Lifting hook fixing device for crane

Abstract

The invention discloses a lifting hook fixing device for a crane, and particularly relates to the technical field of hoisting equipment, the lifting hook fixing device comprises a fixing box, a fixing plate is fixedly connected to the bottom of the fixing box, a lifting hook is arranged in the fixing box, a steel wire rope is fixedly connected to the top of the lifting hook, and first square grooves are formed in the left side and the right side of the fixing box; the inner walls of the two first square grooves are fixedly connected with hollow blocks, and a fixing assembly is arranged in the fixing box. According to the lifting hook fixing device for the crane, the fixing assembly is arranged to fix the lifting hook, when severe weather such as strong wind and strong waves is encountered, the lifting hook cannot be blown to shake, repeated friction between a steel wire rope and components such as the lifting hook cannot occur, the abrasion speed of the outer surface of the steel wire rope is reduced, and the service life of the steel wire rope is prolonged. The diameter and strength of the steel wire rope are guaranteed, the lifting hook can be prevented from colliding with surrounding goods, a ship body, personnel and the like, and the safety of the device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting equipment, and particularly relates to a hook fixing device for a crane. Background Art

[0002] A marine crane is a large deck machinery on a ship and is a device for loading and unloading goods on a ship.

[0003] The crane hook is an important component on the crane for hanging heavy objects. It is usually made of high-strength metal materials, such as high-quality alloy steel, to ensure that it can withstand huge weights and tensile forces. The shape and structure of the hook are carefully designed to provide a stable and reliable hanging function. In design, the hook needs to meet a series of strict standards and specifications, including requirements in terms of strength, toughness, wear resistance, fatigue resistance, etc.

[0004] In the patent document of a crane hook disclosed in Publication No. CN110902553A, it includes a fixed cover body fixed to the crane sliding assembly and a wire winding drum installed at the middle position inside the fixed cover body. A winding rope is wound around the outer side of the wire winding drum, and both ends of the winding rope are provided with tension ropes. At the bottom inside the tension ropes, there is a fixed roller that cooperates with the inside of the tension ropes. Both ends of the fixed roller are installed at the top inside the U-shaped fixed seat through rotating rods and can rotate at the top inside the U-shaped fixed seat. By hanging a heavy object at the top inside the hook, and then using a hinged fastener to clamp the open-loop position of the hook, by starting the crane and starting the drive motor to drive the wire winding drum to rotate, the winding rope is wound by the wire winding drum, thereby driving the tension rope to move. The U-shaped fixed seat is driven by the tension rope, and thus the hook is driven by the U-shaped fixed seat. The function of buffering is achieved through the adjusting spring; however, the following defects still exist in the implementation of the above patent document:

[0005] When the marine crane is horizontally placed in a non-working state and encounters bad weather such as strong winds and big waves, the lifting hook will be blown and shake. This will not only cause repeated friction between components such as the steel wire rope and the hook, resulting in accelerated wear of the outer surface of the steel wire rope, reducing the diameter and strength of the steel wire rope, but also easily touch the goods, hull, personnel, etc. around the lifting hook, causing safety accidents and posing serious safety hazards. Therefore, we propose a hook fixing device for a crane to solve the above problems. Summary of the Invention

[0006] The main purpose of the present invention is to provide a hook fixing device for a crane, which can effectively solve the above problems.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0008] A hook fixing device for a crane, comprising a fixing box, a fixing plate is fixedly connected to the bottom of the fixing box, a hook is arranged inside the fixing box, a steel wire rope is fixedly connected to the top of the hook, square grooves one are opened on both the left and right sides of the fixing box, hollow blocks are fixedly connected to the inner walls of the two square grooves one, a fixing component is arranged inside the fixing box, a tightening component is arranged on the outer surface of the fixing box, and a limiting component is arranged inside the fixing box.

[0009] Preferably, the fixing component includes a hollow frame, the top of the hollow frame contacts the bottom of the hook, sliding blocks one are fixedly connected to the front and back of the hollow frame, round rods one are slidably connected to the inner walls of the four sliding blocks one, the inner walls of the two hollow blocks are fixedly connected to the top and bottom of the two round rods one on the same side, springs one are sleeved on the outer surfaces of the four round rods one, the tops of the four springs one are fixedly connected to the bottoms of the sliding blocks one on the same side, and the bottoms of the four springs one are fixedly connected to the bottom inner walls of the hollow blocks on the same side.

[0010] Preferably, a bidirectional threaded rod is rotatably connected to the inner wall of the hollow frame, a motor is fixedly connected to the left end of the hollow frame, the output end of the motor is fixedly connected to the left end of the bidirectional threaded rod, and two moving blocks one are threadedly connected to the outer surface of the bidirectional threaded rod.

[0011] Preferably, rotating rods are rotatably connected to the front and back of the two moving blocks one, connecting plates are arranged on the front and back of the moving blocks one, one ends of the two connecting plates close to each other are rotatably connected to the ends of the two rotating rods on the same side away from the moving blocks one, and clamping blocks are fixedly connected to the tops of the ends of the two connecting plates close to each other.

[0012] Preferably, the tightening component includes a moving block two, the inner wall of the moving block two is threadedly connected to the outer surface of the bidirectional threaded rod, the moving block two is located on the left side of the two moving blocks one, fixing rods are fixedly connected to the front and back of the moving block two, the two fixing rods are symmetrically arranged with the moving block two as the center, a gear bar is fixedly connected to the end of the fixing rod away from the moving block two, a gear is meshed and connected to the bottom of the gear bar, a rotating shaft is fixedly connected to the inner wall of the gear, the outer surface of the rotating shaft close to the center of the fixing box is rotatably connected to the inner wall of the fixing box, and a rotating rod is fixedly connected to the outer surface of the rotating shaft away from the fixing box.

[0013] Preferably, a connecting rod is fixedly connected to the top right of the rotating rod, a circular groove one is opened at the center of the connecting rod, a sliding rod one is slidably connected to the inner wall of the circular groove one, a tightening block is fixedly connected to the end of the sliding rod one away from the connecting rod, a spring two is sleeved on the outer surface of the sliding rod one, one end of the spring two away from the connecting rod is fixedly connected to the outer surface of the tightening block, and one end of the spring two away from the tightening block is fixedly connected to the outer surface of the connecting rod.

[0014] Preferably, the number of the limiting components is two, and the two limiting components are symmetrically arranged with the center of the fixed box as the center. Each limiting component includes three fixing blocks. One end of the three fixing blocks away from the hook is fixedly connected to the inner wall of the fixed box. Grooves I are formed in the inner walls of the three fixing blocks, and sliding rods II are slidably connected to the inner walls of the three grooves I.

[0015] Preferably, one end of the three sliding rods II close to the hook is commonly connected to a limiting plate. Spring III is sleeved on the outer surfaces of the three sliding rods II. One end of the three springs III away from the hook is fixedly connected to the surface of the same-side fixing block, and one end of the three springs III close to the hook is fixedly connected to the surface of the limiting plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. By arranging the fixing component, specifically, after the hook is placed, the motor is turned on to drive the bidirectional threaded rod to rotate, so that the two clamping blocks are respectively in contact with the front and back of the hook to fix the hook. When encountering bad weather such as strong winds and big waves, the lifting hook will not be blown and shaken, so that the steel wire rope will not be repeatedly rubbed against components such as the hook, slowing down the wear speed of the outer surface of the steel wire rope, ensuring the diameter and strength of the steel wire rope, and moreover, it can avoid the hook from colliding with surrounding goods, the hull, personnel, etc., improving the safety of the device.

[0018] 2. By arranging the tightening component, specifically, when the bidirectional threaded rod rotates, it will drive the second moving block to move to the left, drive the connecting rod to rotate through the gear rack, and as the connecting rod rotates, the tightening block will contact the steel wire rope. When the tightening block contacts the steel wire rope, it will cause a certain deformation of the steel wire rope, tighten the steel wire rope, make the contact between the hook and the pulley more uniform, reduce the occurrence of local wear, and improve the service life of the steel wire rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of the present invention;

[0020] Figure 2 is the overall structural schematic diagram of the left side of the present invention;

[0021] Figure 3 is the Figure 2 enlarged structural schematic diagram of A in the present invention;

[0022] Figure 4 is the overall structural schematic diagram of the tightening block of the present invention;

[0023] Figure 5 is the overall structural schematic diagram of the inside of the fixed box of the present invention;

[0024] Figure 6 Schematic diagram of the overall structure of the hollow frame of the present invention;

[0025] Figure 7 Schematic diagram of the overall structure of the clamping block of the present invention;

[0026] Figure 8 Schematic diagram of the overall structure of the limiting plate of the present invention.

[0027] In the figure: 1, fixed box; 11, fixed plate; 12, lifting hook; 13, steel wire rope; 14, guiding block; 2, hollow block; 21, fixing component; 22, hollow frame; 23, first round rod; 231, first slider; 232, first spring; 24, bidirectional threaded rod; 25, motor; 26, first moving block; 261, rotating rod; 262, connecting plate; 263, clamping block; 3, tightening component; 31, second moving block; 32, fixed rod; 33, rack; 34, gear; 341, rotating shaft; 342, rotating rod; 35, connecting rod; 351, first sliding rod; 352, second spring; 353, tightening block; 4, limiting component; 41, fixed block; 42, second sliding rod; 43, third spring; 44, limiting plate. Specific embodiments

[0028] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0029] Embodiment 1

[0030] As Figure 1-8 shown, a lifting hook fixing device for a crane includes a fixed box 1, a fixed plate 11 is fixedly connected to the bottom of the fixed box 1, a lifting hook 12 is arranged inside the fixed box 1, a steel wire rope 13 is fixedly connected to the top of the lifting hook 12, square grooves one are opened on both the left and right sides of the fixed box 1, hollow blocks 2 are fixedly connected to the inner walls of the two square grooves one, a fixing component 21 is arranged inside the fixed box 1, a tightening component 3 is arranged on the outer surface of the fixed box 1, and a limiting component 4 is arranged inside the fixed box 1.

[0031] Specifically, in order to achieve the purpose that the lifting hook will not be blown and shaken in bad weather such as strong winds and big waves, refer to Figure 5 and Figure 6, in this embodiment, the fixing component 21 includes a hollow frame 22, the top of the hollow frame 22 is in contact with the bottom of the hook 12, the front and back of the hollow frame 22 are fixedly connected with a first slider 231 respectively, the inner walls of the four first sliders 231 are all slidably connected with a first round rod 23, the inner walls of the two hollow blocks 2 are fixedly connected with the top and bottom of the two first round rods 23 on the same side respectively, the outer surfaces of the four first round rods 23 are all sleeved with a first spring 232, the tops of the four first springs 232 are fixedly connected with the bottoms of the first sliders 231 on the same side respectively, and the bottoms of the four first springs 232 are fixedly connected with the bottoms of the inner walls of the hollow blocks 2 on the same side respectively.

[0032] During the implementation process, when the bottom of the hook 12 contacts the top of the hollow frame 22, due to gravity, the hollow frame 22 will drive several first sliders 231 to slide downward on the outer surface of the corresponding first round rod 23. During the sliding process of the first slider 231, the first spring 232 will be squeezed and deformed, and the deformed first spring 232 will generate an elastic force, so that the force when the first slider 231 moves downward can be buffered and offset, avoiding the surface coating or anti-corrosion layer of the hook being damaged due to the too fast downward movement speed of the hook 12 and colliding with the inner wall of the fixed box 1, and improving the service life of the hook 12.

[0033] Further, referring to Figure 6 and Figure 7 , in this embodiment, a bidirectional threaded rod 24 is rotatably connected to the inner wall of the hollow frame 22, a motor 25 is fixedly connected to the left end of the hollow frame 22, the output end of the motor 25 is fixedly connected to the left end of the bidirectional threaded rod 24, and two moving blocks 26 are threadedly connected to the outer surface of the bidirectional threaded rod 24.

[0034] Further, referring to Figure 7 , in this embodiment, a rotating rod 261 is rotatably connected to the front and back of the two moving blocks 26, a connecting plate 262 is arranged on the front and back of the moving block 26, one end of the two connecting plates 262 close to each other is rotatably connected to the end of the same side of the two rotating rods 261 away from the moving block 26, and a clamping block 263 is fixedly connected to the top of one end of the two connecting plates 262 close to each other.

[0035] During the implementation process, after the hook 12 is placed, the motor 25 is turned on to drive the rotation of the bidirectional threaded rod 24. While the bidirectional threaded rod 24 rotates, it drives the two first moving blocks 26 to move away from each other. When the two first moving blocks 26 move, they respectively drive the rotating rods 261 on their backs and fronts to rotate. While the two rotating rods 261 on the front and back rotate, they drive the two connecting plates 262 to move closer to each other. When the connecting plates 262 move, they drive the clamping blocks 263 to move into contact with the surface of the hook 12. By the two clamping blocks 263 respectively contacting the front and back of the hook 12, the hook 12 can be fixed inside the fixed box 1. When encountering harsh weather such as strong winds and big waves, the lifting hook will not be blown and shaken, so that the steel wire rope will not rub repeatedly with components such as the hook, slowing down the wear speed of the outer surface of the steel wire rope, ensuring the diameter and strength of the steel wire rope, and moreover, it can prevent the hook from colliding with surrounding goods, the hull, personnel, etc., improving the safety of the device.

[0036] Embodiment 2

[0037] In this embodiment, on the basis of Embodiment 1, the steel wire rope 13 connecting the hook 12 is tightened.

[0038] Specifically, in order to achieve the purpose of tightening the steel wire rope, making the contact between the hook and the pulley more uniform, and reducing the occurrence of local wear, refer to Figure 2 and Figure 3 , in this embodiment, the tightening assembly 3 includes a second moving block 31. The inner wall of the second moving block 31 is threadedly connected to the outer surface of the bidirectional threaded rod 24. The second moving block 31 is located on the left side of the two first moving blocks 26. Both the front and back of the second moving block 31 are fixedly connected with fixing rods 32. The two fixing rods 32 are symmetrically arranged with the second moving block 31 as the center. The end of the fixing rod 32 away from the second moving block 31 is fixedly connected with a gear rack 33. The bottom of the gear rack 33 is meshed with a gear 34. The inner wall of the gear 34 is fixedly connected with a rotating shaft 341. The outer surface of the rotating shaft 341 near the center of the fixed box 1 is rotatably connected to the inner wall of the fixed box 1. The outer surface of the rotating shaft 341 away from the fixed box 1 is fixedly connected with a rotating rod 342.

[0039] Further, refer to Figure 1 and Figure 4, in this embodiment, a connecting rod 35 is fixedly connected to the top right side of the rotating rod 342. A circular groove one is provided at the center of the connecting rod 35. A first sliding rod 351 is slidably connected to the inner wall of the circular groove one. A tightening block 353 is fixedly connected to the end of the first sliding rod 351 away from the connecting rod 35. A second spring 352 is sleeved on the outer surface of the first sliding rod 351. One end of the second spring 352 away from the connecting rod 35 is fixedly connected to the outer surface of the tightening block 353, and one end of the second spring 352 away from the tightening block 353 is fixedly connected to the outer surface of the connecting rod 35.

[0040] During the implementation process, when the hollow frame 22 moves downward, it will drive the toothed bar 33 to move downward, so that the bottom of the toothed bar 33 contacts and meshes with the top of the gear 34. While the bidirectional threaded rod 24 rotates, it will drive the second moving block 31 to move to the left. When the second moving block 31 moves, it will drive the fixing rods 32 on its front and back sides to move to the left. When the fixing rods 32 move, they will drive the toothed bar 33 to move to the left. When the toothed bar 33 moves, it will drive the gear 34 to rotate. When the gear 34 rotates, it will drive the rotating shaft 341 to rotate. While the rotating shaft 341 rotates, it will drive the rotating rod 342 to rotate. While the rotating rod 342 rotates, it will drive the connecting rod 35 to rotate. As the connecting rod 35 rotates, the tightening block 353 will contact the steel wire rope 13. When the tightening block 353 contacts the steel wire rope 13, it will cause a certain deformation of the steel wire rope 13, tighten the steel wire rope 13, make the contact between the hook and the pulley more uniform, reduce the occurrence of local wear, and improve the service life of the steel wire rope.

[0041] Further, referring to Figure 1 and Figure 8 , in this embodiment, the number of the limiting components 4 is two. The two limiting components 4 are symmetrically arranged with the center of the fixed box 1 as the symmetry center. The limiting component 4 includes three fixing blocks 41. One ends of the three fixing blocks 41 away from the hook 12 are fixedly connected to the inner wall of the fixed box 1. Grooves one are provided on the inner walls of the three fixing blocks 41. Second sliding rods 42 are slidably connected to the inner walls of the three grooves one.

[0042] Further, referring to Figure 8 , in this embodiment, one ends of the three second sliding rods 42 close to the hook 12 are commonly connected to a limiting plate 44. Third springs 43 are sleeved on the outer surfaces of the three second sliding rods 42. One ends of the three third springs 43 away from the hook 12 are fixedly connected to the surfaces of the same-side fixing blocks 41, and one ends of the three third springs 43 close to the hook 12 are fixedly connected to the surface of the limiting plate 44.

[0043] During the implementation process, since the tops of the two limit plates 44 and the bottom of the hook 12 are both inclined surfaces, when the hook 12 descends, it will push the two limit plates 44 to move in opposite directions. When the limit plates 44 move, they will drive several second slide bars 42 to slide in the inner walls of their corresponding fixed blocks 41 respectively. When the second slide bars 42 slide, they will squeeze the third springs 43 to cause them to deform. The deformed third springs 43 will generate elastic forces to push the limit plates 44 to closely adhere to the surface of the hook 12, and the hook 12 is limited by the two limit plates 44, improving the stability of the hook 12 during storage and fixation.

[0044] The working principle of the present invention is as follows: When the hook of the marine crane is not in use, the hook 12 is moved to the top of the device and then lowered. Through the two guide blocks 14, the hook 12 can accurately move to the top of the hollow frame 22. Since the tops of the two limiting plates 44 and the bottom of the hook 12 are both beveled, when the hook 12 descends, it will push the two limiting plates 44 to move in opposite directions. When the limiting plates 44 move, they will drive several second sliding rods 42 to slide respectively inside the inner walls of their corresponding fixing blocks 41. When the second sliding rods 42 slide, they will squeeze the third springs 43 to cause them to deform. The deformed third springs 43 will generate elastic forces to push the limiting plates 44 to closely adhere to the surface of the hook 12. The hook 12 is limited by the two limiting plates 44, improving the stability of the hook 12 during storage and fixation. When the bottom of the hook 12 contacts the top of the hollow frame 22, due to gravity, the hollow frame 22 will drive several first sliders 231 to slide downward on the outer surfaces of their corresponding first round rods 23. During the sliding process of the first sliders 231, they will squeeze the first springs 232 to cause them to deform. The deformed first springs 232 will generate elastic forces to buffer and offset the force when the first sliders 231 move downward, avoiding the surface coating or anti-corrosion layer of the hook being damaged due to the too-fast downward movement speed of the hook 12 and colliding with the inner wall of the fixing box 1, and improving the service life of the hook 12. When the hook 12 is placed, the motor 25 is turned on to drive the bidirectional threaded rod 24 to rotate. While the bidirectional threaded rod 24 rotates, it will drive the two first moving blocks 26 to move away from each other. While the two first moving blocks 26 move, they will respectively drive the rotating rods 261 on their fronts and backs to rotate. While the two rotating rods 261 on the front and back rotate, they will drive the two connecting plates 262 to move closer to each other. When the connecting plates 262 move, they will drive the clamping blocks 263 to move into contact with the surface of the hook 12. By the two clamping blocks 263 respectively contacting the front and back of the hook 12, the hook 12 can be fixed inside the fixing box 1. When encountering harsh weather such as strong winds and big waves, the lifting hook will not be blown and shaken, so that the steel wire rope will not rub repeatedly with components such as the hook, slowing down the wear speed of the outer surface of the steel wire rope, ensuring the diameter and strength of the steel wire rope, and moreover, it can avoid the hook from colliding with surrounding goods, the hull, personnel, etc., improving the safety of the device. While the hollow frame 22 moves downward, it will drive the gear rack 33 to move downward, making the bottom of the gear rack 33 contact and engage with the top of the gear 34. While the bidirectional threaded rod 24 rotates, it will drive the second moving block 31 to move to the left. When the second moving block 31 moves, it will drive the fixing rods 32 on its front and back to move to the left. When the fixing rods 32 move, they will drive the gear rack 33 to move to the left. When the gear rack 33 moves, it will drive the gear 34 to rotate. When the gear 34 rotates, it will drive the rotating shaft 341 to rotate. While the rotating shaft 341 rotates, it will drive the rotating rod 342 to rotate. While the rotating rod 342 rotates, it will drive the connecting rod 35 to rotate.As the connecting rod 35 rotates, the tightening block 353 will come into contact with the steel wire rope 13. After the tightening block 353 comes into contact with the steel wire rope 13, it will cause a certain deformation of the steel wire rope 13, tighten the steel wire rope 13, make the contact between the hook and the pulley more uniform, reduce the occurrence of local wear, and improve the service life of the steel wire rope.

[0045] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A hook fixing device for a crane, comprising a fixing box (1), a fixing plate (11) fixedly connected to the bottom of the fixing box (1), a hook (12) arranged inside the fixing box (1), and a steel wire rope (13) fixedly connected to the top of the hook (12), characterized in that: The fixed box (1) is provided with a square groove 1 on the left and right sides, and the inner walls of the two square grooves 1 are fixedly connected with a hollow block (2), a fixing component (21) is arranged inside the fixed box (1), a tightening component (3) is arranged on the outer surface of the fixed box (1), and a limit position component (4) is arranged inside the fixed box (1).

2. A crane hook fixing device according to claim 1, characterized in that: The fixing assembly (21) comprises a hollow frame (22), the top of the hollow frame (22) contacts the bottom of the hook (12), the front and back of the hollow frame (22) are fixedly connected to a slider (231), the inner walls of four sliders (231) are slidably connected to a round rod (23), the inner walls of the two hollow blocks (2) are fixedly connected to the top and bottom of the two round rods (23) on the same side, the outer surfaces of the four round rods (23) are sleeved with a spring (232), the tops of the four springs (232) are fixedly connected to the bottom of the slider (231) on the same side, and the bottoms of the four springs (232) are fixedly connected to the bottom of the inner wall of the hollow block (2) on the same side.

3. A crane hook fixing device according to claim 2, characterized in that: The inner wall of the hollow frame (22) is rotatably connected to a bidirectional threaded rod (24); the left end of the hollow frame (22) is fixedly connected to a motor (25); the output end of the motor (25) is fixedly connected to the left end of the bidirectional threaded rod (24); and the outer surface of the bidirectional threaded rod (24) is threadedly connected to two moving blocks (26).

4. A crane hook fixing device according to claim 3, characterized in that: The front and back sides of the two moving blocks (26) are both rotatably connected to a rotating rod (261), and the front and back sides of the moving block (26) are both provided with a connecting plate (262). The ends of the two connecting plates (262) close to each other are both rotatably connected to the ends of the two rotating rods (261) on the same side away from the moving block (26), and the tops of the ends of the two connecting plates (262) close to each other are both fixedly connected to a clamping block (263).

5. A crane hook fixing device according to claim 1, characterized in that: The tightening assembly (3) comprises a second moving block (31), the inner wall of the second moving block (31) being threadedly connected to the outer surface of the bidirectional threaded rod (24), the second moving block (31) being located on the left side of the two first moving blocks (26), the front and back sides of the second moving block (31) being fixedly connected to fixed rods (32), the two fixed rods (32) being symmetrically arranged with the second moving block (31) as the center, the end of the fixed rod (32) away from the second moving block (31) being fixedly connected to a gear bar (33), the bottom of the gear bar (33) being meshingly connected to a gear (34), the inner wall of the gear (34) being fixedly connected to a rotating shaft (341), the outer surface of the rotating shaft (341) being close to the center of the fixed box (1) and being rotatably connected to the inner wall of the fixed box (1), the outer surface of the rotating shaft (341) being away from the fixed box (1) being fixedly connected to a rotating rod (342).

6. A crane hook fixing device according to claim 5, characterized in that: The top right side of the rotating rod (342) is fixedly connected to a connecting rod (35), a circular groove 1 is provided at the center of the connecting rod (35), a sliding rod 1 (351) is slidably connected to the inner wall of the circular groove 1, an end of the sliding rod 1 (351) away from the connecting rod (35) is fixedly connected to a tightening block (353), a spring 2 (352) is sleeved on the outer surface of the sliding rod 1 (351), an end of the spring 2 (352) away from the connecting rod (35) is fixedly connected to the outer surface of the tightening block (353), and an end of the spring 2 (352) away from the tightening block (353) is fixedly connected to the outer surface of the connecting rod (35).

7. A crane hook fixing device according to claim 6, characterized in that: The number of the limit assemblies (4) is two, and the two limit assemblies (4) are symmetrically arranged with the center of the fixed box (1). The limit assemblies (4) include three fixed blocks (41), and the ends of the three fixed blocks (41) away from the hook (12) are fixedly connected to the inner wall of the fixed box (1), and the inner walls of the three fixed blocks (41) are each provided with a groove 1, and the inner walls of the three grooves 1 are each slidably connected to a slide rod 2 (42).

8. A crane hook fixing device according to claim 7, characterized in that: The ends of the three sliding rods (42) close to the hook (12) are commonly connected to a limiting plate (44); the outer surfaces of the three sliding rods (42) are sleeved with springs (43); the ends of the three springs (43) away from the hook (12) are fixedly connected to the surface of the fixing block (41) on the same side; and the ends of the three springs (43) close to the hook (12) are fixedly connected to the surface of the limiting plate (44).

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