JPS5892828A - Monitoring device for operation state - Google Patents

Abstract

PURPOSE:To detect even a slight abnormality of the operation state, by comparing continuously the storage value of a storage device with a new result of the frequency analysis due to an analyzing device in every frequency component. CONSTITUTION:Detection signals of shake detectors 5 attached to bearings 4 supporting end parts of a rotation shaft 3 are amplified in preamplifiers 7 and are sent to signal converters 8 and are converted to signals suitable for frequency analysis and are inputted to a signal switch 9. If the signal switch 9 is switched to the automatic monitor mode, signals of two signal converters 8 are sent to a frequency analyzing device 10 at different timings at intervals of a designated monitor time. If the signal switch 9 is switched to the manual monitor mode, these signals are sent to the frequency analyzing device 10 after a time required for manual monitor is elapsed simultaneously with switching. These signals are subjected to frequency analysis in the frequency analyzing device 10, and results are stored in a device 11 and are compared with values which are obtained after the lapse of a prescribed time.

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a transmission device 1t using a rotating electric machine or a friction mechanism.
The present invention relates to an operating state monitoring device that monitors the operating state of an fP.

TECHNICAL BACKGROUND OF THE INVENTION In general, when monitoring the operating status of rotating electric machines, transmission devices using friction mechanisms, etc., there are known methods such as detecting the temperature of a bearing or detecting the vibration amplitude of a shaft. There is.

Among these, when detecting the temperature of a bearing, a heat-sensitive element such as a thermocouple or thermistor is installed in the bearing, and the temperature rise in the bearing due to abnormal operating conditions of the equipment is detected, and the detected value is set. Measures are taken to generate an abnormality alarm when the value exceeds 9.

On the other hand, when detecting the vibration amplitude of a shaft, a velocity-type vibration detector or a displacement-type vibration detector is used to convert the vibration amplitude of the shaft into an electrical signal and detect the unique frequency components that occur due to equipment abnormalities. 4L is output, and when the effective value exceeds the set value, an abnormality alarm is generated.

Problems with the Background Art However, in all of the above-mentioned methods, an alarm is issued only when it is dangerous to continue operating the equipment due to damage, so Therefore, even if the detection signal gradually increases depending on the degree of damage, appropriate measures were not taken.

Therefore, even for equipment equipped with the above-mentioned monitoring equipment, it is necessary for a supervisor to go to the equipment to be monitored, touch it directly to check its temperature, and listen to the operating noise. In that sense, it did not fulfill its role as a monitoring device.

On the other hand, even if the equipment is equipped with the above-mentioned monitoring device, regular inspections are essential, but 4!
It would be unreasonable to disassemble the equipment or inspect the inside of the bearing part of a device that has not even experienced any abnormality.

Therefore, there has been a strong desire for a monitoring device that can detect even minor abnormalities in operating conditions and the expansion of these abnormalities, and can also make advance predictions to some extent.

OBJECTS OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide an operating state monitoring device capable of detecting relatively minor operating state abnormalities of monitored equipment and the expansion of this operating state abnormality. .

Summary of the Invention In order to achieve the above object, the operating condition monitoring device of the present invention uses an acceleration type vibration detector which can also extract harmonic components of vibration compared to velocity type or displacement type vibration detection sensors.
The vibration state of the monitored equipment is extracted as an electrical signal, this electrical signal is frequency-analyzed by a frequency analyzer, and this analysis result is stored in a storage device. The new frequency analysis result is continuously compared for each frequency component by a comparator, and different types of alarm signals are generated when the difference exceeds a set value of multiple levels. Configure.

Embodiment of the Invention Hereinafter, an operating state monitoring device of the present invention will be described based on an embodiment with reference to the accompanying drawings.

Figure 1X1 is a book diagram showing the configuration of this embodiment together with the equipment to be monitored. (hereinafter simply referred to as a rotating device), 3 is a rotating shaft of the rotating device 2, 4 is a bearing that supports the rotating shaft 3, and 5 is an acceleration type vibration detector (hereinafter simply referred to as a vibration detector) consisting of a pressure 1 element. ), 6
7 is a cable that is shielded so as not to be affected by an external electric field or external magnetic field and transmits the detection signal of the vibration detector 5; 7 is a preamplifier that receives and amplifies the detection signal of the vibration detector 5; 8 is a preamplifier that amplifies the detection signal of the vibration detector 5; A conversion device 9 detects the output No. 1g of the preamplifier 8, removes the low frequency No. 48 accompanying ambient vibration, or amplifies it to a necessary level and converts it into a signal suitable for frequency analysis. A signal switcher 10 has a function of sequentially switching two signal converters 8 connected to vibration detectors 5 installed at both ends of the rotating shaft 30, and can select between automatic monitoring and manual monitoring; A frequency analyzer that analyzes the frequency of signals sequentially sent out through the switch 10, 11 a storage device that stores the frequency-analyzed results for each frequency component, and 12 that is linked to the signal switch i for automatic monitoring and manual monitoring. A signal switch 13 changes the data read timing of the storage device 11 by switching to one of the signals, and a signal switch 13 sequentially transmits the stored values of the storage device 11 and the results of new frequency analysis by the frequency analyzer for each frequency component. A comparator that performs continuous comparison and generates an alarm signal when the difference exceeds a set value, 14 is a public alarm device, and 15 is a recording device that records frequency analysis results on a cathode ray display tube or recording paper. . - The operation of the operating condition monitoring device 10 configured as described above is shown in FIG. 2(a).
The following description will be made with reference to the vibration distribution characteristic diagrams shown in (b) and (e).

First, vibration detection II is installed on each bearing 4 that supports the end of the rotating shaft 3! The detection signal of 5 is sent to the preamplifier 7.
This amplified signal is taken into the signal converter 8. This signal converter 8 converts these signals into signals suitable for frequency analysis and inputs the signals to a signal switch 9.

Here, if the signal switch 9 is switched to automatic monitoring, the signals of the two signal converters 8 are sent to the frequency analyzer 10 at different timings for each designated monitoring time. On the other hand, if the signal switch 9 is subject to manual monitoring,
At the same time as the switching, the signal of one signal converter 8 is first sent out, and then, after the time required for manual monitoring has elapsed, the signal of the other signal converter 8 is sent to the frequency minute digit value #L8.

The frequency analyzer 8 sends hf? through a signal switcher.
- Analyze the frequency of the signal almost instantaneously and store the result in the memory value [11. In this case, the memorized value [11] first memorizes the frequency analysis result during normal operation of the rotating equipment 2, and this memorized value can be left as it is and subsequent data, for example, every week or every month, can be memorized. I have a valley violet like that.

On the other hand, if the signal switch 9 has been switched to the automatic monitoring side, the signal switch 12 will also be switched to the automatic monitoring side, and the frequency analyzer lO will perform a new frequency analysis and compare the analysis results. Each time the data is added to the comparator 13, data in the storage device 11 (during normal operation) corresponding to the same frequency is added to the comparator 13.

Here, the comparator 13 continuously compares the two for each frequency component, and when the difference exceeds a set value, a warning *1= signal is generated and the alarm device 14 is activated. Automatic monitoring is thus performed.

Next, when the signal switchers 9 and 12 are switched manually (to felling), the frequency analyzer 10 itself almost instantaneously performs a frequency analysis of the sent signal. The interval at which data is sent out increases depending on the type of recording device 15.The data readout time of the memory 1dlll via the signal switch 12 is also adjusted to this, and the time during normal operation shown in Fig. 82(a) is adjusted accordingly. The frequency analysis data of the recording device 11 and the frequency analysis data at the monitoring time shown in FIG. 2(b) are recorded in the recording device 15 in a good superposition state as shown in FIG. 2(c). Ru.

This provides manual monitoring.

As is well known, since the rotating device 2 is composed of a plurality of lLl trees, it is conceivable that an abnormality may occur and a specific frequency component may become significantly louder depending on the location. Figure 2 (,
) indicates that the difference between normal operation and monitoring becomes large at 15 KHz and 25 KHz.

By the way, the difference between the signal levels during normal operation and during monitoring is sufficient to generate an alarm. In other words, the alarm level to be set varies depending on the characteristics of the monitored equipment and usage conditions. , 15KHz and 25KH mentioned above
If level differences in z inevitably appear depending on the usage history of the device, these level differences can be made standard.

In other words, the remill difference of the 15KHz component is aS25KHg
If the level difference between the two components is bl, and the level difference of other frequency components excluding these frequencies is D, then b≦D (a ・
・・・・・・・・・・・・・・・・・・ Song・(1
) for the relationship of the first degree *@, a≦D ・・・・・・・・・・・・・・・ Song...
By taking measures to generate a secondary alarm for the relationship in (2), not only abnormal driving conditions at Tokyo University but also
Even relatively minor abnormalities can be detected accurately.

In addition, the record-&1t15 is not limited to simply recording the chest wave number analysis results during normal operation and monitoring, but can also be used to read out data from the storage device 11 and reproduce it as necessary. Deterioration or aging of each constituent element can be investigated in detail without disassembly. In this sense, periodic inspections are simplified.

In addition, in the above embodiment, the bearing 4 supporting both ends of the rotating shaft 3 is
A vibration detector 5 is provided at each of the two, and the outputs of both are frequency-analyzed with a time difference by a signal switch 9. This is because the vibration amplitude at both ends of the rotating shaft 30 is Compared to the case where a vibration detector is provided only at one end of the rotating shaft 3, more detailed monitoring is possible.

(9) In the above embodiment, an acceleration-type vibration detector using a piezoelectric element as the vibration detector 5 has been described. Vibration monitoring similar to that described above is also possible using other inspection elements.

Effects of the Invention As is clear from the above explanation, the operating state monitoring device of the present invention enables detection of relatively minor operating state abnormalities of monitored equipment. In addition, if the frequency analysis data stored in the storage device and the frequency analysis data during monitoring are recorded on a cathode ray display tube or recorder, it is possible to detect the expansion of abnormal operating conditions, thereby making it possible to detect the deterioration of the monitored equipment. Deterioration or changes over time can be examined in detail without disassembly. This simplifies periodic inspections and reduces inspection time accordingly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the operating condition monitoring device according to the present invention, and FIG. It is. DESCRIPTION OF SYMBOLS 1... Foundation stand, 2... Rotating electrical equipment, 3... Rotating shaft, 4... Bearing, 5... Acceleration f-type vibration detector, 6...
... Cable, 7... Preamplifier, 8... Conversion device, 9.12... Communication. signal switching device, lO...frequency analyzer, 11...storage device, 13...comparator, 14...alarm device, 15.
··Storage device. Applicant's agent Kiyoshi Inomata

Claims (1)

[Claims] An acceleration vibration detector that detects imaging of monitored equipment, an analysis device that frequency-analyzes the output signal of this vibration detector, a storage device that stores the analysis results of this analysis device, and a memory value and It is characterized by being equipped with a comparator that continuously compares the frequency analysis results obtained by the 1ftl period analysis girl for each frequency component and generates an alarm signal when the difference exceeds a set value. Continuous operation status monitoring device.