A crane hook with a limiting device

Abstract

The utility model discloses a crane hook with limiting device belongs to crane hook technical field, including main hook and two auxiliary hooks, the top fixedly connected with hook rod of main hook, the outside fixed sleeve of hook rod is connected with connecting seat, the both ends of connecting seat all are fixedly connected with protection box, the top all of protection box are installed with outer thread box cover, the top of auxiliary hook all is provided with telescopic cylinder, and the top of two telescopic cylinders all movably sleeve to the inner chamber of protection box and is installed with the cover of resistance, in the utility model, through setting up protection box on the outside of hook rod in main hook top, and make telescopic cylinder's top, the cover of resistance and spring place in the inner chamber of protection box, and install outer thread box cover on the top of protection box, through outer thread box cover and protection box to the protection of the cover of resistance, spring etc.

Description

Technical Field

[0001] This utility model relates to the field of crane hook technology, and more specifically, to a crane hook with a limiting device. Background Technology

[0002] A crane is a multi-action lifting machine that vertically lifts and horizontally moves heavy objects within a certain range. It is also called an overhead crane, gantry crane, or hoist. The hook is the structure on the crane used to hang goods.

[0003] A search revealed that utility model patent CN220976289U discloses an anti-detachment device for a crane hook, including a hook, an anti-detachment plate, a connecting assembly, and a triggering assembly. The anti-detachment plate has a rotating shaft, and a first gear is fixedly connected to one side of the anti-detachment plate. By incorporating the anti-detachment plate, connecting assembly, and triggering assembly, during use, the weight of the hoisted item triggers the anti-detachment plate to rotate and block the hook opening, limiting its movement and preventing the sling or wire rope from swaying and knocking the anti-detachment plate off the hook opening. This prevents the sling or wire rope from detaching due to inertial swaying, improving safety. After unloading, once the object lands, the hook and triggering hook are no longer subjected to the weight of the object, and the anti-detachment plate rotates upwards to reset, exposing the hook opening for easy removal of the sling or wire rope from the hook.

[0004] However, the aforementioned patents have the following shortcomings: the springs and other structures are located externally, making them susceptible to impacts from external ropes and cables, which affects their service life; furthermore, repeated use of the springs can lead to failure, making replacement inconvenient. Therefore, we propose a crane hook with a limiting device. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a crane hook with a limiting device.

[0006] To solve the above problems, the present invention adopts the following technical solution: a crane hook with a limiting device, comprising a main hook and two auxiliary hooks. A hook rod is fixedly connected to the top of the main hook, and a connecting seat is fixedly sleeved on the outer side of the hook rod. Protective boxes are fixedly connected to both ends of the connecting seat. External threaded box covers are threaded onto the top of each protective box. Telescopic cylinders are provided at the top of each auxiliary hook. The tops of the two telescopic cylinders are movably sleeved into the inner cavity of the protective box and fitted with a stop cover. A spring is sleeved between the bottom surface of the stop cover and the bottom surface of the inner cavity of the protective box. Transmission grooves are provided on the inner sides of the two auxiliary hooks. Gear teeth are provided on the inner walls of the two transmission grooves. A rotating rod is rotatably connected to the hook rod. An anti-detachment plate is fixedly sleeved on the rotating rod. Both ends of the rotating rod extend into the inner cavities of the two transmission grooves and are fixedly sleeved with spur gears. The two spur gears mesh with the two gear teeth respectively.

[0007] As a preferred embodiment of this utility model, the top surface of the telescopic cylinder is provided with an internal threaded hole, the bottom surface of the cover is fixedly connected with an external threaded column, the bottom end of the external threaded column is threaded into the inner cavity of the internal threaded hole, and the top surface of the cover is provided with a second cross groove.

[0008] As a preferred embodiment of this utility model, a connecting ring is fixedly connected to the top end of the hook rod.

[0009] As a preferred embodiment of this utility model, the top surface of the external threaded box cover is provided with a first cross groove.

[0010] In a preferred embodiment of this utility model, the side of the cover fits against the inner wall of the protective box.

[0011] In a preferred embodiment of this utility model, the main hook and the auxiliary hook have the same inner diameter.

[0012] Compared with the prior art, the advantages of this utility model are: (1) In this utility model, a protective box is fitted on the outside of the hook rod at the top of the main hook, and the top of the telescopic cylinder, the cover and the spring are placed in the inner cavity of the protective box. An external threaded box cover is installed on the top of the protective box. The external threaded box cover and the protective box protect the cover, spring and other structures, and prevent them from being damaged by the impact of external ropes and cables.

[0013] (2) In this utility model, when the spring fails to spring, the external threaded cover is removed from the protective box by using a cross screwdriver and the first cross groove, and the cover is removed from the telescopic cylinder by using a cross screwdriver and the second cross groove, so that the spring fitted on the telescopic cylinder can be removed and replaced. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 is an exploded view of the overall structure of this utility model.

[0016] Figure 3 is a schematic cross-sectional view of the present invention.

[0017] Figure 4 is a schematic diagram of the main hook of this utility model.

[0018] Figure 5 is a schematic diagram of the auxiliary hook of this utility model.

[0019] The following are the labels in the diagram: 1. Main hook; 2. Auxiliary hook; 3. Hook rod; 4. Connecting seat; 5. Protective box; 6. External threaded box cover; 7. Rotating rod; 8. Anti-detachment plate; 9. Spur gear; 10. Transmission groove; 11. Gear tooth plate; 12. Telescopic cylinder; 13. Abutment cover; 14. Spring; 15. Internal threaded hole; 16. External threaded post; 17. Second cross groove; 18. First cross groove; 19. Connecting ring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," 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 do not 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1

[0023] Please refer to Figures 1-5. A crane hook with a limiting device includes a main hook 1 and two auxiliary hooks 2. A hook rod 3 is fixedly connected to the top of the main hook 1. A connecting seat 4 is fixedly sleeved on the outer side of the hook rod 3. Protective boxes 5 are fixedly connected to both ends of the connecting seat 4. External threaded covers 6 are threaded onto the top of each protective box 5. Telescopic cylinders 12 are provided at the top of each of the auxiliary hooks 2. The tops of the two telescopic cylinders 12 are movably sleeved into the inner cavity of the protective box 5 and fitted with a stop cover 13. A spring 14 is sleeved between the bottom surface of the stop cover 13 and the bottom surface of the inner cavity of the protective box 5. Transmission grooves 10 are provided on the inner sides of the two auxiliary hooks 2. Gear tooth plates 11 are provided on the inner walls of the two transmission grooves 10. A rotating rod 7 is rotatably connected to the hook rod 3. An anti-detachment plate 8 is fixedly sleeved on the rotating rod 7. The two ends of the rotating rod 7 extend to the two transmission grooves 10 respectively. The inner cavity is fitted with spur gears 9, and the two spur gears 9 mesh with the two gear plates 11 respectively.

[0024] In this embodiment, the spring 14 is fitted on the outer side of the top of the telescopic cylinder 12, the bottom end of the spring 14 abuts against the bottom surface of the inner cavity of the protective box 5, and the top end of the spring 14 abuts against the bottom surface of the cover 13.

[0025] Specifically, please refer to Figures 2 to 5. The top surface of the telescopic cylinder 12 is provided with an internal threaded hole 15, and the bottom surface of the cover 13 is fixedly connected with an external threaded post 16. The bottom end of the external threaded post 16 is threaded into the inner cavity of the internal threaded hole 15, and the top surface of the cover 13 is provided with a second cross groove 17.

[0026] In this embodiment, the cover 13 can be removed by the cooperation of the internal threaded hole 15 and the external threaded post 16, so that the spring 14 can be taken out and replaced.

[0027] Specifically, please refer to Figure 1. A connecting ring 19 is fixedly connected to the top of the hook rod 3.

[0028] In this embodiment, the connecting ring 19 is connected to the rope on the crane so that the crane can drive the hook to carry out the lifting work.

[0029] Specifically, please refer to Figure 2. The top surface of the external threaded box cover 6 is provided with a first cross groove 18.

[0030] In this embodiment, the first Phillips head slot 18 and a Phillips head screwdriver are used to disassemble the externally threaded cover 6 in order to replace the spring 14.

[0031] Specifically, please refer to Figures 2 and 3, where the side of the cover 13 fits into the inner wall of the protective box 5.

[0032] In this embodiment, the stability of the cover 13 in moving up and down within the protective box 5 is ensured.

[0033] Specifically, please refer to Figure 1. The inner diameters of the main hook 1 and the auxiliary hook 2 are the same.

[0034] In this embodiment, it is ensured that the main hook 1 and the auxiliary hook 2 can successfully hook the rope.

[0035] Working Principle: In operation, the hoisting cable is first looped inside the main hook 1 and the two auxiliary hooks 2. At this point, the anti-detachment plate 8 is in an upward-opening state. Then, as the crane moves the main hook 1 and auxiliary hooks 2 upward, the cable squeezes the auxiliary hooks 2 downward, making them concentric with the main hook 1. During the downward movement of the auxiliary hooks 2, the gear plate 11 moves downward. The meshing transmission between the gear plate 11 and the spur gear 9 drives the rotating rod 7 and the anti-detachment plate 8 to rotate downward, sealing the opening of the main hook 1 and preventing the cable from detaching. Simultaneously, as the auxiliary hooks 2 move downward, the telescopic cylinder 12 and the cover 13 move downward, compressing the spring 14. Then, when the hoisting is no longer in operation, the cable no longer squeezes the auxiliary hooks 2. The elastic force of the spring 14 drives the cover 13, telescopic cylinder 12, and auxiliary hooks 2 upward. The auxiliary hooks 2 then drive the gear plate 11 upward, using the gear plate 11... The meshing transmission between the spur gear 9 and the anti-detachment plate 8 causes it to flip upwards, making it easier for the rope to be removed from the main hook 1 and the auxiliary hook 2. Finally, the protective box 5 and the external threaded cover 6 protect the cover 13, the telescopic cylinder 12, the spring 14, and other structures. In addition, when the spring 14 fails to maintain its elasticity, the external threaded cover 6 can be removed from the protective box 5 with a Phillips screwdriver, the cover 13 can be removed from the telescopic cylinder 12, and the spring 14 fitted on the telescopic cylinder 12 can be removed and replaced.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. A crane hook with a limiting device, characterized in that: Includes a main hook (1) and two auxiliary hooks (2). The top of the main hook (1) is fixedly connected to a hook rod (3). A connecting seat (4) is fixedly sleeved on the outside of the hook rod (3). Both ends of the connecting seat (4) are fixedly connected to protective boxes (5). The top of each protective box (5) is threaded with an external threaded cover (6). The top of each auxiliary hook (2) is provided with a telescopic cylinder (12). The tops of the two telescopic cylinders (12) are movably sleeved into the inner cavity of the protective box (5) and are fitted with a stop cover (13). The stop cover (13) has... A spring (14) is sleeved between the bottom surface and the bottom surface of the inner cavity of the protective box (5). The inner sides of the two auxiliary hooks (2) are provided with transmission grooves (10). The inner walls of the two transmission grooves (10) are provided with gear plates (11). A rotating rod (7) is rotatably connected to the hook rod (3). An anti-detachment plate (8) is fixedly sleeved on the rotating rod (7). The two ends of the rotating rod (7) extend to the inner cavities of the two transmission grooves (10) and are fixedly sleeved with spur gears (9). The two spur gears (9) mesh with the two gear plates (11) respectively.

2. A crane hook with a limiting device according to claim 1, characterized in that: The top surface of the telescopic cylinder (12) is provided with an internal threaded hole (15), and the bottom surface of the cover (13) is fixedly connected with an external threaded column (16). The bottom end of the external threaded column (16) is threaded into the inner cavity of the internal threaded hole (15), and the top surface of the cover (13) is provided with a second cross groove (17).

3. A crane hook with a limiting device according to claim 1, characterized in that: The top end of the hook rod (3) is fixedly connected to a connecting ring (19).

4. A crane hook with a limiting device according to claim 1, characterized in that: The top surface of the external threaded box cover (6) is provided with a first cross groove (18).

5. A crane hook with a limiting device according to claim 1, characterized in that: The side of the cover (13) fits against the inner wall of the protective box (5).

6. A crane hook with a limiting device according to claim 1, characterized in that: The main hook (1) and the auxiliary hook (2) have the same inner diameter.

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