JP7033091B2 - Brake for electric wire drum and wire drawing method using it - Google Patents

Description

The present invention relates to a brake for an electric wire drum that can be attached to a wire reel together with an electric wire drum, and a wire drawing method using the brake.

In the wire extension work of overhead electric wires, it is desirable to maintain an appropriate tension so that the electric wires do not hang down in the extension section. For example, Patent Document 1 discloses a construction method for increasing the tension only in a span that requires a high tension to maintain a separation from a crossing property and keeping the tension in another span low. In this method, a braking device for electric wires is attached to the tower on the drum field side, a drive device is attached to the tower on the engine field side, a brake is added by delaying the sending of electric wires by the braking device, and the sending of electric wires is accelerated by the driving device. By adding a winding force, the wire drawing tension is partially increased only for the span.

Further, Patent Document 2 discloses a wire drawing method for drawing a wire while controlling the slackness of a specific span such as a structure or a road on the ground. The wire drawing device used in this method is attached to a utility pole, and is a delivery means for delivering a linear body by applying a predetermined braking force and an angle detection for detecting the catenary angle of the linear body in the delivery state. A means is provided, and the sending speed of the linear body by the sending means is controlled based on the catenary angle detected by the angle detecting means.

Further, Patent Document 3 discloses a brake device 1 for a wire guide used for these wire drawing works. The brake device 1 includes an inner pad 35 and an outer pad 47 that sandwich the flange 305 of the drum 301 from both sides, a clamp 3 that can be detachably fixed to the wire reeling table 201, and an inner pad 35 and an outer pad 47. Is provided with a crank-shaped handle 67 for pressing the flange 305.

Further, Patent Document 4 discloses a cable feeding device for an optical cable. This cable feeding device is a resistance means that can be switched between a detection member 50 that detects slack in the cable and a resistance means that is switched to release the rotational resistance to the roller 36 in response to the rotational operation of the slack detecting member 50 when the amount of slack in the cable is reduced. (Brake device 40) is provided.

Further, Cited Document 5 discloses a brake device integrated with a drum. This brake device is fixed between the pedestal of the wire and the bolt portion of the drum, and the rotation of the drum is prevented from rotating and reversing by pressing the screw against the brake portion.

Japanese Unexamined Patent Publication No. 10-145918 Japanese Unexamined Patent Publication No. 08-336216 Japanese Unexamined Patent Publication No. 2003-235122 Japanese Unexamined Patent Publication No. 2001-135166 Utility Model Registration No. 3155419

However, since all of the brake devices described in Patent Document 3-5 described above have a structure in which a member (brake pad) is pressed against the flange of the electric wire drum in order to suppress the rotation of the electric wire drum, the rotation of the electric wire drum is suppressed. I couldn't do it well. In particular, when the flange of the electric wire drum is made of resin, it is difficult to control the rotation because the coefficient of friction between the flange and the brake pad is small, and it is difficult to control the feeding speed of the electric wire. If the speed of the wire unwound from the wire drum cannot be controlled well in this way, the wire being unwound will loosen excessively, causing the wire to come into contact with a structure on the ground or to stop the rotation of the wire drum, and then this will coast. Since the wire is unwound and the wire is unwound, it is necessary to rewind the wire. It was necessary to secure two or more people.

Therefore, the present invention has been made in view of such a problem, and a brake for an electric wire drum capable of facilitating control of an electric wire feeding speed from an electric wire drum, and an instability of the electric wire feeding by using the brake. It is an object of the present invention to provide a wire drawing method capable of preventing the drooping of the wire drawn wire and the disintegration of the wound electric wire due to the cause. In addition, the wording "extended wire" in this specification includes not only the case where a new electric wire is extended to a section where the electric wire is not extended, but also the case where the already extended electric wire is replaced with a new electric wire. It shall be included.

The electric wire drum brake according to the present invention according to claim 1 for solving the above problems is a brake for an electric wire drum that is detachably attached to a wire reel together with an electric wire drum, and has a flange on one side of the electric wire drum. A disc rotor that is attached to the side surface of the disc rotor via a drum connecting plate and can rotate with the electric wire drum around the shaft of the wire reel, a brake caliper that applies braking to the rotation of the disc rotor, and the brake caliper. The drum connecting plate is provided with a detent member that is hooked to the frame of the wire reel so as not to rotate together with the disc rotor, and an operating member that controls the braking force of the brake caliper, and the drum connecting plate winds up an electric wire. It is characterized in that the body portion is hooked on a fixing member attached to the side surface of the flange portion in order to fix the body portion to the flange portion of the electric wire drum .

In order to solve the above problems, the present invention according to claim 2 is the electric wire drum brake according to claim 1. In the electric wire drum brake, the operating member presses the brake pad holding the disc rotor by rotating a knob. The braking force is controlled by adjusting the braking force.

The wire drawing method using the electric wire drum brake according to the present invention according to claim 3 in order to solve the above problem is the wire drawing method using the electric wire drum brake, and the electric wire according to claim 1 or 2 . The step of attaching the brake for the drum to the wire reel together with the electric wire drum, and one end side of the long object drawn through the wire extension section are connected to the electric wire wound around the electric wire drum, and the long object is connected. Winding of the long object in a state where the step of attaching the other end side of the object to the winch and the braking force of the brake caliper are set to a predetermined braking force that does not hinder the feeding of the electric wire by operating the operating member. A step of starting the winding of the winch and a step of operating the operating member to stop the rotation of the electric wire drum at the timing when the electric wire is extended in the extended section. It is characterized in that the hanging wire and the unwinding wire are prevented from being loosened due to the instability of the wire feeding.

The electric wire drum brake according to the present invention can be attached to and detached from the electric wire drum together with the electric wire drum, and the braking target of the brake caliper is not the electric wire drum flange itself but a disc rotor attached to the flange. Therefore, it is possible to reliably brake with a high braking force regardless of the material of the electric wire drum. Moreover, the disc rotor is attached to the flange of the electric wire drum via the drum connecting plate, and the detent member is hooked on the wire reel to prevent the brake caliper from rotating, so it can be attached to and detached from the wire drum together with the wire drum. Although it is possible, the electric wire drum brake can obtain a high braking force. Therefore, the electric wire drum brake according to the present invention can easily control the feeding speed of the electric wire from the electric wire drum.

Further, according to the wire drawing method according to the present invention, since the electric wire drum brake according to the present invention is used, it becomes easy to control the feeding speed of the electric wire from the electric wire drum, and the electric wire is extended during the electric wire drawing. By stably maintaining a predetermined braking force that does not hinder the feeding, it is possible to stabilize the feeding speed of the electric wire and prevent the electric wire being extended from being excessively loosened (hanging of the extended wire). In addition, after the wire is unwound, the rotation of the wire drum is surely stopped at the timing when the winch stops to prevent the continuation of rotation due to inertia, so that the wire wound around the wire drum can be prevented from loosening. can. Therefore, the wire drawing method according to the present invention can surely prevent the hanging wire and the unwinding of the wound wire due to the instability of the wire feeding. Further, since this wire drawing method can be executed while the electric wire drum is installed on the ground, the setting before the wire drawing is easy. Therefore, even if two wires are simultaneously fed, it is sufficient to secure one worker for feeding the wires from the wire drum.

It is a schematic diagram which shows one Embodiment of the wire drawing method which concerns on this invention. It is a perspective view of the wire leader to which the electric wire drum brake and the electric wire drum are attached. It is a figure which looked at a part of the wire lead with the brake for an electric wire drum and the electric wire drum attached from the side. It is the figure which looked at the brake for an electric wire drum from the side of a wire lead. It is the figure which looked at the brake for an electric wire drum from the front side of a wire lead. It is a figure explaining the attachment method of the electric wire drum brake to the electric wire drum. It is the figure which looked at the wire lead with the electric wire drum brake and the electric wire drum attached from the front side. It is a figure explaining the operation of the electric wire drum brake (when the braking force is the minimum). It is a figure explaining the operation of the electric wire drum brake (in the case of the maximum braking force). It is an exploded view of the electric wire drum brake, the electric wire drum, and the electric wire lead. It is a flowchart explaining the procedure of the wire drawing method.

Hereinafter, the electric wire drum brake and the wire drawing method according to the present invention will be described in detail based on a preferred embodiment.

[Overview of wire drawing method]
First, the outline of the wire drawing method will be described. Here, it is assumed that the electric wire is extended to the section where the electric wire is not extended. FIG. 1 is a schematic diagram showing an embodiment of a wire drawing method according to the present invention. As shown in the figure, in the wire drawing method of the present embodiment, the work vehicle (winding vehicle) 300 is arranged at one end of the wire drawing section A of the electric wire, and the wire reeling table 10 is arranged at the other end. Both the work vehicle 300 and the line guide 10 are arranged on the ground. Of these, a winch 200 is installed in the work vehicle 300, an electric wire drum 30 is mounted on the wire reeling table 10, and a new electric wire 41 to be extended is preliminarily wound on the electric wire drum 30. Prior to the extension of the electric wire 41, a rope 40 for towing (an example of a long object) is laid in the extension section A, and one end side of the rope 40 is attached to the winch 200, and the other end of the rope 40 is attached. Is tied to the tip end side of the wire 41. The wire drawing of the electric wire 41 in the present embodiment is performed by a worker (not shown) who winds the rope 40 (and by extension, the electric wire 41) by the winch 200, and unwinds the electric wire 41 from the electric wire drum 30. It is performed by the cooperation of two people with the worker 100 who performs the work.

Here, since the winding speed of the rope 40 by the winch 200 (the winding speed of the electric wire 41) is set to an appropriate predetermined speed, the operator who winds the electric wire 41 (not shown). The role of the rope 40 is basically to determine the start timing and the stop timing of the winding of the rope 40.

On the other hand, a brake for the electric wire drum, which will be described later, is attached to the electric wire leader 10 together with the electric wire drum 30, and the worker 100 who unwinds the electric wire 41 operates the brake for the electric wire drum during the wire drawing work. The feeding speed of the electric wire 41 is controlled.

[Electric wire drum]
Next, the electric wire drum will be described. FIG. 2 is a perspective view of the wire drum brake and the wire drum to which the wire drum is attached, and FIG. 3 is a side view of a part of the wire drum to which the wire drum brake and the wire drum are attached. ..

As shown in the figure, the electric wire drum 30 generally includes a cylindrical body portion 30A for winding the electric wire 41 and a pair of disk-shaped flange portions 30a and 30b attached to both end ends of the body portion 30A. The flange portions 30a and 30b and the body portion 30A are fixed by fixing members 31 (bolts 31a and nuts 31b). The materials of the body 30A and the flanges 30a and 30b of the electric wire drum 30 are, for example, PVC (polyvinyl chloride mixture), PE (polyethylene), FEP (synthetic resin such as Teflon (registered trademark)), and wood. .. Further, the length of the electric wire 41 that can be wound up by the body portion 30A is, for example, about 300 m.

Here, in the electric wire drum 30 of the present embodiment, four bolts 31a are inserted from the flange portion 30a of the electric wire drum 30 toward the flange portion 30b, and the tips of these four bolts 31a are tightened with nuts 31b, respectively. It is worn. Further, shaft holes 30c and 30d (FIGS. 7 and 10) for inserting the shaft 11 of the wire lead 10 are provided at the centers of the flange portions 30a and 30b, respectively, and the four bolts 31a are provided with the four bolts 31a. The shaft holes 30c and 30d are arranged at substantially equal intervals around the shaft holes 30c and 30d.

Such an electric wire drum 30 is detachably attached to the electric wire leader 10. In the mounted state, the shaft 11 of the wire reeling table 10 is inserted into the shaft holes 30c and 30d (FIGS. 7 and 10) of the flange portions 30a and 30b, and the electric wire drum 30 can rotate around the shaft 11. Then, the electric wire drum brake 20 is detachably attached to the electric wire reeling table 10 together with the electric wire drum 30.

[Brake for electric wire drum]
Next, the electric wire drum brake will be described. FIG. 4 is a view of the electric wire drum brake from the side of the wire lead, FIG. 5 is a view of the electric wire drum brake from the front side of the wire lead, and FIG. 6 is the mounting of the electric wire drum brake on the electric wire drum. The figure explaining the method, FIG. 7 is a view which saw the electric wire drum brake and the wire lead with the electric wire drum attached from the front side, and FIG. 8 is a figure explaining the operation of the electric wire drum brake (when the braking force is the minimum). ), FIG. 9 is a diagram for explaining the operation of the electric wire drum brake (when the braking force is maximum), and FIG. 10 is an exploded view of the electric wire drum brake, the electric wire drum, and the electric wire lead.

As shown in FIGS. 2 and 3 described above, the electric wire drum brake 20 is detachably attached to the electric wire drum 30 together with the electric wire drum 30. Then, as shown in FIGS. 4 to 10, the electric wire drum brake 20 includes a bearing 28 inserted into the shaft 11 of the wire reeling table 10, a disc rotor 22 rotatably arranged around the bearing 28, and a disc rotor 22. The drum connecting plate 21 fixed to the disc rotor 22, the brake caliper 23 that applies braking force to the disc rotor 22, and the bearing 28 and the brake caliper 23 are fixed to the right frame (hereinafter the same) 12a in FIG. 7 of the wire leader 10. It is provided with a detent member 24 for operating the brake caliper 23 and an operating member 25 for operating the brake caliper 23 by the operator 100.

The drum connecting plate 21 has a shaft hole 21C through which the shaft 11 is inserted (FIG. 6), and is a long plate-shaped member formed so as to extend in the diameter direction of the shaft hole 21C. A pair of girder-shaped hooking portions 21A, 21A long in the radial direction of the shaft hole 21C protrude from the left side surface (lower side surface in FIG. 6) on one side of the drum connecting plate 21 with the center line X1 of the shaft hole 21C interposed therebetween. On the left side surface (lower side of FIG. 6) on the other side, a pair of girder-shaped hooking portions 21B and 21B long in the radial direction of the shaft hole 21C are provided so as to project. The distance L5 between the pair of hooking portions 21A and 21A and the distance L5 between the pair of hooking portions 21B and 21B are outside the fixing members 31 (bolts 31a and nuts 31b) provided on the flange portion 30a of the electric wire drum 30, respectively. It is set to be slightly wider than the diameter L6. The drum connecting plate 21 is hooked to the fixing member 31 of the electric wire drum 30 (bolts 31a and nuts 31b provided on the flange portion 30a) via these hooking portions 21A, 21A, 21B and 21B. Specifically, the hooking portions 21A and 21A on one side of the drum connecting plate 21 are hooked on one of the pair of fixing members 31 (bolts 31a and nuts 31b) arranged in the radial direction of the shaft hole 30c of the electric wire drum 30. Then, the hooking portions 21B and 21B on the other side of the drum connecting plate 21 are hooked to the other of the pair of fixing members 31 (bolts 31a and nuts 31b). As described above, the fixing member 31 in the present embodiment is a bolt 31a and a nut 31b attached to the side surface of the flange portion 30a in order to fix the flange portion 30a to the body portion 30A of the electric wire drum 30. Although it is used, the present invention is not limited to this, and a predetermined member may be provided on the flange portion 30a as a fixing member 31 in order to fix the drum connecting plate 21. In this way, the hooking portions 21A and 21A on one side of the drum connecting plate 21 are hooked to one of the pair of fixing members 31 (bolts 31a and nuts 31b) arranged in the radial direction of the shaft hole 30c of the electric drum 30. If the hooking portions 21B and 21B on the other side of the drum connecting plate 21 are hooked to the other of the pair of fixing members 31 (bolts 31a and nuts 31b), the electric wire drum 30 rotates with the shaft 11 as the rotation axis. Along with this, the drum connecting plate 21 can be interlocked so as to rotate together. The shape of the drum connecting plate 21 is not limited to that shown in FIG. 6, for example, the width of the drum connecting plate 21 in the vicinity of the shaft hole 21C is the vicinity of the hooking portions 21A and 21A and the hooking. It may be set narrower than the width of the drum connecting plate 21 in the vicinity of the portions 21B and 21B. Further, the size of the shaft hole 21C shall be appropriately set according to the diameter of the shaft 11 and the like. Further, the shapes of the elongated holes 21a and 21b of the drum connecting plate 21 can be arbitrarily selected, and the elongated holes 21a and 21b may not be provided in the drum connecting plate 21.

Since the disc rotor 22 is attached to the side surface of the flange portion 30a on one side of the electric wire drum 30 via the drum connecting plate 21 and is connected to the shaft 11 of the wire reeling platform 10 via the bearing 28, the shaft 11 is connected. It can rotate together with the electric wire drum 30 as a rotating shaft.

The brake caliper 23 applies braking to the rotation of the disc rotor 22. The brake caliper 23 is provided with at least a pair of brake pads 23a and 23b that sandwich the disc rotor 22 from both sides.

The detent member 24 is a member that holds the brake caliper 23 together with the bearing 28, and is hooked on the upper flange 12c of the right frame 12a of the wire reeling table 10 so that the brake caliper 23 and the bearing 28 do not rotate together with the disc rotor 22. It will be stopped. When the detent member 24 is viewed from the side, it has a substantially I-shape (FIG. 4), and when viewed from the front, it has a substantially Z-shape (FIG. 5). In the example shown in FIG. 4, a pair of detent members 24, 24 are used, and these pair of detent members 24, 24 sandwich the brake caliper 23 and the bearing 28 from the front and rear (left and right in FIG. 4). In this way, the fixing members 24A and 24A are fixed to each other, and one end of the pair of detent members 24 and 24 is hooked on the upper flanges 12c and 12c of the right frame 12a of the wire reeling table 10. Further, the pair of detent members 24, 24 are fixed to the outer peripheral side of the bearing 28 by a plurality of fixing members 24B, 24B. The fixing members 24A and 24B are composed of, for example, bolts and nuts. Here, as shown in FIG. 3, the upper part of the right frame 12a of the wire reeling table 10 is bent in a dogleg shape, and the bearing 12A of the shaft 11 is attached to the triangular region inside the bent portion. The plate-shaped members (upper flanges 12c and 12c) are provided by welding or the like in a posture of intersecting the shaft 11. Here, the portions of the plate-shaped member located on both sides of the bearing 12A are referred to as upper flanges 12c and 12c, respectively. Then, in the present embodiment, the key-shaped tip portions of the pair of detent members 24, 24 are hooked to the lower ends of the upper flanges 12c, 12c so as to wrap around from the lower side, respectively. Therefore, even when the electric wire drum 30 rotates together with the disc rotor 22 with the shaft 11 inserted through the bearing 12A of the wire reeling table 10 as a rotating shaft, the rotational force of the electric wire drum 30 and the disc rotor 22 is a pair. Since any one of the detent members 24 and 24 works in the direction of pushing up the lower end of the upper flange 12c, the pair of detent members 24 and 24 fixed to each other and the upper flanges 12c and 12c do not come off. .. Therefore, the pair of detent members 24, 24 and the brake caliper 23 (see FIG. 4) and the bearing 28 (see FIG. 4) held by the pair of detent members 24, 24 are the electric wire drum 30 and the disc rotor 22. It does not rotate together with it, and is fixed to the side of the wire reeling table 10. That is, the pair of detent members 24, 24 has a function of preventing the brake caliper 23 and the bearing 28 from rotating together with the disc rotor 22.

The operation member 25 is a member that controls the braking force of the brake caliper 23. The operating member 25 of the present embodiment adjusts the distance between the brake pads 23a and 23b holding the disc rotor 22 (pressing pressure of the brake pads 23a and 23b) by rotating the knob 25a, thereby adjusting the braking force of the brake caliper 23. Is designed to control. Here, the pair of brake pads 23a and 23b of the brake caliper 23 are attached to the tip sides of the pair of arms 23A and 23B, respectively, and the portion of the pair of arms 23A and 23B on the tip side from the center is the pivot pin 23D (FIG. 8). , FIG. 9), and a piston 23C is arranged on the rear end side of the pair of arms 23A and 23B. A rod 25b is connected to the piston 23C, the rod 25b is fastened to one arm 23A with a nut 23F, and the knob 25a described above is fixed to the tip of the rod 25b. When the knob 25a rotates, the rod 25b rotates and pushes (or separates) the piston 23C toward the other arm 23B, so that the distance between the pair of arms 23A and 23B on the rear end side changes and the pivot The pair of brake pads 23a and 23b located on the tip side of the pair of arms 23A and 23B are pressed (or pulled apart) with a stronger force by the principle of leverage with the pin 23D (FIGS. 8 and 9) as a fulcrum. (See FIGS. 8 and 9). Therefore, the operator 100 can adjust the braking force by appropriately rotating the knob 25a. Further, the rotation position of the knob 25a can be fixed at an arbitrary position, and the braking force can be kept constant by fixing the rotation angle of the knob 25a at a predetermined position. In this case, the operator 100 does not need to operate the knob 25a in order to maintain the braking force of the brake caliper 23 at a constant value. In addition to the rotatable knob 25a, the operating member 25 can also be configured to control the braking force of the brake caliper 23 by, for example, lever operation. Further, the feeding speed of the electric wire 41 may be configured to be switchable in at least two steps of slow speed.

Hereinafter, the operation of the electric wire drum brake 20 will be described mainly with reference to FIGS. 8 and 9. The electric wire drum brake 20 having the above configuration is attached to the electric wire drum 30 together with the electric wire drum 30. Then, when the operator 100 adjusts the rotation position of the knob 25a of the operating member 25 to maximize the distance between the brake pads 23a and 23b in the brake caliper 23 (that is, the frictional force is set to zero) (FIG. 8). Since the force that the brake pads 23a and 23b sandwich the disc rotor 22 from both sides (that is, the braking force of the brake caliper 23 with respect to the disc rotor 22) does not work, the drum connecting plate 21 and the electric wire drum 30 fixed to the side of the disc rotor 22 do not work. (The portion painted in gray in FIG. 8) can also rotate at a relatively high speed without receiving the braking force from the brake caliper 23. On the other hand, when the operator 100 adjusts the rotation position of the knob 25a of the operating member 25 to minimize the distance between the brake pads 23a and 23b in the brake caliper 23 (that is, set the frictional force to the maximum) (FIG. 9). As shown by the white arrow, the maximum braking force of the brake caliper 23 acts on the disc rotor 22, so that the drum connecting plate 21 and the electric wire drum 30 fixed to the side of the disc rotor 22 (filled with gray in FIG. 9). The portion) also receives the braking force from the brake caliper 23, reduces the rotation speed, and stops. Further, from the state of FIG. 8, the operator 100 adjusts the rotation position of the knob 25a of the operating member 25, and sets the distance between the brake pads 23a and 23b in the brake caliper 23 to an appropriate value between the maximum and the minimum (that is,). When the frictional force is set to an appropriate value), the braking force of the brake caliper 23 with respect to the disc rotor 22 is set to an appropriate value, so that the drum connecting plate 21 and the electric wire drum 30 fixed to the side of the disc rotor 22 ( The rotation speed of the portion filled with gray in FIG. 8) can be set to an appropriate speed lower than the above speed.

[How to wear]
Hereinafter, a method of mounting the electric wire drum 30 and the electric wire drum brake 20 will be described mainly with reference to FIG. 10. First, the shaft 11 of the wire leader 10 is inserted into the shaft holes 30c and 30d of the flange portions 30a and 30b of the electric wire drum 30. Next, for example, the bearing 28 of the electric wire drum brake 20 is inserted into the shaft 11 inserted through the flange portion 30a, and the hooking portions 21A and 21B of the drum connecting plate 21 of the electric wire drum brake 20 are flanged. It is hooked on the fixing member 31 (bolt 31a, nut 31b) of 30a. Next, the shaft 11 inserted into the shaft holes 30c and 30d of the flange portions 30a and 30b of the electric wire drum 30 is fitted with the electric wire drum brake 20 together with the bearing 12A on the upper part of the right frame 12a and the upper part of the left frame 12b of the wire leader 10. It is mounted between the bearing 12B of. At the time of mounting, the pair of detent members 24, 24 of the electric wire drum brake 20 are hooked on the upper flanges 12c, 12c of the right frame 12a.

[Procedure of wire drawing method]
Next, the procedure of the wire drawing method will be described. FIG. 11 is a flowchart illustrating the procedure of the wire drawing method. The wire drawing method of the present embodiment can also be applied to a wire drawing accompanied by simultaneous feeding of two wires. Further, when the existing electric wire is replaced, that is, the existing electric wire is replaced, the existing electric wire can be used as a substitute for the rope 40.

First, the operator 100 of the electric wire drum brake 20 attaches the electric wire drum 30 and the electric wire drum brake 20 to the wire reeling table 10 as described above (step S1). Further, the worker 100 connects one end side of the rope 40 drawn through the wire extension section A to the electric wire 40 (step S2), and the worker of the winch 200 (not shown) draws the rope 40 through the wire extension section A. The other end side of the rope 40 is attached to the winch 200 (step S3). The order in which steps S1, S2, and S3 are executed is not limited to the order in which steps S1, S2, and S3 are executed, and any two or more steps of steps S1, S2, and S3 are executed in parallel. You may.

Next, in a state where the worker 100 of the electric wire drum brake 20 operates the operating member 25 to set the braking force of the electric wire drum brake 20 to a predetermined braking force, the operator of the winch 200 operates the rope by the winch 200. Winding of 40 is started (step S4). Here, the predetermined braking force is such that the feeding force of the rope 40 from the electric wire drum 30 corresponding to the winding of the winch 200 is not hindered.

After the start of winding, the operator 100 of the electric wire drum brake 20 or the operator of the winch 200 determines whether or not the extension of the electric wire 41 to the extension section A is completed (step S5), and is not completed. In the case of (No), the winding of the rope 40 by the winch 200 is continued, and when the wire drawing of the electric wire 41 with respect to the wire drawing section A is completed (Yes), the process proceeds to the next step.

Next, when the wire drawing is completed, the worker 100 of the electric wire drum brake 20 stops the winding of the rope 40 by the winch 200, and the operator 100 of the electric wire drum brake 20 stops the rotation of the electric wire drum 30. The braking force of the brake 20 is set to the maximum, and the flow is terminated (step S6). At this time, there is a difference between the timing at which the operator of the winch 200 stops winding the rope 40 by the winch 200 and the timing at which the operator 100 of the electric wire drum brake 20 sets the braking force of the electric wire drum brake 20 to the maximum. One of the operator of the winch 200 and the operator 100 of the electric wire drum brake 20 gives a signal to the other by voice or the like in order to reduce the size.

[Effect of embodiment]
As described above, the electric wire drum brake 20 according to the present embodiment can be attached to and detached from the electric wire drum 30 together with the electric wire drum 30, and the braking target of the brake caliper 23 is not the flange portion 30a of the electric wire drum 30 itself. Since the disc rotor 22 is attached to the flange portion 30a, it is possible to reliably perform braking with a high braking force regardless of the material of the electric wire drum 30 (particularly the material of the flange portion 30a). Moreover, the disc rotor 22 is attached to the flange portion 30a of the electric wire drum 30 via the drum connecting plate 21, and the detent member 24 is hooked on the right frame 12a of the wire leader 10 in order to prevent the brake caliper 23 from rotating. Therefore, although the electric wire drum 30 can be attached to and detached from the wire reeling table 10, the electric wire drum brake 20 can obtain a high braking force. Therefore, the electric wire drum brake 20 according to the present embodiment can easily control the feeding speed of the electric wire 41 from the electric wire drum 30.

Further, according to the wire drawing method according to the present embodiment, since the electric wire drum brake 20 according to the present embodiment is used, it becomes easy to control the feeding speed of the electric wire 41 from the electric wire drum 30, and the electric wire 41 is extended. By stably maintaining a predetermined braking force that does not hinder the feeding of the electric wire 41 in the wire, the feeding speed of the electric wire 41 is stabilized and the electric wire 41 being extended is excessively loosened (hanging of the extended wire). Can be prevented. Further, after the electric wire 41 is unwound, the electric wire 41 wound around the electric wire drum 30 is loosened by surely stopping the rotation of the electric wire drum 30 at the timing when the winch 200 is stopped to prevent the electric wire drum 30 from continuing the rotation due to inertia. Can be prevented. Therefore, the wire drawing method according to the present embodiment can surely prevent the hanging wire and the unwinding wire from being loosened due to the instability of the wire feeding. Further, since this wire drawing method can be executed while the electric wire drum 30 is installed on the ground, the setting before the wire drawing is easy. Therefore, even if two wires are simultaneously fed out, it is sufficient to secure one worker for feeding out the electric wire 41 from the electric wire drum 30.

As described above, the preferred embodiment of the present invention has been described in detail, but the present invention is not limited to the specific embodiment, and is within the scope of the gist of the present invention described in the claims. Needless to say, various modifications and changes are possible.

10 Wire lead 11 Shaft 12a Right frame 12b Left frame 12c Upper flange 12A Brake 12B Brake 20 Electric wire drum brake 21 Drum connecting plate 21a Long hole 21b Long hole 21A Hooking part 21B Hooking part 22 Disc rotor 23 Brake caliper 23a Brake Pad 23b Brake pad 23A Arm 23B Arm 23C Piston 23D Pivot pin 23F Nut 24 Anti-rotation member 24A Fixing member 24B Fixing member 25 Operating member 25a Knob 25b Rod 30 Electric wire drum 30A Body 30a Axle 30b 31 Fixing member 31a Brake 31b Nut 40 Rope 41 Wire 100 Worker 200 winch 300 Work vehicle

Claims (3)

In the electric wire drum brake that can be detachably attached to the electric wire drum together with the electric wire drum
A disc rotor that is attached to the side surface of the flange portion on one side of the electric wire drum via a drum connecting plate and can rotate together with the electric wire drum with the shaft of the wire reel as a rotation axis.
A brake caliper that applies braking to the rotation of the disc rotor,
A detent member that is hooked to the frame of the wire reel so that the brake caliper does not rotate together with the disc rotor.
An operating member that controls the braking force of the brake caliper, and
Equipped with
The drum connecting plate is a brake for an electric wire drum, characterized in that a body portion for winding an electric wire is hooked on a fixing member attached to a side surface of the flange portion in order to fix the body portion to the flange portion of the electric wire drum portion . In the electric wire drum brake according to claim 1,
The operating member is a brake for an electric wire drum, characterized in that the braking force is controlled by adjusting the pressing force of a brake pad holding the disc rotor by rotating a knob. In the wire drawing method using the electric wire drum brake,
The step of attaching the electric wire drum brake according to claim 1 or 2 to the electric wire drum together with the electric wire drum, and
A step of connecting one end side of a long object drawn through a wire drawing section to an electric wire wound around the electric wire drum and attaching the other end side of the long object to a winch.
A step of starting winding of the long object in a state where the braking force of the brake caliper is set to a predetermined braking force that does not hinder the feeding of the electric wire by operating the operating member.
A step of stopping the winding of the winch and stopping the rotation of the electric wire drum by operating the operating member at the timing when the electric wire is extended in the extended section.
A wire drawing method using a brake for an electric wire drum, which is configured to include and prevent the drooping of the extended electric wire and the loosening of the wound electric wire due to the instability of the electric wire feeding.

Images