JP2018065683A - Rope end connection structure of wire rope for crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent entanglement of a wire rope caused by untwisting of the wire rope.SOLUTION: In a crane 1 having a structure in which a main wire rope 27 fed from a main winch 26 is connected to a top boom member 22f of a telescopic boom 22 through a sheave 33 of a main hook block 23, a rope end part 27x of the main wire rope 27 and the top boom member 22f are connected to each other through a connecting member 40, the connecting member 40 includes a first member 41 connected to the top boom member 22f and a second member 42 connected to the rope end part 27x, and the rope end part 27x has a connection structure in which the second member 42 is rotatably connected to the first member 41.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technique of a wire rope rope end connection structure in a crane.

  Conventionally, a rope end of a winch wire rope used in a crane is connected to a top portion of a boom tip, as shown in Patent Literature 1 and Patent Literature 2.

JP 2013-144588 A Utility Model Registration No. 3202600

  Wire ropes used in cranes are manufactured by twisting steel wires, etc. When a load is applied and tension is applied to the wire rope, the wire rope itself rotates in the direction in which the twist will return (rotation). ) Occurs. And in the conventional crane, there existed a problem that a hook block will rotate with the rotational torque which originates in twisting back of a wire rope, and a wire rope will be entangled.

  The present invention has been made in view of such current problems, and in a crane, there is provided a wire rope rope end connection structure that prevents the wire rope from being entangled due to twisting back of the wire rope. It is intended to provide.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, the wire rope rope end connection structure according to the present invention is a hook block having a boom, a winch, a wire rope fed out from or into the winch, and a sheave around which the wire rope is wound. And a rope end connection structure of the wire rope in a crane having a configuration in which the wire rope fed out from the winch is connected to a top portion of the boom via a sheave of the hook block, The wire end portion of the wire rope and the top portion are connected via a connecting member, and the connecting member is connected to the top portion and a second member connected to the rope end portion. And the second member is rotatably connected to the first member.
In the rope end connection structure of the wire rope having such a configuration, the rotation torque resulting from the twisting back of the wire rope can be released by the rotation of the second member with respect to the first member. Thereby, it is possible to prevent the wire rope from being entangled due to the wire rope being twisted back.

The wire rope rope end connection structure according to the present invention is characterized in that a bearing member is interposed between the first member and the second member.
In the rope end connection structure of the wire rope having such a configuration, the second member can be smoothly rotated with respect to the first member. Thereby, it is possible to reliably prevent the wire rope from being entangled due to the wire rope being twisted back.

The wire rope rope end connection structure according to the present invention is characterized in that the first member is rotatably connected to the top portion.
In the rope end connecting structure of the wire rope having such a configuration, the connecting member can be swung in accordance with the swing of the hook block, and thereby, the swing of the hook block can be dealt with.

  As effects of the present invention, the following effects can be obtained.

  According to the rope end connection structure of the wire rope according to the present invention, it is possible to prevent the wire rope from being entangled due to the twisting back of the wire rope.

The side view which showed the whole structure of the crane. The schematic diagram which showed the rope end fastening structure of the wire rope in a crane. The schematic diagram which shows a connection member, (A) Top view, (B) Partial sectional front view. The schematic diagram which shows the rope end part of a wire rope. The fragmentary sectional front view which shows the connection condition of the rope end part of the wire rope by a connection member. The side view which shows the connection condition of the rope end part of the wire rope by a connection member.

Next, embodiments of the invention will be described.
First, the whole structure of the crane provided with the rope end connection structure of the wire rope which concerns on one Embodiment of this invention is demonstrated using FIG.
As shown in FIG. 1, the crane 1 is a mobile crane that can move to a desired location, and includes a vehicle 10 and a crane device 20.

The vehicle 10 conveys the crane device 20, has a plurality (four in this embodiment) of wheels 11, 11, 11, 11 and travels using an engine (not shown) as a power source.
Outriggers 12, 12, 12, and 12 are provided at four corners of the vehicle 10. The outrigger 12 includes a projecting beam 12a that can be extended by hydraulic pressure on both sides of the vehicle 10 in the width direction and a hydraulic jack cylinder 12b that can extend in a direction perpendicular to the ground. The vehicle 10 can bring the crane 1 into a workable state by grounding the jack cylinder 12b, and the workable range (working radius) of the crane 1 can be increased by increasing the extension length of the overhanging beam 12a. ) Can be expanded.

  The crane apparatus 20 lifts the conveyed product W with a wire rope. The swivel base 21, the telescopic boom 22, the main hook block 23, the sub hook block 24, the hoisting cylinder 25, the main winch 26, the main wire rope 27, and the sub winch. 28, a sub-wire rope 29 and a cabin 30 are provided.

  The swivel base 21 constitutes the crane device 20 so as to be turnable, and is provided on the frame of the vehicle 10 via an annular bearing. The annular bearing is disposed so that the center of rotation is perpendicular to the installation surface of the vehicle 10. The swivel base 21 is configured to be rotatable in one direction and the other direction with the center of the annular bearing as the center of rotation. The swivel base 21 is rotated by a hydraulic swivel motor (not shown).

  The telescopic boom 22 supports the wire rope so that the conveyed product W can be lifted. The telescopic boom 22 includes a base boom member 22a, a second boom member 22b, a third boom member 22c, a force boom member 22d, a fifth boom member 22e, and a top boom member 22f, which are a plurality of boom members. Each boom member is inserted in a nested manner in the order of the cross-sectional area. The telescopic boom 22 is configured to be telescopic in the axial direction by moving each boom member with an unillustrated telescopic cylinder. The telescopic boom 22 is provided on the swivel base 21 so that the base end of the base boom member 22a can swing. Thereby, the telescopic boom 22 is configured to be horizontally rotatable and swingable on the frame of the vehicle 10.

The main hook block 23 is for hooking and suspending the conveyed product W, and a plurality of hook sheaves around which the main wire rope 27 is wound and a main hook F1 for suspending the conveyed product W are provided.
In addition to the main hook block 23, the crane device 20 further includes a sub hook block 24 for hooking and suspending the conveyed product W. The sub hook block 24 is provided with a sub hook F2 for suspending the conveyed product W. It has been.

  The hoisting cylinder 25 raises and lowers the telescopic boom 22 and maintains the posture of the telescopic boom 22. The hoisting cylinder 25 is composed of a hydraulic cylinder composed of a cylinder part and a rod part.

The main winch 26 is used to feed (wind up) and feed (wind down) the main wire rope 27, and is constituted by a hydraulic winch in this embodiment.
The main winch 26 is configured such that a main drum around which a main wire rope 27 is wound is rotated by a main hydraulic motor. The main winch 26 feeds out the main wire rope 27 wound around the main drum by supplying hydraulic oil so that the main hydraulic motor rotates in one direction, and the main hydraulic motor rotates in the other direction. In this way, the main oil rope 27 is wound around the main drum and fed in by supplying the hydraulic oil.

  The sub winch 28 is used for feeding and unloading the sub wire rope 29, and in this embodiment, is constituted by a hydraulic winch.

  The cabin 30 covers the cockpit. The cabin 30 is provided on the side of the telescopic boom 22 in the swivel base 21. In the cockpit, a main operation valve for operating the main winch 26, a sub operation tool for operating the sub winch 28, a hoisting operation tool for operating the telescopic boom 22, and the vehicle 10 (crane 1). A handle for moving the vehicle is provided.

  The crane 1 configured as described above can move the crane device 20 to an arbitrary position by running the vehicle 10, and also raises the telescopic boom 22 at an arbitrary hoisting angle by the hoisting cylinder 25. Thus, the telescopic boom 22 can be extended to an arbitrary telescopic boom length.

Next, the connection structure of the rope end part of the main wire rope 27 in the crane apparatus 20 will be described with reference to FIG.
FIG. 2 is a schematic diagram of the crane apparatus 20 shown in FIG. 1, and shows a simplified configuration of each part of the crane apparatus 20.

As shown in FIG. 2, the crane device 20 includes a plurality of sheaves 31 and 32 around which a main wire rope 27 drawn out from a main winch 26 is wound on a top boom member 22 f of the telescopic boom 22.
In the crane device 20, the main wire rope 27 is guided from the main winch 26 to the top boom member 22 f along the expansion / contraction direction of the telescopic boom 22 while being guided by a plurality of sheaves (not shown), and then downward by the sheaves 31 and 32. Turn towards
Further, in the crane apparatus 20, the main wire rope 27 whose direction is changed downward by the sheaves 31 and 32 is wound around the sheave 33 of the main hook block 23 and is changed again upward, and finally the main wire rope 27 is changed. The rope end portion 27X of the wire rope 27 is coupled to the coupling portion 22g of the top boom member 22f.

  In the crane apparatus 20 having such a configuration, the transported object W is suspended from the main hook F 1, whereby tension is applied to the main wire rope 27, and the main wire rope 27 is twisted back. Rotational torque is generated.

  And in the crane apparatus 20, it is set as the structure which connects the rope end part 27X of the main wire rope 27 to the connection part 22g of the top boom member 22f via the connection member 40. As shown in FIG.

Here, the connection member 40 is demonstrated using FIG. 2 and FIG.
As shown in FIG. 2, the connecting member 40 is a member for connecting the connecting portion 22 g of the top boom member 22 f and the rope end portion 27 </ b> X of the main wire rope 27.

3A and 3B show an embodiment of the connecting member 40 in more detail.
As shown in FIGS. 3 (A) and 3 (B), the connecting member 40 is a member that can realize the rope end connecting structure of the wire rope according to the embodiment of the present invention, and includes the first member 41 and the second member 42. I have.

The first member 41 has a substantially prismatic trunnion 43 as a main portion, and shaft portions 44 and 44 are formed on the same axis at both ends in the length direction.
The connecting portion 22g on which the connecting member 40 is disposed is constituted by a pair of parallel plate-like members protruding from the top boom member 22f. The pair of connecting portions 22g and 22g are arranged on a substantially horizontal axis. A pair of hole portions 22h and 22h are formed.
The trunnion 43 is pivotally supported by the connecting portions 22g and 22g in a posture in which the shaft portions 44 and 44 are oriented substantially horizontally by inserting the shaft portions 44 and 44 into the holes 22h and 22h. Yes.

The trunnion 43 is formed with a shaft hole 45 penetrating in a direction orthogonal to the axial direction of the shaft portions 44. The shaft hole 45 is a hole through which the second member 42 is inserted.
Further, the trunnion 43 is formed with an enlarged diameter portion 46 at the upper end portion of the axial hole 45, which is a portion where the axial diameter of the axial hole 45 is increased. The enlarged diameter portion 46 is a recess for allowing a retaining member 50 described later to enter.

The second member 42 includes a substantially cylindrical shaft member 47 as a main part.
A connecting portion 48 for connecting the main wire rope 27 is formed at one end portion of the shaft member 47, and a reduced diameter portion 49 is formed at the other end portion of the shaft member 47.
The second member 42 is used with the connecting portion 48 of the shaft member 47 facing downward and the reduced diameter portion 49 facing upward.

  The connecting member 40 is inserted through the shaft member 47 from the diameter-reduced portion 49 side to a predetermined depth from the side opposite to the side where the diameter-expanded portion 46 of the shaft hole 45 of the trunnion 43 is formed. The one member 41 and the second member 42 are combined, and the shaft member 47 is rotatably supported in the shaft hole 45.

  Further, in the connecting member 40, a retaining member 50 having a size larger than that of the shaft hole 45 is formed on the reduced diameter portion 49 formed on the upper end side of the shaft member 47 by using a not-shown bolt or shrink fitting. The shaft member 47 does not fall out of the shaft hole 45 of the trunnion 43.

  Further, in the connecting member 40, a thrust bearing 51 is interposed between the trunnion 43 and the shaft member 47. In the connecting member 40, the main wire rope 27 is connected to the connecting portion 48 at the lower end of the shaft member 47, and when a substantially downward load acts on the shaft member 47, this load is borne by the thrust bearing 51, The shaft member 47 is configured to be rotatable in the shaft hole 45 even when a load is applied.

  As shown in FIG. 3B, a bolt hole 52 for inserting a bolt or the like is formed in the connecting portion 48 of the second member 42.

Here, the rope end portion 27X of the main wire rope 27 will be described with reference to FIG.
As shown in FIG. 4, a connection fitting 60 is fixed to the rope end portion 27X of the main wire rope 27 by a method such as caulking. The connection fitting 60 is formed with a bolt hole 61 for inserting a bolt or the like.

  Next, a connection structure between the top boom member 22f using the connection member 40 and the main wire rope 27 will be described with reference to FIGS.

  As shown in FIGS. 5 and 6, in the crane device 20, the top boom member 22f and the main wire rope 27 are connected by the connecting member 40 provided in the connecting portions 22g and 22g of the top boom member 22f.

More specifically, in the crane device 20, the bolt holes 52 formed in the connecting portion 48 of the connecting member 40 and the bolt holes 61 of the connecting fitting 60 fixed to the rope end portion 27 </ b> X are arranged coaxially, The bolt end 52X of the main wire rope 27 is connected to the connecting member 40 by inserting the bolt 62 through the bolt holes 52 and 61 and screwing the nut 63 into the bolt 62.
In the crane apparatus 20, the rope end portion 27X of the main wire rope 27 is connected to the top boom member 22f of the telescopic boom 22 by such a configuration. In addition, in this embodiment, although the structure which connects the rope end part 27X with respect to the connection member 40 with the volt | bolt 62 and the nut 63 was illustrated, the connection method of the rope end part 27X with respect to the connection member 40 in the crane 1 is this. Without being limited, various connection methods that can withstand the load acting on the main wire rope 27 can be employed.

  That is, the connecting structure of the rope end portion 27 </ b> X of the main wire rope 27 in the crane 1 is a structure that connects the top boom member 22 f of the telescopic boom 22 and the rope end portion 27 </ b> X of the main wire rope 27 using the connecting member 40. .

In the connecting structure of the rope end portion 27X of the main wire rope 27 using the connecting member 40, when a tension is applied to the main wire rope 27 and the main wire rope 27 is untwisted, a rotational torque is generated. The member 47 rotates.
In the connecting structure of the rope end portion 27X of the main wire rope 27 using the connecting member 40, the rotation torque is released by the rotation of the shaft member 47, and the main hook block 23 is not rotated.

  That is, the connecting structure of the rope end portion 27X of the main wire rope 27 according to the embodiment of the present invention is extended from the telescopic boom 22, the main winch 26, the main winch 26, or the main winch 26. A main hook block 23 having a wire rope 27 and a sheave 33 around which the main wire rope 27 is wound, and the main wire rope 27 fed out from the main winch 26 is telescopic boom via the sheave 33 of the main hook block 23 In the crane 1 configured to be connected to the 22 top boom member 22f, the rope end portion 27X of the main wire rope 27 and the top boom member 22f are connected via the connecting member 40, and the connecting member 40 is a first part connected to the top boom member 22f. 41, a second member 42 connected to Sakutan portion 27X, with the one in which the second member 42 is rotatably coupled to the first member 41.

  In the crane 1, the second member 42 can be rotated with respect to the first member 41 by having such a connection structure of the rope end portion 27 </ b> X with respect to the top boom member 22 f. The rotational torque caused by twisting back can be released. In the crane 1, it is possible to prevent the main hook block 23 from rotating due to the twisting back of the main wire rope 27, and thus to prevent the main wire rope 27 from being entangled.

  In the present embodiment, the shaft member 47 is rotatably supported by the trunnion 43 pivotally supported substantially horizontally. However, the mechanism that rotatably supports the second member 42 with respect to the first member 41. The configuration is not limited to the configuration shown in the present embodiment, and various configurations can be adopted.

  Further, in the connecting member 40, since the thrust bearing 51 is interposed between the first member 41 and the second member 42, the shaft member 47 always rotates smoothly, so that the main wire rope 27 tends to return to twist. When rotational torque is generated, the shaft member 47 is reliably rotated.

That is, in the connection structure of the rope end portion 27X of the main wire rope 27 according to the embodiment of the present invention, the first member 41 and the second member 42 are provided with a thrust bearing 51 as a bearing member.
With such a configuration, the second member 42 can be smoothly rotated with respect to the first member 41, thereby preventing the main hook block from being rotated due to the twisting back of the main wire rope 27, As a result, the main wire rope 27 can be reliably prevented from being entangled.

  Moreover, in the connection member 40, the trunnion 43 which comprises the 1st member 41 is rotatably supported with respect to connection part 22g * 22g of the top boom member 22f. That is, in the crane 1, the first member 41 is connected to the top boom member 22f in a rotatable state. Thereby, in the crane 1, the first member 41 swings around an axis orthogonal to the rotation axis direction of the second member 42, so that the swing of the main hook block 23 can be dealt with.

That is, in the connection structure of the rope end portion 27X of the main wire rope 27 according to the embodiment of the present invention, the first member 41 is rotatably connected to the top boom member 22f.
With such a configuration, the connecting member 40 can be swung according to the swing of the main hook block 23 to cope with the swing of the main hook block 23.

  In addition, although the crane 1 shown by this embodiment was a mobile crane, the kind of crane which applies the rope end connection structure of the wire rope which concerns on one Embodiment of this invention is not limited to this, For example, It may be a fixed crane or the like, and can be applied to various cranes having a structure in which the rope end portion of the wire rope is connected to the top portion of the boom.

1 Crane 22 Telescopic boom (boom)
22f Top boom member (top part)
23 Main hook block (hook block)
26 Main winch (winch)
27 Main wire rope (wire rope)
27X rope end 33 sheave 40 connecting member 41 first member 42 second member 51 thrust bearing (bearing member)

Claims (3)

The boom,
Winch,
A wire rope drawn out from the winch or drawn into the winch;
A hook block having a sheave around which the wire rope is wound;
With
In the crane of the configuration in which the wire rope fed out from the winch is connected to the top portion of the boom via a sheave of the hook block,
The rope end portion and the top portion of the wire rope,
It is connected via a connecting member,
The connecting member is
A first member coupled to the top portion;
A second member connected to the rope end,
With
The second member is rotatably connected to the first member;
A rope end connection structure of a wire rope characterized by the above. A bearing member is interposed between the first member and the second member.
The rope end connection structure of the wire rope according to claim 1. The first member is
It is rotatably connected to the top part,
The rope end connection structure of the wire rope according to claim 1 or 2, characterized by the above-mentioned.

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