JPS63173928A - Diagnosis system for rotating equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention targets rotating equipment driven by motors such as pumps, fans, and conveyors, and uses predetermined alarm settings based on vibration measurement values of the rotating equipment. This invention relates to a diagnostic system for rotating equipment that issues an alarm when a value is exceeded.

[Prior Art] Conventionally, in this type of diagnostic system, as shown in FIG. A vibration pickup 3 is connected to the input end of the channel switching unit 4, and a vibration analyzer 5 and an alarm device 6 are connected to the output end of the channel switching unit 4.
It is configured by connecting. An alarm lamp 7 and an alarm buzzer 8 are connected to the alarm device 6. Rotating equipment 2
If the groups are of different types, the alarm devices 6 corresponding to the rotating equipment 2 of each group of different types are connected.

The diagnostic system configured as described above sequentially inputs vibration detection signals from the respective vibration pickups 3 to the vibration analysis device 5 through the channel switching unit 4. This vibration analysis device 5 outputs the vibration measurement value to an alarm device 6, and the alarm device 6 issues an alarm with an alarm lamp 7 and an alarm buzzer 8 when the vibration measurement value exceeds a predetermined alarm setting value. emanate. The alarm setting value in the alarm device 6 is set to only one value LO as shown in FIG. Regardless of whether the vehicle is stopped (during a deceleration period) or not, the vibration measurement value at each time is compared with one alarm setting value LO.

[Problems to be Solved by the Invention] By the way, when the rotating equipment 2 starts up and decelerates and stops, as shown in FIG. occurs.

Therefore, despite normal operation, there is a problem in that the alarm setting value LO is exceeded at startup and deceleration and stop, causing an alarm to be issued inadvertently. In order to avoid such false alarms, it has been necessary for maintenance or inspection personnel to check the cause of the alarm and perform an alarm reset operation each time.

However, when a large number of rotating equipment 2 are to be diagnosed,
When the rotating equipment 2 that frequently repeats starting and stopping is targeted for diagnosis, false alarms occur frequently and normal operation is hindered.

Further, as a measure to prevent false alarms at the time of startup and deceleration/stop, there is a method of adding a relay circuit 9 as shown by a two-dot chain line in FIG.

The relay circuit 9 uses a timer 10 that turns on the output after a certain period of time after the ON signal of the motor 1 inputted from the auxiliary contact of the motor starter rises. sometimes relay 1
The alarm signal is turned off by opening the first contact. However, when such a method is adopted, the alarm function does not operate at all when the motor starts, decelerates and stops, resulting in a non-monitoring state and the problem that abnormal vibrations cannot be detected. . Moreover, in the important rotating equipment 2, an interlock circuit against abnormal vibrations at startup cannot be constructed, and the wiring becomes complicated due to the addition of the relay circuit 9.

This invention eliminates such problems.

[Means for Solving the Problems] A diagnostic system for rotating equipment of the present invention includes: a vibration analysis device that analyzes vibrations of rotating equipment and outputs vibration measurement values; a vibration measurement value of rotating equipment; A first alarm device that compares a predetermined alarm set value during steady rotation and issues an alarm when the measured vibration value exceeds the alarm set value; a second alarm device that compares the measured vibration value with the alarm set value during the acceleration period and issues an alarm when the measured vibration value exceeds the alarm set value; A third alarm device that issues an alarm when the measured vibration value exceeds the alarm setting value is compared with the alarm setting value inside, and the fundamental wave of the vibration frequency corresponding to the rotation speed of the rotating equipment is determined. When the fundamental wave has a frequency during steady rotation, the vibration measurement value is input to the first alarm device, and when the frequency of the fundamental wave is smaller than the fundamental wave frequency during steady rotation and increases in time series, the vibration measurement value is input to the first alarm device. An alarm in which the vibration measurement value is input to a second alarm device, and when the frequency of the fundamental wave is smaller than the fundamental wave frequency during steady rotation and decreases in time series, the vibration measurement value is input to the third alarm device. It is characterized by being equipped with a setting switching device.

[Operation] The diagnostic system for rotating equipment of the present invention detects values according to the operating conditions when the rotating equipment is in steady rotation, during an acceleration period, and during a deceleration period. Alarm set values are determined in advance, and those alarm set values are compared with actual vibration measurement values according to the operating conditions of rotating equipment, and when the vibration measurement value exceeds the alarm set value, By issuing an alarm, vibrations during the entire period from startup to 7-stop of rotating equipment can be monitored and appropriate responses can be taken.

[Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. Note that the same parts as those in the conventional example described above are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, 21 is a first alarm device, 22 is a second alarm device, and 23 is a third alarm device, which are connected to the output end of the channel switching unit 4 through a selection switch 24. An alarm lamp 7 and an alarm buzzer 8 are connected to each of the alarm devices 21, 22, and 23.

The first alarm device 21 compares the vibration measurement value of the rotating system equipment 2 inputted from the vibration analysis device 5 with a predetermined alarm setting value L1 during steady rotation, and compares the vibration measurement value with the alarm setting value L1.
When the value exceeds 1, a warning lamp 7 and a warning buzzer 8 issue an alarm. The alarm setting value Ll is a vibration value within a normal allowable range during steady rotation of the rotating equipment 2 (see FIG. 2). The second alarm device 22 compares the vibration measurement value of the rotating equipment 2 with an alarm setting value L2 during a predetermined acceleration period, and issues an alarm when the vibration measurement value exceeds the alarm setting value L2. A lamp 7 and an alarm buzzer 8 are used to issue an alarm. The alarm setting value L2 is a vibration value within the normal allowable range at the time of starting the rotating system equipment 2,
As shown in FIG. 2, the value changes according to the rotational speed of the rotating system equipment 2 during the startup period. The third alarm device 23 compares the vibration measurement value of the rotating equipment 2 with an alarm setting value L3 during a predetermined deceleration period, and issues an alarm when the vibration measurement value exceeds the alarm setting value L3. A lamp 7 and an alarm buzzer 8 are used to issue an alarm. Alarm setting value L
3 is a vibration value within the normal allowable range when the rotating equipment 2 decelerates and stops, and as shown in Fig. 2, it is a value that changes according to the rotational speed during the decelerating and stopping period of the rotating equipment 2. It has become.

These first. Second. The selection switch 24 between the third alarm device 21 , 22 , 23 and the vibration analysis device 5 is switched by a command from the alarm setting switching device 25 . This switching device 25 selects the frequency of the fundamental wave f0 in the vibration waveform and the fundamental wave f. It is determined whether the rotating equipment 2 is at startup, steady rotation, or deceleration and stop based on the time-series changes in the frequency, and the selection switch 24 is switched in accordance with the three determinations. The function of the switching device 25 is
The effect will be described later.

Next, the effect will be explained.

First, the vibration analysis device 5 analyzes the input vibration waveform (see Fig. 3).
a)) as the fundamental wave ro (Fig. 3(b)) and the harmonics f, .
f.

(Fig. 3 (c), (d)). The frequency of the fundamental wave f0 changes depending on the rotation speed of the rotating equipment 2. Therefore, the switching device 25 determines whether the frequency of the fundamental wave f0 is the frequency during steady rotation of the rotating system equipment 2, and if it is the frequency during steady rotation, the switching device 25 determines whether the frequency of the fundamental wave f0 is the frequency during steady rotation of the rotating system equipment 2, and if 2 is determined to be during steady rotation. Furthermore, the switching device 25
If the fundamental wave f0 is smaller than the frequency of the fundamental wave during steady rotation, observe the time-series change in the frequency, and when it increases, determine that the rotating system equipment 2 is at startup, When it decreases, it is determined that the rotating equipment 2 is decelerating and stopping.

Then, the switching device 25 switches the selection switch 24 to the first alarm device 21 side when determining that the rotating equipment 2 is in steady rotation, and switches the selection switch 24 to the first alarm device 21 side when determining that it is at startup. The selection switch 24 is switched to the second alarm device 22 side, and when it is determined that it is during deceleration and stop, the selection switch 24 is switched to the third alarm device 23 side. The first thing I want to do is. Second. Third alarm device 21.22
．． 23 sets alarm setting values L 1 , L 2 , L 3 that match the operating situation of the rotating system equipment 2;
The vibration measurement values from the vibration analysis device 5 will be compared. These alarm devices 21, 22, and 23 issue an alarm using the alarm lamp 7 and the alarm buzzer 8 when the measured vibration value exceeds the alarm set value L L , L 2 , L 3 .

The above operations are summarized in the flowchart of FIG.

Note that the alarm setting value can be set in three or more ways: when the rotating equipment 2 is started, when it is rotating steadily, and when it is decelerating and stopping. For example, one alarm setting value may be a vibration value within the normal allowable range when accelerating the rotating equipment 2 from a predetermined speed to a predetermined speed, and a vibration value within the normal allowable range when decelerating from a predetermined speed to a predetermined speed. It is possible to set the vibration value as one alarm setting value and to issue an alarm when these alarm setting values are exceeded.

[Effects of the Invention] As explained above, the diagnostic system for rotating equipment of the present invention can be used to diagnose rotating equipment when it is in steady rotation, during an acceleration period, and during a deceleration period. By predetermining the alarm setting value according to the driving situation,
The system compares the alarm set values with the actual vibration measurement values according to the operating conditions of the rotating equipment, and issues an alarm when the vibration measurement values exceed the alarm set values.
It is possible to monitor vibrations during the entire period from startup to shutdown of rotating equipment and take appropriate measures.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of alarm setting values in the embodiment, and FIG. 3(a)
(b) (c) (d) is an explanatory diagram of an example of vibration waveform analysis, FIG. 4 is an explanatory diagram of an example of frequency analysis of vibration waveform, and FIG. 5 is a flowchart for explaining the operation of the same example. . FIG. 6 is a block diagram of a conventional example, and FIG. 7 is an explanatory diagram of alarm setting values on the same side. 1...Motor, 2...Rotating system equipment,
3...Vibration pickup, 4...Channel switching unit, 5...
・Vibration analysis device, 21...First alarm device, 22...Second alarm device, 23...Third alarm device, 24...・Selection switch, 25...Switching device (alarm setting switching device), L
l, L2, L3... Alarm set value. Applicant Ishikawajima Harima Heavy Industries Co., Ltd. Examination No. 3rIA No. 4rs to 71 72 Yamizuke Interpretation Figure 5

Claims (1)

[Scope of Claim] A vibration analysis device that analyzes vibrations of rotating equipment and outputs vibration measurement values; , a first alarm device that issues an alarm when the vibration measurement value exceeds the alarm setting value, and a vibration measurement device that compares the vibration measurement value of the rotating equipment with the alarm setting value during a predetermined acceleration period. A second alarm device that issues an alarm when the vibration value exceeds the alarm set value compares the vibration measurement value of the rotating equipment with the alarm set value during a predetermined deceleration period, and the vibration measurement value is activated as an alarm. A third alarm device that issues an alarm when the set value is exceeded, and a vibration measurement value that determines the fundamental wave of the vibration frequency corresponding to the rotation speed of the rotating equipment, and when the fundamental wave is the frequency during steady rotation. is input to the first alarm device, and when the frequency of the fundamental wave is smaller than the fundamental wave frequency during steady rotation and increases in time series, the vibration measurement value is input to the second alarm device, and the vibration measurement value is input to the second alarm device. Rotating system equipment characterized in that it is equipped with an alarm setting switching device that inputs a vibration measurement value to a third alarm device when the frequency is smaller than the fundamental frequency during steady rotation and decreases in time series. diagnostic system.