Manual driving device for belt-driven compact rack

Abstract

The present invention discloses a manual drive device for a belt-driven compact shelving system. A pulley brake mechanism is provided above a transition pulley. The pulley brake mechanism includes a bracket and a sliding unit. The bracket is fixedly connected to an integrated board. The sliding unit is slidably connected to the bracket. The sliding unit spans both ends of the transition pulley. One end of the sliding unit is fixedly connected to an electric push rod, which is slidably connected to the bracket. The driving end of the electric push rod is fixedly connected to a first friction plate, and the other end of the sliding unit is fixedly connected to a second friction plate. The present invention has an ingenious structure. The first and second friction plates are clamped or released by the telescopic action of the electric push rod, thereby effectively achieving the braking or release function of the transition pulley. The braking force of the brake mechanism does not act radially on the wheel groove of the transition pulley, but rather on the end faces on both sides of the transition pulley, thus preventing damage to the pulley groove and the pulley shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of compact shelving, and in particular to a manual driving device for a belt-driven compact shelving. Background Art

[0002] A compact shelving cabinet is usually composed of a number of compact shelving units, which are installed on ground guide rails and are equipped with a manual drive device, which moves the compact shelving units back and forth along the guide rails. Existing manual drive devices for compact shelving units are mostly chain transmission structures or transmission gear meshing structures. The chain transmission structure has the advantage of high load-bearing capacity, but also has the following defects: poor transmission smoothness, and is prone to generating additional dynamic loads, vibration, impact, and noise during operation; high manufacturing and operating costs, and the chain needs to be lubricated regularly, otherwise the chain is susceptible to wear and corrosion; the chain needs to be regularly inspected and the chain tightness adjusted, otherwise it is easy to fall off or form idling (commonly known as chain falling) after a certain period of use; the gear meshing transmission structure has the advantage of high transmission accuracy, but also has the following defects: the precision requirements for gear manufacturing and installation are high, resulting in higher costs, and the manufacturing process is complex, maintenance and repair are inconvenient, and the adaptability to the operating environment is poor; the operating noise is loud, the speed change adaptability is poor, and the overall manual drive device is heavy and bulky. The belt drive has the characteristics of smooth transmission operation, low noise, no need for lubrication, and easy maintenance. Therefore, using belt drive to replace the chain drive in the manual drive device of the compact shelving is one of the development directions of the compact shelving drive. At present, the compact shelving belt drive structure has appeared on the market. However, the locking brake device on the existing integrated frame is to achieve the purpose of braking the integrated frame by clamping a locking rod with a conical head in the sprocket groove of the transition sprocket. If the existing locking brake device is used to lock the transition pulley, since the pulley usually has no tooth structure, even if it has a very shallow tooth groove, the locking rod will not be able to clamp the pulley and cannot effectively brake the pulley. If you want to rely on the tail of the locking rod to radially tighten the wheel groove of the transition pulley to achieve the purpose of braking, firstly, the tightening force needs to be large enough. It is not realistic to achieve this force by simply turning the brake rod and cam by hand. Secondly, excessive tightening force will cause damage to the pulley groove and exert a large pressure on the pulley shaft for a long time, causing the pulley shaft to deform and affect normal use. Therefore, this locking brake device is not suitable for the belt drive structure, so the structure of the compact shelving locking brake device needs to be optimized. Summary of the Invention

[0003] The purpose of the present invention is to provide a manual driving device for a belt-driven compact rack, optimize the structure of a locking brake device of the integrated rack, and effectively brake the transition pulley.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The transmission belt is connected with the transmission belt by the first synchronous belt and the second synchronous belt.

[0006] Furthermore, the bracket includes a horizontal plate and a connecting plate, the connecting plate is fixedly connected to the integrated plate by bolts, the horizontal plate and the connecting plate are vertically fixedly connected, a rib plate is fixedly arranged between the horizontal plate and the connecting plate, two parallel vertical plates are fixedly connected below the end of the horizontal plate, the end of the vertical plate is fixedly connected to the support plate, a sliding hole is opened in the middle of the vertical plate, and a sliding groove is opened at the bottom of the vertical plate.

[0007] Furthermore, the sliding unit includes a sliding rod, the diameter of the sliding rod matches the aperture of the sliding hole, one end of the sliding rod is detachably fixedly connected to the first push plate, and the other end is fixedly connected to the second push plate, the bottom of the first push plate is fixedly connected to the first mounting seat, the bottom of the second push plate is fixedly connected to the second friction plate mounting plate through a connecting block, the second friction plate is fixedly connected to the second friction plate mounting plate, and the sliding rod is sleeved in the sliding hole and slidably connected to the bracket.

[0008] Furthermore, the electric push rod body is matched with the sleeve in the slide groove and is slidably connected to the bracket, the fixed end of the electric push rod is sleeved in the first mounting seat and fixedly connected to the first mounting seat by bolts, the driving end of the electric push rod is sleeved with the second mounting seat and fixedly connected to the second mounting seat by bolts, the second mounting seat is fixedly connected to the first friction plate mounting plate, and the first friction plate is fixedly connected to the first friction plate mounting plate.

[0009] Furthermore, the elastic unit includes a spring seat, a compression spring, a fixed plate and a short shaft. The fixed plate is fixedly arranged in the middle of the sliding rod, the short shaft is fixedly connected to the fixed plate and is located at the lower part of the sliding rod, the spring seat is fixedly arranged in the middle of the vertical plate adjacent to the fixed plate and the opening faces the short shaft, the spring seat and the short shaft are coaxial, the compression spring is located in the spring seat and is sleeved on the short shaft, and the two ends of the compression spring are respectively close to the vertical plate and the fixed plate.

[0010] Furthermore, a limit rod is fixedly provided in the middle of the outermost vertical plate on the bracket, and the limit rod faces outward. When the first friction plate and the second friction plate clamp the transition pulley, the distance between the limit rod and the first push plate is controlled at 2-4 mm.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The present invention has an ingenious structure and is provided with a pulley brake mechanism. The pulley brake mechanism includes a bracket and a sliding unit. The bracket is fixedly connected to the integrated board, and the sliding unit is slidably connected to the bracket. One end of the sliding unit is fixedly connected to a first friction plate via an electric push rod, and the other end is fixedly connected to a second friction plate. The sliding unit spans over the transition pulley and positions the first and second friction plates at both ends of the transition pulley. The first and second friction plates are clamped or released by the telescopic action of the electric push rod, thereby effectively achieving the braking or releasing function of the transition pulley. The braking force of the brake mechanism does not act radially on the wheel groove of the transition pulley, but acts on the end faces on both sides of the transition pulley, thereby not causing damage to the pulley groove and the pulley shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the main view of the present invention;

[0014] Figure 2 for Figure 1 Middle AA section view;

[0015] Figure 3 Schematic diagram of the pulley brake mechanism;

[0016] Figure 4 This is a comparison diagram of the transition pulley braking and release states;

[0017] Figure 5 is a schematic diagram of the bracket;

[0018] Figure 6 is a schematic diagram of a sliding unit;

[0019] Figure 7 This is a diagram of the tension pulley assembly;

[0020] Figure 8 This is a schematic diagram of the transition pulley assembly;

[0021] Figure 9 This is a schematic diagram of the output pulley assembly;

[0022] Figure 10 This is a diagram of the tension bearing assembly;

[0023] Figure 11 It is a schematic diagram of the existing transition sprocket brake mechanism;

[0024] In the figure: 1-integrated plate, 2-crank handle, 201-straight shaft, 3-driving pulley, 4-tensioning pulley, 401-first shaft, 402-first bearing, 403-first retaining ring, 5-pulley brake mechanism, 501-bracket, 502-cross plate, 503-connecting plate, 504-rib plate, 505-vertical plate, 506-support plate, 507-spring seat, 508-limiting rod, 509-slide hole, 510-slide groove, 511-sliding unit, 512-slide rod, 513-first push plate, 514-first mounting seat, 515-second push plate, 516-connecting block, 517-second friction plate mounting plate, 518-fixed plate, 519-short shaft, 520-compression spring, 521-electric push rod, 522-second mounting seat, 523-first Friction plate mounting plate, 524-first friction plate, 525-second friction plate, 6-transition pulley, 601-first large pulley, 602-first small pulley, 603-second shaft, 604-second bearing, 605-second retaining ring, 7-output pulley, 701-second large pulley, 702-second small pulley, 703-third shaft, 704-third bearing, 705-third retaining ring, 8-walking pulley, 9-dense rack walking device, 10-first synchronous belt, 11-tensioning bearing, 1101-fourth shaft, 1102-fourth retaining ring, 12-second synchronous belt, 13-third synchronous belt, 14-transition sprocket, 15-locking brake device, 1501-locking rod, 1502-return spring, 1503-cam, 1504-brake rod. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] See also Figures 1-10 , an embodiment provided by the present invention:

[0027] A manual drive device for a belt-driven compact rack comprises an integrated plate 1 and a rotatable driving pulley 3, a tensioning pulley 4, a transition pulley 6 and an output pulley 7 fixedly arranged on the integrated plate 1 from top to bottom. The driving pulley 3 is fixedly connected to a crank 2 via a straight shaft 201. The straight shaft 201 is rotatably connected to the integrated plate 1. The driving pulley 3 can be driven to rotate by turning the crank 2. A first shaft 401, a second shaft 603 and a third shaft 703 are arranged below the straight shaft 201. The ends are fixedly connected to the integrated board 1 by bolts, and the other end is suspended. There are two first shafts 401 and they are symmetrically arranged. The tension pulley 4 is rotatably connected to the first shaft 401 through the first bearing 402. The two ends of the tension pulley 4 are axially positioned by the first retaining ring 403. The tension pulley 4 is axially aligned with the driving pulley 3. The transition pulley 6 includes a first large pulley 601 and a first small pulley 602 that are coaxially fixed. The transition pulley 6 is rotatably connected to the second shaft 603 through the second bearing 604. The two ends of the transition pulley 6 are axially positioned by the second retaining ring 6 05 axial positioning, the first large pulley 601 is axially aligned with the tensioning pulley 4, the output pulley 7 includes a second large pulley 701 and a second small pulley 702 coaxially fixedly connected, the output pulley 7 is rotatably connected to the third shaft 703 through a third bearing 704, and both ends of the output pulley 7 are axially positioned by a third retaining ring 705, the second small pulley 702 is axially aligned with the first large pulley 601, the driving pulley 3 is connected to the first large pulley 601 of the transition pulley 6 through the first synchronous belt 10 across the tensioning pulley 4, and the first small pulley 702 of the transition pulley 6 is connected to the first large pulley 601 of the transition pulley 6. A small pulley 602 is connected to the second large pulley 701 of the output pulley 7 through the second synchronous belt 12. The second small pulley 702 of the output pulley 7 is connected to the walking pulley 8 on the compact shelving walking device 9 through the third synchronous belt 13. A fourth shaft 1101 is arranged between the straight shaft 201 and the first shaft 401. The fourth shaft 1101 is fixedly connected to the integrated board 1 by bolts. The fourth shaft 1101 is axially positioned and installed with a tensioning bearing 11 through a fourth retaining ring 1102. The tensioning bearing 11 presses the first synchronous belt 10.

[0028] A pulley brake mechanism 5 is provided above the transition pulley 6. The pulley brake mechanism 5 includes a bracket 501 and a sliding unit 511. The bracket 501 is fixedly connected to the integrated board 1. The sliding unit 511 is slidably connected to the bracket 501. The sliding unit 511 spans both ends of the transition pulley 6. One end of the sliding unit 511 is fixedly connected to an electric push rod 521. The electric push rod 521 is slidably connected to the bracket 501. The driving end of the electric push rod 521 is fixedly connected to a first friction plate 524. The other end of the sliding unit 511 is fixedly connected to a second friction plate 525. When the electric push rod 521 is extended, it pushes the first friction plate 524 and the second friction plate 525 to clamp the transition pulley 6. An elastic unit is provided between the bracket 501 and the sliding unit 511. The elastic unit bounces the first friction plate 524 and the second friction plate 525 to both sides when the electric push rod 521 contracts.

[0029] Among them, the bracket 501 includes a horizontal plate 502 and a connecting plate 503, the connecting plate 503 is fixedly connected to the integrated plate 1 by bolts, the horizontal plate 502 and the connecting plate 503 are vertically welded, a rib plate 504 is welded between the horizontal plate 502 and the connecting plate 503, two parallel vertical plates 505 are welded below the end of the horizontal plate 502, the end of the vertical plate 505 is fixedly connected to the support plate 506, which is used to support the electric push rod 521, a sliding hole 509 is opened in the middle of the vertical plate 505, and a sliding groove 510 is opened at the bottom of the vertical plate 505.

[0030] Among them, the sliding unit 511 includes a sliding rod 512, the diameter of the sliding rod 512 matches the aperture of the sliding hole 509, one end of the sliding rod 512 is detachably fixedly connected to the first push plate 513 by a nut, which is convenient for installation and disassembly, and the other end is welded with a second push plate 515, the bottom of the first push plate 513 is welded with a first mounting seat 514, and the bottom of the second push plate 515 is welded with a second friction plate mounting plate 517 through a connecting block 516, the second friction plate 525 and the second friction plate mounting plate 517 are fixedly connected by gluing or screws, the sliding rod 512 is sleeved in the sliding hole 509 and slidably connected to the bracket 501, so that the sliding unit 511 can slide left and right.

[0031] Among them, the main body of the electric push rod 521 is matched with the sleeve in the slide groove 510 and is slidably connected to the bracket 501, so that the electric push rod 521 can slide left and right, and the fixed end of the electric push rod 521 is sleeved in the first mounting seat 514 and fixedly connected to the first mounting seat 514 by bolts. The driving end of the electric push rod 521 is sleeved with the second mounting seat 522 and fixedly connected to the second mounting seat 522 by bolts. The second mounting seat 522 is fixedly connected to the first friction plate mounting plate 523, and the first friction plate 524 and the first friction plate mounting plate 523 are fixedly connected by gluing or screws.

[0032] Among them, the elastic unit includes a spring seat 507, a compression spring 520, a fixed plate 518 and a short shaft 519. The fixed plate 518 is welded to the middle part of the sliding rod 512. The short shaft 519 is threadedly fixed to the fixed plate 518 and is located at the lower part of the sliding rod 512. The spring seat 507 is welded to the middle part of the vertical plate 505 adjacent to the fixed plate 518 and the opening faces the short shaft 519. The spring seat 507 and the short shaft 519 are coaxial. The compression spring 520 is located in the spring seat 507 and is sleeved on the short shaft 519. The two ends of the compression spring 520 are respectively close to the vertical plate 505 and the fixed plate 518.

[0033] Among them, the middle part of the outermost vertical plate 505 on the bracket 501 is threadedly connected to the limit rod 508, and the limit rod 508 faces outward. By rotating the limit rod 508, the extension length of the limit rod 508 can be adjusted, thereby adjusting the limit position of the sliding unit 511. When the first friction plate 524 and the second friction plate 525 clamp the transition pulley 6, the distance between the limit rod 508 and the first push plate 513 is controlled at 3 mm.

[0034] The electric push rod 521 model is IP60, with a no-load speed of 4mm / s, a thrust of 150N, a stroke setting of 6mm, and is powered by 24V DC. The electric push rod 521 is provided with two control buttons for extension / retraction, which respectively control the extension and retraction actions of the electric push rod 521. The control switch is set on the integrated board 1 and is located above the pulley brake mechanism 5.

[0035] When the compact shelving is in a locked state, that is, when the pulley brake mechanism 5 is in a braking state, the first friction plate 524 and the second friction plate 525 clamp the transition pulley 6 under the action of the electric push rod 521, and the transition pulley 6 cannot rotate. When the compact shelving needs to move, the retraction button is pressed, and the push rod of the electric push rod 521 retracts, driving the first friction plate 524 to leave the transition pulley 6. At this time, the compression spring 520 pushes the fixed plate 518, the slide bar 512 and the second friction plate 525 to move to the left, so that the second friction plate 525 leaves the transition pulley 6. When the slide bar 512 moves to the left, it also drives the electric push rod 521 body to move to the left in the slide groove 510, so that the first friction plate 524 approaches the transition pulley 6. The push rod of the electric push rod 521 continues to retract and drives the slide bar 512 and the second friction plate 525 to continue to move to the left and leave the transition pulley. 6. When the first push plate 513 contacts the limit rod 508, the slide bar 512 and the second friction plate 525 no longer move to the left. Since the distance between the limit rod 508 and the first push plate 513 is 3 mm when the pulley brake mechanism 5 is in the braking state, the distance between the second friction plate 525 and the transition pulley 6 is also 3 mm at this time. The push rod of the electric push rod 521 continues to retract, driving the first friction plate 524 to leave the transition pulley 6. The stroke of the electric push rod 521 is 6 mm, so when the electric push rod 521 is fully retracted, the distance between the first friction plate 524 and the transition pulley 6 is also 3 mm. At this time, the braking state of the transition pulley 6 has been released. Then shake the handle 2 to drive the active pulley 3, the transition pulley 6, the output pulley 7 and the walking pulley 8 to rotate, thereby driving the compact shelving walking device 9 to make the compact shelving walk along the guide rail.

[0036] When the compact shelving no longer needs to be moved and needs to be locked, the push button is pressed. After the electric push rod 521 pushes the first friction plate 524 to press against the transition pulley 6, the electric push rod 521 overcomes the force of the compression spring 520 and pushes the first push plate 513, the slide bar 512, and the second friction plate 525 to move to the right until the second friction plate 525 presses against the transition pulley 6, thereby braking the transition pulley 6. The electric push rod 521 has an automatic locking function. Even if the power supply is out of power, the electric push rod 521 will maintain its original state and will not return to its original position due to power failure. The locking state of the transition pulley 6 is stable.

[0037] The locking brake device 15 on the existing chain-driven compact rack, such as Figure 11 As shown, when locking, the brake rod 1504 is rotated clockwise by hand, driving the cam 1503 to rotate clockwise, so that the cone head at the tail of the locking rod 1501 extends outward and is inserted into the sprocket groove of the transition sprocket 14, so that the transition sprocket 14 cannot rotate and achieves the purpose of locking the transition sprocket 14. When unlocking, the brake rod 1504 is rotated counterclockwise by hand, driving the cam 1503 to rotate counterclockwise. Under the action of the return spring 1502, the cone head at the tail of the locking rod 1501 retracts inward and leaves the sprocket groove of the transition sprocket 14, achieving the purpose of unlocking the transition sprocket 14.

[0038] Since the pulley usually has no tooth structure, or even if it has one, the tooth groove is very shallow. If the structure of the locking brake device 15 is used to brake the transition pulley 6, the locking rod 1501 has no groove to be stuck, and the transition pulley 6 cannot be effectively braked. If you want to rely on the tail of the locking rod 1501 to radially tighten the wheel groove of the transition pulley 6 to achieve the purpose of braking, firstly, this tightening force needs to be large enough. It is not realistic to achieve this force by simply turning the brake rod 1504 and the cam 1503 by hand. Secondly, excessive tightening force will cause damage to the pulley groove and also exert a large pressure on the pulley shaft for a long time, causing the pulley shaft to deform and affecting normal use.

[0039] The present invention has an ingenious structure and is provided with a pulley brake mechanism 5. The pulley brake mechanism 5 includes a bracket 501 and a sliding unit 511. The bracket 511 is fixedly connected to the integrated board 1. The sliding unit 511 is slidably connected to the bracket 501. One end of the sliding unit 511 is fixedly connected to a first friction plate 524 via an electric push rod 521, and the other end is fixedly connected to a second friction plate 525. The sliding unit 511 spans over the transition pulley 6, with the first friction plate 524 and the second friction plate 525 located at both ends of the transition pulley 6. The first friction plate 524 and the second friction plate 525 are clamped or released by the telescopic action of the electric push rod 521, thereby effectively achieving the braking or release function of the transition pulley 6. The braking force of the pulley brake mechanism 5 does not act radially on the wheel groove of the transition pulley 6, but acts on the end surfaces of the transition pulley 6 on both sides, which will not cause damage to the pulley groove or the pulley shaft.

[0040] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A belt-driven compact rack manual drive device, comprising an integrated plate (1) and a driving pulley (3), a tensioning pulley (4), a transition pulley (6) and an output pulley (7) fixedly arranged on the integrated plate (1) from top to bottom, wherein the driving pulley (3) is fixedly connected to a crank handle (2), the driving pulley (3) is connected to the transition pulley (6) through a first synchronous belt (10) across the tensioning pulley (4), and the transition pulley (6) is connected to the output pulley (7) through a second synchronous belt (12), characterized in that: A pulley brake mechanism (5) is provided above the transition pulley (6), and the pulley brake mechanism (5) comprises a bracket (501) and a sliding unit (511), wherein the bracket (501) is fixedly connected to the integrated board (1), and the sliding unit (511) is slidably connected to the bracket (501), and the sliding unit (511) spans across both ends of the transition pulley (6), and one end of the sliding unit (511) is fixedly connected to an electric push rod (521), and the electric push rod (521) is slidably connected to the bracket (501), and the driving end of the electric push rod (521) is fixedly connected to a first friction plate (524), and the sliding unit (511) is fixedly connected to the first friction plate (524). The other end of the element (511) is fixedly connected to a second friction plate (525); when the electric push rod (521) is extended, it pushes the first friction plate (524) and the second friction plate (525) to clamp the transition pulley (6); an elastic unit is provided between the bracket (501) and the sliding unit (511); when the electric push rod (521) is retracted, the elastic unit bounces the first friction plate (524) and the second friction plate (525) to both sides; a limiting rod (508) is provided between the bracket (501) and the sliding unit (511); the limiting rod (508) is used to control the sliding distance of the sliding unit (511); The bracket (501) includes a horizontal plate (502) and a connecting plate (503); two parallel vertical plates (505) are fixedly connected below the end of the horizontal plate (502); the ends of the vertical plates (505) are fixedly connected to a supporting plate (506); and a sliding hole (509) is opened in the middle of the vertical plates (505); The sliding unit (511) includes a sliding rod (512), the diameter of the sliding rod (512) matches the aperture of the sliding hole (509), one end of the sliding rod (512) is detachably fixedly connected to a first push plate (513), and the other end is fixedly connected to a second push plate (515), the bottom of the first push plate (513) is fixedly connected to a first mounting seat (514), the bottom of the second push plate (515) is fixedly connected to a second friction plate mounting plate (517) through a connecting block (516), the second friction plate (525) is fixedly connected to the second friction plate mounting plate (517), and the sliding rod (512) is sleeved in the sliding hole (509) and slidably connected to the bracket (501); The elastic unit includes a spring seat (507), a compression spring (520), a fixed plate (518) and a short shaft (519), wherein the fixed plate (518) is fixedly arranged in the middle of the slide bar (512), the short shaft (519) is fixedly connected to the fixed plate (518) and is located at the lower part of the slide bar (512), the spring seat (507) is fixedly arranged in the middle of the vertical plate (505) adjacent to the fixed plate (518) and the opening faces the short shaft (519), the spring seat (507) and the short shaft (519) are coaxial, the compression spring (520) is located in the spring seat (507) and is sleeved on the short shaft (519), and the two ends of the compression spring (520) are respectively close to the vertical plate (505) and the fixed plate (518); A limiting rod (508) is fixedly provided in the middle of the outermost vertical plate (505) on the bracket (501), and the limiting rod (508) faces outward. When the first friction plate (524) and the second friction plate (525) clamp the transition pulley (6), the distance between the limiting rod (508) and the first push plate (513) is controlled to be 2-4 mm.

2. The manual drive device for belt-driven compact shelving according to claim 1, characterized in that: The connecting plate (503) is fixedly connected to the integrated plate (1) via bolts, the transverse plate (502) is vertically fixedly connected to the connecting plate (503), a rib plate (504) is fixedly provided between the transverse plate (502) and the connecting plate (503), and a sliding groove (510) is provided at the bottom of the vertical plate (505).

3. The manual drive device for belt-driven compact shelving according to claim 1, characterized in that: The main body of the electric push rod (521) is matched and sleeved in the slide groove (510) and is slidably connected to the bracket (501). The fixed end of the electric push rod (521) is sleeved in the first mounting seat (514) and fixedly connected to the first mounting seat (514) by bolts. The driving end of the electric push rod (521) is sleeved with a second mounting seat (522) and fixedly connected to the second mounting seat (522) by bolts. The second mounting seat (522) is fixedly connected to the first friction plate mounting plate (523). The first friction plate (524) is fixedly connected to the first friction plate mounting plate (523).

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