Safety limiting device for steel wire rope electric hoist
By introducing a limiting component into the wire rope electric hoist, and utilizing the meshing of the limiting gear and rack, the rising and falling height of the hook is limited, thus solving the problems of hook impact with the electric hoist and cargo collision, and achieving protection for both equipment and goods.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TOPTEC HOISTING MASCH WUXI CO LTD
- Filing Date
- 2025-06-03
- Publication Date
- 2026-05-08
AI Technical Summary
Existing wire rope electric hoists are prone to collisions when the hook rises to the upper limit of the height limit, and the goods are prone to collisions with the ground when descending to the lower limit of the height limit, resulting in equipment damage.
The system employs a limiting assembly, including a limiting gear and a bracket. A drive motor rotates the drum, and the limiting gear engages with the rack to limit the upper limit of the hook's lifting height and the lower limit of its lowering height, thus preventing collisions between the hook and the electric hoist or the goods.
This effectively prevents the hook from colliding with the electric hoist and the goods from directly hitting the ground, protecting the equipment and goods.
Smart Images
Figure CN224212331U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to lifting technology, specifically a safety limit device for a wire rope electric hoist. Background Technology
[0002] Wire rope electric hoists are small lifting equipment with advantages such as compact structure, light weight, small size, strong component versatility, and convenient operation. They are mainly used for various lifting, pulling, loading and unloading of heavy objects, oil tank inversion welding, installation and movement of various large and medium-sized concrete, steel structures and mechanical equipment. They are suitable for civil engineering projects in construction and installation companies, factories and mines, as well as bridge construction, power, shipbuilding, automobile manufacturing, construction, highways, bridges, metallurgy, mining, slope tunnels, well treatment and protection and other basic construction projects.
[0003] Electric hoists are generally operated by personnel, but the operators mainly rely on visual inspection to confirm the height of the hook. This makes it very easy for the hook to rise to the upper limit of the height and then hit the electric hoist, damaging it. Moreover, electric hoists are widely used for lifting heavy objects, and the hoist will not stop when the goods are about to fall to the lower limit of the height. If the operator fails to observe carefully, the goods can easily collide directly with the ground and be damaged. Utility Model Content
[0004] To address the shortcomings of the prior art, this utility model provides a safety limit device for a wire rope electric hoist, which can limit the upper limit of the hook's rising height and the lower limit of its falling height, preventing the hook from colliding with the electric hoist and the goods from directly impacting the ground.
[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: a safety limit device for a wire rope electric hoist, comprising an outer cover, a drum rotatably connected inside the outer cover, a drive motor and a reduction gearbox fixed on one side of the outer cover, the drive motor driving the drum to rotate through the reduction gearbox, a wire rope wound on the drum, the wire rope passing over a hook and then fixed to the outer cover, the hook being located below the drum, a limit component provided on the reduction gearbox, and a traveling component provided on the top of the outer cover;
[0006] The limiting component includes a limiting gear and a bracket. The bracket has sliders at its bottom perimeter, which slide in cooperation with the guide rail. The bracket has a rack on one side. The limiting gear is connected to the drive motor via a reduction gearbox and meshes with the rack. The bracket has an adjustment unit at its top, which drives an adjustment plate to move. The adjustment plate is located inside the bracket.
[0007] Preferably, the walking assembly includes a walking gearbox, a walking motor is provided on one side of the walking gearbox, and two walking wheels are provided on the other side of the walking gearbox. The walking motor drives the two walking wheels to rotate in the same direction through the walking gearbox.
[0008] Preferably, the gearbox is provided with a drive gear and a gear ring. The drive gear is connected to the output shaft of the drive motor. The gear ring is coaxially fixed to the drum. The drive gear meshes with the driven gear. The driven gear is coaxially arranged with the driving gear. The driving gear meshes with the gear ring. The gear ring meshes with the transmission gear. The transmission gear is coaxially arranged with the first bevel gear. The first bevel gear meshes with the second bevel gear. The second bevel gear is coaxially arranged with the limit gear.
[0009] Preferably, the adjustment unit includes a limit motor and a lead screw. The limit motor is fixed to one end of the bracket facing the limit gear. One end of the lead screw is connected to the output shaft of the limit motor. The other end of the lead screw is rotatably connected to the end of the bracket away from the limit gear. The lead screw is threaded with a positioning plate. Guide rods are arranged parallel to each other on both sides of the lead screw. The guide rods are fixed to the top of the bracket and pass through the positioning plate.
[0010] In summary, this utility model achieves the following technical effects:
[0011] The safety limit device for the wire rope electric hoist of this utility model adopts a limit component, which can drive the limit gear to rotate as the drum rotates, so that the rack and bracket can move. When the two ends of the bracket abut against the limit gear, the limit gear can no longer rotate, thereby limiting the upper limit of the lifting height and the lower limit of the lowering height of the hook, and preventing the hook from hitting the electric hoist and the goods from directly hitting the ground. Attached Figure Description
[0012] Figure 1 This is a structural schematic diagram of the safety limit device for the wire rope electric hoist of this utility model;
[0013] Figure 2 This is a schematic diagram of the internal structure of the gearbox of the safety limit device for the wire rope electric hoist of this utility model;
[0014] Figure 3 This is a schematic diagram of the limit component of the safety limit device for wire rope electric hoists according to this utility model;
[0015] Explanation of reference numerals in the accompanying drawings: 1. Drum; 2. Drive motor; 3. Gearbox; 31. Drive gear; 32. Driven gear; 33. Driving gear; 34. Gear ring; 35. Transmission gear; 36. First bevel gear; 37. Second bevel gear; 4. Hook; 5. Traveling assembly; 6. Limiting assembly; 61. Guide rail; 62. Slider; 63. Bracket; 64. Rack; 65. Guide rod; 66. Lead screw; 67. Positioning plate; 68. Limiting gear; 69. Limiting motor. Detailed Implementation
[0016] The present invention will be further described in detail below with reference to the accompanying drawings.
[0017] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.
[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0021] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0022] Example 1:
[0023] like Figure 1 As shown, a safety limit device for a wire rope electric hoist includes an outer cover, inside which a drum 1 is rotatably connected. A drive motor 2 and a reduction gearbox 3 are fixed on one side of the outer cover. The drive motor 2 drives the drum 1 to rotate through the reduction gearbox 3. A wire rope is wound on the drum 1. The wire rope passes over a hook 4 and is fixed to the outer cover. The hook 4 is located below the drum 1. A limit component 6 is provided on the reduction gearbox 3. A traveling component 5 is provided on the top of the outer cover.
[0024] like Figure 3 As shown, the limiting component 6 includes a limiting gear 68 and a bracket 63. The bracket 63 has sliders 62 at its bottom perimeter, which slide in cooperation with the guide rail 61. The bracket 63 has a rack 64 on one side. The limiting gear 68 is connected to the drive motor 2 via a reduction gearbox 3. The limiting gear 68 meshes with the rack 64. The bracket 63 has an adjustment unit at its top, which drives an adjustment plate to move. The adjustment plate is located inside the bracket 63.
[0025] The adjustment unit includes a limit motor 69 and a lead screw 66. The limit motor 69 is fixed to one end of the bracket 63 facing the limit gear 68. One end of the lead screw 66 is connected to the output shaft of the limit motor 69, and the other end of the lead screw 66 is rotatably connected to the end of the bracket 63 away from the limit gear 68. The positioning plate 67 is threaded onto the lead screw 66. Guide rods 65 are arranged parallel to each other on both sides of the lead screw 66. The guide rods 65 are fixed to the top of the bracket 63 and pass through the positioning plate 67. Proximity switches are provided at both the end of the bracket 63 facing the limit gear 68 and the positioning plate 67. The proximity switches are connected to the drive motor at two points.
[0026] The adjustment unit can adjust the position of the positioning plate 67, thereby adjusting the lower limit of the descent height. The limit motor 69 drives the lead screw 66 to rotate, causing the positioning plate 67 to move toward or away from the limit gear 68. When the limit gear 68 and the bracket 63 are in contact with the end facing the limit motor 69, this is the upper limit of the lifting height of the hook 4. When the limit gear 68 is in contact with the positioning plate 67, this is the lower limit of the descent height of the hook 4. The proximity switch can realize contactless control of the drive motor 2 to prevent the limit gear 68 from directly colliding with the positioning plate 67 or the bracket 63, thus preventing damage to the limit gear 68, the positioning plate 67, and the bracket 63.
[0027] The safety limit device for the wire rope electric hoist in this embodiment uses a limit component 6, which can drive the limit gear 68 to rotate as the drum 1 rotates, causing the rack 64 and the bracket 63 to move. When both ends of the bracket 63 abut against the limit gear 68, the limit gear 68 can no longer rotate, thereby limiting the upper limit of the lifting height and the lower limit of the lowering height of the hook 4, preventing the hook 4 from hitting the electric hoist and the goods from directly hitting the ground.
[0028] Preferably, the walking assembly 5 includes a walking gearbox, a walking motor is provided on one side of the walking gearbox, and two walking wheels are provided on the other side of the walking gearbox. The walking motor drives the two walking wheels to rotate in the same direction through the walking gearbox.
[0029] like Figure 2 As shown, the reduction gearbox 3 is equipped with a drive gear 31 and a gear ring 34. The drive gear 31 is connected to the output shaft of the drive motor 2. The gear ring 34 is coaxially fixed with the drum 1. The drive gear 31 meshes with the driven gear 32. The driven gear 32 is coaxially arranged with the driving gear 33. The driving gear 33 meshes with the gear ring 34. The gear ring 34 meshes with the transmission gear 35. The transmission gear 35 is coaxially arranged with the first bevel gear 36. The first bevel gear 36 meshes with the second bevel gear 37. The second bevel gear 37 is coaxially arranged with the limit gear 68.
[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.
Claims
1. A safety limit device for a wire rope electric hoist, characterized in that, The device includes an outer cover, inside which a drum is rotatably connected. A drive motor and a gearbox are fixed on one side of the outer cover. The drive motor drives the drum to rotate through the gearbox. A steel wire rope is wound on the drum. The steel wire rope passes around a hook and is fixed to the outer cover. The hook is located below the drum. A limit component is provided on the gearbox. A traveling component is provided on the top of the outer cover. The limiting component includes a limiting gear and a bracket. The bracket has sliders at its bottom perimeter, which slide in cooperation with the guide rail. The bracket has a rack on one side. The limiting gear is connected to the drive motor via a reduction gearbox and meshes with the rack. The bracket has an adjustment unit at its top, which drives an adjustment plate to move. The adjustment plate is located inside the bracket.
2. The safety limit device for a wire rope electric hoist according to claim 1, characterized in that, The walking assembly includes a walking gearbox, a walking motor is provided on one side of the walking gearbox, and two walking wheels are provided on the other side of the walking gearbox. The walking motor drives the two walking wheels to rotate in the same direction through the walking gearbox.
3. The safety limit device for a wire rope electric hoist according to claim 1, characterized in that, The gearbox is equipped with a drive gear and a gear ring. The drive gear is connected to the output shaft of the drive motor. The gear ring is fixedly coaxially with the drum. The drive gear meshes with the driven gear. The driven gear is coaxially with the driving gear. The driving gear meshes with the gear ring. The gear ring meshes with the transmission gear. The transmission gear is coaxially with the first bevel gear. The first bevel gear meshes with the second bevel gear. The second bevel gear is coaxially with the limit gear.
4. The safety limit device for a wire rope electric hoist according to claim 1, characterized in that, The adjustment unit includes a limit motor and a lead screw. The limit motor is fixed to one end of the bracket facing the limit gear. One end of the lead screw is connected to the output shaft of the limit motor. The other end of the lead screw is rotatably connected to the end of the bracket away from the limit gear. The lead screw is threaded with a positioning plate. Guide rods are arranged parallel to each other on both sides of the lead screw. The guide rods are fixed to the top of the bracket and pass through the positioning plate.