JPH01176941A - Acoustic sensor fitting device - Google Patents

Abstract

PURPOSE:To prevent an acoustic sensor from being displaced and damaged even if the vibration of equipment, etc., operates by storing the acoustic sensor in a storage container fixed to the tip part of an acoustic waveguide rod and pressing and fixing the sensor tightly. CONSTITUTION:While a signal cable 8 is inserted into a cylindrical packing 12, the cable is mounted on a cable lead-out opening 10 and a container lid 14 is screwed in the storage container 9; and then the packing 12 is pressed by the container lid 14 across a bush 13 to fix the cable 8 and the container 9, cable 8, packing 12, and bush 13 are held mutually airtight. A pressure plate 16 mounted on the internal surface of the container lid 14 fixes the acoustic sensor 1 tightly to the bottom part of the container 9 with the pressing force of an elastic body 15. Consequently, the sensor 1 is securely fixed and the sensor 1 is prevented from being damaged by falling owing to the vibration of the equipment, an external shock, etc.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to an acoustic sensor mounting device for mounting an acoustic sensor for detecting an acoustic signal on a sound waveguide, and particularly relates to an acoustic sensor mounting device for mounting an acoustic sensor for detecting an acoustic signal on a sound waveguide. This invention relates to an acoustic sensor mounting device that ensures the safety of acoustic sensors and prevents accidents.

(Prior Art) Acoustic detection devices have conventionally been employed to confirm the presence or absence of defects such as cracks that occur in the main bodies of separate vessels installed in chemical plants, power generation plants, and the like.

This acoustic detection device mounts an acoustic sensor on the surface of the main body of a device, and detects the presence or absence of a defect based on an acoustic signal detected from the acoustic sensor.

However, since this acoustic sensor uses a piezoelectric element with low heat resistance, it cannot generally be used in high-temperature environments of 200°C or higher, and high-temperature acoustic sensors that are used in the temperature range of 60°C to 200°C Although sensors have also been put into practical use,
Detection efficiency is extremely low (applicable equipment is limited to a narrow range).

Therefore, when detecting an acoustic signal when the surface temperature of the object to be measured is high, a sound 91 sensor has conventionally been attached to the object to be measured via an acoustic waveguide rod.

That is, by ensuring a sufficient distance from the object to be measured to the acoustic sensor using the acoustic waveguide rod, the acoustic sensor is isolated so that the ambient temperature at the acoustic sensor falls within the permissible operating temperature range.

As a conventional fixing structure of an acoustic sensor, for example, Japanese Patent Application Laid-open No. 55
FIG. 6 shows the structure disclosed in Publication No.-50157.

In FIG. 6, an acoustic sensor 1 is fixed by an adhesive 4 to the top of an acoustic waveguide rod 3 which is protruded from the surface of an object 2 to be measured.

Further, as another fixing structure, a fixing structure disclosed in Japanese Utility Model Application Laid-Open No. 56-155346 is shown in FIG. The acoustic sensor 1 shown in FIG. 7 is used to measure sound generated from defects such as cracks in a process pipe as an object 2 to be measured.

The acoustic waveguide 3 is connected to the object to be measured 2 via the waveguide installation jig 5.
is mounted on the surface of the Further, a couplant 6 and a sensor mounting jig 7 are provided at the top of the acoustic waveguide rod 3, and the acoustic sensor 1 is sandwiched and fixed between the couplant 6 and the sensor mounting jig 7.

Sound generated from the object to be measured 2 is transmitted to the acoustic sensor 1 by the acoustic waveguide 3 . The acoustic sensor 1 transmits the detected acoustic signal to a detection display unit (not shown) via a signal cable 8.

(Problems to be Solved by the Invention) However, the acoustic sensor with the conventional fixed structure was only fixed to the tip of the sound W waveguide rod with adhesive or a simple sensor mounting jig, so the acoustic sensor The disadvantage was that the protection was insufficient.

That is, since the acoustic sensor is fixed and exposed to the outside, it is difficult to use it outdoors where it is exposed to rain and wind.

In addition, as a protective measure when used outdoors, a method was adopted to cover the entire acoustic sensor including the acoustic waveguide, but the cooling effect did not progress sufficiently and the operating temperature rose over time. However, there was a drawback that accurate measurement was difficult.

On the other hand, waterproof type sensors generally have a problem in that they are complicated in structure and operation and are expensive.

Furthermore, in a structure in which the acoustic sensor is fixed with adhesive as in the conventional example shown in FIG. 6, there is concern about the bonding strength. In other words, vibration of the object to be measured, swinging of the signal cable, expansion and contraction of the sound W waveguide due to thermal cycles, inspection personnel or repair tools accidentally pulling the signal cable, or contact with other equipment during work. There is a risk that the acoustic sensor may fall off from the acoustic waveguide and be damaged due to the impact.

Furthermore, in a structure in which the acoustic sensor is sandwiched between sensor mounting jigs as shown in Fig. 7, the bonding strength between the acoustic sensor and the acoustic waveguide rod is greatly increased, and it is possible to reliably prevent the acoustic sensor from falling off due to external force. However, it is difficult to install outdoors because it is not waterproof. Further, there is a problem in that the signal cable is broken at the signal cable outlet of the acoustic sensor due to deflection of the signal cable due to vibration of the object to be measured or external force acting on the signal cable.

The present invention has been made to solve the above problems, and has a simple structure that securely fixes the acoustic sensor to prevent damage and prevents rainwater from entering. An object of the present invention is to provide an acoustic sensor mounting device that can be installed in a.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, an acoustic sensor mounting device according to the present invention includes a storage container fixed to the tip of a sound waveguide rod and housing an acoustic sensor; A cable outlet drilled in the side wall of the storage container to lead the signal cable of the acoustic sensor to the outside of the storage container, a sealing member that airtightly seals the cable outlet through which the signal cable is inserted, and a sealing member that can be attached to and removed from the storage container. It is characterized by comprising a container lid that is freely attached and closely connects the storage container, and an elastic body that is fixed to the inner surface of the container lid and presses and fixes the acoustic sensor to the bottom of the storage container.

(Function) According to the acoustic sensor mounting device having the above configuration, the acoustic sensor is housed in the storage container fixed to the tip of the acoustic waveguide rod, and the acoustic sensor is attached to the storage container by the elastic body fixed to the inner surface of the container lid. It is firmly pressed and fixed to the bottom. Therefore, it becomes possible to securely fix the acoustic sensor, and it is possible to prevent the acoustic sensor from falling off and being damaged due to vibration of the device or external force.

Furthermore, the storage container is sealed by the container lid, and the cable outlet through which the signal cable led out from the acoustic sensor is inserted is hermetically sealed, so that rainwater is prevented from entering the storage container. Therefore, it becomes possible to install the acoustic sensor outdoors.

(Example) Next, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 and FIG. 2 are a perspective view and a sectional view, respectively, showing an embodiment of an acoustic sensor mounting device according to the present invention.

That is, the acoustic sensor mounting device according to this embodiment has a storage container 9 fixed to the tip of the acoustic waveguide rod 3, and the storage container 9 stores the acoustic sensor 1.

A cable outlet 10 is provided in the side wall of the storage container 9 to lead out the signal cable 8 of the acoustic sensor 1 to the outside. The cable outlet 10 has a U-shaped cross section as shown in FIG. 3, and is provided with a sealing member 11 for sealing the section after the signal cable 8 is inserted therethrough. The sealing member 11 is formed of, for example, a cylindrical packing 12 through which the signal cable 8 is inserted and held at the cable outlet 10, and an elastic material such as hard rubber, and the cylindrical packing 12 is inserted into the lower end of the cable outlet 10. It is composed of a bush 13 to be pressed.

On the other hand, a container lid 14 is provided which is detachably attached to the storage container 9 by screwing. On the inner surface of the container lid 14,
A holding plate 16 is attached with an elastic body 15 such as a coil spring interposed therebetween. Further, a ring gasket 17 is attached to the inner circumferential surface of the container lid 14 for abutting against the upper edge of the storage container 9 to maintain mutual airtightness.

In the acoustic sensor mounting device configured as described above, the signal cable 8 is inserted into the cylindrical packing 12 and attached to the cable outlet 10, the bushing 13 is attached to the upper part of the signal cable 8, and then the container lid 14 is attached to the storage container 9. When screwed in, the cylindrical packing 12 is crushed by the container "1i14" through the bushing 13, whereby the signal cable 8 is fixed, and the storage container 9, the signal cable 8, and the cylindrical packing 12 are
The bushes 13 are kept airtight from each other.

On the other hand, the presser plate 16 attached to the inner surface of the container lid 14
The acoustic sensor 1 is firmly fixed to the bottom of the storage container 9 by the pressing force of 5.

Therefore, according to this embodiment, since the acoustic sensor 1 can be securely fixed, the acoustic sensor 1 is prevented from falling off and being damaged due to equipment vibration, thermal stress, or external impact. In particular, the signal cable 8 is
0, the acoustic sensor 1 is firmly fixed by the container lid 14 via the cylindrical packing 12 and bushing 13, so the acoustic sensor 1 may be damaged by tensile force or vibration acting on the signal cable 8, and the signal cable 8 may be disconnected. is effectively prevented.

In addition, a storage container 9, a container lid 14, a cable outlet-10
Since they are mutually sealed to ensure airtightness, there is no intrusion of rainwater, and the acoustic sensor 1 can be installed outdoors.

Next, another embodiment of the present invention will be described with reference to FIGS. 4 and 5.

The acoustic sensor mounting device according to this embodiment fixes a rectangular storage container 9 for housing the acoustic sensor 1 to the upper end of the acoustic waveguide rod 3, and detachably attaches the rectangular container 9 to the upper edge of the storage container 9.
4 are arranged. The container 114 and the storage container 9 are 4
It has a 1M structure which is joined into one piece by m mounting bolts and nuts 18. Further, a cable outlet 10 for leading out the signal cable 8 is bored in the side wall of the storage container 9. This cable outlet 10 has a signal cable 8
A cable clamp 19 is provided to fixedly support the. The cable clamp 19 includes a pair of fixing fittings 2 that clamp the cylindrical packing 12 through which the signal cable 8 is inserted from above and below.
0a, 20b, and a pair of fixing bolts and nuts 21 for fastening the fixing fittings 20a, 20b to each other at both ends. The fixture 20a is integrally fixed to the side wall of the storage container 9.

According to this embodiment, the container lid 14 is attached to the mounting bolt nut 18.
The acoustic sensor 1 is firmly attached to the upper edge of the storage container 9, and the acoustic sensor 1 is more firmly fixed in a predetermined position by the pressing force of the presser plate 16 with an elastic body 15 interposed therebetween. Damage to the acoustic sensor 1 due to falling etc. can be prevented.

Further, a cable clamp 19 is provided on the side wall of the storage container 9 for fixing the end portion of the signal cable 8 from the acoustic sensor 1, and the signal cable 8 is fixed to the fixing bolt nut 2.
Since the signal cable 8 is firmly tightened and fixedly supported by the acoustic sensor 1, even if vibration or tensile stress is applied to the signal cable 8, the signal cable 8 is prevented from falling off from the acoustic sensor 1, or the signal cable 8 itself is prevented from being damaged. I can do something.

Furthermore, when the container lid 14 is tightened, the cable outlet 1o is pressed and sealed via the bushing 13 and the cylindrical packing 12, and the storage container 9 is made airtight by the ring packing 17 attached to the inner peripheral surface of the container M14. Retain your sexuality. As a result, the intrusion of rainwater and the like is avoided, making it possible to arrange the acoustic sensor 1 outdoors.

〔Effect of the invention〕

As explained above, according to the acoustic sensor mounting device of the present invention, the acoustic sensor is housed in the container fixed to the tip of the acoustic waveguide, and the acoustic sensor is mounted by the elastic body fixed to the inner surface of the container lid. It is firmly suppressed and fixed. Therefore, even if vibrations of the equipment or external force are applied, the acoustic sensor is effectively prevented from being displaced or falling off and being damaged.

Further, since the storage container is sealed by the container lid and the cable outlet is also held airtight by the sealing member, rainwater is prevented from entering the storage container.

Therefore, the acoustic sensor can be placed outdoors, and the acoustic sensor can be sufficiently protected, and the maintenance and management of the acoustic detection device can be made extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the acoustic sensor mounting device according to the present invention, FIG. 2 is a vertical sectional view of FIG. 1, and FIG.
4 is a perspective view showing another embodiment, FIG. 5 is a vertical sectional view of FIG. 4, and FIG. 6 is a front view showing a structural example of a conventional acoustic sensor mounting device. 7 are sectional views showing other conventional examples. DESCRIPTION OF SYMBOLS 1... Acoustic sensor, 2... Measured object, 3... Acoustic waveguide rod, 4... Adhesive, 5... Waveguide rod mounting jig, 6
... Couplant, 7... Sensor mounting jig, 8...
Signal cable, 9... Storage container, 1o... Cable outlet, 11... Sealing member, 12... Cylindrical packing, 13... Bushing, 14... Container lid, 15...・
Elastic body, 16... Holding plate, 17... Ring packing, 18... Mounting bolt nut, 19... Cable clamp, 20a, 20b... Fixing metal fittings, 21...
Fixing bolts and nuts. Representative Patent Attorneys Nori Chika Ken Ken Suiko Maru Figure 1 Figure 2 Figure 3 Figure 5 Figure 7

Claims (1)

[Scope of Claims] 1. A storage container fixed to the tip of the acoustic waveguide rod and housing the acoustic sensor, and a housing provided in the side wall of the storage container for guiding the signal cable of the acoustic sensor to the outside of the storage container. a sealing member that airtightly seals the cable outlet through which the signal cable is inserted and the cable outlet through which the signal cable is inserted; a container lid that is detachably attached to the storage container and seals the storage container; and a sealing member that is fixed to the inner surface of the container lid. An acoustic sensor mounting device comprising: an elastic body that presses and fixes the acoustic sensor to the bottom of the storage container. 2. The acoustic sensor mounting device according to claim 1, wherein the container lid is screwed onto a screw formed on the storage container and is detachably attached. 3. The acoustic sensor mounting device according to claim 1, wherein the container lid is detachably attached to the storage container with a mounting bolt. 4. The acoustic sensor mounting device according to claim 1, wherein the cable outlet includes a cable clamp for fixedly supporting the signal cable.