JPS63210658A - Rail-free type ultrasonic flaw detector - Google Patents

Abstract

PURPOSE:To facilitate the removal of a running truck from a piping to be inspected, by putting a wheel cap made of non-magnetic material detachably on a magnet wheel of a magnetic attraction type traveling mechanism. CONSTITUTION:Four magnet wheels 4a, 4b, 4c and 4d and two wheel driving motors 5a and 5b are mounted at the front, the rear, the right and the left of a running truck body 2. A scanning mechanism 6 of an ultrasonic probe 7 is provided on the running truck 1. For a flaw inspection of a piping, the magnet wheels 4a-4d are magnetically attracted to the circumference of the piping. Before removal of the running truck 1 from the piping, the magnet wheels 4a-4d are covered with wheel caps 10a, 10b, 10c and 10d made of non- magnetic material and turned by a half. This enables the weakening of a magnetic attraction force between the magnet wheels 4a-4d and the piping, thereby facilitating the removal of the running truck 1 from the piping.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention j (Industrial Field of Application) The present invention relates to a trackless ultrasonic flaw detection device that is applied to ultrasonic flaw detection of welded parts of piping and the like.

(Prior Art) Nuclear power plants are generally required to undergo periodic inspections every year, and during periodic inspections, ultrasonic flaw detection of piping is performed. In this case, an attempt has been made to perform ultrasonic flaw detection on the piping of the secondary cooling system using a trackless ultrasonic flaw detection device in order to reduce radiation exposure to workers.

As shown in FIG. 3, this trackless ultrasonic flaw detection device is equipped with a traveling vehicle 1 that can freely travel on piping (not shown). The suction type traveling has structure 3. This magnetic adsorption type traveling mechanism 3 has four magnets attached to the front, rear, left, and right sides of the traveling vehicle body 2.
And 211! ! The magnetic wheels 4a, 4b, 4C, 4d are attracted to the outer peripheral surface of a pipe (not shown) and rotated by the rotational force transmitted from the wheel drive motors 5a, 5b, The vehicle 1 is configured to run.

In addition, the traveling vehicle 1 is equipped with an ultrasonic probe scanner lil! 6 is provided. This ultrasonic probe scanning [11116 is composed of an ultrasonic probe 7, a screw rod 8, a probe scanning motor 5c, and a deceleration mechanism 9, and decelerates the rotational force of the probe scanning motor 5c'. The rotation of the screw rod 8 causes the ultrasonic probe 7 to move linearly in a direction intersecting the traveling direction of the vehicle 1. In the actual ultrasonic flaw detection, the ultrasonic probe 7 is reciprocated in the axial direction of the pipe while moving the vehicle 1 in the circumferential direction of the pipe (not shown).

(Problems to be Solved by the Invention) By the way, in such a trackless ultrasonic flaw detection device, the magnet wheels 4a and 4b.

Because the magnetic adsorption force between 4c and lj and the piping is strong, the traveling vehicle 1
When removing it from the piping, it cannot be easily removed, it takes time to remove it, and it has the disadvantage of poor handling.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a trackless ultrasonic flaw detection device that allows the traveling vehicle to be easily removed from the pipe.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a wheel cap made of a non-magnetic material that freely fits into the magnetic wheel of the traveling vehicle. It is characterized by the fact that it has been provided.

(Function) In other words, in the present invention, by covering the magnet wheel with a hubcap when the traveling vehicle is removed from the pipe, the magnetic adsorption force between the magnet wheel and the pipe can be weakened.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Note that the same parts in the figure as in the conventional example shown in FIG. 3 are given the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 1 is a perspective view showing an embodiment of the trackless ultrasonic flaw detection device according to the present invention, and in the figure, 10a and 10b are shown.

10c and 10d are bottomed cylindrical wheel caps used when removing the vehicle 1 from the piping. These wheel caps 10a, 10b.

10c and 10d are magnet wheels 4a, 4b, and 4C of the traveling vehicle 1, which are made of a non-magnetic material.

It has a structure that allows it to be removably fitted to 4d. Also, wheel caps 10a, 10b, 10c.

As shown in FIGS. 2(a) and 2(b), 10d has a wall thickness that gradually becomes thinner in the circumferential direction, and a notch 13 is provided at the thinnest portion. And wheel kits 10a, 10b, 10c.

An uneven part 14 with a jagged pattern is formed on the bottom surface of the magnet wheels 4a and 4b.

It is designed to engage with the uneven portions 15 provided on the end faces of 4c and 4d. Moreover, handles 11a and 11b for lifting the traveling vehicle 1 are attached to the traveling vehicle body 2, and a wheel drive motor 5a is attached to these handles 11a and 11b.
, 5b are provided.

When conducting an ultrasonic flaw detection inspection of piping using this apparatus configured as described above, first, the traveling vehicle 1 is installed on the piping (not shown), and the magnetic wheel 4a is placed on the piping.

The wheel drive motors 5a, 5b are driven with the magnet wheels 4b, 4c, 4d magnetically attracted to the outer peripheral surface of the piping, thereby rotating the magnet wheels 4a, 4b, 4c, 4d. Then, while moving the traveling vehicle 1 in the circumferential direction of the pipe, the ultrasonic probe 7 is reciprocated in the axial direction of the pipe by the ultrasonic probe scanning mechanism 6, thereby performing ultrasonic flaw detection.

Moreover, when removing the traveling vehicle 1 from the piping, first remove the wheel kits 10a, 10b, and 10c.

10d is magnet wheel 4a, 4b, 4c.

At this time, the notches 14 of the wheel caps 10a, 10b, 10c, and 10d are placed over the magnet wheels 4a, 4b, and 4c.

When the wheel caps 10a, 10b, 10c, and 10d are positioned at the contact portions between the wheel caps 4d and the pipes, the wheel caps 10a, 10b, 10c, and 10d can be easily fitted into the McNet wheels 4a, 4b, 4C, and 4d.

Also, wheel caps 10a, 10b.

lQc, 10d are magnet wheels 4a, 4b.

4c and 4d, grasp the handles 11a and 11b provided on the vehicle body 2 and turn the switch 12a.

12b to drive the wheel drive motors 5a, 5b to drive the magnet wheels 4a, 4b, 4C.

Turn 4d half a turn. At this time, the wheel cap 10a
, 10b, 10c, uneven portions 1 provided on the bottoms of 10b.
4 are magnet wheels 4a and 4b.

The wheel caps 10a and 10b engage with the uneven portions 15 provided on the end faces of the wheels 4C and 4d.

10c and 10b are magnet wheels 4a and 4b.

Rotating together with 4G and 4d, the wheel cap 10a,
The thickest parts of 10b, 10c, and 10b are magnet wheels 4a, 4t), and 4C.

It will be located between 4d and the pipe. This creates a magnetic gap between the magnet wheels 4a, 4b, 4C, 4d and the piping, and the magnet wheels 4a, 4C, 4d
b, 4C, and 4d, the magnetic adsorption force of the pipe tonnage is weakened, so the traveling vehicle 1 can be easily removed from the pipe by lifting the handles 11a and 11b.

[Effects of the Invention] As explained above, according to the present invention, the wheel caps 10a and 10b are made of a non-magnetic material.

10c and 10d are the magnetic wheels of car 1 4 a
, 4 b , 4 G , 4 d NiMl Serukoto ICJ: '), Magnet wheels 4a, 4b,
Since the magnetic adsorption force between 4G and 4d and the piping can be weakened, the traveling vehicle 1 can be easily removed from the piping, and a trackless ultrasonic detection device that can be easily removed from the piping can be provided. .

[Brief explanation of the drawing]

Fig. 1 and Fig. 2 show an example of the actual flow of the present invention, Fig. 1 is a perspective view showing a trackless ultrasonic probe (I!8 position) according to the present invention, and Fig. 2 (a) is 1 is a partially sectional front view of a hubcap, FIG. 3(b) is a sectional view taken along arrow B-8 in FIG. 3(a), and FIG. ... Running car, 2... Running car body, 48-4d...
・Magnet wheel, 5a, 5b...Wheel drive motor, 7...Ultrasonic probe, 10a-10d...
・Wheel cap. Applicant's agent Patent attorney Takehiko Suzue (a) Figure 2

Claims (1)

[Claims] A traveling vehicle body, a plurality of magnet wheels attached to the traveling vehicle body and magnetically attracted to the outer circumferential surface of the piping to be inspected, a wheel drive motor for driving the magnetic wheels, and a superstructure provided on the traveling vehicle body. a sonic probe,
It includes an ultrasonic probe scanning mechanism that linearly moves the ultrasonic probe in a direction intersecting the traveling direction of the vehicle body, and a wheel cap made of a non-magnetic material that is removably fitted to the magnetic wheel. A trackless ultrasonic flaw detection device that is characterized by: