JPH1183616A - Necessary vibration component extracting vibration measuring equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure accurate vibration amount without being affected by the vibration amount having frequencies which are not resonant with the number of revolution of a rotary machine. SOLUTION: In this vibration measuring equipment, a vibration detector 2 fixed to a rotary machine 1 outputs an AC signal which is in proportion to the vibration amount of a rotating shaft or a bearing base, which amount is measured by processing the AC signal. A vibration component extracting means 3 is installed, which extracts an AC signal corresponding to the vibration amount having a frequency which is resonant with the number of revolution of the rotary machine which number is previously set with respect to the AC signal outputted from the vibration detector 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration measuring device for measuring the amount of vibration of a rotating shaft or a bearing stand of a rotating machine, and more particularly to a vibration measuring device which is not affected by the amount of vibration of a frequency which is not synchronized with the rotation speed of the rotating machine. The present invention relates to a required-vibration-component-extraction-type vibration measuring device capable of accurately measuring a vibration amount.

[0002]

2. Description of the Related Art Conventionally, a vibration measuring device for measuring a vibration amount of a rotating shaft of a rotary machine or a bearing stand has been widely used. This vibration measuring device appropriately processes an AC signal output from a vibration detector that is attached to a rotating machine and outputs an AC signal proportional to the amount of vibration of the rotating shaft and the bearing stand of the rotating machine, and processes the rotating machine. It measures the amount of vibration of the rotating shaft and bearing stand.

FIG. 7 is a block diagram showing a configuration example of a conventional vibration measuring device of this type. In FIG. 7, a vibration detector 602 attached to a rotating machine 601 outputs an AC signal proportional to the amount of vibration of the rotating shaft of the rotating machine 601 and the bearing stand.

The AC signal output from the vibration detector 602 is converted into a DC signal by a rectification / smoothing circuit 606, and a signal (0 to 4 VDC) corresponding to an arbitrarily set vibration amount measurement range is obtained. An addition circuit 608 that amplifies the signal by an amplification circuit 607 having such an amplification degree and further adds 1 VDC so as to obtain a unified signal of 1 to 5 VDC is a unified signal 1 to 1 that can be used by an externally connected instrument. 5
Convert to VDC and output.

[0005]

By the way, in such a vibration measuring device, it is ideal that the vibration amount of the rotating shaft and the bearing stand of the rotating machine is generated with a frequency synchronized with the rotation speed of the rotating machine. It is a target.

However, the actual amount of vibration is generated with a different frequency depending on the manufacturing condition of the rotating machine and the mounting condition of the vibration detector 602 in addition to the frequency synchronized with the rotation speed of the rotating machine. Sometimes.

However, in the above-described conventional vibration measuring device, since the vibration detector 602 outputs the vibration amount having a different frequency as an AC signal, the vibration converter 602 also converts the vibration signal to a unified signal of 1 to 5 VDC. Although the output is converted and output, the magnitude of the vibration amount at a frequency not synchronized with the rotational speed of the rotating machine often changes.

For this reason, a change in the amount of vibration at a frequency not synchronized with the rotational speed of the rotating machine directly changes the output of the vibration measuring device, and it becomes impossible to accurately measure the amount of vibration.

SUMMARY OF THE INVENTION An object of the present invention is to provide a required vibration component extraction type vibration measuring apparatus capable of accurately measuring a vibration amount without being affected by a vibration amount of a frequency which is not synchronized with the rotation speed of the rotating machine. Is to do.

[0010]

In order to achieve the above-mentioned object, a vibration detector which is attached to a rotating machine and outputs an AC signal proportional to the amount of vibration of a rotating shaft or a bearing stand of the rotating machine is output. In a vibration measuring device for processing an AC signal to measure a vibration amount of a rotating shaft of a rotating machine or a bearing stand, an AC signal output from a vibration detector is set in advance. Vibration component extracting means for extracting an AC signal corresponding to a vibration amount of a frequency synchronized with the rotation speed of the rotating machine.

Therefore, in the vibration measuring apparatus for extracting necessary vibration components according to the first aspect of the present invention, the vibration component extracting means set to pass only the frequency corresponding to the rotation speed of the rotary machine is used to rotate the rotary machine. All frequencies that are different from the frequency tuned to the number are removed, so that signals at frequencies not tuned to the rotational speed of the rotating machine are not affected. Can be converted.

According to the second aspect of the present invention, the frequency tuned to the rotation speed at the time of the first check when the rotating machine is operated, and the rotation speed during the normal operation, for the AC signal output from the vibration detector. There is provided a vibration component extracting means for extracting an AC signal corresponding to two vibration amounts having frequencies tuned to the number.

Therefore, in the vibration measuring apparatus for extracting necessary vibration components according to the second aspect of the present invention, the rotational component of the rotary machine is rotated by the vibration component extracting means set so as to pass only the frequency corresponding to the rotation speed of the rotary machine. All frequencies that are different from the frequency tuned to the number are removed, so that signals at frequencies not tuned to the rotational speed of the rotating machine are not affected. Can be converted.

Further, it is possible to easily cope with the case where there are two vibration amounts of the rotation speed of the rotating machine to be measured.
Further, according to the third aspect of the present invention, a vibration for extracting an AC signal corresponding to a vibration amount of a frequency synchronized with a rotating speed of a rotating machine that is constantly changing with respect to an AC signal output from a vibration detector. Component extraction means is provided.

Therefore, in the vibration measuring device for extracting necessary vibration components according to the third aspect of the present invention, the vibration component extracting means set to pass only the frequency corresponding to the rotation speed of the rotary machine is used to rotate the rotary machine. All frequencies that are different from the frequency tuned to the number are removed, so that signals at frequencies not tuned to the rotational speed of the rotating machine are not affected. Can be converted.

Furthermore, according to the present invention, the frequency of the AC signal output from the vibration detector is adjusted to the frequency tuned to the rotation speed of the rotating machine and the vibration amount of the frequency twice and half the frequency. A vibration component extracting means for extracting a corresponding AC signal is provided.

Therefore, in the vibration measuring apparatus for extracting necessary vibration components according to the fourth aspect of the present invention, the vibration component extracting means set to pass only the frequency corresponding to the rotation speed of the rotary machine is used to rotate the rotary machine. All frequencies that are different from the frequency tuned to the number are removed, so that signals at frequencies not tuned to the rotational speed of the rotating machine are not affected. Can be converted.

The largest value of the vibration amount generated from the rotating machine is the signal tuned to the rotation speed.
Similarly to the signal, a signal that is a major point in measuring the vibration amount is a signal whose frequency is doubled and a signal whose frequency is double.
Since the signal is doubled, the remaining two frequencies are set by the vibration component extracting means, and by superimposing the signals of these three frequencies, it is possible to perform measurement while suppressing the point for measuring the vibration amount.

On the other hand, according to the invention of claim 5, the above-mentioned claim 1 is provided.
In the required vibration component extraction type vibration measuring device according to any one of claims 4 to 5, when the rotation speed of the rotating machine is low, an AC signal corresponding to a vibration amount of a frequency synchronized with the rotation speed of the rotating machine is output. A bypass means for bypassing the vibration component extracting means to be extracted is added.

Therefore, in the vibration measuring device of the required vibration component extraction type according to the fifth aspect of the present invention, in addition to having the same operation as the first to fourth aspects of the present invention, the vibration detector is characterized by its characteristics. When the rotating machine is started (immediately after the start of operation), the number of vibrations is difficult to measure because the number of rotations is low, and the amount of vibration of the rotating machine itself is difficult to generate. By measuring the vibration component, the vibration amount can be measured.

According to the invention of claim 6, in the above-mentioned claim 1,
5. The vibration measuring device according to claim 4, wherein the vibration measuring device outputs an AC signal proportional to the amount of vibration of the rotating shaft of the rotating machine or the bearing pedestal. And a detector switching means for switching between a low-frequency vibration detector and a high-frequency vibration detector according to the rotation speed of the rotating machine. ing.

Therefore, the vibration measuring device of the required vibration component extraction type according to the sixth aspect of the present invention has the same effect as the first to fourth aspects of the present invention, and also measures the vibration amount of the rotary machine. However, by installing the low-frequency vibration detector and the high-frequency vibration detector, by-pass means for bypassing the vibration component extraction means taking into account the frequency characteristics of the vibration detector is not required, and the rotating machine is started. Therefore, the function can be used in the entire rotation speed range. As described above, accurate measurement of the vibration amount can be performed without being affected by the vibration amount at a frequency not synchronized with the rotation speed of the rotating machine.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram showing a configuration example of a required vibration component extraction type vibration measuring device according to the present embodiment.

In FIG. 1, an AC signal output from a vibration detector 2 attached to the rotating machine 1 and proportional to the amount of vibration of the rotating shaft and the bearing stand of the rotating machine 1 is converted to a vibration component extracting unit 3.
To enter.

The vibration component extraction unit 3 is composed of a filter 4 and a filter center setting circuit 5, and an AC signal output from the vibration detector 2 passes through the filter 4. The signal that has passed through the filter 4 is converted into a DC signal by the rectifier / smoothing circuit 6, and the amplifier circuit 7 has an amplification degree such that a signal (0 to 4 VDC) corresponding to an arbitrarily set vibration amount measurement range is obtained. And 1V so that the unified signal becomes 1-5VDC.
An addition circuit 8 for adding DC converts the signal into 1 to 5 VDC, which is a unified signal that can be used by an externally connected instrument, and outputs the signal.

Next, the operation of the vibration measuring device for extracting necessary vibration components of the present embodiment configured as described above will be described. In FIG. 1, an AC signal output from a vibration detector 2 attached to the rotating machine 1 and proportional to the amount of vibration of the rotating shaft and the bearing stand of the rotating machine 1 is input to a vibration component extraction unit 3.

The AC signal input to the vibration component extraction unit 3 is input to the filter 4 of the vibration component extraction unit 3 composed of the filter 4 and the filter center setting circuit 5. The filter 4 employs a band-pass filter, and is a circuit for setting the center of the filter 4 by a filter center setting circuit 5.

The filter center setting circuit 5 is set in advance to a frequency tuned to the rotation speed of the rotary machine 1, whereby the filter 4 removes frequencies other than the frequency tuned to the rotation speed of the rotary machine 1.

That is, the vibration component extraction unit 3 passes only the AC signal corresponding to the vibration amount of the frequency synchronized with the rotation speed of the rotary machine 1. Then, the signal that has passed through the vibration component extraction unit 3 is converted into a DC signal by the rectification / smoothing circuit 6, and the amplification degree is set to a signal (0 to 4 VDC) corresponding to an arbitrary set measurement range of the vibration amount. The signal is amplified by an amplifier circuit 7 having an output signal, and is added to 1 VDC so as to obtain a unified signal of 1 to 5 VDC. Is done.

As described above, in the required vibration component extraction type vibration measuring apparatus of the present embodiment, the filter center setting circuit 5
Since the filter 4 set to pass only the frequency corresponding to the rotation speed of the rotary machine 1 removes all frequencies different from the frequency tuned to the rotation speed of the rotary machine 1,
The signal of the frequency not synchronized with the rotation speed of the rotating machine 1 is not affected, and only the signal of the frequency synchronized with the rotation speed of the rotating machine 1 can be converted.

As a result, accurate measurement of the vibration amount can be performed without being affected by the vibration amount of a frequency not synchronized with the rotation speed of the rotary machine 1. (Second Embodiment) FIG. 2 is a block diagram showing a configuration example of a required vibration component extraction type vibration measuring device according to the present embodiment.

In FIG. 2, a rotating machine 101 output from a vibration detector 102 attached to the rotating machine 101
An AC signal that is proportional to the amount of vibration of the rotating shaft and the bearing stand is input to the vibration component extraction unit 103.

The vibration component extraction unit 103 includes a filter 104
, Two filter center setting circuits 105 and an external operation switch 109, and an AC signal output from the vibration detector 102 passes through the filter 104.

The signal passed through the filter 104 is rectified
The signal is converted into a DC signal by the smoothing circuit 106, amplified by an amplifier circuit 107 having an amplification degree that becomes a signal (0 to 4 VDC) corresponding to a measurement range of an arbitrarily set vibration amount, and converted into a unified signal of 1 to 5 VDC. The addition circuit 108 adds 1 VDC so that the signal is converted into 1 to 5 VDC, which is a unified signal that can be used by an externally connected instrument, and output.

Next, the operation of the vibration measuring device for extracting necessary vibration components of the present embodiment configured as described above will be described. In FIG. 2, an AC signal output from a vibration detector 102 attached to the rotating machine 101 and proportional to the amount of vibration of the rotating shaft and the bearing stand of the rotating machine 101 is input to a vibration component extracting unit 103.

The AC signal input to the vibration component extraction unit 103 is input to the filter 104 of the vibration component extraction unit 103 including the filter 104, the filter center setting circuit 105, and the external operation switch 109.

The filter 104 employs a band-pass filter, and is a circuit for setting the center of the filter 104 by a filter center setting circuit 105. The two filter center setting circuits 105 previously set two frequencies tuned to the rotation speed of the rotary machine 101, and select the center frequency of the filter 104 by switching each set frequency with the external operation switch 109. I can do it.

In the filter 104, the external operation switch 1
Signals other than the frequency selected in step 09 are removed. That is, the vibration component extraction unit 103 includes the external operation switch 10
Only the AC signal corresponding to the vibration amount of the frequency synchronized with the rotation speed of the rotary machine 101 selected by 9 is passed.

The signal passing through the vibration component extraction unit 103 is converted into a DC signal by a rectification / smoothing circuit 106,
A signal (0) corresponding to the measurement range of the vibration amount arbitrarily set
増 幅 4 VDC)
7 so that the unified signal becomes IV
In an addition circuit 108 for adding DC, the signal is converted into a unified signal of 1 to 5 VDC so as to be used by an externally connected instrument and output.

As described above, in the required vibration component extraction type vibration measuring apparatus of the present embodiment, the filter center setting circuit 1
The filter 104 set so as to pass only the frequency corresponding to the rotation speed of the rotary machine 101 in 05 removes all frequencies different from the frequency tuned to the rotation speed of the rotary machine 101, It is not affected by the signal of the frequency not tuned to the number, and only the signal of the frequency tuned to the rotation speed of the rotary machine 101 can be converted.

This makes it possible to accurately measure the amount of vibration without being affected by the amount of vibration at a frequency not synchronized with the rotation speed of the rotary machine 101. An external operation switch 109 is used to set two filter center setting circuits 105.
By switching between them, it is possible to easily cope with a case where there are two vibration amounts of the rotation speed of the rotating machine 101 to be measured.

Further, when the rotating machine 101 is operated,
When a certain number of revolutions has been reached from the start, once the revolution is fixed, it may be checked whether the rotating machine 101 is rotating smoothly. There is a way to raise.

In order to cope with this method, the frequency tuned to the rotation speed at the time of the first check and the frequency tuned to the rotation speed at the time of normal operation are set in each filter center setting circuit 105.
Set to.

By switching the external operation switch 109, a check from the start of the rotating machine 101 can be connected to the filter 104 at each timing to measure the vibration amount of the rotating machine 101.

(Third Embodiment) FIG. 3 is a block diagram showing a configuration example of a required vibration component extraction type vibration measuring device according to the present embodiment.

In FIG. 3, the rotating machine 201 output from the vibration detector 202 attached to the rotating machine 201
An AC signal that is proportional to the amount of vibration of the rotating shaft and the bearing stand is input to the vibration component extraction unit 203.

The vibration component extraction unit 203 includes a filter 204
, And a rotation speed conversion / setting circuit 211, and the AC signal output from the vibration detector 202 is
Pass through.

The rotation speed conversion / setting circuit 211 receives a rotation speed signal from a rotation speed detector 210 attached to the rotating machine 201 and capable of measuring the rotation speed. The signal that has passed through the filter 204 is converted into a DC signal by the rectification / smoothing circuit 206, and the amplification circuit 207 has an amplification degree such that the signal (0 to 4 VDC) corresponding to the arbitrarily set vibration amount measurement range is obtained. And a unified signal 1-5VDC
An addition circuit 208 adds 1 VDC so as to obtain 1 to 5 VDC, which is a unified signal that can be used by an externally connected instrument, and outputs the converted signal.

Next, the operation of the required vibration component extraction type vibration measuring device of the present embodiment configured as described above will be described. In FIG. 3, an AC signal output from a vibration detector 202 attached to the rotating machine 201 and proportional to the amount of vibration of the rotating shaft and the bearing stand of the rotating machine 201 is input to a vibration component extracting unit 203.

Then, the AC signal input to the vibration component extraction unit 203 is input to the filter 204 of the vibration component extraction unit 203 composed of the filter 204 and the rotation speed conversion / setting circuit 211.

The filter 204 employs a band-pass filter, and is a circuit for setting the center of the filter 204 by a rotation speed conversion / setting circuit 211. Rotation speed conversion
The setting circuit 211 receives a signal from a rotation speed detector 210 that measures the rotation speed of the rotary machine 201, converts the signal into a frequency synchronized with the rotation speed of the rotary machine 201,
04 center frequency is set.

The filter 204 removes frequencies other than those tuned to the rotation speed of the rotary machine 201. That is, the vibration component extraction unit 203 passes only the AC signal corresponding to the vibration amount of the frequency synchronized with the rotation speed of the rotary machine 201.

The signal that has passed through the vibration component extraction unit 203 is converted into a DC signal by the rectification / smoothing circuit 206.
A signal (0) corresponding to the measurement range of the vibration amount arbitrarily set
増 幅 4 VDC)
7 so that the unified signal becomes IV
In an addition circuit 208 for adding DC, the signal is converted into a unified signal of 1 to 5 VDC so as to be used by an externally connected instrument and output.

As described above, in the required vibration component extraction type vibration measuring apparatus of the present embodiment, the vibration detector 202 and the rotation speed detector 210 are attached to the rotating machine 201. The frequency of the AC signal for measuring the output vibration amount and the signal output from the rotation speed detector 210 are filtered by the rotation speed conversion / setting circuit 211 by the filter 2.
04 has the same value as the frequency to set the center frequency,
The signal passing through the filter 204 is a signal corresponding to the amount of vibration at a frequency synchronized with the ever-changing rotation speed of the rotating machine 201.

The filter 20 is set to pass only the frequency corresponding to the rotation speed of the rotary machine 201.
4 removes all frequencies different from the frequency tuned to the rotation speed of the rotating machine 201,
It is not affected by the signal of the frequency which is not tuned to the rotation speed of 1, so that only the signal of the frequency tuned to the rotation speed of the rotary machine 201 can be converted.

As a result, accurate measurement of the vibration amount can be performed without being affected by the vibration amount at a frequency not synchronized with the rotation speed of the rotary machine 201. (Fourth Embodiment) FIG. 4 is a block diagram showing a configuration example of a required vibration component extraction type vibration measuring device according to the present embodiment.

In FIG. 4, the rotating machine 301 output from the vibration detector 302 attached to the rotating machine 301
An AC signal that is proportional to the amount of vibration of the rotating shaft or the bearing stand is input to the vibration component extraction unit 303.

The vibration component extraction unit 303 includes a rotation speed conversion / setting circuit 311, a rotation speed conversion / setting circuit 312 for doubling the set frequency, and a rotation speed conversion / setting circuit for １ ／ times. 313, a total of three filters 304 corresponding to the respective circuits, and a superimposing circuit 314 for superimposing signals respectively output from the three filters 304. The AC signal output from the vibration detector 302 is a filter 304. Pass through.

Also, a rotation speed conversion / setting circuit 311, a rotation speed conversion / setting circuit 312, a rotation speed setting / conversion circuit 313
Inputs a rotation speed signal from a rotation speed detector 310 which is attached to the rotating machine 301 and whose rotation speed can be measured.

The signal passed through the three filters 304 is
After being superimposed by the superimposition circuit 314, the rectification / smoothing circuit 306 converts the signal into a DC signal, and the amplification circuit has an amplification degree such that a signal (0 to 4 VDC) corresponding to an arbitrary set vibration amount measurement range is obtained. Amplify at 307 and unify signals 1 to
Adder circuit 30 for adding 1 VDC so as to be 5 VDC
In step 8, the signal is converted into 1 to 5 VDC, which is a unified signal that can be used by an externally connected instrument, and output.

Next, the operation of the required vibration component extraction type vibration measuring device of the present embodiment configured as described above will be described. In FIG. 4, an AC signal output from a vibration detector 302 attached to the rotating machine 301 and proportional to the amount of vibration of the rotating shaft or the bearing stand of the rotating machine 301 is input to a vibration component extracting unit 303.

The AC signal input to the vibration component extraction unit 303 is input to three filters 304. Each of the filters 304 employs a band-pass filter, and is a circuit for setting the center of each filter 304 by a rotation speed conversion / setting circuit 311, a rotation speed conversion / setting circuit 312, and a rotation speed conversion / setting circuit 313. is there.

A rotation speed conversion / setting circuit 311 receives a signal from a rotation speed detector 310 for measuring the rotation speed of the rotary machine 301, converts the signal into a frequency synchronized with the rotation speed of the rotary machine 301, Set the center frequency of.

Similarly, the rotation frequency conversion / setting circuit 312 uses twice the frequency of the rotation number conversion / setting circuit 311, and the rotation number conversion / setting circuit 313 uses half the frequency of the rotation number conversion / setting circuit 311. Is set as the center frequency of the filter 304 connected to each circuit.

In the three filters 304, the rotary machine 30
The signals other than the frequency tuned to the rotation speed of 1 and the frequencies twice and half the frequency are removed, and the signals passing through the filters 304 are superimposed by the superimposing circuit 314.

That is, the vibration component extraction unit 303 passes only the AC signal corresponding to the frequency tuned to the rotation speed of the rotary machine 301 and the vibration amount of twice and 1/2 the frequency.

The signal that has passed through the vibration component extraction unit 303 is converted into a DC signal by a rectification / smoothing circuit 306,
A signal (0) corresponding to the measurement range of the vibration amount arbitrarily set
増 幅 4 VDC)
7 so that the unified signal becomes IV
An addition circuit 308 that adds DC converts the signal into a unified signal of 1 to 5 VDC so as to be used by an externally connected instrument, and outputs the converted signal.

As described above, in the required vibration component extraction type vibration measuring apparatus of the present embodiment, the vibration detector 302 and the rotation speed detector 310 are attached to the rotating machine 301. The frequency of the AC signal for measuring the output vibration amount and the signal output from the rotation speed detector 310 are filtered by the rotation speed conversion / setting circuit 311 by the filter 3.
04 has the same value as the frequency to set the center frequency,
Since the signal passing through the filter 304 is a signal corresponding to the amount of vibration of the frequency synchronized with the ever-changing rotation speed of the rotating machine 301, the signal is set to pass only the frequency corresponding to the rotation speed of the rotating machine 301. Filter 304
As a result, all frequencies different from the frequency tuned to the rotation speed of the rotary machine 301 are removed, so that it is not affected by the signal of the frequency not tuned to the rotation speed of the rotary machine 301, and the rotation of the rotary machine 301 is prevented. Only signals of frequencies tuned to the number can be converted.

As a result, it is possible to accurately measure the amount of vibration without being affected by the amount of vibration at a frequency not synchronized with the rotation speed of the rotary machine 301. In addition, rotating machine 3
The amount of vibration generated from 01 is the signal tuned to the rotation speed, the largest value of which is the signal, but the signal that is a significant point in measuring the amount of vibration like the signal is
Since the frequency is doubled and the signal is doubled in frequency, the center frequency of the remaining two filters 304 is set by the rotation speed conversion / setting circuit 312 and the rotation speed conversion / setting circuit 313, and the superposition circuit 314 By superimposing the signals passing through the three filters 304, it is possible to perform the measurement while suppressing the point for measuring the vibration amount.

(Fifth Embodiment) FIG. 5 is a block diagram showing a configuration example of a required vibration component extraction type vibration measuring apparatus according to the present embodiment.

In FIG. 5, a rotating machine 401 output from a vibration detector 402 attached to the rotating machine 401
An AC signal proportional to the amount of vibration of the rotating shaft and the bearing stand is input to the filter bypass unit 415.

The filter bypass unit 415 includes a rotation speed conversion / switching circuit 416 and a filter bypass switch 4.
17 is comprised. This filter bypass unit 415
Is input to the rotating machine 401, a rotation speed conversion / switching circuit 416 for inputting a rotation speed signal from a rotation speed detector 410 capable of measuring the rotation speed,
Whether to input to the vibration component extraction unit 403 or to bypass is selected by the filter-by-pass switch 417, and if bypassed, to the rectification / smoothing circuit 406.

The vibration component extraction unit 403 includes a rotation speed conversion / setting circuit 411, a rotation speed conversion / setting circuit 412 for doubling the set frequency, and a rotation speed conversion / setting circuit for １ ／. 413, a total of three filters 404 corresponding to the respective circuits, and a superimposing circuit 414 for superimposing signals output from the three filters 404, respectively.

A rotation speed conversion / setting circuit 411, a rotation speed conversion / setting circuit 412, a rotation speed setting / conversion circuit 413
Inputs a rotation speed signal from a rotation speed detector 410 attached to the rotating machine 401 and capable of measuring the rotation speed.

The signal that has passed through the three filters 404 is
After being superimposed by the superimposing circuit 414, the signal passes through the filter bypass switch 417 and passes through the rectifying / smoothing circuit 406.
And converted to a DC signal by the rectification / smoothing circuit 406,
A signal (0) corresponding to the measurement range of the vibration amount arbitrarily set
４4 VDC)
7 and 1 VD so that the unified signal becomes 1 to 5 VDC.
An addition circuit 408 that adds C converts the signal into 1 to 5 VDC, which is a unified signal that can be used by an externally connected instrument, and outputs the signal.

Next, the operation of the vibration measuring device for extracting necessary vibration components of the present embodiment configured as described above will be described. In FIG. 5, an AC signal output from a vibration detector 402 attached to the rotating machine 401 and proportional to the amount of vibration of the rotating shaft and the bearing stand of the rotating machine 401 is input to the filter bypass unit 415.

The AC signal input to the filter bypass unit 415 is used as a rotation speed detector 41 for measuring the rotation speed of the rotary machine 401 attached to the rotary machine 401.
Rotation speed conversion / switching circuit 416 for inputting a signal from 0
Thus, the filter bypass switch 417 selects whether to input to the vibration component extraction unit 403 or to bypass.

That is, the rotation speed conversion / switching circuit 416 determines whether or not the signal output from the rotation speed detector 410 exceeds the preset rotation speed.

As a result, when the rotation speed does not exceed the preset rotation speed, the filter bypass switch 417 is switched so as to bypass the vibration component extraction unit 403, and the AC signal is input to the rectification / smoothing circuit 406. To do it.

If the number of revolutions exceeds a preset number of revolutions, the filter bypass changeover switch 417 is switched so that an AC signal is input to the vibration component extraction unit 403.

On the other hand, the vibration detector 403 has
When the rotating machine 401 is started (immediately after the start of operation), the number of revolutions is low, so that it is difficult to measure the amount of vibration, and the amount of vibration of the rotating machine 401 itself is unlikely to be generated.

Therefore, the set value of the rotation speed conversion / switching circuit 416 is set to a frequency at which the vibration amount of the vibration detector 403 can be measured or a frequency at which the amount of vibration of the rotary machine 401 increases. Keep it.

The AC signal input to vibration component extraction section 403 is input to three filters 404. Each of the filters 404 employs a band-pass filter, and includes a rotation speed conversion / setting circuit 411 and a rotation speed conversion / setting circuit 41.
2. A circuit for setting the center of each filter 404 by a rotation speed conversion / setting circuit 413.

The rotation speed conversion / setting circuit 411 receives a signal from a rotation speed detector 410 for measuring the rotation speed of the rotary machine 401, converts the signal into a frequency synchronized with the rotation speed of the rotary machine 401, Set the center frequency of.

Similarly, the rotation speed conversion / setting circuit 412 uses twice the frequency of the rotation speed conversion / setting circuit 411, and the rotation speed conversion / setting circuit 413 uses the half frequency of the rotation speed conversion / setting circuit 411. Is set as the center frequency of the filter 404 connected to each circuit.

In the three filters 404, the rotary machine 40
The signals other than the frequency tuned to the rotation speed of 1 and the frequencies twice and お よ び thereof are removed, and the signals passing through the filters 404 are superimposed by the superimposing circuit 414.

That is, the vibration component extraction unit 403 allows only the AC signal corresponding to the frequency tuned to the rotation speed of the rotary machine 401 and the vibration amount of twice and half the frequency thereof to pass.

The signal that has passed through the vibration component extraction unit 403 is converted into a DC signal by the rectification / smoothing circuit 406,
A signal (0) corresponding to the measurement range of the vibration amount arbitrarily set
４4 VDC)
7 so that the unified signal becomes IV
An addition circuit 408 that adds DC converts the signal into a unified signal of 1 to 5 VDC so as to be used by an externally connected instrument and outputs the converted signal.

As described above, in the required vibration component extraction type vibration measuring apparatus of the present embodiment, the vibration detector 403 is activated when the rotating machine 401 is started (immediately after the start of operation) due to its characteristics.
Is difficult to measure the vibration amount because the rotation speed is low,
Although the vibration amount of the rotary machine 401 is less likely to be generated, the set value of the rotation speed conversion / switching circuit 416 of the filter bypass unit 415 is set to a frequency at which the vibration amount of the vibration detector 403 can be measured, or By setting the frequency at which the amount of vibration of 401 increases,
In the meantime, all the vibration components are measured, and the vibration amount can be measured. When the signal from the rotation speed conversion / switching circuit 416 is used, the filter bypass switch 417 is switched to change the vibration of the rotating machine 401. It is possible to measure the amount by tuning the frequency to the number of revolutions and to extract the frequency.

Further, the vibration detector 40 is attached to the rotating machine 401.
2 and the rotation speed detector 410 are attached, so that the frequency of the AC signal for measuring the amount of vibration output from the vibration detector 402 and the signal output from the rotation speed detector 410 are converted into a rotation speed conversion / setting circuit. At 411, the frequency for setting the center frequency of the filter 404 becomes the same value,
Since the signal passing through 04 is a signal corresponding to the vibration amount of the frequency synchronized with the ever-changing rotation speed of the rotating machine 401, the signal is set to pass only the frequency corresponding to the rotation speed of the rotating machine 401. Filter 404,
Since all frequencies different from the frequency tuned to the rotation speed of the rotary machine 401 are removed, the signal is not affected by the signal of the frequency not tuned to the rotation speed of the rotary machine 401. Only signals of the tuned frequency can be converted.

As a result, accurate measurement of the vibration amount can be performed without being affected by the vibration amount of a frequency that is not synchronized with the rotation speed of the rotary machine 401. Further, the vibration amount generated from the rotary machine 401 has the largest value in the signal tuned to the rotation speed, and a signal which is a significant point in measuring the vibration amount similarly to the signal is the frequency. Is a signal that is doubled and a signal that is 倍 times larger, the center frequency of the remaining two filters 404 is set by the rotation speed conversion / setting circuit 412 and the rotation speed conversion / setting circuit 413, By superimposing the signals passing through the three filters 404, it is possible to perform measurement while suppressing the point at which the vibration amount is measured.

(Sixth Embodiment) FIG. 6 is a block diagram showing a configuration example of a required vibration component extraction type vibration measuring apparatus according to the present embodiment.

In FIG. 6, an alternating current proportional to the vibration amount of the rotating shaft and the bearing stand of the rotary machine 501 output from the low frequency vibration detector 518 and the high frequency vibration detector 519 attached to the rotary machine 501. The signal is supplied to the detector switching unit 5
20 respectively.

The detector switching section 520 includes a rotation speed conversion / switching circuit 516 and a detector switching switch 521. The rotation speed conversion / switching circuit 516 includes a rotating machine 501.
And a rotation speed signal from a rotation speed detector 510 whose rotation speed can be measured.

The detector switching section 520 switches and selects an AC signal output from one of the low-frequency vibration detector 518 and the high-frequency vibration detector 519, and outputs the signal to the vibration component extracting section 503. input.

The vibration component extraction unit 503 includes a rotation speed conversion / setting circuit 511, a rotation speed conversion / setting circuit 512 for doubling the set frequency, and a rotation speed conversion / setting circuit for １ ／. 513, a total of three filters 504 corresponding to the respective circuits, and a superimposing circuit 514 for superimposing signals output from the three filters 504, respectively.

Also, a rotation speed conversion / setting circuit 511, a rotation speed conversion / setting circuit 512, a rotation speed setting / conversion circuit 513
Inputs a rotation speed signal from a rotation speed detector 510 attached to the rotary machine 501 and capable of measuring the rotation speed.

The signal that has passed through the three filters 504 is
After being superimposed by the superimposition circuit 514, the rectification / smoothing circuit 506 converts the signal into a DC signal, and the amplification circuit has an amplification degree such that a signal (0 to 4 VDC) corresponding to an arbitrarily set measurement range of the vibration amount is obtained. Amplify at 507 and unify signals 1 to
Adder circuit 50 for adding 1 VDC so as to be 5 VDC
In step 8, the signal is converted into 1 to 5 VDC, which is a unified signal that can be used by an externally connected instrument, and output.

Next, the operation of the required vibration component extraction type vibration measuring apparatus of the present embodiment configured as described above will be described. In FIG. 6, a low-frequency vibration detector 518 and a high-frequency vibration detector 5 attached to a rotating machine 501 are shown.
The AC signal proportional to the amount of vibration of the rotating shaft of the rotary machine 501 and the bearing pedestal, which is output from the control unit 19, is input to the detector switching unit 520.

In the rotation speed conversion / switching circuit 516 of the detector switching unit 520, either the low frequency vibration detector 518 or the high frequency vibration detector 519 is operated in accordance with the rotation speed signal from the rotation speed detector 510. An AC signal output from one of the detectors is selected by a detector changeover switch 521,
It is input to the vibration component extraction unit 503.

That is, in the rotation speed conversion / switching circuit 516, the detector switching switch is a frequency value for switching so as to selectively use the difference in the detection frequency range between the low frequency vibration detector 518 and the high frequency vibration detector 519. 521
The switching signal is sent to.

The AC signal input to vibration component extraction section 503 is input to three filters 504. Each of the filters 504 employs a band-pass filter, and includes a rotation speed conversion / setting circuit 511 and a rotation speed conversion / setting circuit 51.
2. A circuit for setting the center of each filter 504 in a rotation speed conversion / setting circuit 513.

The rotation speed conversion / setting circuit 511 receives a signal from a rotation speed detector 510 for measuring the rotation speed of the rotary machine 501, converts the signal into a frequency tuned to the rotation speed of the rotary machine 501, and outputs a filter 504. Set the center frequency of.

Similarly, the rotation frequency conversion / setting circuit 512 sets the frequency twice that of the rotation number conversion / setting circuit 511, and the rotation number conversion / setting circuit 513 sets the frequency twice as high as that of the rotation number conversion / setting circuit 511. Is set as the center frequency of the filter 504 connected to each circuit.

In the three filters 504, the rotary machine 50
A frequency other than the frequency tuned to the number of rotations of 1 and frequencies twice and そ の of the frequency are removed, and the signals passing through the filters 504 are superimposed by the superimposing circuit 514.

That is, the vibration component extraction unit 503 passes only the AC signal corresponding to the frequency tuned to the rotation speed of the rotary machine 501 and the vibration amount of twice and half the frequency.

The signal that has passed through the vibration component extraction unit 503 is converted into a DC signal by a rectification / smoothing circuit 506,
A signal (0) corresponding to the measurement range of the vibration amount arbitrarily set
増 幅 4 VDC)
7 so that the unified signal becomes IV
An addition circuit 508 for adding DC converts the signal into 1 to 5 VDC, which is a unified signal, and outputs the converted signal so that it can be used by an externally connected instrument.

As described above, in the required vibration component extraction type vibration measuring apparatus of the present embodiment, the low frequency vibration detector 518 and the high frequency vibration detector 519 are mounted on the rotating machine 501.
And the rotation number detector 510 are attached, the low frequency vibration detector 518 and the high frequency vibration detector 519 are provided.
The frequency of the AC signal that measures the amount of vibration output from the
The signal output from the rotation speed detector 510 is converted into a rotation speed.
The frequency at which the center frequency of the filter 504 is set by the setting circuit 511 has the same value. Therefore, the filter 504 set to pass only the frequency corresponding to the number of rotations of the rotating machine 501 causes the rotating machine 501 to rotate.
Since all frequencies different from the frequency tuned to the rotation speed of the rotary machine 501 are removed, the signal of a frequency not tuned to the rotation speed of the rotary machine 501 is not affected.
Only the signal of the frequency tuned to the number of rotations of 1 can be converted.

As a result, it is possible to accurately measure the amount of vibration without being affected by the amount of vibration at a frequency not synchronized with the rotation speed of the rotary machine 501. In addition, the rotating machine 5
The amount of vibration generated from 01 is the signal tuned to the rotation speed, the largest value of which is the signal, but the signal that is a significant point in measuring the amount of vibration like the signal is
Since the frequency is doubled and the signal is doubled in frequency, the center frequency of the remaining two filters 504 is set by the rotation speed conversion / setting circuit 512 and the rotation speed conversion / setting circuit 513, and the superposition circuit 514 is set. By superimposing the signals passing through the three filters 504, it is possible to perform the measurement while suppressing the point for measuring the vibration amount.

Further, the low frequency vibration detector 518 and the high frequency vibration detector 519 are attached for measuring the vibration amount of the rotary machine 501, so that the fifth embodiment described above can be used. Taking into account the detector frequency characteristics,
A function of bypassing the vibration component extraction unit 503 is not required, and the function can be used in the entire rotation speed range from the start of the rotary machine 501.

(Other Embodiments) (a) The function of the filter bypass in the above-described fifth embodiment can be applied to any of the above-described first to fourth embodiments. It is possible to

(B) The switching function of the vibration detector according to the sixth embodiment can be applied to any of the first to fourth embodiments. is there.

[0113]

As described above, according to the required vibration component extracting type vibration measuring apparatus of the present invention, an AC signal which is attached to a rotating machine and is proportional to the vibration amount of the rotating shaft and the bearing stand of the rotating machine is obtained. Since only the AC signal corresponding to the vibration amount of the frequency synchronized with the rotation speed of the rotating machine is extracted from the AC signal output from the output vibration detector, it is not synchronized with the rotation speed of the rotating machine. It is possible to accurately measure the vibration amount without being affected by the vibration amount of the frequency.

Further, according to the required vibration component extraction type vibration measuring device of the present invention, the AC signal output from the vibration detector is tuned to the rotation speed at the time of the first check when the rotating machine is operated. Since the frequency and the AC signal corresponding to the two vibration amounts of the frequency synchronized with the rotation speed during normal operation are extracted, even when there are two vibration amounts of the rotation speed to be measured of the rotating machine, It is possible to easily respond.

Further, according to the required vibration component extraction type vibration measuring apparatus of the present invention, the frequency tuned to the rotation speed of the rotary machine and the frequency of the frequency of the AC signal output from the vibration detector are adjusted to 2
Since the AC signal corresponding to the vibration amount of the double and 1/2 frequency is extracted, it is possible to perform the measurement while suppressing the point for measuring the vibration amount.

On the other hand, according to the required vibration component extracting type vibration measuring device of the present invention, when the rotating speed of the rotating machine is low, an AC signal corresponding to the vibration amount of the frequency synchronized with the rotating speed of the rotating machine is extracted. As a result, while the rotational speed of the rotating machine is low, it is possible to measure all vibration components and measure the amount of vibration.

According to the required vibration component extraction type vibration measuring apparatus of the present invention, a vibration detector for low frequency and a vibration detector for high frequency are installed as vibration detectors, respectively.
The low frequency vibration detector and the high frequency vibration detector are switched according to the rotation speed of the rotating machine.Therefore, bypass means for bypassing the vibration component extraction function in consideration of the frequency characteristics of the vibration detector is required. It is no longer necessary, and functions can be used in the entire rotation speed range from the start of the rotating machine.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a required vibration component extraction type vibration measuring device according to the present invention.

FIG. 2 is a block diagram showing a second embodiment of the required vibration component extraction type vibration measuring device according to the present invention.

FIG. 3 is a block diagram showing a required vibration component extraction type vibration measuring device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a fourth embodiment of the required vibration component extraction type vibration measuring device according to the present invention.

FIG. 5 is a block diagram showing a fifth embodiment of a required vibration component extraction type vibration measuring apparatus according to the present invention.

FIG. 6 is a block diagram showing a sixth embodiment of the required vibration component extraction type vibration measuring device according to the present invention.

FIG. 7 is a block diagram showing a configuration example of a conventional vibration measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotating machine, 2 ... Vibration detector, 3 ... Vibration component extraction part, 4 ... Filter, 5 ... Filter center setting circuit, 6 ... Rectifying / smoothing circuit, 7 ... Amplifier circuit, 8 ... Addition circuit, 101 ... Rotating machine , 102: Vibration detector, 103: Vibration component extraction unit, 104: Filter, 105: Filter center setting circuit, 106: Rectification / smoothing circuit, 107: Amplifier circuit, 108: Addition circuit, 109: External operation switch, 201: Rotating machine, 202: vibration detector, 203: vibration component extraction unit, 204: filter, 206: rectification / smoothing circuit, 207: amplification circuit, 208: addition circuit, 210: rotation speed detector, 211: rotation speed conversion / Setting circuit, 301: rotating machine, 302: vibration detector, 303: vibration component extraction unit, 304: filter, 306: rectifying / smoothing circuit, 307: amplifier circuit 308, an addition circuit, 310, a rotation speed detector, 311, a rotation speed conversion / setting circuit, 312, a rotation speed conversion / setting circuit, 313, a rotation speed conversion / setting circuit, 314, a superposition circuit, 401, a rotating machine, 402: vibration detector, 403: vibration component extraction unit, 404: filter, 406: rectification / smoothing circuit, 407: amplification circuit, 408: addition circuit, 410: rotation speed detector, 411: rotation speed conversion / setting circuit, 412: rotation speed conversion / setting circuit; 413: rotation speed conversion / setting circuit; 414: superimposition circuit; 415: filter bypass unit; 416: rotation speed conversion / cutting circuit; 417: filter bypass changeover switch; 503: Vibration component extractor 504: Filter 506: Rectifier / smoothing circuit 507: Amplifier circuit 508: Adder circuit 510: Rotation Number detector, 511: Revolution conversion / setting circuit, 512: Revolution conversion / setting circuit, 513: Revolution conversion / setting circuit, 514: Superposition circuit, 516: Revolution conversion / switching circuit, 518: For low frequency Vibration detector, 519: High frequency vibration detector, 520: Detector switching unit, 521: Detector switching switch.

Claims (6)

[Claims] An AC signal output from a vibration detector that is attached to a rotating machine and outputs an AC signal proportional to the amount of vibration of a rotating shaft or a bearing stand of the rotating machine is processed to rotate the rotating machine. In a vibration measuring device for measuring a vibration amount of a shaft or a bearing stand, an AC signal corresponding to a vibration amount of a frequency tuned to a preset rotation speed of the rotating machine with respect to an AC signal output from the vibration detector. A required vibration component extraction type vibration measuring device comprising a vibration component extraction means for extracting a signal. 2. An AC signal output from a vibration detector that is attached to a rotating machine and outputs an AC signal proportional to the amount of vibration of a rotating shaft or a bearing stand of the rotating machine, is processed to rotate the rotating machine. In a vibration measuring device that measures the amount of vibration of a shaft or a bearing stand, for an AC signal output from the vibration detector, a frequency tuned to a rotation speed at a first check when operating the rotating machine, and A required-vibration-component extraction-type vibration measuring device comprising: a vibration-component extracting unit that extracts an AC signal corresponding to two vibration amounts having a frequency synchronized with the rotation speed during normal operation. 3. An AC signal output from a vibration detector attached to the rotating machine and outputting an AC signal proportional to the amount of vibration of the rotating shaft or the bearing stand of the rotating machine is processed to rotate the rotating machine. In a vibration measuring device that measures the vibration amount of a shaft or a bearing stand, an AC signal output from the vibration detector is changed to a vibration amount of a frequency synchronized with the rotating speed of the rotating machine that changes every moment during operation. A vibration component extracting type vibration measuring apparatus comprising a vibration component extracting means for extracting a corresponding AC signal. 4. An AC signal output from a vibration detector which is attached to a rotating machine and outputs an AC signal proportional to the amount of vibration of a rotating shaft or a bearing stand of the rotating machine, is processed to rotate the rotating machine. In a vibration measuring device for measuring an amount of vibration of a shaft or a bearing stand, a frequency tuned to a rotation speed of the rotating machine and a frequency twice as high as 1 for an AC signal output from the vibration detector.
A required vibration component extraction type vibration measuring device, comprising: a vibration component extraction means for extracting an AC signal corresponding to a vibration amount having a frequency of / 2. 5. The method according to claim 1, wherein
In the required vibration component extraction type vibration measuring device according to the paragraph, when the rotation speed of the rotary machine is low, a vibration component extraction unit that extracts an AC signal corresponding to a vibration amount of a frequency synchronized with the rotation speed of the rotary machine. A required vibration component extraction type vibration measuring device, characterized by adding a bypass means for bypassing the vibration. 6. The method according to claim 1, wherein
In the required vibration component extraction type vibration measuring device according to the item, as a vibration detector that outputs an AC signal proportional to the amount of vibration of the rotating shaft and the bearing stand of the rotating machine, a vibration detector for low frequency and a vibration detector for high frequency And a detector switching means for switching between the low-frequency vibration detector and the high-frequency vibration detector in accordance with the rotation speed of the rotating machine. Vibration component extraction type vibration measurement device.