SU1552023A1 - Method and apparatus for determining disbalance of rotors - Google Patents

Abstract

This invention relates to a balancing technique. The purpose of the invention is to expand the frequency range and increase the reliability due to the constant increase in the speed of rotation. Two marks with a shift of 90 ° are applied to the rotor 1. In statics, non-circularity is compensated using an analog adder 5, rotor 1 is driven into rotation, signals from sensors 2 and 3 of rotation angle and imbalance are converted into digital form, and using block 15 for calculating imbalance parameters, the amplitude and phase of the latter are determined, and output data to display unit 12. When the amplitude of the unbalance of the critical value, stored in comparison unit 14, is exceeded, a signal to stop is displayed on display unit 12. 2 sec. f-ly, 4 ill.

Description

ate to

oh

with

The invention relates to balancing technology and can be used for balancing rotors of various machines, as well as precision machines.

The purpose of the invention is to expand the frequency range and increase the reliability due to the gradual increase of the rotational speed with constant monitoring of the imbalance parameters.

1 shows a diagram of the implementation of the method, figure 2 is a block diagram of a device that implements the method; 5 in Fig.Z and 4 - the algorithms of the device.

The method of determining rotor imbalances is that two marks 20 are applied to the rotor surface with a shift of 90 °, the rotor's non-circularity is determined and compensated for, the latter is rotated, and the radial movements of the rotor are fixed during the passage of marks and at any 25 rotational speed determine the amplitude and phase of imbalance, respectively, as

BUT

A, if arctgr-,

where a ,, and a r are the radial displacements

passing through the rotor

first and second tags.

Device for determining disb

rotor balance contains rotation angle sensor 2 and rotor 1, which are connected in series to transducer 4, whose input is connected to unbalance sensor output 3, analog adder 5, amplifier 6, analog-to-digital converter 7 (ADC), block 8 interface with an analog signal and a digital-to-analog converter (DAC) 9., the output of which is connected to the second input of the analog adder 5, connected in series timer 10, the input of which is connected to the output of the angle sensor 2 and that the second input of the ADC 7, block 11 interfacing with digital signals and a display unit 12, the unit

13, connected with two-way communication with the block 8 interface with the analog signal and with the block 1 1 interface

with digital signals connected two-way with the last block

14 comparisons and block 15 calculating pa

with

five

0 5

0

35

Q dz p

unbalance meter, made in the form of a series-connected square calculating circuit 16, the input of which is connected to the second output of the conjugation block 8 with an analog signal, adder 17 and unbalance amplitude calculating circuit 18, the output of which is connected to the second input of the digital signal coupling block 11, and connected two-way communication with the third input of the latter, the unbalance phase calculating circuit 19, the input of which is connected to the third output of the conjugation unit 8 with the analog signal.

The device implements the method according to the above algorithms (Fig.3,4) according to the sequence of operations.

Draw around the circumference of the rotor 1 two marks with a shift of 90 °; Sensors 2 and 3 of rotation angle and imbalance are installed with the ability to read information from the rotor 1, namely, on the same axis, perpendicular to the axis of rotation of the object, in static mode (manually turning the rotor I or on the first revolution) at the moments of fixing marks by the sensor 2 The rotation angle using the unbalance sensor 3 is measured and stored, the magnitudes of the amplitudes at both points A and. In order to determine which of the points 1 or 2 is fixed first, simultaneously with determining the amplitudes of the signals, the time from fixing the first mark to fixing the second mark 2, is measured, then from the second to the first —eg, then determining if,, Ј ,, then the first label is X, the second is Y, and vice versa. This is necessary in order to determine the uniqueness of subsequent calculations. After measuring A10 and Ago, these values are compensated.

Next, rotor 1 is rotated and at subsequent revolutions of its rotation, during acceleration or in steady state, the signals at points are measured by the same method as in static mode, obtaining the parameters A and Aa. The imbalance is then determined by the expressions.

if- arctg | ; A

VA + A,

where I / is the imbalance angle1,

And - the unbalance j AI,

A.J-values of the amplitudes of signals measured dynamically, respectively, at points 1 and 2.

The values obtained on the nth revolution are compared with the critical unbalance values of the rotors of the machines, which are calculated based on the design features of the machine, and balance the rotor 1. In case of exceeding the critical unbalance, an alarm is issued to stop the spindle rotation.

The units of the device perform the following operations.

In the static mode or on the first rotation of the rotor 1, the zero value comes from the conjugation block 8 with the analog signals on the DAC 9, i.e. The second input of the analog adder 5 is supplied with a voltage equal to zero. The signal from the unbalance sensor 3 is converted in the primary converter 4, amplified by the amplifier 6, and converted into the ADC 7 digital code at the time of the coincidence of the mark from the angle sensor 2. The signal is then recorded in memory block 13 as a signal.

cash A

Yu

and

 at

depending on

Shows the values of timer 10, which calculates the time intervals between two marks. After turning on the rotation of the machine, on the third revolution of the rotor, the DAC 9 receives the values Afo and, moreover, when the first mark passes by the angle sensor 2, the A 0 value is output to the DAC 9, and it goes to the second input of the analog adder 5.

The signal received from the primary converter 4 is the sum of the unbalance signal and the shaft non-roundness signal. At the output of the analog adder 5, the unbalance signal is received, and at the moment of passing the label, the ADC 7 converts it into a digital code, which is recorded and received through conjugation block 8 with analog signals to block 15 for calculating imbalance parameters, namely calculating squares and unbalance phase calculating circuit 19.

After measuring both coordinates A and A, the values of phase q and the amplitude of the imbalance are calculated, which are compared in block 14 of comparison with the critical one entered there in advance. If the critical value has been exceeded, then through the interface 11 with digital signals to the display unit 12 is output

0

five

0

five

0

the stop signal and the unbalance parameter values; otherwise, only the unbalance parameters are output to the display unit 12.

The method implemented in the device allows balancing of any machines, including those whose rotation of the rotors is impossible at a fixed frequency (except for the working one).

Claims (2)

1. A method for determining the unbalance of rotors, which consists in driving the rotor into rotation, fixes its radial movements during one half-turn twice with a shift determine the amplitude and phase of the imbalance, characterized in that, in order to expand the frequency range and increase the trouble-free performance, Two marks with a shift of 90 ° are preliminarily applied to the rotor, the out-of-roundness of the rotor is compensated, and when rotating at any frequency, the amplitude and phase of imbalance are determined, respectively, as: A - VA + A. c / arctgT-, Ai where a. and A1 radial displacements measured during the passage of the first and second marks. 2. A device for detecting unbalance of rotors, comprising unbalance and angle of rotation sensors, an analog adder, a memory unit and an imbalance parameter calculation unit, which is characterized by the fact that, in order to expand the frequency range and increase trouble-free performance, -1 by a distributor, the input of which is connected to the output of the unbalance sensor, and the output - to the input of an analog adder connected in series by an amplifier whose input is connected to the output of an analog adder, an analog-digital conversion a teleme, the second input of which is connected to the rotation angle sensor and the timer input, a interface unit with an analog signal connected to a two-way communication with the memory unit, and a digital-analogue converter, the output of which is connected to the second input of the analog adder, display unit, comparison unit and connected bilaterally with the latter and the memory unit, the interface unit with digital signals, the input of which is connected to the timer output, and the output - to the input of the display unit, and the unbalance parameter calculation unit It is implemented as a series-connected square calculation, whose input is 520238 connected to the second output of the interface unit with an analog signal of the adder and an unbalance amplitude calculation circuit, the output of which is connected to the second input of the interface block with digital signals, and connected two-way communication with the third input of the last, an unbalance phase calculation circuit, the input of which is connected to the third the output of the interface block with the analog signal. ten Turn sensor Unbalance sensor 1 Start I, Output d DAC d zero value Start the timer. Reading the code received from ail. Write this code 8 first memory cell Read timer code Tj. Starting the timer from zero. Read code from ADC / U2 write this code 8o Second memory location Seo backward Ng (0 ° or 90) V, g Not one Overwriting the codebook from the first memory cell of the Torah / o and vice versa i, Fi & W To issue 8 UAH value of the code / Od-, Reading the code received from the ADC (tfj) Issue 5 DAC value code MKG Reading the code received from the ADC (N2) Calculation of the amplitude of Ag UKh,) (a / g) 2 and phase unbalance arctg jfc Displaying unbalance parameters on a display device Not d exceeded the critical value. Output, signal to emergency, stop Stop work Editor A. Shandor Compiled by Yu. Kruglov Tehred A. Kravchuk Proofreader M. Maksimishinets Order 323 Circulation 441 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 1552023 TWT / La Before. Phage Subscription