Pin pulling device and crane

Abstract

The invention 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, a telescopic mechanism, a hinge pin shaft, a guide connecting plate and a guide rail, the telescopic mechanism is located on the mounting face of the mounting base, a telescopic rod of the telescopic 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, and the first side edge and the second side edge are the two opposite side edges of the guide connecting plate. The guide rail is located on the installation face, the sliding face of the guide rail is far away from the installation face, the guide connecting plate is located on the sliding face, and the distance from the sliding face to the installation face is gradually increased in the arrangement direction from the first side edge to the second side edge. The coaxiality of the pin shaft and the pin hole is guaranteed, and the pulling and inserting efficiency of the pin shaft is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of offshore lifting machinery, and in particular to a pin pulling device and 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, a lowering device is usually set to control the lowering of the A-frame to lower the height of the crane A-frame so that the ship can safely pass through the bridge on the river.

[0003] In the related art, when the A-frame is being laid down or raised, it is often necessary to pull out or insert the pin that connects the A-frame to the crane turntable. The crane turntable is usually equipped with a pin pulling device to control the pulling out and insertion of the pin. The pin pulling device includes an electric push rod and a pin. The electric push rod is fixed on the crane turntable. The telescopic rod of the electric push rod is connected to one end of the pin, thereby controlling the extension and retraction of the pin.

[0004] Since the pin shaft has a long travel path and the pin shaft itself has a certain weight, the pin shaft tends to move downward under the influence of gravity when the electric push rod pushes the pin shaft out, which affects the coaxiality between the pin shaft and the hinge hole, thereby reducing the efficiency of pin shaft insertion and extraction. Summary of the invention

[0005] The embodiment of 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 efficiency of pulling out and inserting the pin shaft. The technical solution is as follows:

[0006] The embodiment of the present disclosure provides a pin pulling device, which includes: a mounting base, a telescopic mechanism, a hinge pin, a guide connecting plate and a guide rail; the telescopic mechanism is located on the mounting surface of the mounting base, the telescopic rod of the telescopic mechanism is hinged to the first side of the guide connecting plate, the second side of the guide connecting plate is hinged to the hinge pin, the first side and the second side are two opposite sides 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, and the distance from the sliding surface to the mounting surface gradually increases in the arrangement direction from the first side to the second side.

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

[0008] In another implementation of the embodiment of the present disclosure, the pin pulling device also includes a first articulated seat and a sliding sleeve, the first articulated seat includes an articulated cylinder and a first support plate, the first support plate has a through hole, the articulated cylinder is coaxially inserted in the through hole, and the articulated cylinder is fixedly connected to the first support plate; the sliding sleeve is coaxially sleeved in the inner hole of the articulated cylinder, the inner wall of the sliding sleeve has an annular groove, the outer wall of the articulated cylinder has an oil filling hole that passes through the annular groove, the articulated pin shaft is coaxially inserted in the inner hole of the sliding sleeve, and the outer wall of the articulated pin shaft and the annular groove form a lubrication cavity.

[0009] In another implementation of the embodiment of the present disclosure, the outer wall of the hinge cylinder also has an oil hole that penetrates to the annular groove; the sliding surface of the guide rail has a lubrication groove extending along the arrangement direction of the first side edge and the second side edge; the pin pulling device also includes an oil pipe, one end of the oil pipe is connected to the oil hole, and the other end of the oil pipe is connected to the lubrication groove.

[0010] In another implementation of the embodiment of the present disclosure, the pin pulling device also includes a second hinge seat, the second hinge seat has a tapered hole, and the larger end of the tapered hole is close to the telescopic mechanism; the end of the hinge pin shaft away from the telescopic mechanism is frustoconical, and the end of the hinge pin shaft away from the telescopic mechanism is coaxially inserted in the tapered hole.

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

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

[0013] In another implementation 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 of the embodiment of the present disclosure, the included angle between the sliding surface and the mounting surface is 3° to 15°.

[0015] An embodiment of the present disclosure provides a crane, which includes the pin pulling device, an A-frame and a turntable as described above, wherein the pin pulling device and the A-frame are both located on the turntable.

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

[0017] The pin pulling device provided by the embodiment of the present disclosure is provided with a guide connecting plate between the telescopic rod and the hinge pin of the telescopic mechanism, so that the telescopic rod and the hinge pin are respectively hinged on two opposite sides of the guide connecting plate. At the same time, a guide track is provided on the mounting base, and the guide connecting plate is located on the sliding surface of the guide track, and the distance from the sliding surface to the mounting surface gradually increases in the arrangement direction from the first side to the second side. That is, the sliding surface is set as an inclined surface. In this way, when the telescopic rod of the telescopic mechanism pushes the hinge pin to move, the guide connecting plate will gradually move upward along the inclined surface, that is, the guide connecting plate will push the hinge pin connected thereto to move upward. Therefore, it can effectively compensate for the error of the articulated pin shaft moving downward due to gravity factors; because the longer the telescopic rod is extended, the greater the effect of gravity on the downward movement of the articulated pin shaft, and at this time, the distance that the guide connecting plate moves along the sliding surface is also longer, and correspondingly, the guide track compensates for the downward movement of the articulated pin shaft more. Therefore, the guide track and the guide connecting plate are set for use together to ensure the coaxiality of the articulated pin shaft and the articulated hole, thereby improving the efficiency of the pin shaft being pulled out and inserted. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

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

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

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

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

[0023] Figure 5 It is a structural schematic diagram of a crane provided in an embodiment of the present disclosure.

[0024] The descriptions of the marks in the figure are 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 limit rod; 26. second limit rod;

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

[0028] 41. Electromagnet; 42. Magnetic material parts;

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

[0030] 52. sliding sleeve; 521. annular groove;

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

[0032] 70. Turntable;

[0033] 81. front support rod; 82. first rear tie rod; 83. second rear tie rod; 85. support rod;

[0034] 90. guide slide block; 91. roller; 92. guide rail;

[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 the structure of a pin pulling device provided by an embodiment of the present disclosure. Figure 1 As shown, the pin pulling device includes: a mounting base 10 , a telescopic mechanism 20 , a hinge pin shaft 31 , a guide connecting plate 32 and a guide rail 33 .

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

[0040] like Figure 1 As shown, the guide rail 33 is located on the mounting surface 11, the 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 the distance from the sliding surface 330 to the mounting surface 11 gradually increases in the arrangement direction from the first side to the second side.

[0041] The pin pulling device provided in the embodiment of the present disclosure is provided with a guide connecting plate 32 between the telescopic rod and the hinge pin 31 of the telescopic mechanism 20, so that the telescopic rod and the hinge pin 31 are respectively hinged on two opposite sides of the guide connecting plate 32. At the same time, a guide track 33 is provided on the mounting base 10, and the guide connecting plate 32 is located on the sliding surface 330 of the guide track 33, and the distance from the sliding surface 330 to the mounting surface 11 gradually increases in the arrangement direction from the first side to the second side. That is, the sliding surface 330 is set as an inclined surface. In this way, when the telescopic rod of the telescopic mechanism 20 pushes the hinge pin 31 to move, the guide connecting plate 32 will gradually move upward along the inclined surface, that is, the guide connecting plate 32 will push the hinge pin 31 connected thereto to move upward. Therefore, it can effectively compensate for the error of the hinge pin 31 moving downward due to gravity. Since the longer the telescopic rod is extended, the greater the effect of gravity on the downward movement of the hinge pin 31. At this time, the distance that the guide connecting plate 32 moves along the sliding surface 330 is also longer, and correspondingly, the guide track 33 and the guide connecting plate 32 are used together to ensure the coaxiality of the hinge pin 31 and the hinge hole, thereby improving the efficiency of the pin insertion and extraction.

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

[0043] As an example, in the embodiment of the present disclosure, the included 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, and when the telescopic rod of the telescopic mechanism 20 pushes the hinge pin 31 to move, the guide connecting plate 32 will gradually move upward along the inclined surface, that is, the guide connecting plate 32 will push the hinge pin 31 connected thereto to move upward, thereby effectively compensating for the error of the hinge pin 31 moving downward due to gravity.

[0044] Figure 2 FIG. 1 is a partial schematic diagram of a pin pulling device provided by an embodiment of the present disclosure. Figure 2 As shown, the pin pulling device further includes an electromagnet 41 and a magnetic material piece 42 . The magnetic material piece 42 is located on the second side of the guide connecting plate 32 . The electromagnet 41 is located on the mounting surface 11 and at one end of the guide track 33 away from the first side.

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

[0046] The magnet has a first pole and a second pole with opposite magnetic properties. When placing the magnetic part, one of the first pole and the second pole of the magnet is controlled to be opposite to the electromagnet 41, and the other of the first pole and the second pole of the magnet is made to face away from the electromagnet.

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

[0048] In the disclosed embodiment, the pin pulling device also includes a controller, which is electrically connected to the electromagnet 41. The controller can control the current direction of the coil wound on the iron core of the electromagnet 41, and by changing the current direction of the coil, the electromagnet 41 is switched to a different magnetic pole toward one end of the magnetic material piece 42.

[0049] 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.

[0050] In the above implementation, when the hinge pin 31 needs to be inserted into the hinge hole, the telescopic mechanism 20 pushes the guide connecting plate 32 and the hinge pin 31 to extend. At this time, the controller can control the electromagnet 41 to be energized, and the end of the electromagnet 41 facing the magnetic material 42 is opposite to the end of the magnetic material 42 facing the electromagnet 41, so that the electromagnet 41 can be used to attract the guide connecting plate 32, making it easier for the telescopic mechanism 20 to push the hinge pin 31 to move; and when the hinge pin 31 is pushed to the hinge hole, the magnetic force of the electromagnet 41 on the magnetic material 42 can be used to lock the hinge pin 31 in the hinge hole to prevent the hinge pin 31 from falling off easily.

[0051] Figure 3 FIG. 5 is a schematic diagram of the insertion of a first hinge seat 51 and a hinge pin 31 provided in an embodiment of the present disclosure. Figure 3 As shown, the pin pulling device also includes a first hinge seat 51 and a sliding sleeve 52. The first hinge seat 51 includes a hinge tube 511 and a first support plate 512. The first support plate 512 has a through hole. The hinge tube 511 is coaxially inserted in the through hole, and the hinge tube 511 is fixedly connected to the first support plate 512.

[0052] like Figure 3 As shown, the sliding sleeve 52 is coaxially sleeved in the inner hole of the hinge cylinder 511, the inner wall of the sliding sleeve 52 has an annular groove 521, the outer wall of the hinge cylinder 511 has an oil filling hole 513 that passes through the annular groove 521, the hinge pin 31 is coaxially inserted in the inner hole of the sliding sleeve, and the outer wall of the hinge pin 31 and the annular groove 521 form a lubrication cavity.

[0053] In the disclosed embodiment, the sliding sleeve 52 can be interference fit with the hinge tube 511 to prevent the sliding sleeve 52 from being easily loosened from the hinge tube 511. The inner wall of the sliding sleeve 52 is provided with an annular groove 521, so that after the hinge pin 31 is inserted into the sliding sleeve 52, the annular groove 521 can form a lubrication cavity with the outer wall of the hinge pin 31. The lubrication cavity is connected to the oil injection hole 513, and lubricating oil can be injected into the lubrication cavity through the oil injection hole 513, thereby lubricating the hinge pin 31, which is conducive to the hinge pin 31 being more easily inserted into the sliding sleeve 52, and the plugging and unplugging efficiency of the hinge pin 31 is improved.

[0054] Figure 4 FIG. 1 is a partial schematic diagram of a pin pulling device provided by an embodiment of the present disclosure. Figure 4 As shown, the outer wall of the hinge cylinder 511 also has an oil delivery hole 514 that penetrates to the annular groove 521 .

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

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

[0057] like Figure 4 As shown, the pin pulling device further includes an oil delivery pipe, one end of which is connected to the oil delivery hole 514 , and the other end of which is connected to the lubrication groove 34 .

[0058] Exemplarily, the oil delivery hole 514 can be located at the upper end of the hinge cylinder 511 in the vertical direction, so that the lubricating oil will overflow from the oil delivery 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 31 is fully lubricated.

[0059] In the disclosed embodiment, after the lubricating oil overflows from the lubrication chamber, it will flow into the oil pipe from the oil hole 514 and be transported to the lubrication groove 34 of the sliding surface 330 through the oil pipe. In this way, the guide connecting plate 32 can also be lubricated when sliding on the sliding surface 330, thereby reducing the wear of the guide connecting plate 32 and the guide rail 33.

[0060] Alternatively, if Figure 1 As shown, the pin pulling device further includes 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 .

[0061] like Figure 1 As shown, the end of the hinge pin 31 away from the telescopic mechanism 20 is in a truncated cone shape, and the end of the hinge pin 31 away from the telescopic mechanism 20 is coaxially inserted in the tapered hole 531 .

[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 using the tapered hole 531, avoiding factors such as the ship's inclination angle and structural deformation, which may cause the hinge pin 31 to slip to one side, deviate or be squeezed out under the action of radial force, thereby affecting the re-pulling or insertion operation of the hinge pin 31.

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

[0064] The cone angle of the tapered hole 531 may be the angle between the inner wall of the tapered hole 531 and the central axis of the tapered hole 531 .

[0065] As an example, in the embodiment of the present disclosure, the cone angle of the cone hole 531 may be 6°. The cone angle of the cone hole 531 is set within the above range, so that the hinge pin 31 can easily slide to a state coaxial with the cone hole 531, avoiding the problem of the hinge pin 31 sliding to one side, deflecting or squeezing out under the radial force due to factors such as the ship's inclination angle and structural deformation, thereby affecting the re-extraction or insertion operation of the hinge pin 31.

[0066] Alternatively, if Figure 1 As shown, 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 .

[0067] like Figure 1 As shown, the first limiting rod 25 is located on the cylinder of the electric push rod 21, one end of the first limiting rod 25 has 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 to 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 mounted on the sliding rod 24, and the sliding block 23 is located between the first limiting rod 25 and the second limiting rod 26.

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

[0069] In the disclosed embodiment, when the electric push rod 21 is working, the telescopic rod of the electric push rod 21 will telescope and move. During the retraction of the telescopic rod, the sliding rod 24 will be driven to move to the left, and the sliding block 23 fixed on the sliding rod 24 will also be fixed and move together. When the sliding block 23 moves to the position sensor 22, the distance detected by the position sensor 22 changes.

[0070] Among them, the controller will obtain the distance data detected by the position sensor 22 in real time. When the distance data is less than the set threshold, it indicates that the sliding block 23 has just moved to the position sensor 22, and the telescopic rod of the electric push rod 21 has been retracted to the extreme position. At this time, the controller controls the electric push rod 21 to stop retracting.

[0071] Optionally, the length of the guide rail 33 is greater than or equal to the maximum stroke of the telescopic mechanism 20. This ensures that the telescopic mechanism 20 can always push the guide connecting plate 32 to slide on the guide rail 33 during the telescopic process, thereby preventing the guide connecting plate 32 and the mounting base 10 from being worn.

[0072] Optionally, a certain safety gap should be reserved between the maximum outer diameter of the hinge pin 31 and the inner diameter of the hinge lug plate. The difference between the maximum outer diameter of the hinge pin 31 and the inner diameter of the hinge lug plate is greater than or equal to 40 mm. This prevents the hinge pin 31 from being stuck due to deformation of the main structure, installation error, and other factors, which may affect the extraction or insertion operation of the hinge pin 31.

[0073] The hinged ear plate is located on the A-shaped frame, and the hinged ear plate is arranged between the first hinge seat 51 and the second hinge seat 53 for inserting the hinge pin shaft 31 .

[0074] An embodiment of the present disclosure provides a crane, which includes the pin pulling device, the A-frame and the turntable as described above, wherein the pin pulling device and the A-frame are both located on the turntable.

[0075] Figure 5 Schematic diagram of a crane structure provided by an embodiment of the present disclosure. Figure 5 As shown, the A-frame includes: 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 hinged to the turntable 70, the second end of the front support rod 81 is hinged to the first end of the first rear pull rod 82, the second end of the first rear pull rod 82 is hinged to the first end of the second rear pull rod 83, and the second end of the second rear pull rod 83 is hinged to the turntable 70.

[0076] like Figure 5 As shown, the first end of the support rod 85 is hinged at the middle of the front support rod 81, and the second end of the support rod 85 is provided with a guide slider 90, and the hinge pin is used to be inserted into the first hinge seat, the hinge ear plate and the second hinge seat to hinge the guide slider 90 and the hinge seat.

[0077] In the disclosed embodiment, 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, when the front support rod 81 is not fixed, the two rear pull rods will swing and fall onto the turntable 70 under the action of gravity, so that the A-shaped frame can be laid down. When the second end of the support rod 85 is hinged to the hinge seat of the turntable 70 through the guide slider 90, the support rod 85 fixes the front support rod 81 on the turntable 70, allowing the front support rod 81 to support the two rear pull rods, so that the A-shaped frame can be kept in a pulled-up state.

[0078] When the A-frame needs to be controlled to be folded down, the hinge pin is pulled out from the hinge seat and the guide slider 90, so that the front support rod 81 can be folded down. 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 A-frame folding operation.

[0079] When it is necessary to control the A-frame 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 100. When the guide slider 90 slides to the position of the hinge seat, the hinge pin is inserted into the hinge seat and the guide slider 90, so as to fix the A-frame on the turntable 70 to complete the A-frame pulling operation.

[0080] In the implementation of the present disclosure, when the A-shaped frame is pulled up and laid down, since the first rear pull rod 82 and the second rear pull rod 83 can swing relative to each other, when the A-shaped frame is laid down, the second rear pull rod 83 can be placed horizontally on the turntable 70, so that the load of the A-shaped frame in the laid-down state is transferred from the hinge of the second rear pull rod 83 and the turntable 70 to the second rear pull rod 83, so that the load at the hinge of the second rear pull rod 83 and the front support rod 81 can be reduced. At the same time, when the A-shaped frame is in the pulled-up state, in addition to the load borne by the hinge of the second rear pull rod 83 and the front support rod 81, the support rod 85 is also connected to 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 severe wear of the hinge position of the A-shaped frame and the turntable 70, and improving the reliability of the A-shaped frame.

[0081] For example, Figure 5 As shown, two rollers 91 are provided on the guide slider 90, and the central angle of the arc passing through 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 center of the two rollers 91 within the above range, the two rollers 91 are distributed on both sides of the first hinge hole 61 of the guide slider 90. Figure 2As shown, when the A-shaped frame is in the pulled-up state, the roller 91 on the left side of the guide slider 90 can roll in contact with the turntable 70; when the A-shaped frame is in the laid-down state, the roller 91 on the right side of the guide slider 90 can roll in contact with the turntable 70. In this way, whether the A-shaped frame is in the pulled-up state or laid-down state, at least one roller 91 always rolls in contact with the turntable 70, thereby preventing the guide slider 90 from being worn during the sliding process.

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

[0084] Optionally, the crane also includes a guide rail 92, which is located on the turntable 70, and the guide slider 90 is located on the track surface of the guide rail 92. From the first end of the front support rod 81 to the second end of the second rear pull rod 83, the distance from the track surface to the turntable 70 gradually decreases.

[0085] By setting the track surface of the guide rail 92 as an inclined surface, the guide slider 90 can be guided to slide downward along the inclined surface. In this way, when the A-frame needs to be laid down, the guide slider 90 can slide more smoothly from the high point of the guide rail 92 to the low point.

[0086] At the same time, the guide rail 92 is provided to replace the turntable 70 to contact the roller 91 , which can also prevent the roller 91 from directly contacting the turntable 70 and wearing the turntable 70 .

[0087] Furthermore, from the pulled-up state to the laid-down state of the A-frame, the guide slider 90 rotates a certain angle, so that the roller 91 on the left side of the guide slider 90 rotates counterclockwise from the state in which the roller 91 on the right side of the guide slider 90 contacts the guide track to the state in which the roller 91 on the left side of the guide slider 90 contacts the guide track. Therefore, the track surface of the guide rail 92 is set as an inclined surface, so that when the guide slider 90 slides, the gap between the guide slider 90 and the guide track gradually increases, which is conducive to the guide slider 90 rotating counterclockwise to the state in which the roller 91 on the right side of the guide slider 90 contacts the guide track.

[0088] 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 pin pulling device, characterized in that: The pin pulling device comprises: a mounting base (10), a telescopic mechanism (20), a hinge pin shaft (31), a guide connecting plate (32) and a guide track (33); The telescopic mechanism (20) is located on the mounting surface (11) of the mounting base (10); the telescopic rod of the telescopic mechanism (20) is hinged to a first side edge of the guide connecting plate (32); the second side edge of the guide connecting plate (32) is hinged to the hinge pin (31); the first side edge and the second side edge are two opposite sides 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 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.

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

3. The pin pulling device according to claim 1, characterized in that: The pin pulling device further comprises a first hinge seat (51) and a sliding sleeve (52); the first hinge seat (51) comprises a hinge tube (511) and a first support plate (512); the first support plate (512) has a through hole; the hinge tube (511) is coaxially inserted in the through hole; and the hinge tube (511) is fixedly connected to the first support plate (512); The sliding sleeve (52) is coaxially sleeved in the inner hole of the hinge tube (511), the inner wall of the sliding sleeve (52) has an annular groove (521), the outer wall of the hinge tube (511) has an oil filling hole (513) penetrating to the annular groove (521), the hinge pin shaft (31) is coaxially inserted in the inner hole of the sliding sleeve (52), and the outer wall of the hinge pin shaft (31) and the annular groove (521) form a lubrication cavity.

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

5. The pin pulling device according to claim 1, characterized in that: The pin pulling device further comprises a second hinge seat (53), wherein 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); The end of the hinge pin (31) away from the telescopic mechanism (20) is in the shape of a truncated cone, and the end of the hinge pin (31) away from the telescopic mechanism (20) is coaxially inserted in the tapered hole (531).

6. The pin pulling device according to claim 5, characterized in that: The cone angle of the tapered hole (531) is less than or equal to 10°.

7. The pin pulling device according to any one of claims 1 to 6, 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 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 to 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 is 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).

8. The pin pulling device according to any one of claims 1 to 6, characterized in that: The length of the guide track (33) is greater than or equal to the maximum stroke of the telescopic mechanism (20).

9. The pin pulling device according to any one of claims 1 to 6, characterized in that: The included angle between the sliding surface (330) and the mounting surface (11) is 3° to 15°.

10. A crane, characterized in that: The crane comprises the pin pulling device according to any one of claims 1 to 9, an A-frame and a turntable, wherein the pin pulling device and the A-frame are both located on the turntable.

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