JPS5832661B2 - Ultrasonic probe device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an ultrasonic probe device used when inspecting a material to be inspected for defects using ultrasonic waves.

When inspecting a material to be tested using ultrasonic waves, water is flowed between the probe and the material to be tested as an ultrasonic medium, but if this water flows out and remains on the material to be tested, It is an interval term.

That is, since many of the materials to be inspected are steel products, if water remains on the materials to be inspected after flaw detection, it may cause rust.

Furthermore, in surface wave flaw detection, when water flows out from between the probe and the material to be tested, ultrasonic waves propagate through the water, increasing attenuation and impeding flaw detection.

Therefore, in the past, methods such as compressing and blowing air to disperse the water that had flowed onto the material to be inspected were taken, but this was not possible and the water had to be wiped off after flaw detection.

This invention has been made to eliminate such problems.

By the way, in order to maintain a constant gap between the probe and the material to be tested, a method is generally used to mechanically maintain the gap by placing something called a shoe on the outer periphery of the probe in contact with the material to be tested. In this case, wear of the shoe surface at the contact surface between the surface of the material to be inspected and the shoe caused contact scratches on the surface of the material to be inspected.

Conventionally, this problem has been solved by forming a water film on the contact surface between the material to be tested and the shoe, and making it float, but the above-mentioned leakage of water to the outside is inevitable, and the surface It could not be used for wave flaw detection at all.

The present invention proposes a probe device that eliminates such problems.

Hereinafter, this invention will be explained in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a housing that covers five sides of the probe 2 except for the surface facing the specimen.

Reference numeral 3 denotes a shoe provided around the entire circumference of the housing, which has an air chamber 4 provided all around its interior, and which communicates with the air chamber 4 on the surface facing the test material. A plurality of holes 5 are provided, and air 10 sent from outside the probe device enters the air chamber 4 and is supplied from the holes 5 to the gap between the shoe 3 and the test material 7. .

Reference numeral 6 denotes a flow channel through which water sent from outside the probe device flows in order to form a water film 8 between the probe 2 and the test material 7, and is located on the surface of the housing 1 facing the test material 7. It is provided so as to cover five sides except for the outside, and is supplied from the outlet 9.

Further, a boundary groove is provided outside the outlet 9 on the surface of the shoe facing the material to be tested.

Since this device is configured as described above, the water film 8 formed during flaw detection can be applied to a plurality of minute particles with a diameter Q of 5 mm or less provided on the surface of the shoe 3 facing the test material 7. Due to the action of the compressed air supplied from the hole 5, an air layer of about 0.1 mm or less is formed at the interface between the shoe 3 and the test material 7,
At the same time, the shoe 3 is in a floating state between it and the surface of the material to be inspected, and at the same time, the entire circumference of the water film 8 is surrounded by an air layer with the boundary groove 10 as a boundary, so that water will not flow out to the outside.

Furthermore, the force of the air released from this air layer to the outer periphery of the shoe prevents dirt, scale, and other obstacles on the surface of the specimen from entering the interior, thereby reducing damage to the shoe and the probe.

Although a cylindrical probe is shown in the embodiment, it goes without saying that the present invention can be applied to other shapes as well.

[Brief explanation of the drawing]

1 and 2 show an embodiment of an ultrasonic probe device according to the present invention, in which FIG. 1 is a sectional view and FIG. 2 is a bottom view thereof, in which 1 is a housing, 2 is a probe, 3 is a shoe, 4 is an air chamber, 5 is a hole, 6 is a flow channel, 7 is a test material, 8 is a water film,
9 is an outlet, 10 is a boundary groove, 11 is a compressor, 12
13 is a filter, 13 is a pressure reducing valve, 14 is a flaw detector, 15 is a flaw detection cable, 16 is air piping, 17 is water piping, and 18 is compressed air. In the drawings, the same or corresponding parts are designated by the same reference numerals.

Claims (1)

[Claims] 1. An ultrasonic probe facing the test material at a predetermined interval, a housing that covers the surface of the probe other than the surface facing the test material, and a collar-shaped shoe provided on the outer periphery of the housing. , a plurality of microscopic holes provided on the surface of the shoe facing the test material, an air chamber communicating with the microscopic holes and provided inside the shoe, and an outer surface of the housing surrounding the probe. a flow channel provided in the flow channel, an outlet that passes through the flow channel and leads to the opposing gap between the test material and the probe, and a boundary groove provided between the outlet and the microhole so as to surround the outlet; Water supplied from outside the device passes through the above flow channel to form a water film between the probe and the specimen, and compressed air sent from outside the device passes through the air chamber and forms a water film between the probe and the sample. By flowing out from the holes, a minute air layer is formed at the interface between the shoe and the material to be tested, which acts to surround the entire circumference of the water film, preventing water from flowing out to the outside, and preventing the water from flowing out to the outside. An ultrasonic probe characterized in that, due to the action of an air layer formed at the interface of the test material, the shoe floats above the surface of the test material with a minute gap, resulting in a non-contact state between the shoe and the test material. Device.