Open type lifting hook

Abstract

The invention relates to the technical field of lifting hooks, in particular to an open type lifting hook which comprises a mounting frame, a bottom frame, a lifting arm and a first supporting plate, a first inner groove is formed in the lifting arm, a first bottom plate is arranged at the bottom of the first supporting plate, and a buffer part is mounted at the bottom of the first supporting plate. According to the open type lifting hook, the supporting block drives the second bottom plate to extrude the first reset spring, the elastic deformation of the first reset spring can convert instantaneous downward pressure borne by the lifting rope into elastic potential energy, flexible buffering is achieved, and the situation that due to the fact that the lifting rope suddenly bears hard tension, local stress concentration occurs is avoided; and fault risks such as breakage and abrasion of the lifting rope are effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of lifting hook technology, and specifically to an open-type lifting hook. Background Technology

[0002] In today's society, industrial production and hoisting operations have become important forces driving economic development. Their applications are very extensive, covering not only traditional fields such as construction, logistics and transportation, and factory production, but also extending to complex and high-risk operating environments such as wind power equipment installation, large shipbuilding, bridge and tunnel engineering, nuclear power equipment maintenance, and emergency rescue. In these fields, the crane hook, as the core load-bearing component for material hoisting, directly affects the smooth progress of the entire operation process due to its safety and stability.

[0003] In various hoisting operations, the crane hook, as the core load-bearing component connecting the hoisting machinery and the hoisted materials, directly determines the safety and efficiency of the operation due to its operational stability. However, in daily hoisting operations, the problem of material swaying is always difficult to completely avoid due to the combined influence of a variety of complex factors: when working outdoors, natural factors such as strong winds and gusts will directly act on the hoisted materials, disrupting their force balance; the inertial forces generated during hoisting, luffing, and slewing operations will cause the materials to swing back and forth with the mechanical movements; in addition, improper control of the hoisting speed and braking timing by the operators, or misjudgment of the hoisting center of gravity, will also exacerbate the swaying amplitude of the materials.

[0004] The continuous swaying of the material will directly cause the hoisting rope to swing and dart violently at the hook, which can easily lead to the dangerous situation of the hoisting rope slipping off the hook. Once a detachment accident occurs, the hoisted material will instantly lose support and fall from a height, which will not only pose a fatal threat to the lives of the workers below and cause serious personal injury accidents, but also cause devastating damage to the machinery, building structures, finished materials and other equipment at the work site, forcing the interruption of production operations.

[0005] Therefore, the present invention provides an open-type lifting hook to solve the above problems. Summary of the Invention

[0006] In view of the above situation and to overcome the defects of the prior art, the present invention provides an open-type lifting hook to solve the problem that the existing crane hook, as the core load-bearing component of the lifting operation, is crucial to the safety and efficiency of the operation, and that the material swaying caused by wind, operating inertia and human error can easily lead to the hook coming off.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An open-type lifting hook includes a mounting frame, a base frame is mounted on the bottom of the mounting frame, and two booms are symmetrically mounted on the bottom of the base frame. The booms have internal grooves for carrying lifting ropes. A positioning mechanism is installed on the boom, which includes a buffer assembly. The buffer assembly includes a first support plate that can slide up and down. The two ends of the first support plate correspond to the two booms respectively. The first support plate is used to support the lifting rope. A first inner groove is opened on the boom. A first base plate is fixed to the bottom of both ends of the first support plate. The side wall of the first base plate is slidably connected to the inner wall of the first inner groove. A buffer is installed at the bottom of the first support plate to buffer the first support plate.

[0008] Preferably, the buffer includes a second base plate disposed on the lower side of the first base plate, a support block fixed between the top of the second base plate and the first base plate, and a first return spring fixed between the inner bottom wall of the second base plate having a first inner groove, for supporting the second base plate.

[0009] Preferably, the positioning mechanism further includes a limiting component, which includes a second supporting plate symmetrically arranged on both sides of the first supporting plate. The second supporting plate is also arc-shaped. The two ends of the second supporting plate correspond to the two booms respectively. A bottom block is fixed at both bottom points of the second supporting plate, and the side wall of the bottom block is slidably connected to the inner wall of the first inner groove.

[0010] Preferably, the outer wall of the second support plate is fixed with a plurality of support frames arranged at equal intervals, and the plurality of support frames are spaced apart along the arc of the second support plate. The support frame is provided with an abutment shaft on the side facing the first support plate for abutting the suspension rope to limit its position. The side of the abutment shaft facing the support frame is provided with a side support plate for supporting the abutment shaft.

[0011] Preferably, a sliding block is provided on the side of the side support plate away from the abutment shaft, and a groove adapted to the sliding block is opened on the side of the support frame facing the side support plate. The sliding block is slidably connected inside the groove to limit the sliding block. A second return spring is fixed between the side of the sliding block inside the groove and the inner wall of the groove to support the sliding block.

[0012] Preferably, the positioning mechanism further includes a driving component, which includes a first sleeve disposed on a base block. The base block has a first receiving hole adapted to the first sleeve, and the outer wall of the first sleeve is rotatably connected to the inner wall of the corresponding first receiving hole to limit the first sleeve and thus maintain its stability. A support shaft is sleeved inside the first sleeve, and the first sleeve and the support shaft are coaxially disposed. The outer wall of the support shaft fits against the inner wall of the first sleeve, and the first sleeve can slide along the axial direction of the support shaft.

[0013] Preferably, the outer surface of the first sleeve has two symmetrically fixed side frames, and the side frames have concave cavities. The support block is slidably connected inside the concave cavity. The inner wall of the concave cavity is fixed with a first linkage block, and the support block corresponds one-to-one with the first linkage block. A second linkage block is fixed on the side of the support block facing the first linkage block, and both the second linkage block and the first linkage block have arc-shaped surfaces.

[0014] Preferably, two first limiting posts are symmetrically fixed at the bottom of the second base plate, and the first limiting posts are located inside the first reset spring. The bottom of the boom is provided with a first limiting hole that matches the first limiting post, and the first limiting post is slidably connected inside the corresponding first limiting hole to limit the first limiting post.

[0015] Preferably, the second support plate is provided with a linkage mechanism, which includes a linkage shaft provided on the support frame. A pressing block is fixed on the surface of the linkage shaft. A connecting plate is rotatably connected to the side of the linkage shaft facing the support frame. A second limiting shaft is fixed on the side of the connecting plate away from the linkage shaft. A second limiting hole adapted to the second limiting shaft is opened on the support frame, and the second limiting shaft is slidably connected inside the second limiting hole.

[0016] Preferably, an outer cylinder is sleeved on the outside of the second limiting shaft, and an annular hole adapted to the outer cylinder is provided on the side support plate. The outer wall of the outer cylinder is rotatably connected to the inner wall of the annular hole, and the end of the outer cylinder away from the linkage shaft is rotatably connected to the side wall of the connecting plate. A second sleeve is provided on the outside of the outer cylinder. A second receiving hole adapted to the second sleeve is provided on the second support plate, and the outer wall of the second sleeve is fixed to the inner wall of the second receiving hole. A third linkage block is fixed on the outer wall of the second sleeve. A spiral groove adapted to the third linkage block is provided on the inner wall of the second sleeve, and the third linkage block is slidably connected inside the spiral groove.

[0017] The beneficial effects of this invention are as follows: 1. During lifting operations, the weight of the cargo is transferred to the arc-shaped first support plate via the lifting rope, causing the first base plate to move downward along the first inner groove of the boom. This, in turn, drives the second base plate to compress the first return spring via the support block. The elastic deformation of the first return spring converts the instantaneous downward pressure on the lifting rope into elastic potential energy, achieving flexible buffering. This prevents localized stress concentration in the lifting rope due to sudden hard tension, effectively reducing the risk of rope breakage, wear, and other malfunctions. Simultaneously, the first limiting posts symmetrically arranged at the bottom of the second base plate slide in conjunction with the first limiting holes at the bottom of the boom, precisely constraining the sliding trajectory of the first support plate. This ensures stable component displacement during the buffering process, preventing increased rope wear due to swaying of the buffer mechanism, and further enhancing the reliability of the buffer protection.

[0018] 2. When the first support plate moves downward due to the pressure of the suspension rope, the second linkage block on the support block and the first linkage block on the side frame slide together through the arc-shaped surface, driving the first sleeve to slide along the support shaft axially. This, in turn, causes the bottom block and the second support plate to move closer to the first support plate. Multiple abutment shafts on the second support plate simultaneously abut against both sides of the suspension rope. Utilizing the adaptability of the arc-shaped support plate, a uniform clamping force can be formed on the suspension rope. At the same time, the abutment shaft drives the sliding block through the side support plate to compress the second return spring. The spring reaction force makes the abutment shaft tightly fit against the surface of the suspension rope. This not only adapts to suspension ropes of different diameters but also ensures stable clamping strength, allowing the suspension rope to automatically return to the center position of the first support plate and avoiding unilateral deviation.

[0019] 3. The outer cylinder is driven to slide along the axial direction of the second sleeve by the side support plate. The outer cylinder drives the linkage shaft and connecting plate to slide towards the support frame. The second limiting shaft slides in the second limiting hole. At the same time, the third linkage block slides along the extension trajectory of the spiral groove, causing the outer cylinder to rotate. This, in turn, drives the lower pressure block to rotate and applies a downward pressure to the lifting rope. This downward pressure allows the lifting rope to fit more tightly against the outer arc surface of the first support plate, further reducing the swaying and displacement of the lifting rope during the lifting process and enhancing the stability of the lifting rope. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the positioning mechanism of the present invention; Figure 3 This is a schematic diagram of the limiting component of the present invention; Figure 4 This is a schematic diagram of the structure of the driving component of the present invention; Figure 5 This is a schematic diagram of the linkage mechanism of the present invention; Figure 6 This is a schematic diagram of the spiral groove of the present invention.

[0021] In the picture: 10. Mounting frame; 11. Base frame; 12. Crane boom; 20. Positioning mechanism; 21. Buffer assembly; 2101. First support plate; 2102. First base plate; 2103. First inner groove; 2104. Second base plate; 2105. Support block; 2106. First return spring; 2107. First limiting post; 2108. First limiting hole; 22. Limiting component; 2201. Second support plate; 2202. Base block; 2203. Support frame; 2204. Abutment shaft; 2205. Side support plate; 2206. Sliding block; 2207. Slide groove; 2208. Second return spring; 23. Drive assembly; 2301. First sleeve; 2302. First receiving hole; 2303. Support shaft; 2304. Side frame; 2305. First linkage block; 2306. Second linkage block; 30. Linkage mechanism; 31. Linkage shaft; 32. Connecting plate; 33. Second limiting shaft; 34. Second limiting hole; 35. Outer cylinder; 37. Second sleeve; 38. Second receiving hole; 39. Third linkage block; 310. Spiral groove; 311. Pressing block. Detailed Implementation

[0022] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] As attached Figures 1-6 As shown, an open-type lifting hook includes a mounting frame 10, and a base frame 11 is mounted on the bottom of the mounting frame 10. In this embodiment, the mounting frame 10 and the base frame 11 are installed by bolt and nut assembly. A boom 12 is mounted on the bottom of the base frame 11. In this embodiment, the base frame 11 and the boom 12 are installed by bolt and nut assembly, and the two booms 12 are symmetrically arranged on the bottom of the base frame 11. The boom 12 has an inner groove for carrying the lifting rope, and the inner groove faces upward, and the lifting rope can be placed inside the inner groove for storage.

[0024] A positioning mechanism 20 is installed on the boom 12 to limit the position of the lifting rope, thereby maintaining the stability of the lifting rope.

[0025] The positioning mechanism 20 includes a buffer component 21, a limiting component 22, and a driving component 23. The buffer component 21 is used to buffer the lifting rope, thereby preventing the lifting rope from being subjected to rigid tension when the mounting frame 10 is raised. The driving component 23 is used to drive the limiting component 22 to limit the lifting rope, thereby preventing the lifting rope from deviating.

[0026] The buffer assembly 21 includes a first support plate 2101 capable of sliding up and down. The first support plate 2101 is arc-shaped, and its outer arc surface faces upward. The two ends of the first support plate 2101 correspond to two booms 12 respectively. The first support plate 2101 is used to support the hoisting rope. The outer arc surface of the first support plate 2101 has an anti-slip pad to increase the friction on the hoisting rope, thereby improving the stability of the hoisting rope.

[0027] The boom 12 has a first inner groove 2103 with the opening of the first inner groove 2103 facing upward. The bottom of both ends of the first support plate 2101 is fixed with a first base plate 2102, and the side wall of the first base plate 2102 is slidably connected to the inner wall of the first inner groove 2103 to limit the first support plate 2101 and maintain the stability of the first support plate 2101 when sliding up and down. A second base plate 2104 is provided on the lower side of the first base plate 2102. A support block 2105 is fixed between the top of the second base plate 2104 and the first base plate 2102. A first return spring 2106 is fixed between the bottom wall of the first inner groove 2103 and the bottom of the second base plate 2104 to support the second base plate 2104 and thus buffer the first support plate 2101 when it is pressed down.

[0028] The bottom of the second base plate 2104 is symmetrically fixed with two first limiting posts 2107, and the first limiting posts 2107 are located inside the first return spring 2106. The bottom of the boom 12 is provided with a first limiting hole 2108 that is adapted to the first limiting post 2107, and the first limiting post 2107 is slidably connected inside the corresponding first limiting hole 2108 to limit the first limiting post 2107, thereby maintaining the stability of the first support plate 2101 when sliding up and down.

[0029] The limiting component 22 includes a second support plate 2201 symmetrically arranged on both sides of the first support plate 2101. The second support plate 2201 is also arc-shaped, and the outer arc surface of the second support plate 2201 faces upward. The two ends of the second support plate 2201 correspond to the two booms 12 respectively. The bottom of the two points of the second support plate 2201 is fixed with a bottom block 2202. The side wall of the bottom block 2202 is slidably connected to the inner wall of the first inner groove 2103, and the bottom block 2202 can slide laterally inside the first inner groove 2103.

[0030] Multiple support frames 2203 arranged at equal intervals are fixed to the outer wall of the second support plate 2201. The support frames 2203 are L-shaped and are spaced apart along the arc of the second support plate 2201. An abutment shaft 2204 is provided on the side of the support frame 2203 facing the first support plate 2101 to abut against the suspension rope and limit its movement, thereby maintaining the stability of the suspension rope. The end of the abutment shaft 2204 facing the first support plate 2101 has an anti-slip pad to improve the clamping strength of the suspension rope. A side support plate 2205 is provided on the side of the abutment shaft 2204 facing the support frame 2203 to support the abutment shaft 2204 and maintain its stability.

[0031] A sliding block 2206 is provided on the side of the side support plate 2205 away from the abutment shaft 2204. The support frame 2203 has a groove 2207 on the side facing the side support plate 2205 that is adapted to the sliding block 2206. The sliding block 2206 is slidably connected inside the groove 2207 to limit the sliding block 2206 and maintain the stability of the sliding block 2206 when sliding. A second return spring 2208 is fixed between the side of the sliding block 2206 inside the groove 2207 and the inner wall of the groove 2207 to support the sliding block 2206. This facilitates the clamping of different diameter ropes by the abutment shaft 2204 and improves the clamping strength of the rope.

[0032] The drive assembly 23 includes a first sleeve 2301 disposed on a base block 2202. The base block 2202 has a first receiving hole 2302 adapted to the first sleeve 2301, and the outer wall of the first sleeve 2301 is rotatably connected to the inner wall of the corresponding first receiving hole 2302 to limit the first sleeve 2301 and maintain its stability. A support shaft 2303 is sleeved inside the first sleeve 2301. The first sleeve 2301 and the support shaft 2303 are coaxially disposed, and the outer wall of the support shaft 2303 is in contact with the inner wall of the first sleeve 2301. The first sleeve 2301 can slide along the axial direction of the support shaft 2303. The support shaft 2303 is used to support the first sleeve 2301 and maintain its stability when sliding axially.

[0033] The outer surface of the first sleeve 2301 is symmetrically fixed with two side frames 2304, and the side frames 2304 have a cavity. The support block 2105 is slidably connected inside the cavity. The inner wall of the cavity is fixed with a first linkage block 2305, and the support block 2105 corresponds one-to-one with the first linkage block 2305. A second linkage block 2306 is fixed on the side of the support block 2105 facing the first linkage block 2305, and both the second linkage block 2306 and the first linkage block 2305 have arc-shaped surfaces.

[0034] In use, first connect the crane's steel cable to the mounting frame 10 in this device, then place the cargo's lifting rope on the outer arc surface of the first support plate 2101. After the lifting rope is in place, the operator starts the crane through the control system, and the crane drives the mounting frame 10 to rise. When the mounting frame 10 rises, due to the weight of the cargo, the cargo's lifting rope applies downward pressure to the first support plate 2101. At this time, the first support plate 2101 drives the first bottom plate 2102 to move downward inside the first inner groove 2103. The first bottom plate 2102 drives the second bottom plate 2104 to move downward through the support block 2105. At this time, the second bottom plate 2104 applies downward pressure to the first return spring 2106, and the first return spring 2106 is compressed, thereby providing a buffer for the first support plate 2101. When the second bottom plate 2104 moves downward, the first limiting post 2107 slides inside the first limiting hole 2108 to maintain the stability of the first support plate 2101 when it moves downward.

[0035] As the first support plate 2101 moves downward, the arc-shaped surface of the first linkage block 2305 comes into contact with the arc-shaped surface of the second linkage block 2306. At this point, the second linkage block 2306 slides from the bottom end to the top end of the first linkage block 2305. Meanwhile, the side frame 2304 drives the first sleeve 2301 to slide along the axial direction of the support shaft 2303. The first sleeve 2301 also drives the bottom block 2202 to slide inside the first inner groove 2103. The bottom block 2202 then drives the second support plate 2201 to slide towards the first support plate 2101. At this point, the abutment shaft 2204 abuts against the surface of the suspension rope. The multiple abutment shafts 2204 on both sides of the second support plates 2201 then... When the suspension rope is clamped, it is simultaneously pushed by the two abutment shafts 2204 and will be located at the center of the first support plate 2101. As the abutment shafts 2204 continue to abut the suspension rope, the abutment shafts 2204 drive the sliding block 2206 to slide into the groove 2207 through the side support plate 2205. The sliding block 2206 compresses the second return spring 2208, so that the abutment shafts 2204 can clamp suspension ropes of different diameters. At the same time, the reaction force applied by the second return spring 2208 to the sliding block 2206 makes the abutment shafts 2204 tightly abut against the surface of the suspension rope, clamping the suspension rope to the lower limit, thereby improving the stability of the suspension rope.

[0036] The second support plate 2201 is provided with a linkage mechanism 30, which is used to press down the hoisting rope so that the hoisting rope can be tightly attached to the surface of the first support plate 2101.

[0037] The linkage mechanism 30 includes a linkage shaft 31 mounted on the support frame 2203. A pressing block 311 is fixed on the surface of the linkage shaft 31. When the linkage shaft 31 rotates, the linkage shaft 31 drives the pressing block 311 to press down on the suspension rope, thereby making the suspension rope tightly adhere to the outer arc surface of the first support plate 2101, thus improving the stability of the suspension rope.

[0038] A connecting plate 32 is rotatably connected to the side of the linkage shaft 31 facing the support frame 2203. A second limiting shaft 33 is fixed to the side of the connecting plate 32 away from the linkage shaft 31. A second limiting hole 34 adapted to the second limiting shaft 33 is provided on the support frame 2203. The second limiting shaft 33 is slidably connected inside the second limiting hole 34 to limit the second limiting shaft 33, thereby maintaining the stability of the second limiting shaft 33 when sliding.

[0039] An outer cylinder 35 is sleeved on the outside of the second limiting shaft 33. An annular hole adapted to the outer cylinder 35 is provided on the side support plate 2205. The outer wall of the outer cylinder 35 is rotatably connected to the inner wall of the annular hole. The end of the outer cylinder 35 away from the linkage shaft 31 is rotatably connected to the side wall of the connecting plate 32. A second sleeve 37 is provided on the outside of the outer cylinder 35. A second receiving hole 38 adapted to the second sleeve 37 is provided on the second support plate 2201. The second sleeve 37 and the second receiving hole 38 are coaxially arranged. The outer wall of the second sleeve 37 is fixed on the inner wall of the second receiving hole 38 to limit the second sleeve 37 and maintain the stability of the second sleeve 37.

[0040] The outer wall of the second sleeve 37 is fixed with a third linkage block 39, and the inner wall of the second sleeve 37 is provided with a spiral groove 310 that is adapted to the third linkage block 39, and the third linkage block 39 is slidably connected inside the spiral groove 310.

[0041] When the second support plate 2201 slides toward the suspension rope and the abutment shaft 2204 abuts against the surface of the suspension rope, aligning and clamping, the abutment shaft 2204 drives the outer cylinder 35 to slide along the axial direction of the second sleeve 37 via the side support plate 2205. The outer cylinder 35 drives the upper connecting plate 32 to slide toward the support frame 2203 via the linkage shaft 31. The second limiting shaft 33 slides inside the second limiting hole 34, while the third linkage block 39 slides along the extension trajectory of the spiral groove 310. At this time, the outer cylinder 35 rotates, and the outer cylinder 35 drives the lower pressure block 311 to rotate, applying downward pressure to the suspension rope so that the suspension rope can be tightly attached to the surface of the first support plate 2101, thereby improving the stability of the suspension rope.

[0042] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. An open-type lifting hook, characterized in that: Includes a mounting frame (10), the bottom of which is mounted a base frame (11), and two booms (12) are symmetrically mounted on the bottom of the base frame (11). The booms (12) have inner grooves for carrying the lifting ropes. A positioning mechanism (20) is installed on the boom (12). The positioning mechanism (20) includes a buffer assembly (21). The buffer assembly (21) includes a first support plate (2101) that can slide up and down. The two ends of the first support plate (2101) correspond to the two booms (12) respectively. The first support plate (2101) is used to support the hoisting rope. A first inner groove (2103) is opened on the boom (12). A first base plate (2102) is fixed at the bottom of both ends of the first support plate (2101). The side wall of the first base plate (2102) is slidably connected to the inner wall of the first inner groove (2103). A buffer is installed at the bottom of the first support plate (2101) to buffer the first support plate (2101).

2. The open-type lifting hook according to claim 1, characterized in that, The buffer includes a second base plate (2104) disposed on the lower side of the first base plate (2102). A support block (2105) is fixed between the top of the second base plate (2104) and the first base plate (2102). A first return spring (2106) is fixed between the inner bottom wall of the first inner groove (2103) at the bottom of the second base plate (2104) for supporting the second base plate (2104).

3. An open-type lifting hook according to claim 1, characterized in that, The positioning mechanism (20) further includes a limiting component (22), which includes a second supporting plate (2201) symmetrically arranged on both sides of the first supporting plate (2101). The second supporting plate (2201) is also arc-shaped. The two ends of the second supporting plate (2201) correspond to the two booms (12) respectively. The bottom of the two points of the second supporting plate (2201) is fixed with a bottom block (2202), and the side wall of the bottom block (2202) is slidably connected to the inner wall of the first inner groove (2103).

4. An open-type lifting hook according to claim 3, characterized in that, The outer wall of the second support plate (2201) is fixed with a plurality of support frames (2203) arranged at equal intervals, and the plurality of support frames (2203) are arranged at intervals along the arc of the second support plate (2201). The support frame (2203) is provided with an abutment shaft (2204) on the side facing the first support plate (2101) for abutting the suspension rope to limit its movement. The abutment shaft (2204) is provided with a side support plate (2205) on the side facing the support frame (2203) for supporting the abutment shaft (2204).

5. An open-type lifting hook according to claim 4, characterized in that, A sliding block (2206) is provided on the side of the side support plate (2205) away from the abutment shaft (2204). A sliding groove (2207) adapted to the sliding block (2206) is opened on the side of the support frame (2203) facing the side support plate (2205). The sliding block (2206) is slidably connected inside the sliding groove (2207) to limit the sliding block (2206). A second return spring (2208) is fixed between the side of the sliding block (2206) inside the sliding groove (2207) and the inner wall of the sliding groove (2207) to support the sliding block (2206).

6. An open-type lifting hook according to claim 4, characterized in that, The positioning mechanism (20) further includes a drive assembly (23), which includes a first sleeve (2301) disposed on a base block (2202). The base block (2202) has a first receiving hole (2302) adapted to the first sleeve (2301), and the outer wall of the first sleeve (2301) is rotatably connected to the inner wall of the corresponding first receiving hole (2302) for limiting the first sleeve (2301) to maintain the stability of the first sleeve (2301). A support shaft (2303) is sleeved inside the first sleeve (2301). The first sleeve (2301) and the support shaft (2303) are coaxially disposed, and the outer wall of the support shaft (2303) is in contact with the inner wall of the first sleeve (2301). The first sleeve (2301) can slide along the axial direction of the support shaft (2303).

7. An open-type lifting hook according to claim 6, characterized in that, The first sleeve (2301) has two side frames (2304) symmetrically fixed on its outer surface. The side frames (2304) have a cavity, and the support block (2105) is slidably connected inside the cavity. The inner wall of the cavity is fixed with a first linkage block (2305), and the support block (2105) corresponds one-to-one with the first linkage block (2305). A second linkage block (2306) is fixed on the side of the support block (2105) facing the first linkage block (2305), and both the second linkage block (2306) and the first linkage block (2305) have arc-shaped surfaces.

8. An open-type lifting hook according to claim 2, characterized in that, The bottom of the second base plate (2104) is symmetrically fixed with two first limiting posts (2107), and the first limiting posts (2107) are located inside the first return spring (2106). The bottom of the boom (12) is provided with a first limiting hole (2108) that is compatible with the first limiting post (2107), and the first limiting post (2107) is slidably connected inside the corresponding first limiting hole (2108) for limiting the first limiting post (2107).

9. An open-type lifting hook according to claim 7, characterized in that, The second support plate (2201) is provided with a linkage mechanism (30). The linkage mechanism (30) includes a linkage shaft (31) provided on the support frame (2203). A pressing block (311) is fixed on the surface of the linkage shaft (31). A connecting plate (32) is rotatably connected to the side of the linkage shaft (31) facing the support frame (2203). A second limiting shaft (33) is fixed on the side of the connecting plate (32) away from the linkage shaft (31). A second limiting hole (34) adapted to the second limiting shaft (33) is opened on the support frame (2203), and the second limiting shaft (33) is slidably connected inside the second limiting hole (34).

10. An open-type lifting hook according to claim 9, characterized in that, The outer cylinder (35) is sleeved on the outside of the second limiting shaft (33). An annular hole adapted to the outer cylinder (35) is opened on the side support plate (2205). The outer wall of the outer cylinder (35) is rotatably connected to the inner wall of the annular hole. The end of the outer cylinder (35) away from the linkage shaft (31) is rotatably connected to the side wall of the connecting plate (32). A second sleeve (37) is provided on the outside of the outer cylinder (35). A second receiving hole (38) adapted to the second sleeve (37) is opened on the second support plate (2201). The outer wall of the second sleeve (37) is fixed on the inner wall of the second receiving hole (38). A third linkage block (39) is fixed on the outer wall of the second sleeve (37). A spiral groove (310) adapted to the third linkage block (39) is opened on the inner wall of the second sleeve (37). The third linkage block (39) is slidably connected inside the spiral groove (310).

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