SU1226087A1 - Versions of methods for balancing rotating rotors - Google Patents

Abstract

This invention relates to a balancing technique. The purpose of the invention is to improve the accuracy of balancing due to the insensitivity of the method to phase errors. The sensor axes are set relative to the rotor axis at an angle oi different from 90 and 0 °; . The rotor is driven to rotate, an imbalance is measured. The amplitude of the axial oscillations of the rotor is determined. The magnitude of the axial oscillations of the rotor and the amount of imbalance are the same. Then oscillations are reported to the rotor, aligning their phase with the phase from unbalance. The grinding wheel brings the rotor to the rotor and ensures their interaction for each half-turn of the rotor before the setting -. imbalance 2 sec. , “3 Il. (L to to Oi about 00 sj

Description

This invention relates to balance. karpochnoy technique, namely the balancing of the rotors during their rotation.

The purpose of the invention is to improve the accuracy of balancing.

FIG. 1 shows a device for implementing the proposed method; in fig. 2 is a view A of FIG. 1; figure 3 - oscillation scheme of the rotor.

The device contains a platform 1 with prisms 2 on which the rotor 3 rotates, sensors 4 mounted on the swivel brackets 5. The brackets 5 are fastened with screws 6 on the platform 1. The device also contains an electrodynamic vibration exciter 7 that informs the rotor 3 through the bar 8 and platform 1 is forced to axial vibrations to interact with grinding wheels 9. Plank 8 is connected to platform 1 and vibration exciter 7 with screws 10. Platform 1 is mounted on four rods 11, providing three

degrees of freedom of the platform 1. For changes. There was their interaction, for each

This device has a measurement unit 12, and for controlling the operation of an exciter 7, a control unit 13.

The method is implemented as follows.

The axes of the sensors 4 are mounted with the help of the brackets 5 relative to the rotor axis at an angle ot different from 90 and 0 °. The rotor 3 from the drive (not shown) is driven into rotation, the unit 12 measures its imbalance and memorizes it. Then, the amplitude A of the axial oscillations of the rotor is determined.

On .fig. 3 shows a rotor oscillation pattern, where

And - the amplitude of the applied axial

vibrations from the vibration exciter; D is the oscillation amplitude due to imbalance;

R is the projection on the measurement axis (sensor axis) of the amplitude of oscillations of the rotor from axial oscillations and imbalances; oi is the angle between the axis of measurement and

rotor axis. As can be seen from the diagram,

About sin oi R And so l /. (one)

thirty

35

40

45

50

sin oi R A cosd.

half rotation of its (rotor) rotation. After a certain time, which is set depending on the amount of imbalance D of the rotor 3, the grinding wheel is retracted with the screw 10, the strips 8 detach the platform 1 from the wake-up vibrocarrier 4 and measure the unbalance of the rotor. If the residual unbalance is greater than acceptable, then again the Vio expression (2) is used to determine the amplitude A of the axial oscillations of the rotor and with the help of vibration exciter 7 it is reported axial oscillations. The phase shifter of the exciter control unit 13 combines the phase of the axial oscillations with the phase of imbalance and the supply of the grinding wheel, removing the unbalanced mass from the rotor.

Another option is also possible.

The axis of the sensor 4 using brackets 5 set relative to the axis of the rotor at an angle oi. equal to 90 °. The rotor 3 from the drive (not shown) is driven into rotation, the unit 12 measures its imbalance and memorizes it. Then determine the angle o from the expression oi

d arctg g-derived from the expression

from where

A D-tgoi,

(2)

At the same time, as follows from extrusion (2), the amplitude of oscillations of the rotor 3 in

S

0

the direction of the axis of the sensor 4 as from the unbalance of the rotor, and from the oscillations of the vibration exciter 7, are equal. This makes it possible to use both the unbalance sensor and the path of the unbalance measurement unit 12 to monitor the axial oscillations of the rotor. In this case, the measured value from the imbalance and from the axial oscillations of the rotor is the same. This eliminates the phase imbalance measurement errors associated with the nonlinear distortions of both the sensor 4 and the measurement system in the case. After storing the unbalance parameters with the aid of the strip 8 and screws 10, the exciter 7 is connected to platform 1 and oscillations with amplitude A are reported to it, then using the phase shifter of the exciter control unit 13 are combined in phase: oscillations of the rotor from the exciter with unbalance phase. The grinding wheel 9 is then guided to the rotor 3 in such a way that it is done. There was their interaction, for each

0

five

0

five

0

s

half rotation of its (rotor) rotation. After a certain time, which is set depending on the unbalance D of the rotor 3, the grinding wheel is retracted with the screw 10, the bars 8 unplug the platform 1 from the exciter 4 and the rotor imbalance is measured. If the residual unbalance is greater than acceptable, then again the Vio expression (2) is used to determine the amplitude A of the axial oscillations of the rotor, and axial oscillations are reported to it using vibration exciter 7. The phase shifter of the exciter control unit 13 combines the phase of the axial oscillations with the phase of unbalance and the supply of the grinding wheel, removing the unbalanced mass from the rotor.

Another variant of the method is also possible.

The axis of the sensor 4 using brackets 5 set relative to the axis of the rotor at an angle oi. equal to 90 °. The rotor 3 from the drive (not shown) is driven into rotation, the unit 12 measures its imbalance and memorizes it. Then determine the angle o from the expression oi

d arctg g-derived from the expression

(2), and the rotation of the bracket 5 sets the axis of the sensor at an angle o (Fig. 1 and 2). Then, using a strip 8 and screws 10, vibration exciter 7 is connected to platform 1 and her (following

axial oscillations with a constant amplitude A. The amplitudes R of oscillations of the rotor in the direction of the axis of the sensor 4 from the unbalance of the rotor D and from the oscillation of the vibration exciter 7 are equal. This makes it possible to use both the unbalance sensor and the same path of the unbalance measurement unit 12 for monitoring the axial oscillations of the rotor. In this case, the measured value from the unbalance and from the axial oscillations of the rotor is the same. This eliminates the phase errors in the measurement of the imbalance associated with the nonlinear distortions of both the sensor 4 and the measurement system as a whole. Then, using the phase shifter of the control unit 13, the vibration exciter 7 combines in phase the oscillations of the rotor from the vibration exciter with the phase imbalance. Then, the grinding wheel 9 is brought to the rotor 3 in such a way that the circle 9 about the rotor 3 interacts during each half-turn of its (rotor) rotation. After a certain time, which is set depending on the imbalance D of the rotor 3, the bird circle is retracted, ic using screw 10 and the bar 8, disconnect platform 1 from the exciter 7 and measure the rotor imbalance. If the magnitude of the residual unbalance is more than acceptable, then again determine the angle oL by the expression in (- arctg

turning the bracket 5, the sensor axis is set at the calculated angle, axial oscillations are reported to the rotor with the exciter 7, the phase shifter of the control unit 13 combines the oscillation phase of the exciter with the imbalance phase, the grinding wheel is brought to the rotor and the unbalanced mass is removed from the rotor.

The proposed method improves the accuracy of reproducing the phase of axial axes.

rotor oscillations due to insensitivity to phase errors, which improves the accuracy of balancing.

Claims (2)

1. A method of balancing rotors during rotation, which consists in measuring the imbalance by vibration sensors and removing the correction mass by the impact of a cutting tool on the rotor with their relative axial oscillation, characterized in that, in order to improve the accuracy balancing, the imbalance is measured at an angle to the axis of rotation of the rotor, and the amplitude of oscillation is chosen from the magnitude . tgot., where D is the amplitude of oscillation of the rotor from imbalance; o is the angle between the axis of the rotor and the axis of measurement. 2. The method of balancing the rotors during rotation, which consists in measuring the imbalance with a vibration sensor and removing the correction mass by the interaction of the cutting tool on the rotor with their axial relative oscillation, characterized in that, in order to improve the accuracy of balancing, the imbalance is measured in a plane perpendicular to the axial plane of the rotor, axial oscillations of a given amplitude inform it and deploy a vibration sensor in a plane parallel to the axis of rotation of the rotor passing through the axis of sensitivity a, by the angle determined by the dependency. dt arcug where a is the amplitude of the axial oscillations rotor; D is the amplitude of oscillation of the rotor from imbalance. Fig. / g 1 4JLJ Rotor axis 3 V FIG. J Compiled by S. Timofeev Editor A. Kozoriz Tehred V. Kadar Proofreader L. Pilipenko Order 2112/30 Circulation 778 Subscription UNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Type A 2 Production and Printing Enterprise, Uzhgorod, st. Design, D