Safety lifting hook for crane
By integrating components such as buzzer alarm, ultrasonic sensor detection, and worm gear structure into the crane hook, the problems of hook rotation and overload safety hazards are solved, and the stability and safety of the lifting process are improved.
Patent Information
- Application Number
- CN202422999842.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-05
AI Technical Summary
The hook is prone to rotation when lifting heavy objects, which can lead to collisions and safety hazards. It also poses a greater safety risk when overloaded, especially when lifting high-temperature or corrosive items.
A safety hook for cranes has been designed, including components such as a lifting box, hook, buzzer, ultrasonic sensor, and anti-detachment device. The buzzer alarms when overloaded, the ultrasonic sensor detects obstacles, the anti-detachment device prevents the hook from coming off, the hook and worm gear structure prevents rotation, and the support rod guides the lifting rope, thereby improving the stability of lifting.
It effectively prevents the hook from rotating, reduces the risk of collisions, improves lifting safety, prevents hook detachment, provides timely overload alarms, avoids safety accidents, and enhances the stability and safety of the lifting process.
Smart Images
Figure CN223495970U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of crane accessories technology, specifically to a safety hook for cranes. Background Technology
[0002] A crane is a multi-action lifting machine that vertically lifts and horizontally moves heavy objects within a certain range. Also known as an overhead crane, gantry crane, or hoist, the crane hook assembly is a major component of the lifting system. A crane hook assembly generally includes a hook support, a hook, and a pulley system mounted on the upper end of the hook support. The pulley system is connected to the crane's lifting drum via a wire rope. The drum lifts the heavy object by winding the wire rope around the hook. However, since hooks are mostly fixed to the hook support with nuts, over time, the hook may rotate during lifting, which can easily cause collisions and unnecessary losses. This poses a significant safety hazard, especially when lifting high-temperature or corrosive materials.
[0003] In addition, some companies use small-tonnage cranes to lift heavy objects in order to reduce costs. Overloading the hook increases the risk factor and can also cause the lifting rope to break, leading to safety accidents. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a safety hook for cranes, which can effectively prevent the hook from rotating during lifting and trigger a buzzer alarm when the lifting weight is mismatched, thereby improving lifting safety.
[0005] This utility model is achieved through the following technical solution:
[0006] A safety hook for a crane is provided, comprising a lifting box and a hook mounted on the bottom of the lifting box via a hanger. A sheave is movably connected inside the lifting box via a pivot, and a rope is wound on the sheave. The hanger includes two parallel and spaced-apart yokes, with the hook mounted between the two yokes via a crossbeam. A buzzer is connected to the top of the lifting box. A limiting groove is provided in the middle of the lifting box, and a lifting rod is movably connected within the limiting groove. Rotary drums are rotatably fitted at both ends of the lifting rod. The middle section of the rope passes through the top of the rotating drum, and the section of the rope in contact with the rotating drum forms a downward-opening V-shape. A fixed cylinder is connected to the middle of the bottom surface of the lifting rod, and a component is fixedly connected to the top wall of the fixed cylinder. Two conductive plates are electrically connected to the two ends of the power supply circuit of the buzzer. An outer sleeve is connected to the bottom wall of the inner wall of the box and is slidably fitted with the fixed cylinder. A fixed spring is connected between the bottom surface of the fixed cylinder and the bottom surface of the outer sleeve. A conductive rod that can contact the conductive plates to conduct the circuit is connected to the bottom surface of the outer sleeve. A through hole is provided in the center of the crossbeam. A positioning cylinder is rotatably installed on the upper surface of the crossbeam through the through hole via a thrust bearing. The upper end of the hook passes through the through hole and the thrust bearing in sequence and is threadedly connected to the positioning cylinder. A worm gear is fitted on the hook below the crossbeam. A worm gear that meshes with the worm gear is rotatably installed on one of the yoke plates via a support.
[0007] Furthermore, the top of the positioning cylinder is connected to an anti-loosening plate that abuts against the upper end face of the hook. The anti-loosening plate has an anti-loosening through hole, and the upper end face of the hook has a screw hole facing the anti-loosening hole. An anti-loosening screw is threaded into the screw hole and the anti-loosening through hole.
[0008] An anti-loosening plate is installed at the top of the positioning cylinder. The anti-loosening through hole on the anti-loosening plate is connected to the screw hole on the upper end face of the hook by an anti-loosening screw thread, which can play a role in preventing the positioning cylinder from loosening and improving the stability of the hook installation.
[0009] Furthermore, support blocks are fixed at the same positions on both sides of the hoisting box. Each support block is connected to a telescopic rod that serves as a guide. The telescopic rod includes a vertically arranged outer support tube and an inner support tube that is slidably arranged inside the outer support tube. The upper end of the inner support tube is connected to the crane trolley, and the lower end of the outer support tube is connected to the support block.
[0010] Support blocks are installed on both sides of the hoisting box, and telescopic rods with guiding function are connected to the support blocks. The outer support tube and inner support tube of the telescopic rod have a certain rigidity and can be used to guide the movement of the hoisting rope during hoisting, effectively preventing the hook from swaying during hoisting and effectively improving the safety of hook hoisting.
[0011] Furthermore, an anti-detachment component is installed at the hook opening of the hook. The anti-detachment component includes an anti-detachment groove on the inner wall of the hook on one side of the hook opening and a positioning groove on the inner wall of the hook on the other side of the hook opening. A rotating block is connected to the anti-detachment groove through a rotating shaft. A return spring is connected between the rotating block and the anti-detachment groove. An arc-shaped baffle that can close the hook opening is connected to the bottom of the rotating block. A positioning block that matches the shape of the positioning groove and can be inserted into the positioning groove for limiting the position is connected to the end of the arc-shaped baffle.
[0012] The hook is equipped with an anti-detachment device at the hook opening. The baffle of the anti-detachment device is connected to the positioning groove on one side of the hook through the positioning block at the end to seal the hook opening, effectively preventing the hook from detaching during the lifting process. When hooking the hook, the baffle can be naturally squeezed to open the hook opening for lifting. After entering the hook, the elastic force of the return spring drives the baffle to automatically close the hook opening, improving the safety of use.
[0013] Furthermore, ultrasonic sensors are installed on the four sides of the crane, and a signal transmitter with its own power supply is installed inside the crane. The ultrasonic sensors are electrically connected to the signal transmitter, and the crane controller is electrically connected to a signal receiver that can wirelessly communicate with the signal transmitter through a signal processor.
[0014] Four ultrasonic sensors are installed in four directions on the hook to detect the hook's movement in all four directions and to detect obstacles within a set range. Signals are transmitted to the crane's controller via a signal transmitter and receiver to stop the crane when an obstacle is detected, thus improving the safety of the hook's operation.
[0015] The beneficial effects of this utility model are:
[0016] This invention features a buzzer installed on the hoisting box. When the lifting operation is overloaded, the increased tension of the rope will press down on the lifting rod, causing the conductive plate in the middle of its bottom surface to move down and connect with the conductor rod below to conduct the buzzer circuit, thus emitting a buzzer alarm to remind the operator that the lifting is overloaded and improve the safety of the lifting operation.
[0017] A worm gear is fitted onto the hook below the crossbeam. A worm is rotatably mounted on one side of the yoke plate, meshing with the worm gear. The worm can drive the worm gear to rotate the hook. The angle of the hook can be adjusted before hoisting to facilitate hooking and hoisting of the object. At the same time, the worm gear and worm have self-locking properties, which can achieve angle self-locking after angle adjustment, effectively preventing the hook from rotating during hoisting and improving hoisting safety.
[0018] The two sides of the hoisting box are connected to telescopic rods that serve as guides. The sliding cooperation between the outer and inner support sleeves can guide and limit the lifting of the hoisting rope, effectively preventing the hook below from swaying and further improving the stability and safety of the hoisting. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0020] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.
[0021] Figure 3 This is a schematic diagram of the connection structure between the lifting rod and the hoisting box from another perspective in this utility model.
[0022] Figure 4 for Figure 1 Enlarged diagram of point B in the middle.
[0023] As shown in the figure:
[0024] 1. Hoisting box, 2. Yoke plate, 3. Hook, 4. Support block, 5. Limiting groove, 6. Outer support tube, 7. Inner support tube, 8. Rope, 9. Hanging wheel, 10. Buzzer, 11. Crossbeam, 12. Fixed cylinder, 13. Thrust bearing, 14. Worm gear, 15. Worm, 16. Anti-loosening screw, 17. Lifting rod, 18. Rotary cylinder, 19. Fixed cylinder, 20. Conductive sheet, 21. Fixed spring, 22. Outer sleeve, 23. Conductive rod, 24. Anti-detachment groove, 25. Rotating block, 26. Arc-shaped baffle, 27. Positioning block, 28. Positioning groove, 29. Return spring. Detailed Implementation
[0025] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.
[0026] A safety hook for a crane includes a lifting box 1 and a hook 3 installed at the bottom of the lifting box 1 via a hanger. A wheel 9 is movably connected inside the lifting box 1 via a pivot, and a rope 8 is wound on the wheel 9. The hanger includes two parallel and spaced-apart yokes 2, and the hook is installed between the two yokes 2 via a crossbeam 11.
[0027] A buzzer 10 is connected to the top of the lifting box 1. The buzzer 10 is mounted on the lifting box 1 via a mounting bracket, which contains a battery for powering the buzzer 10. Support blocks 4 are fixed at the same positions on both sides of the lifting box 1. Each support block 4 is connected to a telescopic rod that serves as a guide. The telescopic rod includes a vertically arranged outer support tube 6 and an inner support tube 7 that slides within the outer support tube 6. The upper end of the inner support tube 7 is connected to the crane's trolley, and the lower end of the outer support tube 6 is connected to the support block 4. Ultrasonic sensors are installed on the four sides of the lifting box 1. A signal transmitter with its own power supply is installed inside the lifting box 1. The ultrasonic sensors are electrically connected to the signal transmitter. The crane's controller is electrically connected to a signal receiver that can wirelessly communicate with the signal transmitter via a signal processor.
[0028] The hoisting box 1 has a limiting groove 5 in the middle, and a lifting rod 17 is movably connected in the limiting groove 5. The two ends of the lifting rod 17 are rotatably sleeved with rotating cylinders 18. The middle part of the rope 8 passes through the top of the rotating cylinder 18. The section of the rope 8 that contacts the rotating cylinder 18 forms a V-shape with the opening facing downwards. The bottom surface of the lifting rod 17 is connected to a fixed cylinder 19. The inner top wall of the fixed cylinder 19 is fixedly connected to two conductive plates 20 that are electrically connected to the two ends of the power supply circuit of the buzzer 10. The inner bottom wall of the hoisting box 1 is connected to an outer sleeve 22 that is slidably sleeved with the fixed cylinder 19. The fixed cylinder 19 and the outer sleeve 22 are vertically limited and slidably connected by a slider and a slide rail. A fixing spring 21 is connected between the bottom surface of the fixed cylinder 19 and the bottom surface of the outer sleeve 22. The bottom surface of the outer sleeve 22 is connected to a conductive rod 23 that can contact the conductive plates 20 to conduct the circuit.
[0029] A through hole is provided in the center of the crossbeam 11. A positioning cylinder 12 is rotatably installed on the upper surface of the crossbeam 11 through the through hole via a thrust bearing 13. The upper end of the hook 3 passes through the through hole and the thrust bearing 13 in sequence and is threadedly connected to the positioning cylinder 12. A worm gear 14 is sleeved and installed under the hook below the crossbeam 11. A worm 15 that meshes with the worm gear 14 is rotatably installed on one of the yoke plates 2 via a support. In order to prevent the positioning cylinder 12 from loosening with the hook 3, an anti-loosening plate is connected to the top of the positioning cylinder 12 and abuts against the upper end face of the hook 3. An anti-loosening through hole is opened on the anti-loosening plate. A screw hole is opened on the upper end face of the hook 3 opposite to the anti-loosening hole, and an anti-loosening screw 16 is threadedly connected to the screw hole and the anti-loosening through hole.
[0030] To prevent the hook from coming off during hoisting, the hook 3 is equipped with an anti-detachment component at its hook opening. The anti-detachment component includes an anti-detachment groove 24 on the inner wall of the hook on one side of the hook opening and a positioning groove 28 on the inner wall of the hook on the other side of the hook opening. A rotating block 25 is connected to the anti-detachment groove 24 via a rotating shaft. A return spring 29 is connected between the rotating block 25 and the anti-detachment groove 24. An arc-shaped baffle 26 that can close the hook opening is connected to the bottom of the rotating block 25. A positioning block 27 that matches the shape of the positioning groove 28 and can be inserted into the positioning groove 28 for limiting the position is connected to the end of the arc-shaped baffle 26.
[0031] The working process of this utility model:
[0032] In use, this invention separates the positioning block 27 at the end of the arc-shaped baffle 26 from the positioning groove 28 by pressing the arc-shaped baffle 26 at the hook opening, thus opening the hook opening of the hook 3 for easy hooking with the load. Simultaneously, rotating the worm gear 15 drives the worm wheel 14, which in turn rotates the hook 3 to facilitate hooking. Once hooked, the hook 3 remains fixed at its angle due to the self-locking action of the worm wheel 14 and worm gear 15. The rotation enhances the stability of the hoisting. Under the elastic force of the return spring 29, the arc-shaped baffle 26 is rotated by the rotating block 25, which drives the positioning block 27 at its end to engage with the positioning groove 28 for limiting and locking, thus sealing the hook opening of the hook 3. Because the upper part of the positioning block 27 and the positioning groove 28 are flat, when the arc-shaped baffle 26 is squeezed during hoisting, the positioning block 27 and the positioning groove 28 will be effectively engaged, effectively preventing the arc-shaped baffle 26 from separating from the hook 3 and preventing it from becoming detached.
[0033] When the hoisting object is raised and lowered by the cable 8, the support blocks 4 on both sides of the hoisting box 1 and the trolley on the top of the crane are connected by telescopic rods that act as guides. During the lifting and moving process, the vertically arranged outer support pipe 6 and inner support pipe 7 slide together, which limits and guides the cable 8, effectively reducing the swaying of the cable 8 during the hoisting process and further improving the stability of the hoisting. During the hoisting process, because ultrasonic sensors are installed on all four sides of the hoisting box 1, obstacles within a 2m range in front of it can be monitored. After detecting an obstacle, the signal is transmitted to the crane controller through the cooperation of the signal receiver and signal transmitter. The controller then controls the crane to stop working in time according to the signal to avoid collision accidents.
[0034] When the load exceeds its rated lifting weight, the buzzer 10 installed on the hoisting box 1 will trigger an alarm, prompting the operator to stop the operation in time to avoid a safety accident. The specific workflow is as follows: When the lifted load is overweight, the tension on the rope 8 increases, which increases the downward pressure exerted on the lifting rod 17 by the middle of the rope 8, exceeding the elastic force of the fixed spring 21. This causes the lifting rod 17 to move downward, and the conductive plate 20 in the middle of the bottom surface of the lifting rod 17 moves downward at the same time, making contact with the conductive rod 23 below. This connects the circuit of the buzzer 10, causing the buzzer 10 to emit a buzzing sound to alert the workers to the overweight load and improve the safety of use. After the lifting stops, the pressure on the rope 8 decreases and becomes less than the elastic force of the fixed spring 21 at the bottom of the fixed cylinder 19. Under the thrust of the deformation of the fixed spring 21, the lifting rod 17 is pushed up in the limit groove 5 and returns to its initial position, causing the conductive plate 20 to separate from the conductive rod 23. The circuit of the buzzer 10 is then disconnected, and the buzzer 10 stops working. This enables the detection of overweight loads and improves the safety of use.
[0035] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.
Claims
1. A safety hook for a crane, comprising a lifting box and a hook mounted on the bottom of the lifting box via a lifting bracket, wherein a lifting wheel is movably connected inside the lifting box via a rotating shaft, and a rope is wound on the lifting wheel; the lifting bracket comprises two parallel and spaced-apart yokes, and the hook is mounted between the two yokes via a crossbeam, characterized in that: A buzzer is connected to the top of the hoisting box. A limiting groove is provided in the middle of the hoisting box, and a lifting rod is movably connected in the limiting groove. Rotary drums are rotatably fitted at both ends of the lifting rod. The middle part of the rope passes through the top of the rotating drum, and the section of the rope in contact with the rotating drum forms a downward-opening V shape. A fixed cylinder is connected to the middle of the bottom surface of the lifting rod. Two conductive plates, which are electrically connected to the two ends of the power supply circuit of the buzzer, are fixedly connected to the top wall of the fixed cylinder. An outer sleeve is connected to the bottom wall of the hoisting box and slidably fitted with the fixed cylinder. A fixed spring is connected between the bottom surface of the fixed cylinder and the bottom surface of the outer sleeve. A conductive rod that can contact the conductive plates to conduct the circuit is connected to the bottom surface of the outer sleeve. A through hole is provided in the center of the crossbeam. A positioning cylinder is rotatably installed on the upper surface of the crossbeam through the through hole via a thrust bearing. The upper end of the hook passes through the through hole and the thrust bearing in sequence and is threadedly connected to the positioning cylinder. A worm gear is fitted under the hook below the crossbeam. A worm gear that meshes with the worm gear is rotatably installed on one of the yoke plates via a support.
2. The safety hook for a crane according to claim 1, characterized in that: The top of the positioning cylinder is connected to an anti-loosening plate that abuts against the upper end face of the hook. An anti-loosening through hole is provided on the anti-loosening plate. A screw hole is provided on the upper end face of the hook directly opposite the anti-loosening hole, and an anti-loosening screw is threaded into the screw hole and the anti-loosening through hole.
3. The safety hook for a crane according to claim 1, characterized in that: Support blocks are fixed at the same position on both sides of the hoisting box. Each support block is connected to a telescopic rod that serves as a guide. The telescopic rod includes a vertically arranged outer support tube and an inner support tube that is slidably arranged inside the outer support tube. The upper end of the inner support tube is connected to the crane trolley, and the lower end of the outer support tube is connected to the support block.
4. The safety hook for a crane according to claim 1, characterized in that: The hook is equipped with an anti-detachment component at its hook opening. The anti-detachment component includes an anti-detachment groove on the inner wall of the hook on one side of the hook opening and a positioning groove on the inner wall of the hook on the other side of the hook opening. A rotating block is connected to the anti-detachment groove through a rotating shaft. A return spring is connected between the rotating block and the anti-detachment groove. An arc-shaped baffle that can close the hook opening is connected to the bottom of the rotating block. A positioning block that matches the shape of the positioning groove and can be inserted into the positioning groove for limiting the position is connected to the end of the arc-shaped baffle.
5. The safety hook for a crane according to claim 1, characterized in that: Ultrasonic sensors are installed on the four sides of the crane box. A signal transmitter with its own power supply is installed inside the crane box. The ultrasonic sensors are electrically connected to the signal transmitter. The crane controller is electrically connected to a signal receiver that can wirelessly communicate with the signal transmitter through a signal processor.