Lifting limiting device of crane sling
By designing a crane spreader lifting limit device that combines guide rods, pulleys and springs, the problem of collision between the spreader and the crane trolley is solved, and effective limit buffering and equipment safety protection is achieved.
Patent Information
- Application Number
- CN202520898496.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-08
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2035-05-08
AI Technical Summary
The existing crane lifting limit devices and crane trolleys are prone to collision, resulting in damage to the equipment and affecting the safety of use.
A lifting limiting device including a main beam, a lifting trolley, a reel, a wire rope and a spreader is designed. Through the combination of the first guide rod, the second guide rod, the pulley, the spring, and the fixed pulley, the compression and tensile effect of the spring is used to realize the limiting buffering of the spreader.
It effectively avoids the spreader from rushing upward to the lifting car, achieves good limit buffering effect, protects the equipment safely, has a clever structure, and is durable.
Smart Images
Figure CN222961018U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of cranes, and particularly relates to a lifting limit device for a crane spreader. Background Art
[0002] A crane refers to a lifting machine that vertically lifts and horizontally transports heavy objects within a certain range, also known as an overhead crane, gantry crane or hoist. A crane spreader can effectively reduce the handling intensity. The existing lifting limit device moves up and down with the spreader. The lifting limit device is prone to collide with the hoisting trolley, damaging the equipment and affecting the use safety of the equipment. Summary of the Utility Model
[0003] In view of the above situation, to overcome the deficiencies of the prior art, the purpose of the present utility model is to provide a lifting limit device for a crane spreader, effectively solving the problem of easy damage to the equipment.
[0004] The technical solution for solving the technical problem is: it includes a main beam, a hoisting trolley, a drum, a steel wire rope and a spreader. A bracket is fixed at the lower end of the hoisting trolley. A first guide rod and a second guide rod are slidably connected up and down inside the bracket. The upper end of the first guide rod is rotatably connected to a first pulley, and the upper end of the second guide rod is rotatably connected to a second pulley. The lower ends of the first guide rod and the second guide rod are coaxially fixed with a first chassis. A first spring is installed between the first chassis and the bracket. A second spring in the horizontal direction is installed on the left side of the bracket. The right end of the second spring is fixedly connected to a rope. A first fixed pulley is installed on the bracket between the second spring and the first pulley.
[0005] A cavity is provided inside the bracket. A support plate is fixed on the bracket inside the cavity. A third guide rod is slidably connected up and down inside the support plate. The upper end of the third guide rod is rotatably connected to a third pulley. The third pulley is located between the first pulley and the second pulley. The lower end of the third guide rod is coaxially fixed with a second chassis. A third spring is installed between the support plate and the second chassis.
[0006] A fourth spring in the horizontal direction is installed on the right side of the bracket. A second fixed pulley is installed on the bracket between the fourth spring and the second pulley. The rope sequentially passes through the first fixed pulley, the first pulley, the third pulley, the second pulley, the second fixed pulley, and the other end of the rope is fixedly connected to the left end of the fourth spring.
[0007] Preferably, the first pulley and the second pulley are at the same height, and the height of the third pulley is lower than the height of the first pulley.
[0008] Preferably, a limit block corresponding to the first chassis up and down is fixed at the upper end of the spreader.
[0009] Preferably, limit discs are fixed on both the first guide rod and the second guide rod above the bracket.
[0010] The utility model has the following advantages compared with traditional equipment: during the lifting process of the crane sling, the limit block squeezes the first chassis upwards, the first pulley and the second pulley move upwards, the rope moves upwards, the second spring and the fourth spring are stretched simultaneously, and the first spring and the third spring are compressed. Under the combined action of the first spring, the second spring, the third spring and the fourth spring, effective limit buffering can be carried out on the sling, avoiding the sling from colliding with the hoisting trolley upwards, with good buffering effect, ingenious structure, durability, safety and stability. Description of the Drawings
[0011] Figure 1 is a schematic diagram of the front view of the utility model;
[0012] Figure 2 is Figure 1 a schematic diagram of the partial enlargement of A in
[0013] Figure 3 is Figure 2 a schematic diagram of the three-dimensional structure.
[0014] Reference numerals: 1, main beam; 2, hoisting trolley; 3, sling; 4, bracket; 5, first guide rod; 6, second guide rod; 7, first pulley; 8, second pulley; 9, first chassis; 10, first spring; 11, second spring; 12, rope; 13, first fixed pulley; 14, cavity; 15, support plate; 16, third pulley; 17, second chassis; 18, fourth spring; 19, second fixed pulley; 20, limit block; 21, limit plate. Detailed Description of the Invention
[0015] The following further details the specific embodiments of the utility model with reference to the drawings.
[0016] Provided by Figures 1 to 3 is a lifting limit device for a crane sling, including a main beam 1, a hoisting trolley 2, a drum, a steel wire rope and a sling 3. A bracket 4 is fixed at the lower end of the hoisting trolley 2. A first guide rod 5 and a second guide rod 6 are slidably connected up and down inside the bracket 4. The upper end of the first guide rod 5 is rotatably connected with a first pulley 7, and the upper end of the second guide rod 6 is rotatably connected with a second pulley 8. The lower ends of the first guide rod 5 and the second guide rod 6 are coaxially fixed with a first chassis 9. A first spring 10 is installed between the first chassis 9 and the bracket 4. A horizontal second spring 11 is installed on the left side of the bracket 4. The right end of the second spring 11 is fixedly connected with a rope 12. A first fixed pulley 13 is installed on the bracket 4 between the second spring 11 and the first pulley 7;
[0017] The support 4 is provided with a cavity 14. A support plate 15 located inside the cavity 14 is fixed on the support 4. A third guide rod is slidably connected up and down inside the support plate 15. The upper end of the third guide rod is rotatably connected with a third pulley 16. The third pulley 16 is located between the first pulley 7 and the second pulley 8. The lower end of the third guide rod is coaxially fixed with a second chassis 17. A third spring is installed between the support plate 15 and the second chassis 17.
[0018] A horizontal fourth spring 18 is installed on the right side of the support 4. A second fixed pulley 19 located between the fourth spring 18 and the second pulley 8 is installed on the support 4. The rope 12 sequentially passes through the first fixed pulley 13, the first pulley 7, the third pulley 16, the second pulley 8, and the second fixed pulley 19. The other end of the rope 12 is fixedly connected to the left end of the fourth spring 18.
[0019] The first pulley 7 and the second pulley 8 are at the same height, and the height of the third pulley 16 is lower than the height of the first pulley 7.
[0020] A limit block 20 corresponding to the first chassis 9 up and down is fixed to the upper end of the sling 3.
[0021] In order to prevent the first guide rod 5 and the second guide rod 6 from slipping out of the support 4, limit discs 21 located above the support 4 are fixed on both the first guide rod 5 and the second guide rod 6.
[0022] When the present utility model is in use, start the crane. During the lifting process of the sling 3, the sling 3 drives the limit block 20 to move upward. When the limit block 20 presses the first chassis 9 upward, the first chassis 9 moves upward. The first guide rod 5 and the second guide rod 6 both move upward inside the support 4. The first spring 10 is in a compressed state. The first pulley 7 and the second pulley 8 move upward simultaneously. The rope 12 moves upward. The left side of the rope 12 pulls the second spring 11 to move rightward under the action of the first fixed pulley 13. The second spring 11 is in a stretched state. The right side of the rope 12 pulls the fourth spring 18 to slide leftward under the action of the second fixed pulley 19. The fourth spring 18 is in a stretched state. The first fixed pulley 13 and the second fixed pulley 19 can ensure the stability of the horizontal movement of the second spring 11 and the fourth spring 18.
[0023] The height of the third pulley 16 is lower than the height of the first pulley 7. The rope 12 drives the third pulley 16 to move upward. The third pulley 16 drives the third guide rod to slide upward inside the support plate 15. The second chassis 17 moves upward. The third spring is in a compressed state. Under the combined action of the first spring 10, the second spring 11, the third spring, and the fourth spring 18, the impact of the limit block 20 on the first chassis 9 is effectively alleviated, and the sling 3 is effectively prevented from colliding upward with the hoisting trolley 2, achieving a good limit buffering effect and protecting the safety of the equipment.
[0024] This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the present utility model. Any simple modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present utility model all fall within the protection scope of the technical solution of the present utility model.
Claims
1. A lifting limit device for a crane sling, comprising a main beam (1), a lifting trolley (2), a drum, a wire rope and a sling (3), characterized in that: A bracket (4) is fixed at the lower end of the lifting trolley (2), a first guide rod (5) and a second guide rod (6) are slidably connected in the bracket (4) up and down, the upper end of the first guide rod (5) is rotatably connected to a first pulley (7), the upper end of the second guide rod (6) is rotatably connected to a second pulley (8), the lower end of the first guide rod (5) and the lower end of the second guide rod (6) are coaxially fixed with a first chassis (9), a first spring (10) is installed between the first chassis (9) and the bracket (4), a second spring (11) in the horizontal direction is installed on the left side of the bracket (4), the right end of the second spring (11) is fixedly connected to a rope (12), and a first fixed pulley (13) located between the second spring (11) and the first pulley (7) is installed on the bracket (4); A cavity (14) is provided in the bracket (4), a support plate (15) located in the cavity (14) is fixed on the bracket (4), a third guide rod is slidably connected to the support plate (15) up and down, a third pulley (16) is rotatably connected to the upper end of the third guide rod, the third pulley (16) is located between the first pulley (7) and the second pulley (8), a second chassis (17) is coaxially fixed to the lower end of the third guide rod, and a third spring is installed between the support plate (15) and the second chassis (17); A fourth spring (18) is installed in a horizontal direction on the right side of the bracket (4); a second fixed pulley (19) is installed on the bracket (4) and is located between the fourth spring (18) and the second pulley (8); the rope (12) passes through the first fixed pulley (13), the first pulley (7), the third pulley (16), the second pulley (8), and the second fixed pulley (19) in sequence; and the other end of the rope (12) is fixedly connected to the left end of the fourth spring (18).
2. A lifting limit device for a crane spreader according to claim 1, characterized in that: The first pulley (7) and the second pulley (8) are at the same height, and the height of the third pulley (16) is lower than that of the first pulley (7).
3. The lifting limit device of a crane spreader according to claim 1, characterized in that: A limit block (20) corresponding to the upper and lower parts of the first chassis (9) is fixed to the upper end of the sling (3).
4. The lifting limit device of a crane spreader according to claim 1, characterized in that: A limiting plate (21) located above the bracket (4) is fixed on both the first guide rod (5) and the second guide rod (6).