JPH0640004B2 - Ultrasonic measuring device probe holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention applies ultrasonic waves from the outer surface of equipment pipes, etc. The present invention relates to a probe holder of a measuring device.

<Prior art> This type of probe holder has a thickness of the object to be measured, a scratch or a nest, which is caused by interposing glycerin or a couplant having acoustic characteristics similar to glycerin between the object and the probe. Was being measured.

For example, the equipment pipe is made of metal, and the wall thickness of the pipe changes due to oxidative corrosion of the inner peripheral surface.

It is a deformation of the inner wall surface of the pipe, such as partial peeling or bulging.

When measuring the thickness of the pipe by monitoring it using ultrasonic waves, in order to prevent wear of the probe and to prevent air from intervening between the probe and the pipe, A coupling agent (contact medium) is supplied between them.

<Problems to be Solved by the Invention> When the probe holder is self-propelled along the outer peripheral surface of the pipe while supplying the coupling agent, a missing measurement due to poor propagation of ultrasonic waves due to the coupling agent flowing down or drying. The part came out. Alternatively, the probe supporting part of the measuring device may be displaced due to mechanical or natural disturbance,
Even in this case, it was a cause of the missing portion.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a probe holder that can always hold the probe at a fixed position with respect to a measured object so that good measurement data can be obtained. To provide.

<< Means for Solving the Problem >> In order to achieve the above object, the probe holder of the ultrasonic measuring device according to the present invention is slidably moved along the surface of the object to be measured, and the object to be measured is measured from the probe. In the probe holder of the ultrasonic measurement device, in which the ultrasonic wave is incident on the body, and the thickness and the corroded state of the measured object are known by the time delay until the reflected wave of the incident wave is received, A fitted lower holder is provided, and an upper holder that accommodates the lower holder so as to be movable up and down is provided, and magnets of the same polarity are arranged vertically opposite each other between these holders.

<Operation> Since magnets of the same polarity are placed opposite to each other in the upper holder and the lower holder, the magnets repel each other and the repulsive force causes the lower holder to constantly receive a force that pushes downward.

Therefore, even if the upper holder connected and supported to the measuring apparatus main body moves slightly in the vertical direction, the lower holder side to which the probe main body is fitted can always maintain a uniform contact state with the measured object side. .

<Example> Hereinafter, a preferred example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a cross section of the probe holder 1. The probe holder 1 has a cylindrical lower holder 3 placed at the center position of a nylon shoe 2 having a circularly erected peripheral wall, and a cylindrical lid. The upper holder 4 thus formed is placed on the lower holder 3.

Then, the ring-shaped permanent magnet 5 is horizontally fixed in the upper holder 4, and the ring-shaped permanent magnet 6 attached to the lower holder 3 is located at a lower position facing the permanent magnet 5.
Is provided. The magnet 5 and the magnet 6 repel each other as magnets having the same polarity.

The probe 7 is vertically movably fitted in the lower holder 3, and a vertical cutout 8 is formed in the lower holder 3 so that the probe 7 can move up and down. A sensor work clearance adjusting screw 10 is provided which vertically penetrates the lower holder 3 from above and is screwed into the upper end of a holder 9 for holding the probe 7 main body in the notch 8 in the lower holder 3. A repulsion spring 11 is mounted between the top surface of the notch 8 and the upper end of the holder 9 inside the holder 8 to constantly urge the holder 9 downward. As a result, the holder 9 can be finely adjusted in the vertical direction in the notch 8 by turning the adjusting screw 10 clockwise or counterclockwise, and the coupling between the surface of the object to be measured and the sensor can be achieved. It also becomes possible to adjust the amount of the agent. Furthermore, due to the presence of the permanent magnets 5 and 6, the lower holder 3 is always urged downward. A hole facing the probe 7 is formed in the center of the nylon shoe 2, and a recess 12 is formed around the hole so as to be recessed. Further, from the side surface of the recess 12 A bottleneck 13 is provided on the outer peripheral surface of the nylon shoe 2, and a coupling agent supply port 14 is connected to the bottleneck 13.

Therefore, the coupling agent is supplied from the coupling agent supply port 14 through the bottleneck 13 to the concave portion 12, and the probe 7
The space between the measurement surface side and the object to be measured is properly filled with the coupling agent.

The sensor cable 15 connected to the probe 7 is connected to the probe 7 through the cutout 16 which is switched to the side surface of the upper holder 4 and the U-shaped groove 17 which is formed by laterally cutting the side surface of the nylon shoe 2. is doing.

<Effect> As described in detail above, the probe holder of the present invention is provided with a lower holder fitted with the probe main body, and further provided with an upper holder for accommodating the lower holder in a vertically movable manner,
Since magnets of the same polarity are placed facing each other in the vertical direction between these two holders, when the upper holder is moved along the surface of the object to be measured, it is not expected that mechanical elements supporting the upper holder will be affected. It is possible for the lower holder side to agilely follow changes in the temperature and the rapid level change on the side of the measured object. Therefore, there is an effect that a highly reliable measurement is possible.

Further, since the magnet is used, the mechanism for maintaining a uniform contact level of the probe is simplified, the number of parts that may be corroded by the coupling agent is reduced, and it is also advantageous in terms of maintenance.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a probe holder according to an embodiment of the present invention. 1 ... Probe holder, 2 ... Nylon shoe 3 ... Lower holder, 4 ... Upper holder 5 ... Magnet, 6 ... Magnet 7 ... Probe, 8 ... Notch 9 ... Holder, 10 …… Adjusting screw 11 …… Spring, 12 …… Recessed portion 13 …… Bottle, 14 …… Supply port 15 …… Cable, 16 …… Notch 17 …… U-shaped groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Mitsuru Shimizu Inc. 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Headquarters (72) Inventor Isao Sakato 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Address Stock company Obayashi Corporation Tokyo head office (72) Inventor Norimitsu Mukai 2-3 Kandajimachi, Chiyoda-ku, Tokyo Address company Obayashi Corporation Tokyo head office (72) Inventor Kazuyuki Goto 2 Kandajimachi, Chiyoda-ku, Tokyo No. 3 Stock company Obayashi Corporation Tokyo head office (56) Reference JP-A-59-180317 (JP, A)

Claims (1)

[Claims] 1. A probe is slidably moved along a surface of an object to be measured, an ultrasonic wave is made incident on the object to be measured from the probe, and there is a time delay until reception of a reflected wave of the incident wave. In the probe holder of the ultrasonic measuring device that knows the thickness and corrosion state of the object to be measured, a lower holder in which the probe main body is fitted is provided, and an upper holder for accommodating the lower holder in a vertically movable manner is provided. A probe holder for an ultrasonic measuring device, wherein magnets of the same polarity are provided to oppose each other in the vertical direction between the two holders.