CN211470607U - Lifting structure and crane - Google Patents

Abstract

The embodiment of the utility model provides a pull up structure and hoist relates to the hoist field. Aims to solve the problem that the prior fly jib mast is inconvenient to disassemble and assemble. The turning structure comprises a support frame, the support frame comprises a first end and a second end which are arranged at intervals, and the first end is used for being connected to a first preset position of the fly jib mast; the first pulling piece is connected with the second end and the winch; the second pulling piece is connected with the second end and a second preset position on the fly jib mast; under the pulling action of the winch, the support frame keeps balance between the first pulling part and the second pulling part, and a connecting line among the second end, the first preset position and the second preset position forms a triangle. Through the first pulling piece of hoist pulling, first pulling piece pulling strut and pulling second pulling piece, up to pulling the fly jib mast or put down, accomplish the dismouting of fly jib mast, compare whole regulation that relies on auxiliary crane to accomplish mounted position and angle, pull up the structure and can make things convenient for the dismouting of fly jib mast.

Description

Lifting structure and crane

Technical Field

The utility model relates to a hoist field particularly, relates to and pulls up structure and hoist.

Background

At present, most parts on the crane have larger mass and volume, and how to improve the convenience of disassembly and assembly becomes an important problem to be faced in the design and use process of the crane. Wherein, the dismouting of fly jib mast has the inconvenient problem of dismouting.

SUMMERY OF THE UTILITY MODEL

The objects of the present invention include, for example, providing a cocking structure that can improve the problem of the inconvenience of the disassembly and assembly of the existing fly jib mast.

The purpose of the utility model is still to include, provide a crane, it can improve the inconvenient problem of current fly jib mast dismouting.

The embodiment of the utility model discloses a can realize like this:

the embodiment of the utility model provides a pull up structure for pull the fly jib mast and rotate around the fly jib, the fly jib mast is articulated with the fly jib, pulls up the structure and includes:

the strut comprises a first end and a second end which are arranged at intervals, and the first end is used for being connected to a first preset position of the fly jib mast;

the first pulling piece is connected with the second end and a winch of the crane;

the second pulling piece is connected with the second end and a second preset position on the fly jib mast;

under the pulling action of the winch, the support frame keeps balance between the first pulling part and the second pulling part, and a connecting line among the second end, the first preset position and the second preset position forms a triangle.

In addition, the embodiment of the present invention provides a cocking structure that can also have the following additional technical features:

the first pulling piece comprises a first steel wire rope, one end of the first steel wire rope is connected to the auxiliary arm, and the other end of the first steel wire rope bypasses the second end and is connected to the winch.

Optionally: the first pulling piece also comprises a movable pulley connected to the second end;

one end of the first steel wire rope is fixed on the auxiliary arm, and the other end of the first steel wire rope is connected to the winch by bypassing the movable pulley.

Optionally: the first pulling piece also comprises a connecting rod;

one end of the connecting rod is hinged to the second end, and the movable pulley is arranged at one end, far away from the second end, of the connecting rod.

Optionally: the second pulling piece comprises at least one of a pulling plate, a second steel wire rope and a chain;

the second pulling member is connected between the second end and a second predetermined position.

Optionally: the second pulling piece adopts a pulling plate;

one end of the pulling plate is hinged to the second end, and the other end of the pulling plate is hinged to the second preset position.

Optionally: the first end is hinged at a first preset position.

Optionally: the strut also comprises a connecting shaft arranged at the second end, and the connecting shaft extends along the width direction of the fly jib mast;

the first pulling piece is connected to the middle part of the connecting shaft;

the number of the second pulling parts is two, the two second pulling parts are connected to the connecting shaft, and the connecting positions are symmetrically distributed relative to the middle of the connecting shaft.

Optionally: the strut also comprises a first strut and a second strut which are arranged side by side;

one end of the first support rod and one end of the second support rod are connected to two ends of the connecting shaft respectively, and one ends, far away from the connecting shaft, of the first support rod and the second support rod are connected to a first preset position respectively.

An embodiment of the utility model also provides a crane, including the structure of wrenching.

The utility model discloses the beneficial effect of having wrenched structure and hoist includes, for example:

the structure of having pulled up is in the use, through the first pulling piece of hoist engine pulling, first pulling piece pulling strut and pulling second pulling piece, first pulling piece and second pulling piece make the strut keep balance between the two after launching jointly, the hoist engine continues the pulling, up to having pulled up or put down the fly jib mast, accomplishes the dismouting of fly jib mast, compare present fly jib mast whole journey and pull up and put down according to the auxiliary crane, the utility model discloses a pull up structure work efficiency is higher, requires greatly reduced to the lifting load of auxiliary crane, can accomplish the dismouting work of fly jib mast in shorter time with less auxiliary crane promptly, has improved the dismouting efficiency of fly jib mast.

The hoist, including foretell structure of cocking, utilize the plate-lifting structure to cock the fly jib mast or put down, compare present fly jib mast whole journey and cock and put down according to auxiliary crane, the utility model discloses a structure work efficiency of cocking is higher, requires greatly reduced to auxiliary crane's lifting capacity, can accomplish the dismouting work of fly jib mast in shorter time with less auxiliary crane promptly, has improved the dismouting efficiency of fly jib mast.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a use state of a cocking structure according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a part of a structure connected to an auxiliary boom mast in a wrenching structure according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a part of a structure connected to an auxiliary boom mast in a wrenching structure according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a use state of the cocking structure according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a use state of the cocking structure according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a use state of the cocking structure according to an embodiment of the present invention.

Icon: 20-a secondary arm; 40-a fly jib mast; 41-a first preset position; 42-a second preset position; 50-a hinge axis; 60-a cocking configuration; 100-a support frame; 101-a first end; 102-a second end; 110-a connecting shaft; 120-a first brace bar; 130-a second brace bar; 200-a first pulling member; 210-a first wire rope; 220-a connecting rod; 230-a stent; 240-a movable pulley; 300-a second pulling member; 310-a second steel cord; 320-pulling plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that, in the case of conflict, the features of the embodiments of the present invention may be combined with each other.

The tower fly jib mast of hoist often needs to be assembled the fly jib mast on ground and then to be hung to corresponding position and assemble through supplementary crane in the installation, needs the supplementary crane of great load lifting usually to need the comparatively accurate operation of supplementary crane with position and the angle of adjustment installation, waste time and energy, it is higher to the operating requirement of supplementary crane, there is the inconvenient problem of dismouting in the fly jib mast dismouting, the structure of pulling up and hoist that this embodiment provided can improve this technical problem.

The cocking structure 60 provided in the present embodiment will be described in detail with reference to fig. 1 to 6.

Referring to fig. 1, a cocking structure 60 according to an embodiment of the present invention is used for cocking an auxiliary boom mast 40 to rotate around an auxiliary boom 20, the auxiliary boom mast 40 is hinged to the auxiliary boom 20, and the cocking structure 60 includes: the strut 100 comprises a first end 101 and a second end 102 which are arranged at intervals, wherein the first end 101 is used for being connected to a first preset position 41 of the fly jib mast 40; the first pulling part 200, the first pulling part 200 is connected with the second end 102 and the winch of the crane; a second pulling member 300, the second pulling member 300 connecting the second end 102 and the second predetermined position 42 on the jib mast 40; under the pulling action of the winch, the bracket 100 keeps balance between the first pulling part 200 and the second pulling part 300, and a connecting line between the second end 102, the first preset position 41 and the second preset position 42 forms a triangle.

Referring to fig. 1, in the present embodiment, one end of the fly jib mast 40 is hinged to the fly jib 20, the pulling structure 60 is connected to the fly jib mast 40 and the fly jib 20, and the fly jib mast 40 is pulled to swing up and down around the hinged position of the fly jib mast 40 and the fly jib 20 by pulling the first pulling member 200, the support frame 100 and the second pulling member 300 until a desired angle is reached, so as to facilitate the disassembly and assembly of the fly jib mast 40. The turning up structure 60 provided in this embodiment can also be used to turn other mechanisms.

In the present embodiment, the first preset position 41 and the second preset position 42 are provided at intervals in the longitudinal direction of the fly jib mast 40. "the length of the fly jib mast 40" refers to the direction indicated by the arrow a in fig. 1; to describe the relative position in fig. 1, the jib mast 40 is laid out in the lateral direction, and the length direction of the jib mast 40 is a direction from the left end to the right end or a direction from the right end to the left end. In this embodiment, the first end 101 and the second end 102 of the bracket 100 are located at two ends of the bracket 100 in the length direction, and in this embodiment, the "length direction of the bracket 100" refers to the direction indicated by the arrow B in fig. 1; referring to the relative position of fig. 1, the bracket 100 is oriented vertically, with the first end 101 at the top end of the bracket 100 and the second end 102 at the bottom end of the bracket 100. In the embodiment, the first end 101 is hinged at the first predetermined position 41, the support frame 100 can swing relative to the fly jib mast 40, and the relative positions in fig. 1 are described, the first pulling member 200 is located at the right side of the support frame 100, the second pulling member 300 is located at the left side of the support frame 100, and the first pulling member 200 and the second pulling member 300 are expanded to keep the support frame 100 stable. In other embodiments, the first end 101 may also be fixed at the first predetermined position 41, the first pulling member 200 pulls the bracket 100, and the second pulling member 300 is used for balancing the stress on the bracket 100.

The whole implementation process is as follows: the support frame 100 is erected and then released by using an auxiliary crane, then the winch pulls the first pulling piece 200, the first pulling piece 200 pulls the support frame 100, the support frame 100 pulls the second pulling piece 300, under the action of the first pulling piece 200 and the second pulling piece 300, the support frame 100 is in a balanced state, a connecting line between the second end 102, the first preset position 41 and the second preset position 42 forms a triangle, and the winch continues to pull, so that the auxiliary arm mast 40 connected with the support frame 100 and the second pulling piece 300 can be pulled up, and the auxiliary arm mast 40 rotates around the hinged shaft.

Compared with the prior art that the angle and the position of the fly jib mast 40 are mounted and adjusted by an auxiliary crane in the whole dismounting process, the position and the angle of the fly jib mast 40 are adjusted by pulling the structure 60, so that the workload of the auxiliary crane is reduced, the operation difficulty and the workload of dismounting and mounting the fly jib mast 40 are reduced, and the dismounting and mounting of the fly jib mast 40 are facilitated.

Referring to fig. 2, in the present embodiment, the support frame 100 further includes a connecting shaft 110 disposed at the second end 102, and the connecting shaft 110 extends along the width direction of the fly jib mast 40; the first pulling member 200 is connected to the middle of the connecting shaft 110; the number of the second pulling members 300 is two, and the two second pulling members 300 are both connected to the connecting shaft 110, and the connecting positions are symmetrically distributed relative to the middle of the connecting shaft 110. The first pulling member 200 connects the middle of the connecting shaft 110 and the winding machine. The two second pulling members 300 are disposed side by side and both connect the connecting shaft 110 and the second predetermined position 42. The connection position of the first pulling member 200 and the connecting shaft 110 is located between the connection positions of the two second pulling members 300 and the connecting shaft 110. Similarly, the number of the first pulling members 200 may be multiple, the number of the second pulling members 300 may also be increased, the connection positions of the plurality of first pulling members 200 and the connecting shaft 110 are all located in the middle of the connection positions of the plurality of second pulling members 300 and the connecting shaft 110, the plurality of second pulling members 300 are equally divided into two parts and are respectively connected with the connecting shaft 110, and the connection positions of the two parts and the connecting shaft 110 are symmetrical with respect to the middle of the connecting shaft 110.

Referring to fig. 2, in the present embodiment, the supporting frame 100 further includes a first supporting rod 120 and a second supporting rod 130 arranged side by side; one end of the first stay 120 and one end of the second stay 130 are respectively connected to two ends of the connecting shaft 110, and one ends of the first stay 120 and the second stay 130, which are far away from the connecting shaft 110, are respectively connected to the first preset position 41. Specifically, one end of the first stay 120 and one end of the second stay 130 are hinged or welded to both ends of the connecting shaft 110, respectively.

Specifically, one end of the first stay 120 is hinged to one end of the connecting shaft 110, and the other end of the first stay 120 is hinged to the first preset position 41; one end of the second stay 130 is hinged to the end of the connecting shaft 110 not hinged to the first stay 120, the other end of the second stay 130 is hinged to the first preset position 41, and the first stay 120 and the second stay 130 are arranged side by side at intervals. The first and second braces 120 and 130 are used for maintaining the stability of the connecting shaft 110 while enhancing the connecting strength of the connecting shaft 110 and the fly jib mast 40. Similarly, several brace rods may be provided, one end of each brace rod is hinged to the connecting shaft 110, and the other end of each brace rod is hinged to the first preset position 41.

Referring to fig. 1 again, in the present embodiment, the first pulling member 200 includes a first cable 210, one end of the first cable 210 is connected to the sub-boom 20, and the other end of the first cable 210 is connected to the winch by bypassing the second end 102. The winch winds the first wire rope 210 to pull the strut 100, thereby pulling the second pulling member 300, and thus the jib mast 40. The first steel wire rope 210 is adapted to the winding machine, and similarly, the first steel wire rope 210 may be replaced by a pulling plate, a pulling cable, a chain, or the like.

Referring to fig. 2 in conjunction with fig. 1, in the present embodiment, the first pulling member 200 further includes a movable pulley 240 connected to the second end 102; one end of the first wire rope 210 is fixed to the sub-boom 20, and the other end of the first wire rope 210 is connected to the hoist by passing around the movable sheave 240. One end of the first wire rope 210 is fixed, and may be fixed to the jib mast 40, or may be fixed to a position other than the jib mast 40, for example, a lifting lug of the jib 20, and the other end of the first wire rope 210 is connected to a winch by passing over the movable sheave 240. By adopting the movable pulley 240, the first steel wire rope 210 is changed from single-rate to double-rate, the effective tension is larger, and enough tension is provided to pull the support frame 100. The movable pulley 240 may be directly provided on the connecting shaft 110. In this embodiment, the number of the movable pulleys 240 is one, and in order to increase the effective tension, a plurality of pulleys may be additionally provided, the plurality of pulleys are arranged side by side, the number of the first steel wire ropes 210 is correspondingly increased, one first steel wire rope 210 is wound around one pulley, one end of each of the plurality of first steel wire ropes 210 is fixed to the sub-boom 20, and the other end thereof is wound around the winch.

Referring to fig. 2, in conjunction with fig. 1, in the present embodiment, the first pulling member 200 further includes a connecting rod 220; one end of the connecting rod 220 is hinged on the second end 102, and the movable pulley 240 is arranged at one end of the connecting rod 220 far away from the second end. Specifically, one end of the connecting rod 220 is hinged on the connecting shaft 110, and the other end of the connecting rod 220 is provided with a movable pulley 240, and more specifically, one end of the connecting rod 220 provided with the movable pulley 240 is provided with a bracket 230, specifically, a U-shaped frame, and the movable pulley 240 is rotatably provided on the U-shaped frame. In this embodiment, the movable pulley 240 is hinged to the bracket 100 through the connecting rod 220. Specifically, one end of the connecting rod 220, which is not connected to the movable pulley 240, is provided with a first circular ring, and the first circular ring is movably sleeved on the periphery of the connecting shaft 110.

Referring again to fig. 1, in the present embodiment, the second pulling member 300 includes at least one of a pulling plate 320, a second wire rope 310, and a chain; the second pulling member 300 is coupled between the second end 102 and the second predetermined position 42. The pulling plate 320, the second wire rope 310 and the chain may be replaced with each other, or combined two by two, or connected together. In this embodiment, the second pulling member 300 is a pulling plate 320; one end of the pulling plate 320 is hinged to the second end 102, and the other end of the pulling plate 320 is hinged to the second preset position 42. Further, the second pulling member further includes a second wire rope 310, one end of the pulling plate 320 is hinged to the connecting shaft 110, the other end of the pulling plate 320 is connected to one end of the second wire rope 310, and the other end of the second wire rope 310 is connected to the second preset position 42. In this embodiment, the number of the pulling plates 320 is two, the two pulling plates 320 are both connected to the connecting shaft 110, and the connecting positions are symmetrically arranged relative to the middle of the connecting shaft 110, that is, the two pulling plates 320 are respectively connected to the left side and the right side of the middle of the connecting shaft 110. Each group of pulling plates 320 comprises a plurality of sub-pulling plates, and the plurality of sub-pulling plates are connected in sequence to form a group of pulling plates 320.

After the first steel wire rope 210 pulls the strut 100 to erect, the second steel wire rope 310 gradually extends until the second steel wire rope 310 is completely straightened, and the winch continuously pulls the auxiliary jib mast 40 to be lifted. Similarly, the second cable 310 may be replaced by a pulling plate, a pulling cable, a chain, or the like.

In this embodiment, the operation process of the cocking structure 60 includes:

referring to fig. 3, the support frame 100 is hinged to the fly jib mast 40 by a pin or a bearing. The fly jib mast 40 is hinged to the fly jib 20 by a pin, and the hinge axis 50 is shown in fig. 1. The movable pulley 240 is hinged to the bracket 100 by a link 220. The pulley is coupled to the bracket 230 by a pulley shaft, and the bracket 230 is coupled to the link 220. The link 220 is hinged to the bracket 100. The bracket 100 is a welded structure, and the connecting rod 220 is a welded structure of a steel tube.

Referring to fig. 4, the wrenching structure 60 is connected to the assembled fly jib mast 40, the support frame 100 and the pulley are laid or tilted on the fly jib mast 40 under the action of gravity, the second wire rope 310 connected to the left side of the support frame 100 is in a loose state, the first wire rope 210 is paid out from the hoist of the crane, and one end of the first wire rope 210 is connected to the fly jib 20 via the movable pulley 240 and fixed. A lifting lug may be generally provided on the sub-arm 20, and the first wire rope 210 may be fixed to the lifting lug.

Referring to fig. 5, after the boom 100 is lifted up slightly by the auxiliary hoist, the hoist pulls the first wire rope 210 to slowly pull the boom 100 to be erected. During slow erection of the brace 100, the auxiliary trolley is removed at the appropriate time.

Referring to fig. 6, the first cable 210 is pulled by the winch to completely erect the strut 100, at this time, the second cable 310 on the left side of the strut 100 is completely tightened from a loose state, and the second cable 310 on the left side of the strut 100 and the first cable 210 on the right side of the strut 100 simultaneously exert forces on the strut 100, so that the strut 100 is balanced. The winch continues to pull the first wire rope 210, and the movable pulley 240 pulls the sub-jib mast 40 to slowly rotate around the hinge shaft 50 through the connecting rod 220 and the supporting frame 100 and gradually rise until a desired angle is reached.

The strut 100 is erected by the auxiliary crane, and then the first wire rope 210 is pulled by the hoist, and the first wire rope 210 pulls the traveling block 240 and the strut 100, thereby pulling up the jib mast 40 connected to the strut 100. The reverse process is the disassembly process. On one hand, in the process of dismounting the fly jib mast 40, most of the work needing auxiliary crane operation in the original whole process can be completed by using the existing winch and the first steel wire rope 210, so that the dismounting process is simplified; on the other hand, the added support frame 100 and the movable pulley 240 are small in size and light in weight, and the convenience of transportation is not influenced.

The cocking structure 60 provided in this embodiment has at least the following advantages:

the wrenching structure 60 pulls the first pulling piece 200, the support frame 100 and the second pulling piece 300 through the winch, the jib mast 40 connected with the support frame 100 and the second pulling piece 300 is wrenched to rotate around the hinge axis, the auxiliary crane is only used for erecting the support frame 100 in the wrenching process of the jib mast 40, the whole jib mast 40 does not need to be hoisted, the winch is used in the wrenching process, the auxiliary crane is not used any more, the dismounting process of the jib mast 40 is simplified, the difficulty of dismounting work is reduced, the workload of the auxiliary crane is reduced, and the efficiency is improved. Meanwhile, the wrenching structure 60 has a simple structure, light weight and small size, and facilitates the transportation of the fly jib mast 40. The raising of the fly jib mast 40 can be accomplished by using the first wire rope 210 and the hoist of the crane itself in combination with the raising structure 60.

The embodiment of the utility model provides a hoist, hoist include the structure of wrenching 60. The first cable 210 is connected to the winch by passing around the movable pulley 240, the jib mast 40 is pulled up by the winch after the pulling plate 320 and the second cable 310 are tightened, then the first cable 210 is retracted to the winch, and the pulling structure 60 is retracted to the jib mast 40 and fixed according to the reverse process of pulling up. In the transport position, the raising structure 60 naturally lies flat on the fly jib mast 40.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A wrenching structure for wrenching a fly jib mast (40) for rotation about the fly jib (20), said fly jib mast (40) being articulated with the fly jib (20), characterized in that the wrenching structure comprises:

the supporting frame (100) comprises a first end (101) and a second end (102) which are arranged at intervals, and the first end (101) is used for being connected to a first preset position (41) of the fly jib mast (40);

a first pulling member (200), the first pulling member (200) connecting the second end (102) and a hoist of a crane;

a second pulling member (300), the second pulling member (300) connecting the second end (102) and a second predetermined position (42) on the fly jib mast (40);

under the pulling action of the winch, the support frame (100) keeps balance between the first pulling piece (200) and the second pulling piece (300), and a connecting line between the second end (102) and the first preset position (41) and the second preset position (42) forms a triangle.

2. The wrench structure according to claim 1, wherein:

the first pulling piece (200) comprises a first steel wire rope (210), one end of the first steel wire rope (210) is connected to the auxiliary arm (20), and the other end of the first steel wire rope (210) bypasses the second end (102) and is connected to the winch.

3. The wrench structure according to claim 2, wherein:

the first pulling member (200) further comprises a movable pulley (240) connected to the second end (102);

one end of the first steel wire rope (210) is fixed to the auxiliary arm (20), and the other end of the first steel wire rope (210) is connected to the winch by bypassing the movable pulley (240).

4. The wrench structure according to claim 3, wherein:

the first pulling piece (200) further comprises a connecting rod (220);

one end of the connecting rod (220) is hinged on the second end (102), and the movable pulley (240) is arranged at one end of the connecting rod (220) far away from the second end (102).

5. The wrench structure according to claim 1, wherein:

the second pulling piece (300) comprises at least one of a pulling plate (320), a second steel wire rope (310) and a chain;

the second pulling member (300) is connected between the second end (102) and the second predetermined position (42).

6. The wrench structure according to claim 5, wherein:

the second pulling piece (300) adopts a pulling plate (320);

one end of the pulling plate (320) is hinged to the second end (102), and the other end of the pulling plate (320) is hinged to the second preset position (42).

7. The wrench structure according to any one of claims 1-6, wherein:

the first end (101) is hinged on the first preset position (41).

8. The wrench structure according to claim 7, wherein:

the strut (100) further comprises a connecting shaft (110) arranged at the second end (102), and the connecting shaft (110) extends along the width direction of the fly jib mast (40);

the first pulling piece (200) is connected to the middle part of the connecting shaft (110);

the number of the second pulling parts (300) is two, the two second pulling parts (300) are connected to the connecting shaft (110), and the connecting positions are symmetrically distributed relative to the middle of the connecting shaft (110).

9. The wrench structure according to claim 8, wherein:

the support frame (100) further comprises a first support rod (120) and a second support rod (130) which are arranged side by side;

one end of the first support rod (120) and one end of the second support rod (130) are connected to two ends of the connecting shaft (110) respectively, and one end of the first support rod (120) and one end of the second support rod (130) far away from the connecting shaft (110) are connected to the first preset position (41) respectively.

10. A crane, characterized by:

comprising a cocking structure according to any one of claims 1 to 9.

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