WO2017149847A1

WO2017149847A1 - Wire rope entanglement prevention structure for crane device

Info

Publication number: WO2017149847A1
Application number: PCT/JP2016/083835
Authority: WO
Inventors: 真輔神田
Original assignee: 株式会社タダノ
Priority date: 2016-02-29
Filing date: 2016-11-15
Publication date: 2017-09-08
Also published as: JP2017154827A; JP6339611B2

Abstract

The present invention provides a wire rope entanglement prevention structure for a crane device, the wire rope entanglement prevention structure being capable of preventing a plurality of vertical extension parts from becoming entangled with each other even when the interval between a hook block suspending a load and the tip end of a boom is great. The present invention is provided with an interval maintaining member 50 for maintaining an interval between a plurality of vertical extension parts 22a of a wire rope 22, and the interval holding member 50 moves in the vertical direction between a boom head 21b and a hook block 24 in response to a change in the interval between the boom head 21b and the hook block 24.

Description

Crane equipment wire rope entanglement prevention structure

The present invention relates to a wire rope entanglement prevention structure of a crane apparatus applied to, for example, a mobile crane.

A conventional crane apparatus is known that includes a boom, a winch, a wire rope that is wound around the winch and is suspended from the tip of the boom, and a hook block that is suspended from the wire rope.

In the crane apparatus, a wire rope extending from one end of the boom tip portion and the hook block to the other side of the boom tip portion and at least the hook block of the boom block is changed in direction so as to extend from the other to the one side. A sheave is provided, and a wire rope suspended from the tip of the boom is hung around the sheave and the end of the wire rope is fixed to the tip of the boom or the hook block.

In the crane apparatus, when the wire rope is fed out and wound up by the winch, the hook block moves in the vertical direction according to the principle of the moving pulley (for example, see Patent Document 1).

Japanese Utility Model Publication No. 5-40289

In the crane apparatus, a plurality of vertically extending portions that are portions extending in the vertical direction between the tip of the boom and the hook block in the wire rope are configured between the tip of the boom and the hook block.

Since the wire rope is formed by twisting a plurality of hard steel wires, twisting occurs when a tensile force is applied, and twisting occurs when the tensile force is not applied. Therefore, in the crane apparatus, when the distance between the hook block and the tip of the boom is increased in a state where the load is suspended on the hook block, each vertical extending portion is twisted back, so that a plurality of vertical extending portions are formed. There is a possibility that a state where the two become entangled with each other may occur. The state in which a plurality of vertically extending portions are entangled with each other is likely to occur in an intermediate portion in the vertical direction of the vertically extending portion.

An object of the present invention is to provide a wire rope for a crane apparatus that can prevent a plurality of vertically extending portions from being entangled with each other even when a distance between a hook block that hangs a load and a tip portion of a boom is large. The object is to provide an anti-tangling structure.

In order to achieve the above object, the present invention provides a winch, a wire rope that is wound around the winch and whose tip side is suspended from a predetermined position, a hook block that is suspended from the wire rope, a predetermined position side, and a hook block side A wire rope extending from one of the predetermined position side and the hook block side to the other and changing the direction so as to extend from the other to the other, and is suspended from the predetermined position. A crane that moves the hook block up and down by hanging the wire rope around the sheave, fixing the end of the wire rope to the predetermined position side or the hook block side, and performing the wire rope unwinding operation and winding operation by the winch In the device, a machine located between the predetermined position and the hook block. A distance holding member that holds a plurality of vertically extending portions that are portions extending in the up-down direction of the yarope is provided, and the distance holding member is provided with a predetermined position and a hook according to a change in a distance between the predetermined position and the hook block. Move up and down between blocks.

As a result, even when the interval between the predetermined position and the hook block changes, the interval holding member can be always positioned on the intermediate portion side between the predetermined position and the hook block. Since the distance between the intermediate parts in the vertical direction is held by the distance holding member, the distance between the plurality of vertical extending parts is maintained in the vertical direction.

According to the present invention, since the interval between the vertical intermediate portions of the plurality of vertically extending portions is held by the interval holding member, the interval between the plurality of vertically extending portions can be maintained in the vertical direction. Even when the distance between the hook block from which the load is suspended and the tip of the boom is large, it is possible to prevent the plurality of vertically extending portions from being entangled with each other.

It is a side view of the mobile crane which shows 1st Embodiment of this invention. It is a figure explaining a wire rope tangle prevention structure. It is a figure explaining the structure of a space | interval holding member. It is a figure explaining operation | movement of a space | interval holding member. It is a figure which shows the structure of the space | interval holding member which shows 2nd Embodiment of this invention. It is a figure explaining operation | movement of a space | interval holding member. It is a figure which shows the other example of a space | interval holding member. It is a figure which shows the other example of a space | interval holding member. The other example of a space | interval holding member is shown, (a) is the figure which looked at the space | interval holding member from upper direction, (b) is the figure which looked at the space | interval holding member from the side.

1 to 4 show a first embodiment of the present invention.

As shown in FIG. 1, a mobile crane 1 having a wire rope entanglement preventing structure according to the present invention includes a vehicle body 10 for traveling in a general road or work area, and a crane apparatus 20 for performing crane work. And a cab 30 for operating the vehicle body 10 and operating the crane work by the crane device 20. The crane device 20 and the cab 30 are supported by a turntable 40 that can turn in the horizontal direction with respect to the vehicle body 10, the crane device 20 is arranged on one side in the width direction of the turntable 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 on the front side and the rear side, and outriggers 12 provided on the front side of the front side wheel 11 and the rear side of the wheel 11 on the rear side. The vehicle body 10 travels by rotating the wheels 11 with 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, a telescopic boom 21 that is telescopic, a wire rope 22 that extends along the telescopic boom 21 and hangs down from the distal end of the telescopic boom 21, and a wire rope 22. A winch 23 for winding and unwinding and a hook block 24 suspended from a wire rope 22 suspended from the distal end of the telescopic boom 21.

The telescopic boom 21 is composed of a plurality of boom members 21a formed in a cylindrical shape, and boom members 21a adjacent to the distal end side are accommodated in the boom members 21a excluding the most distal side. The telescopic boom 21 is configured such that the boom member 21a adjacent to the distal end side is movable with respect to the boom member 21a excluding the most distal side, and the boom member 21a except for the most proximal end side is removed by a hydraulic telescopic cylinder (not shown). The expansion and contraction is performed by moving it. In addition, the base end portion of the most proximal end boom member 21a is connected to the swivel base 40 so as to be rotatable in the vertical direction. A hydraulic hoisting cylinder (not shown) is connected between the substantially central portion in the extending direction of the boom member 21a on the most proximal end side and the swivel base 40, and the telescopic boom 21 is hoisted by the hoisting operation of the hoisting cylinder. I do.

Further, a boom head 21b as a predetermined position where the wire rope 22 is suspended is provided at the tip of the boom member 21a on the most advanced side. A guide sheave 21c for guiding the wire rope 22 extending along the upper surface of the telescopic boom 21 downward is provided on the upper side of the boom head 21b in a state where the telescopic boom 21 extends and contracts in the horizontal direction. ing. Also, a top sheave 21d for hanging the wire rope 22 between the boom head 21b and the hook block 24 is disposed below the boom head 21b with the rotation axis directed in the width direction of the boom head 21b. .

The wire rope 22 is formed by twisting a plurality of strands formed by twisting hard steel wires around a core rope. When the tensile force acts on the wire rope 22, twisting occurs with respect to the state where the tensile force does not act due to twisting back.

The winch 23 has a winch drum 23a having flanges formed at both ends in the axial direction, and a wire rope 22 is wound around the winch drum 23a. The winch drum 23a is rotatably supported by the swivel base 40, and performs a winding operation and a feeding operation of the wire rope 22 by a hydraulic winch motor (not shown).

As shown in FIG. 2, the hook block 24 is rotatably supported between a pair of side plates 24a, a hook 24b provided at a lower portion of the pair of side plates 24a, and a pair of side plates 24a via a support shaft. Hook sheave 24c.

In the mobile crane 1 configured as described above, the moving speed of the hook block 24 relative to the winding speed of the wire rope 22, the wire rope 22, depending on how the wire rope 22 is wound between the boom head 21 b and the hook block 24. The amount of movement of the hook block 24 with respect to the amount of hoisting, and the tensile force of the wire rope 22 necessary for lifting the hook block 24 and the suspended load change.

For example, as shown in FIG. 2, when the wire rope 22 extending downward from the guide sheave 21c is folded back by the hook sheave 24c and the end portion is fixed to the boom head 21b, the hook with respect to the winding speed of the wire rope 22 is secured. The moving speed of the block 24, the moving amount of the hook block 24 with respect to the winding amount of the wire rope 22, and the tensile force of the wire rope 22 necessary for lifting the hook block 24 and the suspended load are respectively compared with the case of single hook. A half.

Further, in the three-hanging state in which the wire rope 22 extending downward from the guide sheave 21c is folded back in the order of the hook sheave 24c and the top sheave 21d and the end portion is fixed to the hook block 24, the moving speed and moving amount of the hook block 24, The tensile force of the wire rope 22 is 1/3 each compared with the case of single hook.

Further, when the wire rope 22 extending downward from the guide sheave 21c is folded in the order of the hook sheave 24c, the top sheave 21d, and the hook sheave 24c and the end portion is fixed to the boom head 21b, the moving speed of the hook block 24 and The amount of movement and the pulling force of the wire rope 22 are each ¼ compared to the case of single hook.

As described above, by increasing the number of the wire ropes 22 between the boom head 21b and the hook block 24, the moving speed of the hook block 24 with respect to the winding speed of the wire rope 22 is reduced, and the winding amount of the wire rope 22 is increased. The amount of movement of the hook block 24 relative to the wire is reduced, and the tensile force of the wire rope 22 necessary for lifting the hook block 24 and the suspended load is reduced.

In addition, the wire rope 22 positioned between the boom head 21b and the hook block 24 when the number of the wire ropes 22 between the boom head 21b and the hook block 24 is two or more is shown in FIG. As described above, a plurality of vertically extending portions 22a, which are portions extending in the vertical direction between the boom head 21b and the hook block 24, are configured at intervals.

In the state where the number of the wire ropes 22 is two or more, when the weight of the hook block 24 and the suspended load acts as a tensile force on each vertically extending portion 22a of the wire rope 22, the wire rope 22 is twisted back to each vertically extending portion 22a. It may occur and a behavior may occur in which a plurality of vertically extending portions 22a are entangled with each other.

Therefore, the wire rope 22 positioned between the boom head 21b and the hook block 24 has a plurality of vertically extending portions 22a, as shown in FIG. An interval holding member 50 is provided for preventing the portions 22a from being entangled with each other.

As shown in FIGS. 2 and 3, the interval holding member 50 is provided on the vertically extending portion 22 a where the wire rope 22 moves toward one side in the vertical direction when the hook block 24 is moved toward one side in the vertical direction. A first sheave 51 that rolls in contact and a second sheave 52 that rolls in contact with a vertically extending portion 22a that does not move including the end of the wire rope 22 fixed to the boom head 21b or the hook block 24. is doing.

The first sheave 51 has a predetermined first pitch circle diameter D1 as shown in FIG. The first sheave 51 has a first wire pressing roller 51a for pressing the wire rope 22 in contact with the outer peripheral groove from the outside. The first sheave 51 can be rolled by the first wire pressing roller 51a without causing displacement or slippage with respect to the wire rope 22.

As shown in FIG. 3, the second sheave 52 has a second pitch circle diameter D2 smaller than the first pitch circle diameter D1. The second sheave 52 includes a second wire pressing roller 52a for pressing the wire rope 22 in contact with the outer peripheral groove from the outside. The second sheave 52 can be rolled by the second wire pressing roller 52 a without causing any deviation or slippage with respect to the wire rope 22. Further, the second sheave 52 is fixed to the first sheave 51 at a position where the rotation shaft overlaps the rotation shaft of the first sheave 51 in the axial direction, and rotates with the first sheave 51.

The first and second

wire pressing rollers

51 a and 52 a are fixed to a bracket 53 that is rotatably supported on the rotation shafts of the first sheave 51 and the second sheave 52.

The bracket 53 is provided with a light 53a that illuminates the hook block 24 from above as a device used during crane work.

In the wire rope entanglement prevention structure of the mobile crane 1 configured as described above, the operation of the spacing member 50 when the number of the wire ropes 22 between the boom head 21b and the hook block 24 is two. explain. When the number of multiplication is two, the second pitch circle diameter D2 is a half of the first pitch circle diameter D1.

When the wire rope 22 wound around the winch 23 is fed out or wound up at a predetermined speed V, the hook block 24 is half the speed V of the wire rope 22 as shown in FIG. / 2) Move up and down.

At this time, in the spacing member 50, the first sheave 51 is in contact with one vertical extending portion 22a in which the wire rope 22 moves in the vertical direction. For this reason, the first sheave 51 receives a rotational force at a speed V of the wire rope 22. On the other hand, the second sheave 52 is in contact with the other non-moving vertical extending portion 22a whose upper end is fixed to the boom head 21b. For this reason, the 2nd sheave 52 rotates with the 1st sheave 51, and moves to the up-and-down direction along the other up-and-down extension part 22a. Here, the second sheave 52 rotates at the same angular velocity as the first sheave 51. For this reason, if the second pitch circle diameter D2 is the same as the first pitch circle diameter D1 of the first sheave 51, the first sheave 51 and the second sheave 52 are half the speed V of the wire rope 22. It moves along the other vertical extending portion 22a at a speed of 1 (V / 2). However, since the second pitch circle diameter D2 of the second sheave 52 is a half of the first pitch circle diameter D1 of the first sheave 51, the spacing member 50 is a wire rope as shown in FIG. It moves along the other vertical extending part 22a at a speed (V / 4) that is a quarter of the speed V of 22. That is, the spacing member 50 moves in the vertical direction at a speed (V / 4) that is a half of the speed (V / 2) in which the hook block 24 moves in the vertical direction. As a result, the spacing member 50 is always located at an intermediate portion between the boom head 21b and the hook block 24 when the hook block 24 moves in the vertical direction. Therefore, the interval holding member 50 holds the interval between the plurality of vertical extending portions 22a regardless of the distance between the boom head 21b and the hook block 24. Occurrence of entanglement between 22a is suppressed.

Thus, according to the wire rope entanglement preventing structure of the present embodiment, the gap holding member 50 for holding the gap between the plurality of vertically extending portions 22a of the wire rope 22 is provided, and the gap holding member 50 is used as the boom head 21b. In accordance with the change in the distance between the hook block 24 and the hook block 24, the boom head 21b and the hook block 24 are moved in the vertical direction.

Thereby, since the space | interval holding member 50 hold | maintains the space | interval of the intermediate part of the up-down direction of several vertical extending | stretching part 22a, it can hold | maintain a mutual space | interval over the up-down direction of several vertical extending part 22a. Even when the distance between the hook block 24 from which the load is suspended and the boom head 21b is large, it is possible to prevent the plurality of vertically extending portions 22a from being entangled with each other.

The spacing member 50 also includes a first sheave 51 that rolls in contact with the vertically extending portion 22a in which the wire rope 22 moves toward one of the vertical directions when the hook block 24 is moved in one of the vertical directions. And the second sheave 52 that rolls in contact with the vertically extending portion 22a where the wire rope 22 does not move when the hook block 24 is moved in one of the up and down directions, the first sheave 51 and the second sheave 52. Are moved in the vertical direction between the boom head 21b and the hook block 24.

As a result, the interval holding member 50 can be moved in conjunction with the drawing operation and the winding operation of the wire rope 22 by the winch 23. Therefore, the interval holding member 50 can be moved without requiring a dedicated power source. It is possible to reduce the manufacturing cost and weight.

Further, the first sheave 51 and the second sheave 52 have a first pitch circle diameter D1 and a second pitch circle diameter D2 that are different from each other, and are linked to each other at positions where the respective rotation centers overlap in the axial direction. To do.

Thereby, since the mechanism for moving the spacing member 50 can be configured simply, it is possible to reduce the manufacturing cost and the weight.

Further, the spacing member 50 is located at an intermediate portion between the hook block 24 moving in the vertical direction and the boom head 21b.

Thereby, since the mutual space | interval of the some up-and-down extending part 22a located in the intermediate part of the hook block 24 and boom head 21b which are easy to produce an entanglement can be maintained, the entanglement of the wire rope 22 can be prevented reliably. Is possible.

Further, a light 53a for illuminating the hook block 24 from above is attached to the spacing member 50.

Thereby, since it becomes possible to install the apparatus used in the case of a crane work between the boom head 21b and the hook block 24, without requiring a member for exclusive use, holding down installation cost, It becomes possible to improve safety and work efficiency during crane work.

5 and 6 show a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected and shown to the component similar to the said embodiment.

As shown in FIGS. 5 and 6, the interval holding member 50 of the present embodiment has the first sheave 51 and the wire rope 22 of the hook block 24 when the multiplication factor of the wire rope 22 is set to 4 or more. The second sheave 52 is brought into contact with the vertically extending portion 22a that moves in the direction opposite to the direction in which the wire rope 22 moves, with the vertically extending portion 22a moving in the moving direction.

In the wire rope entanglement prevention structure of the mobile crane 1 configured as described above, the operation of the spacing member 50 when the number of the wire ropes 22 is four will be described. When the number of multiplications of the wire rope 22 is 4, the second pitch circle diameter D2 of the second sheave 52 is 5/3 of the first pitch circle diameter D1.

When the wire rope 22 wound around the winch 23 is fed out or wound up at a predetermined speed V, the hook block 24 suspended from the wire rope 22 by four hooks, as shown in FIG. It moves up and down at a speed (V / 4) that is a quarter of the speed V.

At this time, in the spacing member 50, the first sheave 51 is in contact with the vertically extending portion 22a that moves in the direction in which the hook block 24 moves. For this reason, the first sheave 51 receives a rotational force at a speed V of the wire rope 22. On the other hand, the second sheave 52 is in contact with the vertically extending portion 22a that moves in the direction opposite to the direction in which the hook block 24 moves. For this reason, the second sheave 52 receives the rotational force at the speed V of the wire rope 22 in the direction opposite to the rotational direction received by the first sheave 51. Here, the second sheave 52 is configured integrally with the first sheave 51 and rotates at the same angular velocity as the first sheave 51. Therefore, if the second pitch circle diameter D2 is the same as the first pitch circle diameter D1 of the first sheave 51, the first sheave 51 and the second sheave 52 have the vertically extending portion 22a that the first sheave 51 contacts. And the vertical extending portion 22a with which the second sheave is in contact without rotating in the vertical direction. However, since the second pitch circle diameter D2 of the second sheave 52 is five thirds of the first pitch circle diameter D1 of the first sheave 51, the second sheave 52 having a larger circumference than the first sheave 51. The spacing member 50 moves in the direction of rolling while contacting the wire rope 22. Thereby, the space | interval holding member 50 moves at the speed (V / 8) of 1/8 of the speed V of the wire rope 22 toward the direction to which the hook block 24 moves. In other words, the spacing member 50 moves in the vertical direction at a speed (V / 8) that is a half of the speed (V / 4) in which the hook block 24 moves in the vertical direction. As a result, the spacing member 50 is always located at an intermediate portion between the boom head 21b and the hook block 24 when the hook block 24 moves in the vertical direction. Therefore, the interval holding member 50 holds the interval between the plurality of vertical extending portions 22a regardless of the distance between the boom head 21b and the hook block 24. Occurrence of entanglement between 22a is suppressed.

Thus, according to the wire rope entanglement prevention structure of the present embodiment, the interval holding member 50 holds the intervals between the intermediate portions in the vertical direction of the plurality of vertically extending portions 22a, as in the above-described embodiment. Since the plurality of vertically extending portions 22a can maintain their distances in the vertical direction, even when the distance between the hook block 24 and the boom head 21b from which the load is suspended is large, the plurality of vertically extending portions 22a It becomes possible to prevent entanglement with each other.

The spacing member 50 also includes a first sheave 51 that rolls in contact with the vertically extending portion 22a in which the wire rope 22 moves toward one of the vertical directions when the hook block 24 is moved in one of the vertical directions. A second sheave 52 that rolls in contact with the vertically extending portion 22a in which the wire rope 22 moves toward the other in the vertical direction when the hook block 24 is moved in the vertical direction. By moving the sheave 51 and the second sheave 52 together, the boom head 21b and the hook block 24 are moved in the vertical direction.

As a result, the interval holding member 50 can be moved in conjunction with the drawing operation and the winding operation of the wire rope 22 by the winch 23. Therefore, the interval holding member 50 can be moved without requiring a dedicated power source. It is possible to reduce the manufacturing cost.

In the above embodiment, the crane device 20 of the mobile crane 1 is shown. However, the present invention is applied to a tower crane as long as it has a structure that hangs a hook block with a multiple of two or more. Alternatively, the present invention may be applied to an overhead crane or a portal crane that does not have a boom.

In the above-described embodiment, as the equipment used in the crane work, a light 53a that illuminates the hook block 24 from above is provided on the spacing member 50. However, the present invention is not limited to this. For example, a camera for monitoring the hook from above, a repeater used when performing wireless communication between the hook block 24 and the telescopic boom 21 can be attached to the spacing member 50.

In the above embodiment, the first sheave 51 and the second sheave 52 are coupled to each other by fixing the rotation shafts of the first sheave 51 and the second sheave 52. However, the present invention is not limited to this. Is not something For example, the rotation speed of the first sheave 51 and the second sheave 52 is converted by a power transmission member 54 comprising a combination of a belt 54a and a pulley 54b shown in FIG. 7 (a) or a gear 54c shown in FIG. 7 (b). By interlocking with each other, the spacing member 50 can be positioned at a predetermined position between the boom head 21b and the hook block 24 as in the above embodiment.

In the second embodiment, when the multiplication factor of the wire ropes 22 is four, the spacing member 50 is attached to two of the four wire ropes 22. Although shown, it is not limited to this. In the case where the number of multiplications is three or more, the entanglement of the vertically extending portion 22a can be more reliably prevented by attaching the spacing member 50 between the vertically extending portions 22a. FIG. 8 shows a case where the interval holding member 50 is attached to each of the opposed vertically extending portions 22a when the multiplication number is six.

In the second embodiment, when the multiplication factor of the wire ropes 22 is four, the spacing member 50 is attached to two of the four wire ropes 22. Although shown, it is not limited to this. When the multiplying number is three or more, as shown in FIG. 9, the vertically extending portion 22 a to which the spacing member 50 is not attached is rotated to the end portion of the roller support member 55 extending from the bracket 53 of the spacing member 50. By guiding by the freely provided guide roller 55a, the wire rope 22 can be more reliably prevented from being entangled.

In the above-described embodiment, the interval holding member 50 is always positioned at the intermediate portion between the boom head 21b and the hook block 24 when the hook block 24 moves in the vertical direction. It is not limited to. For example, the spacing member may be always positioned at a third portion from the boom head 21b between the boom head 21b and the hook block 24. In this case, the moving speed of the spacing member 50 may be set by adjusting the pitch circle diameter or the rotational speed of each of the first sheave 51 and the second sheave 52.

In the above-described embodiment, the first sheave 51 and the second sheave 52 of the spacing member 50 roll without rolling or slipping with respect to the wire rope 22. Even if the two sheaves 52 are slightly displaced or slipped with respect to the wire rope 22, the above-described effects can be obtained. The spacing member 50 preferably includes means for correcting the slip and slip and returning the slip when the first sheave 51 and the second sheave 52 are displaced or slipped with respect to the wire rope 22.

DESCRIPTION OF SYMBOLS 20 ... Crane apparatus, 21b ... Boom head, 21d ... Top sheave, 22 ... Wire rope, 22a ... Vertical extension part, 23 ... Winch, 24 ... Hook block, 24c ... Hook sheave, 50 ... Space | interval holding member, 51 ... 1st sheave 52 ... 2nd sheave, 53a ... Light, 54 ... Power transmission member.

Claims

A winch, a wire rope that is wound around the winch and the tip side of which is hung from a predetermined position, a hook block that is suspended from the wire rope, and a predetermined position side and at least a hook block side of the hook block side, the predetermined position side And a sheave that changes the direction of the wire rope extending from one to the other on the hook block side so as to extend from the other to the other, and the wire rope suspended from a predetermined position is hung around the sheave, and the wire rope In a crane apparatus that moves the hook block in the vertical direction by fixing the end of the wire to the predetermined position side or the hook block side, and performing the wire rope unwinding operation and winding operation by the winch,
A distance holding member that holds the distance between the plurality of vertically extending portions that are portions extending in the vertical direction in the wire rope located between the predetermined position and the hook block;
The structure for preventing the wire rope from becoming entangled in the crane device, wherein the interval holding member moves up and down between the predetermined position and the hook block in accordance with a change in the interval between the predetermined position and the hook block.
The spacing member is
A first sheave that rolls in contact with a vertically extending portion where the wire rope moves toward one of the vertical directions when moving the hook block to one of the vertical directions;
A second sheave that rolls in contact with a vertically extending portion where the wire rope moves toward the other in the up and down direction or a vertically extending portion where the wire rope does not move when the hook block is moved in one of the up and down directions; Have
The wire rope entanglement preventing structure for a crane device according to claim 1, wherein the first sheave and the second sheave are interlocked with each other to move vertically between a predetermined position and the hook block.
The crane apparatus according to claim 2, wherein the first sheave and the second sheave have different radial dimensions, and are interlocked by being fixed to each other at a position where the respective rotation centers overlap in the axial direction. Wire rope entanglement prevention structure.
The wire rope entanglement preventing structure for a crane device according to claim 2, wherein the first sheave and the second sheave are interlocked by being connected to each other via a power transmission member.
The wire rope entanglement preventing structure for a crane device according to any one of claims 1 to 3, wherein the spacing member is located at an intermediate portion between the hook block moving in the vertical direction and a predetermined position.
The apparatus used in the case of work by a crane apparatus is attached to the space | interval holding member. The wire rope tangle prevention structure of the crane apparatus in any one of the Claims 1 thru | or 5 characterized by the above-mentioned.