JPH0789692B2 - Power line snowfall equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a snowfall device that efficiently removes snow accretion on a transmission line and prevents the transmission line from being damaged by snow.

[Prior Art] It has been occasionally reported that, when snow accumulates on a transmission line and rotatively expands to form snow snow, excessive tension is generated due to its weight, which does not stop the wire from breaking and even causes the tower to collapse. That's right.

In order to prevent such an accident, there is a proposal to prevent the rotation of the snow cylinder by fitting a ring to the electric wire or forming a fin-shaped projection, but it is effective only for a specific snow quality. Not enough.

Furthermore, in order to directly melt the snow, there are proposals to attach a magnetic substance to the electric wire and use heat generated by hysteresis loss, or to wind a heater directly on the electric wire, but it does not generate enough heat or consumes a large amount of power. Therefore, it is not always practical.

In Japanese Utility Model Laid-Open No. 59-34433, a shape memory alloy is wound around an electric wire in a spiral shape with a gap, and the shape memory alloy undergoes a shape change at a snowfall temperature to cause expansion and contraction deformation. There is a disclosure about a technique for scraping off snow adhering by moving.

However, when a long spiral rod for snowfall is wound around an electric wire to remove the adhered snow, it is difficult to sufficiently operate the electric wire with the elastic deformation force of the shape memory alloy.
Further, there is also a problem that an industrial shape memory alloy is deformed in only one direction due to a temperature change, and an external force is required to restore the original shape.

Further, JP-A-60-213217 discloses a technique for running a snowfall traveling body on an electric wire to scrape off snow adhering to the electric wire. However, in order to stop driving this snowfall traveling body, since it is traveling on an electric wire in a live line state, a remote control device is required, and when performing remote control using a wireless signal, this remote control device includes: Although radio signals such as FM are used, they often malfunction due to noise. Further, since this remote operation is performed by the operator, it may not be possible to cope with late night snowfall.

Further, there has been proposed a device in which a hammer for applying an intermittent impact force to an electric wire is attached, and the impact force is applied to the electric wire by the hammer during snowfall to drop the snow. However, providing a protrusion such as a hammer on the outer circumference of the electric wire has many electrical problems, and there are problems such as snow accretion on the device itself and an increase in wind pressure load, which has not yet been put into practical use.

[Problems to be Solved by the Invention] In light of the above-mentioned circumstances, the applicant has previously described the ninth and
We proposed a snowfall device as shown in Fig. 10. (Japanese patent application
62-154087) This is a spiral rod 2 which is preformed on the outer circumference of the electric wire 1 so as to have an inner diameter larger than the outer diameter of the electric wire 1.
Is wound, the electric power is supplied from the current transformer 7 to rotate the motor 4, and the spiral rod is forcibly rotated or linearly moved by the driving device 26 via the clutch 25. Since the gap δ exists between the electric wire 1 and the spiral rod 2, the spiral rod 2 can be easily driven by the drive device 26, and the snow is scraped off by its rotation or linear movement.

Furthermore, the applicant has also proposed a snowfall device as shown in FIG. 11 which is an improvement of the device according to the above proposal. (Japanese patent application
63-90571) This is to eliminate the possibility that the electric wire 1 and the spiral rod 2 directly contact with each other in the proposed example of FIGS. 9 and 10 and damage the outer surface of the electric wire.
The first spiral rod 2 ₁ is closely wound on the outer surface of the first spiral rod 2 ₁ and a movable gap is provided on the first spiral rod 2 ₁ so that the second spiral rod 2 _{2 is connected} to the first spiral rod 2 ₁ . is wound so that the opposite direction, in which to perform a rotational or linear motion by the driving device to the second spiral rod 2 _2.

In this case, since the first spiral rod 2 ₁ between the second spiral rod 2 ₂ and the wire 1 which is driven by a drive device is present, it up for damage to the wire mentioned above is eliminated.

However, neither the proposed example of FIGS. 9 and 10 nor the proposed example of FIG. 11 is not without problems.

In other words, when the amount of snowfall is very large, the ability to scrape off snow accretion by the spiral rod 2 is limited, and even if the spiral rod is driven, the thickness of snow accreted will increase little by little, and finally the driving Has been found to be stopped.

In addition, when there is snowfall during the day and the temperature temporarily rises to cause snow accretion containing a large amount of water, the temperature may drop sharply and freeze at night. If there is such freezing, the spiral rod is firmly fixed by it, and even if there is snowfall thereafter, it cannot be driven.

In order to avoid the above-mentioned driving stoppage or inability to drive, it is necessary to increase the wire diameter of the spiral rod, increase the strength, and enlarge the driving device to generate a strong driving force. However, the size of the entire apparatus becomes large, which is not desirable in all aspects.

The object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a novel method capable of stable driving even under climatic conditions in which a large amount of snowfall occurs and further, freezing occurs. It is intended to provide a snowfall device.

[Means for Solving the Problems] The present invention is to wind a first spiral rod that has been preformed on the outer circumference of an electric wire, and preform it on the first spiral rod in the opposite direction. In the device configured to wind the second spiral rod thus formed with a moving gap, and to make it possible to drop the snow on the electric wire by rotating or linearly moving the second spiral rod by a driving device, The first gist is to incorporate or attach a heating element to at least one of the first or second spiral rods, and at least one of the first or second spiral rods is made of a ferromagnetic material. This is the second gist.

[Operation] If a heating element is built in or attached to at least one of the wound spiral rods, or if it is made of a ferromagnetic material and heat is generated due to hysteresis loss of the ferromagnetic material. Also, even when there is a large amount of snowfall or in the case of weather conditions in which the snowfall freezes, it is possible to stably continue the drive of the spiral rod by melting the snowfall with the heating element.

[Examples] Hereinafter, the present invention will be sequentially described with reference to Examples.

FIG. 1 shows that the first spiral rod 2 ₁ is closely wound around the outer circumference of the electric wire 1 and the second spiral rod 2 ₂ is formed with a gap above it.
It shows the case of winding in a cross shape.
The configuration is different from the conventional configuration shown in the figure. That is, in the present invention to indicate one specific example in Figure 2, is caused to internal heating element 13 to the second central portion of the spiral rod 2 _2. The heat generated by this heating element causes the second
It melted the snow in the vicinity of the spiral rod 2 _2, but also allowed to secure a sufficient falling snow capability in a case snowfall is very large.

Note that heating element 13 is not permissible be additionally provided to the first spiral rod 2 ₁ As shown in Figure 3 instead of allowed to built in the second spiral rod 2 ₂ as described above. As described above, whether the heating element 13 is built-in or additionally provided may be appropriately selected in consideration of the snow quality of the place where the snowfall device is installed.

Figure 4 is a heating element 13 instead of the adhesion additionally provided to the first spiral rod 2 ₁ as of FIG. 3, an example in wound substantially intermediate position of the first spiral rod 2 ₁ winding pitch It is shown. There is no problem even if it is wound and installed between the spiral rods in this way.

Figure 5 is a first spiral rod 2 ₁ itself constitutes a heating element (The internal becomes concept present invention refers comprises a case which constitutes a heating element such as a spiral rod itself) motor 4 of the drive unit 3 Current transformer to power the
Installing a separate current transformer 7 ₂ in addition to the 7 _1, joined by the current transformer 7 ₂ and the first spiral rod 2 ₁ and the lead wire 14, the first spiral of the current transformer 7 ₂ as a power supply It illustrates an example where allowed to exotherm rod 2 _1.

In the above, the case where a heating element is built in or attached to the spiral rod has been taken as an example, but the spiral rod 2 ₁ , 2 ₂
At least one of them may be made of a ferromagnetic material.

If the spiral rod is made of a ferromagnetic material as described above, the transmission current of the power transmission line 1 causes the ferromagnetic material to generate heat due to hysteresis loss, and it is possible to generate heat without requiring a special power source. It is possible to make the entire device simpler.

FIGS. 6 to 8 are explanatory views showing a specific configuration of the spiral rod drive mechanism. In either case, the rotational driving force of the motor 4 of the driving device is converted into a linear reciprocating motion, and the linear reciprocating motion is given as the driving force of the spiral rod. That is, FIG. 6 is an explanatory view showing a specific example of such a configuration. A dog 17 is attached to a shaft 15 to which a spiral rod is fixed, a screw shaft 16 is installed in parallel with the shaft 15, and the dog 17 is provided. And the screw bearing 18 are connected.
The rotation of the motor 4 causes the screw shaft 16 to rotate, which causes the screw bearing 18 to move forward or backward, and the shaft 15 connected to the screw shaft 18 to move forward or backward to give the spiral rod 2 a driving force for snowfall. obtain.

In the figure, 7 is an AC power source, 19 is a changeover switch for changing the rotation direction of the motor, and 20 is a torque limiter for preventing an excessive load from being applied to the motor 4.

FIG. 7 shows another embodiment, in which the rotational force of the motor 4 is converted into a linear motion by the rack and pinion mechanism 21,
The shaft 22 of the rack pinion is connected reciprocally motion as shown by arrows, forward a second spiral rod 2 ₂ -
It is configured so that it can be retracted.

Figure 8 is shows still another embodiment, the sprocket 24 is rotated by the rotation of the motor 4, the fixed thereby rotated the chain 23, as the second spiral rod 2 ₂ Figure to the chain 23 With this, the spiral rod can be moved forward and backward.

With such a structure in which the driving force is applied by the chain, it is not necessary to convert the rotation of the motor for the reciprocating motion, and there is an advantage that a control device for switching the reciprocating motion is unnecessary.

In the above embodiment, the heating element does not necessarily have to be linear, and a thin sheet may be used.

[Advantages of the Invention] As described above, according to the snowfall device of the present invention, the spiral rod can be smoothly operated without increasing the size of the device even under climatic conditions in which there is a great deal of snowfall or freezing. And its practical utility is extremely large.

[Brief description of drawings]

1 to 5 show an embodiment of an apparatus according to the present invention in which a heating element is built in or attached to a spiral rod. FIG. 1 is an explanatory front view thereof, and FIGS.
FIG. 4 is a sectional front view showing another embodiment, FIG. 5 is an explanatory front view showing another embodiment, and FIGS. FIG. 9 is an explanatory front view of an example of a default plan, FIG. 10 is a sectional view taken along the line AA ′ of FIG. 9, and FIG. 11 is an explanatory front view of another example of the default plan. Is. 1: Power line, 2: Spiral rod, 2 ₁ : First spiral rod, 2 ₂ : Second spiral rod, 3: Drive device, 4: Motor, 7,7 ₁ , 7, _{2 2} : Current transformer, 13: Heat generation Body, 15: Shaft, 16: Screw shaft, 18: Screw bearing, 21: Rack and pinion, 23: Chain.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Kawakami 3550 Kidayomachi, Tsuchiura City, Ibaraki Prefecture Hitachi Cable Ltd. (72) Inventor Kenji Yamamoto 1500 Kawajiri Town, Hitachi City, Ibaraki Hitachi Cable Co., Ltd. In the Toyoura Plant (56) Reference JP-A-63-316607 (JP, A) JP-A-47-19391 (JP, A) JP-A 1-97125 (JP, A) Actual development Sho-59-8230 (JP, A) U)

Claims (2)

[Claims] 1. A first spiral rod formed in advance around an outer periphery of an electric wire is wound, and a second spiral rod formed in advance in a direction opposite to the spiral rod is formed on the first spiral rod. The second spiral rod is wound around a movable gap so that the second spiral rod can be rotated or linearly moved by a driving device, and a heating element is built in or attached to at least one of the first and second spiral rods. A power line snowfall device. 2. A first spiral rod, which is shaped in advance, is wound around the outer circumference of an electric wire, and a second spiral rod which is shaped in the opposite direction to the first spiral rod is formed above the first spiral rod. Winding with a moving gap,
Of the above-mentioned spiral rod is configured to be rotatable or linearly movable by a driving device, and at least one of the first and second spiral rods is formed of a ferromagnetic material.