KR102197105B1 - Deflection prevention device for processed transmission line - Google Patents

Abstract

Provided is a deflection prevention device of an overhead transmission line which can prevent interference between parts. The deflection prevention device of an overhead transmission line comprises: a sensing unit in which an arm is installed to extend from a fixing ring member installed on an electric pole and when a transmission cable passing through a support ring installed at an end of an insulator installed to extend downward from the arm is deflected in a downward direction by a set value or more, a deflection signal is transmitted by detecting the same; a compensation driving unit returning the transmission cable to an original position while providing tension to the transmission cable while pulling a portion of the transmission cable upward or downward when the deflection signal transmitted from the sensing unit is received; a position fixing unit in which when the transmission cable is returned to an original state while the tension is provided to the transmission cable by operation of the compensation driving unit, the tension provided from the compensation driving unit is maintained to be provided to the transmission cable even if the compensation driving unit is shut off by restraining a power supply; and an interlocking unit which prevents interference between parts by driving the compensation driving unit and the position fixing unit at the same time.

Description

Deflection prevention device for overhead transmission line {DEFLECTION PREVENTION DEVICE FOR PROCESSED TRANSMISSION LINE}

The present invention relates to an apparatus for preventing sagging of an overhead transmission line, and more specifically, it is possible to detect in real time whether a transmission cable is sagging, and when it sags above a set value of a transmission cable, a part of the transmission cable is raised or lowered. By providing a tensile force to the transmission cable, it is possible to prevent sagging beyond the set value of the transmission cable, and after the compensation operation that provides the tensile force to the transmission cable is in progress, it prevents additional sagging of the transmission cable while maintaining the state that the tensile force is provided to the transmission cable. The present invention relates to an apparatus for preventing deflection of an overhead power transmission line capable of preventing interference between components while simultaneously performing an operation providing a tensile force and an operation maintaining the tensile force.

In general, power is transmitted from a power plant to a substation through a transmission line using a transmission tower, etc., and then supplied to a general customer (home) along the distribution line of the electric pole after undergoing several stages of transformation.

At this time, the distribution line installed in the electric pole needed to secure materials and good grounding in the distribution line in order to protect equipment by abnormal voltages such as lightning and surge and to prevent various electric disasters due to short circuit. It has the function of protecting humans and power facilities from electric power or lightning.

Conventional transmission and distribution lines are installed underground or in the air, and when installed in the air, they are processed and installed using supports such as steel towers or electric poles.

Among the supports, the transmission and distribution lines installed on the pole are three-phase, four-wire, three-phase, three-wire, or single-phase two-wire, and are mainly installed at the top and bottom of the pole with one pole on one pole.In this case, it is limited to two lines. , In the case of a transmission line using a transmission tower, three or more lines may be installed.

In this way, in the case of using an existing overhead cable, the number of lines that can be installed in one pole is less than 2 lines depending on factors such as the installation space of the pole and the length of the pole, as the wire path is composed of one set of 3 to 4 wires per line. Is limited to.

Here, the transmission and distribution wires of each electric pole on the customer's side are wired so as to have a tight tension on the upper support (wangeum) that runs horizontally to the top of the electric pole, and the jumper wires are upward or downward through a line post insulator fixed to the upper support. Will be connected.

However, these transmission and distribution lines were caused to sag after a certain period of time due to the influence of their own load and outside air, which greatly hindered the urban landscape, as well as being easily shaken by external climatic factors such as wind, resulting in short circuit accidents and power failure due to friction. There is a problem that causes an accident.

The background technology of the present invention is disclosed in Korean Registered Patent Publication No. 10-1129397 (announced on March 27, 2012, title of invention: device for preventing sagging of high-voltage cables).

The device for preventing sagging of high-voltage cables according to the prior art, when connecting the supporting box and the connecting rod or connecting the connecting rod and the foundation block, must connect the connecting rod to the supporting box or the foundation block by a plurality of fastening members, and connect the holder member and the supporting box. Even when a plurality of fastening members are required, there is a problem in that it is difficult to reduce the time and cost required for the installation work or replacement work of the sagging prevention device.

Therefore, there is a need to improve this.

The present invention can detect the sag of the transmission cable in real time, and if it sags above the set value of the transmission cable, it is possible to prevent sagging beyond the set value of the transmission cable by providing tensile force to the transmission cable while raising or lowering a part of the transmission cable. In addition, after the compensation operation that provides tensile force to the transmission cable is in progress, it is possible to prevent additional sagging of the transmission cable while maintaining the state where the tensile force is provided to the transmission cable, and the operation to provide tension and the operation to maintain the tension are performed. It is an object of the present invention to provide a device for preventing sagging of an overhead transmission line that can prevent interference between parts while proceeding simultaneously.

In the present invention, when the transmission cable passing through the support ring installed at the end of the insulator installed so as to extend from the fixing ring member installed on the electric pole is installed to extend downward from the electric pole, it is A sensing unit that senses and transmits a sag signal; A compensation driving unit for returning the transmission cable to its original position while providing tension to the transmission cable while pulling a portion of the transmission cable upward or downward when the sag signal transmitted from the sensing unit is received; When the power transmission cable is returned to its original state while tension is provided to the transmission cable by the operation of the compensation driving unit, the position fixing unit maintains the tension provided from the compensation driving unit to be provided to the transmission cable even if the compensation driving unit is shut off by restraining the power supply ; And an interlocking unit that prevents interference between components by driving the compensation driving unit and the position fixing unit at the same time.

In addition, the sensing unit of the present invention, a pressure block having a through hole formed to pass through the transmission cable extending through the support ring; A first sensor installed at one end of the through-hole part, sensing a load generated when the transmission cable sags downward, and transmitting a sag signal when the load of the transmission cable exceeds a set value; A second sensor installed in the center of the through hole, sensing a load generated when the transmission cable sags downward, and transmitting a sag signal when the load of the transmission cable exceeds a set value; And a third sensor installed at the other end of the through-hole part, sensing a load generated as the transmission cable sags downward, and transmitting a sag signal when the load of the transmission cable exceeds a set value, wherein the first sensor to It is characterized in that it is possible to determine a section in which sagging of the transmission cable occurs according to the sag signal transmitted from the third sensor.

In addition, the compensation driving unit of the present invention, the mounting base extending in the lateral direction from the fixing ring member; A pressing shaft installed to be elevating in a vertical direction through the mounting table, a rack gear formed on a circumferential surface, and the pressing block installed at a lower end; A pinion member rotatably installed on the mounting table so as to be gear-connected to the rack gear; A motor providing power to rotate the pinion member in a forward or reverse direction; And it characterized in that it comprises a power transmission unit for transmitting the power of the motor to the pinion member.

In addition, the power transmission unit of the present invention, a first gear installed on the output shaft of the motor; A flow shaft slidably installed on the mounting table so as to move forward or backward toward the output shaft of the motor; A second gear installed on the flow shaft and connected to the first gear when the flow shaft moves toward the output shaft; A first pulley installed on the rotation shaft of the second gear; A second pulley installed on the rotation shaft of the pinion; And a belt member that is simultaneously wound around the first pulley and the second pulley, and transmits power to the second pulley while the first pulley is rotated when the power of the motor is transmitted to the rotation shaft of the first gear. It is characterized by that.

The apparatus for preventing sagging of an overhead transmission line according to the present invention is provided with a sensing unit that detects whether the transmission cable is sagging, so when the transmission cable is sagged by an external force such as wind, it senses the sag and transmits a sag signal from the sensing unit. Since a compensation drive unit that operates according to the transmitted sag signal is provided, the compensation work for returning the sag of the transmission cable to its original state can be omitted by providing tension to the transmission cable where sagging occurs and pulling the transmission cable. There is an advantage that can be promoted.

In addition, the apparatus for preventing sagging of an overhead transmission line according to the present invention prevents the transmission cable from sagging again even if the power is cut off to the compensation driving unit after the compensation operation for restoring the transmission cable to its original state by providing tension to the transmission cable is completed. Since the position fixing unit is provided, there is an advantage of preventing the transmission cable from sagging again after the compensation operation is finished.

In addition, the device for preventing sagging of an overhead transmission line according to the present invention is provided with a compensation drive unit that provides tension to the transmission cable and a linkage unit that prevents interference between parts by operating simultaneously. As the driving unit and the position fixing unit are driven at the same time, there is an advantage of preventing parts from being damaged.

1 is a block diagram showing a sagging device of an overhead transmission line according to an embodiment of the present invention.
2 is a cross-sectional view illustrating a compensation driving unit and a sensing unit of an apparatus for preventing sagging of an overhead transmission line according to an embodiment of the present invention.
3 is a cross-sectional view showing a compensation driving unit and a position fixing unit of the deflection prevention device of an overhead transmission line according to an embodiment of the present invention.
4 is a diagram illustrating a compensation driving unit and a linking unit of an apparatus for preventing sagging of an overhead transmission line according to an embodiment of the present invention.

Hereinafter, an embodiment of an apparatus for preventing sagging of an overhead power transmission line according to the present invention will be described with reference to the accompanying drawings.

In this process, thicknesses of lines or sizes of components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, and may vary according to the intention or custom of users or operators.

Therefore, definitions of these terms should be made based on the contents throughout the present specification.

1 is a configuration diagram showing a sagging prevention device of an overhead transmission line according to an embodiment of the present invention, and FIG. 2 is a compensation driving unit and a sensing unit of a sagging prevention device of an overhead transmission line according to an embodiment of the present invention. 3 is a cross-sectional view showing a compensation driving unit and a position fixing unit of a deflection prevention device of an overhead transmission line according to an embodiment of the present invention, and FIG. 4 is a view of an overhead transmission line according to an embodiment of the present invention. It is a view showing the compensation driving unit and the linkage of the deflection prevention device.

1 to 4, the device for preventing sagging of an overhead power transmission line according to an embodiment of the present invention is installed such that the wangeum 12 extends from the fixing ring member 14 installed on the electric pole 10, When the transmission cable 100 passing through the support ring installed at the end of the insulator 18 installed to extend downward from the wangeum 12 sags in a downward direction more than a set value, a sensing unit that senses it and transmits a sag signal ( 80) and when the deflection signal transmitted from the sensing unit 80 is received, a portion of the transmission cable 100 is pulled upwards or downwards, while providing tension to the transmission cable 100, while providing the transmission cable 100 to its original position. When tension is provided to the transmission cable 100 by the operation of the compensation driving unit 50 to restore and the compensation driving unit 50, when the transmission cable 100 returns to its original state, the compensation driving unit 50 is restrained and the power is cut off. Also, the position fixing unit 70 that maintains the tension provided from the compensation driving unit 50 to be provided to the transmission cable 100, and the compensation driving unit 50 and the position fixing unit 70 are driven at the same time to interfere between parts It includes an interlocking portion 90 to prevent this from occurring.

A support ring is installed at the lower end of the insulator 18 extending from the wangeum 12 installed on the post, and the transmission cable 100 is installed to pass through the support ring to form an overhead transmission line, and external forces such as wind for a long time When acting on the transmission cable 100, a gap may be generated between the parts constituting the support ring installation structure, and thus may be drooped downward of the transmission cable 100 in the gap between the posts.

At this time, in this embodiment, the degree of sagging toward the lower side of the transmission cable 100 by the operation of the sensing unit 80 is sensed, and the degree of sagging of the transmission cable 100 detected by the operation of the sensing unit 80 When is exceeding the set value, while providing tension to the transmission cable 100 by the operation of the compensation drive unit 50, it is possible to return to the original position of the transmission cable 100.

The sensing unit 80 of this embodiment is installed at one end of the through-hole part 34 and the pressing block 32 in which the through hole 34 is formed so as to pass through the transmission cable 100 extending through the support ring. , The first sensor 84a that senses the load generated when the transmission cable 100 sags downward, and transmits a sag signal when the load of the transmission cable 100 exceeds the set value, and the center of the through hole 34 And a second sensor 84b that is installed in and detects the load generated when the transmission cable 100 sags downward, and transmits a sag signal when the load of the transmission cable 100 exceeds a set value, and a through hole 34 ), it is installed at the other end of the transmission cable 100, detects the load generated when the transmission cable 100 sags downward, and includes a third sensor 84c that transmits a sag signal when the load of the transmission cable 100 exceeds a set value. .

The through-hole portion 34 of the pressing block 32 is disposed in the same straight line or in a similar direction as the support ring and extends through the support ring, and the through-hole portion 34 of the pressing block 32 of the transmission cable 100 extends through the support ring. ), the inner diameter of the overpass hole is formed larger than the diameter of the power transmission cable 100, so that the transmission cable 100 installed to maintain sufficient tension between the support ring and the support ring is provided with a through-hole part 34 ) It does not contact the inner wall and maintains the gap.

When the power transmission cable 100 is maintained with sufficient tension, even if the power transmission cable 100 contacts the inner wall of the through hole 34, a load is not applied to the lower side of the through hole 34.

After the transmission cable 100 is installed, if a gap is generated between the parts that have supported the transmission cable 100 due to external forces such as wind and rain for a long period of time, it may droop downward of the transmission cable 100, at this time, By the operation of the sensing unit 80 installed on the inner wall of the through-hole part 34, it is possible to detect whether it is sagging beyond the set value of the transmission cable 100.

It is possible to determine the section in which sagging of the transmission cable 100 occurs according to the sag signal transmitted from the first sensor 84a to the third sensor 84c, and the transmission cable 100 passing through the through hole 34 A sensing ring member made of a metal material is installed in a part, and the sensing ring member is inserted from one end to the other end of the through hole part 34 to prevent the transmission cable 100 from being directly connected to the through hole part 34, When sagging occurs in the transmission cable 100 located at one side with the sensing ring member as the center, the sensing ring member is inclined in one direction and the sensing ring member presses the first sensor 84a. The sag signal is transmitted from the first sensor 84a, so that the controller can determine whether the transmission cable 100 is sagging and the sag position of the transmission cable 100.

Therefore, when determining the section in which the transmission cable 100 sags according to the sag signal transmitted from the first sensor 84a to the third sensor 84c, the compensation drive unit 50 installed in the sag section of the transmission cable 100 Since the driving signal is transmitted, tension is provided while pulling the transmission cable 100 that is drooping in the downward direction upward, so that the transmission cable 100 can be prevented from sagging in the downward direction beyond the set value.

The compensation drive unit 50 of this embodiment is installed to be elevating in the vertical direction through the mounting base 16 extending in the lateral direction from the fixing ring member 14 and the mounting base 16, and a rack gear ( 52) is formed, a pressure shaft 30 on which a pressure block 32 is installed at the bottom, a pinion member 54 rotatably installed on the mounting table 16 so as to be geared to the rack gear 52, and a pinion It includes a motor 56 that provides power to rotate the member 54 in the forward or reverse direction, and a power transmission unit 57 that transmits the power of the motor 56 to the pinion member 54.

Therefore, when power is applied to the motor 56 according to the driving signal transmitted from the control unit, the pinion member 54 rotates in the forward or reverse direction as the motor 56 is driven in the forward or reverse direction, and the pinion member 54 and the gear are connected. As the pressing shaft 30 is raised or lowered by the rack gear 52, the pressing block 32 is raised or lowered, so that a part of the transmission cable 100 passing through the pressing block 32 is raised or lowered. Tensile force is provided to the transmission cable 100.

The power of the motor 56 is transmitted to the pinion member 54 by the power transmission unit 57, and the power transmission unit 57 of this embodiment is a first gear 57a installed on the output shaft of the motor 56 Wow, when the flow shaft 58 is slidably installed on the mounting table 16 so as to be able to move forward or backward toward the output shaft of the motor 56, and is installed on the flow shaft 58, the flow shaft 58 is moved toward the output shaft. A second gear 57b connected to the first gear 57a, a first pulley 58a installed on the rotation shaft of the second gear 57b, and a second pulley 58b installed on the rotation shaft of the pinion , When the first pulley (58a) and the second pulley (58b) are simultaneously wound and the power of the motor 56 is transmitted to the rotation shaft of the first gear (57a), the first pulley (58a) is rotated and the second pulley ( It includes a belt member (58c) for transmitting power to 58b).

Therefore, when power is applied to the motor 56, the first gear 57a installed on the output shaft of the motor 56 rotates, and the second gear 57b connected to the first gear 57a rotates. 2 Since the flow shaft 58 on which the gear 57b is installed is rotated, the first pulley 58a is rotated.

Since the first pulley 58a and the second pulley 58b connected by the belt member 58c are rotated, the pinion member 54 is rotated forward or backward while the rotation shaft on which the pinion member 54 is installed is rotated. .

Here, the flow shaft 58 on which the second gear 57b is installed is slidably installed along the guide rail 59 formed on the mounting table 16, and the flow shaft 58 and the position fixing part 70 Since the interlocking part 90 is installed, the pressure shaft 30 is constrained by the operation of the position fixing part 70, and the first gear by the operation of the linking part 90 when the position of the pressure block 32 is determined. The position by preventing the power of the motor 56 from being transmitted to the pinion member 54 even if the power is applied to the motor 56 due to an operator's misoperation because the connection between the 57a and the second gear 57b is released. It is possible to prevent a malfunction that occurs when the fixing unit 70 and the compensation driving unit 50 are simultaneously driven.

As described above, since the compensation driving unit 50 and the position fixing unit 70 are not driven at the same time by the operation of the interlocking unit 90, interference generated when the compensation driving unit 50 and the position fixing unit 70 are simultaneously driven. And it becomes possible to prevent breakage.

The position fixing part 70 of this embodiment includes a fixed cylinder 72 provided on the mounting table 16, a rod 74 protruding from the fixed cylinder 72, and a pressure shaft so that the rod 74 can be inserted. (30) It is formed on the circumferential surface, and includes a fixing groove 76 that is continuously formed while maintaining a gap in a plurality of vertical directions.

Therefore, when the position of the pressure block 32 provided at the bottom of the pressure shaft 30 is determined after the pressure shaft 30 is raised or lowered while the pinion member 54 rotates, the rod 74 is removed from the fixed cylinder 72. It protrudes and is inserted into the fixing groove 76 to restrain the lifting motion of the pressing shaft 30.

As described above, when the rod 74 protruding from the fixed cylinder 72 is inserted into the fixing groove 76 of the pressing shaft 30, the position of the pressing shaft 30 is fixed and the pressing block 32 is raised or lowered. Because the tensile force applied to the power transmission cable 100 is maintained, a tensile force that pulls the power transmission cable 100 so as not to sag in the downward direction is maintained.

In addition, since the inclined surface 78 is formed to be inclined in an outward direction so as to widen the inlet of the fixing groove 76 on the entrance side of the fixing groove 76 of the present embodiment, the rod 74 is protruded from the fixed cylinder 72 Even if 74 is slightly spaced from the fixing groove 76, the end of the rod 74 can be inserted into the fixing groove 76 while sliding along the inclined surface 78.

The linkage portion 90 of the present embodiment includes a support connecting rod 92 that is bent rearwardly after being branched from one side of the rod 74 in the lateral direction to be integrally connected to the flow shaft 58.

Therefore, when the rod 74 protrudes from the fixed cylinder 72 and is inserted into the fixed groove 76, the support connecting rod 92 moves linearly with the rod 74 while advancing the support connecting rod 92 while advancing the flow shaft 58 Since the first gear (57a) is moved in a direction away from the first gear (57a), the first gear (57a) and the second gear (57b) is not connected to the gear when the rod 74 is inserted into the fixing groove (76).

Conversely, when the rod 74 is inserted into the fixed cylinder 72, the support connecting rod 92 presses the flow shaft 58 toward the first gear 57a, so that the flow gear is the first gear along the guide rail 59. Sliding toward the (57a) side, at this time, the second gear (57b) and the first gear (57a) is gear-connected to transmit the power of the motor (56).

In addition, in this embodiment, as the second gear 57b moves forward or backward as described above, the first pulley 58a installed on the flow shaft 58 also moves forward or backward, so that the first pulley 58a and The tension in the belt member 58c that is wound between the second pulleys 58b is released and sagging may occur in the downward direction. In this embodiment, it is installed inside the belt member 58c formed in a closed curve shape, An elasticity providing portion is provided for pressing and pushing the belt member 58c outward.

Therefore, when the tension provided to the belt member 58c is released as the gap between the first pulley 58a and the second pulley 58b of the present example is released, the upper portion of the belt member 58c It is possible to prevent the tension provided to the belt member 58c from being released while deforming the belt member 58c while pressing upward and the lower side of the belt member 58c is pressed downward.

The elasticity providing unit of this embodiment includes a pair of passage ring members through which the belt member 58c is slidably passed, and an elastic member interposed between the pair of passage ring members so that the gap between the pair of passage ring members is widened. Includes.

As described above, since the elastic member provides an elastic force to widen the gap between the pair of through ring members, the gap between the first pulley (58a) and the second pulley (58b) is narrowed and the belt member (58c) When the provided tension is released, it is possible to prevent the tension from being released from the belt member 58c as the gap between the pair of passage ring members is widened by the elastic force provided from the elastic member.

Unexplained reference numerals 16a and 36 denote a cover member 16a for closing the power transmission part 57 and a stopper 36 for preventing the pressure shaft 30 from being separated from the mounting table 16.

As a result, it is possible to detect the sag of the transmission cable in real time, and if it sags above the set value of the transmission cable, it is possible to prevent sagging beyond the set value of the transmission cable by providing a tensile force to the transmission cable while raising or lowering a part of the transmission cable. In addition, after the compensation operation that provides tensile force to the transmission cable is in progress, it is possible to prevent additional sagging of the transmission cable while maintaining the state that the tensile force is provided to the transmission cable, and the operation of providing the tension and the operation of maintaining the tension are simultaneously performed. As progress progresses, it is possible to provide a device for preventing sagging of an overhead power transmission line that can prevent interference between parts.

The present invention has been described with reference to an embodiment shown in the drawings, but this is only exemplary, and various modifications and other equivalent embodiments are possible from those of ordinary skill in the field to which the technology belongs. Will understand.

In addition, the deflection prevention device of the overhead power transmission line has been described as an example, but this is only exemplary, and the deflection prevention device of the present invention may be used in other products other than the deflection prevention device of the overhead power transmission line.

Therefore, the true technical protection scope of the present invention should be determined by the following claims.

10: Jeonju 12: Completed
14: fixing ring member 16: mounting table
16a: cover member 18: insulator
30: pressure shaft 32: pressure block
34: through hole 36: stopper
50: compensation drive unit 52: rack gear
54: pinion member 56: motor
57: power transmission part 57a: first gear
57b: second gear 58: flow shaft
58a: first pulley 58b: second pulley
58c: belt member 70: position fixing unit
72: fixed cylinder 74: rod
76: fixing groove 78: inclined surface
80: sensing unit 82: sensing ring member
84: pressure sensor 84a: first sensor
84b: second sensor 84c: third sensor
90: linkage 92: support connecting rod

Claims (4)

When the transmission cable passing through the support ring installed at the end of the insulator installed to extend downward from the fixed ring member installed on the electric pole is installed to extend downward, it is detected and a deflection signal A sensing unit that transmits;
A compensation driving unit for returning the transmission cable to its original position while providing tension to the transmission cable while pulling a portion of the transmission cable upward or downward when the sag signal transmitted from the sensing unit is received;
When the power transmission cable is returned to its original state while tension is provided to the transmission cable by the operation of the compensation driving unit, the position fixing unit maintains the tension provided from the compensation driving unit to be provided to the transmission cable even if the compensation driving unit is shut off by blocking the power ; And
The compensation driving unit and the position fixing unit are driven at the same time and includes a linking unit that prevents interference between parts,
The sensing unit,
A pressing block having a through hole formed therethrough so as to pass through the transmission cable extending through the support ring;
A first sensor installed at one end of the through hole, sensing a load generated when the transmission cable sags downward, and transmitting a sag signal when the load of the transmission cable exceeds a set value;
A second sensor installed in the center of the through hole, sensing a load generated when the transmission cable sags downward, and transmitting a sag signal when the load of the transmission cable exceeds a set value; And
A third sensor installed at the other end of the through hole, sensing a load generated when the transmission cable sags downward, and transmitting a sag signal when the load of the transmission cable exceeds a set value,
It is possible to determine a section in which sagging of the transmission cable occurs according to the sagging signal transmitted from the first sensor to the third sensor,
The compensation driving unit,
An installation base extending in a lateral direction from the fixing ring member;
A pressing shaft installed to be elevating in a vertical direction through the mounting table, a rack gear formed on a circumferential surface, and the pressing block installed at a lower end;
A pinion member rotatably installed on the mounting table to be gear-connected to the rack gear;
A motor providing power to rotate the pinion member in a forward or reverse direction; And
Including a power transmission unit for transmitting the power of the motor to the pinion member,
The power transmission unit,
A first gear installed on the output shaft of the motor;
A flow shaft slidably installed on the mounting table so as to move forward or backward toward the output shaft of the motor;
A second gear installed on the flow shaft and connected to the first gear when the flow shaft moves toward the output shaft;
A first pulley installed on the rotation shaft of the second gear;
A second pulley installed on the rotation shaft of the pinion; And
A belt member that is simultaneously wound around the first pulley and the second pulley and transmits power to the second pulley while the first pulley is rotated when the power of the motor is transmitted to the rotation shaft of the first gear. A device for preventing sagging of an overhead transmission line, characterized by. delete delete delete

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