SU823840A1 - Device for monitoring mechanism kinematic errors - Google Patents

Description

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This applies to technical measurements in mechanical engineering, in particular, to devices for controlling the kinematic error of mechanisms. .....; ,, -; ..

A device is known for monitoring the kinematic norpeifflity of gears / total optical sensors of the rotation angles of the initial and final links of the controlled gear, the links of which are connected to the phase-measuring circuit, which is connected with the recording device Sh. The device for controlling the kinematic error of the mechanisms containing sensors of the angles of rotation of the beginning and end links of the controlled mechanism, to the outputs of which are connected in series filters, amplifiers-formers and amplitude-pulse converters connected to the phase meter inputs, a combination unit connected between one of the power amplifiers and the amplitude-pulse converters of the final link, a phase shifter, a drive and a phase shifter and a power source, a synchronizer, a multiplier unit and an adder .

which inputs through the inverter and without; it is connected to the inputs of amplitude-pulse converters, and the output of the phase meter is connected to a recording device 2

The main disadvantage of these devices is the low control accuracy, due to the instability of the rotational speed of the drive.

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

The goal is achieved by the fact that the rotation angle sensor of the final link is made in the form of an optical phase shifter with a reading unit connected via an amplitude-pulse converter and an overlapping unit with one of the phase meter inputs and two raster disks, one of which is fixed on the final link of the monitored mechanism and the other is rigidly connected to the motor shaft of the phase shifter, synchronized in rotational speed with the drive.

The drawing shows a block diagram of the device.

The device contains a sensor 1 and 2 angles of rotation of the initial and final links of the monitored mechanism 3. Sensor 1 is the drive of mechanism 3, and sensor 2 is made in the form of an optical phase shifter with raster 4 and disks 4 and 5. The raster disk 4 is connected to the final link of mechanism 3. The disk 5 is rigidly connected to the engine shaft. B. The photoelectric reading unit 7 is connected via an amplitude-pulse converter 8 and a combination unit 9 to one of the inputs of the phase meter 10, the output of which is connected to a recording device 11. The same input of the phase meter 10 through the combination block 9, amplitude pulse converter 12 the former 13 and the band-pass filter 14 are connected to the motor winding. b. The other input of the phase meter 10 through the amplitude-infrared pulse converter 15, the amplifier-former 16 and the band-pass filter 17 is connected to the power winding of the angle sensor 1. The power winding of the angle sensor 1 through the synchronizer 18 is connected to the power source 19, and the motor power supply b connected to source 19 via synchronizer 18 and multiplicity block 20. Synchronizer 18 is connected to output of adder 21, one of the inputs of which is connected via inverter 22 to output of pulse-amplitude converter 15 of the initial link, and the other input is connected with the output of the amplitude-pulse converter 12 of the final link.

The device works as follows.

When the sensor 1 rotates due to the cortex grooves, an alternating voltage with a frequency of tooth pulsations proportional to the speed of rotation of the angle sensor 1 is modulated in its windings. The signal separated from the winding through a band-pass filter 17 that cuts off all frequencies except the frequency of tooth pulsations converts the amplifier of the forma Telem 16 last: the impulses of rectangular shape. The resulting pulse sequence is converted by the amplitude-pulse Converter 15 to a constant 9 .00 voltage proportional to the pulse pulse period and supplied to one of the inputs of the phase meter 10. To the other input of the phase meter 10, a signal that is total or difference two signals is fed through the block bb 9. . On one input block

combining 9 through an amplitude-pulse converter 12, amplifier Shrove 13 and a band-pass filter 14 receives a signal with a frequency of pulsation of the motor 6. At its other input, through a pulse-amplitude converter 8, a signal comes from the reading unit 7.

The optical phase shifter is used as a scale converter of the phase difference between the mutual positions of the initial and final links of mechanism 3, which is due to the presence of kinematic errors in it. A raster disk 5 connected to the motor shaft b synchronized in rotational frequency with the angle sensor 1 modulates the luminous flux generated by the light source of the reading unit.7, and the raster disk 4 interrupts this luminous flux

0 in accordance with the change in the rotational speed of the final link of the mechanism 3. Thus, the period of the following photocurrent pulses of the reading 7 changes and in proportion to this in step 5 the current value of the phase difference between the signals of sensors 1 and 2 angles of rotation of the monitored mechanism 3. A signal proportional to the phase difference and corresponding to the nature of the change in the Kinematic error is output from the phase meter to the registering device 11.

In order to eliminate measurement errors caused by the synchronization of the frequencies of the angular sensor 1 and motor b sensors, a reverse connection was inserted in the device, including amplitude-pulse converters 12 and 15, an inverter 22 and an adder 21, working as follows.

The signals extracted from the windings of sensor 1 and motor 6 with a frequency of serrated pulsations using band-pass filters 14 and 17, shaping amplifiers 13 and 16, and amplitude-pulse converters 12 and 15 are transformed into a constant voltage proportional to the period of the signals. These voltages are fed to the inputs of the adder 21 in the opposite polarity, which is reached. turning on the inverter 22. At the output of the adder 21, a desynchronization signal appears, which is supplied

5 to the input of the synchronizer 1B. The synchronizer takes into account this value and polarity and brings the device into the required synchronous mode of operation of the sensor 1 and the engine 7.

The proposed device allows to conduct scans with almost any desired error, regardless of the speed of rotation of the output link and with a very high sensitivity, as well as controlling the speed of rotation of the &Ph; amp of the phase shifter in a wide range can significantly change the resolution and sensitivity of the optical phase shifter .

Claims (2)

Invention Formula A device for controlling the kinematic error of the mechanisms, containing sensors for the angles of rotation of the initial and final links of the monitored mechanism, whose outputs are connected in series with bandpass filters, shaping amplifiers and pulse-amplitude transducers connected to the inputs of the phase meter, a combination unit connected between one of the phase meter inputs and end-stage amplitude-pulse converters, phase shifter, photodisporter drive and distributor with power supply, synchronizer, cr unit The accumulator and the adder, whose inputs through the inverter and without it are connected to the outputs of amplitude-pulse converters, and the output of the phase meter are connected to a recording device, characterized in that, in order to increase the accuracy of control, the angle sensor of the end link is made as an optical phase changer with a readout unit connected through an au-pulse-voltage converter and a combination unit with one of the phase meter inputs, and two raster discs, one of which is fixed on the final link of the controlled mechanism PCA / and the other rigidly connected to the shaft-engine phase shifter synchronized with YRIVODOM on rotational speed. Information sources, . taken into account during the examination 1. BA Taits, N. N. Markov Accuracy and control gears. L., Mapshnostroenie, 1978, p. 25-26. 2. USSR Author's Certificate No. 453563, 01 B 7/28, 1972 (prV; totype),