Electric hoist with limiting device
By setting limit buffer components and limit switch components on the limit block of the electric hoist, the impact of the limit block on the upper limit device during the lifting of the electric hoist is solved, and the effect of reducing maintenance costs and improving use safety is achieved.
Patent Information
- Application Number
- CN202421065233.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-16
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-05-16
AI Technical Summary
When the existing electric hoist is lifted, the limit block will cause impact on the upper limiter, which may cause damage and deformation of the upper limiter, increasing maintenance costs.
An electric hoist with a limiting device is designed. By setting a limit buffer assembly and a limit switch assembly on the limiting block, the buffer plate and the buffer spring combination structure absorb the impact force, and the stroke switch receives signals through the rotating lever to control the opening and closing of the motor.
It effectively avoids impact damage to the upper limiter by the limiter, reduces the maintenance cost of the limiter, and improves the safety and reliability of the use of the electric hoist.
Smart Images
Figure CN222861000U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric hoists, in particular to an electric hoist with a limiting device. Background Art
[0002] Electric hoist is a special lifting equipment installed on overhead crane and gantry crane. It has the characteristics of small size, light weight, simple operation and easy use. The electric hoist has a compact structure, and the motor axis is perpendicular to the drum axis. The electric hoist adopts a worm gear transmission device. The electric hoist is generally installed on single-beam crane, bridge crane, gantry crane, and suspension crane. With a little modification, it can also be used as a winch. Therefore, it is an essential machine to improve labor efficiency and working conditions.
[0003] The miniature wire rope electric hoist currently on the market includes a housing, a motor and a transmission mechanism, a wire rope drum, an upper limiter, a wire rope, a limit block, and a hook. The upper limiter is set on the motor and the transmission mechanism, and the wire rope is wound on the wire rope drum. The wire rope passes through the upper limiter, the limit block, and is fixedly connected to the hook through a wire rope buckle. It can lift heavy goods and is particularly suitable for lifting heavier items from downstairs in high-rise buildings. It has a simple structure, is easy to install, is compact, and uses unidirectional electricity as a power source.
[0004] However, when the current electric hoist is lifting weights, its limit block will impact the upper limiter with a large impact force, which may cause damage to the upper limiter. Repeated impacts may cause the limiter to deform and lose its function, which will increase the maintenance cost of the limiter. Utility Model Content
[0005] The purpose of the utility model is to provide an electric hoist with a limiting device to solve the above problems.
[0006] To achieve the above-mentioned purpose, the utility model provides an electric hoist with a limit device, including a cover shell, a motor, a transmission rotating rod, a wire rope, a fixing assembly, a limit buffer assembly, and a limit switch assembly. The transmission rotating rod is rotatably connected in the cover shell, the motor is fixedly connected to the cover shell, the driving shaft of the motor passes through the side surface of the cover shell and extends into the cover shell, and is fixedly connected to the transmission rotating rod. An opening is provided on the cover shell, the wire rope is wound on the transmission rotating rod, one end of the wire rope is fixed on the transmission rotating rod, and the other end naturally hangs through the opening and is connected to a hook. A limit buffer assembly is provided at the top of the hook, and a limit switch assembly is correspondingly provided on the cover shell, and the fixing assembly is provided on the top of the cover shell.
[0007] Preferably, in the above-mentioned embodiment of an electric hoist with a limiting device, the limiting buffer assembly includes a limiting block arranged at the top end of the hook, the limiting block passes through the wire rope, is arranged on the wire rope, and is fixedly connected to the wire rope, the limiting block is provided with a buffer plate 1 and a buffer plate 2, the buffer plate 1 passes through the wire rope, is fixedly connected to the wire rope and the top of the limiting block, the buffer plate 2 passes through the wire rope, is slidably connected to the wire rope, a buffer spring is arranged between the buffer plate 1 and the buffer plate 2, and a plurality of buffer springs are provided to apply an upward elastic force to the buffer plate 2.
[0008] Preferably, in the above-mentioned embodiment of the electric hoist with a limiting device, a limiting plate is provided at the bottom opening of the cover shell, and a hole for the wire rope to pass through is provided on the limiting plate, and the wire rope passes through the hole.
[0009] Preferably, in the above-mentioned embodiment of an electric hoist with a limit device, the limit switch assembly includes a travel switch, a rotating lever, a return spring, a mounting plate is horizontally fixed at the bottom of the motor, a fixed plate is arranged at the bottom of the mounting plate, the travel switch is arranged on the fixed plate, a connecting rod is arranged on the side of the mounting plate close to the cover corresponding to the travel switch, a groove is arranged at the bottom of the connecting rod, the rotating lever is arranged in the groove and is rotatably connected to the connecting rod through a rotating shaft, one end of the return spring is fixedly connected to the bottom of the cover, and the other end is fixedly connected to the rotating lever.
[0010] Preferably, in the above-mentioned embodiment of an electric hoist with a limit device, one end of the rotating lever close to the travel switch is set to a hook-shaped structure, and the other end is a straight rod, the curvature of the outer arc surface of the hook-shaped structure matches the curvature of the travel switch contact, and when the straight rod of the rotating lever is in a horizontal state, the end of the hook-shaped structure just contacts the travel switch contact, and the return spring is fixedly connected to the straight rod of the rotating lever.
[0011] Preferably, in the above-mentioned embodiment of an electric hoist with a limiting device, a buffer gasket 1 and a buffer gasket 2 are provided at the bottom of the cover shell, and the buffer gasket 1 and the buffer gasket 2 are respectively provided on both sides of the cover shell opening, and the buffer gasket 1 is fixedly connected to the bottom of the cover shell and provided close to the rotating lever, and the thickness of the buffer gasket 1 satisfies that when the straight rod of the rotating lever is in a horizontal state, the end of the straight rod of the rotating lever just contacts with the buffer gasket 1, and the thickness of the buffer gasket 2 satisfies that when the straight rod of the rotating lever is in a horizontal state, the bottom surface of the buffer gasket 2 and the bottom surface of the straight rod of the rotating lever are located in the same horizontal plane.
[0012] Preferably, in the above-mentioned embodiment of the electric hoist with a limit device, the travel switch is electrically connected to the electric switch of the motor.
[0013] Therefore, the utility model adopts an electric hoist with a limit device of the above structure. By arranging a limit buffer assembly on the limit block, it can ensure that when the wire rope drives the hook to move upward to the upper limit position, no damage will be caused to the hook or the cover shell. The buffer plate 2 will squeeze the buffer spring to form a buffer force, and no damage will be caused due to excessive impact force. The travel switch of the limit switch assembly does not directly contact the limit buffer assembly, and there will be no direct impact force on the limit switch assembly. The travel switch receives a signal by rotating the lever to control the opening and closing of the motor, thereby reducing the maintenance cost of the damaged travel switch.
[0014] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a structural schematic diagram of an electric hoist embodiment with a limiting device of the utility model;
[0016] Figure 2 This is a front view of an embodiment of an electric hoist with a limiting device according to the utility model;
[0017] Figure 3 The utility model is an electric hoist with a limiting device. Figure 1 Schematic diagram at point a in the figure. DETAILED DESCRIPTION
[0018] The technical solution of the utility model is further described below through the accompanying drawings and embodiments.
[0019] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0020] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.
[0021] See also Figure 1-3As shown, an electric hoist with a limit device according to an embodiment of the present application is described, including a cover shell 1, a motor 2, a transmission rotating rod, a wire rope 3, a fixing component 4, a limit buffer component 5, and a limit switch component 6. The cover shell 1 is rotatably connected with the transmission rotating rod, the motor 2 is fixedly connected to the cover shell 1, the driving shaft of the motor 2 passes through the side surface of the cover shell 1 and extends into the cover shell 1, and is fixedly connected to the transmission rotating rod. An opening is provided on the cover shell 1, the wire rope 3 is wound on the transmission rotating rod, one end of the wire rope 3 is fixed on the transmission rotating rod, and the other end is naturally hung through the opening and connected to a hook 31, a limit buffer component 5 is provided at the top of the hook 31, and a limit switch component 6 is correspondingly provided on the cover shell 1, and the fixing component 4 is provided on the top of the cover shell 1.
[0022] Specifically, the electric hoist is installed on the installation point of the crane through the fixing assembly 4, and the limit switch assembly 6 and the limit buffer assembly 5 play a limit protection role on the upper limit position of the hook 31.
[0023] To further optimize the above technical solution, the limit buffer assembly 5 includes a limit block 51 arranged at the top of the hook 31, the limit block 51 passes through the wire rope 3, is arranged on the wire rope 3, and is fixedly connected to the wire rope 3, a buffer plate 1 52 and a buffer plate 2 53 are arranged on the limit block 51, the buffer plate 1 52 passes through the wire rope 3, and is fixedly connected to the wire rope 3 and the top of the limit block 51, the buffer plate 2 53 passes through the wire rope, and is slidably connected to the wire rope 3, a buffer spring 54 is arranged between the buffer plate 1 52 and the buffer plate 2 53, and a plurality of buffer springs 54 are arranged to apply an upward elastic force to the buffer plate 2 53.
[0024] In order to further optimize the above technical solution, a limit plate 11 is provided at the bottom opening of the cover shell 1. The limit plate 11 is provided with a hole for the wire rope 3 to pass through, and the wire rope 3 passes through the hole.
[0025] Specifically, by setting the limit plate 11, the wire rope 3 can only move up and down through the hole of the limit plate 11, and the hook 31 will not shake due to the different positions of the wire rope 3 wound on the transmission rod, ensuring that the buffer plate 2 53 can touch the rotating lever 62.
[0026] To further optimize the above technical solution, the limit switch assembly 6 includes a travel switch 61, a rotating lever 62, and a return spring 63. A mounting plate 21 is horizontally fixed at the bottom of the motor 2, a fixed plate 22 is arranged at the bottom of the mounting plate 21, the travel switch 61 is arranged on the fixed plate 22, and a connecting rod 23 is arranged on the side of the mounting plate 21 close to the cover 1 corresponding to the travel switch 61. A groove is arranged at the bottom of the connecting rod 23, the rotating lever 62 is arranged in the groove and is rotatably connected to the connecting rod 23 through a rotating shaft, one end of the return spring 63 is fixedly connected to the bottom of the cover 1, and the other end is fixedly connected to the rotating lever 62.
[0027] Specifically, by providing the rotating lever 62, it can be ensured that the travel switch 61 only receives signals by contacting the rotating lever 62, will not be damaged by a large impact force, and will not be easily damaged by long-term use, thereby reducing maintenance costs.
[0028] In order to further optimize the above technical solution, one end of the rotating lever 62 close to the travel switch 61 is set to a hook structure, and the other end is a straight rod. The curvature of the outer arc surface of the hook structure matches the curvature of the contact of the travel switch 61. When the straight rod of the rotating lever 62 is in a horizontal state, the end of the hook structure just contacts the contact of the travel switch 61, and the return spring 63 is fixedly connected to the straight rod of the rotating lever 62.
[0029] To further optimize the above technical solution, a buffer gasket 64 and a buffer gasket 65 are provided at the bottom of the cover shell 1. The buffer gasket 64 and the buffer gasket 65 are respectively provided on both sides of the opening of the cover shell 1. The buffer gasket 64 is fixedly connected to the bottom of the cover shell 1 and is provided close to the rotating lever 62. The thickness of the buffer gasket 64 satisfies that when the straight rod of the rotating lever 62 is in a horizontal state, the end of the straight rod of the rotating lever 62 just contacts with the buffer gasket 64. The thickness of the buffer gasket 65 satisfies that when the straight rod of the rotating lever 62 is in a horizontal state, the bottom surface of the buffer gasket 65 and the bottom surface of the straight rod of the rotating lever 62 are located in the same horizontal plane.
[0030] Specifically, buffer gasket 1 64 and buffer gasket 2 65 are set to have different thicknesses. The thickness of buffer gasket 2 65 satisfies that when the straight rod of the rotating lever 62 is in a horizontal state and contacts with buffer gasket 1 64, the bottom surface of buffer gasket 2 65 and the bottom surface of the straight rod of the rotating lever 62 are located in the same horizontal plane, which can ensure that buffer plate 2 53 can maintain a horizontal state when it moves upward to the upper limit position, will not cause the hook 31 to tilt, and will not affect the safety of lifting.
[0031] In order to further optimize the above technical solution, the travel switch 61 is electrically connected to the electric switch of the motor 2 , and the motor 2 can be controlled to be turned off through the travel switch 61 .
[0032] Working principle: during the use of the electric hoist, when it is necessary to lift the wire rope 3, the transmission rotating rod is driven to rotate under the drive of the motor 2, and the wire rope 3 drives the hook 31 to move upward. When it reaches the upper limit position, the buffer plate 2 53 first touches the rotating lever 62, and the rotating lever 62 compresses the return spring 63, rotates to a horizontal state, and contacts with the buffer gasket 1 64. One end of its hook-shaped structure contacts the contact point of the travel switch 61, and the other end of the buffer plate 2 53 contacts with the buffer gasket 2 65. The buffer plate 2 53 compresses the buffer spring 54 to form a buffer force. At the same time, the travel switch 61 receives a signal to turn off the electric switch of the motor 2, and the motor 2 stops running. The wire rope 3 drives the hook 31 to reach the upper limit position and stops. When the wire rope 3 drives the hook 31 to descend, the rotating lever 62 returns to the initial position under the elastic force of the return spring and the gravity of its own straight rod end. The buffer plate 2 53 returns to its original position under the elastic force of the buffer spring 54, and the hook 31 continues to perform the lifting work.
[0033] Therefore, the utility model adopts an electric hoist with a limit device of the above structure. By arranging a limit buffer assembly 5 on the limit block 51, it can ensure that when the wire rope 3 drives the hook 31 to move upward to the upper limit position, no damage will be caused to the hook 31 or the cover 1. The buffer plate 53 will squeeze the buffer spring 54 to form a buffer force, and no damage will be caused due to excessive impact force. The travel switch 61 of the limit switch assembly 6 does not directly contact the limit buffer assembly 5, and there will be no direct impact force on the travel switch 61. The travel switch 61 receives the signal by rotating the trigger rod 62 to control the opening and closing of the motor 2, thereby reducing the maintenance cost of the damaged travel switch 61.
[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that they can still modify or replace the technical solution of the utility model with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the utility model.
Claims
1. An electric hoist with a limiting device, characterized in that: The invention comprises a housing (1), a motor (2), a transmission rotating rod, a wire rope (3), a fixing assembly (4), a limit buffer assembly (5), and a limit switch assembly (6). The housing (1) is rotatably connected with the transmission rotating rod. The motor (2) is fixedly connected to the housing (1). The drive shaft of the motor (2) penetrates the side surface of the housing (1) and extends into the housing (1) and is fixedly connected to the transmission rotating rod. The housing (1) is provided with an opening. The wire rope (3) is wound around the transmission rotating rod. One end of the wire rope (3) is fixed to the transmission rotating rod, and the other end of the wire rope (3) is naturally hung through the opening and connected to a hook (31). A limit buffer assembly (5) is provided at the top of the hook (31), and a limit switch assembly (6) is correspondingly provided on the housing (1). The fixing assembly (4) is provided at the top of the housing (1).
2. The electric hoist with a limiting device according to claim 1, characterized in that: The limit buffer assembly (5) comprises a limit block (51) arranged at the top end of the hook (31); the limit block (51) passes through the steel wire rope (3), is arranged on the steel wire rope (3), and is fixedly connected to the steel wire rope (3); a buffer plate 1 (52) and a buffer plate 2 (53) are arranged on the limit block (51); the buffer plate 1 (52) passes through the steel wire rope (3), and is fixedly connected to the steel wire rope (3) and the top of the limit block (51); the buffer plate 2 (53) passes through the steel wire rope (3), and is slidably connected to the steel wire rope (3); a buffer spring (54) is arranged between the buffer plate 1 (52) and the buffer plate 2 (53); a plurality of buffer springs (54) are arranged to apply an upward elastic force to the buffer plate 2 (53).
3. The electric hoist with a limiting device according to claim 2, characterized in that: A limit plate (11) is provided at the bottom opening of the cover shell (1), and a hole for the steel wire rope (3) to pass through is provided on the limit plate (11), and the steel wire rope (3) passes through the hole.
4. The electric hoist with a limiting device according to claim 3, characterized in that: The limit switch assembly (6) comprises a travel switch (61), a rotating lever (62), and a return spring (63). A mounting plate (21) is fixedly arranged horizontally at the bottom of the motor (2). A fixing plate (22) is arranged at the bottom of the mounting plate (21). The travel switch (61) is arranged on the fixing plate (22). A connecting rod (23) is arranged on the side of the mounting plate (21) close to the housing (1) corresponding to the travel switch (61). A groove is arranged at the bottom of the connecting rod (23). The rotating lever (62) is arranged in the groove and is rotatably connected to the connecting rod (23) via a rotating shaft. One end of the return spring (63) is fixedly connected to the bottom of the housing (1), and the other end is fixedly connected to the rotating lever (62).
5. The electric hoist with a limiting device according to claim 4, characterized in that: One end of the rotating lever (62) close to the travel switch (61) is set as a hook structure, and the other end is a straight rod. The curvature of the outer arc surface of the hook structure matches the curvature of the contact of the travel switch (61). When the straight rod of the rotating lever (62) is in a horizontal state, the end of the hook structure just contacts the contact of the travel switch (61). The return spring (63) is fixedly connected to the straight rod of the rotating lever (62).
6. The electric hoist with a limiting device according to claim 5, characterized in that: The bottom of the housing (1) is provided with a buffer gasket 1 (64) and a buffer gasket 2 (65). The buffer gasket 1 (64) and the buffer gasket 2 (65) are respectively arranged on both sides of the opening of the housing (1). The buffer gasket 1 (64) is fixedly connected to the bottom of the housing (1) and arranged near the rotating lever (62). The buffer gasket 1 (64) has a thickness that satisfies that when the straight rod of the rotating lever (62) is in a horizontal state, the end of the straight rod of the rotating lever (62) just contacts the buffer gasket 1 (64). The thickness of the buffer gasket 2 (65) is such that when the straight rod of the rotating lever (62) is in a horizontal state, the bottom surface of the buffer gasket 2 (65) and the bottom surface of the straight rod of the rotating lever (62) are located in the same horizontal plane.
7. The electric hoist with a limiting device according to claim 4, characterized in that: The travel switch (61) is electrically connected to the electric switch of the motor (2).