CN115285675A - Anti-falling clamp suitable for battery detection equipment - Google Patents

Abstract

The invention relates to an anti-falling fixture suitable for battery testing equipment. An anti-falling fixture suitable for battery testing equipment according to the present invention includes: a bracket and a cell clamping assembly, the cell clamping assembly is fixed on the bracket; the cell clamping assembly includes a driving unit and a clamping claw unit, and the driving unit It includes a guide rail slide cylinder. The two air ports of the guide rail slide cylinder are respectively provided with a first speed control valve and a second speed control valve. The first speed control valve and the second speed control valve are pilot-operated check valves or three-position valves. The five-way belt is sealed with a solenoid valve; the gripper unit includes a first gripper and a second gripper, and the first gripper and the second gripper are respectively fixed and connected to the two sliding guide rails of the guide rail slide cylinder, and the guide rail slide cylinder It is used to drive the first gripper and the second gripper to move toward or away from each other. The anti-falling fixture applicable to the battery testing equipment according to the present invention has the advantages of preventing the battery core from falling when the gas is cut off or power off, protecting the product and ensuring the safety of production.

Description

An anti-drop fixture suitable for battery testing equipment

technical field

The invention relates to battery automatic testing equipment, in particular to an anti-drop clamp suitable for battery testing equipment.

Background technique

In the existing automatic battery testing equipment, the battery needs to be transported from the production line to the testing table. Under the rapid development of automation, the automatic battery testing equipment usually uses pneumatic control fixtures to complete the automatic handling of the battery.

However, when the existing pneumatic control fixtures are in the state of power failure, gas failure and abnormal vacuum, the battery cells will drop due to the lack of fixtures, and the battery cells will be easily damaged and scrapped and may cause fires, which may damage products and production. Security flaws.

Contents of the invention

Based on this, the purpose of the present invention is to provide an anti-drop fixture suitable for battery testing equipment, by setting a speed regulating valve that automatically closes the vent port when the gas is cut off or the power is cut off, it has the function of preventing the battery core from falling when the gas or power is cut off. The advantages of protecting products and ensuring production safety.

The present invention is realized by following scheme:

An anti-drop fixture suitable for battery testing equipment, including a bracket and a battery cell clamping assembly, the battery cell clamping assembly is fixed on the bracket; the battery cell clamping assembly includes a drive unit and a jaw unit, the The drive unit includes a guide rail slide cylinder, and the two air ports of the guide rail slide cylinder are respectively provided with a first speed regulating valve and a second speed regulating valve, wherein the first speed regulating valve and the second speed regulating valve The speed valve is a pilot-operated one-way valve or a three-position five-way solenoid valve with a middle seal;

The gripper unit includes a first gripper and a second gripper, the first gripper and the second gripper are respectively fixedly connected to two sliding guide rails on the same horizontal line as the cylinder of the rail slide table, the The guide rail slide cylinder is used to drive the first jaw and the second jaw to move toward or away from each other, wherein the first jaw and the second jaw are used to clamp the battery cell.

The anti-falling fixture suitable for battery testing equipment described in the present invention can maintain the air pressure in the cylinder when special conditions occur by setting a speed regulating valve that is automatically closed when the power is cut off or the gas is cut off, so as to prevent the battery cell from being damaged in a special situation. risk of falling.

Further, the first clamping jaw includes a first connecting arm and a first clamping arm, the second clamping jaw includes a second connecting arm and a second clamping arm, and the first connecting arm is connected to the first clamping arm respectively. A clamping arm is connected with a sliding guide rail of the guide rail slide cylinder, and the second connecting arm is respectively connected with the second clamp arm and the other slide guide rail of the guide rail slide cylinder. The clamping arm includes a first clamping face and the second clamping arm includes a second clamping face opposite the first clamping face.

Further, the first connecting arm is parallel to the moving direction of the sliding guide rail of the guide rail slide cylinder, and the first clamping arm is perpendicular to the first connecting arm;

The second connecting arm is perpendicular to the moving direction of the sliding guide rail of the guide rail slide cylinder, the second clamping arm is perpendicular to the second connecting arm, and the second clamping arm is connected to the first clamping arm. The connecting arms are parallel.

Further, anti-slip blocks are provided on the first clamping surface and the second clamping surface.

Further, the anti-slip block is a patterned polyurethane block.

Further, the clamping jaw unit also includes a through-radiation photoelectric, the transmitting end of the through-radiation photoelectric is arranged on the side of the first clamping arm, and the receiving end of the through-radiation photoelectric is arranged on the second On the side of the clamping arm, the optical path formed by the opposed photoelectric passes through the position where the electric core is clamped.

Further, the drive unit also includes a pressure reducing valve, a pressure gauge and a magnetic switch, the pressure gauge is fixed on the bracket, and the pressure reducing valve is connected with the pressure gauge and the cylinder of the guide rail slide; The magnetic switch is arranged in the top groove of the cylinder of the guide rail slide, and is used for detecting the position of the piston of the cylinder of the guide rail slide.

Further, the cell clamping assembly includes two groups.

Further, the bracket includes a fixed connecting flange, a first bracket, a second bracket, a first connecting plate, a second connecting plate, a first cylinder fixing plate and a second cylinder fixing plate, the two fixed connecting flanges The sides are respectively connected to the first bracket and the second bracket, the first bracket is connected to the first connection plate through the buffer assembly, and the second bracket is connected to the second connection plate through the buffer assembly; the first connection The plate is fixedly connected to the first cylinder fixing plate, the second connecting plate is fixedly connected to the second cylinder fixing plate, and the first cylinder fixing plate and the second cylinder fixing plate are respectively connected to the electric core Clamping component connections.

Further, the buffer assembly includes linear bearings, connecting rods and springs, one end of the plurality of connecting rods connects the first connecting plate and the second connecting plate, and the other end passes through the first bracket and the second connecting plate. Two brackets, and after passing through the linear bearings arranged on the first bracket and the second bracket, they are stuck on the top of the linear bearings, and the connecting rod can slide on the linear bearings; The spring is arranged on the connecting rod between the first bracket and the first connecting plate and the second bracket and the second connecting plate.

In the anti-fall fixture suitable for battery testing equipment described in the present invention, the guide rail slide table cylinder is used to drive the first jaw and the second jaw to move toward each other or opposite to each other, so as to realize the gripping of the first jaw and the second jaw The action of the battery cell; by setting the first speed regulating valve and the second speed regulating valve that automatically close the vents when the air is cut off or the power is cut off, the guide rail can be turned off when abnormal power or gas is cut off. The gas at both ends of the slide table cylinder is sealed in the guide rail slide table cylinder and cannot be discharged, so that the sliding guide rail of the guide rail slide table cylinder remains motionless, avoiding insufficient air pressure in the guide rail slide table cylinder due to gas failure, and causing the jaw unit to be cut off in the event of gas or power failure The battery can still be clamped to prevent the risk of the battery falling when the power or gas is cut off abnormally. Also by setting the pressure reducing valve, the battery can be manually removed in an emergency, and the pressure gauge and magnetic switch are set to monitor and give feedback to the cylinder of the slide table in real time; anti-slip blocks are set on the first jaw and the second jaw to increase The friction force reduces the risk of the battery cell falling; the first gripper and the second gripper are also equipped with photoelectric sensors to monitor whether the battery cell has fallen during the transportation process and provide timely feedback. Also, by setting the buffer component on the bracket, the risk of short circuit of the battery cell due to extrusion or damage to the device is avoided.

For better understanding and implementation, the present invention will be described in detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a perspective view of an anti-drop fixture suitable for battery testing equipment according to an embodiment of the present invention;

Fig. 2 is a partial exploded view of an anti-drop fixture suitable for battery testing equipment according to an embodiment of the present invention;

FIG. 3 is a perspective view of a cell clamping assembly of a drop-proof clamp suitable for battery testing equipment according to an embodiment of the present invention.

Reference numerals: cell clamping assembly 100, drive unit 110, rail slide cylinder 111, first speed regulating valve 112, second speed regulating valve 113, pressure reducing valve 114, pressure gauge 115, magnetic switch 116, gripper jaw Unit 120, first clamping jaw 121, first connecting arm 121A, first clamping arm 121B, second clamping jaw 122, second connecting arm 122A, second clamping arm 122B, through-beam photoelectric 123, anti-slip block 124, Bracket 200, fixed connection flange 210, first bracket 220, second bracket 230, first connecting plate 240, second connecting plate 250, first cylinder fixing plate 260, second cylinder fixing plate 270, buffer assembly 300, connection Rod 310 , linear bearing 320 , spring 330 .

Detailed ways

The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention.

It should be noted that when an element is referred to as being “fixed” to another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

Aiming at the technical problems in the background technology, the present invention provides an anti-drop clamp suitable for battery testing equipment, including a bracket 200 and a battery cell clamping assembly 100 . The bottom of the bracket 200 is connected to the cell clamping assembly 100, which is used to clamp the cell, and the bracket 200 can be connected to other mobile devices to drive the cell clamping assembly 100 to clamp and transport the cell.

The cell clamping assembly 100 includes a jaw unit 120 and a driving unit 110 . The driving unit 110 is connected to the bracket 200 , the driving end of the driving unit 110 is fixedly connected to the jaw unit 120 , and the driving unit 110 drives the jaw unit 120 to move to complete the cell clamping action.

Specifically, the driving unit 110 includes a guide rail sliding table cylinder 111 , a first speed regulating valve 112 , a second speed regulating valve 113 , a pressure reducing valve 114 , a pressure gauge 115 and a magnetic switch 116 . The first speed regulating valve 112 and the second speed regulating valve 113 are respectively connected with two air ports of the guide rail slide table cylinder 111, and the two sliding guide rails provided on the same horizontal line of the guide rail slide table cylinder 111, the first speed regulating valve 112 and the The second speed regulating valve 113 controls the actions of the two sliding guide rails on the guide rail slide table cylinder 111 . The decompression valve 114 can be set and fixed on the support 200 , and the decompression valve 114 is connected with the pressure gauge 115 and the cylinder 111 of the guide rail slide table. The decompression valve 114 can decompress the pressure of the air source and stabilize it to a fixed value, so that the first speed regulating valve 112 and the second speed regulating valve 113 can obtain stable air source power for adjusting and controlling the movement of the slide table cylinder 111. The sliding guide rail moves; the pressure relief valve 114 can also be manually opened in an emergency to reduce the air pressure in the guide rail slide table cylinder 111 and then manually open the cell clamping assembly 100 to remove the clamped cell. The pressure gauge 115 can be set and fixed on the bracket 200, and the pressure gauge 115 can monitor and display the pressure value in real time, and can get feedback in time when an abnormality occurs. The magnetic switch 116 is set in the top groove of the guide rail slide cylinder 111. When the piston with the magnetic ring inside the guide rail slide cylinder 111 moves to the position of the magnetic switch 116, the two metal reeds in the magnetic switch 116 will be on the magnetic switch. Under the action of the ring magnetic field, it pulls in and sends out a signal. When the piston moves away, the metal reed leaves the magnetic field, the contacts are automatically disconnected, and the signal is cut off. In this way, the detection of the position of the piston of the guide rail slide table cylinder 111 can be conveniently realized.

Wherein, the first speed regulating valve 112 and the second speed regulating valve 113 are pilot-operated one-way valves or three-position five-way solenoid valves with a middle seal. The exhaust port of the pilot-operated one-way valve needs to be ventilated before it can be opened. If the gas is cut off, the exhaust port will be automatically closed. The three-position five-way center-sealed solenoid valve uses a center-sealed form, and there are return springs at both ends. When the air system is powered off or the air is cut off, the return springs at both ends will press the solenoid valve to the middle position, so that the guide rail slide cylinder 111 can't get air in and out, so it can keep the cylinder in place. When the pilot-operated one-way valve or the three-position five-way solenoid valve with center seal occurs abnormal power or gas cut-off, the gas inside the guide rail slide cylinder 111 can be sealed in the guide rail slide cylinder 111 and cannot be discharged, so that the guide rail slide The sliding guide rail of the cylinder 111 remains motionless to avoid insufficient air pressure in the guide rail slide table cylinder 111 due to air outage, so that the gripper unit 120 can still hold the battery cell in the event of an air outage or power outage, realizing the protection function of air outage and power outage.

The jaw unit 120 includes a first jaw 121 and a second jaw 122 . The first clamping jaw 121 and the second clamping jaw 122 are respectively fixedly connected to two sliding guide rails on the same horizontal line as the guide rail slide table cylinder 111 . Specifically, the rail slide cylinder 111 is used to drive the first jaw 121 and the second jaw 122 to move toward or away from each other, so as to realize the action of the first jaw 121 and the second jaw 122 to grip the battery cell.

Specifically, the first clamping jaw 121 includes a first connecting arm 121A and a first clamping arm 121B, and the first connecting arm 121A is fixedly connected to the first clamping arm 121B and a sliding guide rail of the guide rail slide cylinder 111 respectively, wherein, The first connecting arm 121A is parallel to the moving direction of the sliding guide rail of the guide rail slide cylinder 111, and the first clamping arm 121B is perpendicular to the first connecting arm 121A; the second clamping jaw 122 includes a second connecting arm 122A and a second clamping arm 122B, the second connecting arm 122A is fixedly connected with the second clamping arm 122B and the other sliding guide rail of the guide rail slide cylinder 111, wherein the second connecting arm 122A is perpendicular to the moving direction of the slide guide rail of the guide rail slide cylinder 111, And the second clamping arm 122B is parallel to the first connecting arm 121A. Furthermore, the first clamping arm 121B includes a first clamping surface, and the second clamping arm 122B includes a second clamping surface opposite to the first clamping surface. When the guide rail slider cylinder 111 drives the first jaw 121 and the second jaw 122 to move toward each other, the first clamping surface and the second clamping surface move and clamp the cell; the guide rail slide cylinder 111 drives the first jaw 121 When moving opposite to the second clamping jaw 122 , the first clamping surface and the second clamping surface loosen the clamped battery cell.

In a preferred embodiment, anti-slip blocks 124 are provided on the first clamping surface and the second clamping surface. Specifically, the anti-skid block 124 may be a patterned polyurethane block. By setting the anti-slip block 124 on the first clamping surface and the second clamping surface, the frictional force can be increased at the place where the first clamping jaw 121 and the second clamping jaw 122 contact and clamp the electric core, and the clamping force of the electric core can be reduced. Risk of falling during the process.

In a preferred embodiment, the gripper unit 120 preferably includes a through-beam photoelectric 123 . The transmitting end of the through-light photoelectric 123 is set on the side of the first clamping arm 121B, and the receiving end of the through-light photoelectric 123 is set on the side of the second clamping arm 122B. The optical path formed by the through-beam photoelectric 123 passes through the position where the battery is clamped. When the battery is clamped, the light beam will be blocked, and the through-beam photoelectric 123 will output a signal to the control system, which can be used for real-time monitoring of the battery during the delivery of the battery. Core status, whether there is a drop phenomenon, and timely feedback.

In a preferred embodiment, the cell clamping assemblies 100 are arranged in two groups. During the process of clamping and transporting the battery cells, two sets of battery cell clamping assemblies 100 can work at the same time to improve the efficiency of battery cell handling.

The bracket 200 includes a fixed connecting flange 210 , a first bracket 220 , a second bracket 230 , a first connecting plate 240 , a second connecting plate 250 , a first cylinder fixing plate 260 and a second cylinder fixing plate 270 . Both sides of the fixed connection flange 210 are respectively connected to the first bracket 220 and the second bracket 230 , the first bracket 220 is connected to the first connecting plate 240 , and the second bracket 230 is connected to the second connecting plate 250 . The first connecting plate 240 is fixedly connected to the first cylinder fixing plate 260, the second connecting plate 250 is fixedly connected to the second cylinder fixing plate 270, and the first cylinder fixing plate 260 and the second cylinder fixing plate 270 can be respectively clamped with the battery cell Components 100 are connected. Specifically, the fixed connection flange 210 can be used to cooperate with a manipulator or other moving devices to drive the entire fixture to move and carry the battery cells.

In a preferred embodiment, a cushioning component 300 is also included to provide a cushioning force during the movement and avoid violent collisions. The buffer assembly 300 is arranged on the bracket 200 , connected between the first bracket 220 and the first connection plate 240 through the buffer assembly 300 , and connected between the second bracket 230 and the second connection plate 250 through the buffer assembly 300 . Specifically, the buffer assembly 300 includes a connecting rod 310 , a linear bearing 320 and a spring 330 . One end of a plurality of connecting rods 310 is fixedly connected to the first connecting plate 240 and the second connecting plate 250, and the other end passes through the first bracket 220 and the second bracket 230, and is arranged on the first bracket 220 and the second bracket 230 The linear bearing 320 is stuck on the top of the linear bearing 320, and the connecting rod 310 can slide on the linear bearing 320. The spring 330 is disposed on the connecting rod 310 between the first bracket 220 and the first connecting plate 240 and the second bracket 230 and the second connecting plate 250 , and the spring 330 is in a compressed state. When cells are stacked or the clip is subjected to abnormal collision when the moving fixture picks and unloads materials, the connecting rod 310 can slide towards the direction of the first bracket 220 or the second bracket 230, providing a buffer space and avoiding the short circuit of the cells due to extrusion hazard or damage to the equipment.

In a preferred embodiment, the control system sets the gripper pick-and-place memory according to the feedback signal from the photoelectric 123. When the battery cell clamping assembly 100 holds the battery, the control system will perform the gripper pick-and-place memory. . In the event of a power failure or gas failure and recovery, the cell clamping assembly 100 will be controlled not to open the first jaw 121 and the second jaw 122 according to the gripper pick-and-place memory when resetting, and the gripper pick-and-place memory needs to be manually cleared Only then can the batteries on the jaws be removed, so as to prevent the control system from directly opening the battery clamping assembly 100 that clamps the batteries after the power failure or gas failure recovery, so as to prevent the batteries from falling and causing danger.

According to the embodiment of the present invention, an anti-fall fixture suitable for battery testing equipment, the guide rail slide cylinder 111 is used to drive the first jaw 121 and the second jaw 122 to move towards each other or opposite to each other, so as to realize the first jaw 121 and the second jaw 122 The second jaw 122 clamps the action of the electric core; by setting the first speed regulating valve 112 and the second speed regulating valve 113 at the two vents of the guide rail slide cylinder 111 to automatically close the vents when the gas is cut off or the power is turned off, In the event of abnormal power failure or gas failure, the gas at both ends of the guide rail slide cylinder 111 can be sealed in the guide rail slide cylinder 111 and cannot be discharged, so that the sliding guide rail of the guide rail slide cylinder 111 can be kept still, and the guide rail slide cylinder 111 can be avoided due to gas failure. The air pressure is insufficient, so that the gripper unit 120 can still hold the battery cell in the event of a gas or power failure, preventing the risk of the battery cell falling in the event of an abnormal power failure or gas failure. Also by setting the decompression valve 114, the electric core can be manually removed in an emergency, and the pressure gauge 115 and the magnetic switch 116 are set to monitor and give feedback to the guide rail slide cylinder 111 in real time; in the first jaw 121 and the second jaw 122 An anti-slip block 124 is set on it to increase the frictional force and reduce the risk of the battery core falling; an on-beam photoelectric 123 is also set on the first jaw 121 and the second jaw 122 to monitor whether the battery core is falling during the transportation process, and timely feedback. Also, by arranging the buffer assembly 300 on the bracket 200 , it is possible to avoid short-circuiting of the battery cell or damage to the device due to extrusion.

An anti-drop fixture suitable for battery testing equipment described in the embodiments of the present invention is provided with a speed regulating valve that automatically closes the vent port when the gas is cut off or the power is cut off, which has the functions of preventing the battery cell from falling when the gas is cut off or the power is cut off, protecting the product and The advantages of ensuring production safety.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that, for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present invention, and the present invention is also intended to include these changes and modifications.

Claims (10)

1. The utility model provides a be suitable for battery check out test set's anchor clamps of preventing falling which characterized in that:

the battery cell clamping device comprises a support and a battery cell clamping assembly, wherein the battery cell clamping assembly is fixed on the support;

the battery cell clamping assembly comprises a driving unit and a clamping jaw unit, the driving unit comprises a guide rail sliding table cylinder, two air vents of the guide rail sliding table cylinder are respectively provided with a first speed regulating valve and a second speed regulating valve, and the first speed regulating valve and the second speed regulating valve are pilot-operated one-way valves or three-position five-way solenoid valves with middle seals;

the clamping jaw unit includes first clamping jaw and second clamping jaw, first clamping jaw with the second clamping jaw is fixed connection respectively on two sliding guide of the same water flat line of guide rail slip table cylinder, guide rail slip table cylinder is used for driving first clamping jaw with the second clamping jaw is in opposite directions or moves on the back mutually, wherein, first clamping jaw with the second clamping jaw is used for pressing from both sides and gets electric core.

2. The anti-falling clamp applicable to the battery detection equipment is characterized in that:

first clamping jaw includes first linking arm and first centre gripping arm, the second clamping jaw includes second linking arm and second centre gripping arm, first linking arm respectively with first centre gripping arm with a sliding guide of guide rail slip table cylinder connects, the second linking arm respectively with second centre gripping arm with another sliding guide of guide rail slip table cylinder connects, first centre gripping arm includes first clamping face, second centre gripping arm include with the second clamping face that first clamping face is relative.

3. The anti-falling clamp applicable to the battery detection equipment is characterized in that:

the first connecting arm is parallel to the moving direction of a sliding guide rail of the guide rail sliding table cylinder, and the first clamping arm is perpendicular to the first connecting arm;

the second connecting arm is perpendicular to the moving direction of the sliding guide rail of the guide rail sliding table cylinder, the second clamping arm is perpendicular to the second connecting arm, and the second clamping arm is parallel to the first connecting arm.

4. The anti-falling clamp applicable to the battery detection equipment as claimed in claim 3, wherein:

and the first clamping surface and the second clamping surface are provided with anti-skidding blocks.

5. The anti-falling clamp applicable to the battery detection equipment is characterized in that:

the antiskid blocks are polyurethane blocks with patterns.

6. The anti-falling clamp applicable to the battery detection equipment is characterized in that:

the clamping jaw unit further comprises a correlation photoelectric device, an emitting end of the correlation photoelectric device is arranged on the side edge of the first clamping arm, a receiving end of the correlation photoelectric device is arranged on the side edge of the second clamping arm, and a light path formed by the correlation photoelectric device passes through the position of the clamping electric core.

7. The anti-falling clamp applicable to the battery detection equipment is characterized in that:

the driving unit further comprises a pressure reducing valve, a pressure gauge and a magnetic switch, the pressure gauge is fixed on the support, and the pressure reducing valve is connected with the pressure gauge and the guide rail sliding table cylinder; the magnetic switch is arranged in a groove in the top of the guide rail sliding table cylinder and used for detecting the position of a piston of the guide rail sliding table cylinder.

8. A fall protection jig for battery test equipment as claimed in any one of claims 1 to 7, wherein:

the battery cell clamping assemblies comprise two groups.

9. The anti-falling clamp applicable to the battery detection equipment as claimed in claim 8, wherein:

the bracket comprises a fixed connecting flange, a first bracket, a second bracket, a first connecting plate, a second connecting plate, a first cylinder fixing plate and a second cylinder fixing plate, wherein the two sides of the fixed connecting flange are respectively connected with the first bracket and the second bracket, the first bracket is connected with the first connecting plate through a buffer assembly, and the second bracket is connected with the second connecting plate through the buffer assembly; the first connecting plate is fixedly connected with the first cylinder fixing plate, the second connecting plate is fixedly connected with the second cylinder fixing plate, and the first cylinder fixing plate and the second cylinder fixing plate are respectively connected with the battery cell clamping assembly.

10. The anti-falling clamp for the battery detection equipment as claimed in claim 9, wherein:

the buffer assembly comprises linear bearings, connecting rods and springs, one ends of the connecting rods are connected with the first connecting plate and the second connecting plate, the other ends of the connecting rods penetrate through the first support and the second support and penetrate through the linear bearings arranged on the first support and the second support to be clamped on the tops of the linear bearings, and the connecting rods can slide on the linear bearings; the springs are arranged on the connecting rods between the first bracket and the first connecting plate and between the second bracket and the second connecting plate.

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