Stator clamping mechanism

Abstract

The utility model relates to a stator clamping mechanism, which comprises a fixed abutting assembly and a movable clamping assembly, and is characterized in that the fixed abutting assembly comprises a fixed block which is fixedly arranged, and the fixed block abuts against the peripheral wall of a stator; the movable clamping assembly comprises a containing block and a movable block, a containing space is formed in the containing block, the movable block moves in the direction close to or away from the stator, a swing rod is rotationally connected to the movable block and comprises a first rod body and a second rod body which are connected, the first rod body and the second rod body are connected to form a V shape, and the first rod body is rotationally connected with the movable block. The second rod body is rotationally connected with a driving block, the driving block is arranged in the containing space in a sliding mode, the sliding direction of the driving block is perpendicular to the sliding direction of the movable block, the movable block is connected with a first spring, the first spring exerts acting force on the movable block to enable the movable block to move towards the stator, and a locking assembly used for locking the driving block is arranged at the position of the driving block. The stator clamping mechanism has the effects of reducing damage to the stator and improving the application range of the clamping mechanism.

Description

Technical Field

[0001] The utility model relates to the field of stator clamping mechanisms, in particular to a stator clamping mechanism. Background Art

[0002] A motor is an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic induction. The main function of a motor is to generate driving torque as a power source for electrical appliances or various machines.

[0003] The stator is an indispensable part of the motor and is the circuit part of the motor. It can be fed with three-phase alternating current to generate a rotating magnetic field. During the processing of the stator or the assembly of the stator and the rotor, the stator needs to be stably fixed on a workbench used for processing the stator or assembling the stator to realize the processing of the stator. Usually, a stator clamping mechanism is needed to clamp and fix the stator.

[0004] The existing stator clamping mechanism includes clamping plates that are arranged opposite to each other. The sides of the clamping plates that are away from each other are connected to cylinders. The piston rods of the cylinders are extended to drive the clamping plates to move in directions close to each other, so that the clamping plates are pressed against the stators. However, when the cylinders are used as driving sources, the clamping plates will exert a large impact force on the stators at the moment of contact with the stators, which may damage the stators. Moreover, if stators of different diameters are to be clamped, the movement stroke of the cylinder piston rod needs to be adjusted, so a PLC control system needs to be designed and used in conjunction with an electromagnetic valve. The process is complicated and the cost is high. Therefore, it is not convenient to fix stators of different diameters and the scope of application is low. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a stator clamping mechanism.

[0006] A stator clamping mechanism provided in this application adopts the following technical solution:

[0007] A stator clamping mechanism comprises a fixed clamping assembly and a movable clamping assembly, wherein the fixed clamping assembly comprises a fixedly arranged fixed block, wherein the fixed block abuts against the outer peripheral wall of the stator; wherein the movable clamping assembly comprises a receiving block and a movable block, wherein a receiving space for sliding the movable block is arranged in the receiving block, wherein the movable block moves in a direction approaching or away from the stator, and wherein the movable block and the fixed block are located on both sides of the radial direction of the stator;

[0008] The movable block is connected with a swing rod, and the swing rod is located on both sides of the width direction of the movable block, and the swing rod includes a first rod body and a second rod body connected to each other, and the first rod body and the second rod body are connected to each other in a V shape, and one end of the first rod body away from the second rod body is rotatably connected to the movable block, and one end of the second rod body away from the first rod body is rotatably connected to a driving block, and the driving block is slidably arranged in the accommodating space, and the sliding direction of the driving block is perpendicular to the sliding direction of the movable block, and the end of the movable block away from the stator is connected to a first spring, and the first spring applies a force to the movable block to make the movable block move toward the stator, and a locking component for locking the driving block is provided at the driving block;

[0009] The driving block has a locking position and a working position. When the driving block is in the locking position, the locking assembly locks the driving block to prevent the driving blocks from moving in a direction close to each other. At this time, the end of the first rod body connected to the movable block is tilted in a direction away from the stator, and the movable block does not abut against the stator.

[0010] After the locking assembly unlocks the driving block, the driving block is driven to slide in a direction approaching each other, driving the rocker arm to rotate, causing the end of the first rod body connected to the movable block to rotate in a direction approaching the stator, driving the movable block to slide in a direction approaching the stator until it abuts against the stator.

[0011] By adopting the above technical solution, when the stator does not need to be clamped, the locking assembly fixes the driving block in the locking position, and the movable block does not abut against the stator;

[0012] When the stator needs to be clamped, the stator is placed on the two fixed blocks so that the fixed blocks abut against the outer peripheral wall of the stator, and then the locking assembly locks the driving block, and the driving blocks are slid in the direction of approaching each other, driving the rocker rod to rotate, so that the end of the first rod body connected to the movable block rotates in the direction close to the stator, driving the movable block to slide in the direction close to the stator until it abuts against the stator, and under the action of the first spring, the movable block remains tightly against the stator. Since the first spring has elastic and buffering effects, the sliding of the driving block can be manually assisted in controlling the elasticity of the first spring to reduce the impact force on the stator, thereby reducing damage to the stator, and under the elastic action of the first spring, the moving stroke of the movable block can be adaptively adjusted, so as to facilitate the tight fixing of stators with different diameters, thereby improving the application range of the clamping mechanism and convenient operation of clamping the stator.

[0013] Preferably, a second spring is further provided in the accommodating space, one driving block corresponds to one second spring, one end of the second spring is connected to a side of the driving block away from the movable block, and the other end of the second spring abuts against the inner wall of the accommodating space, and the second spring applies a force to the driving blocks to make the driving blocks slide in a direction approaching each other.

[0014] By adopting the above technical solution, the second spring assists the manual operation of sliding the drive blocks toward each other, thereby improving the smoothness of the movement of the drive blocks.

[0015] Preferably, the angle between the first rod body and the second rod body at the connection point is an obtuse angle.

[0016] By adopting the above technical solution, under the premise that the swing angle of the first rod body is the same, the angle between the first rod body and the second rod body is an obtuse angle compared to an acute angle, which can reduce the distance the driving block needs to move, thereby improving the working efficiency of the clamping mechanism.

[0017] Preferably, two fixed blocks are arranged along the circumferential direction of the stator, and the connecting line of the two fixed blocks and one movable block forms an equilateral triangle structure.

[0018] By adopting the above technical solution and utilizing the structural stability principle of a triangle, the stability of the stator clamped by the clamping mechanism is improved by using two fixed blocks and one movable block.

[0019] Preferably, the fixed block and the movable block have a surface close to the stator that is curved.

[0020] By adopting the above technical solution, the fit between the fixed block, the movable block and the outer peripheral wall of the stator is improved, and the stability of the clamping mechanism in clamping the stator is further improved.

[0021] Preferably, first auxiliary side wings are integrally formed on both sides of one end of the fixing block close to the stator, and a surface of the first auxiliary side wing close to the stator is also an arc surface, and the arc surface of the first auxiliary side wing is transitionally connected to the arc surface of the fixing block.

[0022] By adopting the above technical solution, the contact area between the fixing block and the outer peripheral wall of the stator is increased, and the stability of clamping the stator is further improved.

[0023] Preferably, the movable block has second auxiliary side wings integrally formed on both sides of one end close to the stator, and a side of the second auxiliary side wing close to the stator is also curved, and the curved surface of the second auxiliary side wing is transitionally connected to the curved surface of the movable block.

[0024] By adopting the above technical solution, the contact area between the movable block and the outer peripheral wall of the stator is increased, and the stability of clamping the stator is further improved.

[0025] Preferably, a driving opening for the driving block to pass through is formed at one end of the accommodating block away from the stator, and the driving opening is communicated with the accommodating space;

[0026] The locking assembly comprises a mounting plate, on which two locking plates are slidably arranged, the sliding direction of the two locking plates being consistent with the sliding direction of the driving block, a first cylinder being arranged at one end of the locking plates away from each other, the first cylinder being mounted on the mounting plate, and a piston rod of the first cylinder being connected to the corresponding locking plate;

[0027] A limiting groove is formed on a surface of the locking plate away from the mounting plate, and the mounting plate slides in a direction close to or away from the accommodating block so that a portion of the driving block that passes through the driving opening enters or leaves the limiting groove;

[0028] The mounting plate is provided with a second cylinder, the cylinder body of the second cylinder is fixedly arranged, and the piston rod of the second cylinder is connected to the mounting plate to drive the mounting plate to slide towards or away from the accommodating block.

[0029] By adopting the above technical solution, when the driving block needs to be locked, the second cylinder drives the mounting plate to slide in the direction close to the accommodating block, so that the driving block penetrates into the corresponding limiting groove, and then the first cylinder drives the locking plate to slide in the direction away from each other until the driving block enters the locking position;

[0030] When unlocking is required, the second cylinder drives the mounting plate to slide in a direction away from the accommodating block until the driving block is disengaged from the limiting groove to achieve unlocking, and finally the first cylinder drives the locking plate to slide in a direction toward each other until it is reset.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. When the stator does not need to be clamped, the locking assembly fixes the driving block in the locking position, and the movable block does not abut against the stator;

[0033] When the stator needs to be clamped, the stator is placed on the two fixing blocks so that the fixing blocks abut against the outer peripheral wall of the stator, and then the locking assembly is released from the locking of the driving block, and the driving blocks are slid in the directions of approaching each other, driving the swing rod to rotate, so that the end of the first rod body connected to the movable block rotates in the direction close to the stator, driving the movable block to slide in the direction close to the stator until it abuts against the stator, and under the action of the first spring, the movable block remains tightly against the stator. Since the first spring has elastic and buffering effects, the sliding of the driving block can be manually assisted in controlling the impact force on the stator, and the elastic force of the first spring is cooperated to reduce the impact force on the stator, thereby reducing damage to the stator, and under the elastic action of the first spring, the moving stroke of the movable block can be adaptively adjusted, so as to facilitate the tight fixing of stators with different diameters, thereby improving the application range of the clamping mechanism and convenient operation of clamping the stator;

[0034] 2. The second spring assists the manual sliding of the drive blocks toward each other, thus improving the smoothness of the movement of the drive blocks;

[0035] 3. The structural stability principle of the triangle is utilized to improve the stability of the clamping mechanism in clamping the stator through two fixed blocks and one movable block. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of a stator clamping mechanism in an embodiment of the present application.

[0037] Figure 2 It is a schematic diagram of the overall cross-sectional structure used to illustrate the stator clamping mechanism in the embodiment of the present application.

[0038] Figure 3 It is a structural schematic diagram used to illustrate the locking assembly in the embodiment of the present application.

[0039] Explanation of the reference numerals: 1. fixed block; 11. first auxiliary wing; 2. accommodating block; 21. accommodating space; 22. driving port; 3. movable block; 31. second auxiliary wing; 32. baffle; 4. stator; 5. rocker arm; 51. first rod body; 52. second rod body; 6. driving block; 7. first spring; 8. second spring; 9. locking assembly; 91. mounting plate; 92. locking plate; 921. limiting groove; 93. first cylinder; 94. second cylinder. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-3 This application is described in further detail.

[0041] An embodiment of the present application discloses a stator clamping mechanism.

[0042] Reference Figure 1-3 The stator clamping mechanism includes a fixed clamping component and a movable clamping component. The fixed clamping component includes a fixedly arranged fixed block 1, and the fixed block 1 abuts against the outer peripheral wall of the stator 4. Two fixed blocks 1 are arranged along the circumference of the stator 4. The movable clamping component includes a receiving block 2 and a movable block 3. The receiving block 2 is provided with a receiving space 21 for the movable block 3 to slide, and the movable block 3 moves in a direction close to or away from the stator 4. The fixed block 1 and the movable block 3 have a curved surface on one side close to the stator 4, which improves the fit between the fixed block 1, the movable block 3 and the outer peripheral wall of the stator 4, and improves the stability of the clamping mechanism in clamping the stator 4.

[0043] The movable block 3 and the fixed block 1 are located on both sides of the stator 4 in the radial direction. The connecting line of the two fixed blocks 1 and one movable block 3 forms an equilateral triangle structure. By utilizing the structural stability principle of the triangle, the stability of the clamping mechanism clamping the stator 4 is improved by using two fixed blocks 1 and one movable block 3.

[0044] The movable block 3 is connected with a swing rod 5, which is located on both sides of the width direction of the movable block 3. The swing rod 5 includes a first rod body 51 and a second rod body 52 connected to each other. The first rod body 51 and the second rod body 52 are connected in a V shape, and the angle between the first rod body 51 and the second rod body 52 is an obtuse angle. On the premise that the swing angles of the first rod body 51 are the same, the angle between the first rod body 51 and the second rod body 52 is an obtuse angle, which can reduce the distance that the driving block 6 needs to move compared to an acute angle, thereby improving the working efficiency of the clamping mechanism.

[0045] One end of the first rod body 51 away from the second rod body 52 is rotatably connected to the movable block 3, and one end of the second rod body 52 away from the first rod body 51 is rotatably connected to the driving block 6. The driving block 6 is slidably arranged in the accommodating space 21. The sliding direction of the driving block 6 is perpendicular to the sliding direction of the movable block 3. One end of the movable block 3 away from the stator 4 is connected to the first spring 7. One end of the first spring 7 is connected to the movable block 3, and the other end of the first spring 7 abuts against the inner wall of the accommodating space 21. The first spring 7 applies a force to the movable block 3 to make the movable block 3 move toward the stator 4. A locking component 9 for locking the driving block 6 is provided at the driving block 6.

[0046] The driving block 6 has a locking position and a working position. When the driving block 6 is in the locking position, the locking assembly 9 locks the driving block 6 to prevent the driving block 6 from moving in a direction approaching each other. At this time, the end of the first rod body 51 connected to the movable block 3 is tilted in a direction away from the stator 4, and the movable block 3 does not abut against the stator 4.

[0047] After the locking assembly 9 unlocks the drive block 6, the drive block 6 is driven to slide in the direction of approaching each other, driving the rocker arm 5 to rotate, so that the end of the first rod body 51 connected to the movable block 3 rotates in the direction close to the stator 4, driving the movable block 3 to slide in the direction close to the stator 4 until it abuts against the stator 4.

[0048] When the stator 4 does not need to be clamped, the locking assembly 9 fixes the driving block 6 at the locking position, and the movable block 3 does not abut against the stator 4 . When the stator 4 needs to be clamped, the stator 4 is placed on the two fixing blocks 1 so that the fixing blocks 1 abut against the outer peripheral wall of the stator 4, and then the locking assembly 9 is released to lock the driving block 6, and the driving block 6 is slid in the direction of approaching each other, driving the rocker bar 5 to rotate, so that the end of the first rod body 51 connected to the movable block 3 rotates in the direction close to the stator 4, driving the movable block 3 to slide in the direction close to the stator 4 until it abuts against the stator 4, and under the action of the first spring 7, the movable block 3 remains tightly against the stator 4. Since the first spring 7 has elastic and buffering effects, the sliding of the driving block 6 can be manually assisted and controlled, and the elastic force of the first spring 7 is cooperated to reduce the impact force on the stator 4, thereby reducing damage to the stator 4, and under the elastic action of the first spring 7, the moving stroke of the movable block 3 can be adaptively adjusted, so as to facilitate the tight fixing of stators 4 with different diameters, thereby improving the application range of the clamping mechanism and convenient operation of clamping the stator 4.

[0049] A driving port 22 for the drive block 6 to pass through is provided at one end of the accommodating block 2 away from the stator 4, and the driving port 22 is communicated with the accommodating space 21. The locking assembly 9 includes a mounting plate 91, on which two locking plates 92 are slidably arranged, and the sliding direction of the two locking plates 92 is consistent with the sliding direction of the drive block 6. A first cylinder 93 is provided at one end of the locking plates 92 away from each other, and the first cylinder 93 is installed on the mounting plate 91, and the piston rod of the first cylinder 93 is connected to the corresponding locking plate 92. A limiting groove 921 is provided on one surface of the locking plate 92 away from the mounting plate 91, and the mounting plate 91 slides in a direction close to or away from the accommodating block 2 so that the part of the drive block 6 passing through the driving port 22 passes into or out of the limiting groove 921. A mounting frame is fixed on the workbench, and the mounting plate 91 is slidably arranged on the mounting frame, and the workbench and the mounting frame are not shown in the figure. A second cylinder 94 is disposed on the mounting plate 91 . The cylinder body of the second cylinder 94 is fixedly mounted on the mounting frame. The piston rod of the second cylinder 94 is connected to the mounting plate 91 to drive the mounting plate 91 to slide toward or away from the accommodating block 2 .

[0050] When the driving block 6 needs to be locked, the second cylinder 94 drives the mounting plate 91 to slide toward the direction close to the accommodating block 2, so that the driving block 6 passes into the corresponding limiting groove 921, and then the first cylinder 93 drives the locking plate 92 to slide in the direction away from each other until the driving block 6 enters the locking position.

[0051] When unlocking is required, the second cylinder 94 drives the mounting plate 91 to slide in a direction away from the accommodating block 2 until the driving block 6 is disengaged from the limiting groove 921 to achieve unlocking, and finally the first cylinder 93 drives the locking plate 92 to slide in a direction close to each other until it is reset.

[0052] A second spring 8 is also provided in the accommodation space 21. One drive block 6 corresponds to one second spring 8. One end of the second spring 8 is connected to a side of the drive block 6 away from the movable block 3. The other end of the second spring 8 abuts against the inner wall of the accommodation space 21. The second spring 8 applies a force to the drive block 6 to make the drive block 6 slide in a direction close to each other. The second spring 8 assists manual sliding of the drive block 6 in a direction close to each other, thereby improving the smoothness of the movement of the drive block 6.

[0053] First auxiliary side wings 11 are integrally formed on both sides of one end of the fixed block 1 close to the stator 4. The side of the first auxiliary side wing 11 close to the stator 4 is also curved. The curved surface of the first auxiliary side wing 11 is transitionally connected to the curved surface of the fixed block 1, thereby increasing the contact area between the fixed block 1 and the outer peripheral wall of the stator 4 and further improving the stability of clamping the stator 4.

[0054] Second auxiliary side wings 31 are integrally formed on both sides of one end of the movable block 3 close to the stator 4. The side of the second auxiliary side wing 31 close to the stator 4 is also curved. The curved surface of the second auxiliary side wing 31 is transitionally connected with the curved surface of the movable block 3, thereby increasing the contact area between the movable block 3 and the outer peripheral wall of the stator 4 and further improving the stability of clamping the stator 4.

[0055] Baffles 32 are provided on both sides of the thickness direction of one end of the movable block 3 close to the stator 4. The baffles 32 are located on both sides of the thickness direction of the outer ring of the stator 4 to abut and fix the stator 4 in the thickness direction.

[0056] The implementation principle of a stator clamping mechanism in the embodiment of the present application is:

[0057] When the stator 4 does not need to be clamped, the locking assembly 9 fixes the driving block 6 at the locking position, and the movable block 3 does not abut against the stator 4 .

[0058] When the stator 4 needs to be clamped, the stator 4 is placed on the two fixing blocks 1 so that the fixing blocks 1 abut against the outer peripheral wall of the stator 4, and then the locking assembly 9 is released to lock the driving block 6, and the driving block 6 is slid in the direction of approaching each other, driving the rocker bar 5 to rotate, so that the end of the first rod body 51 connected to the movable block 3 rotates in the direction close to the stator 4, driving the movable block 3 to slide in the direction close to the stator 4 until it abuts against the stator 4, and under the action of the first spring 7, the movable block 3 remains tightly against the stator 4. Since the first spring 7 has elastic and buffering effects, the sliding of the driving block 6 can be manually assisted and controlled, and the elastic force of the first spring 7 is cooperated to reduce the impact force on the stator 4, thereby reducing damage to the stator 4, and under the elastic action of the first spring 7, the moving stroke of the movable block 3 can be adaptively adjusted, so as to facilitate the tight fixing of stators 4 with different diameters, thereby improving the application range of the clamping mechanism and convenient operation of clamping the stator 4.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A stator (4) clamping mechanism, characterized in that: The invention comprises a fixed abutting assembly and a movable clamping assembly, wherein the fixed abutting assembly comprises a fixed block (1) which is fixedly arranged, and the fixed block (1) abuts against the outer peripheral wall of the stator (4); the movable clamping assembly comprises a receiving block (2) and a movable block (3), wherein a receiving space (21) for sliding the movable block (3) is arranged in the receiving block (2), and the movable block (3) moves in a direction approaching or moving away from the stator (4), and the movable block (3) and the fixed block (1) are located on both sides of the radial direction of the stator (4); The movable block (3) is connected to a swing rod (5), the swing rod (5) being located at both sides of the movable block (3) in a width direction, the swing rod (5) comprising a first rod body (51) and a second rod body (52) connected to each other, the first rod body (51) and the second rod body (52) being connected to each other in a V shape, one end of the first rod body (51) away from the second rod body (52) being rotatably connected to the movable block (3), one end of the second rod body (52) away from the first rod body (51) being rotatably connected to a driving block (6), the driving block (6) being slidably arranged in the accommodating space (21), the sliding direction of the driving block (6) being perpendicular to the sliding direction of the movable block (3), one end of the movable block (3) away from the stator (4) being connected to a first spring (7), the first spring (7) applying a force to the movable block (3) so as to move the movable block (3) toward the stator (4), and a locking assembly (9) for locking the driving block (6) being arranged at the driving block (6); The driving block (6) has a locking position and a working position. When the driving block (6) is in the locking position, the locking assembly (9) locks the driving block (6) to prevent the driving block (6) from moving in a direction approaching each other. At this time, the end of the first rod (51) connected to the movable block (3) is tilted in a direction away from the stator (4), and the movable block (3) does not abut against the stator (4). After the locking assembly (9) unlocks the drive block (6), the drive block (6) is driven to slide in a direction approaching each other, driving the swing rod (5) to rotate, causing the end of the first rod body (51) connected to the movable block (3) to rotate in a direction approaching the stator (4), driving the movable block (3) to slide in a direction approaching the stator (4) until it abuts against the stator (4).

2. A stator (4) clamping mechanism according to claim 1, characterized in that: A second spring (8) is also provided in the accommodating space (21), one driving block (6) corresponds to one second spring (8), one end of the second spring (8) is connected to a side of the driving block (6) away from the movable block (3), and the other end of the second spring (8) is in contact with an inner wall of the accommodating space (21), and the second spring (8) applies a force to the driving block (6) so as to make the driving blocks (6) slide in a direction approaching each other.

3. A stator (4) clamping mechanism according to claim 1, characterized in that: The angle between the first rod body (51) and the second rod body (52) at the connection point is an obtuse angle.

4. A stator (4) clamping mechanism according to claim 1, characterized in that: Two fixed blocks (1) are arranged along the circumference of the stator (4), and a connecting line between the two fixed blocks (1) and a movable block (3) forms an equilateral triangle structure.

5. A stator (4) clamping mechanism according to claim 1, characterized in that: The fixed block (1) and the movable block (3) have arc surfaces on their sides close to the stator (4).

6. A stator (4) clamping mechanism according to claim 5, characterized in that: First auxiliary side wings (11) are integrally formed on both sides of one end of the fixing block (1) close to the stator (4); a side of the first auxiliary side wing (11) close to the stator (4) is also an arc surface; the arc surface of the first auxiliary side wing (11) is transitionally connected to the arc surface of the fixing block (1).

7. A stator (4) clamping mechanism according to claim 5, characterized in that: Second auxiliary side wings (31) are integrally formed on both sides of one end of the movable block (3) close to the stator (4); a side of the second auxiliary side wing (31) close to the stator (4) is also an arc surface; the arc surface of the second auxiliary side wing (31) is transitionally connected to the arc surface of the movable block (3).

8. A stator (4) clamping mechanism according to claim 1, characterized in that: A driving opening (22) for the driving block (6) to pass through is formed at one end of the accommodating block (2) away from the stator (4), and the driving opening (22) is communicated with the accommodating space (21); The locking assembly (9) comprises a mounting plate (91), on which two locking plates (92) are slidably arranged, the sliding direction of the two locking plates (92) being consistent with the sliding direction of the driving block (6), a first cylinder (93) being arranged at one end of the locking plates (92) away from each other, the first cylinder (93) being mounted on the mounting plate (91), and a piston rod of the first cylinder (93) being connected to a corresponding locking plate (92); A limiting groove (921) is provided on a surface of the locking plate (92) away from the mounting plate (91), and the mounting plate (91) slides in a direction approaching or away from the accommodating block (2) so that the portion of the driving block (6) that passes through the driving opening (22) passes into or out of the limiting groove (921); A second cylinder (94) is arranged on the mounting plate (91); the cylinder body of the second cylinder (94) is fixedly arranged; and the piston rod of the second cylinder (94) is connected to the mounting plate (91) to drive the mounting plate (91) to slide in a direction approaching or moving away from the containing block (2).

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