一种具有蜗杆自锁机构的手摇吊机
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU XINGXIONGQI INTELLIGENT TECHNOLOGY CO LTD
- Filing Date
- 2025-10-20
- Publication Date
- 2026-07-17
AI Technical Summary
Existing hand-cranked cranes are prone to rotation or loosening after operation is stopped due to the reaction force of heavy objects, posing a safety risk. Furthermore, their structural space is limited, making compact integration impossible, and their transmission mechanisms are complex and require frequent maintenance.
The system employs a worm gear self-locking transmission combined with a ratchet anti-reverse mechanism and a spiral clamp self-locking device to form a multi-stage self-locking and auxiliary braking structure. The geometric self-locking characteristics of the worm gear prevent the hook from slipping and achieve a large transmission ratio and smooth operation within a limited space.
It prevents the hook from slipping when the operation is stopped, ensures smooth and reliable transmission, and provides high operational safety. It is suitable for hoisting needs in confined spaces such as machine tool lighting installation.
Smart Images
Figure CN224513069U_ABST
Abstract
Claims
1. A hand-cranked crane with a worm gear self-locking mechanism, comprising a base, a column (102) rotatable relative to the base, and a lifting arm (103) pivotally connected to the column, wherein the distal end of the lifting arm (103) is provided with a hook (104) for connecting to the cargo, and a chain (107) is provided inside the lifting arm (103) and the column (102), wherein the chain (107) hangs down after changing direction via a guide wheel or sprocket at the front end of the lifting arm (103) and is connected to the hook (104); Its features are: A self-locking worm gear transmission mechanism is provided, the self-locking worm gear transmission mechanism includes a worm (201) with a lead angle less than the self-locking threshold and a worm wheel (202) meshing with it; The worm gear (201) is driven by a hand crank (105), and the worm wheel (202) is fixedly connected to a sprocket (203) arranged along the lifting arm. The sprocket (203) provides the chain driving force to pull the inside of the lifting arm. When the hand crank (105) stops cranking, the worm (201) prevents the worm wheel (202) from rotating in the opposite direction, preventing the chain from moving in the opposite direction, so that the hook (104) will not descend on its own under load.
2. The hand winch with a worm self-locking mechanism according to claim 1, characterized in that: An internal first gear (204) is provided in the column (102) to drive the chain (107) inside the column (102) and the lifting arm (103); The second gear (205) is connected to the first gear (204) via the first shaft (206); the sprocket (203) drives the second gear (205), and the diameter of the sprocket (203) is smaller than that of the second gear (205).
3. The hand winch with a worm self-locking mechanism according to claim 2, characterized in that: The diameter of the second gear (205) is greater than the diameter of the first gear (204), and the diameter of the sprocket (203) is smaller than the diameter of the second gear (205).
4. The hand winch with a worm self-locking mechanism according to claim 2, characterized in that, It also includes a ratchet anti-reverse mechanism (301), which includes a ratchet (303) and a pawl (304). One end of the pawl (304) is hinged to the support (307) by a pin (305), and the other end is pressed against the ratchet tooth surface under the action of a spring (306) to form a one-way engagement when the sprocket (203) rotates in the forward direction and to form an anti-reverse mechanism when it rotates in the reverse direction.
5. The hand winch with a worm self-locking mechanism according to claim 2, characterized in that, The second gear (205) is provided with a spiral clamp self-locking device (302) on its outer side. The spiral clamp self-locking device (302) includes a spiral clamp (310), which is a strip-shaped elastic element. It is spirally wound around the outer circle of the second gear (205) and forms a partially covered structure. It generates a radial clamping force of 50-500N on the outer circle of the second gear (205) through its own elastic deformation. The spiral clamp (310) has a free end (3101), which extends to the outside of the crane housing and forms an operating lever (311). By pushing the operating lever (311) against the spiral direction of the spiral clamp (310), the elastic deformation of the spiral clamp (310) can be reduced to release the radial clamping force on the outer circle of the second gear (205), thereby allowing the second gear (205) to rotate freely.
6. The hand-operated hoist of claim 1, wherein: The self-locking threshold is the equivalent friction angle of the worm gear, and the equivalent friction angle is... , where is the equivalent friction coefficient.
7. The hand-operated hoist of claim 1, wherein: The worm (201) is connected to the hand crank (105) via a set of meshing bevel gears (207) or cylindrical gears. The hand crank (105) is located on the outside of the column (102). The bevel gears (207) or cylindrical gears are used to change the transmission direction.
8. The hand-operated hoist of claim 1, wherein: The worm (201) and worm wheel (202) are installed in a sealed gearbox with a removable cover, and the worm (201) is arranged along the direction parallel to the upright.