JP-2026074711-A - Sheave device and wire rope installation method

JP2026074711AJP 2026074711 AJP2026074711 AJP 2026074711AJP-2026074711-A

Abstract

[Problem] The object of this disclosure is to provide a sheave device that allows a wire rope having a member at its tip or having a processed tip to be easily installed on a sheave. [Solution] A sheave device according to one aspect of the present disclosure is a sheave device arranged at the tip of a luffing member of a construction machine, comprising: a sheave on which a wire rope unwound from a winch is mounted; a shaft portion that rotatably holds the sheave; a pair of brackets having holes in which the shaft portion is arranged; and a connecting portion that connects the pair of brackets, wherein the hole is formed as an elongated hole on which the shaft portion can move between a first position in which the sheave rotates during operation of the construction machine and a second position that is further away from the first position relative to the connecting portion. [Selection Diagram] Figure 2

Inventors

木村勇揮
正井啓記
安和薫広
長澤昌也
萩原貴裕
米田有介

Assignees

コベルコ建機株式会社

Dates

Publication Date: 20260507
Application Date: 20241021

Claims (7)

A sheave device positioned at the tip of a luffing member of a construction machine, The wire rope unfurled from the winch is installed on the sheave, The shaft portion that rotatably holds the above sheave, A pair of brackets having holes in which the above-mentioned shaft portion is arranged, It comprises a connecting part that connects the pair of brackets mentioned above, A sheave device in which the hole is formed as an elongated hole that allows the shaft portion to move between a first position in which the sheave rotates during the operation of the construction machinery and a second position that is away from the first position relative to the connecting portion.
The sheave device according to claim 1, further comprising a fixing member for fixing the shaft portion to the first position through the hole described above.
The sheave device according to claim 1, further comprising a spacer or bearing between the sheave and the bracket.
The sheave device according to any one of claims 1 to 3, wherein the hole has a major axis in a direction parallel to the axial direction of the undulating member.
A method for installing a wire rope having a member at its tip or a processed tip on a sheave, comprising a sheave positioned at the tip of a luffing member of a construction machine on which a wire rope unfurled from a winch is stretched; a shaft portion that rotatably holds the sheave; a pair of brackets having holes in which the shaft portion is positioned; and a connecting portion that connects the pair of brackets, the sheave device comprising: A step of increasing the distance between the shaft portion and the connecting portion, A method for installing a wire rope, comprising the steps of installing the wire rope onto the sheave after the above-mentioned increasing step.
The erection method according to claim 5, wherein the increased spacing is maintained during the process described above.
After the above erection process, the process of reducing the distance between the shaft and the connection part is performed. The erection method according to claim 5 or claim 6, further comprising the step of fixing the shaft portion so that it cannot be moved after the above reduction step.

Description

This disclosure relates to a method for installing a sheave device wire rope. In construction machinery such as cranes, wire ropes are used to raise and lower the hooks for lifting loads. A sheave device, including a rotatable sheave, is sometimes attached to the tip of the boom or other structure to guide this wire rope. The wire rope may be replaced depending on the type of work performed by the construction machinery. Lifting devices for cranes and other equipment that allow for easy replacement of wire ropes with thimbles or other attachments at the end, or with tool sockets, are known (Japanese Utility Model Publication No. 59-133580). Public Relations Notice No. 59-133580 Figure 1 is a schematic side view showing a construction machine in which the sheave device of this disclosure is installed.Figure 2 is a schematic enlarged side view showing the sheave device of the construction machine shown in Figure 1.Figure 3 is a schematic side view showing the sheave device of the present disclosure in a moved state.Figure 4 is a schematic side view showing the state in which the shaft portion has been moved by a different means than that shown in Figure 3.Figure 5 is a schematic side view showing the state in which the shaft portion is moved by a different means than that shown in Figures 3 and 4. [Description of Embodiments of this Disclosure] (1) A sheave device according to one aspect of the present disclosure is a sheave device disposed at the tip of a luffing member of a construction machine, comprising: a sheave on which a wire rope unwound from a winch is mounted; a shaft portion that rotatably holds the sheave; a pair of brackets having holes in which the shaft portion is disposed; and a connecting portion that connects the pair of brackets, wherein the hole is formed as an elongated hole on which the shaft portion can move between a first position in which the sheave rotates during operation of the construction machine and a second position that is away from the first position relative to the connecting portion. The sheave device is configured such that the shaft holding the sheave moves to a position away from the connection point connecting the pair of brackets, thereby allowing for a sufficient gap between the sheave and the connection point. Therefore, wire ropes with a member at the end or with a processed end (hereinafter, such wire ropes are also referred to as "processed-end wire ropes") can be easily installed on the sheave. (2) In the above (1), the sheave device may further include a fixing member that secures the shaft portion to the first position through the hole. By including the fixing member in the sheave device, the stability of the sheave's rotation at the first position can be improved. (3) In the case of (1) or (2) above, the sheave device may further include a spacer or bearing between the sheave and the bracket. By including the spacer or bracket in the sheave device, the shaft portion can be easily moved between the first position and the second position. (4) The hole may have a major axis in a direction parallel to the axial direction of the rib member. By forming the hole as an elongated hole with a major axis in a direction parallel to the axial direction of the rib member, the sheave can be easily moved away from the connection part located in front, and the wire rope can be easily positioned. (5) A wire rope installation method according to one aspect of the present disclosure is a method for installing a wire rope having a member at its tip or a processed tip on a sheave of a sheave device, which comprises a sheave positioned at the tip of a luffing member of a construction machine and on which a wire rope unwound from a winch is installed; a shaft portion that rotatably holds the sheave; a pair of brackets having holes in which the shaft portion is positioned; and a connecting portion that connects the pair of brackets, the method comprising the steps of increasing the distance between the shaft portion and the connecting portion, and, after the increasing step, installing the wire rope on the sheave. This wire rope installation method increases the distance between the shaft holding the sheave and the connecting part connecting the pair of brackets, thereby allowing for a sufficient gap between the sheave and the connecting part. Therefore, the wire rope with the processed end can be easily installed on the sheave. (6) In the process described in (5) above, the increased spacing may be maintained. Maintaining the increased spacing improves the ease of installing the wire rope with the processed tip. (7) In (5) or (6) above, the procedure may further include a step of reducing the distance between the shaft and the connection after the erection step, and a step of fixing the shaft so that it cannot be moved after the reduction step. By reducing the distance, the sheave can be returned to the position where it rotates due to the work of the construction machine. By fixin