Electric hoist ascending limiting device
By installing a limit device for the metal frame and proximity switch on the electric hoist, the limit position of the heavy object is sensed and the motor is cut off. Combined with the alarm warning, the problem of the electric hoist being difficult to accurately judge the limit height in dim light is solved, and the safety and reliability of the equipment are improved.
Patent Information
- Application Number
- CN202422599322.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-10-28
AI Technical Summary
When operating the electric hoist in dim light, it is difficult for workers to accurately judge the maximum height of the heavy object, causing the hook to continue to rise, which may damage the equipment or cause an accident.
A power hoist uplift limit device is designed, using a metal frame and proximity switch, which is suspended under the electric hoist through a suspended rope, and the motor is cut off by using the proximity switch sensing signal, and combined with an alarm to warn the operator to ensure that the heavy object stops lifting when it reaches the limit position.
Improve the safety performance of electric hoists, prevent lifting accidents, and ensure the safety of equipment and personnel.
Smart Images
Figure CN223254774U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a limiting device, in particular to an electric hoist rising limiting device, belonging to the technical field of electrical control. Background Art
[0002] Electric hoist is a device used to lift heavy objects. Its specific structure is as follows: Figure 1 As shown, the electric hoist body 8 is mounted on an overhead crane. The interior of the electric hoist body 8 includes a motor 11, a reducer, a drum, and a brake system. The motor 11 drives the reducer through a coupling, which in turn drives the drum to rotate. The wire rope 10 drives the movable pulley 6, which in turn drives the hook up or down, thereby lifting and transporting a heavy object 7. Electric hoists have the advantages of small size, light weight, simple operation, and ease of use. They are widely used in industrial and mining enterprises, warehouses, docks, and other places.
[0003] When operators use electric hoists to lift heavy objects, they rely entirely on their visual sense to determine the maximum height the load can reach. However, in most cases, the lighting in the working environment of electric hoists is relatively dim, which can easily affect the observer's vision, leading to misjudgment and failure to shut off the electric hoist before the load reaches the maximum height. This causes the hook to continue rising, damaging the electric hoist. In serious cases, the lifting wire rope may even break, causing the load to fall. Utility Model Content
[0004] In order to solve the above technical problems, the utility model provides an electric hoist rising limit device. When the hoist is lifted to the limit position, the proximity switch will cut off the power supply of the motor through the lead I, so that the lifting mechanism stops running, preventing the occurrence of lifting accidents and improving the safety performance of the equipment.
[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:
[0006] An electric hoist rising limit device includes a metal frame, a limit ring is provided on the top of the metal frame, and the entire device is suspended below the electric hoist body by a suspension rope. A proximity switch is installed at the bottom of the metal frame, which can sense signals and is connected to the motor of the electric hoist through lead I. Guide rings with a limiting function are provided on both sides of the metal frame, and a steel wire rope passes through a guide hole on the guide ring.
[0007] A further improvement of the technical solution of the present utility model is that an alarm is installed inside the electric hoist body, and the alarm is connected to the proximity switch through lead II.
[0008] A further improvement of the technical solution of the present invention is that the metal frame is a frame welded from metal rods, metal plates or triangular steels.
[0009] A further improvement of the technical solution of the present utility model is that: the guide hole on the guide ring is elliptical.
[0010] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:
[0011] The utility model is suspended below the electric hoist body by a lifting rope. When the electric hoist lifts a heavy object through the steel wire rope and the movable pulley, when the heavy object is raised to the limit position, the proximity switch will sense the signal and cut off the motor of the electric hoist through the lead wire I, so that the electric hoist stops running, thereby preventing the occurrence of lifting accidents and improving the safety performance of the equipment; guide rings with a limiting function are provided on both sides of the metal frame, and the steel wire rope passes through the guide holes on the guide rings, which can ensure that the movable pulley and the heavy object are always directly below the proximity switch, so that the proximity switch can more accurately sense the height of the movable pulley and the heavy object.
[0012] The utility model discloses an electric hoist equipped with an alarm device. When the electric hoist receives a signal transmitted from a proximity switch, the alarm device will sound to warn the workers in the workshop that the heavy object has been lifted to the highest position. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a working principle diagram of the utility model;
[0014] Figure 2 It is a schematic diagram of the structure of the utility model;
[0015] Among them, 1. Limit lifting ring; 2. Metal frame; 3. Guide ring; 4. Proximity switch; 5. Lead I; 6. Movable pulley; 7. Heavy object; 8. Electric hoist body; 9. Alarm; 10. Wire rope; 11. Motor; 12. Lead II. DETAILED DESCRIPTION
[0016] The present invention is further described in detail below with reference to the embodiments:
[0017] like Figure 2 As shown, an electric hoist rising limit device includes a limit ring 1, a metal frame 2, a guide ring 3, a proximity switch 4, a lead Ⅰ5 and a lead Ⅱ12, and the metal frame 2 is a frame formed by welding metal plates; Figure 1As shown, the electric hoist body 8 passes through the limit lifting ring 1 through the lifting rope below to lift the entire device, and a proximity switch 4 is installed at the bottom of the metal frame 2. When the electric hoist body 8 lifts the heavy object 7 through the wire rope 10 and the movable pulley 6, when the heavy object 7 is raised to the limit position, the proximity switch 4 will sense the signal and cut off the motor 11 of the electric hoist through the lead Ⅰ 5, preventing the occurrence of lifting accidents and improving the safety performance of the equipment; the wire rope 10 passes through the elliptical guide hole on the guide ring 3, which can ensure that the movable pulley 6 and the heavy object 7 are always directly below the proximity switch 4, making the proximity switch 4 more accurate in sensing the height of the movable pulley 6 and the heavy object 7; an alarm 9 is also installed inside the electric hoist body 8, and the alarm 9 is connected to the proximity switch 4 through the lead Ⅱ 12. When the heavy object 7 is raised to the limit position, the proximity switch 4 turns on the alarm 9 through the lead Ⅱ 12 to sound an alarm to warn the staff in the workshop that the heavy object 7 has been raised to the highest position.
[0018] Working principle: The utility model is suspended below the electric hoist body 8 through a lifting rope. When the electric hoist body 8 lifts the heavy object 7 through the wire rope 10 and the movable pulley 6, when the heavy object 7 rises to the limit position, the proximity switch 4 will sense the signal and cut off the motor 11 of the electric hoist through the lead 5, preventing the occurrence of lifting accidents and improving the safety performance of the equipment.
Claims
1. An electric hoist rising limit device, characterized by: The invention comprises a metal frame (2), the top of the metal frame (2) is provided with a limit ring (1) for suspending the entire device below the electric hoist body (8) through a suspension rope, the bottom of the metal frame (2) is provided with a proximity switch (4) that can sense signals and is connected to the motor (11) of the electric hoist through a lead I (5), and both sides of the metal frame (2) are provided with guide rings (3) for limiting the position, and a steel wire rope (10) passes through a guide hole on the guide ring (3).
2. The electric hoist rising limit device according to claim 1, characterized in that: An alarm (9) is installed inside the electric hoist body (8), and the alarm (9) is connected to the proximity switch (4) through a lead II (12).
3. The electric hoist rising limit device according to claim 1, characterized in that: The metal frame (2) is a frame formed by welding metal rods, metal plates or triangular steel.
4. The electric hoist rising limit device according to claim 1, characterized in that: The guide hole on the guide ring (3) is elliptical.