JPH0328376Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is an ultrasonic probe that performs flaw detection by scanning in a spiral manner while rotating an ultrasonic probe around a tubular or round bar-shaped test material that is being conveyed in a straight line. This relates to sonic flaw detection equipment.

[Conventional technology]

FIG. 3 is a cross-sectional view showing a conventional ultrasonic flaw detection device, in which 1 is an ultrasonic probe (hereinafter referred to as a probe), 2 is an outer cylinder holding the probe 1,
3 is a water supply port for sending water for ultrasonic propagation into the inside of the outer cylinder 2; 4 is a casing attached to both ends of the outer cylinder 2; 5 is a tube-shaped or round bar-shaped water inlet inscribed in the casing 4; an inner cylindrical body having a space through which the test material passes; 6 a water chamber surrounded by the outer cylindrical body 2, the casing 4, and the inner cylindrical body 5;
Reference numeral 7 indicates a water inlet provided in the inner cylindrical body 5 directly below the probe 1, 8 indicates a water column for ultrasonic propagation formed from the water chamber 6 through the water inlet 7, and 9 indicates a tubular or round water column. This is a rod-shaped test material (hereinafter referred to as test material).

The conventional device is configured as described above, and water for ultrasonic propagation is supplied from the water supply port 3 to the specimen 9 being transported in a straight line while the ultrasonic flaw detection device is rotated by a rotating machine (not shown). The ultrasonic waves emitted from the probe 1 are propagated to the test material 9 via the water chamber 6 and the water column 8, and the test material 9 is scanned in a spiral manner for flaw detection. .

[Problem that the invention attempts to solve]

The conventional ultrasonic flaw detection apparatus as described above has the following problems.

The conventional ultrasonic flaw detection device is used to test the test material 9 using a rotating machine.
When rotating at high speed around the ultrasonic wave, centrifugal force acts on the water column 8 for ultrasonic propagation. The water column 8 does not reach the test material 9,
There were cases in which the ultrasonic waves emitted by the probe 1 were not propagated to the test material 9.

From this, in order to reduce the height of the water column 8, the gap between the inner diameter of the inner cylinder 5 and the outer diameter of the specimen 9 can be kept to a very small value, and therefore the ultrasonic wave Test material 9 passing through the flaw detection device
There was a problem in that the roundness, straightness, and amount of deflection during transportation had to be strictly regulated.

This invention was made in order to solve this problem, and allows the probe 1 to be moved around the specimen 9 without having to strictly control the circularity and straightness of the specimen 9, as well as the amount of deflection during transportation. The object of the present invention is to obtain an ultrasonic flaw detection device that enables ultrasonic flaw detection while rotating around the rotation axis 9.

[Means for solving problems]

The ultrasonic flaw detection device according to this invention is equipped with a plurality of balance weights that fit into grooves provided in the casing and a ring inscribed in the material to be inspected, further outside the casing at both ends of the water chamber. .

[Effect]

In this design, the ring is displaced in the radial direction and follows the bending of the material to be inspected and the vibrations during transportation.
It acts as a weir to form a stable water chamber.

〔Example〕

1 and 2 are cross-sectional views showing one embodiment of this invention, and 1 to 5, 7, and 9 are completely the same as the conventional device.

6 is exactly the same as the conventional device, but in the present invention it is called the first water chamber.

Numeral 10 indicates a plurality of grooves (hereinafter referred to as grooves) provided in the casing 4 and having the shape of elongated holes in the radial direction.
11 fits into the groove 10 above, and the groove 10
multiple circular balance weights that slide in the radial direction (hereinafter referred to as balance weights),
12 has an inner diameter inscribed in the test material 9 and has an annular space larger than the outer diameter of the balance weight 11 in a part thereof, and the balance weight 11 is placed in this annular space (hereinafter referred to as ring) ), 13 is a cover that is attached to the casing 4 and houses the balance weight 11 and the ring 12 between it and the casing 4; 8 is a cover that is attached to the inner cylinder 5, the ring 12, and the specimen 9; A second water chamber is thus formed and surrounded.

In the ultrasonic flaw detection device configured as described above, when the ultrasonic flaw detection device is rotated by a rotating machine (not shown), the balance weight 11
receives a circular force due to this rotation, moves in the radial direction along the groove 10, and stops at the position where the balance weight 11 touches the end of the groove 10, and because it receives centrifugal force, it remains stopped at that position. It's rotating. At this time, the ring 12 is in such a relationship that the outer diameter of the annular space, which is larger than the outer diameter of the balance weight 11 that a part of the ring 12 has, is inscribed in the balance weight 11 in the stopped state.
This balance weight 11 holds it at the center of rotation.

The radius and weight of the balance weight 11 and ring 12 are determined so that the centrifugal force applied to the balance weight 11 is sufficient to hold the ring 12.

When the test material 9 is carried into the ultrasonic flaw detection apparatus in such a state, even if the test material 9 is bent or shakes during transportation, the ring 12 inscribed in the test material 9 will not move upward. As explained above, the specimen 9 is held in the air by the centrifugal force of the balance weight 11 and is not mechanically fixed.
The ring 12 is displaced in the radial direction and follows the bending and vibration during transportation. When the test material 9 passes through the ultrasonic flaw detection device, the ring 12 no longer displaces or follows, and the ring 12 is held at the center of rotation by the balance weight 11 again.

At this time, if the inner hole of the ring 12 is formed in a round shape as shown in FIG. 1, the test material 9 can be carried into, taken out, and conveyed more smoothly into this apparatus.

In the ultrasonic flaw detection device as explained above, while rotating this device at high speed, water for ultrasonic propagation is sent from the water supply port 3 to form the first water chamber 6 and the second water chamber 8. Ultrasonic waves emitted from the sample 1 pass through the first water chamber 6 and second water chamber 8 to the specimen 9.
It is propagated and flaw detection is carried out.

A centrifugal force acts on the water for ultrasonic propagation, but if the amount of water leaking from the second water chamber 8 is less than the amount of water supplied from the water supply port 3, the amount of water leaking from the first water chamber 6 and the water supply port 7 is , water is held in the second water chamber 8, and in the ultrasonic flaw detection device according to this invention, the second water chamber 8 is surrounded by the inner cylindrical body 5, the ring 12, and the test material 9. Because of this, the ring 12 acts as a weir, and because the ring 12 displaces and follows the bending of the material to be inspected and the vibrations during transportation,
Water can be retained reliably. Therefore, the ultrasonic waves emitted from the probe 1 are reliably propagated to the test material 9, and flaw detection can be performed.

[Effect of idea]

As explained above, by holding the ring with a balance weight that utilizes centrifugal force, the radial displacement of the specimen is absorbed, and the ultrasonic wave is generated between the probe and the specimen. Since the water for propagation is reliably retained, there is an effect that stable flaw detection can be performed.

In other words, the problem of having to strictly control the roundness, straightness, and amount of deflection during transportation of the test material passing through the conventional ultrasonic flaw detection equipment is eliminated, and the It has become possible to significantly reduce manufacturing accuracy and the amount of vibration during transportation.
The area in which ultrasonic flaw detection can be performed is greatly increased, and there are also effects such as the need for equipment such as peach rolls for holding down the tubular or round rod-shaped test material in terms of transportation equipment.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of this invention, Fig. 2 is a sectional view showing a balance weight part of an embodiment of this invention, and Fig. 3 is a sectional view showing a conventional ultrasonic flaw detection device. . In the figure, 1 is an ultrasonic probe, 2 is an outer cylinder, and 3 is an ultrasonic probe.
is a water supply port, 4 is a casing, 5 is an inner cylinder body, 6 is a first water chamber, 7 is a water inlet, 8 is a second water chamber, 9 is a test material, 10 is a groove, 11 is a balance weight, 1
2 is a ring, and 13 is a cover. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In an ultrasonic flaw detection device that scans the outer periphery of the test material in a spiral manner using an ultrasonic probe that rotates around a tubular or round bar-shaped test material that is transported in a straight line, the ultrasonic probe an outer cylinder for holding the body, an inner cylinder provided within the outer cylinder and having a space for passing the test material, and a first water chamber formed between the outer cylinder and the inner cylinder. and an end member that closes the openings at both ends thereof, and a cover ring is provided that is attached to each end of the box and forms an annular space between the end faces of the box, and the above-mentioned a plurality of balance weights attached to an annular space so as to be movable in the radial direction by centrifugal force; and a ring held by the balance weights and having a hole having an inner diameter smaller than the inner diameter of the inner cylinder and through which the test material passes. A second water chamber is formed by the inner cylindrical body, the ring, and the test material, and the first water chamber and the second water chamber are placed in predetermined positions of the inner cylindrical body. A communication hole is provided for communicating the ultrasonic probe from the ultrasonic probe in the direction of the test material and for supplying water from the first water chamber to the second water chamber. Ultrasonic flaw detection equipment.