JPS6218905A - Automatic ground apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to the energizing side of the insulator chain that supports the power transmission line and the tower in order to ensure the safety of workers when carrying out power outage construction on the power transmission line tower. This invention relates to an automatic grounding device used to reliably short-circuit the arm.

(Prior art) When carrying out power outage work as described above, it is necessary to ensure that the power transmission line and the tower arm are short-circuited in order to prevent electric shock accidents due to incorrect power transmission or contact with other electric lines. Established by safety and health regulations.

For this reason, in the past, workers operated an insulating rod with a wire gripping metal fitting at the tip to attach the wire gripping metal fitting to the jumper wire of the power transmission line, and the grounding wire extending from the wire gripping metal fitting was attached to the tower arm using a clamping metal fitting. A grounding method was used to connect the However, in high-voltage transmission lines of 500,000 KV or more, the length of the insulator chain becomes significantly long, so when the transmission line (50) is stretched at an angle as shown in Figure 5, The jumper wire (51) is connected to the tower arm (5
2), and it was extremely difficult for workers to perform grounding work by manipulating an insulating rod several meters long from the top of the tower arm (52). Problems to be Solved) The present invention solves these conventional problems and safely and reliably connects the power transmission line and the tower arm even when the energized part of the power transmission line is far away from the tower arm. It was completed for the purpose of being an automatic grounding device that can ground the ground.

(Means for Solving the Problems) The present invention provides a grounding hand for gripping a metal fitting on the energized side of the insulator chain at the front part of a cart capable of moving the insulator chain, and a grounding hand and a grounding hand at the rear of the cart. A drum equipped with an electrically connected grounding metal fitting is provided, and an insulating chain with a grounding wire connected to the rear thereof is wrapped around the drum.

(Example) Next, the present invention will be explained in detail with reference to the illustrated example.
In the first embodiment shown in FIGS. 1 to 3 (1)
(3) is a traveling arm for moving the trolley (1); (4) is a gear equipped with a motor for driving the traveling arm; box, (5) is a battery, and (6) is a control box, and these mechanisms allow the trolley (1) to be connected to an insulator chain (40).
It can run on its own to reach the metal fitting (41) on the power charging side. (7) is a grounding hand provided at the front of this truck (3), and the grounding hand (7) is, for example, a pair of fingers pivotally supported at the tip of a sleeve (8) as shown in FIG. (9), a cylinder (10), and a gas cylinder (11) that supplies compressed gas to the cylinder (10);
It consists of a solenoid valve (12), etc. When the solenoid valve (12) opens and high pressure gas such as carbon dioxide gas is sent into the cylinder (10) from the gas cylinder (11), the piston (
13) moves forward and connects the finger (9) via the link (14).
) is pushed to close the finger (9), and when the solenoid valve (12) is closed, the piston (13) is moved back by the force of the spring (15), opening the finger (9). be able to. A conductive uneven portion (16) is formed on the inside of the finger (9) so that the metal fitting (41) on the energized side of the insulator chain (40) can be reliably clamped. ) has a bond wire (17)
is electrically connected to a grounding fitting (18) which will be described later. (19) shown in Figure 3 is a drum that can automatically rotate provided at the rear of the truck (1), and a leaf spring type grounding fitting (18) is protruded from the top surface of this drum (19). There is. The drum (19) has a ground wire (2
0) is wound around the insulating chain (21). A metal sleeve-shaped contact fitting (22) is provided at the tip of the grounding wire (20).
2) goes around from the bottom of the drum (19) and the grounding metal fitting (
18) and the drum (19), the ground wire (
20) and the ground hand (7) described above are connected to the bond wire (17).
) will be electrically connected via. Further, a U-shaped guide fitting (23) is supported on the lower side of the drum (19) by a spring (24) so as to be movable forward and backward.

The guide fitting (23) is connected to an insulated chain (21) as shown in the figure.
), and the insulated chain (2
When a large tension is applied to 1), it moves forward and the plate at its base (
25) kicks the limit switch (26) and the trolley (1)
A signal is sent to the control box (6) of the travel arm (3).
). In addition, in Figure 1 (27
) is a voltage detector, which emits a sound or light signal and sends a signal to the control box (6) when the metal fitting (41) on the power side of the insulator chain (40) clamped by the grounding hand (7) is energized. It is something to send. Further, (28) is a proximity sensor provided inside the grounding hand (7),
This is for detecting the metal fitting (41) on the energizing side of the insulator chain (40) when the truck (1) moves forward.

FIG. 4 shows a second embodiment of the present invention, in which the movement of the trolley (1) is controlled by an insulating rod (
This is different from the first embodiment in that step 30) is performed manually. This insulating rod (30) is made of FRP or the like, and expands and contracts like a swing-out fishing rod, allowing the trolley fi+ to be freely sent out and pulled back. Although the gear box (4), traveling arm (3), etc. are omitted in this embodiment, the other configurations are the same as in the first embodiment.

(Function) In the device configured as described above, an insulating chain (21) is wound around the drum (19), the tip of the insulating chain (21) is fixed on the tower arm, and the trolley (1) is connected to the insulator chain (21). 4
0), when the proximity sensor (28) at the front of the trolley (1) detects the metal fitting (41) on the charging side, the trolley (1) will stop and the ground hand (7)
clamps the metal fitting (41). Until this time, the trolley (1
) is moving forward while pulling the insulating chain (21), and the trolley (t+) and the tower arm are only connected by the insulating chain (21).Next, the voltage detector ( 27), after confirming that the power transmission line is not energized, the worker on the tower arm pulls the tip of the insulated chain (21) and the ground wire (27) connected to the rear of the insulated chain (21) 20) is a trolley (
1) and the contact fitting (
22) engages with the grounding fitting (18) on the top of the drum (19). The base of the ground wire (20) is clamped to the tower arm in advance, so the ground hand (7) and the bond wire (1
7), grounding fitting (1 day), contact fitting (22), grounding wire (
The grounding between the metal fitting (41) on the power-supplying side and the steel tower arm is ensured through the path 20). In this way, electrical work is carried out after the grounding is completed, and after the work is completed, if the worker strongly pulls both the insulated chain (21) and the grounding wire (20), the aforementioned guide (23) moves and the limit switch ( 26), which causes the solenoid valve (12) to
opens the grounding hand (7), so that the carriage fl) can be pulled back to the base of the insulator chain (40) manually or by reversing the traveling arm (3).

(Effects of the Invention) As is clear from the above description, the present invention is provided with a grounding hand for gripping the metal fitting on the energized side of the insulator chain at the front part of a cart capable of moving the insulator chain. Even when the energized part of the power transmission line is far away from the tower arm, the power transmission line and the tower arm can be reliably and safely short-circuited and grounded. In addition, a drum with an insulating chain wrapped around it is installed at the rear of the trolley, so it is safe to ensure insulation between the trolley and the tower arm until the voltage is detected using a voltage detector. Afterwards, the grounding wire can be sent out to ensure reliable continuity between the grounding hand and the electrically connected grounding metal fitting. Therefore, the present invention eliminates the conventional problems associated with this type of grounding work and greatly contributes to the development of industry.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the first embodiment of the present invention, Fig. 2 is a sectional view of the grounding hand portion thereof, Fig. 3 is a perspective view of the rear part of the trolley, and Fig. 4 is a perspective view showing the second embodiment of the invention. It is a perspective view showing an example. (1) Two trolleys, (7): Grounding hand, (11): Gas cylinder, (18): Grounding fitting, (19): Drum, (20): Grounding wire, (21): Insulated chain,
(28): Proximity sensor, (30): Insulating rod, (4
0): Insulator, (41): Metal fittings.

Claims (1)

[Scope of Claims] 1. A grounding hand (7) is provided at the front of the cart (1) that can move on the insulator chain (40) to grip the metal fitting (41) on the energized side of the insulator chain (40). , a grounding fitting (1) electrically connected to the grounding hand (7) is provided at the rear of the trolley (1).
a drum (19) with a drum (19) having a
has an insulated chain (20) connected to the rear of the
21) An automatic grounding device characterized by being wrapped around. 2. The trolley (1) is self-propelled and has a ground hand (7).
) detects the metal fitting (41) on the charging side (28).
) The automatic grounding device according to claim 1, which is equipped with: 3. The trolley (1) is connected to the insulator (40) by the insulating rod (30).
Claim 1, which is a manual type that is moved over the
Automatic grounding device as described in section. 4. Claim 1 or 2, wherein the ground hand (7) is of a type operated by a gas cylinder (11).
Automatic grounding device according to paragraph 3 or paragraph 3.