Sheave device and wire rope installation method

Abstract

The object of this disclosure is to provide a sheave device that allows wire ropes having a member at their 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 stretched; 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 from which the shaft portion can move between a first position in which the sheave rotates during the operation of the construction machine and a second position that is further away from the first position relative to the connecting portion.

Description

Technical Field

[0001] The present disclosure relates to a method for installing a wire rope of a sheave device.

Background Art

[0002] In construction machines such as cranes, a wire rope for raising and lowering a hook for a suspended load is used. As a member for guiding the wire rope at the tip of a boom or the like, a sheave device including a rotatable sheave may be attached. The wire rope may be replaced depending on the type of work performed by the construction machine. There are known hoisting tools such as cranes that can easily replace a wire rope having a thimble or the like processed at the tip or a tool socket or the like attached thereto (published in Japanese Utility Model Publication No. 59-133580).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The hoisting tool described in the above publication has a sheave and a sheave guard that is attached to the side plate of the hoisting tool on both diagonally lower sides of the sheave and has an arc shape. The upper end of the sheave guard is attached so as to rotate outward by removing a stay bolt, and the lower end is attached so as to be a pivot of the rotating sheave guard. When arranging the wire rope on the sheave, it is said that by rotating the upper end of the sheave guard outward, the wire rope having a member at the tip or the tip being processed can be easily arranged. If the sheave guide is provided in the hoisting tool or the sheave device or the like, the configuration may become complicated and the cost may increase. It is required to be able to easily arrange the wire rope on the sheave with a simpler configuration.

[0005] This disclosure has been made in view of the circumstances described above, and aims 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. [Means for solving the problem]

[0006] A sheave device according to one aspect of the present disclosure for solving the above problems 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 stretched; 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 away from the first position relative to the connecting portion. [Effects of the Invention]

[0007] A sheave device according to one aspect of this disclosure allows for easy installation of a wire rope having a member at its tip or having a processed tip onto the sheave. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic side view showing a construction machine in which the sheave device of this disclosure is installed. [Figure 2] Figure 2 is a schematic enlarged side view showing the sheave device of the construction machine shown in Figure 1. [Figure 3] Figure 3 is a schematic side view showing the sheave device of the present disclosure in a moved state. [Figure 4] 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] 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. [Modes for carrying out the invention]

[0009] [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.

[0010] 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 providing a sufficient gap between the sheave and the connection point. For this reason, a wire rope having a member at its tip or having a processed tip (hereinafter, such a wire rope is also referred to as a "processed-tip wire rope") can be easily installed on the sheave.

[0011] (2) In the above (1), the sheave device may further include a fixing member that fixes the shaft portion in the hole to the first position. By including the fixing member in the sheave device, the stability of the sheave rotating in the first position can be improved.

[0012] (3) In (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 can be easily moved between the first position and the second position.

[0013] (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.

[0014] (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 having a processed tip on a sheave of a sheave device which is arranged 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 which rotatably holds the sheave, a pair of brackets which have holes formed in which the shaft portion is arranged, and a connecting portion which 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 step of increasing the distance, installing the wire rope on the sheave.

[0015] This wire rope installation method increases the distance between the shaft holding the sheave and the connecting part that connects the pair of brackets, thereby creating a sufficient gap between the sheave and the connecting part. Therefore, the wire rope with the processed tip can be easily installed on the sheave.

[0016] (6) In the above (5), the increased spacing may be maintained during the increasing process. Maintaining the increased spacing makes it easier to install the wire rope with the processed tip.

[0017] (7) Paragraph (5) or (6) above may further include, after the erection step, a step of reducing the distance between the shaft and the connection, and after the reduction step, a step of fixing the shaft so that it cannot be moved. Reducing the distance allows the sheave to be returned to the position where it can be rotated by the work of the construction machine. Fixing the shaft so that it cannot be moved improves the stability of the sheave's rotation during the work.

[0018] Note that "front" means the direction toward the tip in the axial direction of the undulating member (such as a boom or a jib), and "rear" means the direction toward the base end in the above axial direction. Also, in a plan view, the direction orthogonal to the front-rear direction is "left-right", and the direction in which the undulating member undulates (pitches) is "up-down". "Parallel" includes not only a perfect parallel but also a substantially parallel state within approximately 20 degrees.

[0019] [Details of the form for implementing the present disclosure] Hereinafter, a construction machine according to an embodiment of the present disclosure will be described with reference to the drawings. Note that each drawing is for explanatory purposes, and the shape, scale, etc. of each component (each member) may be different from the actual ones.

[0020] <Sheave device> The sheave device is arranged at the tip of the undulating member of the construction machine. As shown in FIG. 1, the construction machine of the present embodiment mainly includes a lower traveling body 2, an upper revolving body 3 that is rotatably mounted on the lower traveling body 2, and an undulating member (boom 4) attached to the upper revolving body 3. The sheave device 10 is arranged at the tip of the boom 4, and it is a crane 1. The boom 4 is formed in a substantially square tubular shape and has a lattice structure framework. The construction machine is not limited to the crane 1, and it may be a wheel crane (such as a rough terrain crane) equipped with tires, a stationary crane without a traveling body (such as a climbing crane), a gantry crane used in a port, etc.

[0021] The lower traveling body 2 has a pair of crawlers 21 as a traveling device, etc., and enables the crane 1 to travel in an arbitrary direction. The upper revolving body 4 is rotatably mounted on the lower traveling body 5 and has a cab for an operator, a boom winch (not shown) for raising and lowering the boom 4 in the vertical direction, a rope winch (not shown) for paying out and hoisting a wire rope 5 suspended from the tip of the boom 4, etc.

[0022] As shown in Figure 2, the sheave device 10 includes a sheave 11 on which the wire rope 5 unwound from the rope winch is mounted, a shaft 12 that rotatably holds the sheave 11, a pair of brackets 13 in which holes 131 are formed where the shaft 12 is positioned, and a connecting part 14 that connects the pair of brackets 13. The sheave device 10 of this embodiment further includes an auxiliary sheave 15 behind the pair of brackets 13.

[0023] The connecting portion 14 is a plate-shaped member and is fixed forward to maintain the distance between the pair of brackets 13. The connecting portion 14 also prevents the wire rope 5, which has come off the sheave 11, from detaching forward of the sheave device 10. The connecting portion 14 may be formed integrally with the pair of brackets 13, or it may be fixed to the pair of brackets 13 by known means such as bolts or welding. The connecting portion 14 is not limited to a plate shape, but may also be a columnar or other type of member.

[0024] A pair of brackets 13 have holes 131 formed in them for positioning the shaft portion 12. The holes 131 are formed as elongated holes that allow the shaft portion 12 to move between a first position where the sheave 11 rotates during operation of the crane 1 and a second position where it moves away from the first position relative to the connecting portion 14. The second position is the position where the wire rope 5 is replaced with the processed wire rope when the crane 1 is stopped, or the position where the processed wire rope is positioned or removed when assembling or disassembling the boom 4.

[0025] The hole 131 should have its major axis in a direction parallel to the axial direction of the boom 4. That is, the hole 131 should be formed to be an elongated hole in the front-rear direction. By making the hole 131 an elongated hole in the front-rear direction and moving the shaft portion 12 to the second position, the sheave 11 can be easily moved away from the connecting portion 14 located in front of the pair of brackets 13, and a sufficient gap can be provided between the sheave 11 and the connecting portion 14. With the gap provided between the sheave 11 and the connecting portion 14, the processed wire rope can be easily inserted into the gap and easily erected on the sheave 11.

[0026] The sheave device 10 may include a fixing member 16 that fixes the shaft portion 12 in the hole 131 to the first position. Specifically, the fixing member 16 is a plate-shaped member arranged on the outer surface of a pair of brackets 13, and has a bottomed hole or through hole in its center for holding the end of the shaft portion 12. The fixing member 16 is detachably arranged on the outer surface by known means such as bolts. The fixing member 16 fixes the shaft portion 12 immovably in the hole 131 at the first position, allowing the sheave 11 to rotate stably.

[0027] The sheave device 10 may further include a spacer or bearing (not shown) between the sheave 11 and the bracket 13. By providing the spacer or bearing, the gap between the sheave 11 and the bracket 13 in the left-right direction can be filled, so that the shaft portion 12 can be moved easily. Specifically, one end of the shaft portion 12 may move relative to the hole 131 of the pair of brackets 13, while the other end does not move. If the spacer or bearing is not provided and there is a gap between the sheave 11 and the bracket 13, only one end or the other end may move, causing the sheave 11 to be non-parallel to the axial direction (front-rear direction) of the boom 14 in a plan view, and a sufficient gap may not be formed between the sheave 11 and the connecting portion 14. By providing the above-mentioned spacer or bearing, the gap between the sheave 11 and the bracket 13 is eliminated, making it easier to move the shaft portion 12 so that the sheave 11 maintains parallelism in the front-rear direction. This improves the certainty of creating a gap between the sheave 11 and the connecting portion 14, and thus improves the ease of installing the processed wire rope.

[0028] <Method for installing wire ropes> The method for installing the wire rope (hereinafter also simply referred to as "the installation method") is a method for installing a wire rope having a member at its tip or having a processed tip on the sheave 11 of a sheave device 10, which is positioned at the tip of the luffing member (boom 4) of a construction machine (crane 1) and on which a wire rope (wire rope 5 and a wire rope with a processed tip) unwound from a winch is installed; a shaft portion 12 that rotatably holds the sheave 11; a pair of brackets 13 having holes 131 in which the shaft portion 12 is positioned; and a connecting portion 14 that connects the pair of brackets 13, 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.

[0029] The erection method may further include a step of removing the fixing member 16 from the bracket 13 before the moving step. The erection method may further include a step of reducing the distance between the shaft and the connecting part after the erection step, and a step of fixing the shaft so that it cannot be moved after the reduction step.

[0030] [Removal process] When replacing the wire rope 5 of the assembled boom 4, the fixing member 16 that secures the shaft portion 12 in the first position is removed from the bracket 13. In other words, the shaft portion is made movable. The fixing member 16 is best removed when the boom 4 is tilted to a nearly horizontal position (horizontal position) (see Figure 2). By removing the fixing member 16 from the bracket 13, the shaft portion 12 can be moved within the hole 131.

[0031] [Increasing number of processes] In the increasing step, the distance between the shaft portion 12 and the connecting portion 14 is increased. Specifically, the shaft portion 12 is moved from the first position to the second position to increase the distance between the sheave 11 and the connecting portion 14. The movement of the shaft portion 12 may be performed while lubricating at least one of the shaft portion 12 and the hole 131, or after lubrication. The method of moving the shaft portion 12 is not particularly limited, and for example, the following four methods can be cited.

[0032] (First method of movement) After removing the fixing member 16, raise the boom 4 diagonally upward (for example, at an angle of 45 degrees with the approximate horizontal) (see Figure 1). The shaft portion 12 moves to the second position due to its own weight and the weight of the sheave 11, etc., within the elongated hole (hole 131) formed parallel to the axial direction of the boom 4. After the shaft portion 12 has moved to the second position, the boom 4 may be returned to the horizontal position.

[0033] In the process of increasing the distance as described above, it is preferable to maintain the increased distance. Specifically, it is preferable to fix the shaft portion 12 that has been moved to the second position so that it cannot be moved. In other words, it is preferable to prevent the shaft portion 12 that has been moved to the second position from unintentionally moving back to the first position. In the first method of movement described above, after the shaft portion 12 has moved to the second position, it is preferable to return the boom 4 to a position where it is slightly diagonally upward (for example, an angle of 10 degrees with the horizontal). By positioning the boom 4 slightly diagonally upward, the shaft portion 12 is fixed to the second position by its own weight and the weight of the sheave 11, etc., and it is possible to prevent it from unintentionally returning to the first position.

[0034] (Second method of transportation) After removing the fixing member 16, as shown in Figure 3, the horizontal position of the boom 4 is maintained, and a rod-shaped moving jig 20 is inserted between the shaft portion 12 and the connecting portion 14, and the shaft portion 12 is moved to the second position using the principle of leverage. The moving jig 20 preferably has a first portion 21 that is inserted between the shaft portion 12 and the connecting portion 14, and a second portion 22 that extends from the end of the first portion 21 in a direction perpendicular to the axial direction. That is, the moving jig 20 preferably has a roughly L-shape when viewed from the side. Forming the moving jig 20 into a roughly L-shape improves operability by the operator.

[0035] As a method for maintaining the increased distance in the second movement method described above, the moving jig 20, which has the shaft portion 12 moved, can be fixed to the bracket 13 in an immobile manner. For example, holes for inserting a fixing pin (not shown) can be provided in the second portion 22 of the moving jig 20 and in the bracket 13. After moving the shaft portion 12 to the second position using the moving jig 20, the moving jig 20 can be fixed by inserting the fixing pin through the holes in the second portion 22 and the bracket 13, thereby fixing the shaft portion 12 to the second position.

[0036] (Third method of transportation) After removing the fixing member 16, as shown in Figure 4, the boom 4 is moved to the second position using an extension device 30 such as a jack or hydraulic cylinder while maintaining the horizontal position of the boom 4. The extension device 30 is preferably configured so that one end is fixed to the bracket 13. By maintaining the length of the extension device 30 with the shaft 12 moved to the second position, the shaft 12 can be fixed to the second position, and the increased distance can be maintained.

[0037] (Fourth method of travel) After removing the fixing member 16, as shown in Figure 5, the horizontal position of the boom 4 is maintained, and the lower connecting member 30 of the multiple (two in Figure 5) connecting members (bolts, pins, etc.) 30 that connect the boom 4 and the sheave device 10 is removed. Next, the luffing rope 6 (see Figure 1) for luffing the boom 4 is wound up, and the sheave device 10 is rotated around the upper connecting member 30 so that it faces diagonally upward relative to the boom 4. As the sheave device 10 faces diagonally upward, the shaft portion 12 moves to the second position due to its own weight and the weight of the sheave 11, etc. By maintaining the position in which the sheave device 10 faces diagonally upward, the shaft portion 12 can be fixed to the second position, and the increased distance can be maintained.

[0038] [Construction process] After the above-mentioned increasing step, the processed wire rope is installed on the sheave. In the installation step, the shaft portion 12 is moved to the second position to increase the distance between the sheave 11 and the connection portion 14, so that the processed wire rope can be easily positioned.

[0039] [Processes to be reduced] After the erection process described above, the distance between the shaft portion 12 and the connecting portion 14 is reduced. That is, the shaft portion 12 is moved from the second position to the first position. Specifically, for example, by slightly tilting the boom 4 downward, the shaft portion 12 moves to the first position due to its own weight and the weight of the sheave 11, etc.

[0040] [The fixing process] After the reduction process described above, the shaft portion 12 is fixed so that it cannot be moved. That is, the shaft portion 12 is fixed to the first position. Specifically, after moving the shaft portion 12 to the first position, the fixing member 16 is attached to the outer surface of the pair of brackets 13 to hold both ends of the shaft portion 12.

[0041] The sheave device 10 and the installation method allow the sheave 11 to be positioned far away from the connection part 14, providing sufficient space, thus enabling easy installation of the wire rope with a processed tip.

[0042] [Other embodiments] The above embodiments do not limit the configuration of the present invention. Accordingly, the above embodiments allow for the omission, substitution, or addition of components of each part of the above embodiments based on the description herein and common technical knowledge, and all such omissions should be interpreted as falling within the scope of the present invention.

[0043] In the above embodiment, a configuration in which the connecting portion is located in front of the bracket has been described, but the invention is not limited to this, and for example, the connecting portion may be located above the bracket. In this case, the hole formed in the bracket may be an elongated hole along a virtual line passing through the center of the connecting portion and the center of the diameter of the shaft portion.

[0044] In the process of increasing and decreasing the distance between the sheave and the connection part in the erection method, the distance between the sheave and the connection part was increased and decreased by moving the shaft that rotatably holds the sheave. However, the connection part may be configured to be movable, and the distance may be increased and decreased by moving this connection part. [Industrial applicability]

[0045] The sheave device of the present invention allows for easy placement of wire ropes with processed ends, making it suitable for use in construction machinery and the like. [Explanation of symbols]

[0046] 1. Crane (construction machinery) 2 Lower running body 21 Crawler 3. Upper rotating body 4. Boom (relieving member) 5 Wire rope 6. Relief rope 10. Sheave device 11 Sheaves 12 Shaft section 13 brackets 131 holes 14 Connection part 15 Auxiliary sheave 16 Fixing member 20. Moving fixtures 21 Part 1 22 Part 2 30 Telescopic device

Claims

1. 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, The connection part that connects the pair of brackets mentioned above and Equipped with, 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.

2. The sheave device according to claim 1, further comprising a fixing member for fixing the shaft portion in the first position through the hole described above.

3. The sheave device according to claim 1, further comprising a spacer or bearing between the sheave and the bracket.

4. 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.

5. 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, After the above increasing process, the process of installing the wire rope on the sheave is followed. A method for installing wire ropes, which includes [a specific feature / feature].

6. The erection method according to claim 5, wherein the increased distance is maintained during the process of increasing the distance as described above.

7. After the above erection process, the process of reducing the distance between the shaft and the connection part is performed. After the above reduction step, there is a step of fixing the shaft portion so that it cannot be moved. The erection method according to claim 5 or claim 6, further comprising:

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