed on sanding block (8) left end inner wall.

3. A round workpiece grinding apparatus as set forth in claim 2, wherein: fixed plate (10) top outer wall slidable mounting has slide (12) No. one, slide (12) outer wall inlays admittedly in connecting plate (13) one end, connecting plate (13) run through and slidable mounting on baffle (9), the connecting plate (13) other end inlays admittedly on No. two slide (14) outer walls, No. two slide (14) slidable mounting is on fixed plate (10) outer wall, fixed mounting has shell fragment elastic connection between No. two slide (14) right-hand member outer walls and sanding block (8) right-hand member inner wall.

4. A round workpiece grinding apparatus as set forth in claim 2, wherein: run through and fixed mounting has logical liquid board (15) on baffle (9), lead to liquid board (15) left end and inlay on sanding block (8) and communicate, lead to liquid board (15) upper left end and inlay inherent arc hollow slab (11) and communicate, arc hollow slab (11) top pierces through in fixed plate (10).

5. A round workpiece grinding apparatus as set forth in claim 2, wherein: run through and slidable mounting has No. two slide bars (16) on fixed plate (10), No. two slide bar (16) tops set up to the triangle conical surface, No. two slide bars (16) run through and slidable mounting on leading to liquid board (15) and sanding block (8), No. two slide bar (16) outer wall inlays and is fixed with squeeze bar (17), No. two inside movable mounting of slide bar (16) has impact ball (21).

6. A round workpiece grinding apparatus as defined in claim 5 wherein: the bottom of the extrusion rod (17) is movably connected with the top of the semicircular convex block (18), the bottom of the semicircular convex block (18) is fixedly embedded on the outer wall of the top of the arc-shaped filter plate (19), the outer wall of the arc-shaped filter plate (19) is movably installed on the inner wall of the arc-shaped baffle plate (22), the arc-shaped filter plate (19) is fixedly embedded on the connecting rod (20), and the connecting rod (20) is fixedly embedded on the outer wall of the supporting plate (7).

7. A round workpiece grinding apparatus as defined in claim 6 wherein: the outer wall of the top of the arc-shaped baffle (22) is fixedly embedded on the outer wall of the bottom of the fixed column (23), the outer wall of the top of the fixed column (23) is fixedly embedded on the outer wall of the bottom of the third sliding plate (24), the third sliding plate (24) is slidably mounted on the outer connecting plate (25), and the outer connecting plate (25) is rotatably mounted on the outer wall of the rotating plate (4).