A crane hook anti-derailment locking device

Abstract

This utility model discloses a crane hook anti-slip locking device, including a hook body, a mounting cover on the hook body, a sliding frame on the inner wall of the mounting cover, a limiting tooth on the inner wall of the mounting cover on one side of the sliding frame, a latch connected to the sliding frame and connected to the limiting tooth, a connecting plate on the sliding frame, an upper baffle hinged to the connecting plate, and a lower baffle hinged to the upper baffle. Upper and lower torsion springs with opposite rotation directions are located at the hinge point. A support plate is located on the upper baffle near the lower baffle, with the other side of the support plate located below the lower baffle. The beneficial effects of this utility model are that the mounting cover is connected to the hook body by a detachable connecting frame, and the elastic potential energy of the upper and lower torsion springs enables the baffle to automatically reset, ensuring reliable locking to prevent the suspended object from slipping when there is no external force; the support plate limits excessive rotation of the lower baffle, enhancing overall stability; the sliding frame, limiting tooth, and latch cooperate to adjust the position of the locking components, improving adaptability to different suspended objects.

Description

Technical Field

[0001] This utility model belongs to the field of crane hook anti-detachment technology, and in particular relates to a crane hook anti-detachment locking device. Background Technology

[0002] During crane operations, the hook, as a key component supporting the load, directly affects operational safety in terms of its anti-detachment performance. Currently, most common anti-detachment devices for lifting hooks on the market employ a single baffle combined with a spring structure, using the baffle to block the hook opening and prevent the load from falling.

[0003] However, these traditional devices have some limitations, such as the fixed position of the baffle, which makes it difficult to adjust flexibly according to the size of the object being lifted. For objects that are large or irregularly shaped, interference between the baffle and the object can easily occur, affecting lifting efficiency. Furthermore, they are not compatible with hooks of different sizes.

[0004] In addition, the locking structure of some anti-detachment devices is fixedly connected to the hook. When internal components are worn or malfunction, disassembly and repair are difficult, requiring a lot of time and manpower, which affects the normal operation of the crane.

[0005] Therefore, given the shortcomings of existing crane hook anti-derailment devices in terms of adjustment flexibility, locking reliability, maintenance convenience, and structural stability, there is an urgent need to develop an anti-derailment locking device that can achieve flexible adjustment, reliable locking, easy maintenance, and structural stability to meet the requirements of efficient and safe crane operation. Therefore, we need to design a crane hook anti-detachment locking device to solve these problems. Utility Model Content

[0006] The problem to be solved by this utility model is to provide a crane hook anti-detachment locking device.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A crane hook anti-detachment locking device includes a hook body, a connecting frame on the hook body, a mounting cover on the connecting frame, a sliding frame on the inner wall of the mounting cover, a limiting tooth on one side of the inner wall of the mounting cover, a latch connected to the sliding frame, the latch connected to the limiting tooth, a connecting plate on the sliding frame, an upper baffle hinged to the connecting plate, a lower baffle hinged to the upper baffle, an upper torsion spring at the hinge point between the connecting plate and the upper baffle, and a lower torsion spring at the hinge point between the lower baffle and the upper baffle, the upper and lower torsion springs having opposite directions of rotation, and a support plate fixedly mounted on the upper baffle near the lower baffle, the other side of the support plate being located below the lower baffle.

[0008] Preferably, the sliding frame is provided with an installation tube and an adjustment groove. The installation tube is fixedly connected to the sliding frame. A pull rod is provided inside the installation tube, and both ends of the pull rod extend from both ends of the installation tube. The latch is fixed to one end of the pull rod, and the other end of the pull rod is located outside the mounting cover and is fixedly provided with a handle. A limit ring and a spring are fitted on the pull rod located inside the installation tube. A through groove is also provided on the side wall of the installation tube, and an adjustment groove is also provided on the sliding frame. A limit bolt is provided in the adjustment groove and the through groove. The end of the limit bolt passes through the limit ring and is located inside the pull rod. The limit ring is fixedly connected to the pull rod through the limit bolt.

[0009] This design, through the mounting tube, limits and protects the pull rod, preventing it from bending or shifting under force and ensuring precise engagement between the latch and the limiting teeth. The combination of the limiting bolt, limiting ring, and adjusting groove not only restricts the range of motion of the pull rod and prevents excessive slippage, but also allows adjustment of the spring preload by changing the position of the limiting bolt, adapting to different locking force requirements under various working conditions and improving the device's adjustment flexibility. The spring's elasticity ensures that the latch remains tightly engaged with the limiting teeth, guaranteeing the stability of the locked state and preventing the latch from disengaging from the limiting teeth due to vibration or other factors. The handle is located on the outside of the mounting cover, facilitating manual control of the pull rod by the operator to separate the latch from the limiting teeth, making operation convenient.

[0010] Preferably, a slide rail is fixedly provided on the inner wall of the mounting cover, the sliding frame is slidably connected to the mounting cover through the slide rail, and a slide groove is provided on the side wall of the mounting cover opposite to the limiting tooth, and the free end of the pull rod extends out from the slide groove and is located outside the mounting cover.

[0011] This design, by incorporating a slide rail within the mounting cover, ensures a smoother sliding connection between the sliding frame and the mounting cover, reducing frictional resistance during sliding, minimizing component wear, and extending the device's service life. The slide groove provides a movement channel for the pull rod while restricting its sliding direction, ensuring the accuracy of the pull rod's movement of the latch and preventing the pull rod's deviation from affecting the engagement precision of the latch and the limiting teeth, thus guaranteeing the reliability of locking and unlocking operations.

[0012] Preferably, the connecting plate is located above the sliding frame, and a fixing plate is provided below the sliding frame. The connecting plate and the fixing plate are connected by bolts, and the connecting plate is fixedly connected to the sliding frame by cooperating with the fixing plate.

[0013] With this configuration, the connecting plate and the fixed plate are connected by bolts, achieving a firm fixation to the sliding frame. This allows the plate to withstand external impacts during hoisting and ensures the stability of the upper and lower baffles. The detachable connection method facilitates the inspection, replacement, or maintenance of components such as the connecting plate, upper baffle, and lower baffle, reducing maintenance costs and operational difficulties, and improving the practicality and economy of the device.

[0014] Preferably, the mounting cover is detachably mounted on the connecting frame by bolts, and a cover plate is also detachably provided on the mounting cover. The cover plate has a connecting groove, and the connecting plate extends out of the connecting groove and is hinged to the upper baffle.

[0015] This design allows the connecting frame to be detachably mounted on the hook body via bolts, and the mounting cover to be detachably mounted on the connecting frame via bolts. This facilitates the complete disassembly of the mounting cover, making it easy to inspect or replace internal components such as the sliding frame, tie rod, and springs, thus improving maintenance convenience. The detachable cover further simplifies the maintenance of the internal structure, while also protecting internal components from dust and debris that could affect the operation of the device. The connecting groove provides space for the connecting plate to move, ensuring that the upper and lower baffles can rotate without being obstructed by the cover, thus balancing protection and functionality.

[0016] Preferably, the upper baffle is hinged to the connecting plate via an upper rotating shaft, and the upper torsion spring is mounted on the upper rotating shaft; the lower baffle is hinged to the upper baffle via a lower rotating shaft, and the lower torsion spring is mounted on the lower rotating shaft.

[0017] This configuration allows for more flexible hinges between the upper baffle and the connecting plate, and between the lower baffle and the upper baffle, via the upper and lower rotating shafts. This ensures smooth rotation of the baffles and prevents jamming. The upper and lower torsion springs are respectively mounted on their corresponding rotating shafts, ensuring secure installation and preventing them from easily falling off. They provide a stable reset torque for the baffles, ensuring that the upper and lower baffles can quickly return to the locked position after the hoisting rope enters the hook, thus improving the device's automatic protection capability and response speed.

[0018] Preferably, a lower limit seat and an upper limit seat are also fixedly provided on the inner wall of the mounting cover where the slide groove is provided, the upper limit seat is located above the lower limit seat, and the slide groove is located between the upper limit seat and the lower limit seat.

[0019] With this configuration, the lower and upper limit seats strictly limit the vertical movement range of the mounting tube, preventing excessive sliding of the pull rod from causing the latch to disengage from the limit teeth or other components to be damaged, ensuring that the pull rod moves within a safe and effective range. At the same time, this limiting design can protect components such as springs from excessive stretching or compression, extending their service life and further improving the safety and stability of the device operation.

[0020] Preferably, the length of the groove does not exceed the length of the limiting tooth.

[0021] This design prevents the latch from detaching from the limiting teeth when the installation tube moves along the slide.

[0022] The advantages and positive effects of this utility model are: This utility model utilizes a detachable connecting frame to connect the mounting cover to the hook body. Through the hinged engagement of the upper and lower baffles, combined with the upper and lower torsion springs rotating in opposite directions, automatic reset can be achieved using the elastic potential energy of the torsion springs, ensuring reliable locking without external force and effectively preventing accidental slippage of the suspended object. The supporting function of the lower baffle limits its excessive rotation, preventing locking failure due to uncontrolled lower baffle angle, thus enhancing the stability and anti-slip reliability of the overall structure. A sliding frame and limiting teeth are set inside the mounting cover, and the relative positions of the sliding frame and limiting teeth are fixed by a latch, which can adjust the relative position of the locking assembly formed by the upper and lower baffles on the hook body, improving the adaptability of the device. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the tray installation position of this utility model; Figure 3 This is a schematic cross-sectional view of the internal structure of the sleeve of this utility model; Figure 4 This is a schematic diagram of the sliding frame position adjustment of this utility model. Figure 1 ; Figure 5 This is a schematic diagram of the sliding frame position adjustment of this utility model. Figure 2 .

[0025] The annotations in the attached figures are explained as follows: 1. Hook body; 2. Handle; 3. Connecting frame; 4. Mounting cover; 5. Slide groove; 6. Cover plate; 7. Connecting groove; 8. Connecting plate; 9. Upper torsion spring; 10. Upper rotating shaft; 11. Upper baffle; 12. Lower rotating shaft; 13. Limiting ring; 14. Lower baffle; 15. Support plate; 16. Limiting tooth; 17. Clamping tongue; 18. Pull rod; 19. Slide rail; 20. Fixing plate; 21. Upper limit seat; 22. Lower limit seat; 23. Mounting tube; 24. Sliding frame; 25. Adjusting groove; 26. Limiting bolt; 27. Lower torsion spring; 28. Spring; 29. ​​Through groove. Detailed Implementation

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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," "second," etc., 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, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0028] The present invention will be further described below with reference to the accompanying drawings: Example 1: As Figures 1-5As shown, a crane hook anti-detachment locking device includes a hook body 1, a mounting cover 4 on the hook body 1, a sliding frame 24 on the inner wall of the mounting cover 4, a limiting tooth 16 on the inner wall of the mounting cover 4 on one side of the sliding frame 24, a latch 17 connected to the sliding frame 24, the latch 17 being connected to the limiting tooth 16, a connecting plate 8 on the sliding frame 24, an upper baffle 11 hinged to the connecting plate 8, a lower baffle 14 hinged to the upper baffle 11, an upper torsion spring 9 at the hinge of the connecting plate 8 and the upper baffle 11, and a lower torsion spring 27 at the hinge of the lower baffle 14 and the upper baffle 11, the upper torsion spring 9 and the lower torsion spring 27 having opposite rotation directions, and a support plate 15 fixedly mounted on the upper baffle 11 near the lower baffle 14, the other side of the support plate 15 being located below the lower baffle 14.

[0029] The sliding frame 24 provides a mounting base for the connecting plate 8 through its cooperation with the mounting cover 4. The connecting plate 8 serves as a support carrier for the upper baffle 11, allowing the upper baffle 11 to rotate around the hinge point. The hinge design of the upper baffle 11 and the lower baffle 14, together with the upper torsion spring 9 and the lower torsion spring 27 with opposite rotation directions, forms a bidirectional elastic constraint. The upper torsion spring 9 drives the upper baffle 11 to rotate in the locking direction, and the lower torsion spring 27 drives the lower baffle 14 to rotate in the locking direction. The combined effect of the two can improve the tightness of the locking. The support plate 15 is located below the lower baffle 14. When the lower baffle 14 is subjected to a downward force, the support plate 15 can directly bear the force, preventing the lower baffle 14 from rotating excessively and exceeding the constraint range of the lower torsion spring 27. This ensures that the lower torsion spring 27 can always drive the lower baffle 14 to return to its original position. Thus, through the synergistic effect of the upper baffle 11 and the lower baffle 14, the opening of the hook body 1 is effectively closed.

[0030] An installation tube 23 and an adjustment groove 25 are provided on the sliding frame 24. The installation tube 23 is fixedly connected to the sliding frame 24. A pull rod 18 is provided inside the installation tube 23, and both ends of the pull rod 18 extend from both ends of the installation tube 23. A latch 17 is fixed to one end of the pull rod 18, and the other end of the pull rod 18 is located outside the installation cover 4 and is fixedly provided with a handle 2. A limit ring 13 and a spring 28 are fitted on the pull rod 18 located inside the installation tube 23. A through groove 29 is also provided on the side wall of the installation tube 23, and an adjustment groove 25 is also provided on the sliding frame 24. A limit bolt 26 is provided in the adjustment groove 25 and the through groove 29. The end of the limit bolt 26 passes through the limit ring 13 and is located inside the pull rod 18. The limit ring 13 is fixedly connected to the pull rod 18 through the limit bolt 26.

[0031] The mounting tube 23 is fixedly connected to the sliding frame 24, allowing the mounting tube 23 to move synchronously with the sliding frame 24. The mounting tube 23 provides an axial movement channel for the pull rod 18, ensuring that the pull rod 18 can only move along the axis of the mounting tube 23. One end of the pull rod 18 is connected to the latch 17, and the other end is connected to the handle 2, realizing the linkage between external operation and the internal latch 17 action. The operator can move the latch 17 by pulling the handle 2, thereby controlling the engagement state of the latch 17 and the limiting tooth 16. The spring 28 is fitted on the pull rod 18, with one end in contact with the limiting ring 13 and the other end... Contacting the inner wall of the mounting tube 23, when the pull rod 18 moves the limiting ring 13, the spring 28 is compressed or stretched, thereby generating an elastic force. This elastic force can drive the pull rod 18 to reset, so that the latch 17 automatically engages with the limiting tooth 16. The through groove 29 and the adjusting groove 25 provide movement space for the limiting bolt 26. The limiting bolt 26 fixes the limiting ring 13 and the pull rod 18, which not only limits the position of the limiting ring 13 on the pull rod 18, but also limits the maximum movement distance of the pull rod 18 through the cooperation with the through groove 29 and the adjusting groove 25, so as to avoid excessive movement of the pull rod 18 and damage to the components.

[0032] A slide rail 19 is fixedly installed on the inner wall of the mounting cover 4. The sliding frame 24 is slidably connected to the mounting cover 4 through the slide rail 19. A groove 5 is opened on the side wall of the mounting cover 4 opposite to the limiting tooth 16. The free end of the pull rod 18 extends out from the groove 5 and is located outside the mounting cover 4.

[0033] The slide rail 19 on the inner wall of the mounting cover 4 provides a precise sliding trajectory for the sliding frame 24, ensuring that the sliding frame 24 can only move along the slide rail 19 direction. This ensures that the sliding frame 24 will not deviate during movement, thereby ensuring that the latch 17 on the sliding frame 24 always maintains a corresponding positional relationship with the limiting tooth 16 on the mounting cover 4. The slide groove 5 is opened on the side wall opposite to the limiting tooth 16, and the pull rod 18 extends from the slide groove 5. The slide groove 5 provides a channel for the pull rod 18 to pass through the mounting cover 4 and cooperates with the slide rail 19 to further restrict the movement direction of the sliding frame 24 and the pull rod 18, so that the movement of the two remains synchronous and stable, and avoids affecting the cooperation accuracy of the latch 17 and the limiting tooth 16 due to the deviation of the pull rod 18.

[0034] The connecting plate 8 is located above the sliding frame 24, and the fixing plate 20 is provided below the sliding frame 24. The connecting plate 8 and the fixing plate 20 are connected by bolts, and the connecting plate 8 is fixedly connected to the sliding frame 24 by cooperating with the fixing plate 20.

[0035] The connecting plate 8 is located above the sliding frame 24, and the fixing plate 20 is located below the sliding frame 24. After the two are connected by bolts, they can clamp and fix the sliding frame 24 from the upper and lower sides, making the connection between the connecting plate 8 and the sliding frame 24 more secure. This clamping and fixing method can transfer the force on the connecting plate 8 to the sliding frame 24 and the fixing plate 20, avoiding damage due to excessive force on a single connection point. At the same time, the bolt connection is easy to disassemble. When it is necessary to replace or repair the connecting plate 8, the connecting plate 8 can be separated from the sliding frame 24 simply by removing the bolts.

[0036] A connecting frame 3 is detachably mounted on the hook body 1 by bolts. The mounting cover 4 is detachably mounted on the connecting frame 3 by bolts. A cover plate 6 is also detachably mounted on the mounting cover 4. A connecting groove 7 is provided on the cover plate 6. The connecting plate 8 extends out of the connecting groove 7 and is hinged to the upper baffle 11.

[0037] The detachable connection between the hook body 1 and the connecting frame 3 allows the connecting frame 3 to be replaced or adjusted according to the size of the mounting cover 4. The connecting frame 3 is then connected to the mounting cover 4 by bolts, achieving indirect fixation between the mounting cover 4 and the hook body 1, and facilitating the disassembly and maintenance of the mounting cover 4. The cover plate 6 is detachably mounted on the mounting cover 4, which not only protects the sliding frame 24, pull rod 18 and other components inside the mounting cover 4, but also facilitates the opening of the cover plate 6 to operate the internal components. The connecting groove 7 provides a passage for the connecting plate 8, so that the connecting plate 8 can drive the upper baffle 11 to move without interfering with the cover plate 6, ensuring the normal rotation of the upper baffle 11.

[0038] The upper baffle 11 is hinged to the connecting plate 8 via the upper rotating shaft 10, and the upper torsion spring 9 is mounted on the upper rotating shaft 10. The lower baffle 14 is hinged to the upper baffle 11 via the lower rotating shaft 12, and the lower torsion spring 27 is mounted on the lower rotating shaft 12.

[0039] The upper rotating shaft 10 hinges the upper baffle 11 to the connecting plate 8, allowing the upper baffle 11 to rotate around the upper rotating shaft 10. The upper torsion spring 9 is fitted onto the upper rotating shaft 10, with its two ends connected to the connecting plate 8 and the upper baffle 11 respectively. The upper rotating shaft 10 provides a mounting fulcrum for the upper torsion spring 9, ensuring that the upper torsion spring 9 can stably apply torque to the upper baffle 11 in the direction of rotation when deformed. The lower rotating shaft 12 hinges the lower baffle 14 to the upper baffle 11, allowing the lower baffle 14 to rotate around the lower rotating shaft 12. The lower torsion spring 27 is mounted on the lower rotating shaft 12, with its two ends connected to the upper baffle 11 and the lower baffle 14 respectively. The lower rotating shaft 12 provides a mounting fulcrum for the lower torsion spring 27, ensuring that the lower torsion spring 27 can stably apply torque to the lower baffle 14 in the direction of rotation when deformed. By setting the upper rotating shaft 10 and the lower rotating shaft 12 respectively, the rotation independence of the upper baffle 11 and the lower baffle 14 is realized. At the same time, with the corresponding torsion spring, the stable realization of the reset function of both is guaranteed.

[0040] Furthermore, the combination of the upper baffle 11 and the lower baffle 14 can satisfy the closure of large-opening hooks, while if the hook opening is small, it can be closed by the upper baffle 11 alone, thus making the locking device more widely applicable.

[0041] A lower limit seat 22 and an upper limit seat 21 are fixedly installed on the inner wall of the mounting cover 4, which is provided with a sliding groove 5. The upper limit seat 21 is located above the lower limit seat 22, and the sliding groove 5 is located between the upper limit seat 21 and the lower limit seat 22. The length of the sliding groove 5 does not exceed the length of the limiting tooth 16.

[0042] The lower limit seat 22 and the upper limit seat 21 are located on the upper and lower sides of the slide groove 5, respectively. When the pull rod 18 moves along the slide groove 5, it will contact the lower limit seat 22 when it moves to the lower limit position and contact the upper limit seat 21 when it moves to the upper limit position. This limits the range of movement of the pull rod 18 by mechanical blocking. Constraining the dimensions of the slide groove 5 and the limiting tooth 16 can prevent the latch 17 from disengaging from the limiting tooth 16 when the mounting tube 23 moves along the slide groove 5.

[0043] The working process of this embodiment is as follows: First, the connecting frame 3 is fixed on the hook body 1. Then, the mounting shaft is fixed to the connecting frame 3 with bolts. Next, the handle 2 is used to pull the pull rod 18, which drives the latch 17 to move, separating it from the limiting tooth 16. When the pull rod 18 moves, the limiting ring 13 will compress the spring 28. After the latch 17 separates from the limiting tooth 16, the mounting tube 23 can drive the sliding frame 24 to move along the slide rail 19. The position of the sliding frame 24 is adjusted to ensure that the lower baffle 14 can be blocked by the tip of the hook body 1 to lock the hook body 1. Then, the pull rod 18 is released, and the spring 28 pushes the pull rod 18 to reset. The latch 17 will engage with the limiting tooth 16 to fix the position of the sliding frame 24.

[0044] In the initial state, the upper torsion spring 9 and the lower torsion spring 27 are in a natural or slightly deformed state, respectively. Under the action of the upper torsion spring 9, the upper baffle 11 rotates towards the outside of the opening of the hook body 1, and the lower baffle 14 rotates towards the inside of the opening of the hook body 1 under the action of the lower torsion spring 27. After the lower baffle 14 comes into contact with the support plate 15, it will be blocked. Therefore, it will move towards the outside of the hook body 1 together with the upper baffle 11. When the lower baffle 14 moves to contact the tip of the hook body 1, it will be blocked, thus sealing the opening of the hook body 1 together with the upper baffle 11, forming an anti-loosening locking state.

[0045] During hoisting, when the hoisting rope comes into contact with the lower baffle 14 or the upper baffle 11, it will push the lower baffle 14 or the upper baffle 11 towards the inside of the opening of the hook body 1. The upper torsion spring 9 will be compressed and stored. When the hoisting rope enters the hook, the upper torsion spring 9 will reset, so that the upper baffle 11 and the lower baffle 14 together close the opening of the hook body 1 to prevent detachment and lock.

[0046] When it is necessary to remove the hook, the worker pushes the lower baffle 14 or the upper baffle 11 into the opening of the hook body 1 to separate the lower baffle 14 from the hook body 1 and then removes the hoisting rope from the hook body 1. After releasing the upper baffle 11 or the lower baffle 14, the upper torsion spring 9 will drive the lower baffle 14 to move and contact the hook body 1 to form a lock.

[0047] It should be noted that the hook anti-detachment locking device described in this application does not meet the safety requirements for locking the hook of a person because it is equipped with components such as springs. Therefore, it is mainly used on the hook of a load and cannot be used on the hook of a person.

[0048] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A crane hook anti-derailment locking device, comprising a hook body (1), characterized in that: The hook body (1) is provided with a mounting cover (4), and a sliding frame (24) is provided on the inner wall of the mounting cover (4). A limiting tooth (16) is provided on the inner wall of the mounting cover (4) on one side of the sliding frame (24). A latch (17) is connected to the sliding frame (24), and the latch (17) is connected to the limiting tooth (16). A connecting plate (8) is also provided on the sliding frame (24), and an upper baffle (11) is hinged to the connecting plate (8). A lower baffle (14) is hinged, an upper torsion spring (9) is provided at the hinge between the connecting plate (8) and the upper baffle (11), and a lower torsion spring (27) is provided at the hinge between the lower baffle (14) and the upper baffle (11). The upper torsion spring (9) and the lower torsion spring (27) have opposite directions of rotation. A support plate (15) is fixedly provided on the upper baffle (11) near the lower baffle (14), and the other side of the support plate (15) is located below the lower baffle (14).

2. The crane hook anti-derailment locking device according to claim 1, characterized in that: An installation tube (23) and an adjustment groove (25) are provided on the sliding frame (24). The installation tube (23) is fixedly connected to the sliding frame (24). A pull rod (18) is provided inside the installation tube (23), and both ends of the pull rod (18) extend from both ends of the installation tube (23). A latch (17) is fixed to one end of the pull rod (18), and the other end of the pull rod (18) is located outside the mounting cover (4) and is fixedly provided with a handle (2) inside the installation tube (23). A limiting ring (13) and a spring (28) are fitted on the pull rod (18). A through groove (29) is also provided on the side wall of the mounting tube (23), and an adjustment groove (25) is also provided on the sliding frame (24). A limiting bolt (26) is provided in the adjustment groove (25) and the through groove (29). The end of the limiting bolt (26) passes through the limiting ring (13) and is located in the pull rod (18). The limiting ring (13) is fixedly connected to the pull rod (18) through the limiting bolt (26).

3. The crane hook anti-derailment locking device according to claim 2, characterized in that: A slide rail (19) is fixedly provided on the inner wall of the mounting cover (4). The sliding frame (24) is slidably connected to the mounting cover (4) through the slide rail (19). A groove (5) is provided on the side wall of the mounting cover (4) opposite to the limiting tooth (16). The free end of the pull rod (18) extends out from the groove (5) and is located outside the mounting cover (4).

4. The crane hook anti-derailment locking device according to claim 1, characterized in that: The connecting plate (8) is located above the sliding frame (24), and a fixing plate (20) is provided below the sliding frame (24). The connecting plate (8) and the fixing plate (20) are connected by bolts, and the connecting plate (8) is fixedly connected to the sliding frame (24) by cooperating with the fixing plate (20).

5. The crane hook anti-derailment locking device according to claim 1, characterized in that: The hook body (1) is detachably provided with a connecting frame (3) by bolts. The mounting cover (4) is detachably installed on the connecting frame (3) by bolts. A cover plate (6) is also detachably provided on the mounting cover (4). A connecting groove (7) is provided on the cover plate (6). The connecting plate (8) extends out from the connecting groove (7) and is hinged to the upper baffle (11).

6. The crane hook anti-derailment locking device according to claim 1, characterized in that: The upper baffle (11) is hinged to the connecting plate (8) via the upper rotating shaft (10), and the upper torsion spring (9) is mounted on the upper rotating shaft (10). The lower baffle (14) is hinged to the upper baffle (11) via the lower rotating shaft (12), and the lower torsion spring (27) is mounted on the lower rotating shaft (12).

7. The crane hook anti-derailment locking device according to claim 3, characterized in that: A lower limit seat (22) and an upper limit seat (21) are also fixedly provided on the inner wall of the mounting cover (4) on which the slide groove (5) is provided. The upper limit seat (21) is located above the lower limit seat (22), and the slide groove (5) is located between the upper limit seat (21) and the lower limit seat (22).

8. The crane hook anti-derailment locking device according to claim 3, characterized in that: The length of the groove (5) does not exceed the length of the limiting tooth (16).

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