Electric hoist limiting device
By introducing a limit mechanism and a microcontroller into the electric hoist, the hoist automatically stops lifting after the goods reach the desired height, solving the problem of hook collision caused by obstructed vision and ensuring the safety and integrity of the electric hoist.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-29
- Publication Date
- 2026-03-03
AI Technical Summary
When existing electric hoists are in operation, the hook may collide with the lifting roller due to obstructed vision, causing damage to the electric hoist.
An electric hoist limit device was designed, including a limit mechanism and a microcontroller. Through the cooperation of limit switches and dampers, the hoist automatically stops lifting when the goods reach a certain height, preventing the hook from continuing to rise.
This effectively avoids collisions between the hook and the lifting roller caused by obstructed vision, protecting the safety and integrity of the electric hoist.
Smart Images
Figure CN223963178U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cargo lifting technology, specifically to an electric hoist limiting device. Background Technology
[0002] Cranes are commonly used for lifting goods, and electric hoists are an important component of cranes. Most of the work of a crane is accomplished by electric hoists, which are easy to operate and highly safe.
[0003] When existing electric hoists are in operation, the worker usually hooks the goods onto the hook, and then the motor retracts the cable through the lifting roller to lift the goods through the hook. After the goods are transported to the appropriate position, they are lowered down through the cable and hook.
[0004] Existing electric hoists have the following problems: when the goods reach a certain height, workers may continue to raise the hook due to obstructed vision, eventually causing the hook to collide with the lifting roller, resulting in damage to the electric hoist. To address this, we propose an electric hoist limiting device. Utility Model Content
[0005] The technical problem to be solved by this utility model is to overcome the existing defects and provide an electric hoist limiting device. When the goods reach a certain height, the electric hoist stops working through the limiting mechanism, which avoids the situation where the electric hoist is damaged because the operator's line of sight is obstructed when the hook continues to rise. This can effectively solve the problems in the background art.
[0006] To achieve the above objectives, the present invention provides the following technical solution: an electric hoist limiting device, including a lifting frame, a rotating rod rotatably connected inside the lifting frame, lifting rollers fixedly sleeved on both the left and right sides of the outer surface of the rotating rod, and a limiting mechanism;
[0007] Limiting mechanism: It includes a lead screw, a sliding seat, a slide rail, a support rod, a damper, a rubber pad, and a limit switch. The lead screw is rotatably connected inside the lifting frame, and the sliding seat is threadedly connected to the outer surface of the lead screw. The top wall of the lifting frame is provided with a slide rail, and the upper end of the sliding seat is slidably connected to the inside of the slide rail. The front side of the sliding seat is provided with a support rod, and a damper is provided in the mounting hole at the upper end of the support rod. A rubber pad is provided on the right side of the buffer end of the damper. A limit switch is fixedly connected to the top wall of the lifting frame, and the contact of the limit switch faces to the left. When the goods reach a certain height, the limiting mechanism stops the electric hoist from working, preventing the electric hoist from being damaged by the operator continuing to raise the hook due to the obstruction of their line of sight.
[0008] Furthermore, it also includes a microcontroller, which is located outside the lifting frame. The input terminal of the microcontroller is electrically connected to an external power source, and the limit switch is bidirectionally electrically connected to the microcontroller to facilitate the control of the normal operation of the electric hoist.
[0009] Furthermore, the limiting mechanism also includes gear one and gear two. Gear one is fixedly sleeved on the right end of the outer surface of the lead screw, and gear two is fixedly sleeved on the right end of the outer surface of the rotating rod. Gear one and gear two are meshed and connected to facilitate the normal operation of the limiting mechanism.
[0010] Furthermore, a motor is provided on the right side of the lifting frame. The left end of the output shaft of the motor is fixedly connected to the right end of the rotating rod, and the input end of the motor is electrically connected to the output end of the microcontroller to provide driving force.
[0011] Furthermore, it also includes a hook. The upper and lower walls of the opening on the front side of the lifting frame are provided with grooves. Two wire seats are slidably connected between the two grooves. The outer surface of the wire seats is provided with slots. The upper surface of the hook is rotatably connected to the left and right sides with wheels. The outer surface of the lifting roller is provided with cables. The front end of the cables passes through the inside of the slot on the same side and the bottom of the wheel and is fixedly connected to the rear side of the outer surface of the lifting frame, which facilitates the lifting and lowering of goods.
[0012] Furthermore, the upper surface of the lifting frame is provided with fixed seats on both the front and rear sides. The side of the fixed seat closest to the center of the lifting frame is rotatably connected to a rotating shaft one. The outer surface of the rotating shaft one is rotatably connected to a roller through a bearing. The side of the fixed seat closest to the center of the lifting frame is rotatably connected to a rotating wheel through symmetrically distributed rotating shaft two, which facilitates the movement of the electric hoist.
[0013] Furthermore, a second motor is provided on the front side of the fixed base. The rear end of the output shaft of the second motor is fixedly connected to the front end of the first rotating shaft on the front side. The input end of the second motor is electrically connected to the output end of the microcontroller to provide driving force.
[0014] Furthermore, a gear three is fixedly fitted on the outer surface of the front rotating shaft one, and a gear four is fixedly fitted on the outer surface of the front rotating shaft two. Both gear fours mesh with a gear three, which facilitates driving the electric hoist to move.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This electric hoist limiting device has the following advantages:
[0016] The rotation of the rotating rod drives gear one to rotate, and the rotation of gear one drives the lead screw to rotate through gear two. The rotation of the lead screw drives the sliding seat to move to the right, causing the support rod to drive the damper to move to the right. When the goods reach a certain height, the buffer end of the damper contacts the contact of the limit switch through the rubber pad. After the contact of the limit switch is impacted, it transmits a signal to the microcontroller. Then the microcontroller shuts off motor one, stopping the goods and preventing the electric hoist from being damaged by the operator continuing to raise the hook due to the obstruction of their line of sight. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model;
[0018] Figure 2 This is a cross-sectional structural diagram of the present invention;
[0019] Figure 3 This is an enlarged structural diagram of point A of this utility model.
[0020] In the diagram: 1. Lifting frame, 2. Microcontroller, 3. Limiting mechanism, 301. Lead screw, 302. Sliding seat, 303. Slide rail, 304. Support rod, 305. Damper, 306. Rubber pad, 307. Limit switch, 308. Gear 1, 309. Gear 2, 4. Motor 1, 5. Lifting roller, 6. Cable, 7. Hook, 8. Rotary wheel, 9. Slide groove, 10. Wire seat, 11. Slot, 12. Motor 2, 13. Rotary shaft 1, 14. Gear 3, 15. Rotary shaft 2, 16. Gear 4, 17. Roller, 18. Rotating wheel, 19. Fixed seat. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] Please see Figure 1-3This embodiment provides a technical solution: an electric hoist limiting device, including a lifting frame 1, a rotating rod rotatably connected inside the lifting frame 1, lifting rollers 5 fixedly sleeved on both the left and right sides of the outer surface of the rotating rod, a limiting mechanism 3, and a microcontroller 2. The microcontroller 2 is disposed outside the lifting frame 1, its input terminal is electrically connected to an external power source, a limit switch 307 is bidirectionally electrically connected to the microcontroller 2, and a hook 7 is also included. Sliding grooves 9 are provided on the upper and lower walls of the opening on the front side of the lifting frame 1, and two wire seats 10 are slidably connected between the two sliding grooves 9. The outer surface of each of the lifting frames 1 is provided with slots 11. Rotary wheels 8 are rotatably connected to the left and right sides of the upper surface of the hook 7. Cables 6 are provided on the outer surface of each lifting roller 5. The front ends of the cables 6 pass through the inside of the slots 11 on the same side and below the rotary wheels 8, and are fixedly connected to the rear side of the outer surface of the lifting frame 1. Fixed seats 19 are provided on both the front and rear sides of the upper surface of the lifting frame 1. A rotating shaft 13 is rotatably connected to the side of the fixed seat 19 closest to the center of the lifting frame 1. Rollers 17 are rotatably connected to the outer surface of the rotating shaft 13 via bearings. Rotating shafts 15 are symmetrically distributed on the side of the fixed seat 19 closest to the center of the lifting frame 1. A rotating wheel 18 is rotatably connected. A motor 2 12 is mounted on the front side of a fixed base 19. The rear end of the output shaft of motor 2 12 is fixedly connected to the front end of a rotating shaft 13. The input end of motor 2 12 is electrically connected to the output end of a microcontroller 2. A gear 3 14 is fixedly fitted onto the outer surface of the rotating shaft 13. Gears 4 16 are fixedly fitted onto the outer surface of the rotating shaft 2 15. Both gears 4 16 mesh with one gear 3 14. When the operator operates the microcontroller 2 to open motor 1 4, the output shaft of motor 1 4 drives the lifting roller 5 to rotate via a rotating rod, thereby lifting the cable 6. Cable 6 is released through wire seat 10. At the same time as cable 6 is released, the hook 7 moves downward through the rotating wheel 8. When the hook 7 moves to the appropriate position, the goods are hung on the hook 7. Then, the cable 6 is retracted through motor 4 and lifting roller 5, causing the goods to move upward. Then, motor 2 12 is turned on. The output shaft of motor 2 12 drives the front rotating shaft 13 to rotate. The rotation of the front rotating shaft 13 drives the gear 3 14 to rotate. The rotation of gear 3 14 drives the rotating shaft 2 15 to rotate through the meshing gear 4 16, thereby causing the rotating wheel 18 to rotate. Under the restriction of roller 17, the electric hoist moves.
[0023] Limiting mechanism 3 includes a lead screw 301, a sliding seat 302, a slide rail 303, a support rod 304, a damper 305, a rubber pad 306, and a limit switch 307. The lead screw 301 is rotatably connected inside the lifting frame 1, and the sliding seat 302 is threaded onto the outer surface of the lead screw 301. The top wall of the lifting frame 1 is provided with a slide rail 303, and the upper end of the sliding seat 302 is slidably connected to the interior of the slide rail 303. A support rod 304 is provided on the front side of the sliding seat 302, and a damper 305 is provided in the mounting hole at the upper end of the support rod 304. A rubber pad 306 is provided on the right side of the buffer end of the damper 305. A limit switch 307 is fixedly connected to the top wall of the lifting frame 1, with the contact of the limit switch 307 facing left. The limiting mechanism 3 also includes a first gear 308 and a second gear 309. The first gear 308 is fixedly sleeved on the right end of the outer surface of the lead screw 301, and the outer surface of the rotating rod... Gear 2 309 is fixedly sleeved on the right end of the lifting frame 1. Gear 1 308 meshes with gear 2 309. Motor 1 4 is installed on the right side of the lifting frame 1. The left end of the output shaft of motor 1 4 is fixedly connected to the right end of the rotating rod. The input end of motor 1 4 is electrically connected to the output end of microcontroller 2. At the same time, the rotation of the rotating rod drives gear 1 308 to rotate. The rotation of gear 1 308 drives the lead screw 301 to rotate through the meshing gear 2 309. The rotation of lead screw 301 drives the threaded sliding seat 302 to move to the right along the slide rail 303, causing the support rod 304 to drive the damper 305 to move to the right. When the goods reach a certain height, the buffer end of the damper 305 contacts the contact of the limit switch 307 through the rubber pad 306. After the contact of the limit switch 307 is impacted, it transmits a signal to microcontroller 2. Then microcontroller 2 shuts off motor 1 4, stopping the goods.
[0024] The working principle of the electric hoist limit device provided by this utility model is as follows: The operator operates the microcontroller 2 to turn on the motor 4. The output shaft of the motor 4 drives the lifting roller 5 to rotate through the rotating rod, thereby releasing the cable 6 through the wire seat 10. At the same time as the cable 6 is released, the hook 7 moves downward through the rotating wheel 8. When the hook 7 moves to the appropriate position, the goods are hung on the hook 7. Then, the cable 6 is retracted through the motor 4 and the lifting roller 5, causing the goods to move upward. At the same time, the rotation of the rotating rod drives the gear 308 to rotate. The rotation of the gear 308 drives the lead screw 301 to rotate through the meshing gear 309. The rotation of the lead screw 301 drives the threaded sliding seat 302 to rotate along the... The slide rail 303 moves to the right, causing the support rod 304 to drive the damper 305 to move to the right. When the goods reach a certain height, the buffer end of the damper 305 contacts the contact of the limit switch 307 through the rubber pad 306. After the contact of the limit switch 307 is impacted, it transmits a signal to the microcontroller 2. Then the microcontroller 2 shuts off motor 14, stopping the goods, and then turns on motor 2. The output shaft of motor 2 12 drives the front rotating shaft 13 to rotate. The rotation of the front rotating shaft 13 drives the gear 3 14 to rotate. The rotation of gear 3 14 drives the rotating shaft 2 15 to rotate through the meshing gear 4 16, thereby causing the rotating wheel 18 to rotate. Under the restriction of the roller 17, the electric hoist moves.
[0025] It is worth noting that the microcontroller 2 disclosed in the above embodiments can be an EFR32MG21, the limit switch 307 can be a YN-8 series, and the motor 4 and motor 12 can be Y180L-615. The microcontroller 2 controls the operation of the limit switch 307, motor 4 and motor 12 using methods commonly used in the prior art.
[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. An electric hoist limiting device, comprising a lifting frame (1), a rotating rod is rotatably connected inside the lifting frame (1), lifting rollers (5) are fixedly sleeved on the outer surface of the rotating rod on both left and right sides, characterized in that: It also includes a limiting mechanism (3); The limiting mechanism (3) comprises a lead screw (301), a sliding seat (302), a sliding rail (303), a support rod (304), a damper (305), a rubber pad (306) and a travel switch (307), the inside of the lifting frame (1) is rotationally connected with the lead screw (301), the outer surface of the lead screw (301) is threadedly connected with the sliding seat (302), the top wall of the lifting frame (1) is provided with the sliding rail (303), the upper end of the sliding seat (302) is slidingly connected to the inside of the sliding rail (303), the front side of the sliding seat (302) is provided with the support rod (304), the mounting hole in the upper end of the support rod (304) is provided with the damper (305), the right side of the buffer end of the damper (305) is provided with the rubber pad (306), the top wall of the lifting frame (1) is fixedly connected with the travel switch (307), and the contact of the travel switch (307) faces the left side.
2. A kind of electric hoist limiting device according to claim 1, wherein: It also includes a single-chip microcomputer (2), which is arranged outside the lifting frame (1), the input end of the single-chip microcomputer (2) is electrically connected with an external power supply, and the travel switch (307) is bidirectionally electrically connected with the single-chip microcomputer (2).
3. A device according to claim 2, c h a r a c t e r i s e d in that: The limiting mechanism (3) further comprises a gear one (308) and a gear two (309), the outer surface of the right end of the lead screw (301) is fixedly sleeved with the gear one (308), and the outer surface of the right end of the rotating rod is fixedly sleeved with the gear two (309); the gear one (308) is in meshing connection with the gear two (309).
4. A device according to claim 3, c h a r a c t e r i s e d in that: The right side of the lifting frame (1) is provided with a motor one (4), the left end of the output shaft of the motor one (4) is fixedly connected with the right end of the rotating rod, and the input end of the motor one (4) is electrically connected with the output end of the single-chip microcomputer (2).
5. A device according to claim 3, c h a r a c t e r i s e d in that: It also includes a lifting hook (7), the upper and lower walls of the opening of the front side of the lifting frame (1) are both provided with a sliding groove (9), two wire holders (10) are slidingly connected between the two sliding grooves (9), the outer surfaces of the wire holders (10) are both provided with a notch (11), the upper surfaces of the lifting hook (7) are both rotatably connected with a rotating wheel (8), the outer surfaces of the lifting rollers (5) are both provided with a cable (6), and the front ends of the cables (6) are all fixedly connected with the outer surface of the lifting frame (1) at the rear side by penetrating through the inside of the same side notch (11) and below the rotating wheel (8).
6. A device according to claim 2, c h a r a c t e r i s e d in that: The front and rear sides of the upper surface of the lifting frame (1) are both provided with a fixed seat (19), the side close to the center of the lifting frame (1) of the fixed seat (19) is rotatably connected with a rotating shaft one (13), the outer surface of the rotating shaft one (13) is rotatably connected with a roller (17) through a bearing, and the side close to the center of the lifting frame (1) of the fixed seat (19) is rotatably connected with a rotating wheel (18) through a rotating shaft two (15) which is symmetrically distributed.
7. A device according to claim 6, c h a r a c t e r i s e d in that: The front side of the front fixed seat (19) is provided with a motor two (12), the rear end of the output shaft of the motor two (12) is fixedly connected with the front end of the rotating shaft one (13) of the front side, and the input end of the motor two (12) is electrically connected with the output end of the single-chip microcomputer (2).
8. A device according to claim 6, c h a r a c t e r i s e d in that: The outer surface of the front pivot one (13) is fixedly sleeved with a gear three (14), and the outer surface of the front pivot two (15) is fixedly sleeved with a gear four (16), and the two gear fours (16) are in meshing connection with the gear three (14).