Drag hook limiting structure for jack
By adopting a hook limiting structure on the jack, and utilizing components such as handle pins, limiting hooks, and limiting rods, the problem of unstable connection between the inner tube and the middle tube under vibration conditions is solved, achieving higher connection stability and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2026-03-13
AI Technical Summary
The existing jack's inner tube and middle tube limiting structure are prone to separation under vibration conditions, resulting in unstable connection and affecting performance.
The design employs a hook-and-lock structure, which combines a handle pin, a locking hook, a locking platform, and a locking rod to achieve a stable connection between the inner and middle tubes. Components such as support blocks, cylindrical blocks, and anti-vibration pads are used to enhance the connection stability.
It improves the connection stability between the inner tube and the middle tube, reduces the probability of shaking and collision caused by vibration, and enhances the stability of the jack in use.
Smart Images
Figure CN223990877U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of jack technology, and in particular to a hook limiting structure for jacks. Background Technology
[0002] Currently, bevel gear jacks control the initial height of the jack by adjusting the relative position of the inner tube and the middle tube, thereby increasing or decreasing the maximum extension range of the bevel gear jack to adapt to different load and working conditions.
[0003] The existing inner and middle tube adjustment structure achieves this through the thickness difference between them. Both the inner and middle tubes have grooves and protrusions respectively, which engage to form a locking structure and prevent the middle tube from detaching. This limiting method relies on the tight fit between the grooves and protrusions. However, when the grooves and protrusions of the inner and middle tubes are locked together, a rigid connection is formed. This connection cannot effectively cope with vibrations that may occur during jack use. Vibration can cause the grooves and protrusions to separate, resulting in relative movement between the inner and middle tubes. This leads to insufficient limiting effect, thus affecting the stability and performance of the jack.
[0004] In response to the aforementioned technologies, there is an urgent need for a limiting device for jacks that can improve the limiting effect of the middle tube and inner tube, and enhance the connection stability between the inner tube and the middle tube. Utility Model Content
[0005] To improve the connection stability between the inner tube and the middle tube, this application provides a hook limiting structure for a jack.
[0006] This application provides a hook limiting structure for a jack, adopting the following technical solution:
[0007] A hook limiting structure for a jack is disclosed. The hook limiting structure is used to limit the inner tube and middle tube of the jack. The inner tube has several through holes along the vertical direction. A handle pin is provided on the outside of the middle tube. The handle pin passes through the middle tube and the through holes in sequence. The handle pin is used to fix the middle tube and the inner tube. The hook limiting structure includes a limiting hook and a limiting platform. The limiting platform is located on the side of the middle tube away from the bottom of the jack. The limiting hook is set along the lifting direction of the jack. One end of the limiting hook is connected to the limiting platform, and the other end of the limiting hook is fixedly connected to the inside of the inner tube.
[0008] By adopting the above technical solution, the initial height of the jack can be adjusted by placing the handle pin in different through holes. One end of the limiting hook is welded to the inner tube, and the other end is connected to the limiting platform. The limiting platform abuts against the middle tube. The limiting hook and the limiting platform work together to limit the middle tube and the inner tube, thereby improving the connection stability between the inner tube and the middle tube.
[0009] Optionally, the limiting platform includes a support block and several limiting rods. The support block has a cavity on the side away from the bottom of the jack. The several limiting rods are arranged in parallel and pass through the support block. Both ends of the several limiting rods abut against the middle tube. The end of the limiting hook away from the bottom of the jack is sleeved on the outside of one of the limiting rods. The limiting hook is located between the support block and the middle tube.
[0010] By adopting the above technical solution, the lifting structure of the jack passes through the cavity, and the support block limits several limiting rods. The limiting rods are used to limit the middle tube, thereby improving the connection stability between the middle tube and the inner tube.
[0011] Optionally, the limit hook is equipped with a limit device for limiting the limit hook.
[0012] By adopting the above technical solution, the limiting device helps to reduce the probability of the limiting hook shaking when the jack is lifted, and improves the stability of the limiting hook.
[0013] Optionally, the limiting device includes several cylindrical blocks, which are sleeved on the outside of the limiting hook and fixedly connected to the limiting hook, with the outside of the cylindrical blocks fitting against the inner tube.
[0014] By adopting the above technical solution, the cylindrical block has isotropic mechanical properties and can withstand forces transmitted from all directions, further improving the stability of the limiting hook.
[0015] Optionally, both ends of the cylindrical block along the axial direction are chamfered.
[0016] By adopting the above technical solution, the chamfering treatment at both ends of the cylindrical block helps to reduce the probability of the edges of the cylindrical block colliding and improves the structural stability of the cylindrical block.
[0017] Optionally, the limiting hook is provided with several anti-vibration pads, which are located on the side of the cylindrical block away from the support block.
[0018] By adopting the above technical solution, the anti-vibration pad helps to reduce the collision between the limit hook and the inner tube during the jack lifting process, and improves the connection stability between the limit hook and the inner tube.
[0019] Optionally, the anti-vibration pad is provided with anti-vibration plates at both ends along the axial direction. The anti-vibration plates are sleeved on the outside of the limiting hook and fixedly connected to the limiting hook.
[0020] By adopting the above technical solution, the anti-vibration pads and anti-vibration mats work together to further improve the connection stability between the limit hook and the inner tube.
[0021] Optionally, the end of the limiting hook near the limiting platform is a ring, which is adapted to the limiting rod and is sleeved on the outside of the limiting rod.
[0022] By adopting the above technical solution, the ring is subjected to uniform force in all directions, which can effectively avoid stress concentration and local deformation, and improve the connection stability between the limit hook and the limit rod.
[0023] Optionally, the distance between the outer side of the support block and the central tube is adapted to the diameter of the limiting hook.
[0024] By adopting the above technical solution, the distance between the outer side of the support block and the middle tube is matched with the diameter of the limit hook, which helps to reduce the amplitude of the swaying of the limit hook during the jack lifting process and improves the stability of the limit hook during the jack lifting process.
[0025] In summary, this application includes at least one of the following beneficial technical effects:
[0026] 1. The support block limits the position of the limiting rod. The limiting rod abuts against the side of the middle tube away from the bottom of the jack. One end of the limiting hook is sleeved on the outside of the limiting rod, and the other end of the limiting hook is fixedly connected to the inside of the inner tube. The limiting rod and the limiting hook work together to limit the position of the inner tube and the middle tube, which improves the connection stability of the inner tube and the middle tube.
[0027] 2. The cylindrical block has isotropic mechanical properties, which can better withstand the force transmitted in all directions. The chamfering at both ends of the cylindrical block can reduce the collision of the edges at both ends of the cylindrical block and improve the stability of the limit hook.
[0028] 3. The end of the limit hook near the limit rod is a ring. The ring is subjected to uniform force in all directions, which can effectively avoid stress concentration and local deformation, and improve the connection stability between the limit hook and the limit rod. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of the overall structure of a hook limiting structure used in jacks.
[0030] Figure 2 This is a schematic diagram designed to highlight the connection between the hook limiting structure and the inner tube.
[0031] Figure 3 This is a schematic diagram designed to highlight the connection between the limiting platform and the limiting hook.
[0032] Figure 4 This is a schematic diagram designed to highlight the positional relationship between the cylindrical block and the shock-absorbing plate.
[0033] Explanation of reference numerals in the attached drawings: 1. Hook limiting structure; 11. Limiting platform; 111. Support block; 112. Limiting rod; 12. Limiting hook; 121. Ring; 13. Limiting device; 131. Cylindrical block; 14. Anti-vibration pad; 15. Anti-vibration plate; 2. Handle pin; 21. Inner tube; 22. Middle tube; 23. Through hole. Detailed Implementation
[0034] The present application will be further described in detail below with reference to all the accompanying drawings.
[0035] This application discloses a hook limiting structure for a jack. Example
[0036] Reference Figure 1 and Figure 2 A hook limiting structure for a jack is disclosed. The hook limiting structure 1 is used to limit the inner tube 21 and the middle tube 22 of the jack. The inner tube 21 has several through holes 23 vertically. The middle tube 22 is provided with a handle pin 2 on the outside. The handle pin 2 is located in different through holes 23 to adjust the initial height of the jack and to position the inner tube 21 and the middle tube 22.
[0037] Reference Figure 2 and Figure 3 The hook limiting structure 1 includes a limiting hook 12 and a limiting platform 11. The limiting platform 11 is located at the end of the middle tube 22 away from the jack base. The end of the limiting hook 12 near the bottom of the jack is fixedly connected to the inner side of the inner tube 21. The other end of the limiting hook 12 is connected to the limiting platform 11. The limiting hook 12 limits the limiting platform 11. The limiting platform 11 and the limiting hook 12 cooperate to improve the connection stability between the inner tube 21 and the middle tube 22.
[0038] Reference Figure 3 The limiting platform 11 includes a support block 111 and multiple limiting rods 112. The support block 111 has a cavity on the side away from the bottom of the jack. The lifting structure of the jack passes through the cavity. The multiple limiting rods 112 are arranged in parallel and pass through the support block 111. The support block 111 limits the limiting rods 112. Both ends of the multiple limiting rods 112 abut against the middle tube 22. The middle tube 22 supports the limiting rods 112. The end of the limiting hook 12 away from the bottom of the jack is sleeved on the outside of one of the limiting rods 112. The limiting hook 12 and the middle tube 22 cooperate to make the limiting rod 112 located on the side of the middle tube 22 away from the bottom of the jack, thereby limiting the middle tube 22 and the inner tube 21.
[0039] Reference Figure 3 The end of the limiting hook 12 near the limiting rod 112 is a ring 121. The ring 121 is adapted to the limiting rod 112 and is sleeved on the outside of the limiting rod 112. The ring 121 is subjected to uniform force in all directions, which can effectively avoid stress concentration and local deformation. The distance between the outer side of the support block 111 and the middle tube 22 is adapted to the diameter of the limiting hook 12, which helps to reduce the amplitude of the swaying of the limiting hook 12 during the lifting of the jack and improves the stability of the limiting hook 12 during the lifting of the jack.
[0040] Reference Figure 3 and Figure 4 A limiting device 13 is provided on the limiting hook 12 to limit its movement. The limiting device 13 includes multiple cylindrical blocks 131, which are sleeved on the outside of the limiting hook 12 and fixedly connected to it. The outer side of the cylindrical blocks 131 fits against the inner tube 21. The cylindrical blocks 131 help reduce the range of motion of the limiting hook 12. The cylindrical blocks 131 have isotropic mechanical properties and can withstand forces transmitted from all directions, thus improving the stability of the limiting hook 12. Both ends of the cylindrical blocks 131 along their length are chamfered, which helps reduce the probability of the edges of the cylindrical blocks 131 colliding and improves the structural stability of the cylindrical blocks 131.
[0041] Reference Figure 3 and Figure 4 The limiting hook 12 is also provided with multiple anti-vibration pads 14, which correspond one-to-one with the cylindrical blocks 131. The anti-vibration pads 14 are located on the side of the cylindrical blocks 131 away from the support blocks 111. The anti-vibration pads 14 help to reduce the collision between the limiting hook 12 and the inner tube 21 during the lifting process of the jack. Both ends of the anti-vibration pads 14 along the axial direction are provided with anti-vibration plates 15. The anti-vibration plates 15 are sleeved on the outside of the limiting hook 12 and fixedly connected to the limiting hook 12. The anti-vibration plates 15 and the anti-vibration pads 14 cooperate to improve the connection stability between the limiting hook 12 and the inner tube 21.
[0042] The implementation principle of the hook limiting structure for a jack in this application embodiment is as follows: the support block 111 limits the limiting rod 112. One end of the limiting rod 112 is fixedly connected to the inner tube 21, and the other end is sleeved on the outside of the limiting rod 112. The limiting hook 12 and the limiting rod 112 cooperate to limit the inner tube 21 and the middle tube 22. The outer side of the cylindrical block 131 fits against the inner tube 21, reducing the shaking of the limiting hook 12 when the jack is lifted. The anti-vibration pad 14 and the anti-vibration plate 15 cooperate to further reduce the probability of the limiting hook 12 shaking and improve the connection stability of the inner tube 21 and the middle tube 22.
[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A pull hook limiting structure for a jack, the pull hook limiting structure (1) is used for limiting an inner tube (21) and a middle tube (22) of a jack, characterized in that: The inner tube (21) is vertically opened with a plurality of through holes (23), the middle tube (22) is provided with a handle latch (2), the handle latch (2) sequentially passes through the middle tube (22) and the through hole (23), the handle latch (2) is used for fixing the middle tube (22) and the inner tube (21), the draw hook limiting structure (1) comprises a limiting draw hook (12) and a limiting table (11), the limiting table (11) is located on the side of the middle tube (22) away from the bottom of the jack, the limiting draw hook (12) is arranged in the jack jacking direction, one end of the limiting draw hook (12) is connected with the limiting table (11), and the other end of the limiting draw hook (12) is fixedly connected to the inner side of the inner tube (21).
2. The pull hook position limiting structure for the jack according to claim 1, wherein: The limiting table (11) comprises a supporting block (111) and a plurality of limiting rods (112), the side of the supporting block (111) away from the bottom of the jack is provided with a cavity, the plurality of limiting rods (112) are arranged in parallel and pass through the supporting block (111), the two ends of the plurality of limiting rods (112) are in abutment with the middle tube (22), one end of the limiting draw hook (12) away from the bottom of the jack is sleeved on the outer side of one of the limiting rods (112), and the limiting draw hook (12) is located between the supporting block (111) and the middle tube (22).
3. The pull hook position limiting structure for the jack according to claim 1, wherein: The limiting device (13) is arranged on the limiting draw hook (12) and is used for limiting the limiting draw hook (12).
4. The pull hook position limiting structure for the jack according to claim 3, characterized in that: The limiting device (13) comprises a plurality of cylindrical blocks (131), the plurality of cylindrical blocks (131) are sleeved on the outer side of the limiting draw hook (12) and are fixedly connected with the limiting draw hook (12), and the outer side of the cylindrical block (131) is attached to the inner tube (21).
5. The structure for limiting the pull hook of the jack according to claim 4, wherein: The two ends of the cylindrical block (131) in the axial direction are chamfered.
6. The pull hook position limiting structure for the jack according to claim 2, wherein: The limiting draw hook (12) is provided with a plurality of shockproof pads (14), and the plurality of shockproof pads (14) are located on the side of the cylindrical block (131) away from the supporting block (111).
7. The structure for limiting the pull hook of the jack according to claim 6, wherein: The shockproof pad (14) is provided with a shockproof sheet (15) at both ends in the axial direction, the shockproof sheet (15) is sleeved on the outer side of the limiting draw hook (12) and is fixedly connected with the limiting draw hook (12).
8. The pull hook position limiting structure for the jack according to claim 2, characterized in that: The end of the limiting draw hook (12) close to the limiting table (11) is a circular ring (121), the circular ring (121) is matched with the limiting rod (112), and the circular ring (121) is sleeved on the outer side of the limiting rod (112).
9. The structure for limiting the pull hook of the jack according to claim 4, wherein: The distance between the outer side of the supporting block (111) and the middle tube (22) is matched with the diameter of the limiting draw hook (12).