Stroke adjusting mechanism for high-precision press machine

Abstract

The stroke adjusting mechanism comprises a main body assembly, a punching machine, a punching rod, a punching plate and a guide plate, the punching rod is arranged on one side of the punching machine, the punching plate is located below the punching rod, the guide plate is arranged on the outer side of the punching plate in a sleeved mode, and the guide plate is arranged on the outer side of the punching plate. The guide plate is movably connected with the stamping plate, the adjusting assembly is arranged on the stamping plate and comprises an adjusting part, a driving part and a fixing part, and the adjusting part is arranged on the stamping plate. The punch adjusting device has the advantages that the height of the punch can be adjusted through clamping block type adjustment, the clamping block type punch does not need to be regularly maintained and lubricated like a bolt adjusting mode, the maintenance cost can be reduced, the maintenance workload is reduced, the problems of thread abrasion, looseness and the like are solved, the service life of equipment can be prolonged, and the service life of the equipment is prolonged. And equipment faults caused by improper maintenance are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of punching machines, in particular to a stroke regulating mechanism for high-precision presses. Background Art

[0002] A punch press is a mechanical equipment used for metal processing, mainly used for blanking, punching, forming and other processing operations on metal sheets. A punch press is usually composed of a frame, a slide, a punch, a mold and other components. The punch is quickly pressed down in the vertical direction through a pressure mechanism to perform stamping processing on metal materials. During the punching process, the impact depth of the punch on the workpiece can be controlled by adjusting the stroke of the punch, thereby achieving adjustment for different processing requirements. In the prior art, the height of the punch is usually adjusted by a bolt rotation adjustment method. The bolt rotation adjustment method requires regular maintenance and lubrication, has a high maintenance cost, and is prone to problems such as thread wear and loosening, affecting the stability and reliability of the equipment. Utility Model Content

[0003] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0004] In view of the above and / or existing problems in the stroke adjustment mechanism for a high-precision press, the present utility model is proposed.

[0005] Therefore, the problem to be solved by the utility model is that in the prior art, the height of the punch is usually adjusted by a bolt rotation adjustment method. The bolt rotation adjustment method requires regular maintenance and lubrication, has a high maintenance cost, and is prone to problems such as thread wear and loosening, affecting the stability and reliability of the equipment.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a stroke adjustment mechanism for a high-precision press, comprising a main assembly, including a punch, a punching rod, a punching plate and a guide plate, wherein the punching rod is arranged on one side of the punch, the punching plate is located below the punching rod, the guide plate is sleeved on the outside of the punching plate, and the guide plate and the punching plate are movably connected;

[0007] The adjusting component is arranged on the stamping plate, and comprises an adjusting member, a driving member and a fixing member. The adjusting member is arranged on the stamping plate, the driving member is located on the adjusting member, and the fixing member is arranged on one side of the adjusting member.

[0008] As a preferred solution of the stroke adjustment mechanism for the high-precision press machine described in the utility model, the adjustment member includes an adjustment rod and an adjustment block, the adjustment rod is fixed to the bottom of the stamping rod, the adjustment rod is inserted into the top of the stamping plate, the adjustment rod and the stamping plate are movably connected, and the adjustment block is arranged on one side of the adjustment rod.

[0009] As a preferred solution of the stroke adjustment mechanism for the high-precision press machine described in the utility model, wherein: the adjustment member also includes a movable plate, a positioning plate and a protective frame, the movable plate is hinged to one side of the adjustment block, the positioning plate is movably connected to one side of the movable plate, and the protective frame is sleeved on the outside of the movable plate.

[0010] As a preferred solution of the stroke adjustment mechanism for the high-precision press machine described in the utility model, the adjustment member also includes a rotating shaft, a torsion spring and a rotating disk, the rotating shaft is fixed to one side of the adjustment block, the rotating disk is fixed to one end of the rotating shaft, one end of the torsion spring is fixed to one side of the movable plate, and the other end is fixed to one side of the rotating disk.

[0011] As a preferred solution of the stroke adjustment mechanism for the high-precision press machine described in the utility model, the driving member includes a push rod and a driving rod, the push rod is hinged to one end of the movable plate, and the driving rod is fixed to one end of the push rod.

[0012] As a preferred solution of the stroke adjustment mechanism for the high-precision press machine described in the utility model, the driving member also includes a lever, a support seat and a handle, the lever is fixed to one side of the driving rod, the support seat is hinged to the bottom of the lever, and the handle is fixed to the top of the lever.

[0013] As a preferred solution of the stroke adjustment mechanism for the high-precision press of the utility model, the fixing member includes a fixing sleeve and a moving rod, the fixing sleeve is arranged on one side of the adjusting rod, and the moving rod is fixed to one side of the fixing sleeve.

[0014] As a preferred solution of the stroke adjustment mechanism for the high-precision press machine described in the utility model, wherein: the fixing part also includes a support sleeve and a hinge block, the support sleeve is arranged on the outside of the moving rod, the support sleeve and the moving rod are movably connected, and the hinge block is hinged to one end of the moving rod.

[0015] As a preferred solution of the stroke adjustment mechanism for the high-precision press machine described in the utility model, the fixing member further includes a movable rod and a connecting plate, the movable rod is hinged to one side of the hinge block, and the connecting plate is hinged to one side of the movable rod.

[0016] As a preferred solution of the stroke adjustment mechanism for the high-precision press machine described in the utility model, the fixing part also includes a movable disk, a spring, a limit block and a fixed plate, the movable disk is fixed to one side of the movable rod, the spring is fixed to the inner wall of the movable disk, the limit block is fixed to one end of the spring, the fixed plate is sleeved on the outside of the limit block, and the fixed plate and the limit block are movably connected.

[0017] The beneficial effects of the utility model are as follows: the height of the punch can be adjusted by using the block-type adjustment, and the block-type punch does not require regular maintenance and lubrication like the bolt adjustment method, which can reduce maintenance costs and workload, avoid problems such as thread wear and loosening, extend the service life of the equipment, and reduce equipment failures caused by improper maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0019] Figure 1 This is the overall structure diagram of the stroke adjustment mechanism for a high-precision press.

[0020] Figure 2 This is a structural diagram of the stamping plate of the stroke adjustment mechanism for a high-precision press.

[0021] Figure 3 For high-precision press stroke adjustment mechanism Figure 2 A partial enlarged structural diagram in the middle.

[0022] Figure 4 This is a structural diagram of the adjustment rod of the stroke adjustment mechanism for a high-precision press.

[0023] Figure 5 For high-precision press stroke adjustment mechanism Figure 4 A partial enlarged structural diagram of point B in the middle.

[0024] Figure 6 This is the structural diagram of the limit block of the stroke adjustment mechanism for high-precision presses. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1

[0029] Reference Figure 1 to Figure 6 , which is the first embodiment of the utility model. This embodiment provides a stroke adjustment mechanism for a high-precision press. The stroke adjustment mechanism for a high-precision press includes a main body component 100 and an adjustment component 200. The two can cooperate to adjust the height of the punch. Unlike the bolt adjustment method, regular maintenance and lubrication are not required, which can reduce maintenance costs and reduce maintenance workload.

[0030] The main body component 100 includes a punch 101, a punching rod 102, a punching plate 103 and a guide plate 104. The punching rod 102 is arranged on one side of the punch 101, the punching plate 103 is located below the punching rod 102, the guide plate 104 is sleeved on the outside of the punching plate 103, and the guide plate 104 and the punching plate 103 are movably connected.

[0031] The punch press 101 is a mechanical equipment used for metal processing, mainly used for blanking, punching, forming and other processing operations on metal plates. When the workpiece needs to be punched, the workpiece is first placed on the punch press 101, and then the punch rod 102 is started. The punch rod 102 will drive the punch plate 103 to move, and the workpiece is squeezed by the punch plate 103 so that the workpiece can be punched. The movement mode of the punch rod 102 is a slider crank mechanism. The movement of the punch rod 102 belongs to the prior art, so no further explanation is given. There are two guide plates 104, both of which are fixed on one side of the punch press 101. The setting of the guide plate 104 can guide the punch plate 103 to prevent the punch plate 103 from offsetting during movement.

[0032] The adjusting assembly 200 is disposed on the stamping plate 103 , and includes an adjusting member 201 , a driving member 202 and a fixing member 203 . The adjusting member 201 is disposed on the stamping plate 103 , the driving member 202 is located on the adjusting member 201 , and the fixing member 203 is disposed on one side of the adjusting member 201 .

[0033] The height of the stamping plate 103 can be adjusted by setting the adjusting member 201, so that the stroke of the stamping plate 103 can be adjusted. By adjusting the stroke of the stamping plate 103, the impact depth of the stamping plate 103 on the workpiece can be controlled, so as to achieve adjustment of different processing requirements. The driving member 202 is used to drive the adjusting member 201 to move, so that the adjusting member 201 can adjust the height of the stamping plate 103. After the height of the stamping plate 103 is adjusted to the specified position, the stamping plate 103 can be fixed by setting the fixing member 203 to prevent the stamping plate 103 from falling.

[0034] Example 2

[0035] Reference Figure 1 to Figure 6 , which is the second embodiment of the utility model, and this embodiment is based on the previous embodiment.

[0036] Specifically, the adjusting member 201 includes an adjusting rod 201a and an adjusting block 201b. The adjusting rod 201a is fixed to the bottom of the stamping rod 102, and the adjusting rod 201a is plugged into the top of the stamping plate 103. The adjusting rod 201a and the stamping plate 103 are movably connected, and the adjusting block 201b is arranged on one side of the adjusting rod 201a.

[0037] A movable groove corresponding to the adjusting block 201b is provided on one side of the adjusting rod 201a. When the height of the stamping plate 103 needs to be adjusted, the adjusting block 201b is moved. At this time, the adjusting block 201b will move on the movable groove. The adjusting block 201b squeezes the movable groove to drive the adjusting rod 201a to move. The distance between the two can be changed by moving the adjusting rod 201a on the stamping plate 103, so that the stroke of the stamping plate 103 can be adjusted.

[0038] Specifically, the adjusting member 201 further includes a moving plate 201c, a positioning plate 201d and a protective frame 201e. The moving plate 201c is hinged to one side of the adjusting block 201b, the positioning plate 201d is movably connected to one side of the moving plate 201c, and the protective frame 201e is sleeved on the outside of the moving plate 201c.

[0039] When the adjustment block 201b needs to be moved, the movement of the moving plate 201c can drive the adjustment block 201b to move. There are two positioning plates 201d, both of which are fixed on the top of the stamping plate 103. The positioning plate 201d can be set to support the moving plate 201c to prevent the moving plate 201c from shifting. The protective frame 201e is fixed on the top of the stamping plate 103, and the protective frame 201e is used to protect the moving plate 201c.

[0040] Specifically, the adjusting member 201 also includes a rotating shaft 201f, a torsion spring 201g and a rotating disk 201h. The rotating shaft 201f is fixed to one side of the adjusting block 201b, the rotating disk 201h is fixed to one end of the rotating shaft 201f, one end of the torsion spring 201g is fixed to one side of the moving plate 201c, and the other end is fixed to one side of the rotating disk 201h.

[0041] When the stamping plate 103 needs to be lowered, the adjusting block 201b is toggled so that the adjusting block 201b moves and separates from the moving groove, and the stamping plate 103 can then be lowered. When the adjusting block 201b is toggled, the rotating shaft 201f can be driven to rotate, and the rotating shaft 201f can apply a twisting force to the torsion spring 201g when rotating. When it is necessary to prevent the stamping plate 103 from continuing to descend, the adjusting block 201b is released, and at this time, the rotating force of the torsion spring 201g can drive the adjusting block 201b to move and re-engage with the moving groove, and by doing this reciprocating motion, the stamping plate 103 can be gradually lowered, preventing the stamping plate 103 from directly descending to generate noise and cause injury to personnel.

[0042] Specifically, the driving member 202 includes a pressing rod 202a and a driving rod 202b. The pressing rod 202a is hinged to one end of the moving plate 201c, and the driving rod 202b is fixed to one end of the pressing rod 202a.

[0043] When the height of the stamping plate 103 needs to be adjusted, the driving rod 202b is moved, and the driving rod 202b can drive the lower pressure rod 202a to move. The lower pressure rod 202a can make one end of the movable plate 201c tilt by moving. At this time, the other end of the movable plate 201c will be lifted up, and the lifting of the movable plate 201c will drive the adjusting block 201b to squeeze the movable groove, and the stamping plate 103 can be driven to move one section, and then the driving rod 202b is returned to its original position, and the movable plate 201c will form a horizontal state. At this time, the adjusting block 201b will enter the next movable groove, and then the height of the stamping plate 103 can be adjusted again by this reciprocating movement, and the height of the stamping plate 103 can be gradually adjusted by this reciprocating movement, thereby improving the adjustment accuracy.

[0044] Specifically, the driving member 202 further includes a lever 202c, a support seat 202d and a handle 202e. The lever 202c is fixed to one side of the driving rod 202b. The support seat 202d is hinged to the bottom of the lever 202c. The handle 202e is fixed to the top of the lever 202c.

[0045] The lever 202c can drive the driving rod 202b to move by moving left and right, making it easier for the staff to adjust the height of the stamping plate 103. The support seat 202d is fixed to the top of the stamping plate 103, and a baffle is provided on one side of the support seat 202d to prevent the driving rod 202b from tipping over. The setting of the handle 202e is convenient for the user to move the lever 202c.

[0046] Specifically, the fixing member 203 includes a fixing sleeve 203a and a moving rod 203b. The fixing sleeve 203a is disposed on one side of the adjusting rod 201a, and the moving rod 203b is fixed to one side of the fixing sleeve 203a.

[0047] After the stamping plate 103 is adjusted to the specified height, in order to prevent the stamping plate 103 from falling unsteadily during stamping, the fixed sleeve 203a is moved to contact one side of the adjusting rod 201a. At this time, the movable groove on the adjusting rod 201a will engage with the fixed frame on the top of the stamping plate 103, thereby limiting the stamping plate 103 and preventing the stamping plate 103 from moving on its own. After the stamping plate 103 is limited, the adjusting rod 201a will have a slight tilt, but the normal angle of descent of the stamping plate 103 can still be guaranteed through the setting of the guide plate 104, which will not affect the stamping of the workpiece by the stamping plate 103, and the moving rod 203b is used to drive the fixed sleeve 203a to move.

[0048] Example 3

[0049] Reference Figure 1 to Figure 6 , which is the third embodiment of the utility model, and this embodiment is based on the first two embodiments.

[0050] Specifically, the fixing member 203 further includes a support sleeve 203c and a hinge block 203d. The support sleeve 203c is sleeved on the outside of the moving rod 203b. The support sleeve 203c and the moving rod 203b are movably connected. The hinge block 203d is hinged to one end of the moving rod 203b.

[0051] The support sleeve 203c is fixed to the top of the stamping plate 103. The support sleeve 203c can support the moving rod 203b to prevent the moving rod 203b from deviating when moving. The hinge block 203d can drive the moving rod 203b to move by moving.

[0052] Specifically, the fixing member 203 further includes a movable rod 203e and a connecting plate 203f. The movable rod 203e is hinged to one side of the hinge block 203d, and the connecting plate 203f is hinged to one side of the movable rod 203e.

[0053] The hinge block 203d can be moved by moving the movable rod 203e. There are two connecting plates 203f, both fixed on the top of the stamping plate 103. The connecting plates 203f are used to support the movable rod 203e to prevent the movable rod 203e from deflecting.

[0054] Specifically, the fixing member 203 also includes a movable disk 203g, a spring 203h, a limit block 203i and a fixed plate 203j. The movable disk 203g is fixed to one side of the movable rod 203e, the spring 203h is fixed to the inner wall of the movable disk 203g, the limit block 203i is fixed to one end of the spring 203h, the fixed plate 203j is sleeved on the outside of the limit block 203i, and the fixed plate 203j and the limit block 203i are movably connected.

[0055] A slide groove is provided in the movable disk 203g, and a slider is sleeved on the outer side of the limit block 203i. The slider slides in the slide groove. The slide block can slide in the slide groove to make the limit block 203i slide in the movable disk 203g and will not fall off. The fixed plate 203j is fixed to the top of the stamping plate 103, and a guide groove is opened on one side of the fixed plate 203j. The limit block 203i slides in the guide groove. When the movable rod 203e is moved, the movable disk 203g can be driven to rotate. The rotation of the movable disk 203g can drive the limit block 203i to slide in the guide groove. When the limit block 203i slides in the guide groove, a pulling force can be applied to the spring 203h. After the movable disk 203g is rotated to the specified position, the limit block 203i will enter the fixed groove on one side of the guide groove through the rebound force of the spring 203h. At this time, the movable disk 203g can be limited to prevent the movable disk 203g from reversing.

[0056] During use, when the height of the stamping plate 103 needs to be adjusted, it is first necessary to release the limit on the movable disk 203g, and move the limit block 203i to separate the limit block 203i from the fixed groove and enter the guide groove. Then the movable rod 203e can be moved, and the movable rod 203e can be moved to drive the hinge block 203d to move, and the movement of the hinge block 203d drives the moving rod 203b to move, and the movement of the moving rod 203b drives the fixed sleeve 203a to move, so that the fixed sleeve 203a is separated from the adjusting rod 201a. At this time, the movable groove on the adjusting rod 201a will be separated from the fixed frame at the top of the stamping plate 103.

[0057] Then the handle 202e is moved, and the handle 202e drives the lever 202c to move, and the lever 202c drives the driving rod 202b to move. By moving the driving rod 202b, the driving rod 202b can drive the pressing rod 202a to move, and the pressing rod 202a can make one end of the movable plate 201c tilt by moving. At this time, the other end of the movable plate 201c will be lifted, and the lifting of the movable plate 201c will drive the adjusting block 201b to squeeze the movable groove, and at this time, the stamping plate 103 can be driven to move one section, and then the driving rod 202b is returned to its original position, and the movable plate 201c will form a horizontal state. At this time, the adjusting block 201b will enter the next movable groove, and then the height of the stamping plate 103 can be adjusted again by this reciprocating movement, and the height of the stamping plate 103 can be gradually adjusted by this reciprocating movement.

[0058] When the stamping plate 103 needs to be lowered, the adjusting block 201b is toggled. When the adjusting block 201b is toggled, the rotating shaft 201f can be driven to rotate. When the rotating shaft 201f moves, it can apply a torsional force to the torsion spring 201g, and the adjusting block 201b moves and separates from the moving groove. At this time, the stamping plate 103 can be lowered. When it is necessary to prevent the stamping plate 103 from continuing to descend, the adjusting block 201b is released. At this time, the rotating force of the torsion spring 201g can drive the adjusting block 201b to move and re-engage with the moving groove. By doing this reciprocating, the stamping plate 103 can be gradually lowered to prevent the stamping plate 103 from directly descending to generate noise and cause damage to personnel. After the adjustment is completed, the fixing sleeve 203a can be used to limit the adjusting rod 201a to prevent the stamping plate 103 from moving by itself. Although the block will also have wear problems, compared with the bolt adjustment method, the block-type punch head still has less wear and tear, and is easier to replace and maintain.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A stroke adjustment mechanism for a high-precision press, characterized in that: include, A main body component (100) comprises a punching machine (101), a punching rod (102), a punching plate (103) and a guide plate (104), wherein the punching rod (102) is arranged on one side of the punching machine (101), the punching plate (103) is located below the punching rod (102), the guide plate (104) is sleeved on the outside of the punching plate (103), and the guide plate (104) and the punching plate (103) are movably connected; The adjusting component (200) is arranged on the stamping plate (103), and comprises an adjusting member (201), a driving member (202) and a fixing member (203); the adjusting member (201) is arranged on the stamping plate (103), the driving member (202) is located on the adjusting member (201), and the fixing member (203) is arranged on one side of the adjusting member (201).

2. The stroke adjustment mechanism for a high-precision press machine according to claim 1, characterized in that: The adjusting member (201) comprises an adjusting rod (201a) and an adjusting block (201b); the adjusting rod (201a) is fixed to the bottom of the punching rod (102); the adjusting rod (201a) is plugged into the top of the punching plate (103); the adjusting rod (201a) and the punching plate (103) are movably connected; and the adjusting block (201b) is arranged on one side of the adjusting rod (201a).

3. The stroke adjustment mechanism for a high-precision press machine according to claim 2, characterized in that: The adjusting member (201) further comprises a moving plate (201c), a positioning plate (201d) and a protective frame (201e); the moving plate (201c) is hinged to one side of the adjusting block (201b); the positioning plate (201d) is movably connected to one side of the moving plate (201c); and the protective frame (201e) is sleeved on the outside of the moving plate (201c).

4. The stroke adjustment mechanism for a high-precision press machine according to claim 3, characterized in that: The adjusting member (201) further comprises a rotating shaft (201f), a torsion spring (201g) and a rotating disk (201h); the rotating shaft (201f) is fixed to one side of the adjusting block (201b); the rotating disk (201h) is fixed to one end of the rotating shaft (201f); one end of the torsion spring (201g) is fixed to one side of the moving plate (201c); and the other end is fixed to one side of the rotating disk (201h).

5. The stroke adjustment mechanism for a high-precision press machine according to claim 3 or 4, characterized in that: The driving member (202) comprises a lower pressing rod (202a) and a driving rod (202b), wherein the lower pressing rod (202a) is hinged to one end of the movable plate (201c), and the driving rod (202b) is fixed to one end of the lower pressing rod (202a).

6. The stroke adjustment mechanism for a high-precision press machine according to claim 5, characterized in that: The driving member (202) further comprises a lever (202c), a support seat (202d) and a handle (202e); the lever (202c) is fixed to one side of the driving rod (202b); the support seat (202d) is hinged to the bottom of the lever (202c); and the handle (202e) is fixed to the top of the lever (202c).

7. The stroke adjustment mechanism for a high-precision press machine according to claim 6, characterized in that: The fixing member (203) comprises a fixing sleeve (203a) and a moving rod (203b); the fixing sleeve (203a) is arranged on one side of the adjusting rod (201a); and the moving rod (203b) is fixed to one side of the fixing sleeve (203a).

8. The stroke adjustment mechanism for a high-precision press machine according to claim 7, characterized in that: The fixing member (203) further comprises a supporting sleeve (203c) and a hinge block (203d), wherein the supporting sleeve (203c) is sleeved on the outside of the moving rod (203b), the supporting sleeve (203c) and the moving rod (203b) are movably connected, and the hinge block (203d) is hinged to one end of the moving rod (203b).

9. The stroke adjustment mechanism for a high-precision press machine according to claim 8, characterized in that: The fixing member (203) further comprises a movable rod (203e) and a connecting plate (203f), wherein the movable rod (203e) is hinged to one side of the hinge block (203d), and the connecting plate (203f) is hinged to one side of the movable rod (203e).

10. The stroke adjustment mechanism for a high-precision press machine according to claim 9, characterized in that: The fixing member (203) further comprises a movable disk (203g), a spring (203h), a limit block (203i) and a fixing plate (203j); the movable disk (203g) is fixed to one side of the movable rod (203e); the spring (203h) is fixed to the inner wall of the movable disk (203g); the limit block (203i) is fixed to one end of the spring (203h); the fixing plate (203j) is sleeved on the outside of the limit block (203i); and the fixing plate (203j) and the limit block (203i) are movably connected.

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