Pin puller and crane

Abstract

The present disclosure provides a pin pulling device and a crane, and belongs to the technical field of offshore hoisting machinery. The pin pulling device comprises a mounting base, an extension mechanism, a hinged pin shaft, a guide connecting plate and a guide rail. The extension mechanism is located on the mounting surface of the mounting base, the extension rod of the extension mechanism is hinged to the first side edge of the guide connecting plate, the second side edge of the guide connecting plate is hinged to the hinged pin shaft, and the first side edge and the second side edge are opposite side edges of the guide connecting plate. The guide rail is located on the mounting surface, the sliding surface of the guide rail is away from the mounting surface, and the guide connecting plate is located on the sliding surface. From the arrangement direction of the first side edge to the second side edge, the distance from the sliding surface to the mounting surface gradually increases. The present disclosure ensures the coaxiality of the pin shaft and the pin hole, and improves the pin insertion and extraction efficiency.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of offshore hoisting machinery, and particularly relates to a pin pulling device and 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, cranes with A-frame are required to be transferred from the sea to the Yangtze River and inland river operations. When the crane-equipped ship passes through the river bridge, a folding device is usually arranged to control the folding of the A-frame to reduce the height of the crane A-frame, so that the ship can safely pass through the river bridge.

[0003] In the related art, the pin shaft of the A-frame is often pulled out or inserted during the folding or pulling up of the A-frame. The crane turntable is usually provided with a pin pulling device to control the insertion and pulling of the pin shaft. The pin pulling device includes an electric push rod and a pin shaft. The electric push rod is fixed on the crane turntable, and the extension rod of the electric push rod is connected to one end of the pin shaft, so as to control the extension of the pin shaft.

[0004] Due to the long stroke path of the pin shaft and the weight of the pin shaft itself, the electric push rod will have a downward movement trend under the influence of gravity during the extension of the pin shaft. This affects the coaxiality of the pin shaft and the hinge hole, thereby reducing the insertion and pulling efficiency of the pin shaft. SUMMARY

[0005] The present disclosure provides a pin pulling device and a crane, which can ensure the coaxiality of the pin shaft and the pin hole and improve the insertion and pulling efficiency of the pin shaft. The technical solution is as follows:

[0006] The present disclosure provides a pin pulling device, which includes a mounting base, an extension mechanism, a hinge pin shaft, a guide connecting plate, and a guide rail. The extension mechanism is located on the mounting surface of the mounting base. The extension rod of the extension mechanism is hinged to the first side edge of the guide connecting plate. The second side edge of the guide connecting plate is hinged to the hinge pin shaft. The first side edge and the second side edge are opposite side edges of the guide connecting plate. The guide rail is located on the mounting surface. The sliding surface of the guide rail is away from the mounting surface. The guide connecting plate is located on the sliding surface. From the arrangement direction of the first side edge to the second side edge, the distance between the sliding surface and the mounting surface gradually increases.

[0007] In an implementation manner of the present disclosure, the pin pulling device further includes an electromagnet and a magnetic material piece. The magnetic material piece is located on the second side edge of the guide connecting plate. The electromagnet is located on the mounting surface and is located at one end of the guide rail away from the first side edge.

[0008] In another implementation manner of the embodiment of the present disclosure, the pin pulling device further comprises a first hinged seat and a sliding sleeve, the first hinged seat comprises a hinged cylinder and a first support plate, the first support plate has a through hole, the hinged cylinder is coaxially inserted into the through hole, and the hinged cylinder is fixedly connected with the first support plate; the sliding sleeve is coaxially sleeved in the inner hole of the hinged cylinder, the inner wall of the sliding sleeve has an annular groove, the outer wall of the hinged cylinder has an oil injection hole penetrating to the annular groove, and the hinged pin shaft is coaxially inserted into the inner hole of the sliding sleeve, and the outer wall of the hinged pin shaft and the annular groove form a lubricating cavity.

[0009] In another implementation manner of the embodiment of the present disclosure, the outer wall of the hinged cylinder further has an oil delivery hole penetrating to the annular groove; the sliding surface of the guide rail has a lubricating groove extending along the arrangement direction of the first side edge and the second side edge; the pin pulling device further comprises an oil delivery pipe, one end of the oil delivery pipe is in communication with the oil delivery hole, and the other end of the oil delivery pipe is in communication with the lubricating groove.

[0010] In another implementation manner of the embodiment of the present disclosure, the pin pulling device further comprises a second hinged seat, the second hinged seat has a tapered hole, and the larger end of the tapered hole is close to the telescopic mechanism; the end of the hinged pin shaft away from the telescopic mechanism is in the shape of a truncated cone, and the end of the hinged pin shaft away from the telescopic mechanism is coaxially inserted into the tapered hole.

[0011] In another implementation manner of the embodiment of the present disclosure, the conical angle of the tapered hole is less than or equal to 10°.

[0012] In another implementation manner of the embodiment of the present disclosure, the telescopic mechanism comprises an electric push rod, a position sensor, a sliding block, a sliding rod, a first limiting rod and a second limiting rod; the first limiting rod is located on the cylinder barrel of the electric push rod, one end of the first limiting rod has a limiting hole, the second limiting rod is located on the telescopic rod of the electric push rod, one end of the sliding rod is connected with one end of the second limiting rod, the other end of the sliding rod passes through the limiting hole, the sliding block is fixedly sleeved on the sliding rod and located between the first limiting rod and the second limiting rod; the position sensor is located on the first limiting rod, and the position sensor is opposite to the sliding rod.

[0013] In another implementation manner of the embodiment of the present disclosure, the length of the guide rail is greater than or equal to the maximum stroke of the telescopic mechanism.

[0014] In another implementation manner of the embodiment of the present disclosure, the included angle between the sliding surface and the mounting surface is 3° to 15°.

[0015] The crane provided by the embodiment of the present disclosure comprises the pin pulling device, the A-frame and the rotary table, and the pin pulling device and the A-frame are both located on the rotary table.

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

[0017] The pin pulling device provided by the embodiment of the present disclosure is provided with a guide connecting plate between the telescopic rod of the telescopic mechanism and the hinge pin shaft, and the telescopic rod and the hinge pin shaft are respectively hinged on the opposite two side edges of the guide connecting plate. Meanwhile, the guide rail is arranged on the mounting base, the guide connecting plate is located on the sliding surface of the guide rail, and the distance from the sliding surface to the mounting surface gradually increases in the arrangement direction from the first side edge to the second side edge. That is, the sliding surface is arranged as an inclined surface. In this way, in the process of the telescopic rod of the telescopic mechanism pushing the hinge pin shaft to move, the guide connecting plate will move upward along the inclined surface, that is, the guide connecting plate will push the hinge pin shaft connected thereto to move upward. Thus, the error of the downward movement of the hinge pin shaft caused by the gravity factor can be effectively compensated. Since the longer the telescopic rod is extended, the greater the influence of gravity on the downward movement of the hinge pin shaft, at this time, the guide connecting plate moves along the sliding surface for a longer distance, and correspondingly, the guide rail compensates for the downward movement of the hinge pin shaft more. Therefore, the guide rail and the guide connecting plate are arranged to be used in cooperation, so as to ensure the coaxiality of the hinge pin shaft and the hinge hole and improve the pin pulling efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present disclosure, the drawings needed in the embodiment 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 labor.

[0019] Figure 1 is a structural schematic view of a pin pulling device provided by the embodiment of the present disclosure;

[0020] Figure 2 is a partial schematic view of a pin pulling device provided by the embodiment of the present disclosure;

[0021] Figure 3 is an insertion and mounting schematic view of a first hinge seat and a hinge pin shaft provided by the embodiment of the present disclosure;

[0022] Figure 4 is a partial schematic view of a pin pulling device provided by the embodiment of the present disclosure;

[0023] Figure 5 is a structural schematic view of a crane provided by the embodiment of the present disclosure.

[0024] The various marks in the drawings are explained as follows:

[0025] 10, mounting base; 11, mounting surface;

[0026] 20, telescopic mechanism; 21, electric push rod; 22, position sensor; 23, sliding block; 24, sliding rod; 25, first limiting rod; 26, second limiting rod;

[0027] 31, hinge pin; 32, guide connecting plate; 33, guide rail; 330, sliding surface; 34, lubricating groove;

[0028] 41, electromagnet; 42, magnetic material piece;

[0029] 51, first hinge seat; 511, hinge cylinder; 512, first support plate; 513, oil injection hole; 514, oil delivery hole;

[0030] 52, sliding shaft sleeve; 521, annular groove;

[0031] 53, second hinge seat; 531, tapered hole;

[0032] 70, rotary table;

[0033] 81, front support rod; 82, first rear pull rod; 83, second rear pull rod; 85, support rod;

[0034] 90, guide sliding block; 91, roller; 92, guide sliding rail;

[0035] 100, arm support. DETAILED DESCRIPTION

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

[0037] Unless otherwise defined, technical terms or scientific terms used herein 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 herein, do not have any quantitatively meaning, unless otherwise defined. Such terms are used only to identify different components of the disclosure. Also, the terms "one", "another", "an", and the like, as used in the description and the claims herein, do not have any quantitatively meaning, unless otherwise defined. Such terms are used only to identify at least one. The terms "including", "containing", and the like, as used in the description and the claims herein, mean that elements or objects preceding the transition are inclusive of one or more of elements or objects of the reciting following the transition, and are not exclusive of other elements or objects. The terms "connected", "coupled", and the like, as used in the description and the claims herein, are not limited to direct connections or couplings, but also include indirect connections or couplings, unless otherwise defined. The terms "upper", "lower", "left", "right", "top", "bottom", and the like, are used only to represent relative positional relationships, and can be changed when the absolute positions of the described objects are changed.

[0038] Figure 1 is a structural schematic diagram of a pin pulling device provided by an embodiment of the disclosure. As shown in Figure 1 , the pin pulling device comprises a mounting base 10, a telescopic mechanism 20, a hinged pin shaft 31, a guide connecting plate 32, and a guide rail 33.

[0039] As shown in Figure 1 , the telescopic mechanism 20 is located on a mounting surface 11 of the mounting base 10, a telescopic rod of the telescopic mechanism 20 is hinged to a first side edge of the guide connecting plate 32, a second side edge of the guide connecting plate 32 is hinged to the hinged pin shaft 31, and the first side edge and the second side edge are opposite side edges of the guide connecting plate 32.

[0040] As shown in Figure 1 , the guide rail 33 is located on the mounting surface 11, a sliding surface 330 of the guide rail 33 is away from the mounting surface 11, and the guide connecting plate 32 is located on the sliding surface 330. In the arrangement direction from the first side edge to the second side edge, the distance from the sliding surface 330 to the mounting surface 11 gradually increases.

[0041] The pin pulling device provided by the embodiments of the present disclosure sets a guide connecting plate 32 between the telescopic rod of the telescopic mechanism 20 and the hinged pin shaft 31, and the telescopic rod and the hinged pin shaft 31 are hinged on opposite two side edges of the guide connecting plate 32 respectively. Meanwhile, a guide rail 33 is set on the mounting base 10, the guide connecting plate 32 is located on a sliding surface 330 of the guide rail 33, and the distance from the sliding surface 330 to the mounting surface 11 gradually increases in the arrangement direction from the first side edge to the second side edge. That is, the sliding surface 330 is set as an inclined surface. In this way, in the process of the telescopic rod of the telescopic mechanism 20 pushing the hinged pin shaft 31 to act, the guide connecting plate 32 will move upward along the inclined surface step by step, that is, the guide connecting plate 32 will push the hinged pin shaft 31 connected thereto to move upward. Thus, the error of the hinged pin shaft 31 moving downward due to the gravity factor can be effectively compensated. Since the longer the telescopic rod extends, the greater the effect of the gravity on the hinged pin shaft 31 moving downward, at this time, the guide connecting plate 32 moves along the sliding surface 330 for a longer distance, and correspondingly, the guide rail 33 compensates for the hinged pin shaft 31 moving downward more. Therefore, the guide rail 33 and the guide connecting plate 32 are set to be used in cooperation, which can ensure the coaxiality of the hinged pin shaft 31 and the hinged hole and improve the pin pulling efficiency.

[0042] Optionally, the angle between the sliding surface 330 and the mounting surface 11 is 3° to 15°.

[0043] As an example, in the embodiments of the present disclosure, the angle between the sliding surface 330 and the mounting surface 11 is 9°. In this way, the sliding surface 330 is set as an inclined surface, in the process of the telescopic rod of the telescopic mechanism 20 pushing the hinged pin shaft 31 to act, the guide connecting plate 32 will move upward along the inclined surface step by step, that is, the guide connecting plate 32 will push the hinged pin shaft 31 connected thereto to move upward, thus the error of the hinged pin shaft 31 moving downward due to the gravity factor can be effectively compensated.

[0044] Figure 2 is a partial schematic view of a pin pulling device provided by the embodiments of the present disclosure. As shown in Figure 2 the pin pulling device further includes an electromagnet 41 and a magnetic material piece 42, the magnetic material piece 42 is located at the second side edge of the guide connecting plate 32, and the electromagnet 41 is located on the mounting surface 11 and at one end of the guide rail 33 away from the first side edge.

[0045] Exemplarily, the magnetic material piece 42 can be a magnet, and the magnet is arranged at a position opposite to the electromagnet 41 on the guide connecting plate 32.

[0046] Among them, the magnet has a first magnetic pole and a second magnetic pole which are opposite in magnetism. When placing the magnetic material, one of the first magnetic pole and the second magnetic pole of the magnet is opposite to the electromagnet 41, and the other of the first magnetic pole and the second magnetic pole of the magnet faces away from the electromagnet.

[0047] Exemplarily, one end of the core of the electromagnet 41 is opposite to the magnetic material piece 42, and the other end of the core of the electromagnet 41 is directed away from the magnetic material piece 42.

[0048] In the embodiments of the present disclosure, the pin pulling device further comprises a controller, the controller is electrically connected with the electromagnet 41, and the controller can control the energization direction of the coil wound on the core of the electromagnet 41. By changing the energization direction of the coil, the end of the electromagnet 41 directed towards the magnetic material piece 42 is switched to different magnetic poles.

[0049] Exemplarily, the controller can be a programmable logic controller (PLC). The PLC is a digital operation controller with a microprocessor for automatic control, and can load control instructions into the memory for storage and execution at any time.

[0050] In the above implementation, when it is necessary to control the articulated pin shaft 31 to be inserted into the articulated hole, the telescopic mechanism 20 pushes the guide connecting plate 32 and the articulated pin shaft 31 to extend. At this time, the controller can control the electromagnet 41 to be energized, and make the end of the electromagnet 41 directed towards the magnetic material piece 42 opposite to the magnetic pole of the end of the magnetic material piece 42 directed towards the electromagnet 41. In this way, the electromagnet 41 can be used to attract the guide connecting plate 32, so that the telescopic mechanism 20 is easier to push the articulated pin shaft 31 to move. Moreover, after the articulated pin shaft 31 is pushed to the articulated hole, the magnetic force of the electromagnet 41 on the magnetic material piece 42 can be used to lock the articulated pin shaft 31 in the articulated hole, so as to prevent the articulated pin shaft 31 from easily falling off.

[0051] Figure 3 is a schematic view of the insertion of the first articulated seat 51 and the articulated pin shaft 31 provided by the embodiments of the present disclosure. As shown in Figure 3 The pin pulling device further comprises a first articulated seat 51 and a sliding shaft sleeve 52. The first articulated seat 51 comprises an articulated cylinder 511 and a first support plate 512. The first support plate 512 has a through hole, and the articulated cylinder 511 is coaxially inserted into the through hole and fixedly connected with the first support plate 512.

[0052] As shown in Figure 3 The sliding shaft sleeve 52 is coaxially sleeved in the inner hole of the articulated cylinder 511. The inner wall of the sliding shaft sleeve 52 has an annular groove 521, the outer wall of the articulated cylinder 511 has an oil injection hole 513 penetrating to the annular groove 521, the articulated pin shaft 31 is coaxially inserted into the inner hole of the sliding shaft sleeve, and the outer wall of the articulated pin shaft 31 and the annular groove 521 form a lubricating cavity.

[0053] In the embodiment of the present disclosure, the sliding sleeve 52 can be in interference fit with the hinge barrel 511 to prevent the sliding sleeve 52 from being easily detached from the hinge barrel 511. The inner wall of the sliding sleeve 52 is provided with an annular groove 521, so that after the hinge pin shaft 31 is inserted into the sliding sleeve 52, the annular groove 521 can surround the outer wall of the hinge pin shaft 31 to form a lubricating cavity. The lubricating cavity is in communication with the oil injection hole 513, and lubricating oil can be injected into the lubricating cavity through the oil injection hole 513, so as to lubricate the hinge pin shaft 31, which is conducive to the easier insertion of the hinge pin shaft 31 into the sliding sleeve 52 and improves the insertion efficiency of the hinge pin shaft 31.

[0054] Figure 4 Figure 1 is a partial schematic view of a pin pulling device provided by the present disclosure. As shown in Figure 1, the hinge barrel 511 is provided with an oil injection hole 513. Figure 4

[0055] As shown in Figure 1, the sliding surface 330 of the guide rail 33 has a lubricating groove 34 extending along the arrangement direction of the first side and the second side. Figure 4

[0056] Exemplarily, the lubricating groove 34 of the sliding surface 330 has a plurality of strip-shaped lubricating grooves 34 arranged at intervals.

[0057] As shown in Figure 1, the pin pulling device further comprises an oil delivery pipe, one end of the oil delivery pipe being in communication with the oil injection hole 514, and the other end of the oil delivery pipe being in communication with the lubricating groove 34. Figure 4

[0058] Exemplarily, the oil injection hole 514 can be located at the upper end of the hinge barrel 511 in the vertical direction, so that the lubricating oil will overflow from the oil injection hole 514 only when the oil in the lubricating cavity is filled, that is, the lubricating oil will flow out of the lubricating cavity only after the hinge pin shaft 31 is sufficiently lubricated.

[0059] In the embodiment of the present disclosure, after the lubricating oil overflows from the lubricating cavity, it will flow into the oil delivery pipe from the oil injection hole 514 and be delivered to the lubricating groove 34 of the sliding surface 330 through the oil delivery pipe, so that the guide connecting plate 32 can also be lubricated when it slides on the sliding surface 330, thereby reducing the wear of the guide connecting plate 32 and the guide rail 33.

[0060] Optionally, as shown in Figure 1, the pin pulling device further comprises a second hinge seat 53, and the second hinge seat 53 has a tapered hole 531, and the larger end of the tapered hole 531 is close to the telescopic mechanism 20. Figure 1 As shown in Figure 1, the end of the hinge pin shaft 31 away from the telescopic mechanism 20 is in the shape of a circular truncated cone, and the end of the hinge pin shaft 31 away from the telescopic mechanism 20 is coaxially inserted into the tapered hole 531.

[0061] Figure 1

[0062] ​​​​​In this way, under the horizontal thrust of the telescopic mechanism 20, the hinge pin 31 can be stably installed in the second hinge seat 53 by the tapered hole 531, avoiding the problems of sliding, deviation or extrusion of the hinge pin 31 under the radial force, which further affects the re-extraction or insertion operation of the hinge pin 31.

[0063] Optionally, the conical angle of the tapered hole 531 is less than or equal to 10°.

[0064] Optionally, the conical angle of the tapered hole 531 is less than or equal to 10°.

[0065] Optionally, the conical angle of the tapered hole 531 is less than or equal to 10°.

[0066] Optionally, as shown in FIG. 1, the telescopic mechanism 20 includes an electric push rod 21, a position sensor 22, a sliding block 23, a sliding rod 24, a first limiting rod 25 and a second limiting rod 26. Figure 1

[0067] As shown in FIG. 1, the first limiting rod 25 is located on the cylinder of the electric push rod 21, one end of the first limiting rod 25 is provided with a limiting hole, the second limiting rod 26 is located on the telescopic rod of the electric push rod 21, one end of the sliding rod 24 is connected with one end of the second limiting rod 26, the other end of the sliding rod 24 passes through the limiting hole, the sliding block 23 is fixedly sleeved on the sliding rod 24, and the sliding block 23 is located between the first limiting rod 25 and the second limiting rod 26. Figure 1

[0068] As shown in FIG. 1, the position sensor 22 is located on the first limiting rod 25, and the position sensor 22 is opposite to the sliding rod 24. Figure 1

[0069] In the embodiment of the present disclosure, when the electric push rod 21 works, the telescopic rod of the electric push rod 21 will move up and down. In the retraction process of the telescopic rod, the sliding rod 24 will move to the left side together, and the sliding block 23 fixed on the sliding rod 24 will also move together. When the sliding block 23 moves to the opposite position of the position sensor 22, the distance detected by the position sensor 22 changes.

[0070] ​​​The controller acquires distance data detected by the position sensor 22 in real time. When the distance data is less than a set threshold, it indicates that the sliding block 23 is just moved to be opposite to the position sensor 22, and the telescopic rod of the electric push rod 21 has been retracted to the limit position. At this time, the controller controls the electric push rod 21 to stop retraction.

[0071] Optionally, the length of the guide rail 33 is greater than or equal to the maximum stroke of the telescopic mechanism 20. In this way, it can be ensured that the telescopic mechanism 20 pushes the guide connecting plate 32 to slide on the guide rail 33 during the telescopic process, thereby avoiding wear of the guide connecting plate 32 and the mounting base 10.

[0072] Optionally, a safety gap is reserved between the maximum outer diameter of the hinge pin 31 and the inner hole diameter of the hinge lug. The difference between the maximum outer diameter of the hinge pin 31 and the inner hole diameter of the hinge lug is greater than or equal to 40 mm. This avoids the hinge pin 31 being stuck due to stress deformation of the main structure, installation errors and other factors, affecting the pulling-out or insertion operation of the hinge pin 31.

[0073] The hinge lug is located between the first hinge seat 51 and the second hinge seat 53 on the A-frame, and is used for insertion of the hinge pin 31.

[0074] The present disclosure provides a crane, which comprises the pin pulling device, the A-frame and the turntable as described above. The pin pulling device and the A-frame are located on the turntable.

[0075] Figure 5 is a structural schematic diagram of a crane provided by the present disclosure. As shown in Figure 5 The A-frame comprises a front support rod 81, a first rear pull rod 82, a second rear pull rod 83 and a support rod 85. The first end of the front support rod 81 is hingedly connected to the turntable 70. The second end of the front support rod 81 is hingedly connected to the first end of the first rear pull rod 82. The second end of the first rear pull rod 82 is hingedly connected to the first end of the second rear pull rod 83. The second end of the second rear pull rod 83 is hingedly connected to the turntable 70.

[0076] As shown in Figure 5 The first end of the support rod 85 is hingedly connected to the middle part of the front support rod 81. The second end of the support rod 85 is provided with a guide sliding block 90. The hinge insertion pin is used for insertion into the first hinge seat, the hinge lug and the second hinge seat, so as to hinge the guide sliding block 90 and the hinge seat.

[0077] In the embodiment of the present disclosure, the front support rod 81, the first rear pull rod 82 and the second rear pull rod 83 form an A-shaped frame. Since the first rear pull rod 82 and the second rear pull rod 83 are hinged, under the action of gravity, the two rear pull rods will swing and fall onto the turntable 70 in the state that the front support rod 81 is not fixed, so as to make the A-shaped frame fall down. When the second end of the support rod 85 is hinged to the hinge seat of the turntable 70 through the guide sliding block 90, the support rod 85 fixes the front support rod 81 on the turntable 70, so that the front support rod 81 supports the two rear pull rods, thereby enabling the A-shaped frame to be kept in the state of being pulled up.

[0078] When it is needed to control the A-shaped frame to fall down, the hinge pin is pulled out from the hinge seat and the guide sliding block 90, so that the front support rod 81 can fall down, and at the same time, the second end of the front support rod 81 is pulled by the winch, so that the two rear pull rods swing and fall onto the turntable 70, to complete the falling-down operation of the A-shaped frame.

[0079] When it is needed to control the A-shaped frame to be pulled up, the first car is controlled to release the rope, so that the A-shaped frame is gradually pulled up under the traction of the arm frame 100, and when the guide sliding block 90 slides to the position of the hinge seat, the hinge pin is inserted into the hinge seat and the guide sliding block 90, so as to fix the A-shaped frame on the turntable 70, to complete the pulling-up operation of the A-shaped frame.

[0080] In the embodiment of the present disclosure, during the pulling-up and falling-down of the A-shaped frame, the first rear pull rod 82 and the second rear pull rod 83 can swing relatively, so that when the A-shaped frame falls down, the second rear pull rod 83 can be horizontally placed on the turntable 70, thereby transferring the load of the A-shaped frame in the falling-down state from the hinge position of the second rear pull rod 83 and the turntable 70 to the second rear pull rod 83, so as to reduce the load of the hinge position of the second rear pull rod 83 and the front support rod 81. At the same time, in the pulled-up state of the A-shaped frame, in addition to the hinge position of the second rear pull rod 83 and the front support rod 81 bearing the load, the support rod 85 also interacts with the hinge seat, so that the support rod 85 can also share part of the load, thereby reducing the hinge position of the lower end of the A-shaped frame and the turntable 70, improving the problem of serious wear of the hinge position of the A-shaped frame and the turntable 70, and improving the reliability of the A-shaped frame.

[0081] As shown in Figure 5 The two rollers 91 are arranged on the guide sliding block 90, and the central angle of the arc corresponding to the rotation centers of the two rollers 91 is 90° to 150°.

[0082] By setting the central angle of the arc corresponding to the rotation centers of the two rollers 91 in the above range, the two rollers 91 are distributed on both sides of the first hinge hole 61 of the guide sliding block 90. Figure 2As shown, when the A-frame is in the pulled-up state, the roller 91 on the left side of the guide sliding block 90 can be in rolling contact with the rotating table 70; when the A-frame is in the laid-down state, the roller 91 on the right side of the guide sliding block 90 can be in rolling contact with the rotating table 70. In this way, the A-frame is always in rolling contact with the rotating table 70 by at least one roller 91 regardless of whether it is in the pulled-up or laid-down state, thereby avoiding wear of the guide sliding block 90 during sliding.

[0083] Exemplarily, the central angle of the circle corresponding to the arc of the rotation center of the two rollers 91 can be 120°.

[0084] Optionally, the crane further comprises a guide sliding rail 92, which is located on the rotating table 70, and the guide sliding block 90 is located on the track surface of the guide sliding rail 92. The distance from the track surface to the rotating table 70 gradually decreases in the direction from the first end of the front support rod 81 to the second end of the second rear pull rod 83.

[0085] By setting the track surface of the guide sliding rail 92 as an inclined surface, the guide sliding block 90 can be guided to slide down along the inclined surface, so that the guide sliding block 90 can more smoothly slide from the high place to the low place of the guide sliding rail 92 when the A-frame needs to be laid down.

[0086] At the same time, setting the guide sliding rail 92 instead of the rotating table 70 to contact with the roller 91 can also avoid direct contact between the roller 91 and the rotating table 70, thereby avoiding wear of the rotating table 70.

[0087] In addition, from the pulled-up state to the laid-down state of the A-frame, the guide sliding block 90 will rotate by a certain angle, so that the state of the roller 91 on the left side of the guide sliding block 90 contacting the guide rail counterclockwise rotates to the state of the roller 91 on the right side of the guide sliding block 90 contacting the guide rail. Therefore, by setting the track surface of the guide sliding rail 92 as an inclined surface, the gap between the guide sliding block 90 and the guide rail gradually increases when the guide sliding block 90 slides, which is beneficial to the counterclockwise rotation of the guide sliding block 90 to the state of the roller 91 on the right side of the guide sliding block 90 contacting the guide rail.

[0088] The above is not intended to limit the disclosure in any form, although the disclosure has been disclosed as above through examples, however, it is not intended to limit the disclosure, any person skilled in the art can make some changes or modifications to the equivalent embodiments of the equivalent changes within the scope of the technical solution of the disclosure, but as long as it does not deviate from the content of the technical solution of the disclosure, any simple modification, equivalent change and modification made to the above examples according to the technical essence of the disclosure, all still belong to the scope of the technical solution of the disclosure.

Claims

1. A pin extractor characterized by, The pin pulling device comprises a mounting base (10), a telescopic mechanism (20), a hinged pin shaft (31), a guide connecting plate (32) and a guide rail (33); The telescopic mechanism (20) is located on a mounting surface (11) of the mounting base (10), a telescopic rod of the telescopic mechanism (20) is hinged to a first side edge of the guide connecting plate (32), a second side edge of the guide connecting plate (32) is hinged to the hinged pin shaft (31), and the first side edge and the second side edge are opposite side edges of the guide connecting plate (32); The guide rail (33) is located on the mounting surface (11), a sliding surface (330) of the guide rail (33) is away from the mounting surface (11), the guide connecting plate (32) is located on the sliding surface (330), and a distance from the sliding surface (330) to the mounting surface (11) gradually increases in an arrangement direction from the first side edge to the second side edge, and an included angle between the sliding surface (330) and the mounting surface (11) is 3° to 15°; The pin pulling device further comprises a first hinged seat (51) and a sliding shaft sleeve (52), the first hinged seat (51) comprises a hinged cylinder (511) and a first support plate (512), the first support plate (512) has a through hole, the hinged cylinder (511) is coaxially inserted into the through hole, and the hinged cylinder (511) is fixedly connected with the first support plate (512); The sliding shaft sleeve (52) is coaxially sleeved in an inner hole of the hinged cylinder (511), an inner wall of the sliding shaft sleeve (52) has an annular groove (521), an outer wall of the hinged cylinder (511) has an oil injection hole (513) penetrating to the annular groove (521), the hinged pin shaft (31) is coaxially inserted into an inner hole of the sliding shaft sleeve (52), and an outer wall of the hinged pin shaft (31) and the annular groove (521) form a lubricating cavity.

2. The pin removing device according to claim 1, characterized in that The pin pulling device further comprises an electromagnet (41) and a magnetic material piece (42), the magnetic material piece (42) is located at the second side edge of the guide connecting plate (32), and the electromagnet (41) is located on the mounting surface (11) and at an end of the guide rail (33) away from the first side edge.

3. The pin removing device according to claim 1, characterized in that The outer wall of the hinged cylinder (511) further has an oil delivery hole (514) penetrating to the annular groove (521); The sliding surface (330) of the guide rail (33) has a lubricating groove (34) extending along an arrangement direction of the first side edge and the second side edge; The pin pulling device further comprises an oil delivery pipe, one end of the oil delivery pipe is in communication with the oil delivery hole (514), and the other end of the oil delivery pipe is in communication with the lubricating groove (34).

4. The pin removing device according to claim 1, characterized in that The pin pulling device further comprises a second hinged seat (53), the second hinged seat (53) has a tapered hole (531), and a larger end of the tapered hole (531) is close to the telescopic mechanism (20). The end of the hinge pin shaft (31) away from the telescopic mechanism (20) is frustoconical, and the end of the hinge pin shaft (31) away from the telescopic mechanism (20) is coaxially inserted into the tapered hole (531).

5. The pin removing device according to claim 4, characterized in that The conical angle of the tapered hole (531) is less than or equal to 10°.

6. The pin removing device according to any one of claims 1 to 5, characterized in that The telescopic mechanism (20) comprises an electric push rod (21), a position sensor (22), a sliding block (23), a sliding rod (24), a first limiting rod (25) and a second limiting rod (26). The first limiting rod (25) is located on the cylinder barrel of the electric push rod (21), one end of the first limiting rod (25) is provided with a limiting hole, the second limiting rod (26) is located on the telescopic rod of the electric push rod (21), one end of the sliding rod (24) is connected with one end of the second limiting rod (26), the other end of the sliding rod (24) penetrates through the limiting hole, the sliding block (23) is fixedly sleeved on the sliding rod (24) and located between the first limiting rod (25) and the second limiting rod (26). The position sensor (22) is located on the first limiting rod (25), and the position sensor (22) is opposite to the sliding rod (24).

7. A pin removing device according to any one of claims 1 to 5, characterized in that The length of the guide rail (33) is greater than or equal to the maximum stroke of the telescopic mechanism (20).

8. A crane, characterized in that The crane comprises the pin pulling device, the A-shaped frame and the rotary table according to any one of claims 1 to 7, and the pin pulling device and the A-shaped frame are both located on the rotary table.

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