JPH0715283Y2 - Lifting platform for maintenance and inspection work of insulators in substations - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating stand for maintenance and inspection work of an insulator that connects and holds a high voltage overhead power transmission line in a substation.

[0002]

2. Description of the Related Art In a substation, when the electric power transmitted through a high voltage overhead power transmission line is relayed to a cable for underground power transmission as needed, or when branch distribution is performed, a terminal is used. As a large-scale insulator is installed.

For example, as in the case of underground power transmission shown in FIG. 7, a base 50 installed on the ground has an insulator 5 as a terminal.
1 is provided, the end of the high voltage overhead power transmission line 53 and the end of the underground wire consisting of the insulated cable 54 are connected to the fixed terminal 52 provided on the top thereof, and the insulated cable 54 is connected to the insulator 51.
It is introduced into an underground pipe (not shown) through the central hole of the power distribution line and distributed to the required area.

Although the insulator 51 is regularly inspected and maintained, the following means have been conventionally used for the work. That is, after stopping the power transmission, (a) as shown in FIG. 8, the ladder 55 leaning against the insulator 51 is fixed to the insulator 51 with a rope 56 or the like.

In this case, since the weight of the ladder 55 and the operator who climbs up to the ladder 55 and works on the insulator 51 is applied to the insulator 51, a bending load is applied to the mounting portion of the base 50 and the insulator 51, which is preferable. In addition, since there is no work, and the work is done by climbing to the ladder 55, there is a problem that the work is difficult due to poor scaffolding, a lot of time is required, and a blackout time is prolonged.

(B) As shown in FIG. 9, two ladders 55 standing on both sides of the insulator 51 are connected by a connecting member 57. In this case, since two people work, the working time is shortened, and no bending load is applied to the mounting portion of the base 50 and the insulator 51, but the point of poor scaffolding is the same as above. There was a problem that reliable maintenance could not be performed.

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention eliminates the drawbacks of the lifting platform for the maintenance and inspection work of the insulator, which is connected to and holds the high voltage overhead transmission line in the substation, as shown in the prior art. An elevator with a flat scaffold for the insulator is installed on the base to enable reliable and quick work with a stable posture, and one elevator drive device can be installed appropriately according to maintenance inspection. The purpose is to provide a mount.

[0008]

Means for Solving the Problems The present invention relates to a fixed base provided on an upper part of a ground-based base on which an insulator is mounted and fixed as a terminal for relaying high voltage overhead transmission power, and to the fixed base. Lifting up and down via a pantograph and a lifting platform equipped with a flat landing surrounding the insulator, and a hydraulic cylinder that is detachably set on the fixed platform and moves up and down the pantograph, and via the hydraulic cylinder and a flexible tube. The lifting table is connected to a hydraulic unit installed on the ground, and a lifting drive device is provided.
Equipped with a lifting ladder that complements the fixed ladder attached to the stand
It is characterized by consisting of.

[0009]

According to the structure of the present invention, at the time of maintenance and inspection work, the hydraulic cylinder is mounted on the fixed base, the hydraulic cylinder and the hydraulic unit on the ground are connected by the flexible pipe, and the hydraulic unit is operated to move up and down to the lower position. The platform can be raised by a pantograph to form a flat landing at a position surrounding the insulator, and it is possible to work safely and efficiently on this landing. In addition, the lifting platform complements the fixed ladder of the fixed platform.
As it is equipped with a lifting ladder, it is easy to climb up and down.
The handrail that can be tilted up and down can increase safety.
It

[0010]

Embodiments of the present invention will be described with reference to the drawings.
FIGS. 1 (A) and 1 (B) show the rising and lowering stage according to the present invention, in which a support member 3 is provided on a side surface of a base 2 installed on the ground on which an insulator 1 as a terminal is mounted and fixed. Fixed ladder 4
Is installed.

A is an elevating base, and the elevating base A is a rectangular fixed base 5 provided on the upper part of the base 2, and the fixed base 5.
A pair of pantographs 6 provided on opposite sides of the, a rectangular lifting platform 7 attached to the pantograph 6, a tiltable handrail 8 and a lifting ladder 9 provided on the lifting platform 7,
It is composed of a pair of hydraulic cylinders 10 detachably attached to the fixed base 5, and a hydraulic unit 12 (including a hydraulic pump and a switching valve) connected to the hydraulic cylinder 10 via a flexible pipe 11. .

As shown in FIG. 3, the rectangular fixed base 5 has rectangular frames 5b fixed to a pair of support members 5a attached to the upper part of the base 2, and the rectangular frames 5b are fixed. The joint material 5c is connected to the end portion. Each of the pantographs 6 is composed of a pair of arms 6a (see FIG. 1 (B)), and is pivotally attached to a central shaft 6b and an end shaft 6c, and one lower end of the arm 6a is a rectangular frame of the fixed base 5. 5b is pivotally attached, and the other lower end is slidably supported by an arm guide plate 5d provided on the rectangular frame 5b.

As shown in FIG. 4, the rectangular lifting platform 7 has
A rectangular frame 7 for each pair so as to surround the insulator 1.
The upper end of the arm 6a of the pantograph 6 is pivotally attached to the rectangular frame 7b, and the other upper end is slidably supported by the arm guide plate 7c provided on the rectangular frame 7b.

A wire net or a steel plate is attached to each of the rectangular frames 7a and 7b, and a flat landing 7d serving as a scaffold for working is formed around the insulator 1. The handrail 8 is provided on the outer circumference of each of the rectangular frames 7a and 7b so as to be able to be erected by a hinge or the like, and a spring-biased rod provided on the handrail 8 is provided on the rectangular frames 7a and 7b, which is not shown during work. It is designed to be inserted into a receiving pipe to maintain the standing state.

The elevating ladder 9 supplements the length of the fixed ladder 4.
Is intended to complete, attached to the support member 7e of the upper is provided in a rectangular frame 7a, downward of the fixing base 5 Tsugizai 5c
It is inserted into the ladder anti-vibration member 5e provided on the upper end of the elevating table 7, and the lower end of the elevating table 7 is set to face the upper end of the fixed ladder 4. Although a handrail 9a that can be raised and lowered by the same means as the handrail 8 is attached to the upper end of the elevating ladder 9, this raising and lowering means can take other appropriate means.

As shown in FIG. 5, the hydraulic cylinder 10 is provided with a pair of bibots 10a projecting upward, and each of the bibots 10a is provided on a rectangular frame 5b of a fixed base 5 as shown in FIG. The piston rod 1 of the hydraulic cylinder 10 is detachably fitted into the locking groove 5g of the receiving member 5f.
0b is a pair of arms 6a of the pantograph 6
It is adapted to be fitted into the receiving member 6d mounted and fixed between.

The hydraulic unit 12 together with the hydraulic cylinder 10 and the flexible tube 11 constitute a single lifting drive device. Further, although the fixing table 5 and the lifting table 7 are shown as the rectangular embodiments, they may be formed in a circular shape surrounding the top of the base 2 and the insulator 1.

Next, the operation will be described. (A) Normal state As shown in FIG. 2, the lifting table 7 and the lifting ladder 9 bend the pantograph 6 by its own weight to descend, and also the lifting table 7
The handrails 8 and 9a of the elevator ladder 9 are tilted outward.

(B) During maintenance / inspection work (a) After stopping the power transmission, the lifting drive device for the hydraulic cylinder 10, the flexible tube 11 and the hydraulic unit 12 is brought in, and the vivot 10a of the hydraulic cylinder 10 is fixed to the vivot of the fixed base 5. The hydraulic cylinder 10 is set by fitting it into the locking groove 5g of the receiver 5f, and is connected to the hydraulic unit 12 placed on the ground by the flexible tube 11.

(B) The hydraulic unit 12 is operated to send pressure oil to the hydraulic cylinder 10 through the flexible tube 11 to extend the piston rod 10b and raise the lifting platform 7 to a desired position. (C) A worker ascends the elevating ladder 9 from the fixed ladder 4, raises the handrail 9a and rides on the landing 7d of the elevating stand 7 and raises the handrail 8 (FIGS. 1 (A) and (B)). .

(D) The worker is on the landing 7 surrounding the insulator 1.
Perform the maintenance and inspection work of the insulator 1 on d (the scaffolding is good and there is the handrail 8 that also prevents the fall). The lift table 7 moves up and down to the work position by the operation of the hydraulic cylinder 10.

(C) At the end of work (a) The worker tilts the handrail 8 outward and moves it from the lift table 7 to the lifting ladder 9, and tilts the handrail 9a outward to lift the ladder 9
From the fixed ladder 4, go down to the ground. (B) Actuating the hydraulic unit 12, the hydraulic cylinder 10
The pressure oil inside is released to release the bias of the piston rod 10b.

(C) The elevating table 7 and the elevating ladder 9 bend the pantograph 6 by its own weight to descend (state of FIG. 2). (D) Restart power transmission.

[0024]

[Effect of device]

(A) Since an elevator that has a flat landing with good footing around the insulator is installed on the base, reliable and quick maintenance and inspection work can be performed with a stable posture of the worker, and a large amount of work time is required. By shortening, the power outage time can be shortened as much as possible. (B) During maintenance and inspection work, the hydraulic cylinder and hydraulic unit are brought in and the hydraulic cylinder is set on the fixed base, so work preparation is simple and even when there are multiple insulators in the same substation. The above-mentioned lifting drive device can be shared by one, which is economical. (C) Further, since the lifting platform is provided with a lifting ladder to complement the fixed ladder of the base, it is easy to climb up and down the platform.

[Brief description of drawings]

1A and 1B show an embodiment of the present invention, in which FIG. 1A is a front view of a lifting platform when it is raised, and FIG.

FIG. 2 is a front view of the lifting table according to the present invention when the table is lowered.

FIG. 3 is a plan view of a fixing base according to the present invention.

FIG. 4 is a plan view of the lifting table according to the present invention.

FIG. 5 is a front view of a hydraulic cylinder according to the present invention.

FIG. 6 is an explanatory view of a mounted state of a hydraulic cylinder according to the present invention.

FIG. 7 is an explanatory diagram of underground power transmission.

FIG. 8 is an explanatory diagram of a conventional work.

FIG. 9 is an explanatory diagram showing another conventional example.

[Explanation of symbols]

 1 Insulator 2 Base 4 Fixed Ladder A Lifting Platform 5 Fixed Stand 6 Pantograph 7 Lifting Platform 7d Landing 8 Handrail 9 Lifting Ladder 10 Hydraulic Cylinder 11 Flexible Tube 12 Hydraulic Unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Misao Hirats 1-12-3 Hamamatsucho, Minato-ku, Tokyo Sanwa Koki Co., Ltd. (72) Atsuhiko Uchiyama 1-1-12 Hamamatsucho, Minato-ku, Tokyo No. 3 Sanwa Koki Co., Ltd. (72) Inventor Hiroyuki Hakomori 1-12-3 Hamamatsucho, Minato-ku, Tokyo No. 3 Sanwa Koki Co., Ltd. (72) Inventor Shiro Shimizu 1-chome, Hamamatsucho, Minato-ku, Tokyo No. 12-3 Sanwa Koki Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A fixed base provided on an upper part of a ground-based base on which an insulator as a terminal for relaying high-voltage overhead transmission power is mounted and fixed, and a fixed base is moved up and down via a pantograph, An elevating table equipped with a flat landing surrounding an insulator, a hydraulic cylinder that is detachably set to the fixed table, and that raises and lowers the pantograph, is connected to the hydraulic cylinder via a flexible tube, and is installed on the ground. The lifting table is equipped with a hydraulic unit and a lifting drive device.
A fixed ladder attached to the fixed table together with a handrail that can be collapsed
A lifting platform for maintenance and inspection work, characterized by comprising a lifting ladder that complements the child .