SU729458A1 - Device for automatic balancing of grinding disks - Google Patents

Description

This invention relates to the automatic balancing of grinding wheels during their rotation during idling or grinding. Arrangements for automatic balancing of grinding wheels are known, which contain correction weights mounted on a balancing grinding wheel, connected in series by a vibration sensor, an imbalance detection circuit and a switching unit associated with correction weights l. The disadvantage of such devices is low balancing accuracy and low noise immunity. The closest to the invention by. The technical essence and the achieved result is a device for automatic balancing of grinding wheels, comprising a housing, an actuator fixed therein for rotating a grinding wheel and a vibration sensor, an imbalance determination circuit consisting of a measuring amplifier and a detector, and an extreme controller including a threshold unit, switching unit and corrective loads G2. However, the extreme controller of the device operates in the threshold threshold of the threshold unit, so there is always an external disturbance in its output signal, which causes false switching of corrective weights and, consequently, reduces the accuracy of balancing. The purpose of the invention is to improve the accuracy of balancing. For this, in the proposed device, the extremal controller is equipped with an amplitude discriminator, the input of which is connected to the detector output, and the output is connected to a switching unit, a tracking system connected to the amplitude discriminator, a second threshold unit, a control trigger and two coincidence circuits, the inputs of both the threshold blocks are connected to the detector output, the outputs to the control trigger input, the inputs

the coincidence circuits are connected to the outputs of the amplitude discriminator, the switching unit and the control trigger, and the outputs are with corrective loads.

The tracking system of the device can be made in the form of a series-connected electronic key, an integrating circuit and a matching inverting amplifier, and a switching unit in the input of two series-connected triggers.

FIG. 1 shows a block diagram of the device; in fig. 2 - performance of the threshold unit. The device comprises a housing 1, a drive 2 fixed therein for rotation of the grinding wheel and a vibration sensor 3, an imbalance detection circuit consisting of the measuring amplifier 4 and detector 5 connected in series, and an extreme controller 6. The extreme controller 6 contains correction loads 7 e installed on the shaft of the grinding wheel, the switching unit 8, the amplitude discriminator 9, the first input of which is connected to the output of the detector 5, and the output through the imaging unit 1O to the switching unit 8; the following system, made in the form of a sequentially connected electronic key, 11, an integrating circuit 12 and a matching inverting amplifier 13 and connected to the amplitude discriminator 9J, two threshold blocks 14, 15j, a trigger 16 and a coincidence circuit 17, 18. The inputs of the threshold blocks 14, 15 are connected to the output of the detector 5, the outputs to the input of the control trigger 16, the inputs of the matching circuits 17 and 18 are connected to the outputs of the amplitude discriminator 9, the switching unit 8 and the control trigger 16, and the outputs to the correction weights 7o Switching unit 8 consists of two series-connected flip-flops 19 and 2O and is also associated with correction weights 7. The device operates as follows 50.

When an imbalance of the grinding wheel occurs during its operation, the vibrations of the housing 1 are sensed by the vibration sensor 3, amplified in the measuring amplifier 4 and converted by the detector 5 into a constant voltage, the amplitude of which is proportional to

the magnitude of the imbalance. From the detector 5, the signal arrives at the first input of the amplitude discriminator 9, the output of which through the tracking system is connected

with your other entrance. The shaper 10 serves to generate a pulse of switching of the balancing modes, which is fed to the input of the switching unit 8. The signal from the detector 5 also enters the threshold blocks 14 and 15, which are used to generate the control pulses for the trigger 16, and therefore the matching circuits 17 and 18.

The threshold unit 14 generates a pulse

Claims (2)

The corrective weights 7 begin to move in the opposite direction. The imbalance of the unbalance occurs and the output of the amplitude discriminator 9 causes a voltage to open the electronic key 11 through which the integrate is carried out at an unbalance level greater than the level 15, and unbalance level less than A (see Fig. 2). The signals from the outputs of the matching circuits 17, 18 control the position of the correction weights 7 by correcting the imbalance. When the imbalance exceeds the level A, the threshold unit 14, the sensing signal from the vibration sensor 3 through the measuring amplifier 4 and the detector 5, converts the control trigger 16, which opens the circuit 17 and 18 of the coincidence Vj. Depending on the state of the trigger 19 of the switching unit 8, a voltage will be applied that controls the movement of the correction weights 7. If this increases the imbalance (the direction of the movement of the correction weights is wrong), then the voltage at the first input of the amplitude discriminator 9 and at its output, a signal appears that controls the driver 1O. In this case, the driver 1O produces a pulse, which closes the circuits 17 and 18, the coincidences, the balancing process is terminated. At the same time, switching trigger 19 of switching unit 8 and switching of correction weights 7 occur. Integrating circuit 12 begins to discharge through matching inverting amplifier 13, and the voltage at the second input of amplitude discriminator 9 increases until it equals the voltage at input Bx1. The pulse from the output of the former 1O disappears, circuits 17 and 18 of the coincidence of the open circuit 12. This causes an increase in the voltage at the input of its inverting amplifier 13 and a decrease in the signal at the second input of the amplitude discriminator O. Thus, the voltage change is monitored the first entry. When the imbalance minimum point is passed, the voltage increases at the first input, the driver 10 generates a pulse, which stops balancing and switches the switching unit 8. The balancing process lasts until the level of imbalance becomes less than A j (see Fig. 2). In this case, the threshold unit 15 switches the control trigger 16 and the matching circuits 17 and 18 and disables the correction weights 7. Introduction to the extreme controller of the device for automatic balancing of the grinding wheels of the amplitude discriminator, tracking system, second threshold unit, controlling trip amplifier . Gera and two coincidence circuits improve the noise immunity of the device, which improves balancing accuracy. Apparatus of the Invention A device for automatic balancing of grinding wheels, comprising a housing, a drive for rotating the grinding wheel fixed therein and a vibration sensor, an imbalance detection circuit consisting of a measuring amplifier and a detector, and an extreme controller, 586 including a threshold unit, a switching unit and correction weights It is said that, in order to increase the accuracy of balancing, the extreme regulator is equipped with an amplitude discriminator, the input of which is connected to the detector output, and the output is with a switching unit, a tracking system connected to an amplitude discriminator, a second threshold unit, a control trigger, and two coincidence circuits; enter; both threshold blocks are connected to the detector output, the outputs to the control trigger input, the inputs of the coincidence circuits are connected to the outputs of the amplitude discriminator, the switching unit and the control trigger, and the outputs to corrective weights. 2. The device according to claim 1, wherein the tracking system is made up of a serially connected electronic key, an integrating circuit and an inverting matching 3. The device according to claim 1, characterized in that that the switching unit is made in the form of two series-connected triggers. Sources of information taken into account in the examination 1. Patent HelicopiaJ f 1212423, cl. F 16 f 15/22, 197O. 2.Gorbunov, B.I., et al. Automatic control systems for balancing grinding wheels. - Collection Electric drive and automation in mechanical engineering, vol. 24, you, M., 1974 (prototype). SaMHCiJpoSHU process