JP2018104108A - crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent irregular winding during wire rope taking-up.SOLUTION: A crane is provided with a winch device that takes up a wire rope on a winch drum via a guide sheave. The winch drum is provided with a traverse mechanism for reciprocating the guide sheave along the axial direction of the winch drum according to the taking-up position of the wire rope on the winch drum. The traverse mechanism is provided with a traverse shaft that is rotated interlockingly with the rotation of the winch drum, and a support that reciprocates along with the rotation of the traverse shaft and supports the guide sheave.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technique for preventing random winding when winding a wire rope in a winch device of a crane.

  In a winch device that winds or unwinds a wire rope, when winding or unwinding, there is no suspended load, or there is no load on the wire rope due to the grounding of the hook block, etc., and the wire rope loosens, Alternatively, it is widely known that so-called “turbulent winding” occurs in which the arrangement of the wire rope is disturbed on the winch drum due to the tolerance of the wire rope diameter, wear of the wire rope due to use, twisting, etc. .

  In Patent Document 1, a first detector that detects the movement of the rope, a second detector that detects the operation of the winch device, and a slack that detects the looseness of the rope by comparing the movement of the rope and the operation of the winch device. And detecting the rotation speed of the winch drum based on the speed difference between the detected rope moving speed and the winch device rope feeding speed, thereby causing the turbulent winding during the wire rope feeding. A technique for preventing the above is disclosed.

Japanese Patent Laying-Open No. 2006-166091

  In the technique disclosed in Patent Document 1, a rope is wound around a winch drum via a guide sheave supported swingably on a shaft member, and the guide sheave swings following the movement of the wound wire rope. Just do it. That is, the guide sheave does not have a function of positively controlling the winding position on the winch drum, and it is difficult to reliably prevent disturbance of the rope arrangement on the winch drum.

  A crane including a winch device that winds a wire rope around a winch drum via a guide sheave, wherein the winch device is adapted to wind the guide sheave on the winch drum in accordance with a winding position of the wire rope around the winch drum. A traverse mechanism that reciprocates along the axial direction is provided.

  The traverse mechanism includes a traverse shaft that rotates in conjunction with the rotation of the winch drum, and a support that reciprocates with the rotation of the traverse shaft and supports the guide sheave.

  According to the present invention, it is possible to reliably prevent turbulent winding during winding of a wire rope.

Crane side view Top view of winch device Side view of winch device The top view which shows another embodiment of a winch apparatus Side view showing another embodiment of the winch device

  With reference to FIG. 1, the whole structure of a crane is demonstrated. FIG. 1 is a side view showing the overall configuration of the crane 1. In the present embodiment, the crane 1 is described as a mobile crane, but the present invention can be similarly applied to any crane provided with a winch device that winds / feeds a wire rope.

  The crane 1 includes a vehicle body 2 for traveling and a crane device 3 that is transported by the vehicle body 2. The crane 1 can be moved to an unspecified place by the vehicle body 2 on which the crane device 3 is mounted. The vehicle body 2 includes outriggers 4 disposed at four corners. The crane 1 is a mobile crane that lifts a conveyed object by operating the crane device 3 in a state where the outrigger 4 is installed and the vehicle body 2 is fixed.

  The crane apparatus 3 includes a swivel base 5, a boom 6, a cab 7, a jib 8, a main hook block 9, a sub hook block 10, a hoisting cylinder 11, a main winch 12, a main wire rope 13, a sub winch 14, a sub wire rope 15, and the like. Is provided.

  The swivel base 5 constitutes the crane device 3 so as to be turnable, and is provided on the frame of the vehicle body 2 via an annular bearing. The boom 6 is composed of a plurality of boom members, and is configured to be extendable and retractable by moving each boom member. The boom 6 supports the wire ropes 13 and 15, and supports the wire ropes 13 and 15 in a state in which a conveyed product can be lifted by expanding and contracting the boom 6. The main hook block 9 and the sub hook block 10 are suspended from the wire ropes 13 and 15, respectively.

  The cab 7 is provided on the side of the base end portion of the boom 6. Various operating tools such as a steering handle, a working lever, a button, and the like, and a display device that indicates the operating state of the crane 1 are provided in the room. Etc. are arranged. The jib 8 is connected to the boom head 16 at the tip of the boom 6 and expands the lift and work radius of the crane device 3. The hoisting cylinder 11 is a hydraulic cylinder, and elongates and contracts to raise and lower the boom 6 and hold the posture of the boom 6.

  The main winch 12 is a hydraulic winch device, and winds and feeds the main wire rope 13. By operating the main winch 12, the main hook block 9 is moved up and down. The sub winch 14 is a hydraulic winch device, and winds and feeds the sub wire rope 15. By operating the sub winch 14, the sub hook block 10 is moved up and down.

  Next, a specific configuration of the winch device will be described with reference to FIGS. The winch device in the following description refers to a main winch 12 that winds / feeds the main wire rope 13 and a sub winch 14 that winds / feeds the sub wire rope 15. Since the main winch 12 and the sub winch 14 have substantially the same configuration, the following description will be made as a winch device 20 that winds / feeds the wire rope 21 around the winch drum 22.

  The winch device 20 winds or feeds the wire rope 21 around the winch drum 22 via a guide sheave 23. The guide sheave 23 is supported so as to be swingable along the axial direction of the sheave shaft 24.

  The winch device 20 is provided with a traverse mechanism 30 that reciprocates the guide sheave 23 along the axial direction of the sheave shaft 24. The traverse mechanism 30 includes a traverse shaft 31 and a support 32 that reciprocates on the traverse shaft 31 as the traverse shaft 31 rotates.

  The traverse shaft 31 is rotatably supported by a bearing 33. The rotational power of the winch drum 22 is transmitted to the traverse shaft 31 via a power transmission tool 34 such as a belt, a chain, or a gear. That is, the traverse shaft 31 is configured to rotate in conjunction with the rotation of the winch drum 22. Intersecting spiral grooves 35 are provided on the outer periphery of the traverse shaft 31. The spiral groove 35 is composed of two grooves directed in both directions, a groove from one end to the other end of the traverse shaft 31 and a groove from the other end to the one end, and the spiral direction is opposite in the end portion. It is formed to become.

  The support 32 extends from the traverse shaft 31 toward the sheave shaft 24 and holds the guide sheave 23 from both ends. That is, as the support 32 moves, the guide sheave 23 moves. A slider (not shown) that moves along the spiral groove 35 is fixed to the support 32 inside the traverse shaft 31.

  In the traverse mechanism 30 configured as described above, the support 32 is moved by moving the slider of the support 32 along the spiral groove 35 by rotating the traverse shaft 31 to which the rotation of the winch drum 22 is transmitted. Reciprocates along the axial direction of the traverse shaft 31. As the support 32 reciprocates, the guide sheave 23 reciprocates on the sheave shaft 24.

  Here, the shaft diameter of the traverse shaft 31 and the groove pitch of the spiral groove 35 provided in the traverse shaft 31 are such that the support 32 moves by the dimension of the diameter of the wire rope 21 for each rotation of the winch drum 22. Set to That is, after the winch drum 22 is rotated once and one wire rope 21 is wound, the guide sheave 23 is set to a position corresponding to the winding position of the next row.

  As described above, according to the traverse mechanism 30, when the wire rope 21 is wound by the winch drum 22, the guide sheave 23 is moved to an appropriate winding position on the winch drum 22, thereby winding the wire rope 21. Actively controlling the picking position. As a result, it is possible to reliably prevent irregular winding during winding.

  Next, another embodiment of the winch device will be described with reference to FIGS. 4 and 5. The traverse mechanism 30 is particularly effective at the time of winding in a state where no load is applied to the wire rope 21 such as a state where there is no suspended load by actively controlling the arrangement of the wire rope 21. The winch device 40 according to the present embodiment performs winding / unwinding without passing through the traverse mechanism 50 in a state where a load is applied to the wire rope 21.

  The winch device 40 winds / feeds the wire rope 21 through two guide sheaves, that is, a guide sheave 23 supported by the sheave shaft 24 and a second guide sheave 41 disposed on the tip side of the guide sheave 23. The second guide sheave 41 is supported by the second sheave shaft 42 and is swingable in the axial direction of the second sheave shaft 42.

  The winch device 40 reciprocates the guide sheave 23 along the axial direction of the sheave shaft 24 while the wire rope 21 is unloaded, and the guide sheave 23 is moved to the wire rope 21 while the wire rope 21 is loaded. 21 is provided with a traverse mechanism 50 that is retracted from the vehicle 21. The traverse mechanism 50 includes a traverse shaft 31 in which a spiral groove 35 is formed, a support 32 that reciprocates the traverse shaft 31 in the axial direction, a power transmission tool 34 that transmits rotational power to the traverse shaft 31, and a traverse shaft 31. A swing arm 51 that connects the sheave shaft 24 of the guide sheave 23 and swings the sheave shaft 24 is provided.

  The swing arm 51 can move the sheave shaft 24 in a direction away from the path of the wire rope 21 by an appropriate actuator. That is, the guide sheave 23 can be moved away from the wire rope 21 by operating the swing arm 51. The actuator that drives the swing arm 51 is operated by an operator's manual operation or by automatic control by detecting a load applied to the wire rope 21.

  The traverse mechanism 50 moves the swing arm 51 in accordance with the load on the wire rope 21, thereby guiding with the two guide sheaves of the guide sheave 23 and the second guide sheave 41 and guiding only with the second guide sheave 41. Switching.

  As described above, the winch device 40 according to the present embodiment includes the traverse mechanism 50 having the swing arm 51 that retracts the guide sheave 23 from the wire rope 21 in accordance with the load applied to the wire rope 21. Switching at load. In such a configuration, when no load is applied, the traverse mechanism 50 can satisfactorily prevent the wire rope 21 from being randomly wound, and when loaded, the guide sheave 23 is retracted from the path of the wire rope 21 and the second guide sheave 41 is retracted. The only way to take up is.

  Further, as another configuration for performing switching between loading and non-loading with respect to the traverse mechanism, a clutch for switching presence / absence of power transmission to the traverse shaft 31 is provided, and the traverse shaft 31 can be rotated by disengaging the clutch when loaded. It is also possible to adopt a configuration that selectively stops the function of the traverse mechanism.

  1: Crane, 12: Main winch (winch device), 13: Main wire rope (wire rope), 14: Sub winch (winch device), 15: Sub wire rope (wire rope), 20: Winch device, 21: Wire Rope, 22: winch drum, 23: guide sheave, 24: sheave shaft, 30: traverse mechanism, 31: traverse shaft, 32: support, 35: spiral groove

Claims (2)

A crane equipped with a winch device for winding a wire rope around a winch drum via a guide sheave,
The crane includes a traverse mechanism that reciprocates the guide sheave along an axial direction of the winch drum in accordance with a winding position of the wire rope around the winch drum.   The traverse mechanism includes: a traverse shaft that is rotated in conjunction with rotation of the winch drum; and a support that reciprocates as the traverse shaft rotates and supports the guide sheave. crane.

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