Wire replacement assist device and wire replacement method

Abstract

To provide a wire replacement assist device and wire replacement method that can prevent tangled winding during the wire replacement process when replacing a crane wire. [Solution] The wire replacement assist device 1 of the present invention is a wire replacement assist device that assists in the replacement work of replacing the wire 5 wound on the drum 4 of a hoisting device 3 installed on a crane 2, and comprises a gripping part 10 that grips the wire 5 on the side that is wound up on the drum 4 and rises during the wire 5 discard winding work of the replacement work, and a load part 20 that applies a load to the gripping part 10 to prevent the wire 5, which is gripped by the gripping part 10, from rising toward the drum, and when the drum 4 winds up the wire 5 during the wire 5 discard winding work, the load from the load part 20 acts on the wire 5 via the gripping part 10, and tension is applied to the wire 5 between the drum 4 and the gripping part 10.

Description

Technical Field

[0001] The present invention relates to a wire replacement assisting device and a wire replacement method.

Background Art

[0002] Patent Document 1 discloses a method for replacing a wire in a crane, which enables manual wire pulling work by temporarily replacing it with a lightweight resin guide rope. In the method described in Patent Document 1, the end of the old wire to be replaced is removed from the drum, the end of the old wire and the end of the resin guide rope are connected by a swivel shackle, and the old wire is pulled so that the connection part moves in the payout direction via a pulley. Then, the end of the old wire is removed from the swivel shackle, the end of the new wire is connected to the swivel shackle, and the resin guide rope is pulled so that the connection part moves in the winding direction via a pulley. After that, the end of the new wire is removed from the swivel shackle, and the end of the new wire is attached to the fixing member of the drum.

[0003] Patent Document 2 discloses a method for replacing a wire in a crane provided with a drum mounted on a carriage traveling on a rail.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] When replacing a crane's wire rope, it is desirable to prevent tangled winding during the initial wire winding process. To prevent tangled winding, the wire needs to be under a certain level of tension to prevent it from coming off the drum groove. In most cranes, the wire's own weight provides sufficient tension, guiding it naturally into the drum groove. However, for shorter wires, the tension from their own weight alone is insufficient, and they are not properly guided into the drum groove. Therefore, it is necessary to apply tension to the wire in some way to guide it into the drum groove.

[0006] Although the methods described in Patent Documents 1 and 2 involve winding a new replacement wire onto a drum using a winding device, there is room for improvement because if the wire's own weight is insufficient to generate tension, it is not possible to apply a certain level of tension to the wire. To prevent tangled winding, it is conceivable that an operator could hold the wire by hand and apply tension manually, but this method carries the risk of pinching the hand holding the wire with the snatch block during winding.

[0007] The present invention has been made to solve the above problems, and aims to provide a wire replacement assist device and wire replacement method that can prevent irregular winding from occurring during the wire discarding process when replacing a crane wire. [Means for solving the problem]

[0008] The wire replacement assist device according to the present invention is a wire replacement assist device for assisting in the replacement work of replacing a wire wound on a drum of a hoisting device installed on a crane, and comprises a gripping part that grips the wire that is wound up on the drum and rising during the wire discarding work of the replacement work, and a load part that applies a load to the gripping part to the wire that is held by the gripping part and rises toward the drum, wherein when the drum winds up the wire during the wire discarding work, the load from the load part acts on the wire via the gripping part, and tension is applied to the wire between the drum and the gripping part.

[0009] The wire replacement assist device according to the present invention is characterized in that the load portion comprises a main body placed on the ground, a fixing member provided on the main body, and a connecting member connected to the fixing member and connecting the fixing member and the gripping portion, and the gripping portion is supported on one end side of the connecting member.

[0010] The wire replacement assist device according to the present invention is characterized in that the gripping portion comprises a split pipe member arranged to cover the wire and extending along the wire, a claw member arranged to sandwich the wire between itself and the split pipe member and capable of pressing the wire against the split pipe member, and an axial support member attached to the split pipe member and supporting the claw member, wherein the claw member is pivotable with the support member as its pivot axis.

[0011] The wire replacement assist device according to the present invention is characterized in that, in the above invention, the claw member is pivotable between a clamping position in which the wire is clamped between the half-split pipe member and an open position in which the wire is released from the half-split pipe member, and when the claw member is in the clamping position, the wire is clamped between the half-split pipe member and the claw member, and the gripping portion grips the wire.

[0012] The wire replacement assist device according to the present invention is characterized in that the connecting member is a rod-shaped member that can swing between the vertical and horizontal directions with the fixing member as a fulcrum, and the gripping portion is prevented from moving in the winding direction of the wire beyond the length of the connecting member.

[0013] The wire replacement assist device according to the present invention is characterized in that the support member is composed of a fastening member that fixes the claw member to the split pipe member when the claw member is in the clamping position.

[0014] The wire replacement method according to the present invention is characterized by replacing the wire using the wire replacement assist device described in the above invention. [Effects of the Invention]

[0015] According to the present invention, when replacing a crane wire, tension can be applied to guide the wire onto the drum without the worker directly touching the wire during the wire winding process. This avoids risks such as pinching of fingers during crane wire replacement work and also reduces the need for equipment maintenance personnel to be present during wire replacement work. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 is a schematic diagram showing a wire replacement assist device in an embodiment. [Figure 2] Figure 2 is a diagram illustrating the state of tension applied to the wire during the sacrificial winding process. [Figure 3] Figure 3 is a diagram illustrating the gripping portion. [Figure 4] Figure 4 is an exploded view illustrating the structure of the gripping section. [Figure 5] Figure 5 is a diagram illustrating how to attach the gripping part to the wire. [Figure 6]FIG. 6 is a diagram for explaining the attachment of the claw member to the half pipe member. [Figure 7] FIG. 7 is a diagram for explaining the attachment of the claw member to the half pipe member by the support member. [Figure 8] FIG. 8 is a diagram for explaining the state where the claw member is attached to the half pipe member. [Figure 9] FIG. 9 is a diagram for explaining the state where the snatch block is placed on the ground. [Figure 10] FIG. 10 is a diagram for explaining the lowering of the snatch block to the ground side. [Figure 11] FIG. 11 is a diagram for explaining the state where the snatch block is placed on the ground. [Figure 12] FIG. 12 is a diagram for explaining that the wire is under tension in the state where the gripping portion grips the wire. [Figure 13] FIG. 13(a) is a diagram for explaining the state where the wire is correctly guided in the drum groove, and FIG. 13(b) is a diagram for explaining the state where the wire is displaced from the drum groove. [Figure 14] FIG. 14 is a diagram for explaining the state where the snatch block rises from the ground. [Figure 15] FIG. 15 is a diagram schematically showing a modified example of the claw member. [Figure 16] FIG. 16 is a diagram for explaining the state where the claw member in the modified example presses the wire.

Embodiments for Carrying out the Invention

[0017] Hereinafter, with reference to the drawings, the wire exchange assisting device and the wire exchange method in the embodiments of the present invention will be specifically described. Note that the constituent elements in the embodiments shown below include those that can be replaced by those skilled in the art and are easy to replace, or those that are substantially the same.

[0018] Figure 1 is a schematic diagram showing a wire replacement assist device in an embodiment. The wire replacement assist device (hereinafter referred to as the assist device) 1 is a device that assists in the wire replacement work when replacing the wire 5 wound on the drum 4 of the hoisting device 3 installed on the crane 2. The hoisting device 3 can wind up the wire 5 by rotating the drum 4. The drum 4 has a fixed part 4a to which one end of the wire 5 is attached, and a fixed part 4b to which the other end of the wire 5 is attached. The side with the fixed part 4a is the fixed side, and the side with the fixed part 4b is the movable side. The drum 4 has a drum groove 4c around which the wire 5 is wound. The drum groove 4c is also called the winding groove. The hoisting device 3 is equipped with a power source to rotate the drum 4. By rotating the drum 4 of the hoisting device 3, the snatch block 6 suspended from the wire 5 can be raised and lowered. The wire 5 is the wire wound up by the hoisting device 3. The wire 5 is called a crane wire or wire rope. The snatch block 6 has a sheave around which the wire 5 is wound.

[0019] As shown in Figures 1 and 2, the auxiliary device 1 is used when replacing the wire 5, while the snatch block 6 is resting on the ground 7 and the wire 5 is being unwound. For example, the unwinding operation is performed with both ends of the new wire 5 attached to the fixing parts 4a and 4b. The auxiliary device 1 grips the movable side of the wire 5 hanging towards the ground 7 and applies tension to the wire 5 between the drum 4 and the snatch block 6.

[0020] The auxiliary device 1 comprises a gripping part 10 and a load part 20. The gripping part 10 grips the wire 5 that is being wound up onto the drum 4 and rising during the discard winding operation of the wire 5 replacement work. The load part 20 applies a load to the gripping part 10 to counteract the upward movement of the wire 5, which is being held by the gripping part 10, toward the drum 4. When the drum 4 winds up the new wire 5 during the discard winding operation of the wire 5 during the replacement work, the load from the load part 20 acts on the wire 5 via the gripping part 10, applying tension to the wire 5 between the drum 4 and the gripping part 10.

[0021] As shown in Figures 3 and 4, the gripping portion 10 has a split pipe member 11, a claw member 12, and a pin 13. The gripping portion 10 grips the wire 5 by sandwiching it between the split pipe member 11 and the claw member 12.

[0022] The split pipe member 11 is formed in the shape of a straight pipe that has been cut in half. As shown in Figures 5 and 6, the split pipe member 11 is arranged to cover the wire 5. The split pipe member 11 has a pair of support portions 11a to which the pin 13 is attached. Each support portion 11a is provided with a through hole 11b through which the pin 13 is inserted.

[0023] The claw member 12 is a member capable of pressing the wire 5 against the split pipe member 11. The claw member 12 has a structure that rotates around the pin 13 as a pivot point, and is rotatable relative to the split pipe member 11. As shown in Figure 4, the claw member 12 has a through hole 12a through which the pin 13 is inserted. As shown in Figures 3, 7, and 8, the claw member 12 is pivotable around the pin 13 inserted through the through hole 12a as the pivot axis. The claw member 12 is pivotable between a clamping position in which the wire 5 is sandwiched between the split pipe member 11 and the claw member 12, and an open position in which the wire 5 is released from the split pipe member 11. When the claw member 12 is in the clamping position, the wire 5 is sandwiched between the split pipe member 11 and the claw member 12, and the gripping portion 10 grips the wire 5.

[0024] Figure 8 shows the state where the claw member 12 is not swinging, while Figure 3 shows the state where the claw member 12 is swinging. In the state shown in Figure 8, the claw member 12 is not pressing the wire 5 against the split pipe member 11 (open state). In the state shown in Figure 3, the claw member 12 is pressing the wire 5 against the split pipe member 11 (clamping state). The rotation angle of the claw member 12 can be adjusted by the angle of the connecting member 23 of the load section 20 relative to the split pipe member 11. By changing the rotation angle of the claw member 12 to an angle from the vertical to the horizontal, i.e., within a range of 0° or more and less than 90°, the strength with which the claw member 12 clamps the wire 5 can be adjusted. This makes it possible to apply the appropriate tension to the wire 5 from the auxiliary device 1 when replacing the wire 5.

[0025] The pin 13 is a member that supports the claw member 12 to the split pipe member 11. The pin 13 is made of a wing bolt. The pin 13 is inserted through both through holes 11b of the split pipe member 11 and screwed onto the nut 14. A washer 15 is interposed between the nut 14 and the support part 11a. When the pin 13 is made of a wing bolt, the worker can turn the wing bolt. The pin 13 and the nut 14 are fastening members that fix the claw member 12 to the split pipe member 11. The pin 13 is made of a support member that supports the claw member 12 and a fastening member that fixes the claw member 12 to the split pipe member 11 when the claw member 12 is in a clamping position.

[0026] For example, the claw member 12 can be fixed to the split pipe member 11 by a pin 13 and a nut 14 such that the claw member 12 is fixed at a predetermined angle of oscillation relative to the split pipe member 11. Alternatively, the claw member 12 can be attached to the split pipe member 11 by a pin 13 and a nut 14 such that the claw member 12 can swing relative to the split pipe member 11 in response to the load acting on the gripping part 10 from the wire 5. In this case, the oscillation angle of the claw member 12 relative to the split pipe member 11 can be changed by the connecting member 23 of the load part 20.

[0027] In the gripping section 10, the wire 5 is sandwiched between the split pipe member 11 and the claw member 12, so that the gripping section 10 does not slip due to oil or other substances on the wire 5, and tension can be applied to the movable wire 5.

[0028] As shown in Figures 1 and 2, the load unit 20 includes a main body 21, a fixing member 22, and a connecting member 23.

[0029] The main body 21 is placed on the ground 7. The main body 21 functions as a weight to generate tension in the wire 5. For example, the main body 21 is made up of iron weights (counterweights).

[0030] The fixing member 22 is attached to the main body 21. The fixing member 22 has the function of connecting the connecting member 23 to the main body 21. The end of the connecting member 23 is connected to the fixing member 22. For example, the fixing member 22 is made up of a shackle.

[0031] The connecting member 23 is a member that connects the fixing member 22 and the gripping part 10. The base end of the connecting member 23 is connected to the fixing member 22, and the tip end of the connecting member 23 is connected to the gripping part 10. For example, the connecting member 23 is made of an iron rod-shaped member (iron pipe) or an iron string-shaped member.

[0032] As shown in Figure 6, the connecting member 23 has a tip portion 23a and a fastening member 23b. The claw member 12 is fixed to the tip portion 23a. The fastening member 23b fastens the claw member 12 to the tip portion 23a of the connecting member 23. For example, the fastening member 23b is made up of a bolt and a nut. As shown in Figure 8, when the claw member 12 is attached to the split pipe member 11 by the pin 13, the connecting member 23 supports the gripping portion 10.

[0033] As shown in Figure 9, the connecting member 23 has a structure that allows the angle to be changed from the vertical to the horizontal, i.e., within a range of 0° or more and less than 90°. When the connecting member 23 is connected to the fixing member 22 which is a shackle, the angle of the connecting member 23 is configured to change from the horizontal to the vertical as the movable wire 5 is wound up while the gripping part 10 is gripping the wire 5 and the gripping part 10 rises in the winding direction. For example, the connecting member 23 is a rod-shaped member that can swing between the vertical and horizontal directions with the fixing member 22 as a fulcrum, and restricts the gripping part 10 from moving in the winding direction of the wire 5 beyond the length of the connecting member 23.

[0034] Since the operation of crane 2 must be stopped during the wire 5 replacement work, safe and rapid work is required. The wire 5 replacement work is carried out by detaching both ends of the old wire 5 from the fixed parts 4a and 4b at both ends of the drum 4, attaching the new wire 5 to the fixed part 4a on the fixed side and the fixed part 4b on the movable side as shown in Figure 1, and winding the new wire 5 onto the drum 4 from the movable side as shown in Figure 2.

[0035] The auxiliary device 1 configured in this way is a device for preventing tangled winding during the replacement of the wire 5. Tangled winding that occurs during the replacement of the wire 5 occurs during the sacrificial winding (loose winding) operation, where the snatch block 6 remains on the ground 7 and the wire 5 is wound up without tension, as shown in Figures 11 and 12.

[0036] When wire rope 5 becomes tangled, various problems arise. For example, the load may rotate during lifting and lowering operations, making smooth lifting and lowering impossible. Also, workers may have to work to correct the tangled areas, requiring a long time to replace the wire rope 5. Furthermore, there is a risk of workers reaching into the snatch block 6 or drum 4 to prevent tangles, increasing the risk of fingers getting caught between the drum groove 4c and the wire rope 5 near the drum 4, or between the sheave of the snatch block 6 and the wire rope 5. In addition, the wire rope 5 becomes more prone to kinking and fraying, shortening its lifespan.

[0037] Therefore, the inventors investigated the mechanism of irregular winding during wire replacement through trial and error. As a result, the inventors discovered that irregular winding occurs with a high probability when, during the discard winding of wire 5, tension is not applied to the new replacement wire, and slack occurs in the wire between the winding section of drum 4 and snatch block 6.

[0038] Furthermore, the wire 5 replacement operation is inefficient if it requires a large number of workers, such as crane operators and assistants. From the standpoint of work efficiency, the inventors prioritized the creation of an auxiliary device 1 to prevent tangled winding during the wire 5 replacement operation, assuming that the replacement operation can be performed by one crane operator. As a method of applying tension to the movable wire 5, it is necessary to apply a downward resistance force to the wire 5 between the drum 4 and the snatch block 6. The downward resistance force acting on the wire 5 is the force that opposes the upward movement of the wire 5 when it is wound up in the winding direction (the direction indicated by the arrow in Figure 12).

[0039] Therefore, the inventors have constructed an auxiliary device 1 as a device to assist in the replacement of the wire 5, with the safety and efficiency of the work improved, and which includes a connecting member 23 that supports a gripping part 10 that grips the wire 5 at one end and is connected to a fixing member 22 at the other end. The connecting member 23 has a structure that allows the angle (in the range of 0° or more and less than 90°) to be changed from the vertical to the horizontal direction and connects the gripping part 10 and the fixing member 22. The load from the load part 20 acts on the wire 5 via the gripping part 10, thereby applying tension to the wire 5.

[0040] As shown by the dashed line in Figure 12, when winding the wire 100 onto the drum 4 while it is not being gripped by the gripping part 10, the wire 100 may not be properly guided into the drum groove 4c. In this case, as shown in Figure 13(b), the wire 100 may shift out of the correct drum groove 4c. In contrast, as shown in Figure 12, the auxiliary device 1 allows tension to be applied to the wire 5 between the drum 4 and the gripping part 10 while the gripping part 10 is gripping the wire 5. By applying tension to the wire 5 between the drum 4 and the gripping part 10 using the auxiliary device 1, the wire 5 can be properly guided into the drum groove 4c of the drum 4 when winding the wire, as shown in Figure 13(a). By applying tension to the wire 5 using the auxiliary device 1, the wire 5 is properly guided into the drum groove 4c, preventing the wire 5 from being wound erratically.

[0041] The method for replacing the wire 5 in this embodiment includes a step of pulling out the old wire, a step of lifting the new wire, a step of attaching the new wire, a step of attaching the gripping part 10, a winding step, and a step of removing the gripping part 10. This replacement method uses the auxiliary device 1 when performing the discard winding work on the wire 5.

[0042] In the old wire removal process, the end of the old wire 5 before replacement is removed from the fixing part 4a on the wire-fixed side and the fixing part 4b on the wire-movable side at the end of the drum 4, and the wire 5 is pulled out from the sheave of the snatch block 6. This process is performed with the snatch block 6 placed on the ground 7, as shown in Figure 1. Before the old wire removal process, the snatch block 6 is lowered, as shown in Figure 10, and then placed on the ground 7, as shown in Figure 11.

[0043] In the process of retrieving the new wire, a new wire 5 is prepared, the new wire 5 is passed through the sheave of the snatch block 6, and then both ends of the new wire 5 are pulled up to the drum position using a rope or the like.

[0044] In the process of lifting the new wire, the ends of the new wire 5 are attached to the fixing parts 4a and 4b at both ends of the drum 4.

[0045] In the attachment process for the gripping part 10, a new wire 5 is placed inside the gripping part 10 of the auxiliary device 1, and the split pipe member 11 and the claw member 12 are bolted together to integrate the connecting member 23 and the gripping part 10. In this process, as shown in Figures 5 to 8, the split pipe member 11 and the claw member 12 are integrated in a positional relationship that sandwiches the wire 5. This process also includes adjusting the angle of the connecting member 23 relative to the split pipe member 11 so that tension is applied to the movable wire 5.

[0046] In the hoisting process, the snatch block 6 remains on the ground 7, and the hoisting of the wire 5 by the drum 4 begins. In this process, as shown in Figure 12, the wire 5 is pulled up while being gripped by the gripping part 10.

[0047] The winding process also includes a step to adjust the tension in the movable wire 5. In this step, as shown in Figure 9, the angle of the connecting member 23 is adjusted while the gripping part 10 is attached to the wire 5. For example, if it is necessary to increase the tension in the movable wire 5, the angle of the connecting member 23 is changed to the vertical side (90° side). If there is too much tension on the movable wire 5, the angle of the connecting member 23 is changed to the horizontal side (0° side).

[0048] In the process of removing the gripping part 10, after the discard winding of the new wire 5 is completed, the bolt fastening of the claw member 12 on the gripping part 10, which is still gripping the wire 5, is released, and the auxiliary device 1 is removed from the wire 5. Once this process is completed, the wire 5 replacement work is finished.

[0049] Then, after the wire 5 replacement work is completed, the wire 5 is wound up by the drum 4 so that the snatch block 6 is lifted off the ground 7, as shown in Figure 14. When the snatch block 6 is lifted above the ground 7, tension is applied to the wire 5 due to the weight of the snatch block 6, and the winding of the drum 4 becomes stable. The winding of the wire 5 until the snatch block 6 is lifted above the ground 7 is called a sacrificial winding or temporary winding.

[0050] As described above, according to the embodiment, the gripping portion 10 grips the wire 5, and the end of the connecting member 23 is connected to the fixing member 22, and the connecting member 23 has a structure that allows the angle to be changed from the vertical to the horizontal direction. Therefore, tension can be applied to the wire 5 when replacing the wire 5. This prevents the wire 5 from becoming tangled when discarding the wire 5.

[0051] The structure of crane 2 is not particularly limited and may vary depending on the load capacity and method of lifting. For example, crane 2 may have a simple structure in which a single wire 5 is wound around the hook sheave of the crane hook, or it may be a type in which three or more wires 5 are wound around the sheave.

[0052] Furthermore, the method for applying tension to the movable wire 5 during the discard winding operation only needs to correct the situation in which the movable wire 5 is likely to become slack, and is not limited to methods using machinery or equipment; it may also be done manually. For example, it may be a replacement method in which a worker handles the gripping part 10 via the connecting member 23, or it may be a jig used by a worker. In the case of a jig, the other end of the connecting member 23 is not attached to the fixing member 22, and it is formed in a structure in which a worker grips the other end of the connecting member 23.

[0053] Furthermore, the connecting member 23 is not limited to a rod-shaped member made of iron. For example, the connecting member 23 may be made of an aluminum rod with a ring-shaped, freely rotatable fixing member 22 (shackle) attached to the end on the main body side 21.

[0054] Furthermore, the shape of the claw member 12 is not particularly limited. As shown in Figures 15 and 16, the claw member 12 may have a shape that extends in a direction perpendicular to the extending direction of the connecting member 23.

[0055] Furthermore, the gripping portion 10 may have a ratchet function. For example, the gripping portion 10 can be structured in which a ratchet function is provided to the claw member 12. The claw member 12 opens only in one direction, the winding direction of the wire 5. In this case, once the angle of the connecting member 23 is adjusted, it is possible to wind up the wire 5 while maintaining its tension.

[0056] Furthermore, auxiliary device 1 can be used as a wire tensioner equipped with a ratchet mechanism, a cam gripper, or the like. The scope of application of auxiliary device 1 includes wire tensioners and cam grippers. [Examples]

[0057] (Example 1) In Example 1, the gripping portion 10 is formed in a structure that does not have a ratchet function. As shown in Figure 3, the auxiliary device 1 in Example 1 has a structure in which a claw member 12 is fixed to a split pipe member 11.

[0058] In Example 1, the main body 21 is made of a 20kg iron weight, the fixing member 22 is made of a shackle, and the connecting member 23 is made of an iron pipe rod 1.5m long. The connecting member 23 is 1 inch in diameter. The end of the connecting member 23 has a ring shape that can rotate freely toward the main body 21. The gripping part 10 is made of a split pipe member 11 formed from a 1.5 inch iron pipe, an iron claw member 12, and a pin 13 that can be bolted on.

[0059] In Example 1, the method for replacing the wire 5 in the embodiment was performed. The procedure for replacing the wire in Example 1 includes a step of pulling out the old wire, a step of lifting the new wire, a step of attaching the new wire, a step of attaching the gripping part 10, a winding step, and a step of removing the gripping part 10.

[0060] (Comparative example) The comparative example is the case where the wire 5 is replaced without using auxiliary device 1. The procedure (replacement method) for replacing the wire in the comparative example includes a step of pulling out the old wire, a step of lifting the new wire, a step of attaching the new wire, and a winding step. This replacement method does not use auxiliary device 1 during the sacrificial winding of the wire 5. The wire replacement method in the comparative example differs from the wire replacement method in Example 1 in that it does not include a step of attaching the gripping part 10 and a step of removing the gripping part 10. In the comparative example, tension is generated only by the weight of the wire 100 during the sacrificial winding in the winding step.

[0061] In the winding process of the comparative example, as shown by the dashed line in Figure 12, tension is generated in the wire 100 solely by the weight of the wire 100 while the snatch block 6 is placed on the ground 7. Because sufficient tension is not applied to the movable wire 100, the wire 100 wound onto the drum 4 is not regularly stored in the drum groove 4c. As a result, during this process, a winding condition in which the wire 100 overlaps and crosses (irregular winding) is likely to occur on the drum 4. If irregular winding occurs, the rotation of the drum 4 is stopped during this process, and the worker directly corrects the winding by hand or with a hand hook or similar tool so that the wire 100 is stored in the proper drum groove 4c.

[0062] (Example 2) In Example 2, the gripping portion 10 is formed to have a ratchet function. In Example 2, the auxiliary device 1 includes a pawl member 12 in the ratchet mechanism. The procedure for performing wire replacement work in Example 2 is the same as the replacement method in Example 1.

[0063] In Embodiment 2, the ratchet function of the gripping part 10 allows the claw member 12 to be released when winding up the wire 5, enabling the wire 5 to be wound up. In other words, when the gripping part 10 has a ratchet mechanism, once the tension of the wire 5 has been adjusted, it is basically not necessary to adjust the angle of the connecting member 23, and it is automatically adjusted to an angle at which the wire 5 can be wound up without resistance. That is, in Embodiment 2, after adjusting the angle of the connecting member 23 with respect to the split pipe member 11 during the installation process of the gripping part 10, it is automatically adjusted to an angle at which the wire 5 can be wound up without resistance.

[0064] Furthermore, in the winding process in Example 2, when the winding of the winding device 3 stops, the claw member 12 bites into the wire 5, and tension is applied to the wire 5. According to Example 2, the ratchet function is always active when the gripping part 10 is gripping the wire 5, so it is possible to suppress slack in the movable wire 5.

[0065] For Examples 1 and 2, and the comparative example, the rate of irregular winding during wire 5 replacement and the wire 5 replacement time are compared. These irregular winding rates and wire replacement times are shown in Table 1.

[0066] [Table 1]

[0067] As shown in Table 1, both Example 1 and Example 2 have a 0% irregular winding rate. Examples 1 and 2 can completely suppress the occurrence of irregular winding. The comparative example has an irregular winding rate of 33%. Furthermore, Examples 1 and 2 can shorten the wire replacement time of Example 5 compared to the comparative example. The wire replacement time for Example 1 is 0.6 times that of the comparative example. The wire replacement time for Example 2 is 0.7 times that of the comparative example. Note that the wire replacement times shown in Table 1 are shown as time ratios when the average wire replacement time of the comparative example is set to 1.0. [Industrial applicability]

[0068] According to the present invention, the replacement of wires 5 in cranes 2, hoists, etc., can be carried out in a short time without human intervention, thus having extremely high industrial value. [Explanation of Symbols]

[0069] 1. Wire replacement assist device (assistant device) 2 Cranes 3. Hoisting device 4 drums 4a,4b Fixed part 4c drum groove 5 wires 6. Snatch Block 7 ground 10 Gripping part 11. Half-split pipe member 12 Claw member 13. Pin (support member) 20 Load section 21 Main unit 22 Fixing member 23 Connecting Member

Claims

1. A wire replacement assist device that assists in the replacement work of replacing the wire wound on the drum of a hoisting device installed on a crane, A gripping part that grips the wire that is wound up on the drum and rising during the wire discard winding operation as part of the replacement work, A load unit that applies a load to the gripping unit to cause the wire, which is gripped by the gripping unit, to rise toward the drum, Equipped with, When the drum winds up the wire during the wire unwinding process, the load from the load-bearing part acts on the wire via the gripping part, creating tension in the wire between the drum and the gripping part. A wire replacement assist device characterized by the following features.

2. The aforementioned load unit is The main body is placed on the ground, A fixing member provided on the main body, It has a connecting member that is connected to the fixing member and connects the fixing member and the gripping portion, The gripping portion is supported on one end side of the connecting member. The wire replacement assist device according to feature 1.

3. The gripping portion is, A split pipe member is positioned to cover the wire and extends along the wire, A claw member is positioned between the aforementioned split pipe member and the wire, and is capable of pressing the wire against the split pipe member, It has an axial support member attached to the split pipe member and supporting the claw member, The claw member is pivotable with the support member as the pivot axis. The wire replacement assist device according to feature 2.

4. The claw member is pivotable between a clamping position in which the wire is sandwiched between the split pipe member and an open position in which the wire is released from the split pipe member. When the claw member is in the clamping position, the wire is clamped between the split pipe member and the claw member, causing the gripping portion to grip the wire. The wire replacement assist device according to feature 3.

5. The connecting member is a rod-shaped member that can swing between the vertical and horizontal directions with the fixing member as a fulcrum, and restricts the gripping portion from moving in the winding direction of the wire beyond the length of the connecting member. The wire replacement assist device according to feature 4.

6. The support member is comprised of a fastening member that fixes the claw member to the split pipe member when the claw member is in the clamping position. The wire replacement assist device according to feature 5.

7. The wire is replaced using the wire replacement assist device described in any one of claims 1 to 6. A wire replacement method characterized by the following features.

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