JP2020023384A - Rope irregular winding prevention device for winch - Google Patents

Abstract

To provide a rope irregular winding prevention device for a winch capable of ensuring prevention of rope irregular winding.SOLUTION: This rope irregular winding prevention device for a winch is provided with; a movable sheave 51 which is provided so as to be movable in the rotational axis direction of a winch drum 24a and on which a rope 22 wound on the winch drum 24a is hung; and a resistance application mechanism 52 for applying resistance to the rotational axis force of the winch drum 24a applied to the movable sheave 51. Thus, the movable sheave 51 is enabled to follow the moving speed of the rope 22 during normal taking-up of the rope 22, and the movement of the rope 22 at a speed causing jumping of the rope 22 wound on the winch drum 24a can be suppressed. Thus, prevention of irregular winding of the rope 22 can be ensured.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a winch rope turbulence prevention device used for a crane device, for example.

  Generally, a winch drum of a winch applied to a crane device has a winding drum portion and flange portions provided on both sides in the rotation axis direction of the winding drum portion, and is spirally wound in the rotation axis direction with respect to the winding drum portion. A rope is wound around the shape. The rope wound around the winch drum is sent to the winch drum via a sheave provided at the end of the boom. The rope wound on the winch drum is orthogonal to the direction in which the rope extends between the sheave and the winch drum and the rotation axis of the winch drum as the position of the rotation axis direction wound around the winding drum becomes closer to the flange portion. The angle formed by the direction becomes large. When the angle between the direction in which the rope extends and the direction perpendicular to the rotation axis of the winch drum increases, the force acting on the rope wound around the winch drum toward the center of the winch drum in the rotation axis direction increases. Become. For this reason, in the winch drum, when the rope is wound around a position close to the flange portion, a force toward the center in the rotation axis direction acts on the rope to be wound, and the rope jumps around the winch drum. May be generated to cause turbulence.

  Therefore, as a rope wrap prevention device for preventing the rope wound around the winch drum, the pressing roller for pressing the rope wound around the winch drum from the outer peripheral side, and the pressing roller are rotated. 2. Description of the Related Art There is known a device having a rotating shaft freely supported and a torsion spring attached to the rotating shaft (for example, see Patent Document 1).

  In the rope turbulence prevention device, the rope turbulence prevention device urges the pressing roller toward the outer peripheral surface of the winch drum by the elastic force of the torsion spring, so that the rope wrap around the winch drum is disturbed. Winding is prevented.

WO 2015/063939

  In the rope turbulence prevention device, a constant force by a torsion spring acts on the rope wound around the winch drum. For this reason, in the rope turbulence prevention device, when the rope moves in the rotation axis direction at a speed greater than the movement speed of the rope winding position in the rotation axis direction during a normal rope winding operation, The rope moves largely in the direction of the rotation axis according to the moving speed. In this case, in the winch drum, there is a possibility that the rope wound around the winding drum portion jumps and becomes turbulent.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a winch rope unwinding prevention device capable of reliably preventing the rope from being unwinded.

  In order to achieve the above object, the winch rope turbulence prevention device of the present invention is movable in the rotation axis direction of the winch drum near the outer peripheral side of the winch drum around which the rope is helically wound in the rotation axis direction. A movable sheave on which a rope wound around the winch drum is provided, and a hydraulic resistance applying mechanism that applies resistance to the force in the rotation axis direction of the winch drum acting on the movable sheave, It has.

  As a result, the force of the rope moving in the rotation axis direction at a speed greater than the movement speed in the rotation axis direction of the rope winding position during the normal rope winding operation with respect to the rope wound around the winch drum. Acts, the hydraulic sheave applies a larger resistance than the normal sheave of the rope to the movable sheave, and thus the normal sheave of the rope. The movable sheave follows the moving speed of the rope at the time, and the movement of the rope at such a speed that the rope wound around the winch drum jumps is suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, while making a movable sheave follow the moving speed of the rope at the time of the winding operation of a normal rope, suppressing the movement of the rope of the speed at which the jump of the rope wound around a winch drum occurs. Therefore, it is possible to reliably prevent the occurrence of the rope turbulence.

It is a side view of a mobile crane showing a 1st embodiment of the present invention. It is a figure explaining a fleet angle. It is a schematic structure figure of a winch drum and a turbulence prevention device. It is a schematic structure figure of a winch drum and a turbulence prevention device showing a 2nd embodiment of the present invention. It is a schematic structure figure of a winch drum and a turbulence prevention device showing a 3rd embodiment of the present invention.

  1 to 3 show a first embodiment of the present invention.

  As shown in FIG. 1, a mobile crane 1 to which a winch rope turbulence prevention device of the present invention is applied includes a vehicle body 10 for traveling on a general road or a work area, and a crane for performing crane work. The vehicle 20 includes a device 20 and a cab 30 for running the vehicle body 10 and performing a crane operation by the crane device 20. The crane device 20 and the cab 30 are supported by a swivel 40 capable of turning horizontally with respect to the vehicle body 10, the crane device 20 is arranged on one side in the width direction of the swivel 40, and the cab 30 is arranged on the other side in the width direction. ing.

  The vehicle body 10 includes wheels 11 provided on both sides in the width direction of the front side and the rear side, and outriggers 12 provided in front of the front wheels 11 and behind the rear wheels 11. The vehicle body 10 runs by the driving force of the engine.

  The crane device 20 is provided so as to be able to move up and down with respect to the vehicle body 10 and is extendable and contractible, a rope 22 extending along the extendable boom 21 and hanging down from a tip end of the extendable boom 21, A hook block 23 locked to a rope 22 suspended from the tip, a winch 24 for winding and unwinding the rope 22, and a rope 22 for a winch drum described later when the rope 22 is wound by the winch 24 And a rope turbulence prevention device 50 for preventing turbulence.

  The winch 24 is provided at a position adjacent to the base end of the telescopic boom 21 on the swivel 40. The winch 24 has a winch drum 24a around which the rope 22 is wound. The winch drum 24a performs a winding operation and an unwinding operation of the rope 22 by a hydraulic winch motor (not shown).

  As shown in FIG. 2, the winch drum 24a has a cylindrical winding drum 24a1 extending along the rotation center axis, and flanges 24a2 provided at both axial ends of the winding drum 24a1. I have. As shown in FIG. 3, the rope 22 is helically wound around the outer periphery of the winding drum portion 24a1 between the pair of flange portions 24a2 so as to be adjacent to the outer periphery of the winding drum portion 24a1 without any gap in the rotation axis direction. It is wound so as to form a layer on the radially outer side.

  Here, as shown in FIG. 1, a sheave 21 a for guiding a rope 22 extended from the winch drum 24 a and hanging from the tip of the telescopic boom 21 is rotatably provided at the distal end of the telescopic boom 21. Have been. The relationship between the sheave 21a and the winch drum 24a needs to satisfy a so-called fleet angle in order to suppress the occurrence of irregular winding of the rope 22 around the winch drum 24a. As shown in FIG. 2, the fleet angle is a line A connecting the center of the sheave 21a in the rotation axis direction and the center of the winch drum 24a in the rotation axis direction, and the line A connecting the center of the sheave 21a in the rotation axis direction and the winch drum 24a. An angle θ formed by a line B connecting the inner surface of the flange portion 24a2 in the rotation axis direction (the end in the rotation axis direction of the range around which the rope 22 can be wound). When the rope groove is formed in the winding drum portion 24a1 of the winch drum 24a, the angle θ is within 4 degrees, for example, and when the rope groove is not formed, the angle θ is within 2 degrees. The position relationship with the winch drum 24a and the dimension of the winch drum 24a in the rotation axis direction are determined.

  As shown in FIG. 3, the rope turbulence prevention device 50 includes a movable sheave 51 provided movably in the rotation axis direction of the winch drum 24a in the vicinity of the outer peripheral side of the winch drum 24a. And a resistance applying mechanism 52 for applying a resistance to the movable sheave 51 with respect to the acting force in the direction of the rotation axis.

  In the movable sheave 51, a groove in which the rope 22 is engaged is formed in the outer peripheral portion in the circumferential direction, and the rope 22 located between the winch drum 24a and the sheave 21a is hung above the winch drum 24a. The movable sheave 51 is rotatably supported by a support shaft 51a extending parallel to the rotation axis of the winch drum 24a, and is provided movably along the support shaft 51a.

  The resistance applying mechanism 52 includes a pair of connection belts 53 each having one end connected to one end surface and the other end surface of the movable sheave 51 in the axial direction, a plurality of pulleys 54 around which the pair of connection belts 53 are wound, The other ends of the connection belts 53 are connected to a pair of hydraulic cylinders 55 connected to a piston rod, a communication path 56 for connecting the respective cylinder tubes of the pair of hydraulic cylinders 55 to each other, and a communication path 56. A flow control valve 57 as a resistance adjusting mechanism for adjusting the flow rate of the hydraulic oil.

  The cylinder tubes of the pair of hydraulic cylinders 55 and the plurality of pulleys 54 are respectively fixed to members on the swivel 40 side. Each of the pair of hydraulic cylinders 55 expands and contracts in conjunction with the movable sheave 51 that moves along the support shaft 51a. When a force in the direction of extension acts on one hydraulic cylinder 55 by the operation of the movable sheave 51, the hydraulic oil flows from the other hydraulic cylinder 55 into the one hydraulic cylinder 55 via the communication path 56. Thus, one hydraulic cylinder 55 performs an extension operation, and the other hydraulic cylinder 55 performs a reduction operation. Here, when the hydraulic oil flows from the other hydraulic cylinder 55 to the one hydraulic cylinder 55, a flow resistance is generated in the hydraulic oil flowing through the communication passage 56, so that the hydraulic oil flows to the movable sheave 51 in the axial direction. Resistance is given. The resistance force applied to the movable sheave 51 increases as the speed of input to the movable sheave 51 in the axial direction increases. In addition, by adjusting the ease of flow of the hydraulic oil flowing from the other hydraulic cylinder 55 to the one hydraulic cylinder 55 by the flow control valve 57, the resistance applied to the movable sheave 51 is adjusted.

  When the rope 22 is wound by the winch 24 in the mobile crane 1 configured as described above, the winch motor is driven to move the rope 22 sent from the distal end to the proximal end of the telescopic boom 21. Is wound around the winding drum portion 24a1 of the winch drum 24a. At this time, the rope 22 wound around the winding drum portion 24a1 is wound so as to be adjacent in the axial direction without a gap. When the rope 22 wrapped around the winding drum portion 24a1 is wrapped from one end to the other end of the winding drum portion 24a1, the rope 22 changes its axial direction to be wrapped, and ends at one end from the other end of the winding drum portion 24a1. It is wrapped around the part. The rope 22 wound around the winding drum portion 24a1 is wound so as to form a layer on the radially outer side of the rope 22 already wound.

  Here, the movable sheave 51 with which the rope 22 wound by the winch 24 is engaged has a force that moves in the axial direction along with the movement of the rope 22 on the winch drum 24a in the axial direction. Works.

  At this time, in the resistance applying mechanism 52, a force in the extension direction acts on one hydraulic cylinder 55. When a force in the extension direction acts on one of the hydraulic cylinders 55, hydraulic oil flows from the other hydraulic cylinder 55 into the one hydraulic cylinder 55 via the communication path 56, and simultaneously the one hydraulic cylinder 55 performs the extension operation. , The other hydraulic cylinder 55 performs a reducing operation.

  Since the force of the moving speed in the rotation axis direction of the winding position of the rope 22 during the normal winding operation of the rope 22 acts on the movable sheave 51, the resistance applied by the resistance applying mechanism 52 is small. , Axial movement is allowed.

  Further, when the rope 22 is wound by the winch 24, when the rope 22 is wound around a portion of the winding drum portion 24 a 1 near the flange portion 24 a 2, the end (the sheave 21 a) of the telescopic boom 21 faces the winch drum 24 a. The rope 22 is sent obliquely. For this reason, the rope 22 wound around the portion close to the flange portion 24a2 has a normal winding of the rope, which may cause irregular winding such as jumping of the rope 22 toward the axial center portion of the winding drum portion 24a1. In some cases, a force that moves at a speed greater than the moving speed of the winding position of the rope during operation may act.

  Here, a force that moves at a large speed in the axial direction acts on the movable sheave 51 with which the rope 22 wound by the winch 24 is engaged, but the resistance applied by the resistance applying mechanism 52 is not applied. Since the size of the movable sheave 51 increases, the movement of the movable sheave 51 in the axial direction is restricted, and the behavior of the rope 22 such as jumping is suppressed.

  When adjusting the resistance force applied to the movable sheave 51, the valve opening of the flow control valve 57 is adjusted.

  As described above, according to the winch rope turbulence prevention device of the present embodiment, the movable sheave 51 provided movably in the rotation axis direction of the winch drum 24a and on which the rope 22 wound around the winch drum 24a is hung, A hydraulic resistance applying mechanism 52 for applying a resistance to a force acting on the movable sheave 51 in the rotation axis direction of the winch drum 24a.

  Thereby, the movable sheave 51 follows the moving speed of the rope 22 during the normal winding operation of the rope 22, and the movement of the rope 22 at a speed at which the rope 22 wound around the winch drum 24a jumps occurs. Since it can be suppressed, it is possible to reliably prevent the occurrence of turbulence of the rope 22.

  The resistance applying mechanism 52 has a flow rate adjusting valve 57 as a resistance adjusting mechanism capable of adjusting the magnitude of the resistance applied to the movable sheave 51.

  Thus, the same resistance applying mechanism 52 can be applied to different types of winches, so that manufacturing costs can be reduced.

  In addition, the resistance applying mechanism 52 is a communication passage that connects the pair of hydraulic cylinders 55 each having a piston rod connected to both sides in the rotation axis direction of the movable sheave 51 and the respective cylinder tubes of the pair of hydraulic cylinders 55 to each other. And the communication passage 56 has a flow control valve 57 capable of adjusting the opening area of the communication passage 56.

  Thereby, the resistance force applied to the movable sheave 51 is generated by the pair of hydraulic cylinders 55 provided on both sides of the movable sheave 51 in the axial direction, and thus one or the other in the axial direction of the movable sheave 51. It becomes possible to apply an equal resistance to each movement.

  FIG. 4 shows a second embodiment of the present invention.

  The pair of hydraulic cylinders 55 of the resistance applying mechanism 52 of the present embodiment are arranged such that the distal ends of the piston rods face each other. Further, the movable sheave 51 does not have the support shaft 51a in the above-described embodiment, and is rotatably supported between the distal ends of the piston rods of the pair of hydraulic cylinders 55.

  In the resistance applying mechanism 52 configured as described above, the pair of hydraulic cylinders 55 respectively expand and contract by the movement of the movable sheave 51 and apply the resistance to the movable sheave 51 as in the above-described embodiment. I do.

  As described above, according to the winch rope turbulence prevention device of the present embodiment, the movable sheave 51 follows the moving speed of the rope 22 during the normal winding operation of the rope 22 as in the above-described embodiment. Since the movement of the rope 22 at a speed at which the rope 22 wound around the winch drum 24a jumps can be suppressed, it is possible to reliably prevent the rope 22 from being randomly wound.

  FIG. 5 shows a third embodiment of the present invention.

  The resistance applying mechanism 52 of the present embodiment does not have the pair of hydraulic cylinders 55 in the first and second embodiments, but has one hydraulic damper 58.

  The hydraulic damper 58 is filled with hydraulic oil in spaces on both sides of a piston in a cylinder tube, and the spaces on both sides communicate with each other through a communication passage 58a. The communication path 58a is provided with a flow rate adjusting section 58b for adjusting the flow rate of the hydraulic oil flowing through the communication path 58a.

  The movable sheave 51 is rotatably supported at the end of the piston rod of the hydraulic damper 58.

  In the resistance applying mechanism 52 configured as described above, the hydraulic damper 58 performs the expansion and contraction operation by moving the movable sheave 51, and applies the resistance to the movable sheave 51 as in the above-described embodiment.

  As described above, according to the winch rope turbulence prevention device of the present embodiment, the movable sheave 51 follows the moving speed of the rope 22 during the normal winding operation of the rope 22 as in the above-described embodiment. Since the movement of the rope 22 at a speed at which the rope 22 wound around the winch drum 24a jumps can be suppressed, it is possible to reliably prevent the rope 22 from being randomly wound.

  In addition, in the said embodiment, although the rope turbulence prevention apparatus 50 used for the winch 24 of the mobile crane 1 was shown, it is not limited to this. The winch to which the present invention can be applied may be a fixed winch for moving cargo or a ship, or a winch hung on a structure to load goods.

  Further, in the third embodiment, the case where the hydraulic damper 58 is used to impart a resistance to the movable sheave 51 has been described, but the present invention is not limited to this. A hydraulic rotary damper may be used as long as it can apply resistance to the movement of the movable sheave 51 in the rotation axis direction.

  22: rope, 24: winch, 24a: winch drum, 50: rope turbulence prevention device, 51: movable sheave, 52: resistance applying mechanism, 55: hydraulic cylinder, 56: communication passage, 57: flow control valve.

Claims (3)

In the vicinity of the outer periphery of the winch drum around which the rope is helically wound in the rotation axis direction, a movable sheave is provided movably in the rotation axis direction of the winch drum, and the rope wound around the winch drum is hung,
A winch rope turbulence prevention device, comprising: a hydraulic resistance applying mechanism for applying resistance to a force in the rotation axis direction of a winch drum acting on a movable sheave. The winch rope turbulence prevention device according to claim 1, wherein the resistance applying mechanism has a resistance adjusting mechanism capable of adjusting the magnitude of the resistance applied to the movable sheave. The resistance applying mechanism has a pair of hydraulic cylinders each having a piston rod connected to both sides of the movable sheave in the rotation axis direction, and a communication passage that communicates each cylinder tube of the pair of hydraulic cylinders with each other,
The winch rope turbulence prevention device according to claim 2, wherein the resistance force adjusting mechanism has a valve provided in the communication passage and capable of adjusting an opening area of the communication passage.