JPH04222415A - Snow scraping device for transmission line - Google Patents

Abstract

PURPOSE:To realize weight reduction and to drop the snow efficiently by disposing a power supply control section for driving a scraper having inner diameter larger than the outer diameter of a wire closely to an arm of a steel tower while spacing from the scraper. CONSTITUTION:A radio repeater 11 and an antenna 12 are mounted on an arm 23 of a steel tower. A receiver 10, an antenna 13 and a power supply control section 9 are disposed, closely to a clamp 21, on a wire 20 anchored through the clamp 21 to an insulator string 22. A wire protecting spiral rod 8 is wound around the wire 20 and a snow removing spiral rod 3 is wound spirally in reverse direction thereon. A power supply control cable (not shown) is contained on the inside of the wire protecting spiral rod 8. A plurality of scrapers 1 having inner diameter larger than the outer diameter of the wire 20 including the spiral rods 8, 3 and provided with driving rods 2 in front and rear are arranged on the wire 20. The radio repeater 11 remote controls the receiver 10 to actuate the power supply control section 9 so as to control the current thus remote controlling the scraper 1. According to the invention, weight of snow drop device is reduced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow removal device that efficiently removes snow accumulated on power transmission lines using a so-called scraper method and prevents snow damage to the power transmission lines.

0002

[Prior Art] When snow falls on a power transmission line and rotates and thickens to form a snow pipe, the weight of the snow causes excessive tension, which can lead to not only the wire breaking but also the worst case scenario, such as the collapse of a steel tower.
As has been reported from time to time.

[0003] In order to prevent such accidents, there have been proposals to prevent the rotation of the snow pipe by fitting a ring onto the electric wire or forming fin-like protrusions, but depending on the specific snow quality, However, it is ineffective and insufficient.

[0004] Furthermore, in order to directly melt snow, there are proposals to attach magnetic materials to electric wires and utilize the heat generated by hysteresis loss, or to wrap heaters directly around electric wires, but these methods do not produce enough heat or consume a large amount of power. Therefore, it is not necessarily practical.

On the other hand, there is a so-called scraper-type snow removing device that winds a long spiral rod for snow removal around an electric wire with a gap, and rotates or moves the spiral rod in the longitudinal direction to scrape off snow adhering to the electric wire. Proposed. (For example, Utility Model Application Publication No. 59-34433) However, the above-mentioned known technology is a technology in which the shape memory alloy undergoes a shape change at snowfall temperature to cause it to expand and contract, and the snow that has adhered to it is scraped off by the deformation movement. When removing attached snow by winding a long spiral rod for snow removal, it is difficult to operate the rod sufficiently with the expansion and contraction deformation force of the shape memory alloy. Furthermore, industrial shape memory alloys deform in only one direction due to temperature changes, and an external force is required to return them to their original shape, which makes them not very practical.

In order to solve this problem, a spiral rod pre-shaped so as to have an inner diameter larger than the outer diameter of the electric wire is wound around the outer circumference of the electric wire.
A technique has been proposed in which a motor is rotated by obtaining power from a current transformer, and a driving device is used via a clutch to forcefully rotate or linearly move the spiral rod to scrape off snow with the rotation or linear movement.

[0007]

[Problems to be Solved by the Invention] According to the forced drive system of the spiral rod, snow can be scraped off the electric wires with sufficient driving force, but how to drive and stop the snow removal device? The problem is that, for example, a receiving antenna and a receiving device are installed on the drive device, and when it snows, the operator issues an operation command using an operating device with a wireless transmitter to drive the drive device. It is surprisingly troublesome, as it requires operations such as driving a spiral rod wrapped around electric wires to cause the snow to fall, and monitoring is required for this purpose.

[0008] Therefore, a scraper-type snow removal device as shown in FIG. 4 was previously proposed. (Patent application Hei 1-112
711) This involves winding the electric wire protection spiral rod 8 around the electric wire 20, winding the snow removal spiral rod 3 so as to intersect with the electric wire 20, and then moving the drive rod 2 from the drive device main body 1 to the whole body in the direction indicated by the arrow in the figure. The drive rod 2 and the spiral rod 3 for snow removal are connected as shown in the figure.

This device is equipped with a current transformer 4 serving as a power source, a motor 5 driven by the current transformer, a control device 6, and a snowfall detection sensor 7, and the detection results of the snowfall detection sensor 7 are sent to the control device. It is configured such that a drive command can be given to the drive device main body 1 by inputting it.

With this configuration, when the snowfall detection sensor 7 does not detect snow, the control device 6 gives a stop signal to the drive device main body 1, and when the snowfall detection sensor 7 detects snowfall, the control device 6 Since a drive command can be issued to the drive device main body 1 to cause the spiral rod 3 to start the snow removal operation, the snow removal device can be operated most effectively at the time when it is most needed. Moreover, since it is possible to operate the driving device main body 1 only by the detection signal from the snowfall detection sensor 7, it is possible to drive the snow removal device automatically, and there is no need for operator control. A great feature of this system is that the necessary snow-falling action can be performed at any place and at any time.

Although this device has the above-mentioned advantages, there is a limit to the snowfall length of the spiral rod, and there is little point in installing only one device in an overhead wire span, and multiple devices are installed in the span. It is often necessary to install a base. in this case,
Since a current transformer and a control device are required for each drive device main body, there is a problem in that the device becomes over-equipped, and its construction and maintenance become complicated and troublesome. Moreover, it is undeniable that the weight etc. also increase accordingly.

An object of the present invention is to solve the problems of the prior art as described above, to make the entire drive system even more compact even when a plurality of drive unit bodies are installed, and to enable drive control using weak radio waves. The purpose of the present invention is to provide a new scraper-type snow removal device that makes it easier to remove snow.

[0013]

[Means for Solving the Problems] The present invention provides a scraper-type snow removal device in which the power source and control section for driving the drive device are separated from the main body of the drive device and installed near the tower arm. In this case, multiple drive unit bodies are installed between the overhead wire spans, and the power supply and control unit common to these multiple drive unit bodies are installed near the tower arm, or the electric wires are protected under the spiral rod for snow removal. A power control cable having a diameter smaller than the diameter of the electric wire protection spiral rod is arranged along with or housed within the electric wire protection spiral rod.

[0014]

[Operation] When the power source and control device are installed integrally or close to each drive device main body, since they are installed between the electric wires, there are many restrictions on shape, size, weight, etc. The design for the exchange becomes extremely troublesome.

However, if the power supply/control section is separated and installed at the anchoring section or suspension section near the tower arm, the tower arm will indicate a stable state, so its size, shape, weight, etc. Since there are no major restrictions on the design, it is possible to design with sufficient margin, and the functionality of the entire device can be greatly improved.

[0016] Therefore, even if a plurality of drive unit bodies are installed in a span, power can be supplied with sufficient surplus power, and since a plurality of drive units can be controlled from one place, remote control by wireless is easy. Compared to the case where a power supply and control device are arranged for each drive device, the entire system is more compact and the cost reduction effect is also significant.

[0017]

[Examples] The present invention will be specifically described below with reference to Examples.

FIG. 1 is an explanatory diagram showing how the snow removal device according to the present invention is attached to an electric wire 20. In the figure, 1 is the same driving device main body as previously explained in FIG. 4, 2 is a driving rod that is driven forward and backward from the driving device main body,
3 is a snow removal spiral rod connected to the drive rod 2 and moved in the longitudinal direction of the electric wire as the drive rod 2 moves; 8 is a snow removal spiral rod that is connected to the electric wire 20 as the snow removal spiral rod 3 moves as shown in FIG. This spiral rod for protecting electric wires is wound so that the windings are crossed in the opposite direction to the spiral rod 3 for snow removal so as not to cause scratches on the spiral rod 3 for snow removal.

In the present invention, one or more drive device bodies 1, 1 are installed in the longitudinal direction of the electric wire 20 as necessary, and are equipped with a power supply section serving as a drive power source and a control section controlling the drive thereof. is separated from the drive device main body 1, for example, and placed close to the retaining clamp 21, as shown in the figure, the power supply control section 9
It will be installed separately as a.

If the power supply control cable 14 is wired from this power supply control section 9 to each of the drive device bodies 1, 1, even if the power supply control section 9 and the drive device body 1 are separated in this way, the snow removal device itself will not change. It is possible to operate it satisfactorily.

In wiring the power control cable 14 in this case, use a power control cable 14 with a diameter smaller than the outer diameter of the wire protection spiral rod 8, and hold the pipe as shown in FIG. If the spiral rod 8 for snow removal is housed inside the spiral rod 8 for protecting electric wires, or if it is wired along with the spiral rod 8 for protecting electric wires as shown in FIG. The possibility of damaging the power supply control cable 14 can be avoided.

On the other hand, regarding the power supply control section 9, its mounting position is close to the retaining clamp 21 which is firmly fixed to the steel tower arm 23 with the insulator chain 22, so that the power supply control section 9 is not connected to the electric wire as in the conventional example. Restrictions on size, shape, weight, etc. are greatly relaxed compared to the case where the power control unit is installed in the middle, and it becomes possible to install a large power supply control unit with excellent functionality.

Therefore, even when one driving device main body 1 is installed, or even if a plurality of driving device main bodies 1 are installed, sufficient driving power can be supplied to these driving device main bodies 1, 1.

A snowfall sensor as shown in FIG. 4 is installed in the power supply control unit 9, and the entire snow removal device is driven or stopped as explained above with reference to FIG. 4 based on the snow detection result by the snowfall sensor. Of course, automatic operation is possible. However, as shown in FIG.
0 and an antenna 12 or 13 respectively, remote wireless operation becomes possible using weak radio waves via the wireless repeater 11.

[0025] If wireless operation using weak radio waves is enabled in this way, if an emergency situation occurs during the movement operation using the snowfall sensor described above, a supervisor from below the tower can start or stop the snowfall sensor by radio. Particularly in the case where a plurality of drive device main bodies 1, 1 are attached, it becomes possible to sufficiently ensure operational safety.

In the present invention, the power supply control section 9 is installed near the tower arm 23, and as explained above, it is possible to provide a large margin in terms of design or function. The fact that it is installed nearby also makes maintenance work easier and has the great advantage of maintaining smooth operation of the entire device. In addition, the cost reduction effect of the entire snow removal device is extremely large by providing a single power supply control unit.

[0027]

[Effects of the Invention] As described above, according to the snow removal device according to the present invention, the power supply control section is not installed for each drive device main body, but it is installed all together near the tower arm where it can be stably installed. This not only improves the functionality of the entire device with a design that has ample room to overcome constraints such as shape and weight, but also improves the overall functionality of each drive device, which is attached to distribution lines without attached devices. Not only is the weight reduced and no undue load is placed on the electric wires, the cost of the device is also reduced, providing great cost performance, and the device is also safer because it can be started and stopped freely in emergencies using wireless control. It also has many advantages, including the ability to perform stable batch operations.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing how a device according to the present invention is attached to an electric wire.

FIG. 2 is a sectional view showing an embodiment of the wiring state of a power supply control cable.

FIG. 3 is a sectional view showing an embodiment of the wiring situation of the power control cable.

FIG. 4 is an explanatory front view of a scraper-type snow removal device that has already been proposed.

[Explanation of symbols]

1 Drive unit main body 2 Driving rod 3 Spiral rod for snow removal 8 Spiral rod for protecting electric wires 9 Power supply/control section 10 Receiver 11 Wireless repeater 12,13 Antenna 14 Power/control cable 20 Electric wire 21 Detention clamp 22 Insulator Ren 23 Steel tower arm

Claims (3)

[Claims] Claim 1: A spiral rod having an inner diameter larger than the outer diameter of the electric wire is wound around the outer circumference of the electric wire, and snow on the electric wire can be dropped by rotating or linearly moving the spiral rod by a driving device. A snow removal device for power transmission lines, in which the power source and control unit for driving the drive device are separated from the drive device main body, and this is installed near the tower arm. Claim 2: A plurality of drive device bodies are installed in the overhead wire span,
2. The snow removal device for a power transmission line according to claim 1, wherein a power source and a control unit common to the plurality of drive device bodies are installed. 3. A spiral rod for protecting electric wires is arranged under the spiral rod for snow removal, and a power control cable having a diameter smaller than the diameter of the spiral rod for protecting electric wires is attached to or attached to the spiral rod for protecting electric wires. 3. The snow removal device for a power transmission line according to claim 1, wherein the snow removal device is housed in a snow removal device for a power transmission line.