Pig mating assisting supporting frame for veterinarian
By designing an adjustable veterinary-grade pig mating support frame, the problems of equipment instability and unreliable fixation were solved, enabling efficient and safe pig mating operations, and improving the service life of the equipment and the comfort of adult pigs.
Patent Information
- Application Number
- CN202423095610.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Existing pig breeding equipment suffers from instability, unreliable securing of adult pigs, insufficient cushioning systems, and a lack of effective anti-collision protection and automatic adjustment functions, resulting in short service life and compromised comfort and safety.
A veterinary-grade pig breeding support frame has been designed, featuring an adjustable mounting base, a telescopic guide rod, a return spring, and an openable guardrail. Combined with upper and lower fixing components, it provides elastic support and stable fixation. Mechanical stability and flexibility are achieved through guide grooves and sliding blocks. Anti-collision blocks and a buffer system are provided to protect the equipment and the pigs.
It improves breeding efficiency, reduces the difficulty of manual operation, enhances the stability and durability of the equipment, ensures the comfort and safety of adult pigs, and extends the service life of the equipment.
Smart Images
Figure CN223488977U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mating equipment technology, and in particular to a veterinary auxiliary pig mating support frame. Background Technology
[0002] With the development of modern animal husbandry, especially the continuous advancement of adult pig breeding technology, traditional manual breeding methods face problems such as low efficiency, high labor intensity, and potential adverse effects on the health of adult pigs. Therefore, using mechanized equipment for assisted breeding has become an important direction for improving breeding efficiency, ensuring animal welfare, and optimizing production processes. Most existing adult pig breeding auxiliary equipment adopts a fixed structure, which has defects such as inflexible adjustment, narrow application range, and inconvenient operation, making it difficult to adapt to adult pigs of different sizes and different operational needs.
[0003] To address the aforementioned issues, several novel auxiliary breeding support devices have been proposed in recent years, employing adjustable structures and elastic support mechanisms to better adapt to different usage scenarios. However, existing technologies still face problems such as equipment instability, insecure fixation of adult pigs, and insufficient cushioning systems. Particularly during the lifting, fixing, and releasing processes, the lack of effective anti-collision protection and automatic adjustment functions results in a shorter equipment lifespan and fails to adequately guarantee the comfort and safety of adult pigs. Therefore, this invention proposes a veterinary auxiliary pig breeding support frame to meet the need for sufficient support and fixation of adult pigs during breeding, reducing the difficulty of manual operation. Utility Model Content
[0004] In view of this, the purpose of this utility model is to propose a veterinary auxiliary pig mating support frame to solve the problems of unstable equipment and unreliable fixation of adult pigs in the prior art.
[0005] To achieve the above objectives, this utility model provides a veterinary auxiliary pig mating support frame, including a mounting base. The mounting base has multiple sets of mounting rods, and each mounting rod has multiple sets of protective rails that are openable and closable. The mounting base also has multiple sets of first guide rods, each guide rod being telescopic. A lifting plate is located at the top of each first guide rod, and a first return spring is sleeved on each first guide rod. One end of the first return spring is located at the top of the mounting base, and the other end is located at the bottom of the lifting plate. A set of guide rods is located at the top of each mounting rod, and a guide groove is formed within each guide rod. An upper fixing component is slidably disposed within the guide groove. A lower fixing component is located on the mounting base. The upper fixing component is used to fix the adult pig to be mated from above, and the lower fixing component is used to assist in fixing the adult pig to be mated from below.
[0006] Preferably, the upper fixing assembly includes a sliding block slidably disposed in the guide groove, a second guide rod disposed at the bottom of the sliding block, a connecting rod disposed at the bottom of the second guide rod, a second return spring sleeved on the second guide rod, one end of the second return spring disposed at the bottom of the sliding block, the other end of the second return spring disposed on the connecting rod, a contact saddle disposed at the bottom of the connecting rod, an extension plate disposed on the contact saddle, and the contact saddle contacts the back of the adult pig.
[0007] Preferably, the lower fixing assembly includes a set of support cylinders disposed on the mounting base. A deflection arm is rotatably disposed on the support cylinder, and a synchronizing block is rotatably disposed between the deflection arms. The top of the synchronizing block contacts the bottom of the lifting plate. A lifting arm is disposed at the other end of the deflection arm. A contact base plate is disposed at the top of the lifting arm. A support side plate is vertically disposed on one side of the contact base plate. A third guide rod is disposed on the support side plate. A contact arc plate is disposed at one end of the third guide rod. A third return spring is sleeved on the third guide rod. One end of the third return spring is disposed on one side of the support side plate, and the other end of the third return spring is disposed on one side of the contact arc plate.
[0008] Preferably, the lifting plate is provided with a set of sliding grooves, the connecting rod is provided with a set of moving rods, the moving rods are slidably disposed in the sliding grooves, and the lifting arm passes through the sliding grooves.
[0009] Preferably, the bottom of the lifting plate is provided with multiple sets of anti-collision blocks, and the top of the mounting base is provided with multiple sets of contact plates that are adapted to the positions of the anti-collision blocks.
[0010] Preferably, the contact arc plate is an arc shape that bends to one side, and the side of the contact arc plate that bends inward contacts the adult pig. The side of the contact arc plate that bends inward is provided with a friction groove.
[0011] Preferably, a release plate is rotatably provided on one side of the lifting plate, and rotating rods are rotatably provided on both sides of the release plate. The rotating rods are mounted on a support base, and the support base is located on top of the mounting base.
[0012] Preferably, the top of the mounting base is provided with a set of fixed seats, one end of the fixed seats is provided with a pull rod, the pull rod is provided with a limit ring, the limit ring is provided with a return spring, the pull rod is a telescopic structure, one end of the pull rod is connected to the support cylinder, and the support cylinder is slidable on the top of the mounting base.
[0013] The beneficial effects of this utility model are:
[0014] 1. Multiple sets of mounting rods on the mounting base support and fix the protective fence to protect adult pigs. During mating, the protective fence can be opened and closed for easy adjustment and operation. The first guide rod is a telescopic structure with a lifting plate at the top. Combined with the first return spring, it provides elastic support to ensure that the lifting plate can rise and fall stably during operation. The top of the mounting rod is equipped with a guide rod with an internal guide groove. The upper and lower fixing components are used to fix the adult pigs to be mated from above and below, respectively, effectively assisting the mating operation. This ensures that the adult pigs are fully supported and fixed during mating, reducing the difficulty of manual operation and improving mating efficiency. The telescopic first guide rod and the openable and closable protective fence make the equipment more flexible to use, allowing the working state to be adjusted according to different needs, ensuring the safety and accuracy of operation. At the same time, the first return spring can automatically return to the support position after operation, reducing the burden of equipment maintenance and adjustment, and enhancing the stability and durability of the equipment.
[0015] 2. When the adult pig enters the lifting platform, its weight causes the platform to descend along the axis of the first guide rod. Simultaneously, the moving rod descends, which in turn lowers the connecting rod. This allows the contact saddle and extension plate to approach the pig's back, effectively contacting and supporting it, reducing discomfort, and improving the stability of the pig's fixation. As the pig moves on the lifting platform during this process, the contact saddle moves accordingly. The sliding block slides within the guide groove, effectively preventing mechanical jamming and wear. This ensures the contact saddle moves with the pig, achieving continuous and stable fixation, reducing manual intervention, and improving the safety and efficiency of the mating operation.
[0016] 3. When the adult pig enters the lifting platform, its weight causes the platform to descend along the axis of the first guide rod. At this point, the bottom of the lifting platform contacts the synchronous block, causing the deflection arm to rotate within the support cylinder. This, in turn, causes the lifting arm to rise within the sliding groove, allowing the contact plate to preferentially contact the pig's abdomen. Combined with the fixing components, this achieves overall positioning and fixation of the pig. Simultaneously, the third return spring, under the elastic force of the third guide rod, pushes the contact arc plate to contact the side of the pig. The friction groove enhances the contact effect, improving the stability of the fixation and reducing discomfort to the pig. This allows the equipment to flexibly adapt to adult pigs of different sizes, improving its applicability and ease of operation. This comprehensive fixation of the pig ensures its stability during mating.
[0017] 4. After the adult pigs have finished mating, the pull rod is reset under the elastic force of the return spring. At this time, the support cylinder can be moved by pulling the rod, which can achieve the reset effect of the support cylinder, ensuring the continuous use of the equipment, simplifying the reset operation of the equipment, reducing the burden of manual adjustment, and effectively improving the use effect.
[0018] 5. After mating, simply step on the release plate to rotate it around the axis of the rotating rod. Through the lever principle, the release plate drives the lifting plate connected to it to rise, allowing the upper and lower fixed components to separate from the adult pigs. This allows the adult pigs to move away from one side along the lifting plate, ensuring the continuity of mating. The bottom of the lifting plate is equipped with multiple sets of anti-collision blocks. These anti-collision blocks cooperate with the contact plate on the top of the mounting base. When the lifting plate contacts the contact plate during the lifting process, the anti-collision blocks buffer and reduce the impact, preventing damage to mechanical parts. The cooperation between the release plate and the rotating rod allows for smooth control of the lifting process, effectively avoiding excessive impact or unnecessary mechanical pressure. The cooperation between the anti-collision blocks and the contact plate helps reduce the impact when the lifting plate approaches the mounting base, improving the stability and service life of the equipment, effectively protecting the mechanical structure, reducing wear, and extending the overall service life of the equipment. At the same time, through the buffering effect, it reduces harm to the adult pigs, ensuring the safety and comfort of operation during mating. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a first-person perspective schematic diagram of the present invention;
[0021] Figure 2 This is a schematic diagram of the protective railing in the open state of this utility model;
[0022] Figure 3 This is a schematic diagram of the lifting plate of this utility model;
[0023] Figure 4 This is a schematic diagram of the fixing component of this utility model;
[0024] Figure 5 This is a schematic diagram of the release plate of this utility model;
[0025] Figure 6 This is a schematic diagram of the synchronization block of this utility model;
[0026] Figure 7This is a schematic diagram of the contact arc plate of this utility model.
[0027] The markings in the diagram are as follows: 1. Mounting base; 2. Mounting rod; 3. Guardrail; 4. First guide rod; 5. First return spring; 6. Lifting plate; 7. Sliding groove; 8. Guide rod; 9. Guide groove; 10. Sliding block; 11. Second guide rod; 12. Second return spring; 13. Connecting rod; 14. Contact saddle; 15. Extension plate; 16. Moving rod; 17. Release plate; 18. Anti-collision block; 19. Contact plate; 20. Support cylinder; 21. Deflection arm; 22. Synchronization block; 23. Lifting arm; 24. Support side plate; 25. Third guide rod; 26. Third return spring; 27. Contact arc plate; 28. Friction groove; 29. Contact base plate; 30. Fixed seat; 31. Pulling rod; 32. Return spring; 33. Supporting base; 34. Rotating rod. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.
[0029] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0030] like Figures 1-7As shown, a veterinary auxiliary pig breeding support frame includes a mounting base 1, multiple sets of mounting rods 2 on the mounting base 1, multiple sets of protective rails 3 on the mounting rods 2 (the protective rails 3 are openable and closable), multiple sets of first guide rods 4 on the mounting base 1 (the first guide rods 4 are telescopic), a lifting plate 6 on the top of the first guide rods 4, and a first return spring 5 sleeved on the first guide rods 4 (one end of the first return spring 5 is located on the top of the mounting base 1, and the other end of the first return spring 5 is located on the bottom of the lifting plate 6), a set of guide rods 8 on the top of the mounting rods 2 (the guide rods 8 have guide grooves 9 inside, and an upper fixing component is slidably disposed in the guide grooves 9), and a lower fixing component on the mounting base 1; the upper fixing component is used to fix the adult pig to be bred from above; the lower fixing component is used to assist in fixing the adult pig to be bred from below.
[0031] Multiple mounting rods 2 on the mounting base 1 support and fix the protective fence 3 to protect adult pigs. During mating, the protective fence 3 can be opened and closed for easy adjustment and operation. The first guide rod 4 is a telescopic structure with a lifting plate 6 at the top. Combined with the first return spring 5, it provides elastic support to ensure that the lifting plate 6 can be raised and lowered stably during operation. The top of the mounting rod 2 is equipped with a guide rod 8 with an internal guide groove 9. The upper and lower fixing components are used to fix the adult pigs to be mated from above and below, respectively, effectively assisting the mating operation. This allows the adult pigs to be fully supported and fixed during mating, reducing the difficulty of manual operation and improving mating efficiency. The telescopic first guide rod 4 and the openable and closable protective fence 3 make the equipment more flexible to use, allowing the working state to be adjusted according to different needs, ensuring the safety and accuracy of operation. At the same time, the first return spring 5 can automatically return to the support position after operation, reducing the burden of equipment maintenance and adjustment, and enhancing the stability and durability of the equipment.
[0032] like Figure 1 , Figure 2 and Figure 4 As shown, the upper fixing assembly includes a sliding block 10 slidably disposed in the guide groove 9. A second guide rod 11 is disposed at the bottom of the sliding block 10. A connecting rod 13 is disposed at the bottom of the second guide rod 11. A second return spring 12 is sleeved on the second guide rod 11. One end of the second return spring 12 is disposed at the bottom of the sliding block 10, and the other end of the second return spring 12 is disposed on the connecting rod 13. A contact saddle 14 is disposed at the bottom of the connecting rod 13. An extension plate 15 is disposed on the contact saddle 14. The contact saddle 14 contacts the back of the adult pig. A set of sliding grooves 7 are opened on the lifting plate 6. A set of moving rods 16 are disposed on the connecting rod 13. The moving rods 16 are slidably disposed in the sliding grooves 7. The lifting arm 23 passes through the sliding grooves 7.
[0033] When the adult pig enters the lifting plate 6, its weight causes the lifting plate 6 to descend along the axis of the first guide rod 4. Simultaneously, the moving rod 16 descends, and the connecting rod 13 descends as well. This allows the contact saddle 14 and the extension plate 15 to simultaneously approach the pig's back, effectively contacting and supporting it, reducing discomfort, and improving the stability of the pig's fixation. The pig's back is now firmly fixed. During this fixation process, the pig moves on the lifting plate 6, causing the contact saddle 14 to move simultaneously. The sliding block 10 slides within the guide groove 9, effectively preventing mechanical jamming and wear. This ensures that the contact saddle 14 moves with the pig, achieving continuous and stable fixation, reducing manual intervention, and improving the safety and efficiency of the mating operation.
[0034] like Figure 3 , Figures 5-7 As shown, the lower fixing assembly includes a set of support cylinders 20 mounted on the mounting base 1. A deflection arm 21 is rotatably mounted on the support cylinder 20, and a synchronizing block 22 is rotatably mounted between the deflection arms 21. The top of the synchronizing block 22 contacts the bottom of the lifting plate 6. A lifting arm 23 is mounted at the other end of the deflection arm 21. A contact base plate 29 is mounted at the top of the lifting arm 23. A support side plate 24 is vertically mounted on one side of the contact base plate 29. A third guide rod 25 is mounted on the support side plate 24. A contact arc plate 27 is mounted at one end of the third guide rod 25. A third return spring 26 is sleeved on the third guide rod 25. The end of the third return spring 26 is located on one side of the support side plate 24, and the other end of the third return spring 26 is located on one side of the contact arc plate 27. The contact arc plate 27 is an arc that bends to one side. The side of the contact arc plate 27 that bends inward contacts the adult pig. A friction groove 28 is provided on the side of the contact arc plate 27 that bends inward. A set of fixed seats 30 is provided on the top of the mounting base 1. A pull rod 31 is provided on one end of the fixed seat 30. A limit ring is provided on the pull rod 31. A return spring 32 is provided inside the limit ring. The pull rod 31 is a telescopic structure. One end of the pull rod 31 is connected to the support cylinder 20. The support cylinder 20 can slide on the top of the mounting base 1.
[0035] When the adult pig enters the lifting plate 6, its weight causes the lifting plate 6 to descend along the axis of the first guide rod 4. At this time, the bottom of the lifting plate 6 contacts the synchronous block 22, which causes the deflection arm 21 to rotate in the support cylinder 20, thereby causing the lifting arm 23 to rise in the sliding groove 7. Therefore, the contact bottom plate 29 can preferentially contact the abdomen of the adult pig. With the help of the fixing components, the overall positioning and fixing of the adult pig can be achieved. At the same time, the third return spring 26 pushes the contact arc plate 27 to contact the side of the adult pig under the elastic force of the third guide rod 25. The friction groove 28 enhances the contact effect, which helps to improve the stability of the fixing and reduce discomfort to the adult pig. It also allows the equipment to flexibly adapt to adult pigs of different body sizes, improving the applicability and ease of operation of the equipment. At this time, the adult pig can be fully fixed, ensuring the stability of the adult pig during the mating process.
[0036] Furthermore, after the adult pigs have finished mating, the pull rod 31 is reset under the elastic force of the return spring 32. At this time, the support cylinder 20 can be moved by pulling the rod 31, which can achieve the reset effect of the support cylinder 20, ensuring the continuous use of the equipment, simplifying the reset operation of the equipment, reducing the burden of manual adjustment, and effectively improving the use effect.
[0037] like Figure 5 As shown, a release plate 17 is rotatably provided on one side of the lifting plate 6, and a rotating rod 34 is rotatably provided on both sides of the release plate 17. The rotating rod 34 is provided on the support base 33, and the support base 33 is provided on the top of the mounting base 1. Multiple sets of anti-collision blocks 18 are provided at the bottom of the lifting plate 6, and multiple sets of contact plates 19 that are adapted to the positions of the anti-collision blocks 18 are provided at the top of the mounting base 1.
[0038] Simultaneously, after the adult pigs have finished mating, simply stepping on the release plate 17 causes it to rotate around the axis of the rotating rod 34. Through the lever principle, the release plate 17 drives the lifting plate 6, which is rotatably connected to it, to rise. At this time, the upper and lower fixing components can be separated from the adult pigs, allowing the adult pigs to move away to one side along the lifting plate 6, ensuring the continuity of mating. The bottom of the lifting plate 6 is equipped with multiple sets of anti-collision blocks 18. These anti-collision blocks cooperate with the contact plate 19 on the top of the mounting base 1. When the lifting plate 6 contacts the contact plate 19 during the lifting process, the anti-collision blocks 18... It can buffer and reduce impact force to avoid damage to mechanical parts; through the cooperation of release plate 17 and rotating rod 34, the lifting process of lifting plate 6 can be smoothly controlled, effectively avoiding excessive impact or unnecessary mechanical pressure. The cooperation of anti-collision block 18 and contact plate 19 helps to reduce the impact when lifting plate 6 approaches mounting base 1, improve the stability and service life of equipment, effectively protect mechanical structure, reduce wear, and extend the overall service life of equipment. At the same time, through the buffering effect, it reduces harm to adult pigs and ensures the safety and comfort of operation during mating.
[0039] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.
[0040] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A veterinary-grade pig breeding support frame, comprising a mounting base (1), characterized in that, The mounting base (1) is provided with multiple sets of mounting rods (2), and the mounting rods (2) are provided with multiple sets of guardrails (3). The guardrails (3) are openable and closable. The mounting base (1) is provided with multiple sets of first guide rods (4). The first guide rods (4) are telescopic structures. The top of the first guide rods (4) is provided with a lifting plate (6). The first guide rods (4) are fitted with a first return spring (5). One end of the first return spring (5) is located at the top of the mounting base (1), and the other end of the first return spring (5) is located at the bottom of the lifting plate (6). The top of the mounting rods (2) is provided with a set of guide rods (8). The guide rods (8) are provided with guide grooves (9). The upper fixing component is slidably arranged in the guide grooves (9). The mounting base (1) is provided with a lower fixing component. The upper fixing component is used to fix the adult pigs to be bred from above; The lower fixing component is used to assist in fixing the adult pigs that need to be bred from below.
2. The veterinary auxiliary pig mating support frame according to claim 1, characterized in that, The upper fixing assembly includes a sliding block (10) slidably disposed in the guide groove (9). A second guide rod (11) is disposed at the bottom of the sliding block (10). A connecting rod (13) is disposed at the bottom of the second guide rod (11). A second return spring (12) is sleeved on the second guide rod (11). One end of the second return spring (12) is disposed at the bottom of the sliding block (10). The other end of the second return spring (12) is disposed on the connecting rod (13). A contact saddle (14) is disposed at the bottom of the connecting rod (13). An extension plate (15) is disposed on the contact saddle (14). The contact saddle (14) contacts the back of the adult pig.
3. A veterinary auxiliary pig mating support frame according to claim 2, characterized in that, The lower fixing assembly includes a set of support cylinders (20) disposed on the mounting base (1). A deflection arm (21) is rotatably disposed on the support cylinder (20). A synchronization block (22) is rotatably disposed between the deflection arms (21). The top of the synchronization block (22) is in contact with the bottom of the lifting plate (6). A lifting arm (23) is disposed at the other end of the deflection arm (21). A contact base plate (29) is disposed at the top of the lifting arm (23). A support side plate (24) is vertically disposed on one side of the contact base plate (29). A third guide rod (25) is disposed on the support side plate (24). A contact arc plate (27) is disposed at one end of the third guide rod (25). A third return spring (26) is sleeved on the third guide rod (25). One end of the third return spring (26) is disposed on one side of the support side plate (24), and the other end of the third return spring (26) is disposed on one side of the contact arc plate (27).
4. A veterinary auxiliary pig mating support frame according to claim 3, characterized in that, The lifting plate (6) is provided with a set of sliding grooves (7), and the connecting rod (13) is provided with a set of moving rods (16). The moving rods (16) are slidably disposed in the sliding grooves (7), and the lifting arm (23) passes through the sliding grooves (7).
5. A veterinary auxiliary pig mating support frame according to claim 4, characterized in that, The bottom of the lifting plate (6) is provided with multiple sets of anti-collision blocks (18), and the top of the mounting base (1) is provided with multiple sets of contact plates (19) that are adapted to the positions of the anti-collision blocks (18).
6. A veterinary auxiliary pig mating support frame according to claim 3, characterized in that, The contact arc plate (27) is an arc-shaped plate that bends to one side. The side of the contact arc plate (27) that bends inward contacts the adult pig. A friction groove (28) is provided on the side of the contact arc plate (27) that bends inward.
7. A veterinary auxiliary pig mating support frame according to claim 1, characterized in that, A release plate (17) is rotatably provided on one side of the lifting plate (6), and a rotating rod (34) is rotatably provided on both sides of the release plate (17). The rotating rod (34) is provided on the support base (33), and the support base (33) is provided on the top of the mounting base (1).
8. A veterinary auxiliary pig mating support frame according to claim 5, characterized in that, The top of the mounting base (1) is provided with a set of fixed seats (30), one end of the fixed seats (30) is provided with a pull rod (31), the pull rod (31) is provided with a limit ring, the limit ring is provided with a return spring (32), the pull rod (31) is a telescopic structure, one end of the pull rod (31) is connected to the support cylinder (20), and the support cylinder (20) is slidable on the top of the mounting base (1).