Hoisting mechanism of anti-unhooking hook on crane
By designing protective covers and limit structures on the crane hook, the problem of the anti-decoupling sleeve being moved upward due to shaking during the lifting process is solved, and higher safety and stability are achieved.
Patent Information
- Application Number
- CN202422322255.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-09-24
AI Technical Summary
During the lifting process, existing crane hooks are prone to move and unhook due to shaking, which poses a risk of decoupling and affects production safety.
An anti-dehooking lifting mechanism is designed, and a protective cover and a limiting structure are provided on the hook. The upward movement of the protective cover is effectively prevented by the limiting structure of the limiting column and the eccentric shaft. Through the cooperation of the torsion spring and the lever, the protective cover is further ensured that the protective cover does not detach from the hook.
It effectively prevents decoupling accidents caused by upward movement of the protective cover, improves safety and stability during lifting, and reduces the occurrence of personal and equipment accidents.
Smart Images
Figure CN222974692U_ABST
Abstract
Description
Technical Field:
[0001] The utility model relates to the technical field of crane hooks, and more specifically to a lifting mechanism for preventing hook detachment on a crane. Background Art:
[0002] In industrial production, a hook is an important component of a hoisting machine. When handling heavy objects, a crane is an indispensable transportation tool. During the working process of the hook, due to the complex stress conditions, there are certain deficiencies. During the hoisting process, due to shaking, hook detachment accidents often occur, which are likely to cause major personal and equipment accidents and affect production safety. Therefore, existing hooks are all provided with anti-detachment structures. Conventional hooks are provided with a slanted and rotatable retaining piece inside. The retaining piece is elastically pressed against the inner wall of the hook and can be rotated downward to hang the sling inside the hook. However, when the sling inside the hook occupies most of the hook space, the sling will interfere with the downward rotation of the retaining piece, making it inconvenient for the sling to be detached from the hook. Therefore, some hooks are provided with an anti-detachment retaining sleeve based on gravity limit and capable of moving up and down. However, sometimes there is a risk of the anti-detachment retaining sleeve moving up and detaching due to the shaking of the sling. Therefore, for the anti-detachment retaining sleeve, a structure that can effectively limit the position is required. Summary of the Utility Model:
[0003] The purpose of the utility model is to address the deficiencies of the prior art and provide a lifting mechanism for preventing hook detachment on a crane. The hook on the lifting mechanism is provided with an anti-detachment protective cover, and the protective cover is provided with a limiting structure that can effectively prevent the occurrence of hook detachment caused by the upward movement of the protective cover.
[0004] A lifting mechanism for preventing hook detachment on a crane includes a hook on a crane electric hoist. The hook includes a vertical rectangular central column. On both sides of the lower end of the central column, symmetrically formed hooks are provided. Each hook includes a horizontal supporting portion and an inclined hook claw portion. An isosceles trapezoid-shaped protective cover is inserted on the central column, and both sides of the protective cover are located directly above the hooks.
[0005] Vertical rectangular avoidance openings are formed on the inclined side walls of the protective cover near both ends of the protective cover. The hook claw portion of the hook passes through the avoidance openings of the protective cover and abuts against the inner side edges of the avoidance openings. A downward-extending retaining frame is formed on the lower side edge of the protective cover. Longitudinal limiting columns are inserted into the retaining frames on both sides of the hook. Oppositely facing eccentric shafts are formed on both end faces of the limiting columns. The eccentric shaft on the rear side of the limiting column passes through the retaining frame and is inserted and fixed with a limiting sleeve. The eccentric shaft on the front side of the limiting column passes through the retaining frame and is inserted and fixed with a dial block. A torsion spring is inserted on the eccentric shaft. One end of the torsion spring is inserted and fixed on the retaining frame, and the other end is inserted and fixed on the limiting column. The limiting column presses against the outer side wall of the hook claw portion of the hook.
[0006] Preferably, a rectangular guide sleeve is formed on the top of the protective cover, and the guide sleeve is inserted on the central column.
[0007] Preferably, the front and rear end faces of the hook claw part of the hook are both inclined planes, and the width of the outer side wall of the hook claw part is smaller than the width of the side wall of the central column.
[0008] Preferably, a handle is formed on the shifting block, and a stop block is abutted against the lower side wall of the handle. The stop block is fixed on the protective cover.
[0009] Preferably, the limiting column is cylindrical, and the center distance from the central column to the limiting column is smaller than the center distance from the central column to the eccentric shaft.
[0010] Preferably, arc-shaped openings are formed in the middle of the front and rear side frames of the retaining frame.
[0011] Preferably, a circular connecting column is formed at the upper end of the central column. Flat cutting grooves are formed on the two side walls of the connecting column, and the bottom surfaces of the cutting grooves are flush with the two side walls of the central column respectively; A circular bearing sleeve is inserted and fixed in the middle of the connecting column. Support ears are formed on both sides of the bearing sleeve, and triangular rib plates are welded and fixed on the support ears. The rib plates are respectively welded and fixed on the bottom surfaces of the cutting grooves on both sides of the connecting column.
[0012] The beneficial effects of the utility model are as follows:
[0013] The lifting hook on the lifting mechanism of the present utility model is provided with a protective cover for preventing the hook from disengaging. The protective cover is provided with a limiting structure, which can effectively prevent the occurrence of hook disengagement caused by the upward movement of the protective cover. Brief Description of the Drawings:
[0014] Figure 1 is a schematic three-dimensional structure diagram of the present utility model;
[0015] Figure 2 is a schematic cross-sectional structure diagram of the present utility model when viewed from the front;
[0016] Figure 3 is a schematic structure diagram of the present utility model when viewed from below.
[0017] In the figure: 1, central column; 11, hook; 12, connecting column; 13, cutting groove; 2, bearing sleeve; 21, support ear; 3, protective cover; 31, avoidance opening; 32, retaining frame; 33, guide sleeve; 34, opening; 4, limiting column; 41, eccentric shaft; 5, torsion spring; 6, shifting block; 61, handle; 7, limiting sleeve; 8, stop block; 9, rib plate. Detailed Description of the Preferred Embodiments:
[0018] Embodiment: See Figures 1 to 3As shown in the figure, the lifting mechanism for preventing the hook from disengaging on a crane includes a hook on an electric hoist of the crane. The hook includes a central column 1 in the shape of a vertical rectangle. On both sides of the lower end of the central column 1, symmetrically formed hooks 11 are provided. The hook 11 includes a horizontal supporting portion and an inclined hook claw portion. An isosceles trapezoid-shaped protective cover 3 is sleeved on the central column 1, and both sides of the protective cover 3 are located directly above the hook 11.
[0019] On the inclined side walls of the protective cover 3 near both ends, vertically rectangular avoidance openings 31 are formed. The hook claw portion of the hook 11 passes through the avoidance opening 31 of the protective cover 3 and abuts against the inner side edge of the avoidance opening 31. A downward-extending retaining frame 32 is formed on the lower side edge of the protective cover 3. Longitudinal limit posts 4 are inserted into the retaining frames 32 on both sides of the hook. Oppositely formed eccentric shafts 41 are respectively formed on both end faces of the limit post 4. The eccentric shaft 41 at the rear side of the limit post 4 passes through the retaining frame 32 and is sleeved and fixed with a limit sleeve 7. The eccentric shaft 41 at the front side of the limit post 4 passes through the retaining frame 32 and is sleeved and fixedly connected with a dial block 6. A torsion spring 5 is sleeved on the eccentric shaft 41. One end of the torsion spring 5 is inserted and fixed on the retaining frame 32, and the other end is inserted and fixed on the limit post 4. The limit post 4 presses against the outer side wall of the hook claw portion of the hook 11.
[0020] A rectangular guide sleeve 33 is formed on the top of the protective cover 3. The guide sleeve 33 is sleeved on the central column 1. A perforation opposite to the central column 1 is formed on the top of the protective cover 3, and the perforation is located within the guide sleeve 33.
[0021] The front and rear end faces of the hook claw portion of the hook 11 are both inclined planes, and the width of the outer side wall of the hook claw portion is smaller than the width of the side wall of the central column 1, that is, the hook claw portion gradually narrows from the supporting portion to the outside.
[0022] A handle 61 is formed on the dial block 6. A stop block 8 abuts against the lower side wall of the handle 61, and the stop block 8 is fixed on the protective cover 3.
[0023] The limit post 4 is cylindrical. The center distance from the central column 1 to the limit post 4 is smaller than the center distance from the central column 1 to the eccentric shaft 41. At this time, it is in the locked state. As Figure 2 shown, when the eccentric shaft 41 is rotated, the limit post 4 can be moved to the outside of the hook 11, and the protective cover 3 can be disengaged from the hook 11.
[0024] Arc-shaped openings 34 are formed in the middle of the front and rear side frames of the retaining frame 32.
[0025] A circular connecting column 12 is formed at the upper end of the central column 1. Flat cutting grooves 13 are formed on both side walls of the connecting column 12, and the bottom surfaces of the cutting grooves 13 are flush with the two side walls of the central column 1 respectively. A circular bearing sleeve 2 is inserted and fixed in the middle of the connecting column 12. Support ears 21 are formed on both sides of the bearing sleeve 2. Triangular rib plates 9 are welded and fixed on the support ears 21, and the rib plates 9 are respectively welded and fixed on the bottom surfaces of the cutting grooves 13 on both sides of the connecting column 12.
[0026] Working principle: This structure is a lifting mechanism for preventing the hook from disengaging on a crane. Its lifting mechanism is the structure of the hook part. The hook uses a protective sleeve 3 that moves up and down to block the entrance of the hook. In order to prevent the protective sleeve 3 from moving up, a limiting structure of a limiting column 4 and an eccentric shaft 41 is added. By rotating the dial 6, the limiting column 4 can be moved to the outside of the avoidance opening 31, and its hook 11 can be inserted into the avoidance opening 31. Then, release the dial 6. Under the action of the torsion spring 5, the limiting column 4 rotates and presses against the hook 11, further restricting the protective sleeve 3 from disengaging from the hook in addition to using the gravity of the protective sleeve 3, thereby avoiding the occurrence of hook disengagement during lifting.
[0027] The described embodiments are used to illustrate the present invention by way of example, rather than to limit the present invention. Any person skilled in the art can modify the described embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of the rights protection of the present invention should be as listed in the claims of the present invention.
Claims
1. A lifting mechanism for preventing unhooking on a crane, comprising a hook on an electric hoist of the crane, the hook comprising a vertical rectangular central column (1), symmetrical hooks (11) are respectively formed on both sides of the lower end of the central column (1), the hook (11) comprising a horizontal supporting portion and an inclined hook claw portion, characterized in that: An isosceles trapezoidal protective cover (3) is inserted and sleeved on the central column (1), and two sides of the protective cover (3) are located directly above the hook (11); A vertical rectangular avoidance opening (31) is formed on the oblique side wall of the protective cover (3) near the two ends of the protective cover (3), and the hook claw of the hook (11) passes through the avoidance opening (31) of the protective cover (3) and abuts against the inner side of the avoidance opening (31); a downward extending stop frame (32) is formed on the lower side of the protective cover (3), and longitudinal limit columns (4) are inserted into the stop frames (32) on both sides of the hook, and opposite eccentric shafts are respectively formed on the two end surfaces of the limit columns (4). (41), the eccentric shaft (41) on the rear side of the limiting column (4) passes through the stop frame (32) sleeve and is fixed to the limiting sleeve (7), and the eccentric shaft (41) on the front side of the limiting column (4) passes through the stop frame (32) sleeve and is fixed to the shift block (6); a torsion spring (5) is sleeved on the eccentric shaft (41), one end of the torsion spring (5) is plugged and fixed on the stop frame (32), and the other end is plugged and fixed on the limiting column (4), and the limiting column (4) is pressed against the outer wall of the hook claw part on the hook (11).
2. The anti-unhooking hoisting mechanism on the crane according to claim 1, characterized in that: A rectangular guide sleeve (33) is formed on the top of the protective cover (3), and the guide sleeve (33) is inserted into the central column (1).
3. The anti-unhooking hoisting mechanism on the crane according to claim 2, characterized in that: The front and rear end surfaces of the hook portion on the hook (11) are both inclined, and the width of the outer side wall of the hook portion is smaller than the width of the side wall of the center column (1).
4. The anti-unhooking hoisting mechanism on a crane according to claim 1, characterized in that: A handle (61) is formed on the shifting block (6), a stopper (8) is abutted against the lower side wall of the handle (61), and the stopper (8) is fixed on the protective cover (3).
5. The anti-unhooking hoisting mechanism on a crane according to claim 1, characterized in that: The limiting column (4) is cylindrical, and the center distance between the central column (1) and the limiting column (4) is smaller than the center distance between the central column (1) and the eccentric shaft (41).
6. The anti-unhooking hoisting mechanism on a crane according to claim 1, characterized in that: The middle parts of the front and rear side frames of the baffle frame (32) are formed with arc-shaped openings (34).
7. The anti-unhooking hoisting mechanism on a crane according to claim 1, characterized in that: A circular connecting column (12) is formed at the upper end of the central column (1), and two side walls of the connecting column (12) are formed with planar grooves (13), and the bottom surfaces of the grooves (13) are respectively flush with the two side walls of the central column (1); a circular bearing sleeve (2) is fixed to the middle plug sleeve of the connecting column (12), and two sides of the bearing sleeve (2) are formed with supporting ears (21), and triangular rib plates (9) are welded and fixed to the supporting ears (21), and the rib plates (9) are respectively welded and fixed to the bottom surfaces of the grooves (13) on both sides of the connecting column (12).