Electric hoist position limiting device

Abstract

This utility model discloses a limiting device for an electric hoist, including an electric hoist and a drum installed inside the electric hoist. A wire rope is provided on the surface of the drum. A rope guide is slidably connected to one side of the electric hoist, and a fire-off limit switch is fixedly installed at one end of one side of the electric hoist. Guide rod sleeves are fixedly connected to both ends of the front of the electric hoist, and a guide rod assembly is slidably connected between the two guide rod sleeves. A lubrication mechanism for lubricating the connection between the limiting guide rod and the guide rod sleeve is fixedly installed on the top of each of the two guide rod sleeves. This electric hoist limiting device guides lubricating oil to the connection between the limiting guide rod and the guide rod sleeve, providing lubrication during the movement of the limiting guide rod. This helps reduce friction and wear between the two, extends the service life of the limiting guide rod, minimizes the phenomenon of the limiting guide rod getting stuck, and prevents situations where the fire-off limit switch fails to trigger, thus improving the safety of equipment use.

Description

Technical Field

[0001] This utility model relates to the technical field of electric hoists, specifically to an electric hoist limiting device. Background Technology

[0002] Electric hoists are mainly composed of a motor, reducer, drum, brake, wire rope, and hook. The motor provides power, and the reducer reduces the speed and increases the torque to drive the drum to rotate. The wire rope wound on the drum is connected to the hook to lift and lower the load. Limit devices are usually installed on electric hoists to protect equipment and personnel safety. Among them, the fire-off limit switch is the most common.

[0003] Existing limit switches typically consist of moving and stationary contacts, a push-pull rod (operating rod), a guide rod, and limit blocks. The moving and stationary contacts control the circuit's on / off state, the push-pull rod connects to the guide rod, and the limit blocks are mounted on the guide rod, corresponding to the extreme positions of upward and downward movement, respectively. However, the aforementioned common limit devices for electric hoists still have shortcomings:

[0004] During the triggering process, the guide rod is crucial. The guide rod needs to slide inside the guide rod sleeve to trigger the rise and fall limit switches. However, in some dusty environments, dust particles can easily enter the connection between the guide rod and the guide rod sleeve, which will aggravate the wear of the guide rod and easily cause the guide rod to jam, making the fire cut-off limit switch unusable. Utility Model Content

[0005] The purpose of this utility model is to provide a limit device for an electric hoist, in order to solve the problem mentioned in the background art that the guide rod is crucial in the triggering process. The guide rod needs to slide inside the guide rod sleeve to trigger the upward and downward limit switches. However, in some dusty environments, dust particles can easily enter the connection between the guide rod and the guide rod sleeve, which will aggravate the wear of the guide rod and easily cause the guide rod to jam, making the fire cut-off limit switch unusable.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an electric hoist limiting device, comprising an electric hoist and a drum installed inside the electric hoist, wherein a wire rope is provided on the surface of the drum, a rope guide is slidably connected to one side of the electric hoist, a fire cut-off limiter is fixedly installed at one end of one side of the electric hoist, guide rod sleeves are fixedly connected to both ends of the front of the electric hoist, a guide rod assembly is slidably connected between the two guide rod sleeves, and a lubrication mechanism for lubricating the connection between the limiting guide rod and the guide rod sleeve is fixedly installed on the top of the two guide rod sleeves.

[0007] Preferably, the guide rod assembly includes a limiting guide rod disposed between two guide rod sleeves. One end of the limiting guide rod is rotatably connected to a connecting plate. One side of the connecting plate is fixedly connected to the output end of the flameout limiter by bolts. A locking mechanism is fixedly installed on one side of the connection between the connecting plate and the flameout limiter.

[0008] Preferably, the locking mechanism includes a pin sleeve, a limit pin is slidably connected inside the pin sleeve, a return spring is fixedly connected between the limit pin and the pin sleeve, and one end of the limit guide rod is provided with multiple pin holes, and one end of the limit pin is engaged with the inside of the pin holes.

[0009] Preferably, the surface of the limiting guide rod is provided with two limiting blocks, the top of the limiting blocks is provided with threaded holes, the internal threads of the threaded holes are connected to a limiting screw, and one end of the limiting screw abuts against the surface of the limiting guide rod.

[0010] Preferably, the lubrication mechanism includes two support rods and a support hole plate. One end of each of the two support rods is fixedly connected to one side of the support hole plate. Connecting slide rods are fixedly connected to both sides of the top of the support hole plate. Limiting plates are fixedly connected to one end of each of the two connecting slide rods. An oil inlet head is fixedly connected to the middle of the top of the guide rod sleeve.

[0011] Preferably, an oil supply mechanism is slidably connected between the two connecting slide rods, and a return spring is sleeved on the surface of each of the two connecting slide rods.

[0012] Preferably, the oil supply mechanism includes an oil storage box, with sliding sleeves fixedly connected to both sides of the oil storage box. The interior of the sliding sleeve is slidably connected to the surface of the connecting slide rod. One end of the oil storage box is provided with an oil inlet, and the other end of the oil storage box is fixedly connected to an outlet. A silicone valve head is fixedly installed inside the outlet.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: Firstly, by pressing down on the oil storage box, the oil inlet head connected to the guide rod sleeve passes through the silicone valve head, guiding the internal lubricating oil to the connection between the limit guide rod and the guide rod sleeve. This can lubricate the limit guide rod when it moves, which helps to reduce friction and wear between the two, extend the service life of the limit guide rod, and minimize the phenomenon of the limit guide rod getting stuck. It can also prevent the limit switch from failing to be triggered due to the fire failure, thus improving the safety of equipment use.

[0014] The limit guide rod can rotate, which allows the lubricating oil to be distributed more evenly. At the same time, a locking mechanism for the limit guide rod is set up to prevent it from rotating during use, thus preventing it from affecting the normal operation of the equipment. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the electric hoist limiting device of this utility model;

[0016] Figure 2 A is a partial enlarged view of the structure of the electric hoist limiting device of this utility model;

[0017] Figure 3 This is a partial enlarged view (B) of the structure of the electric hoist limiting device of this utility model;

[0018] Figure 4 This is a structural diagram of the oil storage component of the electric hoist limiting device of this utility model.

[0019] In the diagram: 1. Electric hoist; 2. Flame cut-off limit switch; 3. Wire rope; 4. Rope guide; 5. Guide rod sleeve; 6. Oil inlet head; 7. Support rod; 8. Support orifice plate; 9. Connecting slide rod; 10. Return spring; 11. Limiting plate; 12. Oil reservoir; 13. Sliding sleeve; 14. Liquid outlet; 15. Silicone valve head; 16. Limiting block; 17. Limiting guide rod; 18. Connecting plate; 19. Pin sleeve; 20. Limiting pin; 21. Return spring. Detailed Implementation

[0020] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings of the embodiments of the present invention.

[0021] Please see Figure 1-4 This utility model provides a limiting device for an electric hoist, including an electric hoist 1 and a drum installed inside the electric hoist 1. A wire rope 3 is provided on the surface of the drum. A rope guide 4 is slidably connected to one side of the electric hoist 1. A fire cut-off limiter 2 is fixedly installed at one end of one side of the electric hoist 1. Guide rod sleeves 5 are fixedly connected to both ends of the front of the electric hoist 1. A guide rod assembly is slidably connected between the two guide rod sleeves 5. A lubrication mechanism for lubricating the connection between the limiting guide rod 17 and the guide rod sleeve 5 is fixedly installed on the top of the two guide rod sleeves 5.

[0022] See Figure 1 , Figure 2 and Figure 4 Furthermore, the surface of the limiting guide rod 17 is provided with two limiting blocks 16, and the top of the limiting block 16 is provided with a threaded hole. The threaded hole is connected to a limiting screw, and one end of the limiting screw abuts against the surface of the limiting guide rod 17. ， The lubrication mechanism includes two support rods 7 and a support orifice plate 8. One end of each of the two support rods 7 is fixedly connected to one side of the support orifice plate 8. Connecting slide rods 9 are fixedly connected to both sides of the top of the support orifice plate 8. Limiting plates 11 are fixedly connected to one end of each of the two connecting slide rods 9. An oil inlet head 6 is fixedly connected to the middle of the top of the guide rod sleeve 5. ，An oil supply mechanism is slidably connected between the two connecting slide rods 9, and a return spring 10 is fitted on the surface of each of the two connecting slide rods 9. ， The oil supply mechanism includes an oil storage box 12, and sliding sleeves 13 are fixedly connected to both sides of the oil storage box 12. The inside of the sliding sleeves 13 is slidably connected to the surface of the connecting slide rod 9. An oil filling port is provided at one end of the oil storage box 12, and an outlet 14 is fixedly connected to the other end of the oil storage box 12. A silicone valve head 15 is fixedly installed inside the outlet 14.

[0023] Before daily use, lubricating oil can be filled into the oil reservoir 12 through the oil filling port. Then, the oil reservoir 12 can be pressed down. One end of the return spring 10, which is sleeved on the connecting slide rod 9, is fixedly connected to the support plate 8, and the other end is fixedly connected to the sliding sleeve 13. The return spring 10 is compressed under the pressure of the sliding sleeve 13, and the outlet 14 moves with the oil reservoir 12. After moving downwards a certain distance, the silicone valve installed inside the outlet 14... The oil inlet 6 is inserted into the head 15. The end of the oil inlet 6 passing through the silicone valve head 15 has a certain taper to facilitate its passage through the silicone valve head 15. At this time, the lubricating oil inside the oil reservoir 12 will enter the gap at the connection between the limit guide rod 17 and the guide rod sleeve 5. The amount of lubricating oil added can be selected according to the actual situation. After the oil is drained, the oil reservoir 12 is gently pulled upward and, under the elastic force of the return spring 10, the oil reservoir 12 is reset. After the oil inlet 6 leaves the silicone valve head 15, the silicone valve head 15 seals the lubricating oil inside the oil reservoir 12 again.

[0024] See Figure 3 Furthermore, the guide rod assembly includes a limiting guide rod 17, which is disposed between the two guide rod sleeves 5. One end of the limiting guide rod 17 is rotatably connected to a connecting plate 18. One side of the connecting plate 18 is fixedly connected to the output end of the flameout limiter 2 by bolts. A locking mechanism is fixedly installed on one side of the connection between the connecting plate 18 and the flameout limiter 2. ， The locking mechanism includes a pin sleeve 19, a limit pin 20 is slidably connected inside the pin sleeve 19, a return spring 21 is fixedly connected between the limit pin 20 and the pin sleeve 19, and a plurality of pin holes are opened at one end of the limit guide rod 17, and one end of the limit pin 20 is engaged with the inside of the pin holes.

[0025] During use, when lubricating oil is placed into the gap between the limiting guide rod 17 and the guide rod sleeve 5, the lubricating oil may be unevenly distributed. Therefore, we pull the limiting pin 20 to move it away from the inside of the pin hole. At this time, the return spring 21 is stretched, and the limiting screw is released from the restraint of the limiting block 16. The inner diameter of the limiting block 16 is slightly larger than the diameter of the limiting guide rod 17. Then, the limiting guide rod 17 is rotated to make the lubricating oil inside more evenly distributed. After this work is completed, the limiting pin 20 is released. Under the action of the return spring 21, the limiting pin 20 returns to the inside of the pin hole. At this time, the limiting guide rod 17 is limited and cannot be rotated.

[0026] In this embodiment, when the drum rotates to wind up the wire rope 3, the rope guide 4, through which the wire rope 3 passes, moves with the position of the wire rope 3 during winding. The position of the limit block 16 on the limit guide rod 17 is pre-fixed according to site requirements. Then, when the hook reaches its upper limit, one side of the sliding rope guide 4 pushes the limit block 16 to one side, causing the limit block 16 to move and the limit guide rod 17 to move. At this time, the connecting plate 18 pushes the output end of the flameout limit switch 2, causing the flameout limit switch 2 to cut off the power to the equipment. When the hook descends to its lower limit, the rope guide 4 pushes another limit block 16, similarly causing the flameout limit switch to... The positioner 2 is triggered, causing the device to lose power. It should be noted that this utility model is a limit device for an electric hoist. All components are general standard parts or parts known to those skilled in the art. Its structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and the matching monitoring computer and power supply, are connected by wires. The specific connection method should refer to the working principle above and complete the electrical connection in the order of operation of each electrical component. The detailed connection method is a well-known technology in the field.

[0027] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electric hoist limiter device comprising an electric hoist (1) and a drum device installed inside the electric hoist (1), characterized in that: The surface of the drum is provided with a wire rope (3), a rope guide (4) is slidably connected to one side of the electric hoist (1), a fire stop limiter (2) is fixedly installed at one end of one side of the electric hoist (1), guide rod sleeves (5) are fixedly connected to both ends of the front of the electric hoist (1), a guide rod assembly is slidably connected between the two guide rod sleeves (5), and a lubrication mechanism for lubricating the connection between the limit guide rod (17) and the guide rod sleeve (5) is fixedly installed on the top of the two guide rod sleeves (5).

2. A device as claimed in claim 1, wherein: The guide rod assembly includes a limiting guide rod (17), which is disposed between two guide rod sleeves (5). One end of the limiting guide rod (17) is rotatably connected to a connecting plate (18). One side of the connecting plate (18) is fixedly connected to the output end of the fire cut-off limiter (2) by bolts. A locking mechanism is fixedly installed on one side of the connection between the connecting plate (18) and the fire cut-off limiter (2).

3. A device as claimed in claim 2, wherein: The locking mechanism includes a pin sleeve (19), a limiting pin (20) is slidably connected inside the pin sleeve (19), a return spring (21) is fixedly connected between the limiting pin (20) and the pin sleeve (19), and a plurality of pin holes are opened at one end of the limiting guide rod (17), and one end of the limiting pin (20) is engaged with the inside of the pin hole.

4. A device as claimed in claim 2, wherein: The surface of the limiting guide rod (17) is provided with two limiting blocks (16). The top of the limiting block (16) is provided with a threaded hole. The threaded hole is connected to a limiting screw. One end of the limiting screw abuts against the surface of the limiting guide rod (17).

5. A device as claimed in claim 1, wherein: The lubrication mechanism includes two support rods (7) and a support hole plate (8). One end of each of the two support rods (7) is fixedly connected to one side of the support hole plate (8). Connecting slide rods (9) are fixedly connected to both sides of the top of the support hole plate (8). Limiting plates (11) are fixedly connected to one end of each of the two connecting slide rods (9). An oil inlet head (6) is fixedly connected to the middle of the top of the guide rod sleeve (5).

6. The electric hoist limiting device according to claim 5, characterized in that: An oil supply mechanism is slidably connected between the two connecting slide rods (9), and a return spring (10) is sleeved on the surface of each of the two connecting slide rods (9).

7. The electric hoist limiting device according to claim 6, characterized in that: The oil supply mechanism includes an oil storage box (12), and sliding sleeves (13) are fixedly connected to both sides of the oil storage box (12). The interior of the sliding sleeves (13) is slidably connected to the surface of the connecting slide rod (9). An oil filling port is provided at one end of the oil storage box (12), and an outlet (14) is fixedly connected to the other end of the oil storage box (12). A silicone valve head (15) is fixedly installed inside the outlet (14).

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