Lifting hook with limiting pin
By designing a hook with limit pins, automatic decoupling is achieved using limit pins and brittle materials, the problems of decoupling risks in the initial stage of lifting and the natural swing of the hook are solved, and lifting efficiency and safety are improved.
Patent Information
- Application Number
- CN202422298926.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-20
AI Technical Summary
When a hook with limit pin is used on a crane, the hook is heavy, causing the counterweight parts to be below when the weight is not lifted, and it is difficult to adjust the hook, and it is difficult to manually operate when lifting at multiple points. There is a risk of decoupling in the early stage of lifting, and there is a safety hazard for natural swing of the hook.
A hook with a limiting pin is designed, including a connecting rod, a hook body rotatably arranged on the connecting rod, and the hook and the connecting rod are connected by a limiting pin. When the hook is hanging heavy objects, the limit pin breaks and the hook is in a vertical state, and automatic decoupling is achieved through the lever principle. The limit pin is made of brittle material to ensure brittle breaking at maximum shear force and release the limit.
It solves the problems of decoupling risks in the early stage of lifting and the natural swing of hooks, simplifies hook operation, improves lifting efficiency, and ensures the safety of crane lifting operations.
Smart Images
Figure CN223032851U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of hooks, and particularly relates to a hook with a limit pin. Background Art
[0002] The hook with a limit pin can, after the lifting is completed, quickly slide off the goods hooked by the hook through the lever principle, with simple operation and convenient use. The defects of this technology are as follows: When the hook with a limit pin is used on a crane, since the crane hook is heavy, in the state of not lifting a heavy object, the hook counterweight is at the lower part and the hook is at the upper part. When lifting a heavy object, the hook needs to be adjusted to be upright before hoisting; during the multi-point lifting process, since multiple hooks are used, it is more difficult for manual hook operation and the efficiency is low; at the initial stage of hoisting, that is, during the process of the hook and the object to be hoisted being lifted, there is a risk of unhooking due to the weight of the hook counterweight; the hook swings randomly in the natural state, posing a safety hazard. Content of the Utility Model
[0003] The purpose of the utility model is to provide a hook with a limit pin, which can effectively solve the difficulty of manually operating a single or multiple hooks to lift heavy objects, prevent the risk of unhooking at the initial stage of hoisting, and at the same time solve the problem of limiting and preventing swinging of the hook in the natural state.
[0004] The utility model is achieved by the following measures: A hook with a limit pin, characterized in that it includes a connecting rod and a hook body rotatably arranged on the connecting rod;
[0005] On one side of the hook body and located on the rotation axis is a hook, and on the other side is a counterweight. The hook and the connecting rod are connected by a limit pin;
[0006] When the limit pin connects the hook and the connecting rod, the hook body is in an inclined state and the counterweight is located above the hook; at this time, the hook is in a state of waiting to be suspended, and the opening of the hook faces upward, facilitating the suspension of heavy objects.
[0007] When the hook suspends a heavy object and the heavy object is about to leave the ground or has left the ground, the limit pin breaks and the hook body is in a vertical state; at this time, the hook is in a suspended state and the opening of the hook faces upward.
[0008] When the hook does not suspend a heavy object or the weight of the heavy object does not act on the hook, and at the same time the limit pin does not connect the hook and the connecting rod, the hook body is in an inclined state and the counterweight is located below the hook. At this time, the hook is in a state of unhooking, and the opening of the hook faces downward.
[0009] Furthermore, the limit pin is made of a brittle material.
[0010] Further, the brittle material is brick, stone or concrete.
[0011] Further, when the hook body is in a vertical state, the lower part of the connecting piece plugs or completely plugs the opening of the hook.
[0012] Further, when the hook hangs a heavy object and the heavy object is about to leave the ground or has left the ground, the shearing force received by the limit pin is greater than the maximum shearing force that the limit pin can withstand.
[0013] Further, a hanging hole is provided on the connecting rod, and the center of the hanging hole and the axis of the rotating shaft are in the same vertical plane.
[0014] Further, an anti - detachment rod is arranged on the rotating shaft through threaded connection, and the anti - detachment rod can plug the opening of the hook. A threaded blind hole is concentrically arranged on the rotating shaft, and one end of the anti - detachment rod is fixedly provided with a screw rod that cooperates with the threaded blind hole.
[0015] Usage method:
[0016] Installation of the limit pin: Place the crane hook flat on the sleeper. With the assistance of the sleeper, coordinate the rotation of the hook so that the limit holes on the connecting rod and the hook coincide, and insert the limit pin.
[0017] Release of the limit for lifting heavy objects: Hang the heavy object on the hook. When the heavy object has not left the ground, the limit pin bears the total load of the hook and the counterweight. Start the crane to lift the heavy object. During the process when the heavy object is about to leave the ground or has left the ground, as the load borne by the limit pin gradually increases, when the limit pin reaches the maximum shearing force, it breaks brittlely and the limiting function is released. The hook is in a vertical state under the action of the heavy object.
[0018] Automatic unhooking through the lever principle: When the heavy object is lifted to the designated location and falls to the ground, the counterweight rotates the hook through the lever principle, and the lifting point of the heavy object quickly slides off the hook to complete automatic unhooking.
[0019] The beneficial effects brought by the technical solution provided by the embodiment of the present utility model are as follows: Before the hoisting operation of cranes of various tonnages, the hook is horizontally placed on the ground for hook limiting, which is convenient to operate; it solves the problem of easy unhooking in the initial stage of hoisting; during the hoisting operation of the crane, the brittle material pin releases the limit, enabling the hook counterweight to complete the transformation of the force system; using the hook with a limit pin makes it more convenient and faster to lift heavy objects with multiple lifting points and multiple hooks simultaneously. Description of the drawings
[0020] To more clearly illustrate the technical solution of the present utility model, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings listed below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.
[0021] Figure 1 It is a schematic structural diagram of the limit pin in the limit state in the embodiment of the present utility model;
[0022] Figure 2 It is a schematic structural diagram of the decoupling state in the embodiment of the present utility model;
[0023] Figure 3 It is a schematic structural diagram of the anti - detachment rod blocking the hook opening in the embodiment of the present utility model;
[0024] Figure 4 It is a schematic structural diagram of the anti - detachment rod in the embodiment of the present utility model.
[0025] In the accompanying drawings, the list of components represented by each label is as follows: 1. Hook; 2. Counterweight; 3. Rotating shaft; 4. Connecting rod; 5. Limit pin; 6. Hanging hole; 7. Anti - detachment rod; 8. Screw; 9. Threaded blind hole. Detailed implementation manners
[0026] In order to make the purpose, technical solution and advantages of the present utility model more clear, the present utility model will be further described in detail below in conjunction with embodiments. Of course, the specific embodiments described here are only used to explain the present utility model and are not used to limit the present utility model.
[0027] See Figure 1 - Figure 2 , a hook with a limit pin, which is characterized in that it includes a connecting rod 4 and a hook body rotatably arranged on the connecting rod 4;
[0028] On the hook body and on one side of the rotating shaft 3 is the hook 1, and on the other side is the counterweight 2. The hook 1 and the connecting rod 4 are connected by a limit pin 5;
[0029] When the limit pin 5 connects the hook 1 and the connecting rod 4, the hook body is in an inclined state and the counterweight 2 is located above the hook 1; at this time, the hook 1 is in a state of waiting to be hung, and the opening of the hook 1 faces upward, which is convenient for hanging heavy objects.
[0030] When the hook 1 hangs a heavy object and the heavy object is about to leave the ground or has left the ground, the limit pin 5 breaks and the hook body is in a vertical state; at this time, the hook 1 is in a hanging state and the opening of the hook 1 faces upward.
[0031] When the hook 1 is not hanging a heavy object or the weight of the heavy object does not act on the hook 1, and at the same time the limit pin 5 does not connect the hook 1 and the connecting rod 4, the hook body is in an inclined state and the counterweight 2 is located below the hook 1. At this time, the hook 1 is in a decoupled state and the opening of the hook 1 faces downward.
[0032] The limit pin 5 is made of a brittle material.
[0033] The brittle material is brick or stone or concrete. The distance between the limit hole of the limit pin 5 and the rotating shaft 3 is L, the horizontal angle formed by the connection line of the limit holes is α, the diameter of the limit hole is D, and the limit pin 5 is generally a cylinder. Then the calculation formula of the shear stress τ of the cylindrical brittle material pin can be obtained through the following formula:
[0034] τ = F / A (obtained by transforming through F = τ×A)
[0035] Among them, F represents the magnitude of the shear force of the cylindrical pin, τ represents the magnitude of the shear stress of the cylindrical pin, and A represents the magnitude of the stress area of the cylindrical pin. In the calculation, it is necessary to first determine the magnitude of the maximum shear force F received by the cylindrical pin, and then calculate the magnitude of the shear stress τ received according to the magnitude of the stress area A, and prepare brittle material pins such as plain concrete with corresponding strength grades.
[0036] When the hook body is in a vertical state, the lower part of the connecting piece plugs or completely plugs the opening of the hook 1.
[0037] When the hook 1 hangs a heavy object and the heavy object is about to leave the ground or has left the ground, the shear force received by the limit pin 5 is greater than the maximum shear force that the limit pin 5 can bear.
[0038] A lifting hole 6 is provided on the connecting rod 4, and the center of the lifting hole 6 and the axis of the rotating shaft 3 are in the same vertical plane.
[0039] An anti - detachment rod 7 is threadedly connected to the rotating shaft 3, and the anti - detachment rod 7 can plug the opening of the hook 1. A threaded blind hole 9 is concentrically provided on the rotating shaft 3, and one end of the anti - detachment rod 7 is fixedly provided with a screw rod 8 that cooperates with the threaded blind hole 9.
[0040] Usage method:
[0041] Installation of the limit pin 5: Place the crane hook 1 flat on the cushion wood. With the assistance of the cushion wood, coordinate the rotation of the hook 1 so that the limit holes on the connecting rod 4 and the hook 1 coincide, and insert the limit pin 5;
[0042] Lifting weight limit release: Hang the weight on hook 1. When the weight has not left the ground, the limit pin 5 bears the total load of hook 1 and counterweight 2. Start the crane to lift the weight. During the process when the weight is about to leave the ground or has left the ground, as the load borne by the limit pin 5 gradually increases, when the limit pin 5 reaches the maximum shear force, it will break brittlely, and the limiting function is released. The hook is in a vertical state under the action of the weight.
[0043] Automatic unhooking through the lever principle: When the weight is lifted to the designated location and lands on the ground, the counterweight 2 causes the hook to rotate through the lever principle, and the weight hanging point quickly slides off hook 1 to complete automatic unhooking.
[0044] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A hook with a limit pin, characterized in that: It comprises a connecting rod and a hook body rotatably arranged on the connecting rod; The hook body has a hook on one side of the rotating shaft and a counterweight on the other side, and the hook and the connecting rod are connected by a limit pin; When the limit pin is connected to the hook and the connecting rod, the hook body is in an inclined state and the counterweight is located above the hook; When a heavy object is hung on the hook and the heavy object is about to leave the ground or is off the ground, the limit pin breaks and the hook body is in a vertical state; When the hook does not hang a heavy object or the weight of the heavy object does not act on the hook, and the limit pin is not connected to the hook and the connecting rod, the hook body is in an inclined state and the counterweight is located below the hook.
2. The hook with a limit pin according to claim 1, characterized in that: The limiting pin is made of brittle material.
3. The hook with a limit pin according to claim 2, characterized in that: The brittle material is brick, stone or concrete.
4. The hook with a limit pin according to claim 1, characterized in that: The connecting rod is provided with a hanging hole, and the center of the hanging hole and the axis of the rotating shaft are in the same vertical plane.
5. The hook with a limit pin according to claim 1, characterized in that: An anti-drop rod is provided on the rotating shaft through a threaded connection, and the anti-drop rod can block the opening of the hook.