An intelligent water pressure test device for the production of pot-type insulators

Abstract

The present invention belongs to the technical field of pot insulators, and specifically discloses an intelligent hydrostatic test device for the production of pot insulators, including a device main body. A hydrostatic test mechanism is arranged at the top of the device main body. A workbench is arranged directly below the hydrostatic test mechanism. An L-shaped bracket is installed on the side of the workbench. A main body pillar is arranged at the middle end of the L-shaped bracket. A main body turntable is rotatably installed at the top of the main body pillar. A work turntable is fixedly installed at the top of the main body turntable. Six test bins are evenly arranged on the end face at the top of the work turntable. A driving mechanism is arranged on the surface of the L-shaped bracket and on the side of the main body pillar. A positioning mechanism is arranged inside the device main body. By setting the driving mechanism and the positioning mechanism, the present invention can realize continuous and stable material conveying, greatly improve the work efficiency, and the pot insulator can be horizontally and stably installed in the test bin to ensure the accuracy of test data.

Description

Technical Field

[0001] The present invention belongs to the field of pot insulators, and specifically discloses an intelligent water pressure test device for the production of pot insulators. Background Art

[0002] Pot insulators are generally formed by gluing or mechanically clamping insulating parts and metal accessories with an adhesive. Insulators are widely used in the power system and generally belong to external insulation, operating under atmospheric conditions. Overhead transmission lines, busbars of power plants and substations, and external live conductors of various electrical equipment must be supported by insulators and insulated from the ground or other conductors with potential differences.

[0003] In the existing water pressure test device for the production of pot insulators, when testing a batch of pot insulators, it is necessary to wait for the previous pot insulator test to be completed, and then the staff disassemble the tested pot insulator, and then the next pot insulator can be installed for testing. The continuity of the device is poor, and when testing the pot insulator, the stability of the pot insulator is poor and it is easy to shake, affecting the accuracy of the test data. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an intelligent water pressure test device for the production of pot insulators, so as to solve the problems in the prior art that when testing a batch of pot insulators, it is necessary to wait for the previous pot insulator test to be completed, and then the staff disassemble the tested pot insulator, and then the next pot insulator can be installed for testing. The continuity of the device is poor, and when testing the pot insulator, the stability of the pot insulator is poor and it is easy to shake, affecting the accuracy of the test data.

[0005] To achieve the above purpose, the present invention provides an intelligent water pressure test device for the production of pot insulators, including a device main body. A water pressure test mechanism is arranged at the top of the device main body. A workbench is arranged directly below the water pressure test mechanism. An L-shaped bracket is installed on the side of the workbench. A main body pillar is arranged in the middle of the L-shaped bracket. A main body turntable is rotatably installed at the top of the main body pillar. A work turntable is fixedly installed on the top of the main body turntable. Six test chambers are evenly arranged on the top end face of the work turntable. The end of the work turntable is above the workbench. The six test chambers are sequentially rotatably arranged above the workbench, and the test chambers above the workbench correspond to the water pressure test mechanism. Six convex columns are evenly arranged on the bottom end face of the main body turntable. The six convex columns respectively correspond to the six test chambers. A driving mechanism is arranged on the surface of the L-shaped bracket and on the side of the main body pillar. The driving mechanism cooperates with the main body turntable through the convex columns. A positioning mechanism is arranged inside the device main body.

[0006] In the above technical solution, preferably, the hydrostatic test mechanism includes a downward pressing cylinder, the output end of the downward pressing cylinder is connected with a frame box, a high-pressure water gun is installed inside the frame box, and the high-pressure water gun is connected to a water tank outside the equipment main body through a water pipe.

[0007] In the above technical solution, preferably, the test chamber includes an outer cover plate, a tray is arranged in the inner cavity of the outer cover plate, both the outer cover plate and the tray are fixedly installed on the surface of the working turntable, and a pot insulator is placed on the top of the tray.

[0008] In the above technical solution, preferably, the driving mechanism includes a collar, the collar is movably sleeved on the surface of the main body support column, and the collar is located below the main body turntable. An extension rod is fixedly installed on the surface of the collar. A convex groove is opened in the middle of the extension rod, a receiving groove is opened on the surface of the convex groove, a spring is installed inside the receiving groove, a stopper is installed at the top end of the spring, the shape of the stopper matches the shape of the convex groove, an arc angle is arranged at the end with a smaller width of the stopper, the convex groove cooperates with the convex column, and the extension rod is located behind the rotation direction of one of the convex columns. A mating column is arranged at the end of the extension rod, a cylinder is arranged on the side surface of the main body support column, an operating rod is installed at the output end of the cylinder, a movable square groove is opened at the end of the operating rod close to the cylinder, and the surface of the mating column is movably installed in the movable square groove.

[0009] In the above technical solution, preferably, a first movable groove is opened inside the equipment main body, a second movable groove is arranged at the top of the first movable groove, the other end of the operating rod penetrates through the workbench and is inserted into the first movable groove. The positioning mechanism includes a first frame plate, a first frame plate is fixedly connected to the end of the operating rod inside the first movable groove, a top rod is movably arranged inside the second movable groove, a second frame plate is fixedly arranged at the bottom of the top rod, a connecting frame is connected between the first frame plate and the second frame plate through a rotating shaft, a slot is arranged at one end of the top of the second movable groove, a rotating column is rotatably arranged inside the slot, a third frame plate is installed at the top of the top rod through a rotating shaft, the other end of the third frame plate is fixedly connected to the rotating column, a support frame is fixedly installed at the other end of the rotating column, a pressing plate is arranged on the surface of the support frame, the pressing plate movably presses on the top of the test chamber, a test hole is opened in the middle of the pressing plate, and a blocking frame is arranged on the top of the pressing plate and outside the test hole.

[0010] In the above technical solution, preferably, inner wall blocks are installed on the inner walls of the first movable slot and the second movable slot. T-shaped sliding slots are formed on the surfaces of the inner wall blocks. T-shaped sliding blocks are installed on the surface of the ejector rod near the bottom. The T-shaped sliding blocks are slidably installed in the T-shaped sliding slots.

[0011] In the above technical solution, preferably, the width of the movable square slot is twice the diameter of the matching column.

[0012] In the above technical solution, preferably, a limiting slot is formed inside the working turntable and directly below the tray. A limiting disk is movably arranged inside the limiting slot. A top column is fixedly installed in the middle of the limiting disk. The top column movably penetrates through the working turntable. A supporting platform is arranged on the surface of the L-shaped bracket. The end face of the supporting platform is an arc surface. A matching sliding slot is arranged on the surface of the workbench. The matching sliding slot is matched with the top column.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] Through the cooperation of the main turntable, the working turntable and the driving mechanism, the main turntable will rotate intermittently. In this way, continuous and stable material transportation can be achieved, saving the operation time of the staff, greatly improving the work efficiency, facilitating the test of a batch of pot-type insulators. At the same time, under the action of the positioning mechanism, it is ensured that the pot-type insulator can be horizontally and stably installed in the test chamber during the test, ensuring the accuracy of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 is a sectional view of the overall partial structure of the present invention;

[0017] Figure 3 is of the present invention Figure 2 structural diagram from another perspective;

[0018] Figure 4 is a schematic front view of the overall structure of the present invention;

[0019] Figure 5 is of the present invention Figure 3 enlarged view at A in;

[0020] Figure 6 is of the present invention Figure 2 enlarged view at B in;

[0021] Figure 7 is of the present invention Figure 4 enlarged view at C in;

[0022] Figure 8 For the present invention Figure 2 an enlarged view of the D position in

[0023] Figure 9 For the present invention Figure 2 an enlarged view of the E position in

[0024] In the figure: 1, equipment main body; 2, workbench; 3, L-shaped bracket; 4, main body pillar; 5, main body turntable; 6, convex column; 7, work turntable; 8, test chamber; 9, drive mechanism; 10, positioning mechanism; 11, collar; 12, extending rod; 13, convex groove; 14, stopper; 15, mating column; 16, operating rod; 17, cylinder; 18, movable square groove; 19, first movable groove; 20, second movable groove; 21, first frame plate; 22, connecting frame; 23, second frame plate; 24, inner wall block; 25, T-shaped slider; 26, rotating column; 27, third frame plate; 28, ejector rod; 29, support frame; 30, pressing plate; 31, test hole; 32, retaining frame; 33, tray; 34, outer cover plate; 35, ejector post; 36, limiting disc; 37, limiting groove; 38, supporting and towing table; 39, mating sliding groove. Detailed implementation manners

[0025] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0026] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the limitations of the specific embodiments disclosed below.

[0027] Such as Figure 1 - Figure 9An intelligent water pressure test device for the production of pot-type insulators shown, including a device main body 1. A water pressure test mechanism is arranged at the top of the device main body 1. A workbench 2 is arranged directly below the water pressure test mechanism. An L-shaped bracket 3 is installed on the side of the workbench 2. A main body support column 4 is arranged in the middle of the L-shaped bracket 3. A main body turntable 5 is rotatably installed at the top of the main body support column 4. A work turntable 7 is fixedly installed at the top of the main body turntable 5. Six test bins 8 are evenly arranged on the end face of the top of the work turntable 7. The end of the work turntable 7 is above the workbench 2. The six test bins 8 are sequentially rotatably arranged above the workbench 2, and the test bin 8 above the workbench 2 corresponds to the water pressure test mechanism. Six convex columns 6 are evenly arranged on the bottom end face of the main body turntable 5. The six convex columns 6 respectively correspond to the six test bins 8. A driving mechanism 9 is arranged on the surface of the L-shaped bracket 3 and on the side of the main body support column 4. The driving mechanism 9 cooperates with the main body turntable 5 through the convex columns 6. A positioning mechanism 10 is arranged inside the device main body 1. Through the cooperation of the main body turntable 5, the work turntable 7 and the driving mechanism 9, the main body turntable 5 will rotate intermittently. In this way, continuous and stable material transportation can be realized. At the same time, under the action of the positioning mechanism 10, it is ensured that during the test, the pot-type insulator can be horizontally and stably installed in the test bin 8, ensuring the accuracy of the water pressure test of the pot-type insulator by the water pressure test mechanism.

[0028] The water pressure test mechanism includes a downward pressing air cylinder. The output end of the downward pressing air cylinder is connected with a frame box. A high-pressure water gun is installed inside the frame box. The high-pressure water gun is connected to a water tank outside the device main body 1 through a water pipe. The downward pressing air cylinder can drive the frame box and the high-pressure water gun to move downward so as to cooperate with the test bin 8 directly below to realize the water pressure test of the pot-type insulator.

[0029] The test bin 8 includes an outer cover plate 34. A tray 33 is arranged in the inner cavity of the outer cover plate 34. Both the outer cover plate 34 and the tray 33 are fixedly installed on the surface of the work turntable 7. A pot-type insulator is placed on the top of the tray 33. The staff can place the pot-type insulator inside the tray 33, and the open end of the pot-type insulator faces directly upward.

[0030] The driving mechanism 9 includes a collar 11. The collar 11 is movably sleeved on the surface of the main body strut 4, and the collar 11 is located below the main body turntable 5. A protruding rod 12 is fixedly installed on the surface of the collar 11. A convex groove 13 is provided in the middle of the protruding rod 12. A receiving groove is provided on the surface of the convex groove 13. A spring is installed inside the receiving groove. The top of the spring is provided with a stopper 14. The shape of the stopper 14 matches the shape of the convex groove 13. An arc-shaped corner is provided at the end with a smaller width of the stopper 14. The convex groove 13 cooperates with the convex column 6, and the protruding rod 12 is located behind the rotation direction of one of the convex columns 6. A mating column 15 is provided at the end of the protruding rod 12. A cylinder 17 is provided on the side of the main body strut 4. An operating rod 16 is installed at the output end of the cylinder 17. An activity square groove 18 is provided at the end of the operating rod 16 close to the cylinder 17. The surface of the mating column 15 is movably installed in the activity square groove 18. When the cylinder 17 extends to drive the operating rod 16 to move forward, the inner wall of the activity square groove 18 has a forward pushing effect on the mating column 15. And under the action of the collar 11, during the forward movement of the operating rod 16, the protruding rod 12 will rotate counterclockwise with the collar 11 as the center. At this moment, the end with a wider width of the stopper 14 has a forward pushing effect on the convex column 6 in front of its rotation direction, so that the main body turntable 5 will rotate counterclockwise by sixty degrees. Then when the cylinder 17 contracts to drive the operating rod 16 to move backward, the inner wall of the activity square groove 18 has a backward pulling effect on the mating column 15. The protruding rod 12 will rotate clockwise with the collar 11 as the center. And during the rotation process, the end with a smaller width of the stopper 14 has a squeezing effect on the next convex column 6. Under the action of the arc-shaped corner, the stopper 14 will contract into the receiving groove, so that the protruding rod 12 will move to the rear of the next convex column 6.

[0031] The interior of the device main body 1 is provided with a first movable slot 19. The top of the first movable slot 19 is provided with a second movable slot 20. The other end of the operating rod 16 penetrates through the workbench 2 and is inserted into the first movable slot 19. The positioning mechanism 10 includes a first frame plate 21. One end of the operating rod 16 inside the first movable slot 19 is fixedly connected to the first frame plate 21. A ejector rod 28 is movably arranged inside the second movable slot 20. A second frame plate 23 is fixedly arranged at the bottom of the ejector rod 28. A connecting frame 22 is connected between the first frame plate 21 and the second frame plate 23 through a rotating shaft. One end of the top of the second movable slot 20 is provided with a slot. A rotating column 26 is rotatably arranged inside the slot. The top of the ejector rod 28 is installed with a third frame plate 27 through a rotating shaft. The other end of the third frame plate 27 is fixedly connected to the rotating column 26. The other end of the rotating column 26 is fixedly installed with a support frame 29. A pressing plate 30 is arranged on the surface of the support frame 29. The pressing plate 30 is movably pressed on the top of the test chamber 8. When the cylinder 17 extends and drives the operating rod 16 to move forward, the operating rod 16 will drive the first frame plate 21 to move deeper into the first movable slot 19. Under the action of the connecting frame 22, the ejector rod 28 will move downward, and the ejector rod 28 will also drive the rotating column 26 to rotate clockwise through the third frame plate 27. At this time, the pressing plate 30 on the other side of the rotating column 26 will lift upward. When the cylinder 17 contracts and drives the operating rod 16 to move backward, the operating rod 16 will drive the first frame plate 21 to move backward. Under the action of the connecting frame 22, the ejector rod 28 will move upward, and the ejector rod 28 will also drive the rotating column 26 to rotate counterclockwise through the third frame plate 27. At this time, the pressing plate 30 on the other side of the rotating column 26 will move downward until it presses on the top of the pot-type insulator directly below the hydrostatic test mechanism, playing a role in positioning the pot-type insulator and ensuring the stability of the pot-type insulator during testing. A test hole 31 is opened in the middle of the pressing plate 30. A blocking frame 32 is arranged on the top of the pressing plate 30 and outside the test hole 31. The hydrostatic test mechanism can cooperate with the test hole 31 and the blocking frame 32 to protect the pot-type insulator while performing a hydrostatic test on it.

[0032] Inner wall blocks 24 are installed on the inner walls of the first movable slot 19 and the second movable slot 20. T-shaped sliding grooves are opened on the surfaces of the inner wall blocks 24. A T-shaped sliding block 25 is installed on the surface of the ejector rod 28 near the bottom. The T-shaped sliding block 25 is slidably installed in the T-shaped sliding groove. Through the cooperation of the T-shaped sliding block 25 and the T-shaped sliding groove, the stability of the ejector rod 28 during up and down movement can be ensured, improving the practicability of the device.

[0033] The width of the movable square slot 18 is twice the diameter of the matching column 15. When the cylinder 17 extends and drives the operating rod 16 to move forward, first, the operating rod 16 will move forward a certain distance. At this time, the operating rod 16 will drive the positioning mechanism 10 to move upward, and the pressing plate 30 will flip upward a certain distance, avoiding the problem that the pressing plate 30 will cause wear on the surface of the pot-type insulator when the driving mechanism 9 drives the working turntable 7 to rotate.

[0034] Inside the working turntable 7 and directly below the tray 33, a limiting groove 37 is provided. A limiting disc 36 is movably arranged inside the limiting groove 37. A top column 35 is fixedly installed in the middle of the limiting disc 36. The top column 35 movably penetrates through the working turntable 7. A supporting and towing platform 38 is arranged on the surface of the L-shaped bracket 3. The end face of the supporting and towing platform 38 is an arc surface. A matching sliding groove 39 is arranged on the surface of the workbench 2. The matching sliding groove 39 cooperates with the top column 35. When one of the test bins 8 at the top of the working turntable 7 rotates to the end of the L-shaped bracket 3, the supporting and towing platform 38 has an upward pushing effect on the top column 35, so that the top column 35 can lift the pot-type insulator inside the tray 33, facilitating the staff to take out the pot-type insulator.

[0035] Working principle: First, the staff places the pot-type insulator inside the tray 33 near the end of the L-shaped bracket 3, and makes the open end of the pot-type insulator face directly upward. Then the air cylinder 17 extends, driving the operating rod 16 to move forward. The inner wall of the movable square groove 18 has a forward pushing effect on the matching column 15. And under the action of the collar 11, when the operating rod 16 moves forward, the extending rod 12 will rotate counterclockwise with the collar 11 as the center. At this moment, the wider end of the stopper 14 has a forward pushing effect on the convex column 6 in front of its rotation direction, so that the main turntable 5 will rotate counterclockwise by sixty degrees. In this way, continuous and stable material transportation can be realized, greatly improving the work efficiency. At the same time, the operating rod 16 will drive the first frame plate 21 to move deeper into the first movable groove 19. Under the action of the connecting frame 22, the ejector rod 28 will move downward, and the ejector rod 28 will also drive the rotating column 26 to rotate clockwise through the third frame plate 27. At this time, the pressing plate 30 on the other side of the rotating column 26 will lift upward, which can avoid the problem that the pressing plate 30 will cause wear on the surface of the pot-type insulator when the driving mechanism 9 drives the working turntable 7 to rotate. Then the air cylinder 17 contracts, driving the operating rod 16 to move backward. The inner wall of the movable square groove 18 has a backward pulling effect on the matching column 15. The extending rod 12 will rotate clockwise with the collar 11 as the center. And during the rotation process, the narrower end of the stopper 14 has a squeezing effect on the next convex column 6. Under the action of the arc angle, the stopper 14 will contract into the storage groove, so that the extending rod 12 will move to the rear of the next convex column 6. At the same time, the operating rod 16 will drive the first frame plate 21 to move backward. Under the action of the connecting frame 22, the ejector rod 28 will move upward, and the ejector rod 28 will also drive the rotating column 26 to rotate counterclockwise through the third frame plate 27. At this time, the pressing plate 30 on the other side of the rotating column 26 will move downward until it presses on the top of the pot-type insulator directly below the hydrostatic test mechanism, playing a role in positioning the pot-type insulator and ensuring the stability of the pot-type insulator during the test. Finally, the pressing air cylinder can drive the frame box and the high-pressure water gun to move downward, so that they cooperate with the test bin 8 directly below to realize the hydrostatic test of the pot-type insulator.

[0036] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. An intelligent water pressure test equipment for pot-type insulator production, comprising an equipment body (1), characterized in that: A water pressure test mechanism is arranged on the top of the equipment body (1), a workbench (2) is arranged directly below the water pressure test mechanism, an L-shaped bracket (3) is installed on the side of the workbench (2), a main body support (4) is arranged at the middle end of the L-shaped bracket (3), a main body turntable (5) is rotatably installed on the top of the main body support (4), a working turntable (7) is fixedly installed on the top of the main body turntable (5), six test chambers (8) are evenly arranged on the end surface of the top of the working turntable (7), the end of the working turntable (7) is located above the workbench (2), the six test chambers (8) are rotatably arranged above the workbench (2), and the test chambers (8) located above the workbench (2) correspond to the water pressure test mechanism, and the end surface of the bottom of the main body turntable (5) is evenly arranged Six convex columns (6) are provided, and the six convex columns (6) correspond to the six test chambers (8) respectively. A driving mechanism (9) is provided on the surface of the L-shaped bracket (3) and on the side of the main body support (4). The driving mechanism (9) cooperates with the main body turntable (5) through the convex columns (6). A positioning mechanism (10) is provided inside the device body (1). The driving mechanism (9) comprises a collar (11). The collar (11) is movably sleeved on the surface of the main body support (4), and the collar (11) is located below the main body turntable (5). A protruding rod (12) is fixedly installed on the surface of the collar (11). A convex groove (13) is provided at the middle end of the protruding rod (12). A receiving groove is provided on the surface of the convex groove (13). A spring is installed inside the receiving groove, and a spring is installed at the top end of the spring. A stopper (14) is provided, wherein the shape of the stopper (14) matches the shape of the convex groove (13), an arc angle is provided at one end of the stopper (14) with a smaller width, the convex groove (13) matches the convex column (6), and the extension rod (12) is located behind one of the convex columns (6) in the rotation direction, a matching column (15) is provided at the end of the extension rod (12), a cylinder (17) is provided on the side of the main support column (4), an operating rod (16) is installed at the output end of the cylinder (17), a movable square groove (18) is provided at one end of the operating rod (16) close to the cylinder (17), a surface of the matching column (15) is movably installed in the movable square groove (18), a first movable groove (19) is provided inside the device body (1), and the top of the first movable groove (19) is provided. A second movable groove (20) is provided at the bottom, the other end of the operating rod (16) passes through the workbench (2) and is inserted into the first movable groove (19), the positioning mechanism (10) comprises a first frame plate (21), one end of the operating rod (16) located inside the first movable groove (19) is fixedly connected to the first frame plate (21), a top rod (28) is movably provided inside the second movable groove (20), a second frame plate (23) is fixedly provided at the bottom of the top rod (28), a connecting frame (22) is connected between the first frame plate (21) and the second frame plate (23) via a rotating shaft, a slot is provided at one end of the top of the second movable groove (20), a rotating column (26) is rotatably provided inside the slot, and a third frame plate (27) is installed at the top of the top rod (28) via a rotating shaft,The other end of the third frame plate (27) is fixedly connected to the rotating column (26), and a support frame (29) is fixedly installed on the other end of the rotating column (26). A pressing plate (30) is arranged on the surface of the supporting frame (29), and the pressing plate (30) is movably pressed on the top of the test chamber (8). A test hole (31) is opened at the middle end of the pressing plate (30), and a retaining frame (32) is arranged on the top of the pressing plate (30) and on the outside of the test hole (31).

2. The intelligent water pressure test equipment for pot-type insulator production according to claim 1 is characterized in that: The water pressure test mechanism comprises a downward pressure cylinder, the output end of which is connected to a frame box, a high-pressure water gun is installed inside the frame box, and the high-pressure water gun is connected to a water tank outside the device body (1) through a water pipe.

3. The intelligent water pressure test equipment for pot-type insulator production according to claim 1 is characterized in that: The test chamber (8) comprises an outer cover plate (34), a tray (33) is arranged in the inner cavity of the outer cover plate (34), the outer cover plate (34) and the tray (33) are both fixedly mounted on the surface of the working turntable (7), and a pot-type insulator is placed on the top of the tray (33).

4. The intelligent water pressure test equipment for pot-type insulator production according to claim 1 is characterized in that: An inner wall block (24) is installed on the inner wall of the first movable groove (19) and the second movable groove (20), and a T-shaped sliding groove is provided on the surface of the inner wall block (24). A T-shaped sliding block (25) is installed on the surface of the top rod (28) close to the bottom, and the T-shaped sliding block (25) is slidably installed in the T-shaped sliding groove.

5. The intelligent water pressure test equipment for pot-type insulator production according to claim 1 is characterized in that: The width of the movable square groove (18) is twice the diameter of the matching column (15).

6. The intelligent water pressure test equipment for pot-type insulator production according to claim 3 is characterized in that: A limiting groove (37) is provided inside the working turntable (7) and directly below the tray (33); a limiting plate (36) is movably provided inside the limiting groove (37); a top column (35) is fixedly installed in the middle of the limiting plate (36); the top column (35) movably passes through the working turntable (7); a supporting platform (38) is provided on the surface of the L-shaped bracket (3); an end surface of the supporting platform (38) is provided as an arc surface; a matching slide groove (39) is provided on the surface of the working table (2); the matching slide groove (39) matches with the top column (35).

Images