Servo drive damper

Abstract

The application discloses a kind of servo driver damping devices, including vertical damping mechanism, it is characterized in that, vertical damping mechanism is fixedly installed with cover box, two lateral damping mechanisms are oppositely arranged in the cover box, and driving mechanism for driving lateral damping mechanism to abut servo driver is further provided, the driving mechanism includes the moving strip that is slidably arranged in the inner wall of cover box, the moving strip is hinged with strut, the end of strut away from moving strip is hinged with lateral damping mechanism, and the side surface of lateral damping mechanism is provided with ratchet mechanism for preventing lateral damping mechanism from moving away from servo driver direction.Moving towards servo driver direction by strut pushing lateral damping mechanism after placing the servo driver required to limit protection, finally abut servo driver, while damping protection is carried out to servo driver, so as to reach the effect that the width size of different servo driver can be realized damping protection.

Description

Technical Field

[0001] This invention relates to the field of servo drive technology, and more specifically to a servo drive vibration damping device. Background Technology

[0002] Existing servo drives are generally controllers used to control servo motors, functioning similarly to frequency converters for ordinary AC motors, and are part of a servo system. Because servo drives are an important component of modern motion control, they are widely used in automated equipment such as industrial robots and CNC machining centers. Servo drives are also used in various intelligent vehicles.

[0003] Servo drives contain a large number of electronic components. When servo drives are used in automobiles or during transportation, they are easily subjected to bumps and external forces, which can cause vibrations. Excessive vibrations may affect or damage the electronic components inside the servo drive.

[0004] To address the aforementioned technical problems, Chinese patent (patent number CN211702668U) discloses a servo driver, which includes a housing and a servo unit housed within the housing. A buffer assembly is located at the bottom of the housing, and the top of the buffer assembly is connected to the bottom of the servo unit. This invention, through the design of the buffer assembly, can reduce vibration and improve the stability of the servo unit. However, the aforementioned patent struggles to provide vibration damping protection for servo drivers of different sizes. Summary of the Invention

[0005] In order to solve at least one of the technical problems mentioned in the background art, the present invention aims to provide a servo drive vibration damping device that can achieve vibration damping protection for any servo drive.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a servo drive vibration damping device, comprising a housing and an abutment plate disposed within the housing. A fourth spring is fixedly installed on the side of the abutment plate away from the servo drive, and a support plate is fixedly installed on the side of the fourth spring away from the abutment plate. A ratchet mechanism for preventing the support plate from moving away from the servo drive is installed on the side of the support plate. An insertion hole is provided on the support plate. A push rod coaxial with the insertion hole is fixedly connected to the abutment plate. A slider is slidably installed on the side of the support plate away from the abutment plate. A blind hole is provided on the slider. An insertion rod is slidably installed in the blind hole. A first spring is fixedly installed between one end of the insertion rod and the bottom wall of the blind hole. A support rod is hinged to the slider. A movable strip is hinged to the end of the support rod away from the slider. The moving direction of the movable strip is not parallel to the moving direction of the support plate. In the initial state, the insertion rod is inserted into the insertion hole. When the push rod pushes the insertion rod out of the insertion hole, the slider is in a sliding state relative to the support plate.

[0007] Furthermore, the support plate has a through hole, and a telescopic rod passing through the through hole is fixedly installed on the side of the abutment plate near the support plate. The end of the telescopic rod away from the abutment plate is fixedly connected to the inner wall of the cover box.

[0008] Furthermore, the ratchet mechanism includes a locking block disposed on the side of the support plate and a toothed plate for preventing the locking block from moving away from the servo driver.

[0009] Furthermore, the toothed plate is provided with teeth evenly distributed along the moving direction of the support plate. The side of the teeth near the servo driver is perpendicular to the contact surface of the toothed plate, and the side of the teeth away from the servo driver is inclined to the contact surface of the toothed plate. The locking block is parallel to the two contact surfaces of the teeth. The support plate is provided with a slot for the locking block to slide. A second spring is installed between the locking block and the inner wall of the slot.

[0010] Furthermore, the toothed plate is slidably disposed on the inner wall of the cover box, and a third spring is fixedly installed between the toothed plate and the inner wall of the cover box. When the transverse damping mechanism is limited, the toothed plate and the locking block are at the same height. When the transverse damping mechanism is released, the toothed plate and the locking block are misaligned.

[0011] Furthermore, the abutment plate includes a contact plate for contacting the servo driver and a mounting plate fixedly connected to the fourth spring. The mounting plate has a square groove on the side near the contact plate. A guide rod is fixedly connected to the square groove. The axis of the guide rod extends in a direction that is not parallel to the moving direction of the bearing plate. A square block adapted to the square groove is slidably connected to the middle of the guide rod. A sixth spring is fixedly connected to both sides of the square block and around the surface of the guide rod. The end of the sixth spring away from the guide rod is fixedly connected to the inner wall of the square groove. The square block is fixedly connected to the contact plate.

[0012] Furthermore, a vertical shock absorption mechanism is fixedly installed at the bottom of the cover box. The vertical shock absorption mechanism includes a base and a fifth spring fixedly installed on the base. The base has an opening slot adapted to the cover box, and the fifth spring is located in the opening slot and fixedly connected to the bottom of the cover box.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the moving strip moves, and the support plate moves towards the servo driver through the support rod and the slider. When the abutment plate abuts against the side wall of the servo driver, the fourth spring will be compressed, and the push rod will gradually insert into the socket and approach the plug rod. When the fourth spring is compressed to the required compression amount, the push rod pushes the plug rod out of the socket. At this time, the slider can slide relative to the support plate, and the ratchet mechanism will restrict the reverse movement of the support plate, thereby maintaining the limiting work of the abutment plate on the servo driver, thereby achieving the effect of shock absorption protection for any servo driver. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram showing the structural breakdown of the present invention;

[0016] Figure 3 For the present invention in Figure 2 Enlarged schematic diagram of a portion of the structure at point A;

[0017] Figure 4 This is a top sectional view of the overall structure of the present invention;

[0018] Figure 5 For the present invention in Figure 4 A magnified schematic diagram of the first change in the structure at point B in the middle section;

[0019] Figure 6 For the present invention in Figure 4 A magnified schematic diagram of the second change in the structure at point B in the middle section;

[0020] Figure 7 For the present invention in Figure 4 Enlarged schematic diagram of the structure at point C;

[0021] Figure 8 This is a schematic diagram of the abutment plate structure of the present invention.

[0022] In the diagram: 1. Vertical damping mechanism; 11. Base; 12. Fifth spring; 13. Opening slot; 2. Cover box; 3. Lateral damping mechanism; 31. Bearing plate; 32. Fourth spring; 33. Abutment plate; 331. Contact plate; 332. Mounting plate; 333. Square slot; 334. Guide rod; 335. Square block; 336. Sixth spring; 34. Through hole; 35. Telescopic rod; 36. Adjustment unit; 37. 1. Slider; 362. Blind hole; 363. Insert rod; 364. First spring; 365. Insertion hole; 366. Push rod; 4. Drive mechanism; 41. Moving strip; 42. Support rod; 43. Ratchet mechanism; 431. Locking block; 432. Tooth plate; 433. Tooth; 434. Vertical surface; 435. Inclined surface; 436. Groove; 437. Second spring; 438. Third spring; 5. Servo driver. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Existing servo drives are generally controllers used to control servo motors, functioning similarly to frequency converters for ordinary AC motors, and are part of a servo system. Because servo drives are an important component of modern motion control, they are widely used in automated equipment such as industrial robots and CNC machining centers. Servo drives are also used in various intelligent vehicles.

[0025] Servo drives contain a large number of electronic components. When servo drives are used in automobiles or during transportation, they are easily subjected to bumps and external forces, which can cause vibrations. Excessive vibrations may affect or damage the electronic components inside the servo drive.

[0026] Please see Figure 1 , Figure 2 and Figure 3 This embodiment provides a servo driver vibration damping device, including a vertical vibration damping mechanism 1, a cover box 2 fixedly installed on the vertical vibration damping mechanism 1, two horizontal vibration damping mechanisms 3 arranged opposite to each other inside the cover box 2, and a drive mechanism 4 for driving the horizontal vibration damping mechanisms 3 to abut against the servo driver 5.

[0027] The drive mechanism 4 includes a movable strip 41 that is slidably disposed on the inner wall of the housing 2. A support rod 42 is hinged to the movable strip 41. The end of the support rod 42 away from the movable strip 41 is hinged to the transverse damping mechanism 3. A locking block 431 is slidably mounted on the side of the transverse damping mechanism 3 near the inner wall of the housing 2. A toothed plate 432 is installed on the inner wall of the housing 2 to prevent the locking block 431 from moving away from the servo driver 5. In the initial state, the length of the support rod 42 is greater than the distance between the movable strip 41 and the transverse damping mechanism 3.

[0028] When it is necessary to limit and fix the servo drive 5, first place the servo drive 5 between the two transverse damping mechanisms 3, and then push the moving plate 41. Because the length of the support rod 42 in the initial state is greater than the distance between the moving plate 41 and the transverse damping mechanism 3, the axis of the support rod 42 is tilted relative to the moving plate 41. As the moving plate 41 moves, it will push the transverse damping mechanism 3 towards the servo drive 5 through the support rod 42, and finally abut against the servo drive 5, thereby limiting the servo drive 5. At the same time, during the movement of the transverse damping mechanism 3, the locking block 431 moves with the transverse damping mechanism 3, and the toothed plate 432 prevents the locking block 431 from moving away from the servo drive 5, thereby preventing the limiting and locking of the transverse damping mechanism 3 on the servo drive 5 from loosening and affecting the damping effect of the transverse damping mechanism 3.

[0029] As can be seen from the above, in the initial state, the distance between the two transverse damping mechanisms 3 is the largest. After the servo driver 5 that needs to be limited is placed, the transverse damping mechanism 3 is moved by the drive mechanism 4. After the transverse damping mechanism 3 contacts the servo driver 5, it provides limit protection for the servo driver 5, thereby achieving the effect of limit protection for different width dimensions of the servo driver 5.

[0030] Please see Figure 1 and Figure 3 The transverse damping mechanism 3 includes a bearing plate 31 hinged to the support rod 42. A fourth spring 32 is fixedly installed on the side of the bearing plate 31 near the servo driver 5. An abutment plate 33 for abutting the servo driver 5 is fixedly installed on the side of the fourth spring 32 away from the bearing plate 31. A locking block 431 is slidably installed on the bearing plate 31.

[0031] The support plate 31 drives the abutment plate 33 to abut against the servo driver 5 through the fourth spring 32. When the servo driver 5 is moved by external force, the fourth spring 32 provides shock absorption protection for the servo driver 5.

[0032] Please see Figure 3 and Figure 4 To prevent the lateral damping mechanism 3 from shifting during movement, a through hole 34 is provided on the bearing plate 31. A telescopic rod 35 passing through the through hole 34 is fixedly installed on the side of the abutment plate 33 near the bearing plate 31. The end of the telescopic rod 35 away from the abutment plate 33 is fixedly connected to the inner wall of the cover box 2.

[0033] When the drive mechanism 4 pushes the support plate 31 to move, the support plate 31 moves along the telescopic rod 35 axially toward the servo driver 5, eventually causing the abutment plate 33 to abut against the surface of the servo driver 5.

[0034] When the drive mechanism 4 drives the transverse damping mechanism 3 to contact the servo driver 5, it needs to push the transverse damping mechanism 3 a further distance to compress the fourth spring 32 in the transverse damping mechanism 3, thereby providing clamping force while damping vibration. Because different servo drivers 5 have different widths, the distance that the drive mechanism 4 pushes the transverse damping mechanism 3 to contact the servo driver 5 also varies.

[0035] If the drive mechanism 4 pushes the transverse damping mechanism 3 to a small displacement, resulting in a small compression of the fourth spring 32, on the one hand, it is easy to cause a small clamping force on the servo driver 5, and the servo driver 5 is prone to disengagement when it vibrates and moves; on the other hand, when the servo driver 5 is subjected to force and vibration, the amplitude of the fourth spring 32 is too large, resulting in poor damping effect. If the drive mechanism 4 pushes the transverse damping mechanism 3 to a large displacement, resulting in a large compression of the fourth spring 32, when the servo driver 5 is subjected to force and vibration, the amplitude of the fourth spring 32 is small, and it is not able to fully unload the force on the servo driver 5, thus also resulting in poor damping effect.

[0036] Please see Figure 4 and Figure 5 To address the aforementioned technical issues, an adjustment unit 36 ​​is also installed on the side of the support plate 31 near the drive mechanism 4, and the end of the support rod 42 away from the moving strip 41 is hinged to the adjustment unit 36. This ensures that the initial compression of the fourth spring 32 remains consistent when providing vibration damping protection for different servo drives 5, just meeting the requirements and preventing the fourth spring 32 from being compressed too much or too little.

[0037] Please see Figure 4 , Figure 5 and Figure 6 The adjustment unit 36 ​​includes a slider 361 slidably mounted on the support plate 31. The slider 361 is hinged to the support rod 42. A blind hole 362 is provided on the side of the slider 361 near the support plate 31. An insertion rod 363 is slidably mounted in the blind hole 362. A first spring 364 is fixedly installed between one end of the insertion rod 363 and the bottom wall of the blind hole 362. An insertion hole 365 is provided on the support plate 31 for inserting the insertion rod 363. A push rod 366 is fixedly installed on the side of the abutment plate 33 near the support plate 31 for pushing the insertion rod 363 out of the insertion hole 365. In the initial state, one end of the insertion rod 363 is inserted into the insertion hole 365, and the push rod 366 is coaxial with the insertion rod 363.

[0038] In the initial state, one end of the plug 363 is inserted into the socket 365, and the slider 361 cannot slide relative to the support plate 31. As the moving strip 41 moves, the slider 361 is pushed towards the servo driver 5 by the support rod 42, which in turn drives the transverse damping mechanism 3 to move towards the servo driver 5, so that the abutment plate 33 in the transverse damping mechanism 3 abuts against the surface of the servo driver 5.

[0039] Then, as the moving plate 41 continues to move, the support plate 31 will continue to move towards the servo driver 5, while the abutment plate 33 remains stationary relative to the servo driver 5. At this time, the fourth spring 32 will be compressed, and the push rod 366 will gradually insert into the socket 365 and approach the insertion rod 363. When the fourth spring 32 is compressed to the required compression amount (that is, the test result that can maintain the clamping force of the abutment plate 33 on the servo driver 5, and also maintain good shock absorption elasticity when the servo driver 5 vibrates), the push rod 366 will push the insertion rod 363 out of the socket 365. At this time, the slider 361 can slide relative to the support plate 31. As the moving plate 41 continues to move, the support rod 42 will push the slider 361 to slide on the support plate 31, so that the support plate 31 stops moving.

[0040] Prior to this, when the carrier plate 31 moves relative to the housing 2, it drives the locking block 431 to move together in the direction of the servo driver 5, so that the locking block 431 passes through the toothed plate 432, and the toothed plate 432 will restrict the locking block 431 from moving in the opposite direction, maintaining the limiting ability of the lateral damping mechanism 3 on the servo driver 5.

[0041] When the transverse damping mechanism 3 releases the restriction on the servo driver 5, the push rod 366 disengages from the socket 365 and pulls the moving strip 41 in the opposite direction. The moving strip 41 will drive the slider 361 to reset through the support rod 42, so that one end of the plug rod 363 is inserted into the socket 365 again, making it impossible for the slider 361 to slide relative to the support plate 31.

[0042] Please see Figure 4 and Figure 7 The toothed plate 432 is provided with teeth 433 evenly distributed along the moving direction of the support plate 31. The side of the tooth 433 near the servo driver 5 is perpendicular to the contact surface of the toothed plate 432, and the side of the tooth 433 away from the servo driver 5 is inclined to the contact surface of the toothed plate 432, and the locking block 431 is parallel to the two contact surfaces of the tooth 433. The support plate 31 is provided with a slot 436 for the locking block 431 to slide. A second spring 437 is installed between the locking block 431 and the inner wall of the slot 436.

[0043] When the locking block 431 moves with the carrier plate 31 toward the servo driver 5, the locking block 431 moves relative to the tooth plate 432, so that the locking block 431 contacts the tooth 433. Since the side of the tooth 433 away from the servo driver 5 has an inclined surface 435 relative to the contact surface of the tooth plate 432, the locking block 431 compresses the second spring 437 and slides into the slot 436. After passing the first tooth 433, it extends out of the slot 436 again under the action of the second spring 437, waiting to contact the next tooth 433.

[0044] When the support plate 31 moves to the desired position, the slider 361 no longer provides thrust to the support plate 31. At this time, because the fourth spring 32 is in a compressed state and the abutment plate 33 is in abutting state with the servo driver 5, the support plate 31 tends to move away from the servo driver 5. However, because the side of the tooth 433 that is close to the servo driver 5 is perpendicular to the contact surface of the tooth plate 432, the tooth 433 restricts the movement of the locking block 431, thereby restricting the movement of the support plate 31. This avoids the lateral damping mechanism 3 from loosening its clamping of the servo driver 5, resulting in poor damping effect.

[0045] Please see Figure 2 To facilitate the replacement of the servo driver 5, the toothed plate 432 is slidably set relative to the housing 2 along its height direction. The moving direction of the toothed plate 432 is perpendicular to the moving direction of the locking block 431. In the initial state, the toothed plate 432 and the toothed block are at the same height. A third spring 438 for restoring the toothed plate 432 to its initial position is fixedly installed on one side of the toothed plate 432.

[0046] When it is necessary to release the limiting operation of the transverse damping mechanism 3 on the servo driver 5, press the toothed plate 432 to move the toothed plate 432, thereby disengaging the toothed plate 432 from the locking block 431. Then pull the moving strip 41 to move in the opposite direction. The moving strip 41 drives the transverse damping mechanism 3 to move away from the servo driver 5 through the support rod 42, thereby releasing the limiting operation on the servo driver 5, which facilitates the replacement of the servo driver 5 in a simple and quick manner.

[0047] Please see Figure 4 and Figure 8 To further improve the vibration damping effect on the servo driver 5, the servo driver 5 is protected against vibration in all directions. The abutment plate 33 includes a contact plate 331 for contacting the servo driver 5 and a fourth spring 32 fixedly connected to a mounting plate 332. A square groove 333 is opened on the side of the mounting plate 332 near the contact plate 331. A guide rod 334 is fixedly connected to the square groove 333. The axis of the guide rod 334 extends perpendicularly to the moving direction of the bearing plate 31 and perpendicular to the moving direction of the cover box 2. A square block 335 adapted to the square groove 333 is slidably connected to the middle of the guide rod 334. A sixth spring 336 is fixedly connected to both sides of the square block 335 and around the surface of the guide rod 334. The end of the sixth spring 336 away from the guide block is fixedly connected to the inner wall of the square groove 333. The square block 335 is fixedly connected to the contact plate 331.

[0048] If the fourth spring 32 protects the servo driver 5 from lateral vibration damage, then the sixth spring 336 protects the servo driver 5 from longitudinal vibration damage. When the servo driver 5 is subjected to longitudinal vibration force, that is, force along the axial direction of the guide rod 334, the servo driver 5 will drive the contact plate 331 to move. The contact plate 331 drives the direction block to squeeze the sixth spring 336, thereby buffering and damping the force on the servo driver 5, thereby reducing damage. Since there are two sixth springs 336, located on both sides of the square block 335, they protect against vibration damage in two directions. Combined with the vertical damping mechanism 1 and the fourth spring 32, the effect of all-round vibration protection for the servo driver 5 can be achieved.

[0049] To increase the friction between the contact plate 331 and the servo driver 5, a rubber friction layer is installed on the contact plate 331.

[0050] Please see Figure 1 and Figure 2 The vertical shock absorption mechanism 1 includes a base 11 and a fifth spring 12 fixedly installed on the base 11. The base 11 has an opening slot 13 adapted to the cover box 2. The fifth spring 12 is located in the opening slot 13 and is fixedly connected to the bottom of the cover box 2.

[0051] When the servo drive 5 is subjected to a vertical force, the second damping group will buffer and dampen the servo drive 5, and the housing 2 will also move along the height direction of the opening slot 13.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A servo driver damping device comprising a cover box (2) and an abutting plate (33) arranged in the cover box (2), characterized in that, The abutment plate (33) is fixedly installed with a fourth spring (32) away from the side of the servo driver, the fourth spring (32) is fixedly installed with a bearing plate (31) away from the side of the abutment plate (33), the bearing plate (31) is connected with the ratchet mechanism (43) between the inner wall of the cover box (2), the bearing plate (31) is provided with a insertion hole (365), the abutment plate (33) is fixedly connected with a push rod (366) coaxial with the insertion hole (365), the bearing plate (31) is slidably installed with a sliding block (361) away from the abutment plate (33), the sliding block (361) is provided with a blind hole (362), the blind hole (362) is slidably installed with a insertion rod (363), the first spring (364) is fixedly installed between the one end of the insertion rod (363) and the bottom wall of the blind hole (362), the sliding block (361) is hingedly connected with a support rod (42), the support rod (42) is hingedly connected with a moving strip plate (41) away from the sliding block (361), the moving direction of the moving strip plate (41) is not parallel to the moving direction of the bearing plate (31), in the initial state, the insertion rod (363) is inserted into the insertion hole (365), when the push rod (366) pushes the insertion rod (363) to separate from the insertion hole (365), the sliding block (361) is in a sliding state relative to the bearing plate (31); The ratchet mechanism (43) comprises a clamping block (431) arranged on the side of the bearing plate (31) and a toothed plate (432) for preventing the clamping block (431) from moving away from the servo driver (5); The toothed plate (432) is provided with teeth (433) uniformly distributed along the moving direction of the bearing plate (31), the side of the tooth (433) close to the servo driver (5) is a vertical surface (434) relative to the contact surface of the toothed plate (432), the side of the tooth (433) away from the servo driver (5) is an inclined surface (435) relative to the contact surface of the toothed plate (432), the two contact surfaces of the clamping block (431) and the tooth (433) are parallel, the bearing plate (31) is provided with a slot (436) for the sliding of the clamping block (431), the second spring (437) is installed between the clamping block (431) and the inner wall of the slot (436); The toothed plate (432) is slidably arranged on the inner wall of the cover box (2), the third spring (438) is fixedly installed between the toothed plate (432) and the inner wall of the cover box (2), when the lateral damping mechanism (3) is limited, the toothed plate (432) and the clamping block (431) are at the same height, when the lateral damping mechanism (3) is released, the toothed plate (432) and the clamping block (431) are distributed in a staggered manner.

2. The servo drive damping device of claim 1, wherein, The bearing plate (31) is provided with a through hole (34), the abutment plate (33) is fixedly installed with an expansion rod (35) passing through the through hole (34) close to the bearing plate (31), the expansion rod (35) is fixedly connected with the inner wall of the cover box (2) away from the abutment plate (33).

3. The servo drive damping device of claim 1, wherein, The abutting plate (33) comprises a contact plate (331) for contacting with the servo driver (5) and a fixedly arranged plate (332) with the fourth spring (32), a square slot (333) is arranged on one side of the plate (332) close to the contact plate (331), the square slot (333) is fixedly connected with a guide rod (334), the guide rod (334) is not parallel to the moving direction of the bearing plate (31) in the axial direction, a square block (335) is slidably connected in the middle of the guide rod (334) and is matched with the square slot (333), the sixth spring (336) is fixedly connected on both sides of the square block (335) and around the surface of the guide rod (334), one end of the sixth spring (336) away from the block is fixedly connected with the inner wall of the square slot (333), and the square block (335) is fixedly connected with the contact plate (331).

4. The servo drive damping device of claim 1, wherein, The bottom of the cover box (2) is also fixedly provided with a vertical damping mechanism (1), the vertical damping mechanism (1) comprises a machine base (11) and a fifth spring (12) fixedly arranged on the machine base (11), an opening slot (13) matched with the cover box (2) is arranged on the machine base (11), and the fifth spring (12) is located in the opening slot (13) and is fixedly connected with the bottom of the cover box (2).

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