JPS61253438A - Field balance corrector - Google Patents

Abstract

PURPOSE:To elevate the working efficiency with a reduction in the burden on operators, by arranging a field balance corrector made up of a rotation- detecting means, a vibration detecting means, a synchronous component extraction means and a drive-controlling means to automate the revolution control of a rotor. CONSTITUTION:This field balance corrector 100 is made up of a rotation detecting means comprising a rotation pickup 4 which detect the revolutions of a rotor 3 and the vibration phase reference point, a counter 28 and the like, a vibration detecting means comprising vibration pickups 5a and 5b which detects vibration generated in a support means S with the rotation of the rotor 3, a bandpass filter 34 and the like, a synchronous component extraction means which extracts vibration component synchronizing the revolutions based on the outputs of the rotation detecting means and the vibration detecting means and outputs a data and a drive controlling means comprising a microcomputer 26 or the like. Thus, the rotor 3 can reach the set revolutions automatically in sequence to obtain a desired data, thereby reducing the burden on operators.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of a field balance correction device used to calculate the unbalance of a rotating body using an influence coefficient method.

(Prior Art and its Problems) A device based on the influence coefficient method is known as a field balance correction device for a device including a high-speed rotating body, such as a turbine or a compressor. This device is described, for example, in Mitsui Engineering & Shipbuilding Technical Report Vol. 115, pages 2 et seq. (July 1982), and assumes that the relationship between the amount of unbalance of the rotating body and bearing vibration is linear. The aim is to determine the amount of balance correction required to eliminate imbalance by experimentally determining coefficients (influence coefficients) that express linear relationships.

FIG. 8 is a schematic diagram of a conventional field balance correction device used when performing balance correction using such an influence coefficient method. In the figure, this field balance correction device 1 includes a manually operated inverter 2, and an output from this inverter 2 is given to a drive source M such as an induction motor. This drive source M is built into the support means S of the rotating body 3. A rotating body 3 as a system to be measured and corrected is directly connected to this driving source M, and this rotating body 3 is configured to rotate at a desired rotational speed by the driving force of the driving source M.

The rotary body 3 is provided with a rotary pickup 4, and the rotation is detected by the rotary pickup 4, and a rotation signal N as a pulse signal synchronized with the rotation is generated.
becomes. Further, the vibration generated in the support means S by the rotation is detected by two sets of vibration pickups 5a and 5b attached to the support means S, and each vibration signal B
, B2. Of these, the rotation signal N- is input to a rotation speed calculator 7 and a vibration vector calculator 8 included in the calculation system 6. On the other hand, the vibration signals B1 and B2 are channel-switched and input to the vibration vector calculator 8. The rotation speed calculator 7 generates a rotation speed signal X representing the rotation speed of the rotating body 3 based on the rotation signal N, and this signal becomes the X input of the XY recorder 9. Further, the vector calculator 8 extracts the vibration amplitude and vibration phase synchronized with the rotation of the rotating body 3 from the vibration signals B1 and B2 based on the rotation signal Np, and extracts the vibration amplitude and vibration phase synchronized with the rotation of the rotating body 3, and generates the amplitude signal Y1 and the phase signal Y.
2 and outputs them to the Y input of the XY recorder 9. This synchronous component extraction operation is well known and will not be described in detail here, but basically takes the form of extracting a Fourier component corresponding to the rotational speed of the rotating body 3. Further, calculation 11110 is for calculating a field balance correction layer based on the read value of the XY recorder.

In the field balance correction system 1 having such a configuration, first, by manually setting the output of the inverter 2 as appropriate, the rotation speed of the rotating body 3 is stabilized at various values, and the rotation speed at each rotation speed is adjusted. The relationship between the vibration amplitude and the vibration phase is displayed on the X-Y recorder 9 and visually read. After that, the rotation of the rotating body 3 is stopped, and a weight of a known weight (hereinafter referred to as a "trial""Weight," he says.

) is added, and the rotating body 3 is rotated again to display the vibration state. Then, based on these data, an influence coefficient is determined by calculating the influence on vibration caused by the addition of the trial weight using the calculator 10,
We are looking for the necessary amount of balance correction.

However, balance correction using the influence coefficient method is based on the premise of obtaining vibration data without and with the trial weight added at each rotation speed. must be manually controlled to precisely match the rotational speeds before and after adding the trial weight. In addition, the number of rotational speed points at which vibration should be suppressed is N, and the number of correction surfaces is P. Then, for each point, it is necessary to set the number of rotations a total of (Po+1) times when no trial weight is added and when a trial weight is added to each of the P n correction surfaces, so the total rotation is Number setting number of times N "ha・N = (P +1)・N ... (1) r
It becomes n n. Therefore, for each of these N2 times, it is necessary to perform speed increase, rotation speed stabilization, and deceleration while precisely matching the rotation speed as described above, which places a considerable burden on the operator. In particular, when the structure becomes a complex device, in order to suppress the vibration □ amplitude of the rotating body below the standard value, it is necessary to increase the number of modified surfaces P0, and accordingly Nr
Since the value also becomes large, the burden on the operator becomes extremely heavy. For this reason, there is a problem in that the working efficiency of field balance correction decreases.

Furthermore, since such complicated control must be performed manually, there is also the drawback that the accuracy of correction depends on the skill level of the operator.

(Objective of the Invention) This invention is intended to overcome the above-mentioned problems, and aims to reduce the burden on the operator, increase work efficiency, and ensure high correction accuracy regardless of the skill level of the operator. The purpose of the present invention is to provide a field balance correction device that can perform the following functions.

(Means for Achieving the Object) In order to achieve the above-mentioned object, in the present invention, the rotating body of an apparatus having a rotating body and a means for supporting the rotating body is rotated by a drive source, and the rotating body supporting means is rotated by a drive source. In a field balance correction device that detects vibrations occurring in the means and obtains data for correcting the unbalance of the rotating body based on the influence coefficient method, rotation detection detects the rotational speed and vibration phase reference point of the rotating body. vibration detection means for detecting vibrations generated in the rotation body support means due to rotation of the rotation body; synchronous component extraction means for extracting vibration components and outputting data according to the extraction results; and drive control means for controlling the drive source to cause the rotational speed of the rotating body to reach a preset rotational speed. has been established.

Preferably, the field balance correction device is provided with means for monitoring the rotational state of the rotary body, the vibration state of the rotary body support means, and the driving state of the drive source, and the drive control means is provided with a means for monitoring the rotational state of the rotary body, the vibration state of the rotary body support means, and the driving state of the drive source. Means is included for emergency stopping the drive source in response to the monitoring output of the means.

(Embodiment) FIG. 2 is an external view of the main body of a field balance correction device which is an embodiment of the present invention. The main body of this device is
It has a built-in microcomputer, etc., which will be described later, and has a CRT 21 on its front and a printer 22 placed on its top. In addition, a keyboard 23 for inputting various data such as the number of revolutions is provided so that it can be pulled down in six directions of arrows, and when in use, it is pulled forward using a pivot shaft 24 as a fulcrum, as shown in Figure 3. It is folded down, and when not in use, it is pushed up and stored inside the main body as shown in Figure 2. In addition, as shown in Fig. 3, the keyboard 2
At the back of 3 is a floppy disk drive unit @25. Therefore, the dustproof effect of the keyboard 23 and floppy disk drive device 25 is ensured when not in use.

FIG. 1 is a block diagram showing the electrical configuration of this embodiment. In the figure, the rotating body 3 of the device to be subjected to field balance correction, the drive source M built in the support means S for driving this rotating body 3, etc. are the same as those shown in FIG. Since these devices are the same as those shown in FIG. On the other hand, this field balance correction device 100 includes a microcomputer (personal computer) 26 having a function as a main part of a drive control means, which is a characteristic configuration of the present invention. CRT21
．． Printer 22. A keyboard 23 and a floppy disk drive device 25 are connected. The microcomputer 26 is also connected via a bus 27 to a counter 28° A/D converter 29 . D/A converter 3
0 and a parallel input/output port 31 are connected.

Of these, an inverter 32 for supplying drive power to the drive source M and the like are connected to the parallel input/output board 31. In addition, similar to the device shown in FIG. 8, a rotating pickup 4, a vibration pickup 5a,
5b/fi is provided.

The rotation signal NP obtained from the rotation pickup 4 and the inverter frequency signal If obtained from the inverter 32 are provided to the counter 28 . This counter 28 calculates the rotation speed of the rotating body 3 from the pulse period of the rotation signal Np, and also calculates the rotation speed of the inverter 3 from the pulse period of the inverter frequency signal I.
This is to find the frequency of 2. The rotational signal N obtained from the rotational pickup 4 is also provided to the microcomputer 26 via the parallel input/output board 31 in order to obtain a vibration phase reference point.

On the other hand, the vibration signal B from the vibration pickups 5a and 5b
, B2 are provided to the channel switch 33. This channel switcher 33 alternately switches and selects the vibration signals B and 82 according to a switching signal given from the microcomputer 26 via the parallel input/output board 31,
It is output to the bandpass filter 34 as a signal B. This bandpass filter 34 receives a bandpass filter center frequency command signal fc from the microcomputer 26 via the D/A converter 30, and performs bandpass filtering of the signal B in a frequency region centered on the frequency specified by this signal. It is for carrying out. Then, the output signal B of this bandpass filter 34. is A/D converter 2
9 and then provided to the microcomputer 26. The remaining detailed configuration will be explained in detail in the operation description below.

Therefore, the operation of this embodiment will be explained below with reference to the flowchart shown in FIG.

First, before entering the routine shown in FIG. 4, first, the rotational speeds N, N, N3, etc. at which the balance is to be corrected. ....

Nn is determined and the data indicating the number of revolutions is inputted using the keyboard 23 in FIG. I'll keep it. This number of rotations, ie, the set number of rotations, can be set arbitrarily. At the same time, the rotational speed N8 of the rotating body 3 at the time of startup
, synchronous pull-in time T8, acceleration gradient ΔN/Δt1, and
As monitoring data, rotation speed upper limit value N 1 ax Inverter current upper limit value ■ Vibration amplitude upper limit value A + 1a1
Also input 18X゜8 and store it in the same way.

After such data input, the routine shown in FIG. 4 is entered. First, in step S1, the D/A converter 3
0 to the inverter 32 and the bandpass filter center frequency command signal f. Set initial values for etc.

After setting the initial value, in the next step S2, it is repeatedly determined whether or not a driving command signal is given from the keyboard 23, and when the driving command signal is given, the process proceeds to the next step S3. In step S3, the inverter operation signal d applied from the microcomputer 26 to the inverter 32 via the parallel input/output board 31 is turned on.

Then, in the next step S4, by increasing the inverter frequency command voltage f given to the inverter 32, the inverter output f has a frequency proportional to this voltage V. This inverter output generates ■. The driving source M
The speed of the rotating body 3 is increased. Although not shown, in this step, control such as activation and synchronization of the drive source M is also performed.

The following steps 85 to S8 correspond to a process of reading various data. Among these, in step S5, the counter 28 reads the number of rotations of the rotary body 3 based on the rotation signal N from the rotary pickup 4. Furthermore, in the next step S6, the inverter frequency signal If is read.

Step S7 is a step for reading and calculating vibration data, the details of which are shown as a subroutine in FIG. In FIG. 5, first, in step 821, based on the rotation signal N, which is also directly input to the microcomputer 26 through the parallel input/output board 31, it is determined whether or not the rotation pulse included in this rotation signal N has been input. It is determined whether or not the rotation pulse is input, and the process advances to step 822. This step 822 waits for the sampling timer (not shown) to go up, and when it goes up, the process proceeds to the next step 823, where the vibration signal B is output. Perform waveform sampling once from . Next step S2
In step 4, the sampling timer is cleared. Then, in step 825, it is determined whether all the data has been taken, and if data to be sampled remains, the process returns to step 822 and similar waveform sampling is continued.

The sampling operation repeated in this manner is shown in FIG. 6 as a timing chart. As shown in the figure, this sampling is performed using the time I until the sampling timer goes up as a sampling period.

The number of samplings within one rotation period (pulse interval) of the rotating body 3 is, for example, about 10 times. Further, since the signals B1 and B2 are alternately switched, this sampling can be performed for both signals B and B2.

When all the data have been collected, the process moves from step 825 to step S26, where synchronization is performed with the rotation of the rotating body 3 based on the vibration data taken in the above step and the rotation speed data taken in step S5 of FIG. The obtained vibration amplitude and vibration phase are calculated by multiplication.

This calculation calculates the angular velocity corresponding to the rotational speed of the rotating body 3 by ω,
The time sequence of the above sampling is t = (i = 1.2...
), and each vibration value obtained by the above sampling is f(t,), then the following product: f(t-)sin(
ωt, ) −(2)f(t・) cos(
ω1. ) ...By integrating each of (3) over one rotation period, the real part Re and imaginary part Im of the complex vibration vector are obtained, and the vibration amplitude is determined by U, and the vibration amplitude is determined by jan(Im/Re). This is done by calculating the respective phases. When such a synchronization component extraction operation is completed, the process returns to the main routine shown in FIG. 4. In addition, in this example, the vibration waveform f
By incorporating (t, ), waveform observation and frequency analysis can also be performed.

In the next step S8 in FIG. 4, the inverter output I in FIG. From the current transformer 36 provided for
Inverter current signal 1 representing the magnitude of inverter current
．． Read it. Thereafter, in step $9, the bandpass filter center frequency fc corresponding to the rotational speed is determined and the value is set. In other words, when performing bandpass filtering of the signal B by the bandpass filter 34, only frequency components near the frequency corresponding to the rotational speed of the rotating body are passed, but in this device, the data at each set rotational speed are In order to perform reading under one operation sequence, it is necessary to sequentially give filtering characteristics according to each set rotation speed, and for this purpose, this step S9
This means that the operations and sets are performed in .

In the next step S10, the rotation speed, vibration amplitude, vibration phase, inverter frequency, and inverter current read or calculated in each of the above steps are
Display on RT21. Then, the process moves to step $11, where it is determined whether the current rotational speed has reached the first one (N1) of the pre-stored set rotational speeds, and if it has not reached it, the process moves to step S3. , and continues increasing the speed of the rotating body and reading and displaying various data while keeping the inverter operation signal I in the ON state.

If it is determined in step 511 that the rotational speed of the rotating body 3 has reached the initial set rotational speed N1, the process proceeds to step 812, in which the inverter frequency command voltage V is maintained at a constant value, thereby increasing the rotational speed of the rotating body 3. Pause the acceleration of
The rotation speed is maintained at the set rotation speed N1. Then, in step 813, the vibration amplitude and vibration phase read at that time are stored in the memory in the microcomputer 26.

In step 814, it is determined whether vibration data for all preset frequencies have been stored, and if not, the process returns to step S3, where the speed is roughly increased and the remaining set rotational speed is N2.・・・
・Repeat each step above for No.

FIG. 7 shows changes in the rotational speed of the rotating body 3 due to such an operation. As shown in the figure, the rotating body 3 started at time 1=0 increases its speed as time t elapses, and the synchronization pull-in time T
At S, it is pulled into the pulling rotation speed N, and then,
By increasing the speed at a preset acceleration gradient ΔN/Δt,
The first set rotation speed N1 is reached. At the set rotation speed,
Although the speed increase is temporarily stopped for the purpose of stabilizing the rotation speed, it is not necessary to temporarily stop the speed increase when the speed increase gradient ΔN/Δt is not very large.

When the vibration data acquisition at the rotation speed N1 is completed, the speed increases again and reaches the next set rotation speed N2.

Hereafter, the last set rotation speed N is set in the same manner. When the inverter operation signal I is reached, the process moves to step S15 in FIG.
, and by resetting the inverter frequency command voltage Vf, the rotation of the rotating body 3 is stopped. This stopping action is also shown in FIG. In this way, the rotating body 3 automatically reaches each set rotation speed one after another, and desired data can be obtained.

Next, a trial weight is added to the correction surface P1, and the same operation as described above is performed. Also here, since the rotational speed of the rotating body 3 automatically reaches each set rotational speed, the rotational speed at which measurement is performed will match with high precision before and after adding the trial weight. The same applies to the other correction plane P2 in FIG. Using the data obtained in this way, the field balance correction amount is calculated based on the influence coefficient method, but the data obtained here may be passed as is to a calculation program for the field balance correction amount, or, It may be saved on a floppy disk or made into a hard copy using the printer 22.

By the way, in this embodiment, not only the rotation speed control is automated, but also the monitoring function of the device is automated. That is, when the inverter trouble signal It is input to the microcomputer 26 from the inverter 32 in FIG. In addition, if the rotation speed and vibration amplitude of the rotating body 3 exceed the upper limit values N and Al1ax, an interrupt is generated in the routine shown in FIG. 4 in the microcomputer 26, and the inverter operation signal Id By processing such as turning off the drive source M, the rotation of the rotating body 3 is brought to an emergency stop.

Further, this emergency stop is also performed by pressing the emergency stop switch 35 shown in FIG. Therefore, the operator
In addition to speed control, the burden of monitoring work will also be reduced.

In the embodiment described above, the speed of the rotary bodies 3 is increased in order from the lowest set rotation speed, and although this process is more efficient, the present invention is not limited to this. Furthermore, it is not essential that the set rotational speed be discrete; if you want as much data as possible about the rotational speed that belongs to a predetermined range, you can store the data each time it is read. You can leave it as is.

Further, as described above, the data may be read without pausing by increasing the speed continuously, and the processing after the corrected data has been taken is not particularly limited.

The set rotational speed, that is, the rotational speed at which vibration should be suppressed, is the rotational speed of the rotating body 3.
It may be determined experimentally by increasing the speed of the rotating body 3 without adding trial weights to the correction planes P and P2, and visually observing the vibration state, etc.

Further, in the above embodiment, the drive source M and the rotating body 3 are directly connected, but a mechanical continuously variable transmission or the like may be used. Furthermore, the present invention is not limited to a microcomputer, and can also be realized by a hardware configuration.

(Effects of the Invention) As explained above, in this invention, since the rotation speed control of the rotating body is automated, it is possible to obtain a field balance correction device for a rotating body that reduces the burden on the operator and improves work efficiency. can.

Therefore, it is also possible for one operator to operate the devices of a plurality of people. Further, since no skill is required to control the rotation speed, correction accuracy is also improved.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the electrical configuration of an embodiment of the present invention, Figs. 2 and 3 are external views showing the appearance of the main body in the embodiment, and Figs. 4 and 5 show the operation of the embodiment. 6 is a timing chart for explaining waveform sampling, FIG. 7 is a graph showing changes in the rotational speed of a rotating body, and FIG. 8 is a block diagram showing a conventional field balance correction device. 3...Rotating body 4...Rotating pickup 5
a, 5b... Vibration pickup M... Drive source 26... Microcomputer 32... Inverter 100... Field balance correction device P1. P2・
・Correction aspect

Claims (2)

[Claims] (1) The rotating body of a device having a rotating body and means for supporting the rotating body is rotated by a drive source, vibrations occurring in the rotating body supporting means are detected, and the rotating body is determined based on the influence coefficient method. A field balance correction device that obtains data for correcting an unbalance amount of the rotating body, the device comprising: rotation detecting means for detecting the rotational speed and vibration phase reference point of the rotating body; a vibration detection means for detecting the generated vibration; and a vibration component synchronized with the rotation of the vibration based on outputs of the rotation detection means and the vibration detection means, and outputting data according to the extraction result. A field balance correction device comprising: a synchronous component extracting means for extracting a synchronous component; and a drive control means for controlling the drive source to cause the rotational speed of the rotating body to reach a preset rotational speed. (2) The field balance correction device is provided with means for monitoring the rotational state of the rotary body, the vibration state of the rotary body support means, and the driving state of the drive source, and the drive control means: 2. The field balance correction device according to claim 1, further comprising means for urgently stopping said drive source in response to a monitoring output of said monitoring means.