Tower crane hook with anti-unhooking device

Abstract

The utility model relates to tower crane hook related technical field discloses a tower crane hook with anti -unhooking device, including the connecting block that is fixedly installed with outside the shell, the rolling device and the middle layer drive arrangement that are fixedly installed with inside the shell, the locking device that is fixedly installed with inside the connecting block, the lower end fixedly connected with the hook of locking device, the surface rolling of rolling device is equipped with movable cable, the winding assembly that is fixedly installed with inside the middle layer drive arrangement, through the dual protection structure of '' mechanical linkage + one -way locking'', realize the automatic locking of hook opening, when hoisting thing rises, movable cable drives rolling device, the linkage of middle layer drive arrangement, promote flexible steel sheet winding, extrude spring power storage, finally through the inlay cooperation of blocking baffle and hook slot opening forms physical closure, and the one -way transmission characteristic of drive gear avoids reverse loosening.

Description

Technical Field

[0001] This utility model belongs to the technical field of tower crane hooks, and more specifically, it relates to a tower crane hook with an anti-disengagement device. Background Technology

[0002] In fields such as construction and logistics hoisting, tower cranes are core lifting equipment, and the safety of their hooks directly determines operational efficiency and the safety of personnel and property. Currently, most tower crane hooks on the market adopt anti-derailment structures such as "manual locking" or "simple spring baffles." These designs have significant shortcomings in practical applications and are difficult to meet the safety requirements under complex working conditions. Traditional crane hook anti-derailment relies on manual operation—operators must manually close and lock the stop plate before hoisting, and manually unlock it after hoisting. However, in high-altitude operations, operators are prone to inadequate locking due to limited visibility, confined operating space, or fatigue. Furthermore, when the hoisted object is heavy and swaying violently, the manually locked stop plate can be easily forced open by external forces, causing a hook detachment accident. At the same time, the manual intervention mode reduces hoisting efficiency and cannot meet the demands of modern construction for high-frequency, fast-paced operations. Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a tower crane hook with an anti-disengagement device. Utility Model Content

[0003] (a) Technical problems to be solved In view of the above situation and to overcome the defects of the existing technology, the purpose of this utility model is to provide a tower crane hook with an anti-disengagement device, which effectively solves the problem of "tower crane hook disengagement" in existing devices.

[0004] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: A tower crane hook with an anti-disengagement device includes a lifting shell, a connecting block fixedly installed on the outer side of the lifting shell, and a rolling device and a middle layer drive device fixedly installed on the inner side of the lifting shell; A locking device is fixedly installed on the inner side of the connecting block, and a hook is fixedly connected to the lower end of the locking device; The rolling device has a movable steel cable rolling on its surface, and the middle driving device has a winding assembly fixedly installed inside. The movable steel cable, in conjunction with the rotation of the rolling device, locks and lifts the winding assembly. The locking device, in conjunction with the locking and lifting of the winding assembly, locks and reinforces the hook to prevent it from coming off.

[0005] Preferably, a rolling device is fixedly installed inside the lifting shell. The rolling device includes a central rotating shaft, and two sets of gears are provided on the outer side of the central rotating shaft. A movable steel cable is slidably arranged between the two sets of gears.

[0006] Preferably, the middle layer driving device includes a winding assembly and a winding component, the winding assembly including an arc-shaped groove and a winding groove, and the winding assembly is fixedly installed in the arc-shaped groove and the winding groove.

[0007] Preferably, the winding assembly includes a winding groove, the winding groove is fixed on the arc-shaped groove, and two sets of drive gears are rotatably provided on the winding groove, with a gap between the two sets of drive gears, and a flexible steel sheet is wound in the gap.

[0008] Preferably, the lower end of the flexible steel sheet is fixedly connected to a telescopic component, the telescopic component includes a contact plate and four sets of fixed tubes, the fixed tubes are fixedly connected to the winding groove, a movable rod is slidably provided inside the fixed tube, a contact plate is fixedly connected to the upper end of the movable rod, and the contact plate is fixedly connected to the flexible steel sheet.

[0009] Preferably, a locking device is fixedly connected to the lower end of the movable rod. The locking device includes an upper block, which is fixedly connected to the movable rod. A cylindrical box is fixedly connected to the lower end of the upper block. A compression spring is fixedly installed between the upper block and the cylindrical box. A paddle locking device is provided inside the cylindrical box.

[0010] Preferably, the paddle locking device includes a housing, and a compression plate is slidably disposed inside the housing, the compression plate being fixedly connected to the compression spring.

[0011] Preferably, a vertical movable groove is fixedly installed inside the housing, a circular shaft is slidably installed in the vertical movable groove, a baffle is hinged on the circular shaft, and a pressing rod is fixedly connected to the baffle, with a 140-degree angle between the pressing rod and the baffle.

[0012] Preferably, a hook is fixedly connected to the lower end of the winding groove, and a slot is provided at the opening of the hook, which forms a mating fit with the barrier plate.

[0013] (III) Beneficial Effects Compared with the prior art, this utility model provides a tower crane hook with an anti-disengagement device, which has the following beneficial effects: This utility model discloses a tower crane hook with an anti-disengagement device. Through a dual protection structure of "mechanical linkage + one-way locking," the hook opening is automatically locked. When the load is lifted, the movable steel cable drives the rolling device and the middle drive device to work together, causing the flexible steel sheet to wind and compress the spring to store force. Finally, the blocking baffle and the hook slot are engaged to form a physical seal. The one-way transmission characteristic of the drive gear prevents reverse loosening, completely blocking the disengagement path of the load due to vibration, tilting, or power interruption. Compared with traditional hooks that rely on manual locking, this device can lock without human intervention, eliminating safety hazards caused by operational negligence and greatly improving the safety of lifting operations under complex conditions.

[0014] This utility model relates to a tower crane hook with an anti-disengagement device. The locking and unlocking process of the device is synchronized with the tower crane's lifting and lowering actions: it automatically locks during ascent and only requires manual movement of the barrier plate during descent or loading, eliminating the need for additional complex operations, reducing the labor intensity of operators, and adapting to efficient lifting rhythms. On the other hand, the multi-structure design ensures stability—the guide cooperation of four sets of fixed pipes and movable rods prevents component displacement, the 140-degree angled compression rod and barrier plate form a labor-saving lever to improve locking efficiency, and the lifting shell, as the load-bearing foundation, provides stable support for all components. The overall structure takes into account both functionality and durability, and can adapt to the high-frequency, high-load operating environment of tower cranes for a long time, extending the service life of the device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall appearance structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the overall side view structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the overall front view of this utility model.

[0018] Figure 4 This is a schematic diagram of the internal appearance structure of this utility model.

[0019] Figure 5 This is a schematic diagram of the internal front view structure of this utility model.

[0020] Figure 6 This is a schematic diagram of the overall front sectional structure of this utility model.

[0021] Figure 7 This is a side sectional view of the overall structure of this utility model.

[0022] Figure 8 This utility model Figure 7 A magnified structural diagram at point A.

[0023] In the diagram: 11. Lifting shell; 12. Connecting block; 13. Hook; 14. Locking device; 15. Rolling device; 16. Middle layer drive device; 17. Gear set; 18. Central rotating shaft; 19. Arc-shaped groove; 20. Winding groove; 21. Winding assembly; 22. Upper end block; 23. Cylindrical box; 24. Compression spring; 25. Barrier baffle; 26. Winding assembly; 27. Drive gear; 28. Flexible steel sheet; 29. ​​Contact plate; 30. Fixed tube; 31. Movable rod; 32. Movable steel cable; 33. Compression plate; 34. Vertical movable groove; 35. Compression rod; 36. Locking spring; 37. Round shaft; 38. Insert groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0026] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] Example 1: This embodiment provides a tower crane hook with an anti-disengagement device, which has the following technical features.

[0029] Please see Figure 1-8 The system includes a lifting shell 11, with a connecting block 12 fixedly installed on the outer side of the lifting shell 11, a rolling device 15 and a middle-level drive device 16 fixedly installed on the inner side of the lifting shell 11, and a locking device 14 fixedly installed on the inner side of the connecting block 12. A hook 13 is fixedly connected to the lower end of the locking device 14. The lifting shell 11 serves as the load-bearing foundation of the entire device, providing installation support for each component and ensuring structural stability. The connecting block 12 connects and fixes the device to the tower crane body, ensuring a firm overall installation. The rolling device 15 and the middle-level drive device 16 work together to form an anti-disengagement drive transmission system. The locking device 14 works with the hook 13 to form a core protection against disengagement, and the automatic locking and unlocking of the hook opening is achieved through mechanical linkage, improving the safety of the lifting operation.

[0030] A movable steel cable 32 is rolled on the surface of the rolling device 15, and a winding assembly 21 is fixedly installed inside the middle drive device 16. The movable steel cable 32, in conjunction with the rotation of the rolling device 15, locks and lifts the winding assembly 21. The movable steel cable 32 serves as a power transmission medium, transmitting the lifting power of the tower crane to the rolling device 15. The rolling device 15 converts the linear motion of the steel cable into its own rotational motion through rotation, thereby driving the winding assembly 21 to move. The winding assembly 21 is locked and lifted under the drive of the rolling device 15. Its one-way locking characteristic ensures the stability of power transmission during the lifting process, prevents accidental loosening due to power interruption, and provides a power basis for the subsequent locking device operation.

[0031] The locking device 14, in conjunction with the locking and lifting of the winding assembly 21, secures the hook 13, preventing it from coming off the hook. The locking device 14 and the winding assembly 21 form a linkage mechanism; when the winding assembly 21 locks and rises, it simultaneously drives the locking device 14 to securely lock it to the hook 13. This linkage design ensures that the hook opening automatically closes when the load is lifted, physically blocking the load's path to fall and solving the problem of traditional hooks easily coming off due to vibration or tilting, significantly improving the safety factor of lifting operations.

[0032] Preferably, a rolling device 15 is fixedly installed inside the housing 11. The rolling device 15 includes a central rotating shaft 18, and two sets of gears 17 are provided on the outer side of the central rotating shaft 18. A movable steel cable 32 is slidably arranged between the two sets of gears 17. The central rotating shaft 18, as the core rotating component of the rolling device, provides an installation reference for the gears 17 and transmits torque. The sliding engagement between the two sets of gears 17 and the movable steel cable 32 enhances the stability of the steel cable transmission through gear meshing, preventing slippage of the steel cable. On the other hand, it evenly distributes the tension of the steel cable, reducing the load on a single set of gears and extending the service life of the components. This structural design enables the power of the steel cable to be efficiently and stably converted into the rotational power of the gears, providing a reliable power input for the subsequent drive device.

[0033] Preferably, the middle-layer drive device 16 includes a winding assembly 21 and a winding assembly 26. The winding assembly 21 includes an arc-shaped groove 19 and a winding groove 20, and the winding assembly 26 is fixedly installed within the arc-shaped groove 19 and the winding groove 20. The arc-shaped groove 19 and the winding groove 20 together form the installation space of the winding assembly. The arc-shaped structure design conforms to the winding trajectory of the flexible steel sheet, reducing frictional resistance during the winding process. The winding groove 20 provides precise installation positioning for the winding assembly 26, ensuring its stable movement trajectory. The two work together to enable the winding assembly 26 to smoothly achieve the winding and release of the flexible steel sheet during operation, ensuring the continuity of power transmission and providing stable stroke control for the locking device.

[0034] Preferably, the winding assembly 26 includes a winding groove 20, which is fixed on an arc-shaped groove 19. Two sets of drive gears 27 are rotatably mounted on the winding groove 20, with a gap between them. A flexible steel sheet 28 is wound within the gap. The two sets of drive gears 27, through their spacing, form a clamping drive structure for the flexible steel sheet 28. The gear meshing drives the flexible steel sheet 28 to achieve the winding action. Its unidirectional drive characteristic (effective in forward rotation, ineffective in reverse rotation) ensures that the flexible steel sheet can only be wound tightly when the load is raised, and will not loosen when it is lowered or stationary, forming a unidirectional locking mechanism. The flexible steel sheet 28 has a certain rigidity and flexibility, which can transmit tension to achieve power transmission, and can also adapt to the curved trajectory of the winding groove, ensuring the smoothness of the winding process and providing direct power for the movement of the telescopic assembly.

[0035] Preferably, a telescopic assembly is fixedly connected to the lower end of the flexible steel sheet 28. The telescopic assembly includes a contact plate 29 and four sets of fixed tubes 30. The fixed tubes 30 are fixedly connected to the winding groove 20. A movable rod 31 is slidably arranged inside the fixed tubes 30. The upper end of the movable rod 31 is fixedly connected to the contact plate 29, and the contact plate 29 is fixedly connected to the flexible steel sheet 28. The contact plate 29 acts as a connecting medium between the flexible steel sheet 28 and the movable rod 31, uniformly transmitting the winding tension of the flexible steel sheet to the movable rod 31. The sliding cooperation between the four sets of fixed tubes 30 and the movable rod 31 forms a stable guiding structure, ensuring that the movable rod 31 can only move in the vertical direction, avoiding deviation or jamming during the operation. This telescopic structure transforms the winding motion of the flexible steel sheet into the linear lifting motion of the movable rod 31, realizing the conversion of the power transmission direction. At the same time, the multiple sets of guiding structures improve the overall stability of the operation, providing precise stroke control for the locking device.

[0036] Preferably, a locking device 14 is fixedly connected to the lower end of the movable rod 31. The locking device 14 includes an upper block 22, which is fixedly connected to the movable rod 31. A cylindrical box 23 is fixedly connected to the lower end of the upper block 22. A compression spring 24 is fixedly installed between the upper block 22 and the cylindrical box 23. A lever locking device is provided inside the cylindrical box 23. The upper block 22 transmits the lifting power of the movable rod 31 to the compression spring 24. When the movable rod rises, the upper block 22 rises synchronously and stretches the compression spring 24, allowing the spring to accumulate elastic potential energy. The cylindrical box 23 provides a closed installation space for the lever locking device, protecting the internal components from external dust and impurities. The elastic force of the compression spring 24 serves as the reset power of the lever locking device. When the load rises, the spring tension causes the lever locking device to lock. When descending or unloaded, the spring resets for easy unlocking. The elastic characteristics of the spring enable the automatic response of the locking device, improving operational convenience and safety.

[0037] Preferably, the paddle locking device includes a housing, within which a compression plate 33 is slidably disposed, and the compression plate 33 is fixedly connected to a compression spring 24. The housing provides installation and protection for the internal components of the paddle locking device; the compression plate 33 serves as the force transmission medium between the compression spring 24 and other locking components, uniformly transmitting the spring's elastic force to subsequent structures, and its sliding characteristics ensure stable force transmission direction; through the sliding action of the compression plate 33, the linear tension of the spring is converted into a driving force on the paddle structure, making the locking action smoother and more controllable, avoiding locking failure due to sudden changes in force. Preferably, refer to the attached diagram. Figure 7 and appendix Figure 8 A vertical movable groove 34 is fixedly installed inside the housing. A circular shaft 37 slides within the vertical movable groove 34. A blocking baffle 25 is hinged to the circular shaft 37. A pressing rod 35 is fixedly connected to the blocking baffle 25, forming a 140-degree angle between the pressing rod 35 and the blocking baffle 25. The vertical movable groove 34 provides precise sliding guidance for the circular shaft 37, ensuring that it can only move in the vertical direction, thereby controlling the movement trajectory of the blocking baffle 25. The hinge structure between the circular shaft 37 and the blocking baffle 25 allows the baffle to rotate at a certain angle, meeting the opening and closing requirements of the hook opening. The 140-degree angled pressing rod 35 and the blocking baffle 25 form a force-saving lever structure. When the pressing rod is subjected to force, it can efficiently drive the blocking baffle 25 to rotate and lock. At the same time, this angle design ensures the stability of the structure after locking, making it less prone to loosening due to external vibration, thus improving the reliability of locking.

[0038] Preferably, a hook 13 is fixedly connected to the lower end of the winding groove 20. The opening of the hook 13 has a slot, which forms a mating fit with the barrier plate 25. As the component that directly supports the hoisted object, the hook 13's structural strength ensures hoisting safety. The slot at the opening fits with the mating fit of the barrier plate 25, forming a physically closed structure in the locked state, completely blocking the path of the hoisted object falling from the opening. This mating fit design has a self-locking characteristic. After locking, unless actively unlocked, the barrier plate will not detach from the slot due to the pulling force of the hoisted object, structurally ensuring the effectiveness of the anti-detachment function and adapting to hoisting needs under various complex working conditions.

[0039] In summary, when using this device, first install it on the tower crane cable via the connecting block 12 to ensure that the lifting shell 11 is firmly connected to the tower crane body. Then connect the movable steel cable 32 to the tower crane winding machine. After completing the installation and commissioning of the device, it can be put into normal hoisting operations.

[0040] When the device needs to perform hook-hanging operation, the operator manually moves the barrier baffle 25. At this time, the barrier baffle 25 rotates around the circular shaft 37 in the vertical movable groove 34, and the pressing rod 35 at its upper end moves synchronously. After the pressing plate 33 is pressed, it compresses the pressing spring 24, causing the barrier baffle 25 to move inward and the opening of the hook 13 to be in the open state. Then, the sling or ring of the hoisting object is put into the hook 13 to complete the hook-hanging operation.

[0041] When the tower crane starts and lifts the load, the tower crane winding machine pulls the movable steel cable 32. The movable steel cable 32 slides between the two sets of gears 17 of the rolling device 15, driving the central rotating shaft 18 to rotate. The rotation of the central rotating shaft 18 synchronously drives the gear set 17 to rotate. Since the drive gear 27 and the gear set 17 form a transmission engagement and have a one-way locking characteristic (power transmission can only be achieved when rotating forward, and the winding action cannot be driven when rotating in reverse), the gear set 17 will drive the two sets of drive gears 27 to rotate synchronously forward. When the drive gear 27 rotates, its meshing structure with the flexible steel sheet 28 causes the flexible steel sheet 28 to achieve a winding action in the winding groove 20. The curved surface structure of the arc-shaped groove 19 provides guidance for the winding of the flexible steel sheet 28 and reduces frictional resistance. As the flexible steel sheet 28 is wound and tightened, the contact plate 29 connected to its lower end is pulled upward. The contact plate 29 drives the four sets of movable rods 31 to slide upward within the fixed tube 30 (the fixed connection between the fixed tube 30 and the winding groove 20 ensures that the movable rods 31 only move vertically and avoid deviation); the rise of the movable rods 31 drives the upper block 22 to move upward synchronously, so that the compression spring 24 between the upper block 22 and the cylindrical box 23 is stretched and accumulates elastic potential energy; the tension of the compression spring 24 is transmitted to the compression plate 33, causing the compression plate 33 to slide upward within the housing, and the compression plate 33 generates a thrust on the compression rod 35. Since the compression rod 35 and the blocking baffle 25 form a 140-degree angle, this thrust is converted into the rotational force of the blocking baffle 25 through the lever principle, so that the blocking baffle 25 rotates around the circular shaft 37 toward the opening of the hook 13, and finally forms a mating fit with the slot at the opening of the hook 13, realizing the mechanical locking of the opening of the hook 13.

[0042] When the hoisted object is lowered or needs to be removed, the tower crane winding machine releases the movable steel cable 32. The movable steel cable 32 drives the central rotating shaft 18 to reverse. At this time, the drive gear 27 cannot be driven due to its one-way locking characteristic, and the winding assembly 26 stops winding. The flexible steel sheet 28 is gradually released under the action of gravity and the restoring force of the compression spring 24. The movable rod 31 moves down accordingly, and the tension of the compression spring 24 decreases. The operator can manually move the blocking baffle 25 again to disengage the locking mechanism, open the hook 13, and complete the object removal operation.

[0043] The entire process, through the pulling and releasing of the movable steel cable 32, links the rolling device 15, the middle driving device 16, and the locking device 14, to achieve automatic locking of the hook 13 when the hoisted object is raised and controllable unlocking when it is lowered / picked up. By using the synergistic effect of the mechanical structure to replace the traditional method of manual locking, the risk of hook disengagement caused by operational negligence or working conditions such as vibration and tilt is effectively avoided, and the safety and reliability of tower crane hoisting operations are significantly improved.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tower crane hook with an anti-disengagement device, comprising a lifting shell (11), wherein a connecting block (12) is fixedly installed on the outer side of the lifting shell (11), and a rolling device (15) and a middle-layer drive device (16) are fixedly installed on the inner side of the lifting shell (11), characterized in that: A locking device (14) is fixedly installed on the inner side of the connecting block (12), and a hook (13) is fixedly connected to the lower end of the locking device (14). The rolling device (15) has a movable steel cable (32) that rolls on its surface. The middle driving device (16) has a winding assembly (21) that is fixedly installed inside. The movable steel cable (32) rotates in conjunction with the rolling device (15) to lock and lift the winding assembly (21). The locking device (14) works in conjunction with the locking and lifting of the winding assembly (21) to lock and reinforce the hook (13) and prevent it from coming off the hook.

2. A tower crane hook with an anti-disengagement device according to claim 1, characterized in that, The inner side of the hanging shell (11) is fixedly installed with a rolling device (15). The rolling device (15) includes a central rotating shaft (18). Two sets of gears (17) are provided on the outer side of the central rotating shaft (18). A movable steel cable (32) is slidably provided between the two sets of gears (17).

3. A tower crane hook with an anti-disengagement device according to claim 2, characterized in that, The middle layer drive device (16) includes a winding assembly (21) and a winding assembly (26). The winding assembly (21) includes an arc-shaped groove (19) and a winding groove (20). The winding assembly (26) is fixedly installed in the arc-shaped groove (19) and the winding groove (20).

4. A tower crane hook with an anti-disengagement device according to claim 3, characterized in that, The winding assembly (26) includes a winding groove (20), which is fixed on the arc-shaped groove (19). Two sets of drive gears (27) are rotatably provided on the winding groove (20), with a gap between the two sets of drive gears (27), and a flexible steel sheet (28) is wound in the gap.

5. A tower crane hook with an anti-disengagement device according to claim 4, characterized in that, The lower end of the flexible steel sheet (28) is fixedly connected to a telescopic component. The telescopic component includes a contact plate (29) and four sets of fixed tubes (30). The fixed tubes (30) are fixedly connected to the winding groove (20). A movable rod (31) is slidably provided inside the fixed tube (30). The upper end of the movable rod (31) is fixedly connected to the contact plate (29). The contact plate (29) is fixedly connected to the flexible steel sheet (28).

6. A tower crane hook with an anti-disengagement device according to claim 5, characterized in that, The lower end of the movable rod (31) is fixedly connected to a locking device (14). The locking device (14) includes an upper block (22), which is fixedly connected to the movable rod (31). A cylindrical box (23) is fixedly connected to the lower end of the upper block (22). A compression spring (24) is fixedly installed between the upper block (22) and the cylindrical box (23). A paddle locking device is provided inside the cylindrical box (23).

7. A tower crane hook with an anti-disengagement device according to claim 6, characterized in that, The paddle locking device includes a housing, and a compression plate (33) is slidably disposed inside the housing. The compression plate (33) is fixedly connected to the compression spring (24).

8. A tower crane hook with an anti-disengagement device according to claim 7, characterized in that, A vertical movable groove (34) is fixedly installed inside the housing. A circular shaft (37) is slidably installed inside the vertical movable groove (34). A barrier plate (25) is hinged on the circular shaft (37). A pressing rod (35) is fixedly connected to the barrier plate (25). A 140-degree angle is formed between the pressing rod (35) and the barrier plate (25).

9. A tower crane hook with an anti-disengagement device according to claim 8, characterized in that, The lower end of the winding groove (20) is fixedly connected to a hook (13), and the opening of the hook (13) is provided with a slot, which forms a fitting with the barrier baffle (25).

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