JPH08168156A - Method for inspecting surface of insulator in plastic power cable - Google Patents

Abstract

PURPOSE: To obtain a clear image causing no erroneous recognition by blowing clean air through a first nozzle toward a part to be inspected on the surface of an insulator and then blowing clean air through a second nozzle toward the circumference of the clean air blown through the first nozzle. CONSTITUTION: A second nozzle 5 is disposed concentrically to a first nozzle 4 on the outside thereof. Clean air (a) is then blown through the nozzle 4 toward a part A to be inspected on the surface of a cable insulator 1 in order to remove dusts and the like from the circumference of the part A thus cleaning the part A. When the clean air (a) is blown out, the pressure drops in the periphery of blowing port of the nozzle 4 to bring about a state where the circumferential dusts can be entrained easily. In order to prevent the circumferential dusts from being entrained, clean air (b) is blown through a nozzle 5 to the periphery of the clean air (a) blown through the nozzle 4. Since the part to be inspected and the circumference thereof are cleaned, a clear image causing no erroneous recognition can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of projecting a scratch on a surface of a cable insulator or a foreign substance adhering to the surface of the cable insulator by using a photographing camera device in a terminal treatment of a plastic power cable. It is a thing.

[0002]

2. Description of the Related Art In the terminal treatment of a plastic power cable or the like, the surface of the cable insulator may be scratched by a blade or foreign matter such as dust may be attached to the surface of the cable insulator. is there. For this reason, a method has been adopted in which the photographing camera device is rotated around the cable insulator to inspect for any abnormality on the surface of the cable insulator. Although such an inspection is usually performed in a clean atmosphere, a clear image may not be obtained due to the influence of dust floating in the air, which may lead to misidentification.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above problems and provides a method for inspecting the surface of an insulator of a plastic power cable, which makes it possible to obtain a clear image without the risk of misidentification. Its feature is that it is located on the inner surface of the unit surrounding the cable insulator and rotatably around the cable insulator and movably in the cable axial direction, and is located outside the photographing camera device, the first nozzle and the first nozzle. Providing concentrically arranged second nozzles, the first nozzle blows clean air to the portion to be inspected on the insulator surface, and the second nozzle blows clean air around the clean air. It is to blow clean air.

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic explanatory view of an apparatus used in the inspection method of the present invention. In the drawings, reference numeral 1 is a cable insulator made of polyethylene, cross-linked polyethylene or the like, which is exposed by removing an outer coating or the like. Reference numeral 2 surrounds the cable insulator 1, and the cable insulator 1 is driven by a driving device (not shown).
It is a unit that rotates around and is installed so that it can move in the axial direction of the cable. On the inner surface of the unit 2, a photographing camera device 3 for photographing the inspected portion A of the cable insulator 1,
A first nozzle that blows clean air a to the portion to be inspected A and a second nozzle 5 that is located outside the first nozzle 4 and is arranged concentrically with the first nozzle 4 are provided.

Then, a separately provided electrostatically removed clean air supply device supplies clean air to the first and second nozzles 4 and 5 in the direction of the arrow, and the first nozzle 4 causes the clean air to flow over the insulator 1. By blowing the clean air a toward the inspected part A, the dust around the inspected part A is removed and cleaned. However, in this case, the pressure around the blowout port of the first nozzle 4 is lowered by the blowout of the clean air a, and dust around the blowout port is easily caught. Therefore, at the same time, the clean air b is blown around the clean air a blown from the second nozzle 5 through the first nozzle 4.
By blowing away the dust, it is possible to prevent the inclusion of dust from the surrounding area. In this way, the part to be inspected and its surroundings are cleaned,
It is possible to obtain a clear and good image without the risk of misidentification.

[0006]

As described above, according to the inspection method of the present invention, the first nozzle and the second nozzle are arranged concentrically, and the insulator is covered by the clean air blown by the first nozzle. A highly reliable inspection result can be obtained by cleaning the periphery of the inspection unit and blowing clean air from the second nozzle to prevent the inclusion of dust from the periphery.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of an apparatus used in an inspection method of the present invention.

[Explanation of symbols]

 1 Cable Insulator 2 Unit 3 Photographic Camera Device 4 First Nozzle 5 Second Nozzle

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kumagawa Kinya 1-3-3 Shimaya, Konohana-ku, Osaka-shi Sumitomo Electric Industries, Ltd. Osaka Works (72) Inventor Masao Matsumura Sanno Nakanoshima, Kita-ku, Osaka 3-2, 3-2 Kansai Electric Power Co., Ltd. (72) Inventor Yoshitaka Ichinose 3-3-22, Nakanoshima, Kita-ku, Osaka City Kansai Electric Power Co., Ltd.

Claims (1)

[Claims] 1. A unit which surrounds a cable insulator and is rotatably mounted around the cable insulator so as to be movable in the axial direction of the cable, is located outside the photographing camera device, the first nozzle, and the first nozzle. A second nozzle arranged concentrically with the above is provided, clean air is blown to the portion to be inspected on the surface of the insulator by the first nozzle, and the periphery of the clean air blown by the first nozzle by the second nozzle. A method for inspecting the surface of an insulator of a plastic power cable, characterized in that clean air is blown onto the surface.