JPH0142033Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ultrasonic flaw detection probe used in non-destructive testing to detect defects inside a material.

In ultrasonic flaw detection using the conventional direct contact method, the probe body is in direct contact with the test surface, or a guide shoe attached to the probe body is brought into contact with the test surface and the bottom surface of the probe body is Scanning was performed with a certain gap between the test surface and the test surface.

However, when the probe is scanned in such a state, wear of the bottom surface of the probe body or the guide shoe, etc., which is in direct contact with the test surface is unavoidable. In addition, undulations or localized protrusions (e.g., formed by weld spatter or scale) on the test surface may cause the transducer to scan with less smoothness and thus be less reliable. Therefore, it is not possible to conduct a flaw detection inspection.

In order to solve this problem, we installed multiple high-pressure water outlets in the container that houses the probe, and used a non-contact method that sprays water from these outlets to lift the probe above the test surface. Although a type of ultrasonic flaw detection probe has been devised, conventional non-contact type ultrasonic flaw detection probes cause water to flow out from the discharge port and cause problems in the working environment. This method has the disadvantage of causing deterioration of the flaw detection sensitivity, and the disadvantage of reducing flaw detection sensitivity if air bubbles adhere to the transmitting/receiving surface of the probe due to air entering the water supply piping system, etc. .

Therefore, the purpose of this invention is to eliminate the above-mentioned drawbacks of the conventional methods, and to enable highly accurate flaw detection through smooth scanning without causing wear on the probe body and its accessories, and without causing deterioration of the working environment. An object of the present invention is to provide an ultrasonic flaw detection probe that can perform the following steps without reducing flaw detection sensitivity.

The ultrasonic flaw detection probe according to the present invention consists of a probe body and a holder that surrounds and holds the side surface of the probe body, and the holder includes:
It has an internal flow path in which a liquid that can be used as a medium between the probe body and the test surface of the material to be inspected, such as water or oil, is inserted into the flow path. It has an inlet opening for entering the interior of the holder from the source. The inlet opening is in communication with an external liquid source by a hose. The flow path further communicates with an injection flow path that communicates with an injection port opening at the bottom of the holder. Therefore, by injecting the liquid supplied from the outside toward the test surface from the injection port at the bottom, the probe body and the holder float above the test surface. Therefore, the bottom surface of the probe body can be maintained at a constant distance from the test surface.

A plurality of the injection flow path sections are arranged, and one part extends vertically downward, and the other part extends obliquely downward with respect to the bottom of the probe body, and each communicates with the injection port. The jet flow from the part extending vertically downward mainly serves to float the probe, and the jet flow from the part extending obliquely downward mainly serves to actively spread the liquid medium between the probe body and the test surface. It acts to supply.

The holder includes a skirt portion surrounding the outside of the injection port near the outer peripheral edge of the bottom surface of the holder. Because of this skirt portion, the injection pressure can be applied effectively and the liquid used as a medium can be prevented from flowing out.

By having the present invention configured as described above, the above object can be achieved. Further, the ultrasonic flaw detection probe according to the present invention can be used as a flaw detection probe in either the reflection method or the transmission method. Furthermore, the ejected liquid can be collected and used repeatedly.

Next, a preferred embodiment of the invention shown in the accompanying drawings will be described.

As shown in FIGS. 1 and 2, the ultrasonic flaw detection probe according to the present invention includes a probe body 1 and a holder 2 surrounding the side surface of the probe body 1. As shown in FIGS. The probe body 1 is attached to a holder 2 by a gimbal mechanism (not shown). Four supply tube sections 3 are provided on the upper surface of the holder 2, each having an inlet opening 4. As shown in FIG. 1, a hose 5 is attached to the supply pipe section 3, through which liquid is pumped from a liquid source (not shown) through an inlet opening 4 to a liquid path to be described later. The liquid source at this time may be provided in a part of the circulation channel system. The inlet opening 4 communicates with a flow path 6 provided within the holder 2. Channel 6
extends in an annular shape along the shape of the holder 2, is provided inside the holder 2 so as to surround the periphery of the probe body 1, and communicates with a plurality of jet flow passages 7 extending downward. are doing.

As shown in detail in FIG. 3, the injection flow path section 7 consists of a vertical flow path section 7a and an oblique flow path section 7b, each of which has an injection port 8 opened at the bottom of the holder 2.
have. Diagonal flow path portion 7b of each injection flow path portion 7
extends toward the bottom of the probe body 1.

A skirt portion 9 is provided near the outer peripheral edge of the bottom surface of the holder 2 so as to surround the outside of the injection port 8.

When performing flaw detection using the ultrasonic flaw detection probe according to the present invention, the probe is first placed on the test surface of the material to be inspected (not shown), and the liquid medium pumped from the liquid source is pumped through the hose 5. into the holder 2 through the The liquid medium fed into the inlet opening 4,
The liquid is injected from the injection port 8 toward the test surface via the flow path 6 and the injection flow path section 7. Therefore, the probe body 1 and the holder 2 float away from the test surface due to this injection pressure. By adjusting the pressure of the liquid medium to be pumped, it is possible to maintain an arbitrary distance between the probe 1 and the bottom of the holder 2 and the test surface. At this time, the skirt portion 9 functions so that the injection pressure can be used effectively.
The bottom of the skirt portion 9 is also placed in a floating state away from the test surface. Furthermore, this skirt portion 9 acts to suppress the outflow of the liquid medium to the outside, thereby making it possible to maintain a good working environment.

The force for floating the ultrasonic flaw detection probe is mainly given by the injection pressure from the injection port 8 of the vertical flow path section 7a. On the other hand, the injection pressure from the injection port 8 of the diagonal flow path section 7b provides assistance to float the probe, but its main role is to actively spread the liquid medium between the bottom surface of the probe body 1 and the test surface. Our aim is to supply
As a result, the liquid medium is sufficiently spread between the bottom surface of the probe body 1 and the test surface, so that even if air bubbles adhere to the bottom surface of the probe body 1, that is, the transmitting/receiving surface, this will be prevented. Since it can be removed quickly, the flaw detection sensitivity will not be reduced.

As explained above, the ultrasonic flaw detection probe according to the present invention can scan with the probe and holder floating above the test surface, so any part of the ultrasonic flaw detection probe can touch the test surface. Since there is no contact, there is no need for wear.

In addition, even if there are undulations or local protrusions on the test surface, if these are less than the distance between the bottom of the probe and the test surface, the probe will be able to scan over them. I can do it. Therefore, smooth scanning is possible without being affected by undulations or local protrusions on the test surface, and highly accurate flaw detection can be performed.

Since the holder is equipped with a skirt near the outer periphery, the injection pressure can be applied effectively, and the liquid used as a medium can be prevented from flowing out, keeping the working environment in good condition. be able to.

Moreover, the holder is formed with a diagonal flow path section that extends diagonally downward toward the bottom of the probe body, actively creating a liquid medium between the transmitting/receiving surface of the probe and the test surface. can be supplied, so there is no possibility that the flaw detection sensitivity will decrease.

Furthermore, since the probe is floating, it is expected that only a small amount of driving force will be required for scanning.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of an ultrasonic flaw detection probe according to the present invention. Figure 2 is - of Figure 1.
FIG. FIG. 3 is a cross-sectional view of FIG. 1. 1: Probe body, 2: Holder, 3: Supply pipe section,
4: Inlet opening, 6: Channel, 7: Injection channel section, 8:
Nozzle, 9: Skirt part.

Claims (1)

[Scope of utility model registration request] An ultrasonic flaw detection probe consisting of a probe body and a holder surrounding the side surface of the probe body and holding the probe body, wherein the holder is a flow path surrounding the probe body;
an inlet opening for introducing fluid from a fluid source into the flow channel; a supply pipe section that communicates the inlet opening and the flow channel; and a plurality of injection ports opening at the bottom surface of the holder, each of which includes: an injection flow path formed to communicate the flow path with the injection port and having a vertical flow path portion extending vertically downward and an oblique flow path portion extending diagonally downward toward the bottom of the probe body; 1. An ultrasonic flaw detection probe comprising: a skirt portion surrounding the outside of the injection port near the outer periphery of the bottom surface of the tool.