crane

Abstract

The present disclosure provides a crane, belonging to the technical field of offshore hoisting machinery. The crane comprises a rotating platform, a first winch, a hinged base, a locking bolt 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 rotating platform, 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 rotating platform. The first end of the support rod is hinged to the middle of the front support rod, the second end of the support rod is provided with a guide sliding block, the guide sliding block is provided with a first hinge hole, the hinged base is located on the rotating platform and is 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 rotating platform and is used for pulling the front support rod. The present disclosure can improve the problem of serious wear of the hinge position of the A-frame and the rotating platform, and improve the reliability of the A-frame.

Description

[0001] The present disclosure relates to the technical field of offshore cranes, and in particular to a crane. BACKGROUND

[0002] With the demand for the Yangtze River and inland river operations (such as bridge erection, river construction, etc.) in recent years, the crane with an A-frame needs to be transferred from the sea to the Yangtze River and inland river operations. However, when the ship with the crane passes through the river bridge, the height of the A-frame will exceed the navigation height of the bridge arch, causing the ship to be unable to safely navigate, and the height of the crane A-frame needs to be reduced.

[0003] In the related art, the lower end of the A-frame is hinged to the slewing ring of the crane, and a folding device is also configured for the crane. During the folding process, the lower end of the A-frame rotates relative to the slewing ring, thereby realizing folding of the A-frame to reduce the navigation height of the crane.

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

[0005] The present disclosure provides a crane, which can improve the problem of serious wear and tear of the hinged position of the A-frame and the slewing ring, and improve the reliability of the A-frame. The technical solution is as follows:

[0006] The present disclosure provides a crane, which comprises a slewing ring, a first winch, a hinged base, a locking bolt, 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 slewing ring, 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 slewing ring. 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 sliding block, the guide sliding block has a first hinge hole, the hinged base is located on the slewing ring, the hinged base has a second hinge hole, and the locking bolt is used for being inserted into the first hinge hole and the second hinge hole to hinge the guide sliding block and the hinged base. The first winch is located on the slewing ring, and the first winch is used for pulling the second end of the front support rod.

[0007] In an implementation manner of the present disclosure, the guide sliding block is provided with at least two rollers which are arranged in a circumferential interval with the center of the first hinge hole as the center.

[0008] In another implementation manner of the embodiment of the present disclosure, two rollers are arranged on the guide slider, and the central angle of the arc passing through the rotation centers of the two rollers corresponds to 90-150 degrees.

[0009] In another implementation manner of the embodiment of the present disclosure, the crane further comprises a guide rail, the guide rail is arranged on the rotating table, and the guide slider is arranged on a track surface of the guide rail. In the direction from the first end of the front support rod to the second end of the second rear pull rod, the distance from the track surface to the rotating table gradually decreases.

[0010] In another implementation manner of the embodiment of the present disclosure, the crane further comprises a wedge-shaped block, the wedge-shaped block is arranged between the track surface and the roller.

[0011] In another implementation manner of the embodiment of the present disclosure, the crane further comprises a first resting seat and a second resting seat, the first resting seat is connected to the middle part of the front support rod, the second resting seat is arranged on the rotating table, and the first resting seat is arranged on the second resting seat when the A-shaped frame is in the laid-down state.

[0012] In another implementation manner of the embodiment of the present disclosure, the crane further comprises a first sensor and a controller, the first sensor and the motor of the first winch are electrically connected to the controller. The first sensor is arranged on the first resting seat or the second resting seat, and the first sensor is configured to output a first signal to the controller when the first resting seat and the second resting seat are in contact. The controller is configured to control the motor of the first winch to stop winding and unwinding the steel wire rope when the first signal is received.

[0013] In another implementation manner of the embodiment of the present disclosure, the crane further comprises a second sensor, the second sensor is arranged on the articulated base or the guide slider, and the second sensor is configured to output a second signal to the controller when the guide slider and the articulated base are directly opposite. The controller is configured to control the motor of the first winch to stop winding and unwinding the steel wire rope when the second signal is received.

[0014] In another implementation manner of the embodiment of the present disclosure, the crane further comprises a first guide pulley and a second guide pulley, the first guide pulley is arranged at the second end of the front support rod, and the second guide pulley is arranged on the rotating table. The steel wire rope of the first winch is connected to the second end of the front support rod after winding around the first guide pulley and the second guide pulley in sequence.

[0015] In another implementation of the embodiment of the present disclosure, the crane further comprises an arm support, a first end of the arm support is hinged to the rotary table, and a second end of the arm support is connected to the second end of the front support rod through a wire rope.

[0016] The technical scheme provided by the embodiment of the present disclosure has at least the following beneficial effects:

[0017] In the crane provided by the embodiment of the present disclosure, the A-frame is arranged on the rotary table, a first end of a front support rod of the A-frame is hinged to the rotary table, a second end of the front support rod is hinged to a first rear pull rod, and a second end of a second rear pull rod hinged to the first rear pull rod is hinged to the rotary table, so that the front support rod, the first rear pull rod and the second rear pull rod form an A-shaped frame. Since the first rear pull rod and the second rear pull rod are hinged, under the action of gravity, the two rear pull rods will swing and fall onto the rotary table in the state that the front support rod is not fixed, so as to make the A-frame fall down. When the second end of the support rod is hinged to the hinge base of the rotary table through the guide sliding block, the support rod fixes the front support rod on the rotary table, so that the front support rod supports the two rear pull rods, thereby making the A-frame maintain a pulled-up state.

[0018] When it is needed to control the A-frame to fall down, the locking bolt is pulled out of the hinge base and the guide sliding block, so that the front support rod can fall down, and 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 onto the rotary table, to complete the falling-down operation of the A-frame. When it is needed to control the A-frame to be pulled up, the rope of the first winch is controlled to be released, so that the A-frame is gradually pulled up under the traction of the arm support, and when the guide sliding block slides to the position of the hinge base, the locking bolt is inserted into the hinge base and the guide sliding block, so as to fix the A-frame on the rotary table, to complete the pulling-up operation of the A-frame.

[0019] In the embodiment of the present disclosure, during the pulling-up and falling-down of the A-frame, the first rear pull rod and the second rear pull rod can swing relative to each other, so that when the A-frame falls down, the second rear pull rod can be horizontally placed on the rotary table, thereby transferring the load of the A-frame in the falling-down state from the hinge position of the second rear pull rod and the rotary table to the second rear pull rod, so as to reduce the load at the hinge position of the second rear pull rod and the front support rod. At the same time, in the pulled-up state of the A-frame, in addition to the hinge position of the second rear pull rod and the front support rod bearing the load, the support rod also interacts with the hinge base, so that the support rod can also share part of the load, thereby reducing the hinge position of the lower end of the A-frame and the rotary table, improving the problem of serious wear of the hinge position of the A-frame and the rotary table, and improving the reliability of the A-frame. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

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

[0022] Figure 2 is Figure 1 is a partial enlarged view of a crane provided by an embodiment of the present disclosure;

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

[0024] Figure 4 is Figure 3 is a partial enlarged view of a crane provided by an embodiment of the present disclosure.

[0025] The descriptions of the various signs in the drawings are as follows:

[0026] 10, turntable;

[0027] 20, first winch;

[0028] 30, hinged base; 31, second hinged hole;

[0029] 40, locking bolt;

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

[0031] 60, guide sliding block; 61, first hinged hole; 62, roller;

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

[0033] 81, first resting seat; 82, second resting seat;

[0034] 91, first guide pulley; 92, second guide pulley;

[0035] 100, arm support. DETAILED DESCRIPTION

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

[0037] Unless otherwise defined, technical terms or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first", "second", "third", and the like, as used in the description and the claims of this disclosure do not denote any order, quantity, or importance, but are used to distinguish one element from another. Also, the terms "a" or "an", as used in the description and the claims of this disclosure do not denote a limitation of quantity but denote the presence of at least one. The terms "comprising", "including", and the like, as used in the description and the claims of this disclosure, mean that elements or objects preceding the word "comprising" or "including" encompass the elements or objects listed after the word "comprising" or "including" and equivalents thereof, and do not preclude other elements or objects. The terms "connected", "coupled", and the like, as used in the description and the claims of this disclosure, are not limited to direct or physical connections or couplings, but can include indirect or wireless connections or couplings. The terms "upper", "lower", "left", "right", "top", "bottom", and the like, are used only to indicate relative positions, and can change when the absolute positions of the described objects change.

[0038] Figure 1 is a schematic view of a crane in a pulling-up state according to an embodiment of the present disclosure. As shown in the figure, the crane comprises a rotating platform 10, a first winch 20, a hinged base 30, a locking bolt 40, and an A-frame 50. Figure 1

[0039] Figure 2 is a partial enlarged view of the crane according to an embodiment of the present disclosure. As shown in the figure, the A-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 rotating platform 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. The second end of the second rear pull rod 53 is hinged to the rotating platform 10. Figure 1 Figure 2 As shown in the figure, the first end of the support rod 54 is hinged to the middle of the front support rod 51. The second end of the support rod 54 is provided with a guide sliding block 60. The guide sliding block 60 has a first hinge hole 61. The hinged base 30 is located on the rotating platform 10. The hinged base 30 has a second hinge hole 31. The locking bolt 40 is used to be inserted into the first hinge hole 61 and the second hinge hole 31, so as to hinge the guide sliding block 60 and the hinged base 30.

[0040] As shown in the figure, the first winch 20 is located on the rotating platform 10. The first winch 20 is used to pull the second end of the front support rod 51. Figure 2

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

[0042] ​​​​The A-frame 50 is arranged on the rotary table 10, the first end of the front support rod 51 of the A-frame 50 is hinged on the rotary table 10, the second end of the front support rod 51 and the first rear pull rod 52 are hinged, the second end of the second rear pull rod 53 hinged with the first rear pull rod 52 is hinged on the rotary table 10, so that the front support rod 51, the first rear pull rod 52 and the second rear pull rod 53 form an A-shaped frame. Since the first rear pull rod 52 and the second rear pull rod 53 are hinged, under the action of gravity, the two rear pull rods will swing and fall on the rotary table 10 in the state that the front support rod 51 is not fixed, so as to make the A-frame 50 fall down. When the second end of the support rod 54 is hinged on the hinge base 30 of the rotary table 10 through the guide sliding block 60, the support rod 54 fixes the front support rod 51 on the rotary table 10, and the front support rod 51 supports the two rear pull rods, so that the A-frame 50 can be kept in the pulled-up state.

[0043] Figure 3 is a schematic view of a crane in a fallen state provided by the embodiment of the present disclosure. Figure 4 is Figure 3 is a partial enlarged view of a crane provided by the embodiment of the present disclosure. As Figure 3 , 4 shown, when the A-frame 50 needs to be controlled to fall down, the locking bolt 40 is pulled out from the hinge base 30 and the guide sliding block 60, so that the front support rod 51 can fall down, and 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 on the rotary table 10, to complete the falling-down operation of the A-frame 50.

[0044] As Figure 1 shown, when the A-frame 50 needs to be controlled to be pulled up, the first winch is controlled to release the rope, so that the A-frame 50 is gradually pulled up under the traction of the boom 100, when the guide sliding block 60 slides to the position of the hinge base 30, the locking bolt 40 is inserted into the hinge base 30 and the guide sliding block 60, so as to fix the A-frame 50 on the rotary table 10, to complete the pulling-up operation of the A-frame 50.

[0045] In the embodiment of the present disclosure, during the process of pulling up and putting down the A-frame 50, the first rear pull rod 52 and the second rear pull rod 53 can swing relative to each other, so that when the A-frame 50 is put down, the second rear pull rod 53 can be horizontally placed on the rotary table 10, thereby transferring the load of the A-frame 50 in the put-down state from the hinged position of the second rear pull rod 53 and the rotary table 10 to the second rear pull rod 53, so as to reduce the load at the hinged position of the second rear pull rod 53 and the front support rod 51. At the same time, when the A-frame 50 is pulled up, in addition to the hinged position of the second rear pull rod 53 and the front support rod 51 bearing the load, the support rod 54 also interacts with the hinged base 30, so that the support rod 54 can also share part of the load, thereby reducing the hinged position of the lower end of the A-frame 50 and the rotary table 10, improving the problem of serious wear of the hinged position of the A-frame 50 and the rotary table 10, and improving the reliability of the A-frame 50.

[0046] Optionally, as shown in Figure 2 The guide sliding block 60 is provided with at least two rollers 62 which are arranged in a circumferential interval with the center of the first hinged hole 61 as the center.

[0047] In the embodiment of the present disclosure, when it is necessary to control the A-frame 50 to be put down, the locking bolt 40 is pulled out from the guide sliding block 60 and the hinged base 30, at which time the guide sliding block 60 slides on the rotary table 10. In order to avoid the guide sliding block 60 being worn during the sliding process, the sliding friction between the guide sliding block 60 and the rotary table 10 is changed to rolling friction by installing the rollers 62 on the guide sliding block 60, thereby preventing the guide sliding block 60 from being easily worn.

[0048] Exemplarily, as shown in Figure 2 The guide sliding block 60 is provided with two rollers 62, and the central angle of the arc corresponding to 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 centers of the two rollers 62 in the above range, the two rollers 62 are distributed on both sides of the first hinged hole 61 of the guide sliding block 60. As shown in Figure 2 When the A-frame 50 is in the pulled-up state, the roller 62 on the left side of the guide sliding block 60 can be in rolling contact with the rotary table 10; as shown in Figure 4 When the A-frame 50 is in the put-down state, the roller 62 on the right side of the guide sliding block 60 can be in rolling contact with the rotary table 10. In this way, whether the A-frame 50 is in the pulled-up state or the put-down state, at least one roller 62 is always in rolling contact with the rotary table 10, thereby avoiding the guide sliding block 60 from being worn during the sliding process.

[0050] Exemplarily, the central angle of the arc corresponding to the rotation centers of the two rollers 62 can be 120°.

[0051] Optionally, as shown in Figure 2As shown, the crane further comprises a guide rail 71 located on the rotating platform 10, and the guide block 60 is located on the track surface of the guide rail 71, and the distance from the track surface to the rotating platform 10 gradually decreases from the first end of the front support rod 51 to the second end of the second rear pull rod 53.

[0052] By setting the track surface of the guide rail 71 as an inclined surface, the guide block 60 can be guided to slide down along the inclined surface, so that the guide block 60 can more smoothly slide from the high place to the low place of the guide rail 71 when the A-frame 50 needs to be laid down.

[0053] At the same time, by setting the guide rail 71 to replace the rotating platform 10 to contact with the rollers 62, the direct contact between the rollers 62 and the rotating platform 10 can be avoided, and the rotating platform 10 can be prevented from being worn.

[0054] In addition, according to the accompanying Figure 2 and Figure 4 It can be known that, from the pulled-up state to the laid-down state of the A-frame 50, the guide block 60 will rotate by a certain angle, so that the state that the roller 62 on the left side of the guide block 60 contacts with the guide rail counterclockwise rotates to the state that the roller 62 on the right side of the guide block 60 contacts with the guide rail. Therefore, by setting the track surface of the guide rail 71 as an inclined surface, the gap between the guide block 60 and the guide rail gradually increases when the guide block 60 slides, which is beneficial to the counterclockwise rotation of the guide block 60 to the state that the roller 62 on the right side of the guide block 60 contacts with the guide rail.

[0055] Optionally, as Figure 2 shown, the crane further comprises a wedge block 72 located between the track surface and the rollers 62.

[0056] In the embodiment of the present disclosure, when the A-frame 50 is in the pulled-up state, the guide block 60 and the hinged base 30 are connected together through the locking pin 40, and the guide block 60 and the hinged base 30 are hinged. At this time, by setting the wedge block 72 between the rollers 62 and the guide rail, the wedge block 72 can elevate the guide block 60 to realize load transfer. In addition, when the rollers 62 are supported on the wedge block 72, the first hinge hole 61 of the guide block 60 and the second hinge hole 31 of the hinged base 30 are in the coaxial state, so that the locking pin 40 can be in the working condition of almost not bearing external load, which makes the locking pin 40 more easily be pulled out or installed to open the A-frame 50 to lay down or pull up.

[0057] Optionally, as Figure 2 shown, the crane further comprises a first resting seat 81 connected to the middle part of the front support rod 51 and a second resting seat 82 located on the rotating platform 10, and the first resting seat 81 is located on the second resting seat 82 when the A-frame 50 is in the laid-down state.

[0058] When the A-frame 50 is converted from the pulled-up state to the laid-down state, the front support rod 51 is also gradually turned towards the rotary table 10, so that the first resting seat 81 is gradually close to the second resting seat 82. When the A-frame 50 is in the laid-down state, the second resting seat 82 supports the first resting seat 81, thereby supporting the front support rod 51. In this way, the maximum laid-down angle of the front support rod 51 can be limited to avoid excessive laid-down amplitude; at the same time, the resting seat can also share part of the load to improve the stability of the A-frame 50.

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

[0060] The first sensor is located on the first resting seat 81 or the second resting seat 82, and the first sensor is configured to output a first signal to the controller when the first resting seat 81 and the second resting seat 82 are in contact, and the controller is configured to control the motor of the first winch 20 to stop winding or unwinding the steel wire rope when the first signal is received.

[0061] For example, the first sensor can be a pressure sensor, which is arranged on the second resting seat 82. When the first resting seat 81 is pressed on the second resting seat 82, the pressure sensor detects the pressure and outputs the first signal to the controller, and the controller controls the first winch 20 to stop winding the steel wire rope after receiving the first signal, so that the first winch 20 no longer applies a traction force to the front support rod 51 to complete the laying-down operation.

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

[0063] Optionally, the crane further comprises a second sensor, the second sensor is located on the hinged base 30 or the guide slider 60, and the second sensor is configured to output a second signal to the controller when the guide slider 60 and the hinged base 30 are opposite, and the controller is configured to control the motor of the first winch 20 to stop winding or unwinding the steel wire rope when the second signal is received.

[0064] Exemplarily, the second sensor can be a distance sensor, which is arranged on the hinged base 30. When the A-frame 50 is in the pulled-up state, the hinged base 30 is opposite to the guide sliding block 60, and the distance sensor detects a small distance value. 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 the rope releasing based on the size of the value. When the A-frame 50 is in the process of being converted from the laid-down state to the pulled-up state, the hinged base 30 is not opposite to other components, and the distance sensor has no detection value or detects a large distance. At this time, the controller judges that the value is too large, and then controls the second winch to continue releasing the rope.

[0065] Optionally, as shown in Figure 1 、 2 , the crane further comprises a first guide pulley 91 and a second guide pulley 92. 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 rotating platform 10.

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

[0067] By arranging two guide pulleys for the steel wire rope of the first winch 20 to be wound, it can effectively avoid the steel wire rope from being easily knotted during the process of being reeled in and released.

[0068] Optionally, as shown in Figure 1 , the crane further comprises an arm support 100. The first end of the arm support 100 is hinged to the rotating platform 10, the second end of the arm support 100 is connected to the second end of the front support rod 51 through a steel wire rope, and the weight of the arm support 100 is greater than the weight of the A-frame 50.

[0069] In the above implementation manner, the weight of the arm support 100 is greater than the weight of the A-frame 50, so that the torque generated by the self-weight of the arm support 100 is greater than the torque generated by the self-weight of the A-frame 50. Since the arm support 100 is also connected to the front support rod 51 through a steel wire rope, the arm support 100 will also provide a certain force to the A-frame 50, so that the A-frame 50 rotates towards the direction of the arm support 100 under the action of no other external force. Therefore, when it is needed to control the A-frame 50 to be laid down, the first winch 20 exerts a traction force on the front support rod 51, so that the first winch 20 pulls the A-frame 50 to be laid down away from the arm support 100; and when it is needed to control the A-frame 50 to be pulled up, the first winch 20 starts to release the rope, and the A-frame 50 rotates towards the direction of the arm support 100 by using the force provided by the arm support 100, so that the A-frame 50 can be assembled and rotated to the pulled-up state.

[0070] In the embodiments of the present disclosure, the first winch 20 can have a constant tension function. The first winch 20 provides a backward tilting pulling force for the A-frame 50 to be laid down, and the pulling force can be automatically adjusted in real time. Under the condition of torque balance, a certain pulling force is also generated on the luffing wire and the main hoisting wire, so that the wire is always loaded during the wire laying operation of the A-frame 50, thereby avoiding the wire from being relaxed and rubbing against the main structure of the A-frame 50 and the boom 100. Similarly, the first winch 20 provides a backward pulling force for the A-frame 50 to be laid down during the wire laying operation of the A-frame 50, so that the wire is always loaded during the wire laying operation of the A-frame 50, thereby avoiding the wire from being relaxed and rubbing against the main structure of the A-frame 50 and the boom 100. In the state that the A-frame 50 is pulled up, the tension of the traction wire, the luffing wire and the main hoisting wire is always in a force balance state, so that the posture of the A-frame 50 is controllable and safe to operate.

[0071] The A-frame 50 laying down and pulling up operation process of the crane provided by the embodiments of the present disclosure is as follows.

[0072] When the A-frame 50 is controlled to be laid down, first, the locking bolt 40 is pulled out of the hinge base 30 and the guide sliding block 60. Then, the first winch 20 is controlled to pull the front support rod 51 to rotate away from the boom 100, so that the guide sliding block 60 of the support rod 54 slides away from the boom 100 along the guide rail 71. When the first resting base 81 is pressed on the second resting base 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, so as to complete the laying down operation of the A-frame 50.

[0073] When the A-frame 50 is controlled to be pulled up, first, the first winch 20 is controlled to lay the wire. Under the traction of the boom 100, the front support rod 51 starts to rotate towards the boom 100. At this time, the guide sliding block 60 also slides towards the boom 100 along the guide rail 71. Then, when the guide sliding block 60 moves to be opposite to the hinge base 30, the second sensor outputs a second signal, and the controller controls the first winch 20 to stop laying the wire based on the second signal. Then, the locking bolt 40 is inserted into the guide sliding block 60 and the hinge base 30, so as to complete the pulling up operation of the A-frame 50.

[0074] The above is not intended to limit the present disclosure in any form. Although the present disclosure has been disclosed as above through embodiments, it is not intended to limit the present disclosure. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes do not deviate from the technical solutions of the present disclosure. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present disclosure still belong to the scope of the technical solutions of the present disclosure.

Claims

1. A crane, characterized in that The crane comprises a rotating platform (10), a first winch (20), a hinged base (30), a locking bolt (40), an A-shaped frame (50), a guide rail (71) and a wedge block (72); 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 rotating platform (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 rotating platform (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 sliding block (60), the guide sliding block (60) is provided with a first hinge hole (61), the hinged base (30) is located on the rotating platform (10), the hinged base (30) is provided with a second hinge hole (31), and the locking bolt (40) is used for being inserted into the first hinge hole (61) and the second hinge hole (31) to hinge the guide sliding block (60) and the hinged base (30); The first winch (20) is located on the rotating platform (10), and the first winch (20) is used for pulling the second end of the front support rod (51); The guide sliding block (60) is provided with at least two rollers (62) which are arranged in a circumferential direction and are spaced apart from each other with the center of the first hinge hole (61) as the center, the guide rail (71) is located on the rotating platform (10), the guide sliding block (60) is located on the track surface of the guide rail (71), and the distance from the track surface to the rotating platform (10) gradually decreases in the direction from the first end of the front support rod (51) to the second end of the second rear pull rod (53), and the wedge block (72) is located between the track surface and the rollers (62); When the A-shaped frame (50) is in a pulled-up state, the roller (62) on the left side of the guide sliding block (60) is in rolling contact with the rotating platform (10); when the A-shaped frame (50) is in a laid-down state, the roller (62) on the right side of the guide sliding block (60) is in rolling contact with the rotating platform (10).

2. The crane of claim 1, wherein, The guide sliding block (60) is provided with two rollers (62), and the central angle of the arc passing through the rotation centers of the two rollers (62) corresponds to 90°-150°.

3. The crane according to claim 1 or 2, characterized in that The crane further comprises a first resting seat (81) and a second resting seat (82), the first resting seat (81) is connected to the middle part of the front support rod (51), the second resting seat (82) is located on the rotating platform (10), and when the A-shaped frame (50) is in a laid-down state, the first resting seat (81) is located on the second resting seat (82).

4. The crane of claim 3, wherein, The crane further comprises a first sensor and a controller, the first sensor and the motor of the first winch (20) are electrically connected to the controller. The first sensor is located on the first resting seat (81) or the second resting seat (82), and is used to output a first signal to the controller when the first resting seat (81) and the second resting seat (82) are in contact, and the controller is configured to control the motor of the first winch (20) to stop winding and unwinding the steel wire rope when the first signal is received.

5. The crane of claim 4, wherein, The crane further comprises a second sensor 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 directly opposite, and the controller is configured to control the motor of the first winch (20) to stop winding and unwinding the steel wire rope when the second signal is received.

6. A crane according to claim 1 or 2, characterised 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 rotary table (10). The steel wire rope of the first winch (20) is connected to the second end of the front support rod (51) after passing through the first guide pulley (91) and the second guide pulley (92) in sequence.

7. A crane according to claim 1 or 2, characterised in that The crane further comprises an arm support (100), wherein the first end of the arm support (100) is articulated on the rotary table (10), the second end of the arm support (100) is connected to the second end of the front support rod (51) through a steel wire rope, and the weight of the arm support (100) is greater than the weight of the A-shaped frame (50).

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