Hub machining rotary table tool for hub production

Abstract

The hub machining rotary table tool for hub production comprises a base, stand columns are fixedly connected to the four ends of the upper portion of the base, a rotary table is fixedly connected to the tops of the stand columns, a first clamping table is fixedly connected to the position, close to the front ends of the stand columns, of the base, and a fixing column is fixedly connected to the right side of the upper end of the base; according to the hub clamping device, the fixed first clamping table and the movable second clamping table are arranged on the base, so that a hub can be positioned and clamped, and it is ensured that the circular disc can correspond to a cavity of the hub; the height of the circular disc can be adjusted through a second bidirectional screw, a threaded block and a connecting rod, the position of the circular disc can be adjusted through an air cylinder so that it can be ensured that the circular disc corresponds to the hub, the hub is positioned and clamped through an internal arc-shaped clamping plate, automatic overturning of the hub is completed through a worm and worm wheel structure, and the hub overturning efficiency is improved. Manual carrying is not needed, time and labor are saved, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of wheel hub processing, in particular to a wheel hub processing turntable tooling for wheel hub production. Background Art

[0002] In the past, most car wheel hub bearings were used in pairs of single-row tapered roller or ball bearings. With the development of technology, car wheel hub units have been widely used in cars. The scope and amount of use of wheel hub bearing units are increasing day by day, and they have developed to the third generation: the first generation is composed of double-row angular contact bearings. The second generation has a flange on the outer raceway for fixing the bearing, and the bearing can be simply put on the axle and fixed with nuts. This makes car maintenance easier. The third generation of wheel hub bearing units uses a combination of bearing units and anti-lock brake systems. The wheel hub unit is designed with an inner flange and an outer flange. The inner flange is fixed to the drive shaft with bolts, and the outer flange installs the entire bearing together;

[0003] Among them, patent number CN209036463U discloses a wheel hub processing turntable tooling for carbon fiber wheel hub production, which first processes the inside of the wheel hub. Before processing, the wheel hub is placed in the loading slot on the loading platform of the tooling platform, and the outer wall of the wheel hub can be fixed by operating the hydraulic push rod. The motor drives the loading platform to rotate through the rotating shaft, so that the inside of the wheel hub can be easily processed. When processing the outside of the wheel hub, the hydraulic telescopic rod is operated to drive the fastening device to move downward, and the wheel hub can be fixed from the inside through the fastening device. The electric telescopic rod is operated to drive the disc to move downward, and the moving distance of the electric telescopic rod is adjusted according to the size of the inner diameter of the wheel hub. The disc pushes the push rod to move to the outside of the shell, and the push rod pushes the movable rod out of the limit block, so that the fixed block fixes the inside of the wheel hub, and the hydraulic telescopic rod is operated again to move upward to raise the wheel hub, so that the outside of the wheel hub can be easily processed.

[0004] The above technical solution has certain defects when used: since the wheel hub has a certain weight and the workbench has a certain height from the ground, the wheel hub needs to be manually moved to the workbench, which requires a lot of labor during frequent processing, and it is impossible to fix wheels of various specifications, and the fixing effect is poor. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a wheel hub processing turntable tooling for wheel hub production, which solves the problems in the prior art that the wheel hub needs to be manually carried to the tooling table, frequent processing requires a lot of labor, and it is impossible to fix wheel hubs of various specifications, resulting in poor fixing effect.

[0007] (II) Technical solution

[0008] To achieve the above purpose, the present invention is implemented through the following technical solutions: a hub processing turntable tooling for hub production, comprising a base, four ends of the upper part of the base are fixedly connected with columns, the top of the column is fixedly connected with a rotating table, the base is fixedly connected with a clamping platform 1 near the front end of the column, the upper right side of the base is fixedly connected with a fixed column, the interior of the fixed column is movably connected with a connecting column, the other end of the connecting column is fixedly connected with a clamping platform 2, and the inner ends of the clamping platform 1 and the clamping platform 2 are both arc-shaped;

[0009] A rack is fixedly connected to one end of the outer side of the connecting column, a motor 6 is fixedly connected to one end of the outer side of the fixing column, a gear 3 is fixedly connected to the output end of the motor 6, a portion of the gear 3 is arranged inside the fixing column and meshes with the rack, a slide groove 2 is provided at the other end of the outer side of the connecting column, a slider 2 is fixedly connected to one end of the inner side of the fixing column, and the slider 2 is slidably connected inside the slide groove 2;

[0010] The rotating table is rotatably connected to a rotating shaft inside, a rotating member is fixedly connected to the rotating shaft, the outer end of the rotating member is fixedly connected to a connecting plate, the upper end of the connecting plate is fixedly connected to a mounting frame, the outer end of the mounting frame is fixedly connected to a motor three, the mounting frame is rotatably connected to a bidirectional screw two inside, the output end of the motor three is fixedly connected to the bidirectional screw two, the bidirectional screw two is threadedly connected to two threaded blocks, the upper end of the threaded block is rotatably connected to a connecting rod, the other end of the connecting rod is rotatably connected to a positioning plate, the upper four ends of the connecting plate are fixedly connected to telescopic rods, and the extending ends of the telescopic rods are fixedly connected to the bottom of the positioning plate.

[0011] Preferably: a rotating frame is fixedly connected above the positioning plate, a cylinder is rotatably connected inside the rotating frame, and a rotating end of the cylinder passes through the rotating frame and is fixedly connected to a second gear outwardly.

[0012] Preferably: a motor four is fixedly connected to the positioning plate, a gear one is fixedly connected to the output end of the motor four, and the gear one is meshed with the gear two.

[0013] Preferably: the extended end of the cylinder is provided with a circular disk, the inner top of the circular disk is fixedly connected to the motor five, the output end of the motor five is fixedly connected to the fixed disk, and the inner bottom of the circular disk is fixedly connected to three sets of fixing frames.

[0014] Preferably, the interior of the fixed frame is slidably connected to a movable frame, an upper end of the movable frame close to the fixed plate is fixedly connected to a sliding column, an arc groove is provided on the fixed plate, and the sliding column is slidably connected inside the arc groove.

[0015] Preferably: a slider is fixedly connected to one end of the movable frame away from the fixed disk, a slide groove is provided at the outer end of the circular disk, and the slider passes through the slide groove and is fixedly connected to an arc-shaped clamping plate outwardly.

[0016] Preferably: one end of the outer side of the rotating table is fixedly connected to a U-shaped frame, the top of the U-shaped frame is fixedly connected to a motor 1, the output end of the motor 1 passes through the U-shaped frame and is provided with a worm inwardly, the outer end of the rotating shaft is fixedly connected to a worm wheel, and the worm and the worm wheel are meshed with each other.

[0017] Preferably: a mounting plate is fixedly connected to one end above the rotating table, a motor 2 is fixedly connected to the outer end of the mounting plate, a bidirectional screw 1 is rotatably connected to the inside of the mounting plate, two clamps are threadedly connected to the bidirectional screw 1, the inner end of the clamp is fixedly connected to a limiting block, limiting grooves are provided at both ends of the connecting plate, the limiting blocks and the limiting grooves correspond to each other, a sliding rod is fixedly connected to the inside of the mounting plate, the clamp is slidably connected to the sliding rod, the other end above the base is fixedly connected to a bracket, and the top of the bracket is fixedly connected to a top frame.

[0018] Working principle: When in use, the staff rolls the wheel hub to the middle of the two clamping platforms, and makes one end of the wheel hub contact with the clamping platform 1 6, then the motor 606 starts to drive the gear 3 605 to rotate, and under the meshing action, the rack 604 can drive the connecting column 602 and the clamping platform 2 601 to move outward, so that the wheel hub can be positioned and clamped through the two clamping bars, and then the motor 3 303 starts to drive the bidirectional screw 2 306 to rotate, and under the action of the threaded connection, the two threaded blocks 304 can move relative to each other, and as the two threaded blocks 304 gradually move outward, the positioning plate 4 can gradually move downward under the transmission action of the connecting rod 305, so that the circular disk 5 can correspond to the hollow inner ring of the wheel hub;

[0019] Subsequently, the cylinder 405 is started to drive the circular plate 5 to move outward, so that the circular plate 5 can correspond to the rear end surface of the wheel hub, and then the internal motor 509 is started to drive the fixed plate 506 to complete the rotation, and through the arc groove 504 and the sliding column 508, the movable frame 505 can drive the arc clamping plate 501 at the outer end to gradually move outward, and through the three groups of arc clamping plates 501, they can contact the hollow inner ring of the wheel hub, thereby playing a clamping role. After the clamping is completed, the clamping table 2 601 is gradually released, and at this time, the motor 1 2 06 starts to drive the worm 205 to rotate, and under the meshing action, the worm wheel 204 can drive the rotating shaft 202 to rotate, so as to complete the rotation of the hub to the upper end of the rotating table 2 for processing. In order to facilitate the processing, the starting motor 402 can drive the gear 2 404 to rotate, and under the meshing action, it can drive the gear 1 403 and the cylinder 405 to rotate, so that the cylinder 405 rotates 90 degrees, ensuring that the hub at the extended end can correspond to the processing equipment and complete its processing operation.

[0020] (III) Beneficial effects

[0021] The present invention provides a hub processing turntable tooling for hub production, which has the following beneficial effects:

[0022] 1. The present invention can position and clamp the wheel hub by arranging a fixed clamping platform 1 and a movable clamping platform 2 on the base to ensure that the circular disk can correspond to the cavity of the wheel hub, and the height of the circular disk can be adjusted by the two-way screw rod 2, the threaded block and the connecting rod, and the position of the circular disk can be adjusted by the cylinder to ensure that the circular disk corresponds to the wheel hub, and the wheel hub is positioned and clamped by the internal arc clamping plate, and finally the wheel hub is automatically turned over by the worm and worm gear structure, without manual handling, saving time and labor, and greatly improving production efficiency;

[0023] 2. The present invention can clamp and position the turning mechanism after the wheel hub is turned over by arranging the bidirectional screw, the clamping plate, the limit block and the limit groove, so as to improve the processing stability of the entire turning assembly;

[0024] 3. The gear assembly is arranged at the outer end of the cylinder in the present invention to realize the angle adjustment function, ensure that the wheel hub can correspond to the processing equipment, and can complete the angle adjustment during processing, thereby improving the processing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view of the present invention;

[0026] Figure 2 is a side view of the present invention;

[0027] Figure 3 It is a schematic diagram of the flipping mechanism of the present invention;

[0028] Figure 4 is a schematic diagram of a splint assembly of the present invention;

[0029] Figure 5 It is a schematic diagram of a fixing column of the present invention;

[0030] Figure 6 It is a schematic diagram of the interior of a circular disk of the present invention.

[0031] Among them: 1. Base; 101. Bracket; 102. Top frame; 103. Column; 2. Rotating table; 201. U-shaped frame; 202. Rotating shaft; 203. Rotating part; 204. Worm gear; 205. Worm; 206. Motor 1; 207. Motor 2; 208. Bidirectional screw 1; 209. Mounting plate; 2010. Limit block; 2011. Clamp; 2012. Slide rod; 3. Connecting plate; 301. Telescopic rod; 302. Limiting groove; 303. Motor 3; 304. Threaded block; 305. Connecting rod; 306. Bidirectional screw 2; 4. Positioning Plate; 401, rotating frame; 402, motor four; 403, gear one; 404, gear two; 405, cylinder; 5, round plate; 501, arc-shaped clamping plate; 502, slide groove one; 503, slider one; 504, arc-shaped groove; 505, movable frame; 506, fixed plate; 507, fixed frame; 508, sliding column; 509, motor five; 6, clamping table one; 601, clamping table two; 602, connecting column; 603, fixed column; 604, rack; 605, gear three; 606, motor six; 607, slide groove two; 608, slider two. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example:

[0034] like Figure 1-6As shown, the embodiment of the present invention provides a hub processing turntable tooling for hub production, including a base 1, four ends of the upper part of the base 1 are fixedly connected with columns 103, the top of the column 103 is fixedly connected with a rotating table 2, the base 1 is fixedly connected with a clamping table 1 6 near the front end of the column 103, the upper right side of the base 1 is fixedly connected with a fixed column 603, the interior of the fixed column 603 is movably connected with a connecting column 602, the other end of the connecting column 602 is fixedly connected with a clamping table 2 601, the inner ends of the clamping table 1 6 and the clamping table 2 601 are both arc-shaped designs, and the arc-shaped design can correspond to the periphery of the hub to ensure the clamping effect of the hub, so as to facilitate the subsequent correspondence between the circular disk and the hub;

[0035] The outer end of the connecting column 602 is fixedly connected with a rack 604, the outer end of the fixed column 603 is fixedly connected with a motor 606, the output end of the motor 606 is fixedly connected with a gear 3 605, part of the gear 3 605 is arranged inside the fixed column 603 and meshes with the rack 604, the other end of the outer side of the connecting column 602 is provided with a slide groove 2 607, the inner end of the fixed column 603 is fixedly connected with a slider 2 608, the slider 2 608 is slidably connected inside the slide groove 2 607, starting the motor 606 can drive the gear 3 605 to rotate, and under the meshing action, the rack 604 can drive the connecting column 602 to gradually move outward, and in the process of moving outward, it can drive the clamping platform 2 601 to position and clamp the wheel hub;

[0036] The rotating table 2 is internally rotatably connected to a rotating shaft 202, a rotating member 203 is fixedly connected to the rotating shaft 202, the outer end of the rotating member 203 is fixedly connected to a connecting plate 3, the upper end of the connecting plate 3 is fixedly connected to a mounting frame, the outer end of the mounting frame is fixedly connected to a motor 303, the inner part of the mounting frame is rotatably connected to a bidirectional screw 2 306, the output end of the motor 303 is fixedly connected to the bidirectional screw 2 306, the bidirectional screw 2 306 is threadedly connected to two threaded blocks 304, the upper end of the threaded block 304 is rotatably connected to a connecting rod 305, and the other end of the connecting rod 305 is rotatably connected to a positioning Plate 4, the four ends above the connecting plate 3 are fixedly connected with telescopic rods 301, and the extended ends of the telescopic rods 301 are fixedly connected to the bottom of the positioning plate 4. The starting motor 303 can drive the two-way screw 306 to rotate, and the two threaded blocks 304 can move relative to each other under the action of the threaded connection. As the two threaded blocks 304 gradually move outward, the positioning plate 4 can gradually move downward under the transmission action of the connecting rod 305, so that the circular disk 5 can correspond to the hollow inner ring of the wheel hub, and the telescopic rods 301 at the four ends can ensure the stability of the lifting and adjusting assembly during adjustment;

[0037] A rotating frame 401 is fixedly connected to the top of the positioning plate 4, and a cylinder 405 is rotatably connected to the inside of the rotating frame 401. The rotating end of the cylinder 405 penetrates the rotating frame 401 and is fixedly connected to a gear 2 404 outwardly. A motor 402 is fixedly connected to the positioning plate 4, and a gear 1 403 is fixedly connected to the output end of the motor 402. The gear 1 403 and the gear 2 404 are meshed with each other. The cylinder 405 can drive the circular disk 5 to move, so that the circular disk 5 can correspond to the rear end of the wheel hub, and the circular disk 5 is a detachable structure, which is installed on the extended end of the cylinder 405 by means of threads. When processing wheels of different diameters, the staff can replace the circular disk 5 according to different processing conditions, thereby improving the use effect of the entire positioning assembly;

[0038] The extended end of the cylinder 405 is provided with a circular plate 5, the inner top of the circular plate 5 is fixedly connected with a motor 509, the output end of the motor 509 is fixedly connected with a fixed plate 506, and the inner bottom of the circular plate 5 is fixedly connected with three sets of fixed frames 507. The internal motor 509 is started to drive the fixed plate 506 to complete the rotation, and the movable frame 505 can drive the outer end of the arc clamping plate 501 to gradually move outward through the arc groove 504 and the sliding column 508, and the three sets of arc clamping plates 501 can contact with the hollow inner ring of the wheel hub, so as to achieve the clamping effect;

[0039] The interior of the fixed frame 507 is slidably connected with the movable frame 505, and the upper end of the movable frame 505 close to the fixed plate 506 is fixedly connected with a sliding column 508. The fixed plate 506 is provided with an arc groove 504, and the sliding column 508 is slidably connected inside the arc groove 504. By setting the movable frame 505, the stable sliding of the arc clamping plate 501 can be achieved, and the fixed plate 506 will drive the arc groove 504 to rotate together during the rotation process. Due to the particularity of the arc groove 504, the sliding column 508 can make the movable frame 505 slide inside the fixed frame 507 during the internal sliding process, so as to complete the opening and closing of the arc clamping plate 501, thereby achieving a quick clamping effect;

[0040] The movable frame 505 is fixedly connected with a slider 503 at one end away from the fixed plate 506. A slide groove 502 is provided at the outer end of the circular plate 5. The slider 503 passes through the slide groove 502 and is fixedly connected with an arc-shaped clamping plate 501 outward. The slider 503 and the slide groove 502 can improve the stability of the arc-shaped clamping plate 501 when moving.

[0041] The outer end of the rotating table 2 is fixedly connected with a U-shaped frame 201, and the top of the U-shaped frame 201 is fixedly connected with a motor 1 206. The output end of the motor 1 206 passes through the U-shaped frame 201 and is provided with a worm 205 inwardly. The outer end of the rotating shaft 202 is fixedly connected with a worm wheel 204, and the worm 205 and the worm wheel 204 are meshed with each other. After the clamping is completed, the clamping table 2 601 is gradually loosened, and at this time, the motor 1 206 starts to drive the worm 205 to rotate, and the worm wheel 204 can drive the rotating shaft 202 to rotate under the meshing action, so as to complete the rotation of the hub to the upper end of the rotating table 2 for processing. In addition, for the convenience of processing, starting the motor 402 can drive the gear 2 404 to rotate, and can drive the gear 1 403 and the cylinder 405 to rotate under the meshing action, so that the cylinder 405 rotates 90 degrees, ensuring that the hub at the extended end can correspond to the processing equipment and complete its processing operation.

[0042] A mounting plate 209 is fixedly connected to one end of the rotating table 2, and a motor 207 is fixedly connected to the outer end of the mounting plate 209. A bidirectional screw 208 is rotatably connected to the inside of the mounting plate 209, and two clamps 2011 are threadedly connected to the bidirectional screw 208. The inner end of the clamp 2011 is fixedly connected to a limit block 2010. Limit grooves 302 are provided at both ends of the connecting plate 3. The limit blocks 2010 correspond to the limit grooves 302. A sliding rod 2012 is fixedly connected to the inside of the mounting plate 209, and the clamp 2011 is slidably connected to the sliding rod 201 2, the other end above the base 1 is fixedly connected with a bracket 101, and the top of the bracket 101 is fixedly connected with a top frame 102. After the wheel hub rotates to the top of the rotating table 2, the motor 207 is started to drive the internal bidirectional screw 1 208 to rotate, and the two clamping plates 2011 can be driven to achieve relative movement under the action of the threaded connection. During the inward movement of the clamping plate 2011, the limit block 2010 can enter the limit groove 302 at both ends of the connecting plate 3, completing the positioning of the flip assembly to ensure the stability of the wheel hub during processing.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wheel hub processing turntable tool for wheel hub production, comprising a base (1), characterized in that: The four upper ends of the base (1) are fixedly connected to columns (103), the top of the column (103) is fixedly connected to a rotating platform (2), the base (1) is fixedly connected to a clamping platform (6) near the front end of the column (103), the upper right side of the base (1) is fixedly connected to a fixed column (603), the interior of the fixed column (603) is movably connected to a connecting column (602), the other end of the connecting column (602) is fixedly connected to a clamping platform (601), and the inner ends of the clamping platform (6) and the clamping platform (601) are both arc-shaped; The outer end of the connecting column (602) is fixedly connected to a rack (604), the outer end of the fixed column (603) is fixedly connected to a motor six (606), the output end of the motor six (606) is fixedly connected to a gear three (605), a portion of the gear three (605) is arranged inside the fixed column (603) and meshes with the rack (604), the other end of the outer side of the connecting column (602) is provided with a slide groove two (607), the inner end of the fixed column (603) is fixedly connected to a slider two (608), and the slider two (608) is slidably connected inside the slide groove two (607); The rotating table (2) is rotatably connected to a rotating shaft (202) inside, a rotating member (203) is fixedly connected to the rotating shaft (202), an outer end of the rotating member (203) is fixedly connected to a connecting plate (3), an upper end of the connecting plate (3) is fixedly connected to a mounting frame, an outer end of the mounting frame is fixedly connected to a motor (303), a bidirectional screw rod (306) is rotatably connected inside the mounting frame, an output end of the motor (303) is fixedly connected to the bidirectional screw rod (306), two threaded blocks (304) are threadedly connected to the bidirectional screw rod (306), an upper end of the threaded block (304) is rotatably connected to a connecting rod (305), the other end of the connecting rod (305) is rotatably connected to a positioning plate (4), four upper ends of the connecting plate (3) are fixedly connected to telescopic rods (301), and an extended end of the telescopic rod (301) is fixedly connected to the bottom of the positioning plate (4).

2. The wheel hub processing turntable tooling for wheel hub production according to claim 1, characterized in that: A rotating frame (401) is fixedly connected above the positioning plate (4), a cylinder (405) is rotatably connected inside the rotating frame (401), and a rotating end of the cylinder (405) passes through the rotating frame (401) and is fixedly connected to a second gear (404) outwardly.

3. The wheel hub processing turntable tooling for wheel hub production according to claim 2, characterized in that: The positioning plate (4) is fixedly connected to a motor four (402), the output end of the motor four (402) is fixedly connected to a gear one (403), and the gear one (403) and the gear two (404) are meshed with each other.

4. The wheel hub processing turntable tooling for wheel hub production according to claim 2, characterized in that: The extended end of the cylinder (405) is provided with a circular disk (5), the inner top of the circular disk (5) is fixedly connected to a motor five (509), the output end of the motor five (509) is fixedly connected to a fixed disk (506), and the inner bottom of the circular disk (5) is fixedly connected to three sets of fixed frames (507).

5. The wheel hub processing turntable tooling for wheel hub production according to claim 4, characterized in that: The fixed frame (507) is slidably connected to a movable frame (505) inside, and a sliding column (508) is fixedly connected to an upper end of the movable frame (505) close to the fixed plate (506). An arc groove (504) is provided on the fixed plate (506), and the sliding column (508) is slidably connected to the inside of the arc groove (504).

6. The wheel hub processing turntable tooling for wheel hub production according to claim 5, characterized in that: One end of the movable frame (505) away from the fixed disk (506) is fixedly connected to a slider 1 (503), the outer end of the circular disk (5) is provided with a slide groove 1 (502), and the slider 1 (503) passes through the slide groove 1 (502) and is fixedly connected to an arc-shaped clamping plate (501) outwardly.

7. The wheel hub processing turntable tooling for wheel hub production according to claim 1, characterized in that: A U-shaped frame (201) is fixedly connected to one end of the outer side of the rotating platform (2), a motor 1 (206) is fixedly connected to the top of the U-shaped frame (201), a worm (205) is provided inwardly at the output end of the motor 1 (206) passing through the U-shaped frame (201), and a worm (204) is fixedly connected to the outer end of the rotating shaft (202), and the worm (205) and the worm wheel (204) are meshed with each other.

8. The wheel hub processing turntable tooling for wheel hub production according to claim 1, characterized in that: A mounting plate (209) is fixedly connected to one end of the rotating platform (2) at the top, a motor (207) is fixedly connected to the outer end of the mounting plate (209), a bidirectional screw (208) is rotatably connected to the inside of the mounting plate (209), two clamping plates (2011) are threadedly connected to the bidirectional screw (208), the inner ends of the clamping plates (211) are fixedly connected to limit blocks (210), limit slots (302) are provided at both ends of the connecting plate (3), the limit blocks (210) and the limit slots (302) correspond to each other, a sliding rod (212) is fixedly connected to the inside of the mounting plate (209), the clamping plate (211) is slidably connected to the sliding rod (212), the other end of the top of the base (1) is fixedly connected to a bracket (101), and the top of the bracket (101) is fixedly connected to a top frame (102).

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