JPH0447630Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a vibration meter used to detect vibrations accompanying the operation of a valve such as a steam trap or vibrations of a rotating shaft to check whether the operation is good or not.

Conventional technology Conventionally, as a vibration meter, for example,
There is one shown in Publication No. 187739. This is done by detecting the vibrations that occur when steam leaks.
This is used to determine the presence or absence of steam leaks, and a detection needle that touches the object to be detected is attached to the probe casing.
An ultrasonic microphone using a piezoelectric element converts the vibration of the detection needle into an electrical signal, and the electrical signal is amplified to make the meter needle swing or make a speaker sound.

Problems to be Solved by the Present Invention The above device detects the vibration from the detection needle and causes the meter needle to shake or the speaker to sound, so it is possible to detect the vibration level. However, this method has a problem in that the vibration level cannot be measured accurately and quickly. That is, this is because the detection needle slides on the object to be detected during measurement.

The technical problem of the present invention is to enable accurate and rapid measurement of vibration levels.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems consists of a rod-shaped detection needle that detects vibration by contacting the object to be detected at one end, and It consists of a hollow cylindrical detection needle holding member that covers all but one end, and the rod-shaped detection needle is pushed in a predetermined amount to press one end of the detection needle together with the tip of the detection needle holding member against the surface of the object to be detected. In a device for detecting vibrations of an object, an elastic member such as rubber or synthetic resin is attached to the surface pressing portion of the object to be detected at the tip of the detection needle holding member.

Action When the tip of the detector is applied to an object to be detected, such as a steam trap valve casing or a rotating shaft bearing,
The vibration of the object to be detected is transmitted to the detection needle. At the same time, the tip of the detection needle holding member also hits the object to be detected. The tip of the detection needle holding member is made of an elastic material such as rubber or synthetic resin, so it comes into close contact with minute irregularities on the surface of the object to be detected, and the coefficient of friction is large, which prevents the detection needle holding member and, by extension, the detection The needle does not slide over the object to be detected.

Therefore, a fixed measurement point can be measured, and the vibration caused by the movement of the detection needle is not detected mixed with the vibration of the object to be detected, so that an accurate vibration level can be measured. In addition, when a certain amount of time is required for measurement, it is possible to prevent the measurement from being repeated halfway due to the measurement point slipping and moving, thereby allowing rapid measurement.

Effect of invention The present invention produces the following specific effects.

The detection needle does not slide on the object to be detected, and only the vibration level of the object can be measured, making it possible to accurately judge whether the object is good or bad.

Moreover, there is no need to redo measurements, and rapid measurements are possible.

Furthermore, the vibrations transmitted to the detection needle holding member are absorbed by the elastic member and do not affect the vibration level to be detected.

EXAMPLE An example showing a specific example of the present invention will be described. (See Figure 1) The overall configuration of the vibration meter is a detector 1, a calculation device 50,
It also consists of a cable 51 that connects the two. The detector 1 includes a detection needle 2, a detection needle holding member 4 whose tip is formed of an elastic member 3 made of rubber or synthetic resin, a front cover 6 that connects the detection needle holding member 4 and the main body 5, and a cable outlet. It is formed from a rear cap 7 having a diameter of 25. Front cover 6 and main body 5
A holding plate 15 that holds the diaphragm mounting member 11 and a microphone holder 18 that holds the holding plate 15 and the ultrasonic microphone 16 via an O-ring 17 are coupled to the approximately cylindrical internal space formed by the A spring holder 19 and a printed circuit board 20 having a circuit for amplifying the detection signal are arranged.

The detection needle holding member 4 has a conical upper half and a cylindrical lower half. A penetrating vertical hole 9 is made in the center, and the detection needle 2 is placed inside. The detection needle 2 slides within the detection needle holding member 4 until the tip of the detection needle holding member 4 comes into contact with the surface of the object to be detected. The detection needle 2 has a substantially cylindrical shape, and has a temperature sensor 1 at one end.
0, and the other end is press-fitted into the diaphragm mounting member 11. Lead wire 26 from temperature sensor 10
is a conductor hole 12 provided halfway in the center of the detection needle 2.
, the vertical hole 9 of the detection needle holding member 4, the holding plate 15,
The printed circuit board 20 is inserted through the communication hole 14 that communicates the spring holder 19 and the microphone holder 18.
Connect inside. The diaphragm 21 is screwed onto one end of the diaphragm mounting member 11. An ultrasonic microphone 16 is placed facing the diaphragm 21. The pins of the ultrasonic microphone 16 are connected into the printed circuit board 20. The spring holder 19 has a cylindrical space inside, and a coil spring 22 is disposed therein to maintain a constant pressing force of the detection needle 2 against the object to be detected. The holding plate 15, spring holder 19, and microphone holder 18 are coupled with screws 23.

The calculation device 50 is a printed circuit board 20 inside the detector 1.
A functional unit that performs arithmetic processing on each signal sent from
It consists of a display section, etc.

The entire device operates as follows. When the temperature sensor 10 at the tip of the detector 1 is applied to the object to be detected,
The temperature signal is sent directly to the computing device 50 through the conductor 26,
At the same time, mechanical vibrations are transmitted to the diaphragm mounting member 11 through the detection needle 2, causing the diaphragm 21 to vibrate.
The vibration of the diaphragm 21 propagates through the space inside the microphone holder 18 and is transmitted to the facing ultrasonic microphone 16.
The vibration signal is sent to the arithmetic unit 50 through the printed circuit board 20.

Arithmetic device 50 converts the signal from temperature sensor 10 into a saturation pressure for the measured temperature. It also stores the relationship between vibration level and leakage amount depending on the pressure of the steam system. The amount of steam leakage is calculated and displayed from this pressure and vibration level.

The tip of the detection needle holding member 4 is made of an elastic member 3 such as rubber or synthetic resin, so when it is pressed together with the detection needle 2 against the object to be detected, its coefficient of friction is large and it will not slip and move. do not have. The detection needle 2 held by the detection needle holding member 4 also does not slip and move, making it possible to accurately measure the vibration level of the object to be detected.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the present invention and a sectional view of the detector. 1...Detector, 2...Detection needle, 3...Elastic member, 4...Detection needle holding member, 10...Temperature sensor, 16...Ultrasonic microphone, 18...Microphone holder, 20...Printed circuit board , 21... diaphragm,
22... Coil spring, 50... Arithmetic device,
51...Cable.

Claims (1)

[Scope of utility model registration request] It consists of a rod-shaped detection needle that contacts the object to be detected at one end to detect vibrations, and a hollow cylindrical detection needle holding member that covers all but one end of the detection needle.The rod-shaped detection needle is pushed in a predetermined amount for detection. In devices that detect the vibration of an object by pressing one end of the detection needle against the surface of the object to be detected together with the tip of the needle holding member, the tip of the detection needle holding member that presses the surface of the object to be detected is made of rubber, synthetic resin, etc. A vibration meter characterized by having an elastic member attached.