DD261838A1 - CIRCUIT ARRANGEMENT FOR CONTROLLING A BALANCING OPERATION IN TWO LEVELS - Google Patents

Abstract

The invention relates to a circuit arrangement for controlling a balancing process in two planes, wherein over a Schwingungsmessgeraet signals for the determination of the angular positions and the size of the imbalances are output. According to the invention the Schwingungsmessgeraet is connected with its outputs for the signals for determining the angular position and for the signals for determining the size of the unbalance in two levels on a coupled with a phase encoder Steuergeraet and on the other hand, one of the outputs of the latter signals via an intermediate resistor with the noninverting and the other output of these signals are connected to the inverting input of a comparator whose output is connected to its non-inverting input via an adjustable resistor and to the control unit. This causes the balancing process takes place in the two levels alternately in steps and without high schaltungs- and programmtechnisches effort. figure

Description

Embodiment _;

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing, the block diagram of the circuit arrangement according to the invention is shown.

The block diagram shown in the figure shows the inventive composition of the vibration meter SM with the comparator K, the control unit ST and the phase encoder PG.

The vibration meter SM outputs for the first measuring plane the signal S1 for the size and the signal P1 for the determination of the angular position and for the second measuring plane the signal S 2 for the size and the signal P 2 for the determination of the angular position of the imbalance.

The signals P1 and P2 and S1 and S 2 are fed to the control unit ST.

The signal S1 is further fed via the resistor R1 to the non-inverting input of the comparator K, where it is referred to as signal ST.

The signal S 2 is further fed to the inverting input of the comparator K.

The output of the comparator K is fed to the control unit ST. Between the output of the comparator Kund whose non-inverting input is the variable resistor R2.

The phase encoder PG is connected via the signal P3 to the control unit ST.

The function of the circuit arrangement is as follows:

The control unit ST controls the balancing in both balancing planes in a known manner, for example by introducing liquid into chambers or by changing the position of mechanical masses.

The information in which angular position of the respective balancing plane mass equalization must be obtained wins the control unit ST by the signals P1 and P2 in connection with the signal P3.

In the control unit ST, depending on the signal S3, the balancing process for the first or the second balancing plane is activated as follows:

The signal S3 has a high level when the signal ST is greater than the signal S2, and the balancing process in the balancing plane 1 is activated by the control unit ST.

The signal S3 has a low level when the signal S2 is greater than the signal S1, and the balancing operation in the balancing plane 2 is activated.

The resistors R1 and R2 serve to set a certain hysteresis, so that the signal S3 has a high level when there is a positive voltage difference between the signals S1 and S2, and becomes low level when there is a negative voltage difference between the signals S1 and S2 ,

This ensures that the balancing in both balancing planes is carried out alternately in steps which are determined by the magnitude of the hysteresis.

The hysteresis also causes a slight fluctuation of the signals S1 and S2 to an average value does not lead to the constant switching of the comparator K.

The circuit arrangement according to the invention makes it unnecessary to take into account the mutual influence of both balancing planes, since, for example, when balancing in balancing plane 1, an imbalance enlargement results in balancing plane 2 for balancing in balancing plane 2.

The balancing process is terminated by the control unit ST when the signals S1 and S2 have reached the predetermined minimum values.

Claims (1)

Circuit arrangement for controlling a balancing process in two planes, in particular during operational balancing of rotating machine parts, whereby signals for determining the angular positions and the size of the imbalances are output via a vibration measuring device, characterized in that the oscillation measuring device (SM) with its outputs for the signals ( P2) for determining the angular position and for the signals (S 1, S2) for determining the magnitude of the unbalance in two planes connected to a control device (ST) coupled to a phase encoder (PG), and on the other hand one of the outputs of the latter signals (S 1) or (S 2) is connected to the inverting input of a comparator (K) via an intermediate resistor (R 1) to the non-inverting and the other output of these signals (S2) or (S 1), whose output is connected to its non-inverting input via an adjustable resistor (R2) and to the control unit (ST) is. For this 1 page drawing Field of application of the invention The invention relates to a circuit arrangement for controlling a balancing process in two planes, in particular when balancing the operation of rotating machine parts, wherein the determination of the angular position and the size of the unbalance via a Schwingungsmeßgerät. Characteristic of the known state of the art It is a circuit arrangement for determining the Ausgleichsgewichtgrößen- and phase positions for rotating machine parts in one or more levels known from DE-OS 2756829, in which are determined by testing vibration oscillations by means of transducers for determining influence coefficients of the vibration system and in a vibration meter, which by frequency selection and by Phase unbalance values are determined according to size and angular position, entered and the calculation of the balancing weights and phase positions taking into account the influence coefficients as well as the or obtained during one or more measuring runs unbalance or imbalance by means of an electronic computer. However, this solution has the disadvantage that it requires a high schaltungs- and programmtechnisches effort. Furthermore, a method for balancing of imbalance bodies is described in DE-OS 2740454, in which for the balancing in one or more levels values for the geometric dimensions of the rotor are entered into a measuring electronics and transducers are provided for determining the imbalances, the by the measured value measured values are stored in the correct phase and in phase and forwarded by a program sequence control a frame computer, which also the geometry parameters of the rotor to be balanced are entered from a memory, and determined from these values, the size and phase of the balance weights. Another disadvantage of this is the high circuit and program technical effort, since in addition to a frame and position calculator still a phase correct size memory and a geometry parameter memory are used. Object of the invention The aim of the invention is to provide a circuitry technically simple and feasible with little effort circuit arrangement for controlling a balancing process in two levels. Explanation of the essence of the invention The invention has for its object to provide a circuit arrangement for controlling a balancing process in two levels, which allows balancing of two mutually influencing balancing planes. According to the invention this object is achieved in that the vibration meter is connected with its outputs for the signals for determining the angular position and the signals for determining the size of the imbalance in two levels on a coupled to a phase encoder controller, and on the other hand, one of the outputs of the latter Signals is connected via an intermediate resistor to the non-inverting and the other output of these signals to the inverting input of a comparator whose output is connected to its non-inverting input via an adjustable resistor and to the controller. This ensures that the balancing process in the two levels takes place alternately in steps and without high circuit and program overhead.