JPH0562856U - Ultrasonic flaw detection probe - Google Patents

Abstract

(57) [Summary] [Purpose] When the probe is brought into contact with the curved surface of the subject,
Try to be dense. [Structure] A probe having a curved shape for detecting damages and defects of a subject, and a plastic member is detachably attached to the probe portion of the probe so as to closely contact the curved shape portion of the subject. Attach to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ultrasonic flaw detection probe applicable to a subject having a curved surface shape.

[0002]

[Prior Art]

 The ultrasonic flaw detection method, which is one of the non-destructive inspection methods for various metal structures, is widely used because it is relatively easy to operate and has relatively high flaw detection accuracy as a flaw detection method for internal defects.

This flaw detection method is often used even in a hydraulic machine having a relatively large number of curved surfaces such as runners and impellers and having a structurally complicated structure because a flaw inside the machine causes a serious accident. ing.

FIG. 3 shows a schematic structure of a hydraulic machine, in particular, a Francis type runner. As shown in the drawing, a circular wing is sandwiched between a curved crown 10 and a band 20, and a circular wing. A plurality of blades 30 arranged in rows are configured. This type of runner is often manufactured by the casting method, and even if it is a material with poor workability or poor weldability by the casting method, it can be easily molded, but casting defects, especially cast cavities and segregation, etc. It has the problem that it cannot be avoided. For this reason, even during the manufacturing process of hydraulic machinery, ultrasonic flaw detection is used to check quality assurance in advance and prevent major accidents.

[0005]

[Problems to be solved by the device]

 By the way, in the hydraulic machine, in the above-mentioned configuration, stress is generated at the corners of the joint between the crown 10 and the blade 30 and the corners of the joint between the band 20 and the blade 30 due to the hydraulic pulsation due to the hydraulic pulsation. It is easy, and if left unattended, it will cause a serious accident.

However, since such a portion has a curved surface shape in consideration of stress relaxation, ultrasonic flaw detection, which is conventionally used exclusively for defect inspection of a relatively flat portion of a subject, is used. Inevitably, a gap is created between the subject and the probe, and it is impossible to give a level of confidence in flaw detection accuracy by looking at the pseudo echo caused by the diffusion and refraction of the ultrasonic wave reception caused by this gap. There was a problem.

Therefore, since the joint corner between the crown 10 and the blades 30 and the joint corner between the band 20 and the blades 30 are important parts for ensuring the strength of the hydraulic machine, the advent of technology with high flaw detection accuracy is desired. It is rare.

The present invention has been made in view of such a point, and even in the case of detecting a damage / defect of a test object having a curved shape, the detection accuracy is higher than that of the conventional method, and the flaw detection is performed by a simple operation. The purpose is to announce a newly improved ultrasonic flaw detection probe.

[0009]

[Means for Solving the Problems]

 This invention is a probe for detecting damages and defects of a subject having a curved surface shape, and a plastic member is attached to and detached from the probe portion of the probe so as to closely contact the curved surface portion of the subject. The feature is that it can be installed freely.

[0010]

[Action]

 According to the above configuration, since the plastic member is molded so as to match the curved surface-shaped portion of the subject, when the probe is brought into contact with the subject, it becomes dense with no gap. Therefore, unlike the prior art, the occurrence of pseudo echo due to the gap between the probe and the subject is eliminated, and the flaw detection accuracy is further improved.

[0011]

【Example】

 An embodiment of the ultrasonic flaw detection probe according to the present invention will be described below. FIG. 1 is a conceptual diagram of an ultrasonic flaw detection probe according to the present invention.

Reference numeral 1 denotes a probe, and a probe portion 2 having a convex surface shape is detachably attached to the probe 1 so as to come into close contact with a subject. That is, the probe 2 is made of a plastic member that can be easily molded, and several types are prepared in advance to match the shape of the inspection surface of the subject, and the shape can be seen in FIG. As described above, the probe portion 3 having a concave shape is also prepared.

When the shape of the inspection surface of the subject is changed, the probe 1 is attached to the probe 2 or 3 by the contact agent applied to the probe 2 or 3. 1 are joined, and therefore easy to put on and take off. However, if the probe 1 and the probe part 2 or 3 are joined by an adhesive agent and if a pseudo echo is produced on the probe 1 under the influence of the contact agent, they are joined with a fastening member such as a bolt or a screw. Preferably.

As described above, among the probe parts 2 or 3 prepared in advance, one that matches the inspection surface shape of the subject is selected, and the selected probe parts 2 or 3 are bonded with an adhesive or the like. If the probe 1 is joined to the probe 1, the attachment / replacement work is easy, and the probe 2 or 3 also comes into close contact with the subject. Therefore, the inspection accuracy is higher than ever.

[0015]

[Effect of the device]

 As described above, in the ultrasonic flaw detection probe according to the present invention, the probe portion is molded into a shape that matches the inspection surface shape of the subject, and the attachment and conversion work of the probe portion is facilitated. Therefore, it can be applied to a subject that is difficult to be inspected as in the past, and there is an effect that improvement in inspection technology can be expected.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an example of an ultrasonic flaw detection probe according to the present invention.

FIG. 2 is a conceptual diagram showing another embodiment of the present invention.

FIG. 3 is a partial schematic view showing a part of a hydraulic machine when the ultrasonic flaw detection probe is applied to the hydraulic machine.

[Explanation of symbols]

 1 ... Probe 2, 3 ... Probe 10 ... Crown 20 ... Band 30 ... Wing

Claims (2)

[Scope of utility model registration request] 1. A probe for detecting damages and defects of a subject having a curved surface shape, wherein a plastic member is attached to the probe portion of the probe so as to closely contact the curved surface portion of the subject. An ultrasonic flaw detection probe that is detachably attached. 2. The ultrasonic flaw detection probe according to claim 1, wherein the plastic member is made of plastic.