A lifting device to prevent hook detachment

Abstract

This utility model provides a lifting device to prevent disengagement, including a rotating hook assembly and a locking mechanism. The rotating hook assembly, from top to bottom, includes a lifting ring, a rotating mechanism, a connecting pin, and a hook. The locking mechanism includes an arc-shaped blind hole with a total central angle of 180° inside the hook. A coaxial arc-shaped hole communicating with the arc-shaped blind hole is provided on the side wall of the hook. The arc-shaped trajectory of the arc-shaped blind hole crosses the hook opening of the hook. An arc-shaped slide rod is slidably disposed inside the arc-shaped blind hole. The arc-shaped slide rod has a through hole with internal threads, and a groove with internal threads is provided on the inner side of the arc-shaped blind hole. A screw is threadedly connected to the through hole. Through the technical solution of this utility model, by setting an arc-shaped blind hole with a specific angle distribution and a slidable arc-shaped slide rod structure, and cooperating with the threaded screw, mechanical locking is achieved, solving the problem of easy failure of traditional spring mechanisms. It has the advantages of high structural reliability, adaptability to harsh working conditions, and providing a clear mechanical locking state.

Description

Technical Field

[0001] This utility model relates to the field of lifting and hoisting equipment technology, and more specifically, to a hoisting lifting device to prevent detachment. Background Technology

[0002] Traditional anti-disengagement devices for lifting hooks mostly employ automatic or semi-automatic safety latch structures with springs. These devices have revealed several shortcomings in practical applications: First, the spring element is prone to metal fatigue after long-term reciprocating motion, especially under high-frequency use conditions, where the spring's elasticity gradually deteriorates. Second, in harsh environments such as construction sites and port loading / unloading areas, the spring mechanism is susceptible to dust and mud intrusion, leading to jamming. Third, in extremely cold regions, the spring material becomes brittle due to low temperatures, reducing reliability. More seriously, when the spring fails, the safety latch may be in an unpredictable state, failing to ensure reliable locking and potentially obstructing the normal opening and closing of the hook, creating new safety hazards. Furthermore, in certain high-safety-requirement operations, such as nuclear power equipment hoisting and precision equipment handling, operators often require more intuitive and controllable mechanical locking methods, rather than relying on the unpredictability of automatic mechanisms. Current technology lacks an anti-disengagement solution that can adapt to harsh working conditions while providing a clear locking state. Utility Model Content

[0003] To overcome the shortcomings of existing technology, this utility model provides a lifting device to prevent unhooking.

[0004] This utility model is achieved through the following technical solution: a lifting device for preventing hook detachment, comprising a rotating hook assembly and a locking mechanism. The rotating hook assembly comprises, from top to bottom, a lifting ring, a rotating mechanism, a connecting pin, and a hook. A connecting base is fixedly connected to the top of the hook. The top of the connecting base is rotatably nested into the rotating mechanism via the connecting pin. A cylindrical threaded shaft is vertically installed on the top of the rotating mechanism. The bottom of the lifting ring is threadedly connected to the cylindrical threaded shaft and secured with a hexagonal nut.

[0005] The locking mechanism includes an arc-shaped blind hole with a total central angle of 180° inside the hook. A coaxial arc hole communicating with the arc-shaped blind hole is formed on the side wall of the hook. The center of curvature of the coaxial arc hole coincides with the center of curvature of the arc-shaped blind hole, and the total central angle of the coaxial arc hole is also 180°. The arc-shaped trajectory of the blind hole crosses the hook opening. The blind hole is divided into two segments: segment A, with its center of curvature, is located at the upper part of the hook opening, and segment B is located at the lower part of the hook opening. The central angle α corresponding to segment A at the upper part is smaller than the central angle β corresponding to segment B at the lower part. The sum of central angle α and central angle β is 180°, and central angle β is 12°. 0°, central angle α is 60°; inside the arc-shaped section B of the arc-shaped blind hole, an arc-shaped sliding rod with a central angle of 120° is slidably installed. The arc-shaped sliding rod has a first through hole and a second through hole with internal threads. The central angle between the first through hole and the second through hole is 90°. The inner side of the arc-shaped blind hole has a first groove, a second groove and a third groove with internal threads. The first groove is located in the arc-shaped section A of the arc-shaped blind hole, and the second groove and the third groove are located in the arc-shaped section B of the arc-shaped blind hole. The central angle between the first groove and the second groove, and between the second groove and the third groove, is 90°. The first through hole and the second through hole are respectively connected by threads to a first screw and a second screw.

[0006] As a preferred embodiment, the outer ends of the first screw and the second screw are provided with handles.

[0007] As a preferred option, the lifting ring is a U-shaped lifting ring.

[0008] The present invention, by adopting the above technical solutions, has the following beneficial effects compared with the prior art: The lifting device and its locking mechanism provided in this application, by setting arc-shaped blind holes with specific angle distribution and sliding arc-shaped slide rod structure, and cooperating with threaded screw rod to achieve mechanical locking, solves the problem of easy failure of traditional spring mechanism, and has the advantages of high structural reliability, adaptability to harsh working conditions, and providing a clear mechanical locking state.

[0009] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention. Attached Figure Description

[0010] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0012] Figure 2 A three-dimensional structural diagram showing the removal of the curved slide bar and screw;

[0013] Figure 3 A three-dimensional structural diagram of the arc-shaped slide bar and the screw;

[0014] Figure 4 This is a three-dimensional structural diagram of the present invention in its closed state;

[0015] Figure 5 for Figure 1 A cross-sectional view of the AA surface;

[0016] in, Figures 1 to 5 The correspondence between the reference numerals and components in the attached drawings is as follows:

[0017] 1. Lifting ring, 2. Rotating mechanism, 3. Connecting pin, 4. Lifting hook, 5. Connecting base, 6. Cylindrical threaded shaft, 7. Hexagonal nut, 8. Arc-shaped blind hole, 9. Coaxial arc hole, 10. Lifting hook opening, 11. Arc-shaped slide bar, 12. First through hole, 13. Second through hole, 14. First groove, 15. Second groove, 16. Third groove, 17. First screw, 18. Second screw. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0020] The following is combined Figures 1 to 3 The anti-detachment device for lifting equipment according to embodiments of this utility model will be described in detail.

[0021] Traditional anti-disengagement devices for lifting hooks mostly use automatic or semi-automatic safety latches with springs. Spring mechanisms are susceptible to fatigue failure, especially in dusty, muddy, or low-temperature environments, where spring performance degradation can lead to malfunctions in the locking function. In some work situations, manual confirmation of the locking status is required, but existing automatic mechanisms cannot meet this need. To address the risk of spring failure, a mechanical locking method without elastic elements is considered; to address reliability issues under harsh working conditions, a manually operable locking mechanism is designed; and to address the need for manual confirmation, a locking device with clear position indication is developed. A combination of an arc-shaped sliding rod and threaded fixing achieves both visual operation of the locking status and mechanical fixation. Figure 1 , Figure 2As shown, this utility model proposes a lifting device to prevent disengagement, including a rotating hook assembly and a locking mechanism. The rotating hook assembly includes, from top to bottom, a lifting ring 1, a rotating mechanism 2, a connecting pin 3, and a hook 4. The lifting ring 1 is a U-shaped lifting ring. A connecting base 5 is fixedly connected to the top of the hook 4. The top of the connecting base 5 is rotatably connected to the rotating mechanism 2 via the connecting pin 3. A cylindrical threaded shaft 6 is vertically installed on the top of the rotating mechanism 2. The bottom of the lifting ring 1 is threadedly connected to the cylindrical threaded shaft 6 and fastened by a hexagonal nut 7.

[0022] The locking mechanism includes an arc-shaped blind hole 8 with a total central angle of 180° inside the hook 4. A coaxial arc-shaped hole 9 connected to the arc-shaped blind hole 8 is provided on the side wall of the hook 4. The center of curvature of the coaxial arc-shaped hole 9 coincides with the center of curvature of the arc-shaped blind hole 8. The total central angle of the coaxial arc-shaped hole 9 is also 180°. The arc-shaped trajectory of the arc-shaped blind hole 8 crosses the hook opening 10 of the hook 4. The arc-shaped blind hole 8 is divided into two segments: segment A, with its center of curvature, is located at the upper part of the hook opening 10, and segment B is located at the lower part of the hook opening 10. The central angle α corresponding to the upper segment A is smaller than the central angle β corresponding to the lower segment B. The sum of central angle α and central angle β is 180°, central angle β is 120°, and central angle α is 60°. Inside the arc-shaped section B of the blind hole 8, there is a sliding arc-shaped slide rod 11 with a central angle of 120°. The arc-shaped slide rod 11 has a first through hole 12 and a second through hole 13 with internal threads. The central angle between the first through hole 12 and the second through hole 13 is 90°. Inside the arc-shaped blind hole 8, there are a first groove 14, a second groove 15 and a third groove 16 with internal threads. The first groove 14 is located in the arc-shaped section A of the arc-shaped blind hole 8, and the second groove 15 and the third groove 16 are located in the arc-shaped section B of the arc-shaped blind hole 8. The central angles between the first groove 14 and the second groove 15, and between the second groove 15 and the third groove 16 are both 90°. The first through hole 12 and the second through hole 13 are respectively connected by threads to a first screw 17 and a second screw 18.

[0023] An arc-shaped blind hole refers to a curved cavity extending along the hook body. Specifically, it can be CNC machined to form a 180° arc trajectory, used to guide the slide rod along a predetermined path. A coaxial arc hole refers to a sidewall channel sharing the same center of curvature as the blind hole. Specifically, it can be designed as an arc-shaped through-hole penetrating the hook's sidewall, facilitating observation of the slide rod's position and adjustment of the slide rod's position for screw movement. An arc-shaped slide rod refers to an arc-shaped metal rod matching the blind hole. Specifically, it can adopt an arc structure with a 120° central angle, its length covering the locking range of the hook's opening area. The first and second through holes refer to threaded holes on the slide rod, specifically arranged at 90° intervals, used to install the locking screw. The first to third grooves refer to the threaded positioning points on the inner wall of the blind hole, specifically distributed at 90° intervals, forming two locking positions.

[0024] Handles 19 are provided at the outer ends of the first screw 17 and the second screw 18. The handle is a manually operated component located at the outer end of the screw, which can be a cylindrical or ring-shaped structure made of metal or engineering plastic, rigidly fixed to the screw by welding or threaded connection. This feature allows the operator to directly apply rotational torque, controlling the displacement trajectory of the arc-shaped slide rod within the blind hole via threaded transmission. The rigid connection design between the handle and the screw allows the operator to drive the screw into or out of the groove through rotational action, thereby causing the arc-shaped slide rod to slide along the arc-shaped blind hole. When the screw is screwed into the groove, the arc-shaped slide rod is locked in the closed position, forming a physical obstruction across the hook opening; when the screw is screwed out of the groove, the slide rod can slide freely to open the hook. During operation, the rotation angle of the handle corresponds to the displacement of the screw. The operator can perceive the locking status through tactile feedback from the handle, while the change in the handle's position provides a visual indication of the locking status.

[0025] Working process: The operator controls the position of the arc-shaped slide rod in the arc-shaped blind hole through the screw. When the first screw and the second screw are screwed into the second groove and the third groove, the arc-shaped slide rod is fully retracted, realizing the full opening of the hook. When the first screw and the second screw are screwed out of the second groove and the third groove, the arc-shaped slide rod is dragged by the first screw and the second screw. When the first screw and the second screw are screwed into the first groove and the second groove, the arc-shaped slide rod is fully extended to close the opening, realizing the hook opening lock state.

[0026] Compared to existing technologies, traditional spring-loaded latches rely on elastic elements to maintain the locking state, which carries the risk of irreversible failure. This solution employs a rigid sliding rod and threaded locking, with the locking state directly maintained by the metal structure, eliminating the aging problem of elastic elements. Existing automatic locking devices cannot provide clear position indications; this solution achieves visual confirmation of the locking state through three grooved positioning points. Traditional devices are prone to jamming in dusty environments; this solution uses a clearance fit design for the sliding contact surface, combined with a self-cleaning thread function, adapting to harsh working conditions. This application solves the locking failure problem caused by unreliable spring mechanisms, ensuring the stability of the locking state through a rigid sliding rod and threaded locking. The manual position switching mechanism allows operators to intuitively confirm the locking state, avoiding misoperation. The mechanical locking structure maintains reliable performance in harsh environments such as low temperature and high humidity, extending the device's service life.

[0027] In the description of this utility model, the term "multiple" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship 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. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A load hook anti-unhooking device for a lifting spreader comprising a rotating hook assembly and a locking mechanism, characterized in that, The rotating hook assembly includes, from top to bottom, a lifting ring (1), a rotating mechanism (2), a connecting pin (3), and a hook (4). The top of the hook (4) is fixedly connected to a connecting base (5). The top of the connecting base (5) is rotatably connected to the rotating mechanism (2) through the connecting pin (3). The top of the rotating mechanism (2) is vertically mounted with a cylindrical threaded shaft (6). The bottom of the lifting ring (1) is threadedly connected to the cylindrical threaded shaft (6) and fastened by a hexagonal nut (7). The locking mechanism includes an arc-shaped blind hole (8) with a total central angle of 180° inside the hook (4). A coaxial arc hole (9) communicating with the arc-shaped blind hole (8) is provided on the side wall of the hook (4). The curvature center of the coaxial arc hole (9) coincides with the curvature center of the arc-shaped blind hole (8). The total central angle of the coaxial arc hole (9) is also 180°. The arc trajectory of the arc-shaped blind hole (8) crosses the hook opening (10) of the hook (4). The arc-shaped blind hole (8) is divided into two segments. The arc-shaped segment A, with its center of curvature, is located at the upper part of the hook opening (10), and the arc-shaped segment B is located at the lower part of the hook opening (10). The central angle α corresponding to the arc-shaped segment A at the upper part is smaller than the central angle β corresponding to the arc-shaped segment B at the lower part. The sum of the central angle α and the central angle β is 180°, the central angle β is 120°, and the central angle α is 60°. The arc-shaped blind hole (8) has a central angle α of 180° and a central angle β of 120°. An arc-shaped sliding rod (11) with a central angle of 120° is slidably provided inside the segment. The arc-shaped sliding rod (11) is provided with a first through hole (12) and a second through hole (13) with internal threads. The central angle between the first through hole (12) and the second through hole (13) is 90°. The inner side of the arc-shaped blind hole (8) is provided with a first groove (14), a second groove (15) and a third groove (16) with internal threads. The first groove (14) is located in the arc-shaped section A of the arc-shaped blind hole (8). The second groove (15) and the third groove (16) are located in the arc-shaped section B of the arc-shaped blind hole (8). The central angle between the first groove (14) and the second groove (15) and between the second groove (15) and the third groove (16) is 90°. The first through hole (12) and the second through hole (13) are respectively connected by threads to a first screw (17) and a second screw (18).

2. The anti-unhooking device for a lifting spreader according to claim 1, characterized in that The outer ends of the first screw (17) and the second screw (18) are provided with handles (19).

3. The load hooking device according to claim 1, characterized in that The lifting ring (1) is a U-shaped lifting ring.

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