JPH0735982B2 - Portable balancing device - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a device for accurately determining the amount and position of imbalance (hereinafter referred to as imbalance) occurring in a rotating body of a rotary machine.

[Prior art]

When rotating bodies are combined and integrated on-site like a turbine generator or an electric motor, the residual amount of each unbalance is allowed on-site even if the unbalance is adjusted individually at the factory production. There is a case that the value is exceeded and vibration due to imbalance occurs. In addition, the center of rotation at the time of coupling may be offset by an assembly error, causing an apparent imbalance and increasing vibration. These imbalances will be corrected by local field balancing work. Further, in a machine that has been operated for many years, the imbalance may increase due to the secular change of the rotating body, and the vibration may increase. Further, in the case of the generator rotor, since the coil is inserted in the slot cut in the axial direction, heat is generated when an exciting current flows through the coil. This heat is cooled with air or hydrogen, but if this cooling effect is non-uniform due to differences in flow path resistance, etc., a temperature distribution will occur in the rotor, causing bending,
If there is a difference in resistance at the time of thermal expansion between the wedge and the insulator for preventing the coil from popping out by centrifugal force, the rotor may bend and vibration may increase. When the vibration increases in this way, the unbalance of the rotating body is again corrected by the field balancing work. This field balancing is performed by the following procedure. (1) The amplitude of vibration that matches the rotation speed and the vibration phase from a reference position provided in advance on the rotating body are measured. (2) Next, a trial weight is attached to the unbalance correction surface defined on the rotating body, and the same measurement as in (1) is performed. (3) The size and position of the unbalance of the rotating body are calculated from the vibration vectors of (1) and (2), the size of the trial weight, and the mounting angle. In addition, when the above-mentioned unbalanced vibration due to heat occurs, consider the unbalanced component due to thermal bending of the rotor so that the vibration level satisfies the allowable value under the operating load of the power plant to ensure the safety of the machine. Field balance is performed. The above describes the correction by one side, but if the unbalance cannot be determined by only the one side correction, the correction using the two sides is performed. The calculation for determining these imbalances (hereinafter referred to as balance calculation) is performed by a specialized engineer for vector calculation. In addition, a dedicated balancer equipped with an analysis of the rotational speed component of vibration and a balance calculation circuit is also used.

[Problems to be Solved by the Invention]

However, these balancers have the following drawbacks. (1) Conventionally, only one type of test rotation speed can determine the imbalance. For this reason, field balancing cannot be performed accurately and quickly in a rotary machine in which the rotational speed of the machine is wide, such as an inverter electric motor, an industrial drive turbine, or a machine tool whose rotational speed is changed depending on the material. (2) Determining the unbalance that satisfies the two test speeds requires a professional engineer, and is for multi-speed, multi-bearing developed for balancing long-axis turbine rotors and rotors for jet engines. Balance calculation formulas include a least squares method and a modal method, but these calculations require a computer such as a personal computer or a minicomputer and a specialized technician for the operation, which increases the cost. In addition, conventional balancing devices are intended to reduce vibration levels at critical speeds present within the rated speed of the machine, which are important in ensuring machine safety, but are It is a transient one that only causes problems when stopped. For example, there are machines such as turbine generators where vibration during operation is extremely important when considering safety, but the current situation is that experienced experts perform field balancing work during load operation. . The present invention provides a portable balancing device capable of easily specifying a corrected weight from an S / V curve by arbitrarily designating two kinds of rotation speeds in order to adjust an imbalance occurring in a rotating body of a rotating machine. To aim. Further, according to the present invention, by designating an arbitrary two kinds of rotation speed and a machine operation load from a graph of S / V curve and vibration level obtained when the machine is accelerated or decelerated, the specified rotation speed and designation It is an object of the present invention to provide a portable balancing device that can determine a correction weight that reduces vibration under a given load. Further, according to the present invention, in order to adjust the imbalance generated in the rotating body of the rotating machine, two kinds of rotation speeds are arbitrarily designated,
An object of the present invention is to provide a portable balancing device in which the corrected weight can be easily determined from the S / V curve and the vibration state after the balance can be grasped in advance in all rotation speed regions before the operation for confirmation is performed. .

[Means for Solving the Problems]

According to the apparatus of claim 1, the above object is to provide two vibration detectors, which are installed in the bearing of the rotating machine and convert the vibration generated by the rotating body into an electric signal, and an output signal from the vibration detector, which has an optimum signal level. An amplifier circuit that amplifies up to and an analog electric signal from this amplifier circuit is converted into a digital electric signal
An A / D conversion circuit, a rotation pulse detector that outputs a reference position previously provided on the rotating body as an electric signal in order to synchronize the A / D conversion sampling and the sampling start with the rotation of the rotating body, and The sampling interval of the A / D conversion circuit is based on one rotation of the rotating body, and the multiplication circuit that outputs a rotation order signal is performed in order to perform the order multiple, and the digital electric signal of the A / D conversion circuit is analyzed in order to rotate. Fast Fourier Transform (hereinafter referred to as FFT) processor that outputs the phase of the signal based on the level of the signal synchronized with the rotation pulse and the rotation pulse, and the primary basic component corresponding to the rotation speed in the data analyzed by this FFT processor S / V circuit that extracts only the number of revolutions and its vibration level and controls the operation start of the A / D conversion circuit from the basic pulse signal of the rotation pulse detector, and the primary basic from the S / V circuit Portable balancing device including a balance calculation circuit for calculating an unbalance amount of the rotating body and an unbalanced position of the rotating body from a reference position using minute data, and a display circuit for displaying a calculation result of the balance calculation circuit. Is achieved by According to the apparatus of claim 2, the above object is to provide two vibration detectors, which are installed in the bearing of the rotating machine and convert the vibrations generated by the rotating body into electric signals, and an output signal from the vibration detectors, which has an optimum signal level. An amplifier circuit that amplifies up to and an analog electric signal from this amplifier circuit is converted into a digital electric signal
An A / D conversion circuit, a rotation pulse detector that outputs a reference position previously provided on the rotating body as an electric signal in order to synchronize the A / D conversion sampling and the sampling start with the rotation of the rotating body, and The sampling interval of the A / D conversion circuit is based on one rotation of the rotating body, and the multiplication circuit that outputs a rotation order signal is performed in order to perform the order multiple, and the digital electric signal of the A / D conversion circuit is analyzed in order to rotate. The fast Fourier transform processor that outputs the signal phase synchronized with the signal and the phase of the signal based on the rotation pulse, and only the first-order basic component corresponding to the rotation speed is extracted from the data analyzed by this fast Fourier transform processor. S / V circuit that graphs the rotation speed and its vibration level, a load detection circuit that detects a load such as a turbine generator, and a basic pulse signal of the rotation pulse detector and Serial to control the start of operation of the A / D conversion circuit from the detected load signal at the load detection circuit,
A balance calculation circuit for calculating an unbalance amount of the rotating body and an unbalanced position from the reference position of the rotating body using the data of the primary basic component from the S / V, and the calculation result of the balance calculation circuit are displayed. This is achieved by a portable balancing device consisting of a display circuit. According to the apparatus of claim 3, the above object is to provide two vibration detectors, which are installed in the bearing of the rotating machine and convert the vibration generated by the rotating body into an electric signal, and an output signal from the vibration detector, which has an optimum signal level. An amplifier circuit that amplifies up to and an analog electric signal from this amplifier circuit is converted into a digital electric signal
An A / D conversion circuit, a rotation pulse detector that outputs a reference position previously provided on the rotating body as an electric signal in order to synchronize the A / D conversion sampling and the sampling start with the rotation of the rotating body, and The sampling interval of the A / D conversion circuit is based on one rotation of the rotating body, and the multiplication circuit that outputs a rotation order signal is performed in order to perform the order multiple, and the digital electric signal of the A / D conversion circuit is analyzed in order to rotate. The fast Fourier transform processor that outputs the signal phase synchronized with the signal and the phase of the signal based on the rotation pulse, and only the first-order basic component corresponding to the rotation speed is extracted from the data analyzed by this fast Fourier transform processor. The S / V circuit that graphs the rotation speed and its vibration level, and the operation of the A / D conversion circuit is controlled by the basic pulse signal of the rotation pulse detector to control the primary basic component from the S / V circuit. Balance calculation circuit for calculating the unbalanced amount of the rotating body and the unbalanced position from the reference position of the rotating body using the data of, and, for each vibration measurement point, the rotating body for the entire rotation speed region of the rotating machine. And a display circuit for displaying the calculation result of the balance calculation circuit or the vibration prediction calculation circuit for storing the calculation of the amplitude, phase, and rotation speed of the primary basic component to calculate the balance state of It is composed of the following, and points out any two rotation speeds from the rotation speed and vibration level graph created by the S / V circuit, calculates the unbalance amount and position to reduce each vibration, and The balance is achieved by a portable balancing device in which the total speed is displayed.

[Action]

According to the apparatus of claim 1 of the present invention, since the S / V curve is displayed on the display circuit, the operator indicates two kinds of rotation speeds while watching the S / V curve data, so The data is automatically taken into the balance calculation circuit, the amount and position of the unbalance of the rotating body are calculated from these data, and the result is displayed on the display circuit. For this reason, balancing work can be performed quickly, and since the number of rotations can be selected in the optimum test while looking at the S / V curve, the imbalance can be accurately corrected even if the machine used is in a wide range. Further, according to the apparatus of claim 2 of the present invention, when the vibration data due to the unbalance factor generated during the operation of the rotating machine reaches a preset load, the load detection circuit automatically loads it into the balance calculation circuit. From these data, the amount and position of the imbalance in consideration of both the weight imbalance existing in the rotating body and the load imbalance generated during operation are calculated, and the result is displayed on the display circuit. For this reason, balancing work can be performed quickly, the number of revolutions to be balanced can be selected while looking at the S / V curve, and there is a possibility that unbalance will occur during operation as represented by a turbine generator. High rotating machine balancing can be performed efficiently and without skill. Further, according to the apparatus of claim 3 of the present invention, since the S / V curve is displayed on the display circuit, the operator designates two kinds of rotation speed while observing the S / V curve data, and thereby the specified rotation speed is obtained. It is automatically taken into the balance calculation circuit while watching the number data, the amount and position of the unbalance of the rotating body is calculated from these data, the result is displayed on the display circuit, and the rotating machine is operated. The vibration state after balance adjustment for all rotation regions is displayed in advance before actually performing balance adjustment. Therefore, since the validity of the balance calculation can be confirmed in advance, the time and labor required for the readjustment of the balance weight attachment, which was taken from several hours to half a day in the turbine generator, and the operation of the machine for confirming the balance are unnecessary. Therefore, the balancing work can be performed quickly, and the S / V curve can select the rotation speed in the optimum test, so that the thin balance can be accurately corrected even when the machine used is in a wide range.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. First
The figure shows a portable balancer according to the first embodiment of the present invention.
Fig. 2 is a systematic diagram of the operating device, and Fig. 2 is the portable balun in Fig. 1.
Of initial test and S / V in display circuit of display device
Figure showing the curve, Figure 3 is the portable balancing device of Figure 1.
Instruction and S / V curve for display test circuit
FIG. 4 shows the portable balancing device of FIG.
It is a figure which shows the balance calculation result in a display circuit. Vibration detector 1's A and 1 B are mounted on the bearing of the rotating machine and rotated.
The vibration generated from the rolling elements is detected as an electric signal. Bearing
Vibration detection direction generates vibration due to unbalance of rotating body
It is easy to do in the radial direction, and in the horizontal axis machine, in the horizontal direction and the vertical direction
is there. However, both A and 1B of vibration detector 1 are in the detection direction.
To be the same. As a vibration sensor for vibration detector 1,
There are speed type, speed type, displacement type, etc.
A speed type sensor that responds up to a frequency of about 500 Hz
Generally used. The amplification circuit 2 is provided from the vibration detector 1.
Optimal level of the signal inputting the output signal to the A / D conversion circuit 3
Amplify up to. In addition, the amplifier circuit 2 is an electric signal proportional to the speed.
The signal is integrated into an electric signal proportional to the displacement. Also amplification
Is the bell the A / D conversion circuit when the A / D conversion circuit 3 is over?
These signals automatically adjust to the optimum level. A / D change
Amplifier circuit whose input level of the conversion circuit 3 is set at this time
If less than 30% of the 2 range, it will automatically reach the optimum level
Adjusted. The optimized output signal of the amplification circuit 2 is output by the A / D conversion circuit 3.
Converted to digital output signal. This A / D conversion circuit has 10
Use bit A / D converter. Also FFT processor
In order to perform order analysis in 4, the A / D converter circuit 3
The sampling is performed with a multiplied pulse based on the rotation pulse.
For this reason, the rotation reference
It is detected as a rotation pulse signal from the loose detector 6. this
A photoelectric pulse detection sensor is used for the rotation pulse detector 6.
And attach a reflective tape to the reference position of the rotating body.
Ku. The rotation reference position of the rotating body is the trial weight or the rotating body.
Assembling the rotating body to use it as a reference for the mounting position of the weight
Select an easy-to-understand position such as a reference or key groove. Rotation pulse detection
The pulse signal of the device 6 is generated once per revolution of the rotating body
Is synchronized with the rotation speed. This pulse signal is multiplied by the multiplication circuit 7
And the balance calculation circuit 8. In the multiplication circuit 7, the pulse cycle of one rotation interval is set to a fixed short cycle.
Divide into periods. This device divides into 64, but this 64
The sampling of A / D conversion is controlled at the doubled cycle. Obey
The A / D conversion circuit 3 converts the analog signal into 1/64 cycle of the rotation speed.
Sampling every time. That is, the data of the A / D converter
The number of data is 1024 points (10 bits) and is always 16 rotations.
Data is captured, which is always
It will be constant. By doing so, the time axis signal detected by the vibration detector 1
Is a digital signal whose rotation is the reference axis in the A / D conversion circuit 3.
To be converted. This digital signal is FFT processor 4
The order is analyzed. That is, the rotation speed of the target machine is
Then, the vibration spectrum of this integral multiple (called order) is analyzed.
To be done. This device analyzes up to the 6.25th order of rotation and
Phase of vibration based on each vibration level and rotation pulse
Are seeking. In S / V circuit 5, the order is FFT processor 4
Only the first-order component is extracted from the analyzed spectrum and the amplitude and phase
Memorize the data of and make S / V curve. In this S / V curve, the horizontal axis is the rotation speed and the vertical axis is the respective rotation speed.
Is a vibration level equivalent to. Figure 2 shows an example of S / V curve 1
It represents data from 500 rpm to 3500 rpm. The operation of the S / V circuit 5 and the creation of the S / V curve will be described in detail.
And the pulse signal of the rotation pulse detector 6
The path 8 detects and instructs the A / D conversion circuit 3 to start sampling.
To show. The sampled data is the FFT processor
The order is analyzed in 4, and only the first-order component is analyzed in the S / V circuit 5.
Is entered. Next, the fact that the data was stored in the S / V curve
When the balance calculation circuit 8 is instructed by the / V circuit 5,
Sensor circuit 8 detects the next rotation pulse and detects the next data.
Is instructed to the A / D conversion circuit 3. This work
Is the rotation speed from the start of measurement to the rotation speed at the end of measurement
Up to automatically. In the example of Fig. 2, 1500 rpm to 350
It was measured up to 0 rpm. The S / V curve created here is a balun
Input to the calculation circuit 8 and simultaneously displayed on the display circuit 9.
It In this way to calculate the unbalance of the rotating body
Necessary vibrations are measured. Next, the calculation of the unbalance measurement is performed by the display circuit 9
The procedure of the balance calculation circuit 8 will be described using the display example of
It 1) Preparation for starting balancing The following conditions are input from the display circuit 9 of this device. Target machine rotation speed (minimum, maximum, rated speed)
Enter to determine the S / V curve creation speed range. Select the type of test rotation speed (one speed, two speeds).
In FIG. 2 (a), two speeds are displayed. Select the number of correction surfaces to correct the unbalance of the rotating body
Yes (one-corrected surface, two-corrected surface) Two-corrected in (a) of FIG.
The surface is displayed. 2) Initial test This test measures the vibration corresponding to the unbalance of the rotating body.
It is a fixed test. Figure 2 shows the initial test instructions and
Fig. 2 shows the display circuit that displays the S and V curves.
Use (a) to specify the cursor for the initial test, and (b)
(C) operates the rotating machine according to the specification and measures the S / V curve
It is an example. FIG. 2B shows the data measured by A of the vibration detector 1.
In Fig. 2 (C), B of the vibration detector 1 was measured.
It is a display showing data. Data is measured when the number of rotations increases
Determined from these S / V curves
Two types of rotation speed are specified with the cursor, and each data is
It is displayed in FIG. 2 (b) and FIG. 2 (c). data
Is the vector of the relevant vibration along with measurement points A and B, test speeds 1 and 2.
Is extracted from the S / V curve. In this data Curso
There are two types of rotation speeds, 2885.5 rpm and 3580.3 rpm, depending on the
It is fixed. 3) Trial test (1), (2) This test was selected in advance from the vibration data of the initial test.
Determine the magnitude and position of the imbalance on the correction surface
In order to attach the known trial weight to the correction surface,
It is a test to check the response. Figure 3 shows the second trial
Displaying exams. The first trial test is illustrated
Not done in the same way as the second. The trial weight attached to the correction surface 2 is the attachment position at 4g
The position is 90 ° in the opposite direction of rotation from the reference position of the rotating body.
It In the S / V curve of the test result, point A is (B), point B is
It is displayed in (c). Initialize from this S / V curve
The speed data closest to the two speeds specified in the test
Data is extracted. In this example, the 2882.0 rpm and 3590.3 rpm
The motion vector has been extracted. In addition, the vibration vectors and the test vectors of the trial tests (1) and (2)
The vibration vector of the initial test is compared by the balance calculation circuit 8.
If the difference is small, the balance calculation is calculated.
In order to increase the error, the comments of the retest are shown in Fig. 3.
Displayed in (b) and (c). In that case, Fig. 3
Increase the trial weight in (a) and re-acquire the data.
U 4) Determination of modified weight The modified surface weight is determined by the balance calculation circuit 8 in FIG.
2 types specified in advance using the data of 2) and 3) above
Of the correction surfaces 1 and 2 that satisfy the target vibration value at the rotation speed of
Calculate the size and position of the modified weight. The formula used for this operation uses the known least squares method.
The arithmetic expression of is stored in the balance arithmetic circuit 8. Fourth
(A) of the figure shows the result calculated by the balance calculation circuit 8.
This is an example displayed on the circuit 9. Achieved the target vibration value of 20 μm
Rotating with a correction weight of 2.3g required for correction surface 1 to do
Mounting position from the standard position of the body 128.22deg, correction surface 2
From the standard position of the rotating body 3.7g and the correction weight required for
The installation position 181.27deg is displayed. Also those
The expected vibration vector when the modified weight of
Rotation speed 1, rotation speed 2, operating point load for measurement points A and B
Is displayed. Also, this device displays three comments. When the correction weight is too large In this case, reduce the correction weight of the calculation result and instruct recalculation.
By doing so, the expected vibration vector is recalculated. Obey
Of course, the target vibration level cannot be cleared, but the vibration
It can be seen that can be reduced below the initial value. If the target vibration level is severe, consider the characteristics of the rotating body.
If a calculation result that satisfies the two speeds cannot be obtained. In this case, the target value is changed and recalculation is performed. The target value is severe if only one face is selected.
If you are not satisfied with the second speed. Increase the target value or set the number of correction surfaces to 2 and retest.
To do. 5) Confirmation test with the correction surface weight attached. Perform the confirmation test with the correction surface weight of the calculation result attached.
The results are shown in (b) and (c) of FIG. That is, the rotation speed
At point 2885.5 rpm, vibration at point A is 52.10 μm, and vibration at point B is
Since the movement is 30.00 μm, the initial value is A point 130.88 μm, B point 10
It was much smaller than 4.29 μm. This result is the initial
Data is stored in the test. If balancing is performed once, vibration can be reduced to the initial target value.
If not, please use the data from the trial tests in 2) and 3) above.
Recalculate with new initial data for verification test
You can In this device, by repeating the above 2) to 5)
Correct the unbalance of the rotating body. This device housed everything from the vibration detector to the display circuit.
It is portable. Another embodiment of the present invention will be described below. Figure 5 shows this
Of the portable balancing device according to the embodiment of claim 2
System diagram, Fig. 6 is a table of the portable balancing device in Fig. 5.
Shows the initial test instruction and S / V curve in the circuit shown
Fig. 7 and Fig. 7 show the display times of the portable balancing device of Fig. 5.
Diagram showing instruction and S / V curve of trial test on road
FIG. 8 shows the display circuit of the portable balancing device of FIG.
It is a figure which shows the balance calculation result in. In FIG. 5, A of the vibration detector 1 and B of 1 are rotary machines.
Mounted on the bearing of the
To detect. The direction of vibration detection of the bearing is the abalun of the rotor.
In the radial direction, the horizontal axis is the
It is the horizontal direction and the vertical direction. However, A of vibration detector 1, B of 1
Both make the detection direction the same. Vibration of vibration detector 1
There are acceleration type, velocity type, displacement type, etc.
High low frequency sensitivity and response up to a frequency of about 500Hz
Generally, a velocity sensor is used. The amplifier circuit 2 is
Input the output signal from the vibration detector 1 to the A / D conversion circuit 3.
Amplify the signal to the optimum level. In addition, the amplifier circuit 2 is fast
Electrical signal proportional to displacement by integrating electrical signal proportional to degree
To Also, the amplification level has exceeded the A / D conversion circuit 3.
In this case, the signal from the A / D conversion circuit automatically reaches the optimum level.
Adjusted to. The input level of A / D conversion circuit 3 is set at this time.
Maximum is 30% or less of the specified range of amplifier circuit 2
It is automatically adjusted to the appropriate level. The optimized output signal of the amplification circuit 2 is output by the A / D conversion circuit 3.
Converted to digital output signal. This A / D conversion circuit has 10
Use bit A / D converter. Also FFT processor
In order to perform order analysis in 4, the A / D converter circuit 3
The sampling is performed with a multiplied pulse based on the rotation pulse.
For this reason, the rotation reference
It is detected as a rotation pulse signal from the loose detector 6. this
A photoelectric pulse detection sensor is used for the rotation pulse detector 6.
And attach a reflective tape to the reference position of the rotating body.
Ku. The rotation reference position of the rotating body is the trial weight or the rotating body.
Assembling the rotating body to use it as a reference for the mounting position of the weight
Select a position that is easy to understand, such as the reference or key groove. Rotation pulse detection
The pulse signal of the device 6 is generated once per revolution of the rotating body
Is synchronized with the rotation speed. This pulse signal is multiplied by the multiplication circuit 7
And the balance calculation circuit 8. In the multiplication circuit 7, the pulse cycle of one rotation interval is set to a fixed short cycle.
Divide into periods. This device divides into 64, but this 64
The sampling of A / D conversion is controlled at the doubled cycle. Obey
The A / D conversion circuit 3 converts the analog signal into 1/64 cycle of the rotation speed.
Sampling every time. That is, the data of the A / D converter
The number of data is 1024 points (10 bits) and is always 16 rotations.
Data is captured, which is always
It will be constant. By doing so, the time axis signal detected by the vibration detector 1
Is a digital signal whose rotation is the reference axis in the A / D conversion circuit 3.
To be converted. This digital signal is FFT processor 4
The order is analyzed. That is, the rotation speed of the target machine is
Then, the vibration spectrum of this integral multiple (called order) is analyzed.
To be done. This device analyzes up to the 6.25th order of rotation and
Phase of vibration based on each vibration level and rotation pulse
Are seeking. In S / V circuit 5, the order is FFT processor 4
Only the first-order component is extracted from the analyzed spectrum and the amplitude and phase
Memorize the data of and make S / V curve. In this S / V curve, the horizontal axis is the rotation speed and the vertical axis is the respective rotation speed.
Is a vibration level equivalent to. Fig. 6 shows an example of S / V curve 1
It represents data from 500 rpm to 3500 rpm. The operation of the S / V circuit 5 and the creation of the S / V curve will be described in detail.
And the pulse signal of the rotation pulse detector 6
The path 8 detects and instructs the A / D conversion circuit 3 to start sampling.
To show. The sampled data is the FFT processor
The order is analyzed in 4, and only the first-order component is analyzed in the S / V circuit 5.
Is entered. Next, the fact that the data was stored in the S / V curve
When the balance calculation circuit 8 is instructed by the / V circuit 5,
Sensor circuit 8 detects the next rotation pulse and detects the next data.
Is instructed to the A / D conversion circuit 3. This work
Is the rotation speed from the start of measurement to the rotation speed at the end of measurement
Up to automatically. In the example of Fig. 6, 1500 rpm to 350
It was measured up to 0 rpm. The S / V curve created here is a balun
Input to the calculation circuit 8 and simultaneously displayed on the display circuit 9.
It The above is the balance meter in the process of changing the rotation speed.
I explained about the acquisition of vibration data necessary for calculation.
Has occurred since the rotating machine entered the rated speed.
Data for vibration changes caused by imbalance
Describe the collection. Generating power as vibration changes during operation in a rotating machine
Taking the machine rotor as an example, first, the machine speed is the rated speed.
Is reached, that is, when the load operation has not yet started.
The primary rotation speed component of the vibration data in
The value detected by the device 6 and the preset rated speed value
The balance calculation circuit 8 is automatically
Is read. Next, power generation is started and operational load is reached
And the value detected there by the load detection circuit 10 and preset
Automatically by comparing the operational load value
The primary rotation speed component of vibration is read into the balance calculation circuit 8.
Be done. In this way, it is necessary to calculate the balance of the rotating body.
The necessary vibration is measured. Next, the calculation of the unbalance measurement is performed by the display circuit 9
The procedure of the balance calculation circuit 8 will be described using the display example of
It 1) Preparation for the start of balancing Enter the following conditions from the display circuit 9 of this device. The number of revolutions of the target machine (minimum, maximum, rated revolutions)
Enter to determine the S / V curve creation speed range. Select the type of test rotation speed (one speed, two speeds)
In FIG. 6 (a), two speeds are displayed. Select the number of correction surfaces to correct the unbalance of the rotating body
Yes (one correction surface, two correction surfaces) Two corrections in (a) of FIG.
The surface is displayed. The operational load and the allowable vibration value under that load are set as numerical values.
And enter. 2) Initial test This test measures the vibration corresponding to the unbalance of the rotating body.
It is a fixed test. Figure 6 shows the initial test instructions and
Fig. 6 shows the display circuit displaying the S and V curves.
Use (a) to specify the cursor for the initial test, and (b)
(C) operates the rotating machine according to the specification and measures the S / V curve
Fig. 6 (b), which is an example of the above, shows the data measured by A of the vibration detector 1.
In Fig. 6 (c), B of the vibration detector 1 was measured.
It is a display showing data. Data is measured when the number of rotations increases
Determined from these S / V curves
Two types of rotation speed are specified with the cursor, and each data is
It is displayed in FIG. 6 (b) and FIG. 6 (c). data
Is the vector of the relevant vibration along with measurement points A and B, test speeds 1 and 2.
Is extracted from the S / V curve. In this data Curso
There are two types of rotation speeds, 2885.5 rpm and 3580.3 rpm, depending on the
It is fixed. In addition, the settings described in the balancing start preparations described above
When the maximum speed is reached, the vibration data at that time is automatically measured.
Measured. Table of vibration vectors measured in Fig. 6 (c)
An example is shown. And the operation of the machine is continued and the operational load is reached.
Then, the load detection circuit 10 causes the vibration
The cutout is taken into the balance calculation circuit 8. 3) Trial test (1), (2) This test was selected in advance from the vibration data of the initial test.
Determine the magnitude and position of the imbalance on the correction surface
In order to attach the known trial weight to the correction surface,
This is a test for examining the dynamic response. Figure 7 shows the second trial
1st trial test showing
Although not done, it was performed in the same manner as the second time. The trial weight attached to the correction surface 2 is the attachment position at 4g
The position is 90 ° in the opposite direction of rotation from the reference position of the rotating body.
It In the S / V curve of the test result, point A is (B), point B is
It is displayed in (c). Initialize from this S / V curve
The speed data closest to the two speeds specified in the test
Data is extracted. In this example, the 2882.0 rpm and 3590.3 rpm
The motion vector has been extracted. Furthermore, as with the initial test, the rated speed and operation
When the load is reached, the vibration vector is transferred to the balance calculation circuit 8.
It is captured. In addition, the vibration vectors and the test vectors of the trial tests (1) and (2)
The vibration vector of the initial test is compared by the balance calculation circuit 8.
If the difference is small, the balance calculation is calculated.
In order to increase the error, the retest comments are shown in Fig. 7.
Displayed in (b) and (c). In that case, Fig. 7
Increase the trial weight in (a) and re-acquire the data.
U 4) Determining the correction weight The correction surface weight is determined by the balance calculation circuit 8 in FIG.
2 types specified in advance using the data of 2) and 3) above
Vibration value at various rotation speeds and allowable load operation
Size and position of the correction weights of the correction surfaces 1 and 2 that satisfy the vibration value
Calculate the position. The formula used for this operation uses the known least squares method.
The arithmetic expression of is stored in the balance arithmetic circuit 8. 8th
(A) of the figure shows the result calculated by the balance calculation circuit 8.
Achieve the target vibration value of 20 μm, which is an example displayed on the circuit 9.
2.3g of correction weight and rotating body necessary for correction surface 1 in order to
Mounting position from the reference position of 128.22deg, on the correction surface 2
The required correction weight of 3.7 g and the rotation weight from the reference position
Attachment position 181.27deg is displayed. Also those
Rotation of expected vibration vector when a modified weight is attached
Table for measurement points A and B at speed 1, rotation speed 2 and operational load
It is shown. Also, three comments are displayed on this device. When the correction weight is too large In this case, the correction weight of the calculation result is reduced and recalculation is instructed.
By doing so, the expected vibration vector is recalculated. Obey
Of course, the target vibration level cannot be cleared, but the vibration
It can be seen that can be reduced below the initial value. Allowable vibration at the target vibration level or operational load
If the dynamic level is severe, the speed of the rotating body is two speeds.
And unbalance during load operation can be satisfied at the same time
When the calculation result cannot be obtained. In this case, in the actual field balance,
Recalculate so as to satisfy the load allowable value in degrees. The target value is severe if only one face is selected.
If the speed and load tolerance cannot be met. Increase the target value or set the number of correction surfaces to 2 and retest.
To do. 5) Confirmation test with the correction surface weight attached. Perform the confirmation test with the correction surface weight of the calculation result attached. The results are shown in (b) and (c) of FIG. That is, the rotation speed
At point 2885.5 rpm, vibration at point A is 52.10 μm, and vibration at point B is
Motion is 30.00 μm, vibration during load operation is A point 38.50 μm, B
Since the point is 35.01 μm, the initial value is A point 130.88 μm, B
Point 104.29μm, in load operation point A 73.12μm, point B 69.28
It was much smaller than μm. The results are stored as data in the initial test. If balancing is performed once, vibration can be reduced to the initial target value.
If not, please use the data from the trial tests in 2) and 3) above.
Recalculate with new initial data for verification test
You can In this device, by repeating the above 2) to 5)
Correct the unbalance of the rotating body. This device housed everything from the vibration detector to the display circuit.
It is portable. Another embodiment of the present invention will be described below. Figure 9 shows this
Of the portable balancing device according to the embodiment of claim 3
System diagram, Fig. 10 is a table of the portable balancing device in Fig. 9.
Shows the initial test instruction and S / V curve in the circuit shown
Fig. 11 and Fig. 11 are display times of the portable balancing device of Fig. 9.
Diagram showing instruction and S / V curve of trial test on road
FIG. 12 shows the display of the portable balancing device shown in FIG.
Result of balance calculation on road and vibration prediction after balance
It is a figure which shows a result. Vibration detector 1's A and 1 B are mounted on the bearing of the rotating machine and rotated.
The vibration generated from the rolling elements is detected as an electric signal. Bearing
Vibration detection direction generates vibration due to unbalance of rotating body
It is easy to do in the radial direction, and in the horizontal axis machine, in the horizontal direction and the vertical direction
is there. However, both A and 1B of vibration detector 1 are in the detection direction.
To be the same. As a vibration sensor for vibration detector 1,
There are speed type, speed type, displacement type, etc.
A speed type sensor that responds up to a frequency of about 500 Hz
Generally used. The amplification circuit 2 is provided from the vibration detector 1.
Optimal level of the signal inputting the output signal to the A / D conversion circuit 3
Amplify up to. In addition, the amplifier circuit 2 is an electric signal proportional to the speed.
The signal is integrated into an electric signal proportional to the displacement. Also amplification
Is the bell the A / D conversion circuit when the A / D conversion circuit 3 is over?
These signals automatically adjust to the optimum level. A / D change
Amplifier circuit whose input level of the conversion circuit 3 is set at this time
If less than 30% of the 2 range, it will automatically reach the optimum level
Adjusted. The optimized output signal of the amplification circuit 2 is output by the A / D conversion circuit 3.
Converted to digital output signal. This A / D conversion circuit has 10
Use bit A / D converter. Also FFT processor
In order to perform order analysis in 4, the A / D converter circuit 3
The sampling is performed with a multiplied pulse based on the rotation pulse.
For this reason, the rotation reference
It is detected as a rotation pulse signal from the loose detector 6. this
A photoelectric pulse detection sensor is used for the rotation pulse detector 6.
And attach a reflective tape to the reference position of the rotating body.
Ku. The rotation reference position of the rotating body is the trial weight or the rotating body.
Assembling the rotating body to use it as a reference for the mounting position of the weight
Select an easy-to-understand position such as a reference or key groove. Rotation pulse detection
The pulse signal of the device 6 is generated once per revolution of the rotating body
Is synchronized with the rotation speed. This pulse signal is multiplied by the multiplication circuit 7
And the balance calculation circuit 8. In the multiplication circuit 7, the pulse cycle of one rotation interval is set to a fixed short cycle.
Divide into periods. This device divides into 64, but this 64
The sampling of A / D conversion is controlled at the doubled cycle. Obey
The A / D conversion circuit 3 converts the analog signal into 1/64 cycle of the rotation speed.
Sampling every time. That is, the data of the A / D converter
The number of data is 1024 points (10 bits) and is always 16 rotations.
Data is captured, which is always
It will be constant. By doing so, the time axis signal detected by the vibration detector 1
Is a digital signal whose rotation is the reference axis in the A / D conversion circuit 3.
To be converted. This digital signal is FFT processor 4
The order is analyzed. That is, the rotation speed of the target machine is
Then, the vibration spectrum of this integral multiple (called order) is analyzed.
To be done. This device analyzes up to the 6.25th order of rotation and
Obtaining the phase of vibration based on the dynamic level and rotation pulse
There is. In S / V circuit 5, FFT processor 4 was used for order analysis.
Amplitude and phase data by extracting only the first-order component from the spectrum
Is stored and the S / V curve is created. In this S / V curve, the horizontal axis is the rotation speed and the vertical axis is the respective rotation speed.
Is a vibration level equivalent to. Figure 10 shows an example of S / V curve.
It represents data from 500 rpm to 3500 rpm. The operation of the S / V circuit 5 and the creation of the S / V curve will be described in detail.
And the pulse signal of the rotation pulse detector 6
The path 8 detects and instructs the A / D conversion circuit 3 to start sampling.
To show. The sampled data is the FFT processor
The order is analyzed in 4, and only the first-order component is analyzed in the S / V circuit 5.
Is entered. Next, the fact that the data was stored in the S / V curve
When the balance calculation circuit 8 is instructed by the / V circuit 5,
Sensor circuit 8 detects the next rotation pulse and detects the next data.
Is instructed to the A / D conversion circuit 3. This work
Is the rotation speed from the start of measurement to the rotation speed at the end of measurement
Up to automatically. In the example of Fig. 10, 1500 rpm to 350
It was measured up to 0 rpm. The S / V curve created here is a balun
Input to the calculation circuit 8 and simultaneously displayed on the display circuit 9.
It In this way to calculate the unbalance of the rotating body
Necessary vibrations are measured. Next, the calculation of the unbalance measurement is performed by the display circuit 9
The procedure of the balance calculation circuit 8 will be described using the display example of
It 1) Preparation for starting balancing The following conditions are input from the display circuit 9 of this device. Target machine rotation speed (minimum, maximum, rated speed)
Enter to determine the S / V curve creation speed range. Select the type of test rotation speed (one speed, two speeds).
In FIG. 2 (a), two speeds are displayed. Select the number of correction surfaces to correct the unbalance of the rotating body
Yes (one-correction surface, two-correction surface) In (a) of Fig. 10, two-correction surface
The surface is displayed. 2) Initial test This test measures the vibration corresponding to the unbalance of the rotating body.
It is a fixed test. Figure 10 shows the initial test instructions and
Figure 10 shows the display circuit displaying the S and V curves and Fig. 10
Use (a) to specify the cursor for the initial test, and (b)
(C) operates the rotating machine according to the specification and measures the S / V curve
It is an example. In Fig. 10 (b), A of the vibration detector 1 is measured.
Fig. 10 (c) shows the vibration data of the vibration detector 1
B is a display showing the measured data. Data rotated
From these S / V curves, measured at the rising
The two types of rotation speed that determine the
Each data is displayed in Fig. 10 (b) and Fig. 10 (c).
ing. Data applies with measurement points A, B test speeds 1, 2
The vibration vector is extracted from the S / V curve. This device
Two types of cursors, 2885.5 rpm and 3580.3 rpm, depending on the cursor
The rotation speed of the class is specified. 3) Trial test (1), (2) This test was selected in advance from the vibration data of the initial test.
Determine the magnitude and position of the imbalance on the correction surface
In order to attach the known trial weight to the correction surface,
It is a test to check the response. Figure 11 shows the second trial
Displaying exams. The first trial test is illustrated
Not done in the same way as the second. The trial weight attached to the correction surface 2 is the attachment position at 4g
The position is 90 ° in the opposite direction of rotation from the reference position of the rotating body.
It In the S / V curve of the test result, point A is (B), point B is
It is displayed in (c). Initialize from this S / V curve
The speed data closest to the two speeds specified in the test
Data is extracted. In this example, the 2882.0 rpm and 3590.3 rpm
The motion vector has been extracted. In addition, the vibration vectors and the test vectors of the trial tests (1) and (2)
The vibration vector of the initial test is compared by the balance calculation circuit 8.
If the difference is small, the balance calculation is calculated.
In order to increase the error, the retest comments are shown in Fig. 11.
Displayed in (b) and (c). In that case, Fig. 11
Increase the trial weight in (a) and re-acquire the data.
U 4) Determining the correction weight The determination of the correction weight is made by the balance calculation circuit 8 in FIG.
2 types specified in advance using the data of 2) and 3) above
Of the correction surfaces 1 and 2 that satisfy the target vibration value at the rotation speed of
Calculate the size and position of the modified weight. The formula used for this operation uses the known least squares method.
The arithmetic expression of is stored in the balance arithmetic circuit 8. 12th
(A) of the figure shows the result calculated by the balance calculation circuit 8.
This is an example displayed on the circuit 9. Achieved the target vibration value of 20 μm
Rotating with a correction weight of 2.3g required for correction surface 1 to do
Mounting position from the standard position of the body 128.22deg, correction surface 2
From the standard position of the rotating body 3.7g and the correction weight required for
The installation position 181.27deg is displayed. Also those
The expected vibration vector when the modified weight of
Displayed for measuring points A and B at rolling speed 1 and rotation speed 2
And as shown in Fig. 12 (b) and (c).
The balance state in all rotation speed areas is displayed on. The method for calculating the predicted vibration value after balancing is
Tol's superposition method is used. First, the current vibrometer
When the measurement is performed,
The amplitude and phase are sent to the vibration prediction calculation circuit 11 via the S / V circuit 5.
Remembered. The same will be applied when the next trial operation is performed.
Data is stored. And this trial operation
After finishing, the calculation of the amount and angle of balun weight is balun
The calculation result is calculated by the vibration calculation circuit 8 and the calculated result is the vibration prediction calculation time.
It is automatically entered in path 11. In the vibration prediction calculation circuit 11
Performs the following operations. here, In formula (2), the number M means the number of captured data,
For example, vibration prediction in the rotation speed range from 600 rpm to 3600 rpm
When performing, set the step size of the rotation speed at the time of loading to 20 rpm.
Then, M = (3600−600) / 20 + 1 = 151. Also, the first amplitude of the predicted vibration value is However, if there are M in general, the m-th
The second one is Is written. Initial vibration vector V expressed by equation (3) ₀ Is vibration
Obtained from the amplitude and phase data, the m-th x, y component is V
_0mx = | A _{0 m} | cos Θ _{0 m} ， V _0my = | A _{0 m} | sin Θ _{0 m} (1 ≦ m ≦
M) is calculated, and in this, | A _{0 m} Is the S / V circuit
In the amplitude of the first-order component of the rotation speed in the vibration signal analyzed in 5.
Yes, Θ _{0 m} Is the phase data. The influence coefficient matrix of equation (4) is the vibration data of the initial.
And the first-order component of the rotation speed obtained in each trial motion
Of amplitude and phase of trial weight and trial weight
make use of, Is calculated by. here, And each vibration vector is the same as the amplitude of the first-order component of the rotation speed.
It is composed of phases. M displays the amount of trial weight and mounting angle as a vector
It was Θ _n = Tan ^-1 (M _yn / M _xn ): Θ _n Is a trial weight
Mounting angle is n is 1 because this device is a balance that uses a maximum of 2 surfaces.
Or 2. In addition, W in equation (5) ^T Is the balance calculation times
It is calculated from the amount of balance weight calculated in path 8 and the mounting angle.
It is the vector quantity that is generated, which is the same as the number of n, and the maximum
There are four vector components. Formulas (2), (3), (5)
The subscript T inside means a transposed matrix. Also, this device displays three comments. When the correction weight is too large In this case, reduce the correction weight of the calculation result and instruct recalculation.
By doing so, the expected vibration vector is recalculated. Obey
Of course, the target vibration level cannot be cleared, but the vibration
It can be seen that can be reduced below the initial value. If the target vibration level is severe, consider the characteristics of the rotating body.
If a calculation result that satisfies the two speeds cannot be obtained. In this case, the target value is changed and recalculation is performed. If you only got one correction surface, the target value is acne
If you are not satisfied with the second speed. Increase the target value or set the number of correction surfaces to 2 and retest.
To do. If balancing is performed once, vibration can be reduced to the initial target value.
If not, the data from the trial test in 2) and 3) above
And re-calculate with new initial data of confirmation test.
You can With this device, repeat steps 2) to 4) above.
By returning it, the imbalance of the rotating body is corrected. this
The device is a portable device that houses everything from the vibration detector to the display circuit.
It is a type.

【The invention's effect】

According to the apparatus of claim 1, the present invention provides a rotation speed range of a target machine, a target vibration level to be reduced, the number of test rotation speeds, and the number of correction surfaces according to a balancing procedure supported by a display circuit of the apparatus. S / V created by S / V circuit
If the number of revolutions required for balancing is designated with the cursor while looking at the curve data, the correction weight is determined so as to satisfy the designated number of revolutions and displayed on the display circuit.
Further, when the input condition or the data is defective or the target vibration level cannot be reduced, the comment is displayed on the display circuit, so that the incorrect balance work can be prevented. Therefore, the following effects are obtained. 1) Two kinds of rotation speeds can be arbitrarily specified on the S / V curve, and a modified weight satisfying those data can be determined at one time. Therefore, it is necessary to perform a balance test for each rotation speed as in the past. The balancing work can be greatly reduced. In particular, it facilitates balancing of rotating bodies that have various critical speeds such as elastic shafts, and can also monitor the vibration characteristics of the viewpoint body at the same time with the S / V curve, so that machine operation and balance work can be performed safely. You can 2) When a wrong balancing work is performed, a comment is displayed, so that even a worker who has no experience can perform the balancing work of the rotating body. 3) Since it is portable, it can be easily carried to the site and can perform field balancing for all rotating machinery. According to the apparatus of claim 2, the rotation speed range of the target machine, the rated rotation speed, the operating load, the allowable vibration value under the operating load, and the target vibration level to be reduced according to the balancing procedure instructed by the display circuit of the apparatus. Enter the number of test rotations, the number of correction surfaces, etc., and specify the rotations required for balancing with the cursor while observing the S / curve data created by the S / V circuit. The modified weight is determined so as to satisfy the above data and displayed on the display circuit. Further, when the input condition or data is bad or the target vibration level cannot be reduced, a comment is displayed on the display circuit, so that an erroneous balance work can be prevented. Therefore, the following effects are obtained. 1) Two kinds of rotation speeds can be arbitrarily specified on the S / V curve, and a modified weight satisfying those data can be determined at one time. Therefore, it is necessary to perform a balance test for each rotation speed as in the past. The balancing work can be greatly reduced. In particular, it facilitates balancing of rotating bodies with various critical speeds such as elastic shafts, and can also monitor the vibration characteristics of rotating bodies at the same time with S / V curves, so that machine operation and balance work can be performed safely. You can 2) When a wrong balancing work is performed, a comment is displayed, so that even a worker who has no experience can perform the balancing work of the rotating body. 3) Since it is portable, it can be easily carried to the site and can perform field balancing for all rotating machinery. 4) The field balance of a machine such as a generator rotor whose vibration changes due to the occurrence of unbalance due to heat during operation can be easily performed without requiring skill. According to the apparatus of claim 3, the rotational speed range of the target machine, the target vibration level to be reduced, the number of test rotational speeds, the number of correction surfaces, etc. are input according to the balancing procedure supported by the display circuit of the apparatus. If you specify the number of rotations required for balancing with the cursor while observing the data of the S / V curve created by the S / V circuit, the weight will be fixed and displayed on the display circuit. At the same time, the predicted vibration value when the modified weight is attached and the rotating machine is operated is displayed. Further, when the input condition or the data is defective or the target vibration level cannot be reduced, the comment is displayed on the display circuit, so that the incorrect balance work can be prevented. Therefore, the following effects are obtained. 1) Two kinds of rotation speeds can be arbitrarily specified on the S / V curve, and a modified weight satisfying those data can be determined at one time. Therefore, it is necessary to perform a balance test for each rotation speed as in the past. The balancing work can be greatly reduced. In particular, it facilitates balancing of rotating bodies that have various critical speeds such as elastic shafts, and because the vibration characteristics of rotating bodies can be monitored at the same time with S / V curves, safe operation of rotating machinery and balance work can be performed. be able to. 2) When a wrong balancing work is performed, a comment is displayed, so that even a worker who has no experience can perform the balancing work of the rotating body. 3) After the balance calculation and before actually performing the balance adjustment, the vibration state of the rotating machine in all the rotation speed regions is displayed, so that the validity of the balance calculation can be confirmed and the efficiency of the balance work can be improved. 4) Since it is portable, it can be easily carried to the site and can perform field balancing for all rotating machinery.

[Brief description of drawings]

FIG. 1 is a system diagram of a portable balancing device according to an embodiment of the present invention, and FIG. 2 is a diagram showing an initial test instruction and an S / V curve in a display circuit of the portable balancing device of FIG. Figure (a) shows the instructions for the initial test, Figure 2 (b) shows the S / V curve at point A of the initial test, and Figure 2 (c) shows the S / V curve at point B of the initial test. Represent FIG. 3 is a diagram showing a trial test instruction and an S / V curve in the display circuit of the portable balancing device of FIG. 1, and FIG. 3 (a) shows a trial test instruction, and FIG. 3 (b). Represents the S / V curve at point A in the trial test,
Figure 3 (c) shows the S / V curve at point B in the trial test. FIG. 4 is a diagram showing a balance calculation result by the correction weight in the display circuit of the portable balancing device of FIG. 1, and FIG. 4 (a) shows an instruction of the correction weight.
The figure (b) shows the S / V curve of the point A by the modified weight, and the figure 4 (c) shows the S / V curve of the point B by the modified weight.
FIG. 5 is a system diagram of a portable balancing device according to another embodiment of the present invention, and FIG. 6 is a diagram showing an initial test instruction and an S / V curve in the display circuit of the portable balancing device of FIG. Fig. 6 (a) shows the instructions of the initial test, Fig. 6 (b) shows the S / V curve of point A of the initial test, and Fig. 6 (c) shows the S / V of point B of the initial test. Represents a curve. FIG. 7 is a diagram showing a trial test instruction and an S / V curve in the display circuit of the portable balancing device of FIG. 5, and FIG. 7 (a) shows a trial test instruction.
FIG. 7 (b) shows the S / V curve at point A in the trial test, and FIG. 7 (c) shows the S / V curve at point B in the trial test. FIG. 8 is a diagram showing a balance calculation result in the display circuit of the portable balancing device of FIG. 5, FIG. 8 (a) shows an instruction of a correction weight, and FIG. 8 (b) is an A by the correction weight. The S / V curve of the point is shown, and FIG. 8C shows the S / V curve of the point B by the modified weight. FIG. 9 is a system diagram of a portable balancing apparatus according to another embodiment of the present invention, and FIG. 10 is a diagram showing an initial test instruction and an S / V curve in the display circuit of the portable balancing apparatus of FIG. Figure 10 (a) shows the instructions for the initial test.
Figure (b) shows the S / V curve at point A in the initial test.
Figure 0 (c) shows the S / V curve at point B in the initial test. First
FIG. 11 is a diagram showing a trial test instruction and an S / V curve in the display circuit of the portable balancing device of FIG.
Figure (a) shows the instructions for the trial test, and Figure 11 (b).
Shows the S / V curve at point A in the trial test, and FIG. 11 (C) shows the S / V curve at point B in the trial test. 12th
FIG. 12 is a diagram showing a display example in which the balance calculation result by the correction weight and the predicted vibration value after the correction weight is attached are displayed over the entire rotational speed region in the display circuit of the portable balancing device shown in FIG. Represents the instruction of the modified weight, Fig. 12 (b) shows the S / V curve for the vibration prediction of point A by the modified weight, and Fig. 12 (c) shows the S / V curve of the vibration prediction of point B by the modified weight. / V curve. 1 A, 1 B: Vibration detector, 2: Amplification circuit, 3: A / D conversion circuit,
4: FFT processor, 5: S / V circuit, 6: Rotation pulse detector,
7: multiplication circuit, 8: balance calculation circuit, 9: display circuit, 10: load detection circuit, 11: vibration prediction calculation circuit.

Claims (3)

[Claims] 1. A vibration detector installed in a bearing of a rotating machine for converting vibration generated by a rotating body into an electric signal, and an amplifier circuit for amplifying an output signal from the vibration detector to an optimum signal level. A / D conversion circuit that converts the analog electric signal from this amplifier circuit into a digital electric signal, and this A / D
In order to synchronize the sampling of the conversion and the start of the sampling with the rotation of the rotating body, a rotation pulse detector that outputs a reference position provided in advance on the rotating body as an electric signal, and the sampling interval of the A / D conversion circuit are rotated. Based on one rotation of the body, the multiplication circuit that outputs the rotation order signal and the digital electric signal of the A / D conversion circuit are analyzed in order to perform the order multiple, and the level of the signal synchronized with the rotation and the rotation pulse are used as a reference. A fast Fourier transform processor that outputs the phase of the signal and the primary fundamental component corresponding to the rotation speed of the data analyzed by the fast Fourier transform processor, and the rotation speed and its vibration level are graphed.
The S / V circuit and the basic pulse signal of the rotation pulse detector are used to control the operation start of the A / D conversion circuit, and the unbalance amount of the rotating body and the above-mentioned amount are used by using the data of the primary basic component from the S / V circuit. It consists of a balance calculation circuit that calculates the unbalanced position from the reference position of the rotating body and a display circuit that displays the calculation result of this balance calculation circuit, and it is arbitrary from the graph of rotation speed and vibration level created by the S / V circuit The portable balancing device is characterized in that the unbalance amount and the position for reducing the respective vibrations are calculated by designating two rotation speeds. 2. A vibration detector installed in a bearing of a rotating machine for converting vibration generated by a rotating body into an electric signal, and an amplifier circuit for amplifying an output signal from the vibration detector to an optimum signal level. A / D conversion circuit that converts the analog electric signal from this amplifier circuit into a digital electric signal, and this A / D
In order to synchronize the sampling of the conversion and the start of the sampling with the rotation of the rotating body, a rotation pulse detector that outputs a reference position provided in advance on the rotating body as an electric signal, and the sampling interval of the A / D conversion circuit are rotated. Based on one rotation of the body, the multiplication circuit that outputs the rotation order signal and the digital electric signal of the A / D conversion circuit are analyzed in order to perform the order multiple, and the level of the signal synchronized with the rotation and the rotation pulse are used as a reference. A fast Fourier transform processor that outputs the phase of the signal and the primary fundamental component corresponding to the rotation speed of the data analyzed by the fast Fourier transform processor, and the rotation speed and its vibration level are graphed.
S / V circuit, a load detection circuit for detecting a load such as a turbine generator, the basic pulse signal of the rotation pulse detector and the A / D from the load signal detected by the load detection circuit
A balance calculation circuit for controlling the operation start of the conversion circuit and calculating the unbalance amount of the rotating body and the unbalanced position from the reference position of the rotating body by using the data of the primary basic component from the S / V, It consists of a display circuit that displays the calculation result of the balance calculation circuit, and can be specified by specifying any two rotation speeds and the operating load of the machine from the rotation speed and vibration level graphs created by the S / V circuit. A portable balancing device, which calculates an unbalance amount and a position for reducing vibration at a specified rotational speed and a specified load. 3. A vibration detector installed in a bearing of a rotating machine for converting vibration generated by a rotating body into an electric signal, and an amplifier circuit for amplifying an output signal from the vibration detector to an optimum signal level. A / D conversion circuit that converts the analog electric signal from this amplifier circuit into a digital electric signal, and this A / D
In order to synchronize the sampling of the conversion and the start of the sampling with the rotation of the rotating body, a rotation pulse detector that outputs a reference position provided in advance on the rotating body as an electric signal, and the sampling interval of the A / D conversion circuit are rotated. Based on one rotation of the body, the multiplication circuit that outputs the rotation order signal and the digital electric signal of the A / D conversion circuit are analyzed in order to perform the order multiple, and the level of the signal synchronized with the rotation and the rotation pulse are used as a reference. A fast Fourier transform processor that outputs the phase of the signal and the primary fundamental component corresponding to the rotation speed of the data analyzed by the fast Fourier transform processor, and the rotation speed and its vibration level are graphed.
The S / V circuit and the basic pulse signal of the rotation pulse detector are used to control the operation start of the A / D conversion circuit, and the unbalance amount of the rotating body and the above-mentioned amount are used by using the data of the primary basic component from the S / V circuit. A balance calculation circuit for calculating an unbalanced position from the reference position of the rotating body, and the primary basic component for calculating the balance state of the rotating body with respect to each rotation measurement region of the rotating machine at each vibration measurement point. A vibration prediction calculation circuit that stores and calculates the amplitude, phase, and number of rotations of the, and a balance calculation circuit or a display circuit that displays the calculation result of the vibration prediction calculation circuit, and the rotation created by the S / V circuit. Specify two arbitrary rotation speeds from the graph of number and vibration level, calculate the unbalance amount and position to reduce each vibration, and display the balance state after balancing for all rotation speeds. Special Portable balancing equipment to.