JPH0253334B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an in-pipe traveling body for running inside a pipe for the purpose of detecting corrosion in the pipeline.

Inspection pigs (pipe exploration devices) have been put into practical use for the purpose of detecting corrosion in pipelines. This type of device is moved inside the pipe by force-feeding or self-propelled, and performs an exploration along the way. However, when the purpose of the exploration is particularly to detect thinning of the pipe, it is necessary to closely cover the circumferential direction of the inside of the pipe. It is necessary to travel around the pipeline while taking measurements, and to explore the entire circumference and length of the pipeline.For this reason, conventional in-pipe vehicles are equipped with a large number of measuring instruments to closely measure the inner circumferential direction of the pipe. However, since measuring instruments for the purpose of this type of non-destructive testing are themselves expensive, conventional equipment that requires a large number of them is extremely expensive as a whole. However, it also consumes a large amount of electricity, so it is necessary to install a large number of batteries. Furthermore, due to the large number of measuring instruments and the large amount of batteries required for them, the volume of the traveling body itself becomes large, and as a result, the range of pipeline bends that can be passed through is limited to those with relatively small curvature. There is a drawback.

The present invention was devised in view of these conventional drawbacks, and aims to provide an in-pipe running body that enables accurate measurement with a small number of measuring devices. It consists of a pressure receiving cup rotatably attached to the outer periphery of the main body via a bearing, and a plurality of roller bodies attached in the circumferential direction of the main body for contacting the inner surface of the tube. It is designed to apply a rotational force in one direction to the main body by rolling on the inner surface of the tube as the traveling object moves.In this way, the measuring instrument is By actively rotating the mounted main body, precise measurements in the inner circumferential direction of the tube are possible with a small number of measuring instruments.

An embodiment of the present invention will be described below with reference to the drawings.

The traveling body of the present invention is composed of a main body 1 on which a measuring instrument is mounted, a pressure receiving cup 2 rotatably provided on the outer periphery of the main body, and a plurality of roller bodies 3 for contacting the inner surface of a tube.

The main body 1 has a cylindrical shape, and a measuring device (not shown) is usually attached to its outer periphery. Examples of this measuring device include a water immersion ultrasonic probe, an eddy current sensor Miles, and a leakage magnetic flux sensor. The pressure receiving cup 2 has an annular shape, and has two outer circumferences in the longitudinal direction of the main body.
It is rotatably mounted via a bearing 4. The pressure receiving cup 2 is made of a flexible member such as rubber, and its outer periphery is in close contact with the inner surface P of the pipe, and the traveling body receives the fluid pressure in the pipe by this pressure receiving cup 2 and the main body 1. It's starting to run.

A plurality of roller bodies 3 for abutting the tube inner surface are provided in the circumferential direction of the main body, and in this embodiment, the main body 1
They are provided at four locations in the circumferential direction via leg portions 5 provided at the rear of the. Each roller body 3 has a skew angle to each other and is held at an appropriate angle with respect to the traveling direction of the traveling body, and each roller body that comes into contact with the inner surface P of the tube when the traveling body advances moves the inner surface of the tube in a spiral shape. By rolling, the main body 1 integrated with the roller bodies 3 is rotated in one direction via the bearings 4. The mounting angle of the roller body 3 with respect to the traveling direction of the traveling body is preferably about 10 to 40 degrees.

In addition, in this embodiment, the roller body 3 is always connected to the tube inner surface P.
The leg portion 5 to which each roller body 3 is attached is configured to be rotatable relative to the main body 1, and the leg portion 5 and the main body 1 are connected by a spring 6. 6 pulls the leg portions 5 in a direction that spreads them, so that the roller body 3 is brought into pressure contact with the inner surface of the tube.

Such a device is positioned inside a pipe as shown in Fig. 1, receives fluid pressure from the direction of the arrow in the figure with its pressure receiving cup 2 and main body 1, is pumped through the pipe, and during this movement, the fluid inside the pipe is Only the main body 1 is rotated by the action of the roller body 3 that spirally rolls on the surface. During such driving, thinning measurements are carried out using a measuring device installed on the main body.
Since the main body 1 is constantly rotating while traveling, precise measurement in the circumferential direction is possible with a small number of measuring instruments.

According to the present invention described above, since the main body equipped with measuring instruments can be actively rotated while driving, circumferential direction measurement can be performed with a smaller number of measuring instruments, about 1/2 to 1/3 compared to conventional methods. It is possible to perform precise measurements, which allows the device itself to be provided at a low cost, and has the advantage of significantly reducing power consumption compared to conventional devices, and requiring only a small amount of batteries for the measuring device. . In addition, since the number of installed measuring instruments, batteries, etc. is small,
The traveling body itself can be made smaller, and even pipeline bends with large curvatures can be easily passed through, which has excellent effects not seen in the past.

[Brief explanation of drawings]

The drawings schematically show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional view, and FIG. 2 is a cross-sectional view of FIG.
It is an arrow view along a line. In the figure, 1 is a main body, 2 is a pressure receiving cup, 3 is a roller body, and 4 is a bearing.

Claims (1)

[Claims] 1 Consists of a main body to which a measuring device is attached, a pressure receiving cup rotatably attached to the outer periphery of the main body via a bearing, and a plurality of roller bodies attached in the circumferential direction of the main body for contacting the inner surface of the tube. A running body in a pipe, in which a body is attached at an angle to the traveling direction of the running body, and a rotational force in one direction is applied to the main body by rolling on the inner surface of the pipe as the running body moves.