Frame assembly structure and crane

Abstract

The present invention provides a frame assembly structure and a crane, which relate to the technical field of mechanical equipment. The frame assembly structure includes a first frame and a second frame; a guide pull plate is provided on the first frame; a rotating member is provided on the second frame, and the rotating member is used to abut against the guide pull plate. The rotating member can rotate relative to the guide pull plate, and the guide pull plate can drive the first frame to move closer to the second frame through the reaction force. The crane includes the frame assembly structure provided above, and the rotating member abuts against the guide pull plate, and then the rotating member is rotated relative to the guide pull plate by a wrench or other tools that drive the rotating member to rotate, and the guide pull plate drives the pulley frame to move closer to the boom through the reaction force. The present invention solves the assembly problem of the pulley frame and the boom in the crane, and the pulley frame is installed more quickly, safely and securely, and positioned more accurately, without changing the angle at which the guide pull plate is erected.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical equipment, and in particular to a frame assembly structure and a crane. Background Art

[0002] Conventional crawler cranes currently come in two main structural types: boom and A-frame (or A-frame). When the crawler crane is in operation, the pulley frame on the A-frame connects to the upper boom of the boom. When the crawler crane is in transport mode, the pulley frame needs to be connected to the lower boom. Therefore, to switch from operation to transport mode, the pulley frame must first be disconnected from the upper boom and then connected to the lower boom.

[0003] As crawler cranes grow in size, the wire rope connecting the pulley frame becomes heavier, making it increasingly difficult to connect the pulley frame to the lower boom. Currently, the pulley frame and lower boom are connected by manual pulling or pedaling, which is inconvenient to install, inaccurate positioning, and unsafe. Furthermore, existing techniques involve adjusting the angle of the guide pull plate on the lower boom, but the greater the angle, the greater the risk of damage. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the present application provides a frame assembly structure and a crane, which solves the assembly problem of the pulley frame and the boom in the crane. The pulley frame is installed more quickly, safely and securely, and the positioning is more accurate, and there is no need to change the angle at which the guide pull plate is erected.

[0005] To achieve the above-mentioned purpose, the present application provides a rack assembly structure, comprising a first frame body and a second frame body;

[0006] The first frame is provided with a guide pull plate;

[0007] The second frame is provided with a rotating member, which is used to abut against the guide pull plate. The rotating member can rotate relative to the guide pull plate, and the guide pull plate can drive the first frame to move closer to the second frame through a reaction force.

[0008] In a possible embodiment, the number of the guide pull plates includes two, and the two guide pull plates are respectively arranged close to two sides of the first frame;

[0009] The number of the rotating members includes two, and the two rotating members are rotatably arranged on both sides of the second frame respectively.

[0010] In a possible implementation manner, a predetermined number of wrench rods are provided on a side of the rotating member away from the first frame, and the wrench rods are evenly distributed along the circumference of the rotating member.

[0011] In a possible embodiment, a predetermined number of recessed holes are provided at one end of the rotating member away from the first frame. The recessed holes are evenly distributed along the circumference of the rotating member, and the recessed holes are used to adapt to a tool that drives the rotating member to rotate.

[0012] In a possible embodiment, a polygonal boss or groove is provided at the end of the rotating member away from the first frame, and the boss or groove is adapted to be adapted to a tool that drives the rotating member to rotate.

[0013] In a possible embodiment, a first convex tooth structure is circumferentially provided on the rotating member, a second convex tooth structure is provided on the guide pull plate, and the first convex tooth structure and the second convex tooth structure are engaged in transmission.

[0014] In a possible implementation, the rotating member includes a gear shaft, the second convex tooth structure includes a rack, and the gear shaft and the rack are meshed for transmission.

[0015] In a possible implementation, the rotating member includes a mounting shaft and a gear, the gear is mounted on the mounting shaft, the second convex tooth structure includes a rack, and the gear is meshed with the rack for transmission.

[0016] In a possible implementation manner, an anti-slip agent is provided on the contact surface between the rotating member and the guide pull plate.

[0017] On the other hand, the present application also provides a crane, comprising the frame assembly structure provided above;

[0018] Wherein, the first frame includes a pulley frame, and the guide pull plate is provided on the pulley frame;

[0019] The second frame includes an arm frame, and the rotating member is provided on the arm frame.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The present application provides a frame assembly structure and a crane, wherein the frame assembly structure includes a first frame and a second frame; a guide pull plate is provided on the first frame; a rotating member is provided on the second frame, and the rotating member is used to abut against the guide pull plate, and the rotating member can rotate relative to the guide pull plate, and the guide pull plate can drive the first frame to move closer to the second frame through a reaction force. The crane includes the frame assembly structure provided above, wherein the rotating member abuts against the guide pull plate, and then the rotating member is rotated relative to the guide pull plate by a wrench or other tool that drives the rotating member to rotate, and the guide pull plate drives the pulley frame to move closer to the boom through a reaction force. The present application solves the assembly problem of the pulley frame and the boom in the crane, and the pulley frame is installed more quickly, safely and securely, and positioned more accurately, without changing the angle at which the guide pull plate is erected. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of a crane provided in an embodiment of the present application is shown;

[0024] Figure 2 A schematic structural diagram of the assembly of a pulley frame and a lower boom in a crane provided by an embodiment of the present application is shown;

[0025] Figure 3 A schematic diagram of the three-dimensional structure of a pulley frame provided in an embodiment of the present application is shown;

[0026] Figure 4 Shown Figure 3 A magnified schematic diagram of the local structure at point A in the middle;

[0027] Figure 5 A schematic structural diagram of a rotating member in a pulley frame provided in an embodiment of the present application is shown;

[0028] Figure 6 A schematic structural diagram of a second rotating member provided in an embodiment of the present application is shown;

[0029] Figure 7 A schematic structural diagram of the assembly of a third rotating member and a lower arm provided in an embodiment of the present application is shown.

[0030] Description of main component symbols:

[0031] 1-machine body; 10-tracked chassis assembly;

[0032] 2-arm frame; 20-guide pull plate; 200-inclined surface; 2000-second convex tooth structure; 2000a-rack; 21-first assembly portion; 210-first ear plate; 2a-upper arm; 2b-lower arm;

[0033] 3- pulley frame; 30- second assembly portion; 300- second ear plate; 300a- pin shaft; 31- rotating member; 310- mounting shaft; 311- rotating wheel; 3110- wrench rod; 3111- recessed hole; 313- first convex tooth structure; 313a- gear; 32- pulley;

[0034] 4-A type frame. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 understood as limiting the present invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0038] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0040] Example 1

[0041] See also Figure 1 The frame assembly structure provided in this embodiment can be applied to a crane.

[0042] The crane includes a body 1, a boom 2 and an A-frame 4 arranged on the body 1. The boom 2 includes an upper boom 2a and a corresponding lower boom 2b. The lower boom 2b is installed on the body 1, and the upper boom 2a is installed on the lower boom 2b.

[0043] When the crane is operating normally, the pulley frame 3 on the A-frame 4 is connected to the upper boom 2a through a pull plate. When the crane needs to enter the transportation state, the pulley frame 3 on the A-frame 4 should be installed on the lower boom 2b to pull the lower boom 2b for facilitating the transportation of the crane.

[0044] This embodiment takes the application of the frame assembly structure in a crane as an example to explain the technical solution of this application:

[0045] Please refer to Figure 1 、 Figure 2 as well as Figure 3 The rack assembly structure provided in this embodiment includes a first frame and a second frame, wherein the first frame is used to be assembled on the second frame.

[0046] Specifically, the first frame includes an arm frame 2, on which the lower arm section 2b of the arm frame 2 is provided with a guide pull plate 20 and a first assembly portion 21. The second frame includes a pulley frame 3, on which a rotating member 31 and a second assembly portion 30 are provided. The rotating member 31 is rotatably mounted on the pulley frame 3, and the second assembly portion 30 is used to cooperate with the first assembly portion 21 to achieve assembly between the pulley frame 3 and the lower arm frame 2.

[0047] When the pulley frame 3 is assembled with the lower arm 2b of the arm frame 2, the rotating member 31 abuts against the guide plate 20, and the rotating member 31 rotates relative to the guide plate 20. When the rotating member 31 rotates, it will give a certain thrust to the guide plate 20. Since the guide plate 20 is fixed on the lower arm 2b, the guide plate 20 is stationary relative to the rotating member 31. The guide plate 20 will drive the rotating member 31 to move through the reaction force. As a result, the rotating member 31 drives the pulley frame 3 to move along the guide plate 20, and then the pulley frame 3 can be moved closer to the lower arm 2b, so that the second assembly part 30 is aligned with the first assembly part 21 to achieve assembly.

[0048] It can be understood that the guide pull plate 20 is used to guide the pulley frame 3 to the lower arm 2b, that is, the guide pull plate 20 plays a guiding role. It can also be understood that a predetermined number of pulleys 32 are installed in the pulley frame 3.

[0049] Please refer to Figure 2 and Figure 6Furthermore, the first assembly portion 21 includes a first lug plate 210, which is mounted on the lower boom 2b and is provided with a first pin hole (not shown). The second assembly portion 30 includes a second lug plate 300, which is mounted on the pulley frame 3 and is provided with a second pin hole (not shown). During assembly, the first pin hole and the second pin hole are aligned, and the pin shaft 300a passes through the first and second pin holes, thereby achieving assembly between the pulley frame 3 and the lower boom 2b.

[0050] Furthermore, in this embodiment, there are two guide plates 20, one located near each side of the lower arm 2b. In other words, there is a guide plate 20 on each side of the lower arm 2b. Correspondingly, there are two rotating members 31, one located on each side of the pulley frame 3. When the pulley frame 3 is assembled with the guide plates 20, the rotating members 31 on either side of the pulley frame 3 correspond one-to-one with the guide plates 20 on either side of the lower arm 2b. In other words, the guide plates 20 on either side of the lower arm 2b provide both support and guidance.

[0051] In some specific embodiments, the guide pull plate 20 may be welded to the lower arm 2b, or may be installed on the lower arm 2b in an adjustable manner using bolts or positioning pins.

[0052] In this embodiment, the guide plate 20 is adjustably mounted on the lower arm 2b via a locating pin. An inclined surface 200 is provided on the side of the guide plate 20 facing away from the lower arm 2b, extending toward the lower arm 2b. The inclined surface 200 of the guide plate 20 is designed to contact the rotating member 31 in a frictional manner. When the rotating member 31 rotates, the inclined surface 200 drives the rotating member 31 through friction.

[0053] In some specific embodiments, the inclined surface 200 of the guide plate 20 is roughened to increase the friction between the inclined surface 200 and the rotating member 31 .

[0054] In some other specific embodiments, an anti-slip agent is provided between the inclined surface 200 of the guide pull plate 20 and the rotating member 31 to increase the friction between the inclined surface 200 and the rotating member 31 .

[0055] In other specific embodiments, an anti-slip part (not shown) is provided on the inclined surface 200 of the guide pull plate 20. The anti-slip part is laid on the inclined surface 200 and is in friction contact with the rotating part 31. The anti-slip part can increase the friction force and prevent the rotating part 31 from slipping during rotation.

[0056] Please refer to Figure 2 、 Figure 3 as well as Figure 4 In this embodiment, the rotating member 31 includes a mounting shaft 310 and a rotating wheel 311, wherein the mounting shaft 310 is fixedly connected to the pulley frame 3, and the rotating wheel 311 is coaxially rotatably mounted on the mounting shaft 310, and the rotating wheel 311 is used to abut against the inclined surface 200 of the guide pull plate 20. Furthermore, a bearing is provided between the rotating wheel 311 and the mounting shaft 310.

[0057] It can be understood that the wheel 311 is driven by a tool to rotate on the mounting shaft 310. Since the wheel 311 abuts against the inclined surface 200 of the guide pull plate 20, the wheel 311 will generate friction with the inclined surface 200 of the guide pull plate 20 when rotating. The guide pull plate 20 drives the pulley frame 3 to move through the reaction force, thereby realizing the pulley frame 3 to move closer to the lower arm 2b. The reaction force is the friction force.

[0058] Among them, the tool used to drive the rotating wheel 311 to rotate is a wrench, such as a solid wrench, an electric wrench, a filter wrench, etc., which uses the principle of leverage to drive the rotating wheel 311 to rotate, which is more labor-saving. It should be understood that the above is only an example and cannot be used as a limitation on the scope of protection of this application.

[0059] The frame assembly structure provided in this embodiment utilizes the reaction force of the guide plate 20 to drive the pulley frame 3 toward the lower arm 2b, achieving precise alignment between the first and second pin holes, and assembling the pulley frame 3 and the lower arm 2b via the pin 300a. This application has a simple structure and is easy to operate. The pulley frame 3 moves more smoothly on the guide plate 20, which is safer, more reliable, and has higher assembly precision than the prior art methods of stepping on and pulling by hand. Furthermore, the pulley frame 3 can be assembled with the lower arm 2b using a tool, and the principle of leverage can be utilized to achieve more labor-saving assembly. Therefore, this application can complete the assembly of the pulley frame 3 and the lower arm 2b without changing the angle at which the guide plate 20 is raised.

[0060] Example 2

[0061] This embodiment provides a frame assembly structure that can be applied to a crane. This embodiment is an improvement made on the basis of the above-mentioned embodiment 1. Compared with the embodiment 1, the main differences are:

[0062] Please refer to Figure 2 、 Figure 3 as well as Figure 5In this embodiment, the rotating member 31 includes a mounting shaft 310 and a rotating wheel 311. The mounting shaft 310 is fixedly connected to the pulley frame 3, and the rotating wheel 311 is coaxially rotatably mounted on the mounting shaft 310. The rotating wheel 311 is configured to abut the inclined surface 200 of the guide pull plate 20. Furthermore, a bearing is disposed between the rotating wheel 311 and the mounting shaft 310. A predetermined number of levers 3110 are disposed on a side of the rotating wheel 311 away from the pulley frame 3. The levers 3110 extend away from the rotating wheel 311. As will be understood, the rotating wheel 311 is driven to rotate by pulling the levers 3110.

[0063] Furthermore, the wrench rods 3110 are evenly distributed along the circumference of the rotating wheel 311, so as to ensure that the rotating wheel 311 is driven to rotate more smoothly by pulling the wrench rods 3110, and thus the pulley frame 3 moves more smoothly.

[0064] In other specific embodiments, the number of the wrench rods 3110 is four, five, six, etc. It should be understood that the above is only an example and is not intended to limit the scope of protection of this application.

[0065] Compared with the first embodiment, the rack assembly structure provided by this embodiment is more convenient to operate because the wrench rod 3110 replaces the tool for driving the rotating wheel 311 to rotate.

[0066] Example 3

[0067] This embodiment provides a frame assembly structure that can be applied to a crane. This embodiment is an improvement made on the basis of the above-mentioned embodiment 1. Compared with the embodiment 1, the difference between this embodiment and the embodiment 1 is as follows:

[0068] Please refer to Figure 2 、 Figure 3 as well as Figure 6 In this embodiment, the rotating member 31 includes a mounting shaft 310 and a rotating wheel 311. The mounting shaft 310 is fixedly connected to the pulley frame 3, and the rotating wheel 311 is coaxially rotatably mounted on the mounting shaft 310. The rotating wheel 311 is configured to abut the inclined surface 200 of the guide pull plate 20. Furthermore, a bearing is provided between the rotating wheel 311 and the mounting shaft 310. A predetermined number of recessed holes 3111 are provided on the side of the rotating wheel 311 away from the pulley frame 3. The recessed holes 3111 are evenly distributed along the circumference of the rotating wheel 311 and are adapted to accommodate a tool for driving the rotating wheel 311 to rotate. It can be understood that the tool for driving the rotating wheel 311 to rotate engages with the recessed holes 3111, thereby driving the rotating wheel 311 to rotate.

[0069] Example 4

[0070] Please refer to Figures 2 to 6This embodiment provides a frame assembly structure that can be applied to a crane. This embodiment is an improvement made on the basis of the above-mentioned embodiment 1. Compared with the embodiment 1, the difference is:

[0071] In this embodiment, the rotating member 31 includes a mounting shaft 310, which is rotatably mounted on the pulley frame 3 via a bearing. The mounting shaft 310 is configured to abut the inclined surface 200 of the guide pull plate 20. A polygonal boss (not shown) or groove (not shown) is provided on the end of the mounting shaft 310 facing away from the pulley frame 3. The polygonal boss or groove is configured to mate with a tool for rotating the mounting shaft 310. It will be appreciated that the tool for rotating the mounting shaft 310 engages with the boss or groove, thereby driving the mounting shaft 310 to rotate.

[0072] In some specific embodiments, a predetermined number of wrench rods 3110 or recessed holes 3111 may also be provided on the mounting shaft 310. The wrench rods 3110 and recessed holes 3111 have been described in detail in the above-mentioned second and third embodiments and will not be repeated here.

[0073] Example 5

[0074] See also Figure 1-Figure 7 This embodiment provides a frame assembly structure that can be used on a crane. This embodiment is an improvement based on any of the above embodiments. Compared with any of the above embodiments, the main differences are:

[0075] Please refer to the Figure 7 In this embodiment, the rotating member 31 is circumferentially provided with a first convex tooth structure 313, and the guide plate 20 is provided with a second convex tooth structure 2000. The first convex tooth structure 313 and the second convex tooth structure 2000 mesh and transmit. Specifically, the second convex tooth structure 2000 exerts a reaction force on the first convex tooth structure 313, thereby driving the pulley frame 3 to move and, in turn, assembling the pulley frame 3 with the lower arm 2b. This reaction force comprises a thrust and frictional force. It will be appreciated that the second convex tooth structure 2000 is disposed on the inclined surface 200 and is arranged along the direction in which the inclined surface 200 extends.

[0076] It should be noted that, for the rotating member 31 provided in Embodiments 1 to 3, the first protruding tooth structure 313 is provided on the rotating wheel 311. For the rotating member 31 provided in Embodiment 4, the first protruding tooth structure 313 is provided on the mounting shaft 310.

[0077] Example 6

[0078] See also Figure 1-Figure 7 This embodiment provides a frame assembly structure that can be applied to a crane. This embodiment is an improvement made on the basis of the above-mentioned embodiment 5. Compared with the embodiment 5, the main differences are:

[0079] See also Figure 7 In this embodiment, the rotating member 31 includes a mounting shaft 310 and a gear 313a. The mounting shaft 310 is rotatably mounted on the pulley frame 3, and the gear 313a is mounted on the mounting shaft 310. The gear 313a and the mounting shaft 310 can be assembled by keying, or alternatively, welding. The second protruding tooth structure 2000 provided on the guide plate 20 includes a rack 2000a. The gear 313a engages with the rack 2000a to achieve assembly between the pulley frame 3 and the lower arm 2b.

[0080] In some specific embodiments, the gear 313 a and the mounting shaft 310 may be made into an integrated gear shaft structure, that is, the gear 313 a and the mounting shaft 310 may be replaced by the gear shaft structure.

[0081] In other specific embodiments, the gear 313a may be a sprocket, and the rack 2000a may be a chain. Of course, a synchronous belt may also be used.

[0082] Example 7

[0083] See also Figure 1-Figure 7 The crane provided in this embodiment includes a body 1, a boom 2 and an A-frame 4 provided on the body 1. The crane provided in this embodiment uses the frame assembly structure provided in any of the above embodiments.

[0084] Furthermore, the crane is a crawler crane, that is, a crawler chassis assembly 10 is provided below the machine body 1 .

[0085] Please refer to Figure 1 , wherein the boom 2 includes an upper boom 2a and a corresponding lower boom 2b, the lower boom 2b is installed on the body 1, and the upper boom 2a is installed on the lower boom 2b. Furthermore, the upper boom 2a and the lower boom 2b are truss structures, and the upper boom 2a and the lower boom 2b are both V-shaped.

[0086] When the crane is operating normally, the pulley frame 3 on the A-frame 4 is connected to the upper boom 2a via a pull plate. When the crane needs to enter the transport state, the pulley frame 3 on the A-frame 4 must be installed on the lower boom 2b to pull the lower boom 2b for easy transportation of the crane. Therefore, in order to realize the transition from the operating state to the transport state of the crane, the specific operation method is as follows:

[0087] Please refer to Figure 1 and Figure 2First, control the movement of the A-frame 4 and the boom 2 to perform the arm-lying movement, so that the boom 2 is in a relatively horizontal position; then, the staff removes the connection between the pulley frame 3 on the A-frame 4 and the upper arm 2a, so that the pulley frame 3 falls on the guide pull plate 20, that is, the rotating part 31 contacts the guide pull plate 20; then, the rotating part 31 is driven by a tool to rotate, so that the pulley frame 3 moves along the guide pull plate 20 and approaches the lower arm 2b. When the second pin hole on the pulley frame 3 is aligned with the first pin hole; finally, the staff passes the pin shaft 300a through the second pin hole and the first pin hole to complete the assembly of the pulley frame 3 and the lower arm 2b.

[0088] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0089] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A crane, characterized in that: The invention comprises a frame assembly structure and a tool, wherein the frame assembly structure comprises a first frame body and a second frame body, wherein the first frame body comprises an arm frame, and the arm frame is provided with a guide pull plate; the second frame body comprises a pulley frame, and the pulley frame is provided with a rotating member; The rotating member is used to abut against the guide pull plate, and the rotating member can rotate relative to the guide pull plate. The tool is used to drive the rotating member to rotate relative to the guide pull plate, so that a reaction force is generated between the rotating member and the guide pull plate, and the guide pull plate can drive the second frame to move closer to the first frame through the reaction force; Wherein, the arm frame includes an upper arm and a lower arm, the lower arm is mounted on the machine body, the upper arm is mounted on the lower arm, the upper arm is connected to the pulley frame through a pull plate, and the guide pull plate is provided on the lower arm; In the working state, the pulling plate is connected to the pulley frame; In the transport state, the pulley frame is disconnected from the pull plate and connected to the lower arm.

2. The crane according to claim 1, characterized in that The number of the guide pull plates includes two, and the two guide pull plates are respectively arranged close to the two sides of the first frame; the number of the rotating members includes two, and the two rotating members are respectively rotatably arranged on the two sides of the second frame.

3. The crane according to claim 2, characterized in that A predetermined number of wrench rods are provided on a side of the rotating member away from the second frame, and the wrench rods are evenly distributed along the circumference of the rotating member.

4. The crane according to claim 2, characterized in that A predetermined number of recessed holes are provided at one end of the rotating member away from the second frame. The recessed holes are evenly distributed along the circumference of the rotating member and are used to match a tool that drives the rotating member to rotate.

5. The crane according to claim 2, characterized in that The end of the rotating member away from the second frame is provided with a polygonal boss or groove, and the boss or groove is used to adapt to a tool that drives the rotating member to rotate.

6. The crane according to claim 1, wherein: The rotating member is circumferentially provided with a first convex tooth structure, and the guide pull plate is provided with a second convex tooth structure, and the first convex tooth structure and the second convex tooth structure are engaged with each other for transmission.

7. The crane according to claim 6, characterized in that The rotating member includes a gear shaft, the second convex tooth structure includes a rack, and the gear shaft is meshed with the rack for transmission.

8. The crane according to claim 6, characterized in that The rotating member includes a mounting shaft and a gear, the gear is mounted on the mounting shaft, the second convex tooth structure includes a rack, and the gear is meshed with the rack for transmission.

9. The crane according to any one of claims 1 to 8, characterized in that: An anti-slip agent is provided on the contact surface between the rotating member and the guide pull plate.

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