JPS6239324Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe inspection device suitable for pipes, particularly helical coiled pipes.

A helical coiled tube 01 such as a helical coiled long heat transfer tube for various types of steam generators and condensers as shown in Fig. 1, and a helical coiled long piping for a chemical plant is subjected to ultrasonic flaw detection from its inner surface. In the case of non-destructive inspection, the normal flaw detection method is to rotate an ultrasonic or other flaw detection probe 02 inserted into the pipe at a constant speed using a small motor, and move it in the axial direction of the pipe at a constant speed using fluid pressure. The insertion speed is controlled by pressing the base of the cable 03 with a rubber roller and rotating this rubber roller to control the moving speed of the cable base. Since control is not performed at the tip, in an inspection device consisting of a flaw detection probe 02, a cable 03, and floats 04 attached to the cable 03 at regular intervals, the cable 03
The phenomenon of partial sagging of the pipe and subsequent rapid movement of that part, the so-called stake step, occurs, and the base and tip do not move in unison, resulting in uneven inspection of the actual pipe and the possibility of omitted inspection. There are also drawbacks.

In view of the above circumstances, the purpose of the present invention is to provide a device that moves an inspection probe at a constant speed inside a pipe to accurately inspect the inside of a pipe without any unevenness or leakage. to a flexible cable attached at equal pitches,
We propose an in-pipe inspection device characterized by comprising a self-propelled device equipped with magnetic wheels and a driving source thereof, and a piston and cylinder following the self-propelled device.

An embodiment of the present invention will be described with reference to FIG.
Reference numeral 1 denotes conveyance floats, which are attached to the cable 2 at equal pitches. The cable 2 is flexible and has a signal wire from the flaw detection probe 9 or a wire for operating the geared motor 5 for driving the rubber roller 3 of the self-propelled probe 6 running therein. Reference numeral 3 denotes a rubber tire having magnetic force, which is rotated by a geared motor 5 via a pair of bevel gears 4. Reference numeral 6 denotes a self-propelled probe which holds a geared motor 5 and is composed of rubber tires 3 and one shaft 1 of a pair of bevel gears 4. 7 is a buffer cylinder fixed to the float 1 following the self-propelled probe 6. Reference numeral 8 denotes a communication hole through which fluid in the cylinder enters and exits as the piston moves. 9 is a flaw detection probe; 11 is a connecting cable between the flaw detection probe 9 and the self-propelled probe 6; and 12 is a piston connected to the self-propelled probe 6, which has a buffering effect with the cylinder 7. Reference numeral 13 denotes a leaf spring provided on the self-propelled probe, which acts so that the rubber roller comes into contact with the inner wall surface of the tube 01.

When inspecting the inside of the tube 01 with the above configuration, the flaw detection probe 9 is moved by fluid pressure feeding and rotation of the rubber roller 3. If you do this, even if a status slip occurs,
The self-propelled probe 6 is always moved by the rotation of the rubber roller 3, and if it tries to move more rapidly, the sudden movement is avoided by the buffer provided by the cylinder 7 and piston 12 and the friction of the rubber roller 3. This prevents flaw detection from being missed due to sudden movement due to stake slap.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a heat exchanger tube and a flaw detection device for flaw detection, and FIG. 2 is a longitudinal cross-sectional view of one embodiment of the device of the present invention. 1: Float, 2: Cable, 3: Rubber roller,
5: Geared motor, 6: Self-propelled probe, 7:
Buffer cylinder, 12: Piston.

Claims (1)

[Scope of utility model registration request] A flexible cable with an inspection probe at its tip and multiple floats attached at equal pitches is interposed with a self-propelled probe equipped with magnetic wheels and its driving float, and a piston and cylinder following it. A pipe inspection device characterized by: