JPH02234298A - Facility accident detecting device - Google Patents

Abstract

PURPOSE:To effectively detect an accident by supervising plant facility equipment according to the degree of secular deterioration in a suitable cycle. CONSTITUTION:A facility accident detecting device 3 is provided with a supervising/collecting device 4, which inputs signals from respective sensors 2a, 2b,... and A/D-converts the signals, an accident deciding device 5, which decides the occurrence of the accident based on data from the supervising/ collecting device 4, a decision result output device 6 to output a decision result, and further a supervisory variable device 7, which alters a plant supervisory cycle based on the accident decision result of the accident deciding device 5. At the beginning of the activation of plant equipment 1a, 1b,... having the small possibility of the accident occurrence, the supervising cycle is made longer, and when the possibility of the accident occurrence becomes larger, the supervising cycle is made shorter. Thus waste to frequently supervise a plant to discover the accident when the accident occurrence possibility is small can be eliminated, and the efficient plant supervision is attained.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Field of Industrial Application) This invention monitors the status of equipment in plants, such as industrial monitoring and control systems and water and sewage monitoring and control systems, and detects their failures. The present invention relates to an equipment failure detection device that detects the degree of failure in advance and notifies the outside.

(Prior Art) Conventionally, as an equipment failure detection device for, for example, an industrial supervisory control system or a water supply/sewerage supervisory control system, a configuration as shown in FIG. 4 is known.

This conventional equipment failure detection device detects plant equipment such as bombs and motors 1a, 1b,]. The state signals such as voltage, current, vibration, etc. of c,... are sent to each sensor 2a.
, 2b, 2c, . . . , the equipment inspection equipment 3
The monitoring and collection device 4 is manually operated.

The monitoring and collection device 4 is shown in FIG. The state from the sensor 2 a + 2 b + 2 Cr (g to: ~) is read constantly or at an appropriate constant cycle T0, A/D converted, and provided to the failure determination device 5. There is.

This failure determination device 5 compares the data from the monitoring and collection device 4 with a preset threshold value x,,X, indicating the degree of failure, and determines the degree of failure. and,
The judgment result is outputted in one judgment result (in the output section 6, by a display device or a printer, and if necessary, the operator is notified by outputting an alarm sound.

(Problem to be solved by the invention) However, with such conventional equipment failure detection equipment, it is rare for a failure, especially in plant equipment, to suddenly lead to destruction, and it is difficult to detect failures due to deterioration over time. Therefore, in order to detect aging failures or signs of failure in plant equipment, it is not necessary to use constant or frequent cycles T.

The problem is that there is no need to monitor the plant equipment, resulting in unnecessary monitoring operations.

This invention was made in view of such conventional problems, and it is possible to effectively detect equipment failure by monitoring plant equipment at appropriate intervals depending on the degree of deterioration over time. The purpose of LI is to provide a detection device.

[Structure of the Invention] (Means for Solving the Problems) The equipment failure detection device of the present invention includes a monitoring and collecting means that periodically monitors the status of the equipment and collects the data, and a monitoring and collecting means that collects the data. a failure determination means for determining the degree of failure based on the failure determination means; an output means for outputting the failure determination result of the failure determination means; and an equipment status monitoring period of the monitoring and collection means according to the degree of failure determined by the failure determination means. and monitoring period variable means for making the monitoring period variable.

(Function) Generally, plans for pumps, motors, etc.] - Due to aging deterioration of equipment, the longer it is used, the greater the vibration and noise, and it is easy to predict the occurrence of failure in the near future or the end of its life. be.

Therefore, in the equipment failure detection device of the present invention, when the equipment is started up, equipment monitoring data is collected while monitoring the status of the equipment at a relatively low frequency using the equipment monitoring and collecting means. Then, based on the data obtained by the monitoring and collecting means, the failure determining means determines whether or not a failure has occurred.

For example, if the vibration amplitude is increasing or the noise is increasing to the point that it exceeds the threshold, it means that the product is nearing the end of its life due to aging, or that a failure may occur in the near future. By determining that the condition has been reached, and increasing the inspection period of the plant equipment, a command to change the monitoring period is issued to the monitoring period variable means so that finer grained brano 1 and monitoring can be performed. .

Therefore, the monitoring cycle variable means receives this command and increases the 'C monitoring cycle, thereby causing the monitoring collection means to collect the monitoring data of the plant equipment at a more frequent cycle.

In this way, in situations where failures are relatively unlikely to occur, the plant monitoring frequency is kept low to avoid wasteful monitoring operations as much as possible, and when plant equipment is nearing the end of its service life or a failure is likely to occur in the near future. To enable efficient and effective plant monitoring by increasing the plant monitoring cycle when the condition occurs.

(Example) Hereinafter, embodiments of the present invention will be explained in detail based on the drawings.

FIG. 1 shows an embodiment of the present invention, in which plant equipment such as pumps and motors (iiifl, a, lb, l)
Sensors 2a, 2b, 2c, . . . detect various process values and state data such as current, voltage, vibration, noise, etc., and manually send them to equipment failure detection device 3.

The equipment failure detection device 3 includes each of the sensors 2a. 2b, 2c
A monitoring and collecting device 4 inputs signals from , . It is equipped with a determination result output device 6 and a monitoring cycle variable device 7 that changes the plant monitoring cycle based on the failure determination result of the failure determination device 5.

The failure determination device 5 includes a frequency analysis unit 8 that manually inputs data from the monitoring and collection device 4 to determine failures of remote motors and pumps using vibration analysis, and performs frequency analysis using fast Fourier transform. A comparison section 9 compares the signal from the analysis section 8 with the threshold value X1x2 of the deterioration curve shown in FIG.
b + IC+ .

Next, the operation of the equipment failure detection device having the above configuration will be explained.

Now, when we consider pumps as equipment to be monitored, they wear out based on the aging curve shown in Figure 3.

Therefore, the monitoring period variable device 7 sets the period T1 so that the plant is monitored at the initial period T, and the monitoring and collection device 4 is configured to set the period T1 so that the plant monitoring is performed at the initial period T, and the monitoring period variable device 7 sets the period T1 so that the plant monitoring is performed at the initial period T, and the monitoring period variable device 7 sets the period T1 so that the plant monitoring is performed at the initial period T. It instructs to take in data from b, 2c + .

The monitoring and collection device 4 A/D converts the data from the sensors 2a, 2b, 2c, . . . and manually inputs the data to the failure determination device 3 to determine a failure (step S3).

The failure determination operation in this failure determination device 3 is as follows.

First, sensor 2a. The vibration data from 2b, 2c, .

The comparator 9 has predetermined frequency band intensity thresholds X+, X2 (X+: first degree of failure (a state in which a failure is expected to occur in the near future) x2:
The second degree of failure (failure occurrence or end of life) is given and compared with the intensity of the corresponding frequency band of the analyzed vibration data.Then, the deterioration of the bomb progresses to point A, and the actual data is 111 has a large intensity exceeding the threshold value X1 in a specific frequency band, the failure determination unit 10
It is determined that the service life is approaching or a failure will occur in the near future, and a failure determination result is output to the determination result output device 6, and a cycle change command is output to the monitoring cycle variable device 7 (steps S4, S5).

Based on the command from the failure determination device 3, the monitoring cycle variable device 7 changes the monitoring cycle to T2 in order to increase the monitoring frequency, and operates each equipment 1, a, lblc, . . . at an even higher frequency.
(Step 3.6).

When the deterioration of the pump progresses further and reaches point B, the la, 1. By monitoring b, lc, . . . every cycle T2, a failure determination result exceeding the threshold value X2 is output, it is determined that a failure has occurred or the life has come to an end, and a failure response command is outputted from the output device 6. Inform workers.

In this way, the degree of failure and deterioration of equipment is determined, and if the equipment is nearing failure or the end of its life, the monitoring cycle is increased to a more frequent one, and failure monitoring is performed. can be done more precisely.

In the above embodiment of the present invention, the monitoring cycle is set to T.
I set it to two T2, but this is even more detailed < T+
．． It can also be divided into T2, T3, T4, .

In the above embodiment, the failure of the bomb was determined based only on the vibration data among the data to be monitored and collected. However, generally in Plan 1 equipment, multiple data such as voltage, voltage, etc. are monitored. Process values such as current and noise can be monitored.

[Effects of the Invention] As described above, according to the present invention, the plant setting IQ j:8. 'a:
：Since the monitoring period is variable, the monitoring period is lengthened at the beginning of plant startup when the possibility of failure occurring is small, and the monitoring period is increased when the possibility of failure becoming high (). This eliminates the waste of busy plant monitoring for failure monitoring when the possibility of failure occurring is small, and enables efficient plant monitoring.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a flowchart showing the operation of the above embodiment, and Fig. 3 is a graph showing the relationship between the platelet monitoring cycle and the deterioration curve used in the above embodiment. , Fig. 4. ...Plan...Sensor 4...Monitoring and collection device 6...Judgment result output device 8...Frequency analysis section 0...Failure judgment section The figure is block la of the conventional example. , lb, lc, 2 a + 2 b + 2 c, 3...Failure detection device 5...Failure determination device 7...Monitoring period variable device 9...Comparison section equipment

Claims (1)

[Claims] A monitoring and collecting means that periodically monitors the condition of the equipment and collects the data; a failure determining means that determines the degree of failure based on the data of the monitoring and collecting means; and a failure determining means that determines the degree of failure determined by the failure determining means. An equipment failure detection device comprising an output means for outputting to the outside, and a monitoring cycle variable means for varying the equipment status monitoring cycle of the monitoring and collecting means according to the degree of failure determined by the failure determination means.