SU628414A1 - Shaft torque measuring device - Google Patents

Description

The invention relates to a device for measuring the torque on a shaft according to the scheme of a phase-impulse meter for the angle of twist of an elastic shaft, for which the intermediate shaft of the gas-pumping unit is used.

The known device for measuring the torque on the shaft, containing signal conditioners, logic elements and a recording device, does not provide the necessary accuracy of torque measurement (1) ..

The closest to the technical essence of the invention is a device for measuring the torque on the shaft, containing the first and second sensor signal formers, the first AND-OR logic element, the first inputs of two groups of which are connected respectively to the direct outputs of the first and second drivers, the second inputs of the same groups, respectively, with inverse outputs of the second and first drivers and the secondary circuit connected to the output of the logic element 2.

However, this device has insufficient accuracy of torque measurement.

The purpose of the invention is to improve the accuracy of torque measurement.

This is achieved due to the fact that a second AND-OR logic element and pulse sweepers are additionally introduced into the device, consisting of a single vibrator, a dynamic input connected to the output of the AND element, and an output to the input of the inverter-former of a gentle falling edge of the pulse, and the secondary The device is connected to the output of the second AND-OR element, the first and second inputs of two groups of which are connected respectively to the same inputs of the first AND-OR element, while connecting to the third inputs of these elements The outputs of odnovnbratorov so that the outputs of the first n of the second - to the inputs of the first and second groups of the first element, respectively, and the third and fourth one-vibrators - to the third inputs of the second and first groups of the second element AND-OR, respectively, and the first inputs of the AND elements are connected to the outputs

shapers so that the first and third - respectively with the first and second direct outputs, and the second and fourth - also respectively with inverse outputs of the first and second drivers, while the second inputs of the elements And and the outputs of the inverter drivers are connected crosswise, the first - with the third and the second - with the fourth, respectively.

FIG. 1 shows the described device for measuring the torque in bulk; in fig. 2 - timing charts of the device.

The device for measuring the torque on the shaft contains the first 1 and second 2 signal conditioners of sensors 3, 4, the first logical element AND-OR 5, the secondary device b, the second element t AND - OR 7 and the pulse extenders 8-11, each of which consists of a one-shot 12, an elementand And 13 and an inverter-shaper of a sloping trailing edge of a pulse 14.

Signals from inductive or optical sensors 3, the composition of which includes Interference signals, are fed to the inputs of sensors 1 and 2. From the outputs of sensors 1, 2, direct and inverse signals in the form of a series of square impulses whose edges 1x coincide. in time with the moments of the transition of the HALD signal through a zero value, go to the first inputs of the AND circuits included in the pulse extenders 8-11 and simultaneously to the first and second inputs of the first and second groups of elements AND - OR 5, 7. On the third These inputs of the same elements are received by rectangular pulses from the outputs of one-shot 12, the duration of which exceeds the duration of the chatter of the output signals of the drivers as a result of displacements of the moving and stationary parts of the sensors due to vibration and inaccuracy of the shaft, vibration of the supports, and electric effects. magnetic interference on the sensor and the communication line between the sensor and the driver inputs. In the operating modes of the gas pumping unit, the bounce duration usually exceeds the temporal displacement of the input signals, corresponding to the greatest torsional moment on the shaft.

FIG. 2 shows a time diagram of the operation of the device, corresponding to the case when the signal at the input of the driver

1 Prevents shaper input

2lia front and rear fronts. At the same time, at the outputs of the first and second one-shot, included respectively in pulse expander 8, 9, pulses are generated, in front of which 1 fronts of which coincide respectively with the leading fronts of the signals of the forward and inverse outputs of the imager, and the outputs of the expanders 10, 11

blocked by signals from the outputs of inverter-shapers of the expanders 8, 9. The formation of a sloping falling edge at the output of the inverter-shapers is necessary to prevent false triggering of the one-oscillator included in the expander, which receives a signal from this inverter-former at the time coinciding with the rear front and pulse of one-shot, the output connected to the input of this inverter-former.

In this case, a current flows through the secondary device equal to the average current value of a sequence of rectangular pulses formed in amplitude from the output of the first logic element 5. During real operation, the output of the first logic element 5 also has a sequence of pulses, the current through the secondary device is difference current and, therefore, is proportional to the angle of twist of the shaft and the moment, and the component of the current caused by interference, is absent.

Thus, the influence of noise and vibration is eliminated and the measurement accuracy is improved.

Claims (2)

1. US patent X 3604255, cl. 73-136a, 1971. 2. The UK patent number 1395911, cl. G 1 W, 1975 ..