JPH0545973Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention relates to a tire-shaped ultrasonic probe.

[Prior art and its problems]

BACKGROUND ART Conventionally, for example, a tire-shaped ultrasonic probe is used to detect the thickness of a continuously moving steel plate or the like. As shown in FIG. 4, this probe consists of a fixed shaft 1, an ultrasonic transducer 2 attached to the fixed shaft 1, and a bearing 3 attached to the fixed shaft 1 so as to surround the ultrasonic transducer 2. Tire 4 rotatably mounted
It is made up of. A transmission medium 5 such as silicone oil is filled between the tire 4 and the ultrasonic vibrator 2.

In the conventional tire-type ultrasonic probe configured in this way, the steel plate 6 moves continuously.
A probe is installed so that the tire 4 is in contact with the top surface via the couplant 7, and ultrasonic waves are emitted from the ultrasonic transducer 2 toward the steel plate 6, and the reflected waves cause the steel plate 6 to Measure the thickness of the plate.

However, the conventional tire-shaped ultrasonic probe described above has the following problems. That is, the ultrasonic waves emitted from the ultrasonic vibrator 2 are attenuated by the transmission medium 5 and the tire 4, resulting in a decrease in the accuracy of measuring the plate thickness. Moreover, since the tire 4 is easily deformed, the incident angle of the ultrasonic wave changes during the measurement of the thickness, resulting in a decrease in the accuracy of the measurement of the thickness.

The above-mentioned problem also occurs when a tire-shaped ultrasonic probe is used to detect flaws in a steel plate by injecting ultrasonic waves into the steel plate from an oblique direction, that is, when performing oblique angle flaw detection.

[Purpose of invention]

The purpose of this invention is that the attenuation of the ultrasonic waves emitted from the ultrasonic vibrator is small, and the tire is less likely to deform.As a result, tire-shaped ultrasonic waves can be used to measure plate thickness and detect flaws with high precision. The purpose is to provide a probe.

[Summary of the idea]

This invention includes a fixed shaft, a tire rotatably attached to the fixed shaft with a space therebetween,
A tire-type ultrasonic probe comprising an ultrasonic transducer fixed to the fixed shaft toward the inner surface of the tire, and a space between the tire and the ultrasonic transducer is filled with an ultrasonic transmission medium. in which the tire is made of butadiene rubber;
A reinforcing material is applied to the inner surface of the tire, the ultrasonic probe is embedded in a holding material made of butadiene rubber, and the reinforcing material is arranged parallel to the axial direction of the tire and in the direction of the tire. It is characterized by being made up of a plurality of bars arranged at intervals along the inner circumferential surface and whose ends are connected to each other.

[Structure of the idea]

Next, one embodiment of the tire-shaped ultrasonic probe of this invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the tire-type ultrasonic probe of this invention.

In FIG. 1, a fixed shaft 8 is fixed to the tip of an arm 9. As shown in FIG. Seal packing 1 is attached to the fixed shaft 8.
A tire 11 is rotatably attached to the fixed shaft 8 with a space therebetween. Since the tire 11 is made of butadiene rubber, the attenuation of ultrasonic waves emitted from an ultrasonic vibrator, which will be described later, is extremely small.

The inner surface of the tire 11 is reinforced with a reinforcing material 12. As shown in FIG. 2, the reinforcing material 12 is
It consists of a pair of ring plates 13 and a plurality of bars 14 fixed between the ring plates 13.
is in close contact with the inner surface of the tire 11. This prevents the tire 11 from deforming.

The ultrasonic vibrator 15 is embedded in a holding member 16 fixed to the fixed shaft 8 so as to protrude therefrom at right angles toward the inner surface of the tire 11. The holding material 16 is also made of butadiene rubber like the tire 11. The space between the holding member 16 and the tire 11 is filled with an ultrasonic transmission medium such as silicone oil.

According to the above-described tire-type ultrasonic probe of this invention, the ultrasonic waves emitted from the ultrasonic transducer 15 pass through the holding material 16, the transmission medium, and the tire 11 rolling on the steel plate 17, and reach the steel plate. spread throughout the 17th,
The reflected wave is received by the ultrasonic transducer 15, and the thickness of the steel plate 17 is thereby measured.

Since the holding material 16 protrudes to the vicinity of the inner surface of the tire 11, the amount of transmission medium filled between the tire 11 and the holding material 16 is small;
Tire 11 is made of butadiene rubber that has extremely low attenuation of ultrasonic waves;
Because the reinforcing material 12 makes it difficult to deform, continuous plate thickness measurement using ultrasonic waves can be performed with high precision. Further, since the attenuation of the ultrasonic waves is small in this way, there is no need to apply couplant between the tire 11 and the steel plate 17 as in the conventional case.

Note that, as shown in FIG. 3, this invention can also be applied to the case where the ultrasonic vibrator 15 is buried obliquely in the holding material 16 and flaws in the steel plate 17 are detected at an oblique angle.

[Effect of idea]

As explained above, according to this invention, the attenuation of ultrasonic waves is small and the tire is not easily deformed, so it is extremely useful for measuring the thickness of steel plates and detecting flaws with high precision. effect is brought about.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the tire-shaped ultrasonic probe of this invention, FIG. 2 is a perspective view of a reinforcing material in the same embodiment, and FIG. FIG. 4, a cross-sectional view showing another embodiment of the sonic probe, is a cross-sectional view of a conventional tire-type ultrasonic probe. In the drawings, 1... fixed shaft, 2... ultrasonic vibrator, 3... bearing, 4... tire, 5... transmission medium, 6... steel plate, 7... couplant, 8... fixed shaft, 9...Arm, 10...Seal packing, 11...Tire,
12... Reinforcement material, 13... Ring plate, 14... Bar, 15... Ultrasonic vibrator, 16... Holding material, 1
7...Steel plate.

Claims (1)

[Claims for Utility Model Registration] A fixed shaft, a tire rotatably attached to the fixed shaft with a space therebetween, and an ultrasonic vibrator fixed to the fixed shaft toward the inner surface of the tire. In a tire-type ultrasonic probe, the gap between the tire and the ultrasonic transducer is filled with an ultrasonic transmission medium, the tire being made of butadiene rubber;
A reinforcing material is applied to the inner surface of the tire, the ultrasonic probe is embedded in a holding material made of butadiene rubber, the holding material protrudes from the fixed shaft toward the inner surface of the tire, and, The reinforcing material is
A tire-type ultrasonic detector comprising a plurality of bars arranged parallel to the axial direction of the tire and at intervals along the inner circumferential surface of the tire, the ends of which are connected to each other. Tentacles.