Crane

Abstract

The invention provides a crane, and belongs to the technical field of offshore hoisting machinery. The crane comprises a rotary table, a first winch, a hinged base, a locking bolt and an A-shaped frame, the A-shaped frame comprises a front supporting rod, a first rear pull rod, a second rear pull rod and a supporting rod, the first end of the front supporting rod is hinged to the rotary table, the second end of the front supporting rod is hinged to the first end of the first rear pull rod, the second end of the first rear pull rod is hinged to the first end of the second rear pull rod, and the second end of the second rear pull rod is hinged to the rotary table; the first end of the supporting rod is hinged to the middle of the front supporting rod, the second end of the supporting rod is provided with a guide sliding block, the guide sliding block is provided with a first hinge hole, the hinge base is located on the rotary table and provided with a second hinge hole, and the locking bolt is used for being inserted into the first hinge hole and the second hinge hole. The first winch is located on the rotary table and used for pulling the front supporting rod. The problem that the hinged position of the A-shaped frame and the rotary table is seriously abraded can be solved, and the reliability of the A-shaped frame is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of offshore lifting machinery, and in particular to a crane. Background Art

[0002] With the demand for operations on the Yangtze River and inland rivers in recent years (such as bridge building, river construction, etc.), cranes equipped with A-frames have to be transferred from the sea to the Yangtze River and inland rivers. However, when a ship equipped with a crane passes through a bridge on the river, the height of the A-frame will exceed the navigation height of the bridge arch, making it impossible for the ship to navigate safely, and the height of the crane's A-frame needs to be lowered.

[0003] In the related art, the lower end of the A-frame is hinged on the turntable of the crane, and the crane is also equipped with a lowering device. During the lowering process, the lower end of the A-frame rotates relative to the turntable, thereby realizing the A-frame lowering to reduce the navigation height of the crane.

[0004] However, during the folding process, the hinged position between the lower end of the A-frame and the turntable will bear a large load, which makes the hinged position between the lower end of the A-frame and the turntable prone to serious wear, affecting the folding safety of the A-frame. Summary of the invention

[0005] The disclosed embodiment provides a crane, which can improve the problem of severe wear of the hinged position of the A-frame and the turntable, and improve the reliability of the A-frame. The technical solution is as follows:

[0006] The disclosed embodiment provides a crane, the crane comprises: a turntable, a first winch, an articulated base, a locking pin and an A-frame; the A-frame comprises: a front support rod, a first rear pull rod, a second rear pull rod and a support rod, the first end of the front support rod is hinged to the turntable, the second end of the front support rod is hinged to the first end of the first rear pull rod, the second end of the first rear pull rod is hinged to the first end of the second rear pull rod, and the second end of the second rear pull rod is hinged to the turntable; the first end of the support rod is hinged to the middle part of the front support rod, the second end of the support rod is provided with a guide slider, the guide slider has a first articulated hole, the articulated base is located on the turntable, the articulated base has a second articulated hole, the locking pin is used to be inserted into the first articulated hole and the second articulated hole, so that the guide slider and the articulated base are articulated; the first winch is located on the turntable, and the first winch is used to pull the second end of the front support rod.

[0007] In an implementation of the embodiment of the present disclosure, the guide slider is provided with at least two rollers which are arranged circumferentially at intervals with the center of the first hinge hole as the center.

[0008] In another implementation of the embodiment of the present disclosure, two rollers are provided on the guide slider, and the central angle of an arc passing through the rotation centers of the two rollers is 90° to 150°.

[0009] In another implementation of the embodiment of the present disclosure, the crane also includes a guide rail, which is located on the turntable, and the guide slider is located on the track surface of the guide rail, and the distance from the track surface to the turntable gradually decreases in the direction from the first end of the front support rod to the second end of the second rear pull rod.

[0010] In another implementation of the embodiment of the present disclosure, the crane further includes a wedge block, and the wedge block is located between the track surface and the roller.

[0011] In another implementation of the embodiment of the present disclosure, the crane also includes a first shelf and a second shelf, the first shelf is connected to the middle part of the front support rod, the second shelf is located on the turntable, and when the A-frame is in a laid-down state, the first shelf is located on the second shelf.

[0012] In another implementation of the embodiment of the present disclosure, the crane also includes a first sensor and a controller, and the first sensor and the motor of the first winch are electrically connected to the controller; the first sensor is located on the first shelf or the second shelf, and the first sensor is used to output a first signal to the controller when the first shelf and the second shelf are in contact, and the controller is configured to control the motor of the first winch to stop retracting and releasing the wire rope when receiving the first signal.

[0013] In another implementation of the embodiment of the present disclosure, the crane also includes a second sensor, which is located on the articulated base or the guide slider. The second sensor is used to output a second signal to the controller when the guide slider and the articulated base are facing each other, and the controller is configured to control the motor of the first winch to stop retracting and releasing the wire rope when receiving the second signal.

[0014] In another implementation of the embodiment of the present disclosure, the crane also includes a first guide pulley and a second guide pulley, the first guide pulley is located at the second end of the front support rod, and the second guide pulley is located on the turntable; the wire rope of the first winch is connected to the second end of the front support rod after passing through the first guide pulley and the second guide pulley in sequence.

[0015] In another implementation of the embodiment of the present disclosure, the crane also includes a boom, a first end of the boom is hinged on the turntable, a second end of the boom is connected to the second end of the front support rod via a wire rope, and the weight of the boom is greater than the weight of the A-frame.

[0016] The beneficial effects brought by the technical solution provided by the embodiments of the present disclosure include at least:

[0017] In the crane provided by the embodiment of the present disclosure, the A-frame is arranged on a turntable, the first end of the front support rod of the A-frame is hinged on the turntable, the second end of the front support rod is hinged to the first rear tie rod, and the second end of the second rear tie rod hinged to the first rear tie rod is hinged to the turntable, so that the front support rod, the first rear tie rod and the second rear tie rod form an A-shaped frame. Since the first rear tie rod and the second rear tie rod are hinged, when the front support rod is not fixed, the two rear tie rods will swing and fall to the turntable under the action of gravity, so that the A-frame is laid down. When the second end of the support rod is hinged to the hinged base of the turntable through the guide slider, the support rod fixes the front support rod on the turntable, allowing the front support rod to support the two rear tie rods, so that the A-frame can be kept in a pulled-up state.

[0018] When the A-frame needs to be controlled to be laid down, the locking pin is pulled out from the articulated base and the guide slider, so that the front support rod can be laid down. At the same time, the second end of the front support rod is pulled by the first winch, so that the two rear pull rods swing and fall to the turntable to complete the A-frame laying operation. When the A-frame needs to be controlled to be pulled up, the first car is controlled to release the rope, so that the A-frame is gradually pulled up under the traction of the arm. When the guide slider slides to the position of the articulated base, the locking pin is inserted into the articulated base and the guide slider, so that the A-frame is fixed on the turntable to complete the A-frame pulling operation.

[0019] In the implementation of the present disclosure, during the process of pulling up and laying down the A-shaped frame, since the first rear pull rod and the second rear pull rod can swing relative to each other, when the A-shaped frame is laid down, the second rear pull rod can be placed horizontally on the turntable, thereby transferring the load of the A-shaped frame in the laid-down state from the hinge of the second rear pull rod and the turntable to the second rear pull rod, which can reduce the load at the hinge of the second rear pull rod and the front support rod. At the same time, when the A-shaped frame is in the pulled-up state, in addition to the load borne at the hinge of the second rear pull rod and the front support rod, the support rod also intersects with the hinge base, so that the support rod can also share a part of the load, thereby reducing the hinge position of the lower end of the A-shaped frame and the turntable, improving the problem of severe wear at the hinge position of the A-shaped frame and the turntable, and improving the reliability of the A-shaped frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 is a schematic diagram of a crane provided by an embodiment of the present disclosure in a pulled-up state;

[0022] Figure 2 yes Figure 1 A partial enlarged view of a crane is provided;

[0023] Figure 3 is a schematic diagram of a crane provided by an embodiment of the present disclosure in a laid-down state;

[0024] Figure 4 yes Figure 3 An enlarged partial view of a crane is provided.

[0025] The descriptions of the marks in the figure are as follows:

[0026] 10. Turntable;

[0027] 20. First winch;

[0028] 30. hinge base; 31. second hinge hole;

[0029] 40. Locking latch;

[0030] 50. A-frame; 51. front support rod; 52. first rear tie rod; 53. second rear tie rod; 54. support rod;

[0031] 60. guide slider; 61. first hinge hole; 62. roller;

[0032] 71. guide rail; 72. wedge block;

[0033] 81. First shelf; 82. Second shelf;

[0034] 91. a first guide pulley; 92. a second guide pulley;

[0035] 100. Boom. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0037] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", "top", "bottom" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] Figure 1 Schematic diagram of a crane in a pulled-up state provided by an embodiment of the present disclosure. Figure 1 As shown, the crane includes: a turntable 10, a first winch 20, an articulated base 30, a locking latch 40 and an A-frame 50.

[0039] Figure 2 yes Figure 1 A partial enlarged view of a crane is provided. Figure 2 As shown, the A-frame 50 includes: a front support rod 51, a first rear pull rod 52, a second rear pull rod 53 and a support rod 54. The first end of the front support rod 51 is hinged to the turntable 10, the second end of the front support rod 51 is hinged to the first end of the first rear pull rod 52, the second end of the first rear pull rod 52 is hinged to the first end of the second rear pull rod 53, and the second end of the second rear pull rod 53 is hinged to the turntable 10.

[0040] like Figure 2 As shown, the first end of the support rod 54 is hinged at the middle part of the front support rod 51, and the second end of the support rod 54 is provided with a guide slider 60, which has a first hinge hole 61. The hinge base 30 is located on the turntable 10, and the hinge base 30 has a second hinge hole 31. The locking pin 40 is used to be inserted into the first hinge hole 61 and the second hinge hole 31 to hinge the guide slider 60 and the hinge base 30.

[0041] like Figure 2 As shown, the first winch 20 is located on the rotating platform 10 , and the first winch 20 is used to pull the second end of the front support rod 51 .

[0042] In the crane provided by the embodiment of the present disclosure, the A-shaped frame 50 is arranged on the turntable 10, the first end of the front support rod 51 of the A-shaped frame 50 is hinged on the turntable 10, the second end of the front support rod 51 is hinged with the first rear tie rod 52, and the second end of the second rear tie rod 53 hinged with the first rear tie rod 52 is hinged on the turntable 10, so that the front support rod 51, the first rear tie rod 52 and the second rear tie rod 53 form an A-shaped frame. Since the first rear tie rod 52 and the second rear tie rod 53 are hinged, when the front support rod 51 is not fixed, the two rear tie rods will swing and fall onto the turntable 10 under the action of gravity, so that the A-shaped frame 50 is laid down. When the second end of the support rod 54 is hinged to the hinged base 30 of the turntable 10 through the guide slider 60, the support rod 54 fixes the front support rod 51 on the turntable 10, so that the front support rod 51 supports the two rear tie rods, so that the A-shaped frame 50 can be kept in the pulled-up state.

[0043] Figure 3 It is a schematic diagram of a crane provided by an embodiment of the present disclosure in a laid-down state. Figure 4 yes Figure 3 A partial enlarged view of a crane is provided. Figure 3 , 4 As shown, when it is necessary to control the A-frame 50 to be laid down, the locking pin 40 is pulled out from the hinged base 30 and the guide slider 60, so that the front support rod 51 can be laid down. At the same time, the second end of the front support rod 51 is pulled by the first winch 20, so that the two rear pull rods swing and fall onto the turntable 10, so as to complete the laying operation of the A-frame 50.

[0044] like Figure 1 As shown, when it is necessary to control the A-frame 50 to be pulled up, the first car is controlled to release the rope, so that the A-frame 50 is gradually pulled up under the traction of the arm 100. When the guide slider 60 slides to the position of the articulated base 30, the locking pin 40 is inserted into the articulated base 30 and the guide slider 60, so as to fix the A-frame 50 on the turntable 10 to complete the pulling operation of the A-frame 50.

[0045] In the implementation of the present disclosure, when the A-shaped frame 50 is pulled up and laid down, since the first rear tie rod 52 and the second rear tie rod 53 can swing relative to each other, when the A-shaped frame 50 is laid down, the second rear tie rod 53 can be placed horizontally on the turntable 10, so that the load of the A-shaped frame 50 in the laid down state is transferred from the hinge of the second rear tie rod 53 and the turntable 10 to the second rear tie rod 53, so that the load at the hinge of the second rear tie rod 53 and the front support rod 51 can be reduced. At the same time, when the A-shaped frame 50 is in the pulled-up state, in addition to the load borne by the hinge of the second rear tie rod 53 and the front support rod 51, the support rod 54 also intersects with the hinge base 30, so that the support rod 54 can also share a part of the load, thereby reducing the hinge position of the lower end of the A-shaped frame 50 and the turntable 10, improving the problem of severe wear of the hinge position of the A-shaped frame 50 and the turntable 10, and improving the reliability of the A-shaped frame 50.

[0046] Alternatively, if Figure 2 As shown, the guide slider 60 is provided with at least two rollers 62 which are arranged circumferentially and spaced apart with the center of the first hinge hole 61 as the center.

[0047] In the disclosed embodiment, when the A-frame 50 needs to be controlled to fall down, the locking pin 40 is pulled out from the guide slider 60 and the hinged base 30, and the guide slider 60 will slide on the turntable 10. In order to prevent the guide slider 60 from being worn during the sliding process, a roller 62 is installed on the guide slider 60, and the sliding friction between the guide slider 60 and the turntable 10 is changed to rolling friction, thereby preventing the guide slider 60 from being easily worn.

[0048] For example, Figure 2 As shown, two rollers 62 are provided on the guide slider 60, and the central angle of the arc passing through the rotation centers of the two rollers 62 is 90° to 150°.

[0049] By setting the central angle of the arc corresponding to the rotation center of the two rollers 62 within the above range, the two rollers 62 are distributed on both sides of the first hinge hole 61 of the guide slider 60. Figure 2 As shown, when the A-shaped frame 50 is in the pulled-up state, the roller 62 on the left side of the guide slider 60 can roll in contact with the turntable 10; Figure 4 As shown, when the A-shaped frame 50 is in the laid-down state, the roller 62 on the right side of the guide slider 60 can roll in contact with the turntable 10. In this way, whether the A-shaped frame 50 is in the raised or laid-down state, at least one roller 62 always rolls in contact with the turntable 10, thereby preventing the guide slider 60 from being worn during the sliding process.

[0050] For example, the central angle corresponding to the arc of the rotation center of the two rollers 62 may be 120°.

[0051] Alternatively, if Figure 2As shown, the crane also includes a guide rail 71, which is located on the turntable 10, and the guide slider 60 is located on the track surface of the guide rail 71. From the first end of the front support rod 51 to the second end of the second rear pull rod 53, the distance from the track surface to the turntable 10 gradually decreases.

[0052] By setting the track surface of the guide track 71 as an inclined surface, the guide slider 60 can be guided to slide downward along the inclined surface. In this way, when the A-frame 50 needs to be laid down, the guide slider 60 can slide more smoothly from the high point of the guide track 71 to the low point.

[0053] At the same time, the guide rail 71 is provided to replace the turntable 10 in contact with the roller 62 , which can also prevent the roller 62 from directly contacting the turntable 10 and wearing the turntable 10 .

[0054] Furthermore, according to the attached Figure 2 and Figure 4 It can be seen that from the pulled-up state to the laid-down state of the A-shaped frame 50, the guide slider 60 will rotate a certain angle, so that the roller 62 on the left side of the guide slider 60 rotates counterclockwise from the state in which the roller 62 on the right side of the guide slider 60 contacts the guide rail to the state in which the roller 62 on the right side of the guide slider 60 contacts the guide rail. Therefore, the track surface of the guide rail 71 is set as an inclined surface, so that when the guide slider 60 slides, the gap between the guide slider 60 and the guide rail gradually increases, which is conducive to the guide slider 60 rotating counterclockwise to the state in which the roller 62 on the right side of the guide slider 60 contacts the guide rail.

[0055] Alternatively, if Figure 2 As shown, the crane also includes a wedge block 72 located between the track surface and the roller 62 .

[0056] In the disclosed embodiment, when the A-frame 50 is in the pulled-up state, the guide slider 60 and the articulated base 30 are connected together by the locking pin 40, and the guide slider 60 and the articulated base 30 are articulated. At this time, a wedge block 72 is arranged between the roller 62 and the guide rail, so that the wedge block 72 raises the guide slider 60 to achieve load transfer. In addition, when the roller 62 is supported on the wedge block 72, it is ensured that the first articulation hole 61 of the guide slider 60 and the second articulation hole 31 of the articulated base 30 are in a coaxial state, so that the locking pin 40 can be in a working condition that is almost not subjected to external load, so that the locking pin 40 can be more easily pulled out or installed to start the A-frame 50 to be laid down or pulled up.

[0057] Alternatively, if Figure 2 As shown, the crane also includes a first shelf 81 and a second shelf 82. The first shelf 81 is connected to the middle of the front support rod 51, and the second shelf 82 is located on the turntable 10. When the A-frame 50 is in a laid-down state, the first shelf 81 is located on the second shelf 82.

[0058] When the A-shaped frame 50 is switched from the pulled-up state to the laid-down state, the front support rod 51 will also gradually rotate toward the turntable 10, so that the first shelf 81 gradually approaches the second shelf 82. When the A-shaped frame 50 is in the laid-down state, the second shelf 82 supports the first shelf 81, thereby supporting the front support rod 51. This can limit the maximum laying angle of the front support rod 51 and prevent the laying range from being too large; at the same time, the shelf can also share part of the load, thereby improving the stability of the A-shaped frame 50.

[0059] Optionally, the crane further includes a first sensor and a controller, and the first sensor and the motor of the first winch 20 are both electrically connected to the controller.

[0060] Among them, the first sensor is located on the first shelf 81 or the second shelf 82. The first sensor is used to output a first signal to the controller when the first shelf 81 and the second shelf 82 are in contact. The controller is configured to control the motor of the first winch 20 to stop retracting and releasing the wire rope when receiving the first signal.

[0061] For example, the first sensor may be a pressure sensor, which is disposed on the second shelf 82. When the first shelf 81 is pressed against the second shelf 82, the pressure sensor detects the pressure and outputs a first signal to the controller, and after receiving the first signal, the controller controls the first winch 20 to stop retracting the wire rope, so that the first winch 20 no longer applies traction to the front support rod 51 to complete the lowering operation.

[0062] Exemplarily, the controller may be a programmable logic controller (PLC), which is a digital computing controller with a microprocessor for automated control, and can load control instructions into a memory at any time for storage and execution.

[0063] Optionally, the crane also includes a second sensor, which is located on the articulated base 30 or the guide slider 60. The second sensor is used to output a second signal to the controller when the guide slider 60 and the articulated base 30 are facing each other. The controller is configured to control the motor of the first winch 20 to stop retracting and releasing the wire rope when receiving the second signal.

[0064] Exemplarily, the second sensor may be a distance sensor, which is disposed on the articulated base 30. When the A-frame 50 is in the pulled-up state, the articulated base 30 and the guide slider 60 are facing each other, and the distance value detected by the distance sensor is very small. At this time, the distance sensor sends the detected value (second signal) to the controller, and the controller determines whether to control the second winch to stop releasing the rope based on the value. When the A-frame 50 is converted from the laid-down state to the pulled-up state, there is no other component of the articulated base 30 facing it, and the distance sensor has no detection value or the detection distance is large. At this time, after the controller determines that the value is too large, it controls the second winch to continue releasing the rope.

[0065] Alternatively, if Figure 1 , 2 As shown, the crane further includes a first guide pulley 91 and a second guide pulley 92 , wherein the first guide pulley 91 is located at the second end of the front support rod 51 , and the second guide pulley 92 is located on the turntable 10 .

[0066] like Figure 1 , 2 As shown, the steel wire rope of the first winch 20 is connected to the second end of the front support rod 51 after winding around the first guide pulley 91 and the second guide pulley 92 in sequence.

[0067] By providing two guide pulleys for the steel wire rope of the first winch 20 to be wound around, it is possible to effectively prevent the steel wire rope from being easily knotted during the process of being retracted and released.

[0068] Alternatively, if Figure 1 As shown, the crane also includes a boom 100, a first end of the boom 100 is hinged on the turntable 10, and a second end of the boom 100 is connected to the second end of the front support rod 51 through a wire rope. The weight of the boom 100 is greater than the weight of the A-frame 50.

[0069] In the above implementation, the gravity of the boom 100 is made greater than the weight of the A-frame 50, so that the torque generated by the deadweight of the boom 100 is greater than the torque generated by the deadweight of the A-frame 50. Since the boom 100 is also connected to the front support rod 51 through a steel wire rope, that is, the boom 100 will also provide a certain force to the A-frame 50, so that the A-frame 50 rotates in the direction where the boom 100 is located without being affected by other external forces. Therefore, when it is necessary to control the A-frame 50 to fall down, the first winch 20 applies a traction force to the front support rod 51, so that the first winch 20 pulls the A-frame 50 to fall down in the direction away from the boom 100; and when it is necessary to control the A-frame 50 to pull up, the first winch 20 starts to release the rope, and the A-frame 50 uses the force provided by the boom 100 to rotate in the direction where the boom 100 is located, so that the A-frame 50 can be rotated to the pulled-up state.

[0070] In the embodiment of the present disclosure, the first winch 20 can have a constant tension function. The first winch 20 retracts the rope to provide a backward tilting force for the A-frame 50 to be lowered, and the tension can be automatically adjusted and controlled in real time. Under the torque balance condition, a certain tension is also generated on the variable-length wire rope and the main lifting wire rope to ensure that during the A-frame 50 lowering process, the variable-length wire rope and the main lifting wire rope are always loaded when the wire rope is released, avoiding the operation to cause large-scale relaxation of the wire rope and friction with the main structure of the A-frame 50 and the boom 100; similarly, the first winch 20 releases the rope and also provides a backward pulling force for the A-frame 50 to be lowered. When the variable-length wire rope and the main lifting wire rope are retracted, the wire rope is always loaded to avoid friction with the wire rope. When the A-frame 50 is pulled up, the tension of the traction wire rope, the variable-length wire rope and the main lifting wire rope are always in a force balance state, ensuring the controllability and safe operability of the posture of the A-frame 50.

[0071] The process of laying down and raising the A-frame 50 of the crane provided in the embodiment of the present disclosure is as follows:

[0072] When controlling the A-frame 50 to be laid down, first, the locking pin 40 is pulled out from the hinged base 30 and the guide slider 60; then, the first winch 20 is controlled to pull the front support rod 51 to rotate in a direction away from the boom 100, so that the guide slider 60 of the support rod 54 slides along the guide track 71 in a direction away from the boom 100. When the first shelf 81 is pressed on the second shelf 82, the first sensor outputs a first signal, and the controller controls the first winch 20 to stop pulling the front support rod 51 based on the first signal to complete the laying down operation of the A-frame 50.

[0073] When controlling the A-frame 50 to be pulled up, first, the first winch 20 is controlled to release the rope, and under the traction of the boom 100, the front support rod 51 begins to rotate in the direction close to the boom 100; at this time, the guide slider 60 also slides along the guide track 71 in the direction close to the boom 100. Then, when the guide slider 60 moves to face the articulated base 30, the second sensor outputs a second signal, and the controller controls the first winch 20 to stop releasing the rope based on the second signal; then, the locking pin 40 is inserted into the guide slider 60 and the articulated base 30 to complete the operation of pulling up the A-frame 50.

[0074] The above does not limit the present disclosure in any form. Although the present disclosure has been disclosed as above through the embodiments, it is not used to limit the present disclosure. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present disclosure. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present disclosure without departing from the content of the technical solution of the present disclosure still falls within the scope of the technical solution of the present disclosure.

Claims

1. A crane, characterized in that: The crane comprises: a turntable (10), a first winch (20), an articulated base (30), a locking latch (40) and an A-frame (50); The A-shaped frame (50) comprises: a front support rod (51), a first rear pull rod (52), a second rear pull rod (53) and a support rod (54); the first end of the front support rod (51) is hinged to the turntable (10); the second end of the front support rod (51) is hinged to the first end of the first rear pull rod (52); the second end of the first rear pull rod (52) is hinged to the first end of the second rear pull rod (53); and the second end of the second rear pull rod (53) is hinged to the turntable (10); The first end of the support rod (54) is hinged to the middle part of the front support rod (51), the second end of the support rod (54) is provided with a guide slider (60), the guide slider (60) has a first hinge hole (61), the hinge base (30) is located on the turntable (10), the hinge base (30) has a second hinge hole (31), the locking pin (40) is used to be inserted into the first hinge hole (61) and the second hinge hole (31), so that the guide slider (60) and the hinge base (30) are hinged; The first winch (20) is located on the turntable (10), and the first winch (20) is used to pull the second end of the front support rod (51).

2. The crane according to claim 1, characterized in that: The guide slider (60) is provided with at least two rollers (62) which are arranged at intervals in the circumferential direction with the center of the first hinge hole (61) as the center.

3. The crane according to claim 2, characterized in that: The guide slider (60) is provided with two rollers (62), and the central angle of an arc passing through the rotation centers of the two rollers (62) is 90° to 150°.

4. The crane according to claim 2, characterized in that: The crane also includes a guide rail (71), wherein the guide rail (71) is located on the turntable (10), and the guide slider (60) is located on the track surface of the guide rail (71). In the direction from the first end of the front support rod (51) to the second end of the second rear pull rod (53), the distance from the track surface to the turntable (10) gradually decreases.

5. The crane according to claim 4, characterized in that: The crane also includes a wedge block (72) located between the track surface and the roller (62).

6. The crane according to any one of claims 1 to 5, characterized in that: The crane further comprises a first shelf (81) and a second shelf (82), wherein the first shelf (81) is connected to the middle portion of the front support rod (51), and the second shelf (82) is located on the turntable (10); when the A-frame (50) is in a laid-down state, the first shelf (81) is located on the second shelf (82).

7. The crane according to claim 6, characterized in that The crane further comprises a first sensor and a controller, wherein the first sensor and the motor of the first winch (20) are both electrically connected to the controller; The first sensor is located on the first shelf (81) or the second shelf (82), and the first sensor is used to output a first signal to the controller when the first shelf (81) and the second shelf (82) are in contact, and the controller is configured to control the motor of the first winch (20) to stop retracting and releasing the wire rope when receiving the first signal.

8. The crane according to claim 7, characterized in that: The crane further comprises a second sensor, which is located on the articulated base (30) or the guide slider (60), and the second sensor is used to output a second signal to the controller when the guide slider (60) and the articulated base (30) are facing each other, and the controller is configured to control the motor of the first winch (20) to stop retracting and releasing the wire rope when receiving the second signal.

9. The crane according to any one of claims 1 to 5, characterized in that: The crane further comprises a first guide pulley (91) and a second guide pulley (92), wherein the first guide pulley (91) is located at the second end of the front support rod (51), and the second guide pulley (92) is located on the turntable (10); The steel wire rope of the first winch (20) is connected to the second end of the front support rod (51) after winding around the first guide pulley (91) and the second guide pulley (92) in sequence.

10. The crane according to any one of claims 1 to 5, characterized in that: The crane further comprises a boom (100), a first end of the boom (100) being hinged on the turntable (10), a second end of the boom (100) being connected to a second end of the front support rod (51) via a steel wire rope, and a weight of the boom (100) being greater than a weight of the A-frame (50).

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