Adjustable lifting hook assembly of crane

Abstract

The utility model relates to an adjustable lifting hook assembly of a crane. The adjustable lifting hook assembly comprises a lifting hook pulley block connected with the crane, a lifting hook cross beam connected with the lifting hook pulley block, and lifting hooks which are connected with the lifting hook cross beam, are respectively positioned on two sides of the lifting hook cross beam and can transversely move, the first moving part and the second moving part are located in the cross beam frame and can move oppositely, and the bottoms of the first moving part and the second moving part are respectively connected with a lifting hook; the first rack is connected with the first moving part and can move transversely; the second rack is connected with the second moving part and can move transversely; the gear is rotationally connected with the side wall of the cross beam frame and meshed with the first rack and the second rack at the same time, the first rack and the second rack are located on the upper portion and the lower portion of the gear respectively, and the gear rotates to drive the first rack and the second rack to move in the opposite directions. Compared with the prior art, the distance between the lifting hooks can be adjusted, and the adjusting distances of the lifting hooks at the two ends are always kept consistent, so that goods at the two ends are balanced.

Description

Technical Field

[0001] The utility model relates to the technical field of hoisting machinery, in particular to an adjustable hook assembly for a crane. Background Art

[0002] A crane refers to a machine that vertically lifts and horizontally transports heavy objects within a certain range. During the operation of a crane, the most common component is a hook, which is one of the most common lifting tools in hoisting machinery. The hook is usually suspended on the steel wire rope of the hoisting mechanism by means of components such as a pulley block.

[0003] From the perspective of the prior art, a common hook assembly only includes a pulley block and a hook body. Most hooks are single hooks. The structure of a single hook is simple, and when lifting, the single hook bears all the weight. Prolonged use is likely to cause damage to the hook. And in rare cases, a hook group is used with two hooks jointly lifting, but the distance between the two hooks is not adjustable. In rare cases where the distance can be adjusted, the operation is troublesome. It is necessary to remove the hook and then check and install the distance to the pulley block after alignment. The operation is cumbersome. For this reason, we propose an adjustable hook assembly for a crane.

[0004] Patent publication number CN105417354A discloses a safety hook for a crane, which includes a hook frame, a hook body, and a safety hook body. A fixing plate, a guide rail, a stop block, and a travel switch C are arranged inside the hook frame. A pulley block and a motor are arranged on the hook frame. The motor is connected with a driving bevel gear, which meshes with bevel gear A and bevel gear B. A rotating rod A and a rotating rod B are respectively arranged at the central holes of bevel gear A and bevel gear B. A moving block A and a moving block B are respectively connected to the rotating rod A and the rotating rod B. The moving block A and the moving block B are respectively connected with a safety hook body. However, it is necessary to move the moving block A and the moving block B to the same distance respectively, and the operation is inconvenient. Summary of the Utility Model

[0005] The purpose of the present utility model is to overcome the defect of inconvenient adjustment of the distance between hooks in the above-mentioned prior art, and provide an adjustable hook assembly for a crane, which can make the distance between the hooks adjustable, and the adjustment distances of the hooks at both ends always remain consistent, so as to balance the goods at both ends.

[0006] The purpose of the present utility model can be realized by the following technical solutions:

[0007] An adjustable hook assembly for a crane includes a hook pulley block connected to the crane, a hook crossbeam connected to the hook pulley block, and hooks connected to the hook crossbeam and capable of moving horizontally on both sides thereof. The hook crossbeam includes:

[0008] A crossbeam frame with a hollow interior;

[0009] A first moving member and a second moving member that can move towards each other inside the crossbeam frame, with a hook connected to the bottom of each of them;

[0010] A first rack that can move horizontally and is connected to the first moving member;

[0011] A second rack that can move horizontally and is connected to the second moving member;

[0012] And a gear that is rotatably connected to the side wall of the crossbeam frame and meshes with both the first rack and the second rack at the same time. The first rack and the second rack are respectively located above and below the gear, and the rotation of the gear drives the first rack and the second rack to move in opposite directions.

[0013] Furthermore, the crossbeam frame is a square internal hollow structure.

[0014] Furthermore, the gear is located at the central position of the crossbeam frame, and the hook pulley block is located directly above the gear.

[0015] Furthermore, tooth openings are provided on the opposite sides of the first rack and the second rack. Each tooth opening is of equal size and evenly arranged, so that the first rack and the second rack can move the same distance when rotating through the gear.

[0016] Furthermore, a first slide rail for the first moving member to move horizontally and a second slide rail for the second moving member to move horizontally are provided inside the hook crossbeam;

[0017] The first slide rail and the second slide rail are on the same horizontal line and are not connected. Their mutually remote ends are connected to the inner walls at both ends of the crossbeam frame.

[0018] Even further, the first moving member is of a T-shaped structure, including a first horizontal portion and a first vertical portion connected vertically. There is a first opening in the middle of the first slide rail for the first vertical portion to pass through, and first tracks for the first horizontal portion to slide are provided on both sides of the first opening;

[0019] The second moving member is of a T-shaped structure, including a second horizontal portion and a second vertical portion connected vertically. There is a second opening in the middle of the second slide rail for the second vertical portion to pass through, and second tracks for the second horizontal portion to slide are provided on both sides of the second opening.

[0020] Even further, transverse chutes are provided on both sides of the crossbeam frame, and the chutes are located below the slide rails;

[0021] First auxiliary sliding plates that move along the chutes are provided on both sides of the first moving member;

[0022] Second auxiliary sliding plates that move along the sliding groove are arranged on both sides of the second moving part.

[0023] Furthermore, the first auxiliary sliding plate is integrally formed with the first moving part, and the second auxiliary sliding plate is integrally formed with the second moving part.

[0024] Further, the first moving part is connected to the first rack through a first connecting rod, and the second moving part is connected to the second rack through a second connecting rod.

[0025] Furthermore, the first connecting rod and the second connecting rod are L-shaped;

[0026] The first connecting rod includes a first horizontal moving rod connected to the first moving part and a first vertical connecting rod connected to the first rack. The first horizontal moving rod is perpendicularly connected to the first vertical connecting rod, and the height of the first horizontal moving rod is lower than that of the first rack;

[0027] The second connecting rod includes a second horizontal moving rod connected to the second moving part and a second vertical connecting rod connected to the second rack. The second horizontal moving rod is perpendicularly connected to the second vertical connecting rod, and the height of the second horizontal moving rod is higher than that of the second rack.

[0028] Furthermore, the first horizontal moving rod and the second horizontal moving rod have the same height.

[0029] Furthermore, a first support frame and a second support frame through which the first connecting rod and the second connecting rod respectively pass are connected to the inner top wall of the crossbeam frame. A through hole through which the first rack passes is also arranged on the second support frame; and the first support frame and the second support frame are located on one side of the first rack and the second rack.

[0030] Furthermore, the bottoms of the first support frame and the second support frame are of annular structures for the first connecting rod and the second connecting rod to pass through respectively.

[0031] Furthermore, the first support frame and the second support frame are symmetrically distributed with respect to the vertical line passing through the center of the gear.

[0032] Further, the first connecting rod and the second connecting rod are of equal length, the first rack and the second rack are of equal length, the length of the first connecting rod is longer than the length of the second rack, and the length of the second connecting rod is longer than the length of the first rack.

[0033] Furthermore, the first rack is integrally formed with the first connecting rod, and the second rack is integrally formed with the second connecting rod.

[0034] Further, a rotating shaft is fixedly connected to the gear, passing through the side wall of the crossbeam frame and being rotatable, and a rotating handle is connected to the outer end of the rotating shaft.

[0035] Furthermore, the gear, the rotating shaft, and the rotating handle are integrally formed.

[0036] Further, a transverse notch is provided at the bottom of the crossbeam frame, and the upper parts of the first moving member and the second moving member are placed inside the crossbeam frame, and the lower parts pass through the notch and are placed outside the crossbeam frame.

[0037] Further, the hook is connected to the first moving member or the second moving member through a connecting member, and the connecting member includes a hook bracket fixedly connected to the bottom of the first moving member or the second moving member respectively, a base platform with the bottom rotatably connected to the hook, and a cross bar passing through and connecting the hook bracket and the base platform.

[0038] Furthermore, the upper part of the base platform is located inside the hook bracket and is connected by a transverse cross bar.

[0039] Further, the hook includes a hook body in a hook shape, a baffle rotatably connected to the hook body and located at its opening, and a pull ring connected to the baffle and used to pull the baffle to rotate.

[0040] Furthermore, the baffle and the pull ring are integrally formed.

[0041] Furthermore, the upper end of the baffle is rotatably connected to the upper end of the hook body.

[0042] Furthermore, the pull ring is located on both sides of the hook body.

[0043] Compared with the prior art, the utility model has the following advantages:

[0044] (1) The structure of the utility model is reasonable. By driving the rotating shaft and the gear to rotate through the rotating handle, since the upper and lower sides of the gear are respectively engaged with the first rack and the second rack, and the first rack and the second rack are respectively connected to the first moving member and the second moving member and can move horizontally within the crossbeam frame, the rotation of the gear can be converted into the horizontal movement of the first rack and the second rack. And because the first rack and the second rack correspond to each other, the moving distances of the first moving member and the second moving member are the same, driving the hooks respectively connected to the first moving member and the second moving frame to move in opposite directions at the same time, achieving the purpose of adjusting the distance between the two hooks, which is convenient, fast, and simple to operate, and can always keep the distances between the two hooks and the gear equal, thus maintaining balance on both sides.

[0045] (2) In the present utility model, the hook body is rotatably connected to the base, achieving the purpose that the hook body can rotate, and can be adjusted according to the lifting direction of the crane.

[0046] (3) In the present utility model, inside the crossbeam frame, the cooperation of the first moving member and the first sliding rail, the cooperation of the second moving member and the second sliding rail, and the cooperation of the first auxiliary sliding plate and the second auxiliary sliding plate with the sliding groove are utilized. While the first moving member and the second moving member slide, the contact between them and the crossbeam frame is increased, improving stability and safety. Moreover, a baffle for preventing hook detachment is installed on the hook body, and a pull ring is fixedly connected to one side of the baffle. When lifting goods, the baffle is used for shielding to prevent unhooking. When the goods are placed, the pull ring is lifted, causing the baffle to rotate, facilitating the detachment of the goods from the hook body. Description of the Drawings

[0047] Figure 1 Schematic diagram of the overall structure of the adjustable hook assembly shown in Embodiment 1;

[0048] Figure 2 Schematic diagram of the overall structure of the adjustable hook assembly shown in Embodiment 1 from another angle;

[0049] Figure 3 Schematic diagram of the hook crossbeam shown in Embodiment 1;

[0050] Figure 4 Side view cross-sectional view of the hook crossbeam shown in Embodiment 1;

[0051] Figure 5 Cross-sectional view of the hook crossbeam shown in Embodiment 1;

[0052] Figure 6 For Figure 5 Enlarged schematic diagram of the structure at A in

[0053] Explanation of the marks in the figure:

[0054] 1 - Hook pulley block, 11 - Pulley;

[0055] 2 - Hook crossbeam, 21 - Crossbeam frame, 211 - Notch, 212 - First support bracket, 213 - Second support bracket, 2131 - Through hole, 22 - First moving part, 221 - First auxiliary slide plate, 222 - First horizontal part, 223 - First vertical part, 23 - Second moving part, 231 - Second auxiliary slide plate, 232 - Second horizontal part, 233 - Second vertical part, 24 - First rack, 241 - First connecting rod, 2411 - First horizontal connecting rod, 2412 - First vertical connecting rod, 25 - Second rack, 251 - Second connecting rod, 2511 - Second horizontal connecting rod, 2512 - Second vertical connecting rod, 26 - Gear, 261 - Rotating shaft, 262 - Rotating handle, 27 - First slide rail, 28 - Second slide rail, 29 - Chute;

[0056] 3 - Hook, 31 - Hook body, 32 - Baffle, 33 - Pulling ring;

[0057] 4 - Connecting piece, 41 - Hook rack, 42 - Base, 43 - Cross bar. Detailed implementation mode

[0058] The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments are implemented on the premise of the technical solution of the present utility model, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present utility model is not limited to the following embodiments. In the following embodiments or implementation manners, if there is no special description of functional components or structures, it indicates that they are all conventional components or conventional structures adopted in the art to achieve corresponding functions.

[0059] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0060] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0061] Embodiment 1

[0062] As Figures 1 to 6 shown, an adjustable hook assembly for a crane includes a hook pulley block 1 connected to the crane, a hook crossbeam 2 connected to the hook pulley block 1, and hooks 3 that are connected to the hook crossbeam 2 and can move horizontally on both sides thereof. The hook crossbeam 2 includes:

[0063] A crossbeam frame 21 with a hollow interior;

[0064] A first moving member 22 and a second moving member 23 that are located inside the crossbeam frame 21 and can move towards each other, and a hook 3 is respectively connected to the bottom of each of them;

[0065] A first rack 24 that is connected to the first moving member 22 and can move horizontally;

[0066] A second rack 25 that is connected to the second moving member 23 and can move horizontally;

[0067] And a gear 26 that is rotatably connected to the side wall of the crossbeam frame 21 and meshes with both the first rack 24 and the second rack 25 at the same time. The first rack 24 and the second rack 25 are respectively located above and below the gear 26, and the rotation of the gear 26 drives the first rack 24 and the second rack 25 to move in opposite directions.

[0068] In this embodiment, the crossbeam frame 21 has a square hollow structure.

[0069] In this embodiment, the gear 26 is located at the center of the crossbeam frame 21, and the hook pulley block 1 is located directly above the gear 26.

[0070] In this embodiment, tooth openings are provided on both opposite sides of the first rack 24 and the second rack 25. The size of each tooth opening is equal and they are arranged evenly, so that the first rack 24 and the second rack 25 can move the same distance when rotating through the gear.

[0071] In this embodiment, a first slide rail 27 for the horizontal movement of the first moving member 22 and a second slide rail 28 for the horizontal movement of the second moving member 23 are provided inside the hook crossbeam 2;

[0072] The first slide rail 27 and the second slide rail 28 are on the same horizontal line and are not connected. The ends where they are away from each other are connected to the inner walls at both ends of the crossbeam frame 21.

[0073] In this embodiment, the first moving member 22 has a T-shaped structure, including a first horizontal portion 222 and a first vertical portion 223 that are vertically connected. There is a first opening in the middle of the first slide rail 27 for the first vertical portion 223 to pass through, and first tracks for the first horizontal portion 222 to slide on both sides of the first opening.

[0074] The second moving member 23 has a T-shaped structure, including a second horizontal portion 232 and a second vertical portion 233 that are vertically connected. There is a second opening in the middle of the second slide rail 28 for the second vertical portion 233 to pass through, and second tracks for the second horizontal portion 232 to slide on both sides of the second opening.

[0075] In this embodiment, transverse chutes 29 are provided on both sides of the crossbeam frame 21, and the chutes 29 are located below the slide rails 27.

[0076] First auxiliary sliding plates 221 for moving along the chutes 29 are provided on both sides of the first moving member 22.

[0077] Second auxiliary sliding plates 231 for moving along the chutes 29 are provided on both sides of the second moving member 23.

[0078] In this embodiment, the first auxiliary sliding plate 211 is integrally formed with the first moving member 22, and the second auxiliary sliding plate 231 is integrally formed with the second moving member 23.

[0079] In this embodiment, the first moving member 22 is connected to the first rack 24 through a first connecting rod 241, and the second moving member 23 is connected to the second rack 25 through a second connecting rod 251.

[0080] In this embodiment, the first connecting rod 241 and the second connecting rod 251 are L-shaped.

[0081] The first connecting rod 241 includes a first horizontal moving rod 2411 connected to the first moving member 22, and a first vertical connecting rod 2412 connected to the first rack 24. The first horizontal moving rod 2411 is vertically connected to the first vertical connecting rod 2412, and the height of the first horizontal moving rod 2411 is lower than that of the first rack 24.

[0082] The second connecting rod 251 includes a second horizontal moving rod 2511 connected to the second moving member 23, and a second vertical connecting rod 2512 connected to the second rack 25. The second horizontal moving rod 2511 is vertically connected to the second vertical connecting rod 2512, and the height of the second horizontal moving rod 2511 is higher than that of the second rack 25.

[0083] In this embodiment, the first lateral moving rod 2411 and the second lateral moving rod 2511 are at the same height.

[0084] In this embodiment, the inner top wall of the crossbeam frame 21 is connected with a first support frame 212 and a second support frame 213 respectively for the first connecting rod 241 and the second connecting rod 251 to pass through. A through hole 2131 for the first rack 24 to pass through is further provided on the second support frame 213; and the first support frame 212 and the second support frame 213 are located on one side of the first rack 24 and the second rack 25.

[0085] In this embodiment, the bottoms of the first support frame 212 and the second support frame 213 are of an annular structure for the first connecting rod 241 and the second connecting rod 251 to pass through respectively.

[0086] In this embodiment, the first support frame 212 and the second support frame 213 are symmetrically distributed with respect to the vertical line passing through the center of the circle of the gear 26.

[0087] In this embodiment, the first connecting rod 241 and the second connecting rod 251 are of equal length, the first rack 24 and the second rack 25 are of equal length, the length of the first connecting rod 241 is longer than the length of the second rack 25, and the length of the second connecting rod 251 is longer than the length of the first rack 24.

[0088] In this embodiment, the first rack 24 and the first connecting rod 241 are integrally formed, and the second rack 25 and the second connecting rod 251 are integrally formed.

[0089] In this embodiment, a rotating shaft 261 that passes through the side wall of the crossbeam frame 21 and can rotate is fixedly connected to the gear 26, and a rotating handle 262 is connected to the outer end of the rotating shaft 261.

[0090] In this embodiment, the gear 26, the rotating shaft 261, and the rotating handle 262 are integrally formed.

[0091] In this embodiment, a lateral notch 211 is provided at the bottom of the crossbeam frame 21. The upper parts of the first moving member 22 and the second moving member 23 are placed inside the crossbeam frame 21, and the lower parts pass through the notch 211 and are placed outside the crossbeam frame 21.

[0092] In this embodiment, the hook 3 is connected to the first moving member 22 or the second moving member 23 through a connecting member 4. The connecting member 4 includes a hook frame 41 fixedly connected to the bottom of the first moving member 22 or the second moving member 23 respectively, a base 42 with its bottom rotatably connected to the hook 3, and a cross bar 43 passing through and connecting the hook frame 41 and the base 42. The upper part of the base 42 is located within the hook frame 41 and is connected by the horizontal cross bar 43.

[0093] In this embodiment, the hook 3 includes a hook body 31 in a hook shape, a baffle 32 rotatably connected to the hook body 31 and located at its opening, and a pull ring 33 connected to the baffle 32 and used to pull the baffle 32 to rotate.

[0094] In this embodiment, the baffle 32 and the pull ring 33 are integrally formed.

[0095] In this embodiment, the upper end of the baffle 32 is rotatably connected to the upper end of the hook body 31.

[0096] In this embodiment, the pull ring 33 is located on both sides of the hook body 31.

[0097] In this embodiment, the hook pulley block 1 is connected to a crane for lifting. The hook pulley block 1 includes a pulley 11, and the steel wire of the crane passes around the pulley 11 to raise or lower the hook assembly.

[0098] In this embodiment, the working process and working principle of the adjustable hook assembly of the crane are as follows:

[0099] Pull the baffle 32 through the pull ring 33 to make it rotate, exposing the opening of the hook body 31. Place the goods in the two hook bodies 31 respectively. After loading the goods, pull the pull ring 33 to close the baffle 32 with the hook body 31, and use the baffle 32 for shielding to prevent the goods from being unhooked. The hook body 31 is rotatably connected to the base 42 to achieve the purpose that the hook body 31 can rotate, so that the hook body 31 can be adjusted according to the lifting direction of the crane.

[0100] After the goods are loaded, the crane pulls the goods up or down through the hook pulley block 1. By rotating the rotating handle 262, the rotating shaft 261 and the gear 26 are driven to rotate. Since the gear 26 meshes with the upper first rack 24 and the lower second rack 25, the first rack 24 and the second rack 25 are driven to move horizontally in opposite directions by the same distance at the same time, so that the first moving member 22 drives the first hook 31 to move along the first slide rail 27, and the second moving member 23 drives the second hook 32 to move along the second slide rail 28, and the first auxiliary slide plate 221 and the second auxiliary slide plate 231 can move along the slide grooves 29 on both inner walls of the cross beam frame 21, increasing the contact between the first moving member 22 and the second moving member 23 and the cross beam frame 21, and improving the stability and safety. When moving, the two hooks 3 move the same distance and in opposite directions. Therefore, the hook assembly can control the distance between the two hooks 3 and keep the distance from the two hooks 3 to the gear 26 always consistent, so as to always maintain balance during the lifting process. Its operation is simple, convenient and fast. When reaching the designated position, the baffle 32 is pulled by the pull ring 33 to rotate, exposing the opening of the hook body 31, and the goods are taken out.

[0101] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present utility model is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art according to the disclosure of the present utility model without departing from the scope of the present utility model should be within the protection scope of the present utility model.

Claims

1. An adjustable hook assembly for a crane, characterized in that, It includes a hook pulley block (1) connected to a crane, a hook crossbeam (2) connected to the hook pulley block (1), and hooks (3) connected to the hook crossbeam (2) and capable of lateral movement on both sides thereof. The hook crossbeam (2) includes: A crossbeam frame (21) with a hollow interior; A first moving member (22) and a second moving member (23) located inside the crossbeam frame (21) and capable of moving towards each other, with a hook (3) connected to the bottom of each of them; A first rack (24) connected to the first moving member (22) and capable of lateral movement; A second rack (25) connected to the second moving member (23) and capable of lateral movement; And a gear (26) rotatably connected to the side wall of the crossbeam frame (21) and meshing with both the first rack (24) and the second rack (25) simultaneously. The first rack (24) and the second rack (25) are respectively located above and below the gear (26). The rotation of the gear (26) drives the first rack (24) and the second rack (25) to move in opposite directions.

2. The adjustable hook assembly of a crane according to claim 1, characterized in that, The gear (26) is located at the central position of the crossbeam frame (21), and the hook pulley block (1) is located directly above the gear (26); Inside the hook crossbeam (2), there are a first slide rail (27) for the lateral movement of the first moving member (22) and a second slide rail (28) for the lateral movement of the second moving member (23); The first slide rail (27) and the second slide rail (28) are on the same horizontal line and not connected, and their mutually remote ends are connected to the inner walls at both ends of the crossbeam frame (21).

3. An adjustable hook assembly for a crane according to claim 2, characterized in that, On both sides of the crossbeam frame (21), there are horizontal chutes (29), and the chutes (29) are located below the slide rails (27); On both sides of the first moving member (22), there are first auxiliary sliding plates (221) that move along the chutes (29); On both sides of the second moving member (23), there are second auxiliary sliding plates (231) that move along the chutes (29).

4. An adjustable hook assembly for a crane according to claim 1, characterized in that, The first moving member (22) is connected to the first rack (24) through a first connecting rod (241), and the second moving member (23) is connected to the second rack (25) through a second connecting rod (251).

5. An adjustable hook assembly for a crane according to claim 4, characterized in that, The inner top wall of the crossbeam frame (21) is connected with a first support frame (212) and a second support frame (213) through which the first connecting rod (241) and the second connecting rod (251) respectively pass. A through hole (2131) for the first rack (24) to pass through is also provided on the second support frame (213); and the first support frame (212) and the second support frame (213) are located on one side of the first rack (24) and the second rack (25).

6. The adjustable hook assembly of a crane according to claim 4, characterized in that, The lengths of the first connecting rod (241) and the second connecting rod (251) are equal, the lengths of the first rack (24) and the second rack (25) are equal, the length of the first connecting rod (241) is longer than the length of the second rack (25), and the length of the second connecting rod (251) is longer than the length of the first rack (24).

7. An adjustable hook assembly for a crane according to claim 1, characterized in that, A rotating shaft (261) fixedly connected to the gear (26) passes through the side wall of the cross beam frame (21) and is rotatable, and a rotating handle (262) is connected to the outer end of the rotating shaft (261).

8. An adjustable hook assembly for a crane according to claim 1, characterized in that, A transverse notch (211) is provided at the bottom of the cross beam frame (21), the upper parts of the first moving member (22) and the second moving member (23) are placed inside the cross beam frame (21), and the lower parts pass through the notch (211) and are placed outside the cross beam frame (21).

9. The adjustable hook assembly of a crane according to claim 1, characterized in that, The hook (3) is respectively connected to the first moving member (22) or the second moving member (23) through a connecting member (4), and the connecting member (4) includes a hook bracket (41) fixedly connected to the bottom of the first moving member (22) or the second moving member (23) respectively, a base (42) whose bottom is rotatably connected to the hook (3), and a cross bar (43) passing through and connecting the hook bracket (41) and the base (42).

10. The adjustable hook assembly of a crane according to claim 1, characterized in that, The hook (3) includes a hook-shaped hook body (31), a baffle (32) rotatably connected to the hook body (31) and located at its opening, and a pull ring (33) connected to the baffle (32) and used to pull the baffle (32) to rotate.

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