Traction device for overhead power transmission lines and tower winch used therefor

Abstract

To provide a tower-mounted winch that can control the pulling force of overhead power transmission lines by rotating a rope sheave, which winds up the wire in less than one turn, using a servo motor. [Solution] The overhead power line traction device includes a wire traction mechanism 33 in which a rope sheave 34 is rotated to pull the wire 5, a reduction gear 44 and a servo motor 45 connected to the rotation shaft 35 of the rope sheave 34, a tower-mounted winch 30 in which the winch body 31 is attached to the tower column 4 at the base of the arm portion 3 of the power transmission tower 2, a servo motor control device 47 and a battery 46 are installed, the wire 5 which is unfurled from the tower-mounted winch 30 is unfurled to the front of the arm portion 3 and connected to the end of the overhead power line 1, and the tower-mounted winch 30 winds up the wire 5 and pulls the end of the overhead power line 1 to the position of the insulator 13.

Description

Technical Field

[0001] The present invention relates to, for example, a traction device for an overhead transmission line and a tower winch used therefor, and particularly to a traction device for an overhead transmission line for pulling an overhead transmission line into an arm portion of a transmission tower and a tower winch used therefor.

Background Art

[0002] FIG. 10 is a diagram showing a traction device for an overhead transmission line and a ground winch used therefor according to a first conventional example. In this device, on the ground on the side of a transmission tower 2, there are provided a ground winch 6 (crawler winch) having a wire winding drum 6a around which a wire 5 is spirally and multiply wound and an induction motor with a brake and clutch (not shown) for rotationally driving the wire winding drum 6a, a generator 7 for supplying power to the induction motor, a weight 8 (mooring means) for firmly fixing the ground winch 6 in position, and a winch control device 9. And a plurality of jumper carriages 10, 11, 12 for guiding the wire 5 fed out from the wire winding drum 6a and winding it up to the tip of the arm portion 3 of the transmission tower 2 are attached to the lower part, upper part, and lower part of the arm portion 3 of the transmission tower 2.

[0003] The wire 5 is pulled out to the front of the arm portion 3 of the transmission tower 2 and connected to the end of the overhead transmission line 1 separated from the transmission tower 2, and the wire winding drum 6a is rotationally driven by lever operation to wind up the wire 5, so that the end of the overhead transmission line 1 that is slack in a state where the tensile force is appropriately increased is pulled to the insulator 13 which is the connection portion at the tip of the arm portion 3 of the transmission tower 2.

[0004] When pulling the wire 5 by the ground winch 6, for example, the rotation of the wire winding drum 6a in the winding direction is performed by lever operation. At that time, while monitoring the value of the speed display portion that displays the wire winding speed of the wire winding drum 6a which is displayed in relation to the wire 5 traction force in the winch control device 9, the traction is performed so that a tension of a predetermined value or more does not act on the overhead transmission line 1.

[0005] Figure 11A shows a lifting winch relating to a second conventional example. This lifting winch 60 has a winch body 61 and an induction motor 62. Figure 11B is a longitudinal cross-sectional view of the lifting winch. The winch body 61 has a wire pulling mechanism that includes a rope sheave 63 that winds the wire in less than one turn, a wire winding roll 65 provided on one swinging end of a bent swinging ring 64, and a grip roll 66 provided on the other swinging end of the bent swinging ring 64. The rope sheave 63 is rotationally driven by the induction motor 62, and further power is supplied to the induction motor by a generator (not shown) installed on the ground, and the induction motor is controlled by a motor controller (not shown) installed on the ground. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2023-66127 [Patent Document 2] Japanese Patent Application Publication No. 58-136209 [Overview of the project] [Problems that the invention aims to solve]

[0007] If, during the operation, tension exceeding a predetermined value is applied to the overhead power line and the end of the overhead power line is connected to the insulator at the tip of the transmission tower's arm, it could lead to accidents such as the arm breaking, or major damage such as the transmission tower collapsing or the arm breaking due to strong winds during a typhoon or low pressure system. Therefore, when pulling overhead power lines to connect them to transmission towers, it is extremely important to ensure that the overhead power line is in a sagging state so that tension exceeding a predetermined value is not applied to it.

[0008] In this regard, according to the conventional technology shown in Figure 10, the wire winding drum 6a is controlled by switching a swing lever attached to the wire winding drum 6a between an upright and a downed position, which is linked to the on / off switching of the induction motor and the brake, switching the drive stop and rotation drive of the wire winding drum 6a. The induction motor is rotated by an electromagnet in the stator, and only the speed can be adjusted. Because the rotor has a large inertia and the rotation start and stop operations are slow, the control is complex. Therefore, when winding the wire 5, the winch operator on the ground repeatedly switches the swing lever between an upright and a downed position while monitoring the value of the motor rotation speed display. In addition, a monitor on the tower monitors the pulling status of the wire 5, and the winch operator communicates with the monitor on the tower via radio. For this reason, considerable skill is required to properly control the pulling of the overhead power transmission line 1.

[0009] Furthermore, according to the conventional technology shown in Figure 10, the distance between the ground winch 6 and the installation location of the overhead power transmission line 1 on the transmission tower 2 is several tens of meters, requiring a wire several tens of meters long; since the wire several tens of meters long is wound up via multiple jump pulleys 10, 11, and 12, there are many dangerous points where the wire 5 is at an inner angle; at times, it is necessary to install up to four ground winches 6 and eight wires 5, requiring a large number of personnel and time; and communication between the tower and the ground is done by radio, which carries the risk of signal errors due to interference.

[0010] When a conventional lifting winch, as shown in Figures 11A and 11B, is installed on the top of a power transmission tower, the rotational drive means for the rope sheave, which winds the wire in less than one turn as part of the wire traction mechanism, is an induction motor. Therefore, only the winding speed of the rope sheave can be adjusted, and, as with the conventional technology shown in Figure 5, the rotor has a large inertia and the rotation start and stop operations are slow, making the control complex.

[0011] Therefore, the inventors of this invention have developed a tower-mounted winch that is lightweight and can be easily lifted and installed on top of a tower, as an alternative to a ground-mounted winch, thereby solving the aforementioned problems of the conventional technology.

[0012] The present invention was made to solve these problems, and aims to provide an overhead power line pulling device and a tower-mounted winch that can pull overhead power lines by rotating a rope sheave that winds up the wire in less than one turn as the wire pulling mechanism of a tower-mounted winch, and in particular by controlling the rotation and torque of the rope sheave by controlling a servo motor, thereby enabling safe and easy control of the pulling force on the overhead power line, and enabling the connection of the end of the overhead power line to the insulator at the tip of the arm of the transmission tower with a tension of less than a predetermined value. [Means for solving the problem]

[0013] The overhead power line traction device according to the first aspect of the present application, in order to achieve the above objective, has a tower-mounted winch in which the winch body is attached to the tower column at a position corresponding to the base of the arm portion of the power transmission tower, and further comprises a servo motor control device for rotational control and torque control of the servo motor, and a battery or generator provided near the tower-mounted winch and / or on the ground for power supply to the servo motor and the servo motor control device, wherein the wire unwound from the tower-mounted winch is wound around a pulley and guided to the front of the arm portion and further unwound so that the tip of the wire is connected to the end of the overhead power line away from the arm portion, and the wire is towed to the position of an insulator provided on the arm portion by winding up the wire from the tower-mounted winch.

[0014] A tower-mounted winch according to a second aspect of the present application is a tower-mounted winch used in a traction device for overhead power transmission lines according to the first aspect of the present application in order to achieve the above objective, and includes a rope sheave around which a wire is wound in less than one turn, a wire guide section that guides the base end of the wire to be wound around the rope sheave and also guides it to be led out after winding, a structure including a roller seesaw section provided between the rope sheave and the wire guide section, a bent swing ring whose bent portion is pivotally supported on the winch body and is swingable, a wire winding roll provided on one of the swinging ends of the bent swing ring, and one or more grip rolls provided on the other swinging end of the bent swing ring, and is a seesaw structure in which when either the wire winding roll or the grip roll approaches the circumferential surface of the rope sheave, the other moves away from the circumferential surface of the rope sheave, and when the rope sheave is rotated to pull the wire, the wire winding The configuration includes a roller seesaw section in which, as the securing roll separates from the rope sheave, the grip roll approaches the rope sheave and rotates in contact with the wire, pressing and locking it into the groove on the circumferential surface of the rope sheave, and subsequently, when the rope sheave stops rotating, the grip roll, which is in contact with the wire and has stopped rotating, holds the wire in the pressed-lock state of the rope sheave; a wire pulling mechanism section further includes a wire pulling member that is tightly fastened to the end of the wire after it is led out from the wire guide section, causing the rope sheave to rotate in one direction to pull the wire, and locking the rope sheave to stop rotating and prevent the wire from being fed out toward the overhead power line; a reduction gear whose output shaft is connected to the rotation axis of the rope sheave; a servo motor connected to the input shaft of the reduction gear; and the winch body that supports the wire pulling mechanism, the reduction gear, and the servo motor.

[0015] In a third aspect of the present application, in the second aspect described above, with respect to the rope sheave, the rotation axis of the rope sheave is inserted through the shaft hole of the winch body, one surface of the rope sheave is close to the side surface of the winch body, the vicinity of the rope sheave is surrounded by a stepped surface provided on the side surface of the winch body, except for the roller seesaw portion, and with respect to winding the wire onto the rope sheave, the base end of the wire is introduced between the wire winding roll and the rope sheave through the wire guide portion, and the wire is fed in as is, thereby winding it onto the rope sheave along the gap between the circumferential surface of the rope sheave and the stepped surface provided on the side surface of the winch body.

[0016] In a fourth aspect of the present application, in the second aspect described above, the rope sheave is configured such that the rotation axis of the rope sheave is inserted through the shaft hole of the winch body and one surface of the rope sheave is close to the side surface of the winch body, the vicinity of the rope sheave is open, and at least one location in the vicinity of the vicinity of the rope sheave is provided with a wire slack limiting projection that contacts the wire to suppress the bulge when the winding state of the wire bulges outward in the diametrical direction from the circumferential groove of the rope sheave.

[0017] In a fifth aspect of the present application, in the fourth aspect described above, the wire is introduced from the wire guide portion with a U-turn portion formed by folding back in the middle portion as the insertion end, and then expands into a loop shape, passing between the rope sheave and the wire winding roll, and between the rope sheave and the grip roll, and further, the expanded loop portion may slip through the gap between the wire slack limiting projection and the rope sheave and be wrapped around the circumferential groove of the rope sheave in less than one turn.

[0018] As a sixth aspect of the present application, in any one of the second to fifth aspects described above, the wire guide section may be configured to include a pair of vertical axis guide rolls spaced several millimeters to tens of millimeters larger than the wire diameter, a pair of horizontal axis guide rolls spaced vertically by a required distance to correspond to the upper and lower parts of the pair of vertical axis guide rolls, and a guide roll support block that supports them.

[0019] As a seventh aspect of the present application, in any one of the second to fifth aspects described above, the configuration may include, for securing the winch body to the tower column, a tower column support member that abuts against the tower column and extends horizontally, a high-tensile band that is tied to one end of the tower column support member, wraps around the tower column, and is tied to the other end of the tower column support member, a chain member having bolts connected to both ends, through which each bolt is passed through bolt holes drilled at both ends of the tower column support member, and then nuts are screwed onto the bolts and tightened to secure the tower column, and a connecting means that swingably connects the winch body to the tower column support member fixed to the tower column.

[0020] In an eighth aspect of the present application, the servo motor may be a motor with a brake in the second embodiment described above.

[0021] In a ninth aspect of the present application, in the second aspect described above, a clutch may be provided between the rotating shaft of the wire traction mechanism and the output shaft of the reduction gear so that it is always on during winch operation. [Effects of the Invention]

[0022] According to each aspect of the present invention, an overhead transmission line can be pulled by rotationally driving a rope sheave that winds the wire less than one full turn as a wire traction mechanism part of an on-tower winch. In particular, by controlling a servo motor, rotational control and torque control of the rope sheave can be performed, the traction force on the overhead transmission line can be safely and easily controlled, and the end of the overhead transmission line can be connected to an insulator at the tip of an arm part of a transmission tower so that a tension of a predetermined value or less acts thereon. It is possible to provide a traction device for an overhead transmission line and an on-tower winch used therefor.

Brief Description of Drawings

[0023] [Figure 1] FIG. 1 is a schematic view of a traction device for an overhead transmission line and an on-tower winch used therefor according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of an on-tower winch related to a traction device for an overhead transmission line according to an embodiment of the present invention and an on-tower winch according to a first embodiment used therefor. [Figure 3] FIG. 3 is a front view of different operating states of the on-tower winch according to the first embodiment of the present invention. [Figure 4A] It shows an attachment structure of an on-tower winch according to the first embodiment of the present invention to a transmission tower, and is a perspective view showing a connection state of the on-tower winch to a tower column together. [Figure 4B] It shows an attachment structure of an on-tower winch according to the first embodiment of the present invention to a transmission tower, and is a perspective view showing a connection state of the on-tower winch to a tower column together. [Figure 4C] It shows an attachment structure of an on-tower winch according to the first embodiment of the present invention to a transmission tower, and is a perspective view showing a connection state of the on-tower winch to a tower column together. [Figure 4D] It shows an attachment structure of an on-tower winch according to the first embodiment of the present invention to a transmission tower, and is a perspective view showing a connection state of the on-tower winch to a tower column together. [Figure 5]Figure 5 is a perspective view of a prototype example (not a conventional example) that precedes the development of a single-point connector structure as shown in the embodiments of the present invention in Figures 4A to 4D. [Figure 6] Figure 6 is a perspective view of a tower-mounted winch according to a second embodiment of the present invention. [Figure 7] Figure 7 is a front view of the tower winch shown in Figure 6, showing different operating states. [Figure 8] Figure 8 shows the initial steps involved in wrapping the U-turn section of the rope around the rope sheave of the tower winch shown in Figure 6. [Figure 9] Figure 9 shows the procedure immediately before winding the rope around the rope sheave of the tower winch shown in Figure 6, with the U-turn section of the rope folded back and spread out in a circular shape. [Figure 10] Figure 10 shows a traction device for overhead power transmission lines and a tower-mounted winch used therein, relating to the first conventional example. [Figure 11A] This figure shows a second conventional example, a winch for lifting weights. [Figure 11B] This is a longitudinal cross-section of a lifting winch, relating to a second conventional example. [Modes for carrying out the invention]

[0024] Hereinafter, an overhead power transmission line traction device and a tower-mounted winch used therein, according to embodiments of the present invention, will be described with reference to the drawings.

[0025] [Overhead power transmission line traction device according to an embodiment of the present invention] Figure 1 shows a schematic overall view of an overhead power line traction device and a tower-mounted winch used therein according to a first embodiment of the present invention. This overhead power line traction device has a tower-mounted winch 30 to which the winch body 31 is attached to the tower column 4 at a position corresponding to the base of the arm portion 3 to which the overhead power line 1 of the transmission tower 2 is attached.

[0026] The overhead power line traction device according to this embodiment includes a wire traction mechanism 33 that performs traction of the wire 5 by rotating a rope sheave 34 around which the wire 5 is wound in less than one turn, a reduction gear 44 whose output shaft is connected to the rotation shaft 35 of the rope sheave 34, and a servo motor 45 connected to the input shaft of the reduction gear 44, and a tower-top winch 30 in which the winch body 31 is attached to the tower column 4 at a position corresponding to the base of the arm portion 3 of the power transmission tower 2. Furthermore, a servo motor control device 47 that performs rotational and torque control for the servo motor 45, and a battery 46 located near the tower winch 30 are installed to supply power to the servo motor 45 and the servo motor control device 47.The wire 5 that is unfurled from the tower winch 30 is wrapped around multiple pulleys 11 and 12, guided to the front of the arm section 3, and unfurled further.The tip of the wire 5 is connected to the end of the overhead power line 1, which is away from the arm section 3, and the tower winch 30 winds up the wire 5, thereby pulling the end of the overhead power line 1 to the position of the insulator 13 on the arm section 3.

[0027] According to the overhead power line traction device of the present invention, the overhead power line 1 can be towed by rotationally driving a rope sheave 34 that winds up the wire 5 in less than one turn as the wire traction mechanism 33 of the tower winch 30. In particular, rotational control and torque control of the rope sheave 34 can be performed by controlling the servo motor 45, the traction force on the overhead power line 1 can be safely and easily controlled, and the end of the overhead power line 1 can be connected to the insulator 13 at the tip of the arm portion 3 of the transmission tower 2 with a tension of a predetermined value or less.

[0028] [Configuration of the tower-mounted winch 30 according to the first embodiment of the present invention] Figure 2 is a perspective view of a tower-mounted winch used in a traction device for overhead power transmission lines according to an embodiment of the present invention. Figure 3 is a front view of the tower-mounted winch shown in Figure 2 in different operating states.

[0029] As shown in Figures 2 and 3, the tower winch 30 has a structure including a rope sheave 34 around which the wire 5 is wound in less than one turn, a wire guide section 36 that guides the base end of the wire 5 to be wound around the rope sheave 34 and also guides it to be led out after winding, and a roller seesaw section 37 provided between the rope sheave 34 and the wire guide section 36, which includes a bent swing ring 40 whose bent portion is pivotally supported on the winch body 31 and is swingable, a wire winding roll 41 provided on one of the swinging ring ends of the bent swing ring 40, and one or more grip rolls 42 provided on the other swinging ring end of the bent swing ring 40, and has a seesaw structure in which when either the wire winding roll 41 or the grip roll 42 approaches the circumferential surface of the rope sheave 34, the other moves away from the circumferential surface of the rope sheave 34, and when the rope sheave 34 is rotated to pull the wire 5, the wire winding roll 41 moves away from the rope sheave 34 The configuration includes a roller seesaw section 37, which, as it moves away from the rope sheave 34, approaches the rope sheave 34 and rotates in contact with the wire 5, pressing and locking it into the groove on the circumferential surface of the rope sheave 34, and subsequently, when the rope sheave 34 stops rotating, the grip roll 42, which is in contact with the wire 5 and has stopped rotating, maintains the pressed and locked state of the wire 5 to the rope sheave 34; a wire pulling mechanism section 33, which includes a wire pulling member 48 that is tightly fastened to the end of the wire 5 that is led out from the wire guide section 36, causing the rope sheave 34 to rotate in one direction to pull the wire 5, and locking the rope sheave 34 to stop rotating and prevent the wire 5 from being fed out toward the overhead power line; a reduction gear 44, whose output shaft is connected to the rotation shaft 35 of the rope sheave 34; a servo motor 45 connected to the input shaft of the reduction gear 44; and a winch body 31 that supports the wire pulling mechanism section 33, the reduction gear, and the servo motor 45.

[0030] A servo motor 45 is equipped with a brake to lock the rotating shaft 35 when the tower winch 30 is not in operation, thereby preventing the wire 5 from being extended. However, if the reduction ratio of the reducer 44 is set to a sufficiently large value, the static load on the motor rotor will prevent the reducer 44 from free-rotating when not in operation, so a brake on the servo motor 45 is not necessary. Furthermore, a clutch can be provided between the rotating shaft 35 of the wire pulling mechanism 33 and the output shaft of the reducer 44 so that it is always on during winch operation. In this configuration, when the rope sheave 34 needs to pull the wire 5 in the direction of the overhead power line 1, the tower winch 30 is deactivated and the clutch is turned off, allowing the rope sheave 34 to rotate freely and pull the wire 5 in the direction of the overhead power line 1.

[0031] This tower-mounted winch 30 requires a battery 46 located near the tower-mounted winch 30 at the same height, and a servo motor control device 47 located near the tower-mounted winch 30 at the same height, in order to supply power to and control the servo motor 45. The servo motor control device 47 can control the rotational speed and torque of the rope sheave 34.

[0032] In this tower-mounted winch 30, with respect to the rope sheave 34, the rotation shaft 35 of the rope sheave 34 is inserted through the shaft hole of the winch body 31, and one surface of the rope sheave 34 is close to the side surface of the winch body 31, and the area around the rope sheave 34 is surrounded by a stepped surface 31c provided on the side surface of the winch body 31, except for the roller seesaw part 37, with a separation distance of, for example, 5 mm, and the other (front) surface of the rope sheave 34 is covered by a rope sheave cover 38 that is detachably fixed to the winch body 31. Regarding the winding of the wire 5 onto the rope sheave 34, the base end of the wire 5 is introduced between the wire winding roll 41 and the rope sheave 34 through the wire guide section 36, and the wire 5 is then fed in, so that it is wound onto the rope sheave 34 in less than one turn along the gap between the circumferential surface of the rope sheave 34 and the stepped surface 31c provided on the side of the winch body 31.

[0033] [Wire pulling mechanism 33] The wire pulling mechanism 33 includes a rope sheave 34 whose center is fixed to a rotating shaft 35 whose rotating shaft 35 is supported in an axial hole (not indicated) of the winch body 31, a wire guide section 36 provided at a required distance from one side of the wire pulling in and unwinding side from the rope sheave housing space 32, a roller seesaw section 37 provided between the rope sheave 34 and the wire guide section 36, and a safety rope sheave cover 38 that closes the open side of the rope sheave 34.

[0034] The rope sheave 34 is housed in a rope sheave housing space 32, which is a recess provided on one outer surface of the winch body 31, and the rotating shaft 35 is pivotally supported in a shaft hole (not indicated) of the winch body 31, with the opposite end of the rotating shaft 35 of the winch body 31 connected to the output shaft of the reduction gear 44.

[0035] The wire guide section 36 includes a pair of vertical guide rolls 36a spaced several millimeters to tens of millimeters apart from the wire diameter, a pair of horizontal guide rolls 36b spaced vertically by a required distance to correspond to the upper and lower parts of the pair of vertical guide rolls 36a, and a guide roll support block 36c that supports the pair of vertical guide rolls 36a and the pair of horizontal guide rolls 36b. The guide roll support block 36c may be part of the winch body 31.

[0036] The roller seesaw section 37 includes a bent oscillating ring 40 provided between the rope sheave 34 and the wire guide section 36, with an intermediate bent section pivotally supported by a pivot shaft 39 protruding from the winch body 31; a wire winding roll 41 provided at one of the oscillating ends of the bent oscillating ring 40; and one or more grip rolls 42 provided at the other oscillating end of the ring. In the illustration, four grip rolls 42 are provided.

[0037] The state shown in Figure 2 is when the wire winding roll 41 is close to the rope sheave 34 and the grip roll 42 is separated from the rope sheave 34, while the state shown in Figure 3 is when the wire winding roll 41 is separated from the rope sheave 34 and the grip roll 42 is close to the rope sheave 34. In this way, the roller seesaw section 37 is configured such that when either the wire winding roll 41 or the grip roll 42 approaches the circumferential surface of the rope sheave 34, the other moves away from the circumferential surface of the rope sheave 34, because the bending swing ring 40 can swing about the pivot axis 39 as the center of rotation. When the grip roll 42 is close to the rope sheave 34, the wire 5 is pressed by the grip roll 42 and fitted into the circumferential groove of the rope sheave 34 so that it cannot move relative to it and can move together with the rotation of the rope sheave 34.

[0038] [How to attach wire 5] When the wire 5 is guided above the tower winch 30 and connected to the overhead power transmission line 1, it is passed from the outside upper part of the wire guide section 36 between a pair of horizontal guide rolls 36b, then sequentially between a pair of vertical guide rolls 36a, then wound around the inside of the wire winding roll 41, wound around the V-shaped circumferential groove from the upper side of the outer surface of the rope sheave 34 in less than one turn, passed inside the four grip rolls 42 on the lower side of the outer surface of the rope sheave 34, passed between a pair of vertical guide rolls 36a of the wire guide section 36, then between a pair of horizontal guide rolls 36b, and then passed downwards by gravity, where a wire-preventing locking member 48 is tightened at the end of the hanging wire.

[0039] When the wire 5 is connected to the overhead power line 1, tension is generated in the wire 5. This causes the wire winding roll 41 to move away from the rope sheave 34, and the grip roll 42 to move closer to the rope sheave 34 and press against the wire 5, so that the wire 5 is locked in the V-shaped groove of the rope sheave 34. This locked state of the wire 5 has the function of preventing the rope 5 from being paid out in the direction of the overhead power line 1 when the motor is not operating and the brake is applied, provided that the reduction gear 44 or servo motor 45 has a brake. In addition, when the motor is operating and the brake is not applied, the rope sheave 34 is driven to rotate counterclockwise, and the rope sheave 34 has the function of winding up the wire 5.

[0040] [Relationship between the outer diameter of the rope sheave 34, the inner diameter of the rope sheave housing space 32, the diameter of the wire 5, and the stepped surface 31c] The wire 5 is, for example, 10-15 mm in diameter and is wound in less than one turn around the V-shaped groove on the circumferential surface of the rope sheave 34. The wire 5 is wound around the rope sheave 34 so that it is, for example, 2-3 mm larger than the outer diameter of the rope sheave 34 (protrusion dimension 2-3 mm). The gap between the outer diameter of the rope sheave 34 and the stepped surface 31c that forms the rope sheave housing space 32 is, for example, 5 mm. This gap is such that even if the portion of the wire 5 wound in less than one turn bulges outward when not being pulled, the wire 5 cannot escape from the recess on the circumferential surface of the rope sheave 34. Furthermore, since the gap between the outer diameter of the rope sheave 34 and the stepped surface 31c forming the rope sheave housing space 32 is set to, for example, 5 mm, the gap between the diameter of the housing side of the rope sheave housing space 32 and the outer diameter of the rope sheave 34 can be made larger than the diameter of the wire 5. This serves to prevent the rope from coming off the rope sheave 34 even if the wire 5, which is wound around the rope sheave 34 in less than one turn, loosens when not being pulled. Providing the rope sheave cover 38 allows the rotating shaft 35 to be inserted through the shaft hole (not shown) provided in the winch body 31 to house the rope sheave 34 in the rope sheave housing space 32, and then the rope sheave housing space 32 to be closed. The rope sheave cover 38 has the function of preventing the worker's hands and fingers from getting caught in the wire 5.

[0041] [Function of the wire detachment prevention locking member 48] If, by any chance, an electrical error occurs that causes the motor to stop and the motor's output shaft to rotate freely (the brake is not engaged), even if the wire 5 is locked to the rope sheave 34 by the grip roll 42, the rope sheave 34 will rotate freely clockwise, potentially causing the wire 5 to come loose. To prevent this, the wire-loosening prevention locking member 48, which is tightly attached to the wire 5, cannot pass between the pair of horizontal axis guide rolls 36b of the wire guide section 36, thereby preventing the wire 5 from coming loose from the tower winch 30.

[0042] [Driven by the tower-mounted winch 30] With the wire 5 connected to the overhead power transmission line 1, the servo motor 45 is driven via the servo motor control device 47, causing the rope sheave 34 to rotate counterclockwise in Figure 3, thereby allowing the wire 5 to be pulled in. When the servo motor 45 reaches a predetermined torque, the servo motor control device 47 can instantly stop the servo motor 45 from driving and the brake is activated, so the rope sheave 34 can be instantly stopped from rotating, thereby allowing the pulling force of the wire 5 to be set to the required value by automatic control.

[0043] [Differences between conventional ground winches and the tower winch of the present invention] To install a winch on top of transmission tower 2, the winch needs to be lightweight. Ground winches have a multi-winding drum for the wire and a heavy induction motor, making them unsuitable for lifting and installing on top of transmission towers. In contrast, the tower-top winch 30 has a wire pulling mechanism 33 that can wind the wire 5 around the rope sheave 34 in less than one turn and a lightweight servo motor 45, so the total weight of the winch is significantly lighter than conventional winches, making it suitable for lifting and installing on top of transmission tower 2. Therefore, the installation work of the tower-top winch 30 can be easily performed.

[0044] [Relationship between traction control of overhead power lines and the characteristics of induction motors and servo motors] Induction motors do not have permanent magnets in the rotor; they rotate using electromagnets in the stator, and only the speed can be adjusted. Because the rotor has a large inertia and the rotation start and stop movements are slow, control is complex, and considerable skill is required to rotate the winding drum and wind up and pull the wire 5 using the lever operation. In contrast, servo motors are equipped with encoders and perform control by feeding back the rotational position and speed of the motor shaft. They have a small inertia, move quickly, quickly and accurately, and can control position / speed / torque, providing continuous repetitive operation and high reliability. Using a servo motor instead of a conventional induction motor eliminates the need for skill in pulling the wire 5, and allows for quick and easy pulling of overhead power lines into the arms of transmission towers.

[0045] The tower winch 30 used in this invention is composed of a wire pulling mechanism 33, a reduction gear 44, and a servo motor 45. The wire pulling mechanism 33 is a significantly lighter component that replaces the winding drum of a conventional ground winch, and the servo motor 45 is a lighter component that replaces the induction motor of a conventional ground winch. As a result, the total weight of the winch is significantly reduced, making it easy to lift and install it on top of the power transmission tower 2. The tower winch 30 of this invention can rise on its own when the wire 5 is unwound and the wire 5 is wound up by connecting the unwound end of the wire 5 to the top of the power transmission tower 2. After installing the tower winch 30 on top of the power transmission tower 2, the wire 5 can be unwound and connected to a battery 46 and a servo motor control device 47, and the battery 46 and servo motor control device 47 can be lifted to the same height as the tower winch 30.

[0046] The power supply means for the servo motor 45 used in this embodiment of the present invention is a large-capacity secondary battery (for example, a lithium battery), which is lighter and smaller than the generators used for conventional ground winches, is easy to lift and install at the same height as the tower winch 30, and because the distance between the tower winch 30 and the secondary battery is short, the wiring for power supply is short and the wiring work is easy. Alternatively, a generator may be installed on the ground instead of the battery 46.

[0047] According to the present invention, since the battery 46 and the servo motor control device 47 are located near the same height as the tower-mounted winch 30, the control cord can be shortened, and the problems of the prior art can be solved.

[0048] [Configuration for attaching the tower winch 30 to the tower column 4] As shown in Figure 1, the detailed configuration for attaching the tower-top winch 30 to the tower column 4 is shown in Figures 4A-4D. First, to support the tower-top winch 30 in a suspended state, the upper part of the winch body 31 is lifted by a single lifting device 67 suspended from the upper arm portion 3 of the tower-top winch 30 (see Figure 1). Although details of the lifting device 67 are not shown, it is desirable that it includes, for example, a wire and a mechanism that allows for adjustable wire length. Furthermore, in order to ensure that the bottom surface of the winch body 31 coincides with the horizontal plane, it is desirable to suspend at least three lifting devices 67 from the upper arm portion 3 of the tower-top winch 30 and lift the upper part of the winch body.

[0049] Next, the winch body 31 is attached to the tower column 4. The attachment configuration consists of a tower column support member 51 made of a channel profile with a curved section 51a formed in the middle of a pair of parallel surfaces, with the curved section 51a abutting against the tower column 4 and extending horizontally; a high-tensile band 52 that is tied to one end of the tower column support member 51, wraps around the tower column 4, and is tied to the other end of the tower column support member 51; a chain member 53 with bolts 54 connected to both ends, through which each bolt 54 is passed through bolt holes drilled at both ends of the tower column support member 51 when the tower column 4 is wrapped around it, and then nuts 55 are screwed onto the bolts 54 to tighten and secure the tower column 4; and the tower column support member 51 and the perforated projection 31b of the base portion 31a of the winch body 31 are connected at one point using a chain-structured connecting part 56. The base portion 31a of the winch body 31 is preferably made of a channel profile. The connecting portion 56 of the chain structure includes, for example, two shackles and one ring, and connects a perforated projection 51b provided on the tower column support member 51 with a perforated projection 31b provided on the lower side surface of the base portion 31a of the winch body 31.

[0050] The high-tensile band 52 is a lashing belt for preventing slippage, and it fastens the tower column 4 before fastening it with the chain member 53.

[0051] The column support member 51 has a pair of recesses located in the middle, one above the other, which allows it to stably contact the column 4. It is first secured to the column 4 with a high-tension band 52, and then the chain member 53 is wrapped around it and secured to the bolt 54 by tightening a nut 55. The chain member 53 provides a double layer of security for the column support member 51 to the column 4.

[0052] The connecting section 56 is a chain-like structure that connects the column support member 51 fixed to the column 4 and the winch body 31 at one point, and is a component that has a connecting function that allows for relative displacement. It is sufficient that the connecting elements provided on the column support member 51 and the connecting elements provided on the winch body 31 are connected in such a way that the column support member 51 and the winch body 31 have a degree of freedom that allows for relative displacement. For example, the opposing pair of connecting elements may be plates with bolt holes, and the bolt holes may be aligned and connected with a shackle, or connected with bolts and nuts, so that the winch body 31 can be raised and lowered relative to the column 4. Alternatively, the opposing pair of connecting elements may be plates with bolt holes, and the two bolt holes may be spaced apart and connected in a chain-like manner with one or more oval rings.

[0053] In this way, by providing a chain-like connecting section 56 that connects the base 31a of the winch body 31 to the tower support member 51 fixed to the tower column 4 at one point, bending stress does not occur at the connection between the tower support member 51 and the base 31a of the winch body 31 when the tower winch 30 pulls the overhead power transmission line 1, and tensile stress is generated instead, thereby increasing the safety of the connection section.

[0054] According to the overhead power line traction device of this embodiment, the tower winch 30 includes a wire traction mechanism 33, a reduction gear 44, and a servo motor 45. The wire traction mechanism 33 includes a rope sheave 34, a wire guide section 36, a roller seesaw section 37 including a bending and oscillating ring 40, a wire winding roll 41, and a grip roll 42. The wire is introduced from the wire guide section with a U-turn section formed by folding the wire in the middle as the insertion end, then expanded into a loop and wrapped around the circumferential groove of the rope sheave in less than one turn. This makes it easy to wind the wire around the rope sheave 34 in less than one turn, and the servo motor 45 rotates the rope sheave 34, allowing control of the traction force of the overhead power line.

[0055] On the other hand, as shown in Figures 4A-4D, the reason why the tower column support member 51 and the winch body 31 are connected by a single connecting section 56 instead of two will be explained by comparing it with Figure 5, which shows two connecting sections. Figure 5 is a prototype example (unknown) in which the tower column support member 51 and the winch body 31 are connected by two connecting devices 56a and 56b, rather than a conventional example. What was found in this prototype example is that when the upper part of the winch body 31 is connected to the arm of the power transmission tower with a lifting device 67 and the tower-top winch 30 is lifted, the side with the reduction gear 44 and servo motor 45 is on the lower side, resulting in a twisted posture relative to the horizontal plane of the lower surface of the base section 31a. As a result, one connecting section 66a is in an effective connected state, while the other connecting section 66b is in a connected state with play. As a result, it was determined that it is sufficient to provide only one connecting section 56. This does not mean that the case in which the connecting portion 56 is provided in two locations is outside the scope of the rights.

[0056] According to the overhead power line traction device and tower winch used therein of this embodiment, the traction force of the overhead power line 1 can be controlled by rotating a rope sheave 34, which winds the wire 5 in less than one turn, with a servo motor 45 as the wire traction mechanism 33 of the tower winch 30, and the end of the overhead power line 1 can be connected to the insulator 13 at the tip of the arm portion 3 of the transmission tower 2 with a tension of a predetermined value or less.

[0057] According to the tower winch of the first embodiment of the present invention, overhead power lines can be pulled by rotating a rope sheave that winds up the wire in less than one turn as the wire pulling mechanism, and in particular, rotational control and torque control of the rope sheave can be performed by controlling a servo motor, so that the pulling force on the overhead power lines can be controlled safely and easily.

[0058] [Configuration of the tower-mounted winch 30A according to the second embodiment of the present invention] Figure 6 shows a tower-mounted winch 30A according to a second embodiment of the present invention. The tower winch 30A has a structure that includes a rope sheave 34 around which the wire 5 is wound in less than one turn, a wire guide section 36 that guides the base end of the wire 5 to be wound around the rope sheave 34 and also guides it to be led out after winding, and a roller seesaw section 37 provided between the rope sheave 34 and the wire guide section 36, and includes a bent swing ring 40 whose bent portion is pivotally supported on the winch body 31 and is swingable, a wire winding roll 41 provided on one of the swinging ring ends of the bent swing ring 40, and one or more grip rolls 42 provided on the other swinging ring end of the bent swing ring 40, and has a seesaw structure in which when either the wire winding roll 41 or the grip roll 42 approaches the circumferential surface of the rope sheave 34, the other moves away from the circumferential surface of the rope sheave 34, and when the rope sheave 34 is rotated to pull the wire 5, the wire winding roll 41 moves away from the rope sheave 34. The configuration includes a roller seesaw section 37 in which a grip roll 42 approaches the rope sheave 34, contacts and rotates the wire 5, and presses and locks it into the groove on the circumferential surface of the rope sheave 34, and subsequently, when the rope sheave 34 stops rotating, the grip roll 42, which is in contact with the wire 5 and has stopped rotating, maintains the pressed and locked state of the wire 5 to the rope sheave 34; a wire pulling mechanism section 33 which includes a wire pulling member 48 that is tightly connected to the end of the wire 5 that is led out from the wire guide section 36, causing the rope sheave 34 to rotate in one direction to pull the wire 5, and also stopping the rotation of the rope sheave 34 and locking the wire 5 so that it does not unwind towards the overhead power line; a reduction gear 44 whose output shaft is connected to the rotation shaft 35 of the rope sheave 34; a servo motor 45 connected to the input shaft of the reduction gear 44; and a winch body 31 that supports the wire pulling mechanism section 33, the reduction gear 44, and the servo motor 45. This configuration is identical to the tower-mounted winch 30 according to the first embodiment.

[0059] Regarding this tower-mounted winch 30A, with respect to the rope sheave 34, the rotation shaft 35 of the rope sheave 34 is inserted through the shaft hole of the winch body 31, and one surface of the rope sheave 34 is close to the side surface of the winch body 31. The vicinity of the rope sheave 34 is open, and at least one location in the vicinity of the vicinity of the rope sheave is provided with a wire slack limiting projection 49 that contacts the wire 5 to suppress the bulge when the winding state of the wire 5 bulges outward in the diametrical direction from the circumferential groove of the rope sheave 34. This configuration is a component that differs from the tower-mounted winch 30 according to the first embodiment.

[0060] [Wire pulling mechanism 33] The wire pulling mechanism 33 has a structure that includes a rope sheave 34 whose rotating shaft 35, located in the center of the winch body 31, is pivotally supported by the winch body 31; a wire guide section 36 provided at a required distance from one open side of the rope sheave housing space 32; a bent swing ring 40 provided between the rope sheave 34 and the wire guide section 36, the bent portion of which is pivotally supported by a pivot shaft 39 provided on the winch body 31 and is swingable; a wire winding roll 41 provided at one of the swinging ring ends of the bent swing ring 40; and one or more grip rolls 42 provided at the other swinging ring end of the bent swing ring 40, and a roller seesaw section 37 in which, when either the wire winding roll 41 or the grip roll 42 approaches the circumferential surface of the rope sheave 34, the other moves away from the circumferential surface of the rope sheave 34.

[0061] The rope sheave 34 is supported by the rotating shaft 35 of the winch body 31 in the shaft hole (not indicated) of the winch body 31, and the opposite end of the rotating shaft 35 of the winch body 31 is connected to the output shaft of the reduction gear 44.

[0062] The wire guide section 36 includes a pair of vertical guide rolls 36a spaced several millimeters to tens of millimeters apart from the wire diameter, a pair of horizontal guide rolls 36b spaced vertically by a required distance to correspond to the upper and lower parts of the pair of vertical guide rolls 36a, and a guide roll support block 36c that supports the pair of vertical guide rolls 36a and the pair of horizontal guide rolls 36b. The guide roll support block 36c may be part of the winch body 31.

[0063] The roller seesaw section 37 includes a bent oscillating ring 40 provided between the rope sheave 34 and the wire guide section 36, with an intermediate bent section pivotally supported by a pivot shaft 39 protruding from the winch body 31; a wire winding roll 41 provided at one of the oscillating ends of the bent oscillating ring 40; and one or more grip rolls 42 provided at the other oscillating end of the ring. In the illustration, four grip rolls 42 are provided.

[0064] The state shown in Figure 6 is when the wire winding roll 41 is close to the rope sheave 34 and the grip roll 42 is separated from the rope sheave 34, while the state shown in Figure 7 is when the wire winding roll 41 is separated from the rope sheave 34 and the grip roll 42 is close to the rope sheave 34. Thus, the roller seesaw section 37 is configured such that when either the wire winding roll 41 or the grip roll 42 approaches the circumferential surface of the rope sheave 34, the other moves away from the circumferential surface of the rope sheave 34, because the bending swing ring 40 can swing about the pivot axis 39 as the center of rotation. When the grip roll 42 is close to the rope sheave 34, the wire 5 is pressed by the grip roll 42 and fitted into the circumferential groove of the rope sheave 34 so that it cannot move relative to it and can move together with the rotation of the rope sheave 34.

[0065] [Wrapping wire 5 onto rope sheave 34] The rope sheave 34 is equipped with wire slack-restricting protrusions 49 that contact the wire 5 at least at one location (five locations in the diagram) to suppress the bulge when the winding state of the wire 5 bulges outward in the diametrical direction from the circumferential groove of the rope sheave 34, and the gap between the wire slack-restricting protrusions 49 and the rope sheave 34 is set to be larger than the diameter of the wire 5 (for example, 1-3 mm larger). This allows the wire 5 to be wound along the rope sheave 34.

[0066] The wire slack limiting projection 49 only needs to be provided at least once at the position where the wire 5 bulges most diametrically outward. The wire slack limiting projection 49 may be configured to allow a slide block to be screwed in so that the projection dimension can be adjusted. The wire slack limiting projection 49 may also be configured to be pushed in and locked with a single touch.

[0067] As shown in Figure 8, the wire 5 is introduced from the wire guide section 36 with a U-turn section 5a, which is folded back in the middle, as the insertion end, and is then pulled in to the end of the rope sheave 34. Then, as shown in Figure 9, it is spread out so that it passes between the rope sheave 34 and the wire winding roll 41, and between the rope sheave 34 and the grip roll 42, and the U-turn section 5a is inflated to form a ring-shaped section 5b that is slightly larger than the outer diameter of the rope sheave 34. Furthermore, the inflated ring-shaped section is pushed in so that it slips through the gap between the wire slack limiting projection 49 and the rope sheave 34, so that it is wrapped around the circumferential groove of the rope sheave 34 in less than one turn.

[0068] The wire guide section 36 includes a pair of vertical guide rolls 36a spaced several millimeters to tens of millimeters apart from the wire diameter 5, a pair of horizontal guide rolls 36b spaced vertically by a required distance to correspond to the upper and lower parts of the pair of vertical guide rolls 36a, and a guide roll support block 36c that supports them.

[0069] A servo motor 45 is equipped with a brake to lock the rotating shaft 35 when the tower winch 30A is not in operation, thereby preventing the wire 5 from being extended. However, if the reduction ratio of the reducer 44 is set to a sufficiently large value, the static load on the motor rotor will prevent the reducer 44 from free-rotating when not in operation, so a brake on the servo motor 45 is not necessary. Furthermore, a clutch can be provided between the rotating shaft 35 of the wire pulling mechanism 33 and the output shaft of the reducer 44 so that it is always on during winch operation. In this configuration, when the rope sheave 34 needs to pull the wire 5 in the direction of the overhead power line 1, the tower winch 30A is deactivated and the clutch is turned off, allowing the rope sheave 34 to rotate freely and pull the wire 5 in the direction of the overhead power line 1.

[0070] [Configuration for attaching the tower winch 30A to the tower column 4] The explanation is omitted as it is the same configuration for attaching the tower winch 30 to the tower column 4.

[0071] According to the tower winch 30A of the second embodiment of the present invention, the wire 5 can be easily attached and the work time reduced by inserting the U-turn portion formed by folding the middle part of the wire 5 and further expanding it into a loop to wrap around the rope sheave 34. The wire 5 can also be secured to the wire 5 with a wire detachment prevention locking member 48 before wrapping the wire 5 around the rope sheave 34. Furthermore, the servo motor control device 47 can control the rotation and torque of the rope sheave 34, allowing for safe and easy control of the pulling force on the overhead power transmission line 1. [Explanation of symbols]

[0072] 1… Overhead power transmission lines, 2...Transmission towers, 3...Arm section, 4... Tower pillar, 5... Wire, 6... Ground winch, 7... Generator, 8... Weight, 9…Winch control device, 10, 11, 12...golden wheel, 13... Insulator, 30, 30A... Tower winch, 31...Winch body, 31a...Base section 31b…Protrusion with hole, 31c...Step surface, 32... Rope sheave storage space, 33...Wire pulling mechanism section, 34... Rope sheave, 35... axis of rotation, 36... Wire guide section, 36a... Vertical axis guide roll, 36b... Horizontal axis guide roll, 36c... Guide roll support block, 37... Roller seesaw section, 38... Rope sheave cover, 39... Pivot axis, 40... Flexible oscillating ring, 41... Wire winding roll, 42... Grip Roll, 44...Reducer, 45... Servo motor, 46... Battery, 47…Control device for servo motors, 48… Locking component to prevent wire from coming loose, 51... Tower column support material, 51a... Bay area, 51b…Protrusion with hole, 52... High-tension band, 53... Chain members, 54... Volts, 55... Nut, 56...Connection part, 60... Lifting winch, 61...Winch body, 62... Induction motor, 63... Rope sheave, 64... Flexible oscillating ring, 65... Wire winding roll, 66... ​​Grip Roll, 67...Hanging tool.

Claims

1. The tower-mounted winch includes a wire traction mechanism that rotates a rope sheave around which the wire is wound in less than one turn to pull the wire, a reduction gear whose output shaft is connected to the rotation axis of the rope sheave, and a servo motor connected to the input shaft of the reduction gear, the winch body being attached to the tower column at a position corresponding to the base of the arm portion of the power transmission tower, and further includes a servo motor control device that performs rotational and torque control of the servo motor, and a battery or generator provided near the tower-mounted winch and / or on the ground to supply power to the servo motor and the servo motor control device. The wire, which is unfurled from the tower-top winch, is wound around a pulley and guided to the tip of the arm, and is further unfurled until the tip of the wire is connected to the end of the overhead power line away from the arm. The wire is then wound up from the tower-top winch to pull the end of the overhead power line to the position of the insulator provided on the arm. A traction device for overhead power transmission lines characterized by the following:

2. A tower-mounted winch used in a traction device for overhead power transmission lines according to claim 1, A rope sheave in which the wire is wrapped around in less than one turn, A wire guide section that guides the base end of the wire so that it can be wrapped around the rope sheave and also guides it to be led out after it has been wrapped, A structure including a roller seesaw portion provided between the rope sheave and the wire guide portion, It includes a bendable swing ring whose bend is pivotally supported on the winch body and is swingable, a wire winding roll provided at one of the swinging ends of the bendable swing ring, and one or more grip rolls provided at the other swinging end of the bendable swing ring, The wire winding roll and the grip roll are in a seesaw structure in which, when one approaches the circumferential surface of the rope sheave, the other moves away from the circumferential surface of the rope sheave. The roller seesaw section is configured such that when the rope sheave is rotated to pull the wire, the wire winding roll moves away from the rope sheave and the grip roll approaches the rope sheave, contacting and rotating with the wire and pressing it into the groove on the circumferential surface of the rope sheave, and subsequently, when the rope sheave stops rotating, the grip roll, which is in contact with the wire and has stopped rotating, holds the wire in the pressed-lock state of the rope sheave. Furthermore, the wire pulling mechanism includes a wire pulling member that is tightly fastened to the end of the wire after it is led out from the wire guide, the rope sheave rotates in one direction to pull the wire, and locks the rope sheave to stop rotating and prevent the wire from being unfurled toward the overhead power line, A reduction gear, in which the output shaft is connected to the rotating shaft of the rope sheave, A servo motor connected to the input shaft of the aforementioned reduction gear, The wire traction mechanism, the reduction gear, and the winch body supporting the servo motor A tower-mounted winch characterized by having the following features.

3. With respect to the rope sheave, the rotation axis of the rope sheave is inserted through the shaft hole of the winch body, one surface of the rope sheave is close to the side surface of the winch body, and the vicinity of the rope sheave, excluding the roller seesaw portion, is surrounded by a stepped surface provided on the side surface of the winch body. The tower winch according to claim 2, wherein, with respect to winding the wire onto the rope sheave, the base end of the wire is introduced between the wire winding roll and the rope sheave through the wire guide and the wire is fed in, thereby winding it onto the rope sheave along the gap between the circumferential surface of the rope sheave and the stepped surface provided on the side surface of the winch body.

4. The tower winch according to claim 2, wherein the rope sheave is configured such that the rotation axis of the rope sheave is inserted through the shaft hole of the winch body and one surface of the rope sheave is close to the side surface of the winch body, the vicinity of the rope sheave is open, and a wire slack limiting projection is provided at least one place in the vicinity of the vicinity of the rope sheave that contacts the wire to suppress the bulge when the winding state of the wire bulges outward in the diameter direction from the circumferential groove of the rope sheave.

5. The tower winch according to claim 4, wherein the wire is introduced from the wire guide section with a U-turn section formed by folding back in the middle as the insertion end, and then expands into a loop shape, passing between the rope sheave and the wire winding roll, and between the rope sheave and the grip roll, and further the expanded loop portion slips through the gap between the wire slack limiting projection and the rope sheave and is wrapped around the circumferential groove of the rope sheave in less than one turn.

6. The tower winch according to any one of claims 2-5, wherein the wire guide section includes a pair of vertical axis guide rolls spaced several mm to tens of mm apart from the wire diameter, a pair of horizontal axis guide rolls spaced vertically by a required distance to correspond to the upper and lower parts of the pair of vertical axis guide rolls, and a guide roll support block that supports them.

7. A tower winch according to any one of claims 2-5, comprising: a tower column support member that abuts against the tower column and extends horizontally for securing the winch body to the tower column; a high-tensile band that is tied to one end of the tower column support member, wraps around the tower column, and is tied to the other end of the tower column support member; a chain member having bolts connected to both ends, through which each bolt is passed through bolt holes drilled at both ends of the tower column support member, and then nuts are screwed onto the bolts and tightened to secure the tower column; and a connecting means for pivotably connecting the winch body to the tower column support member fixed to the tower column.

8. The tower-mounted winch according to claim 2, wherein the servo motor is a motor with a brake.

9. The tower-mounted winch according to claim 2, wherein a clutch is provided between the rotating shaft of the wire traction mechanism and the output shaft of the reduction gear so that the clutch is always engaged when the winch is in operation.

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