SU426131A1 - DEVICE FOR CONTROLLING THE DIFFERENCE BETWEEN THE MAXIMUM AND MINIMUM VALUES OF THE LINEAR SIZE DETAILS - Google Patents

Description

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The invention relates to the field of controlling the size of parts in mechanical engineering, in particular, to devices for controlling the difference between the maximum and minimum values of the linear dimension of a part.

Devices are known for monitoring the difference between the maximum and minimum values of a linear dimension of a part when it is moved to a predetermined distance, which contains a converter of the part size into an analog electrical signal, a node connected to it for determining the minimum and maximum values of the part size and the difference between them, the output of this node the driver signal about the output of the controlled difference of values outside the tolerance and the output node of the result.

However, in these devices, the node for determining the minimum and maximum values of the size of parts and the difference between them is made in the form of an analog electrical unit, which does not allow for sufficiently high control accuracy.

The proposed device differs from the known ones in that it is equipped with an automatic installation unit for the output signals of the converter of the part size in preparation for the measurement, and the node for determining the minimum and maximum values for the part size and the difference between them has been determined in the form of a python adder and two are installed at its inputs cumulative analog-to-digital converters connected to the output of a part-size converter, one of which serves to convert a negative signal, the other positive signal, and time quantization in analog-to-digital converters is greater than or equal to the duration of the movement of the part by

specified distance.

This makes it possible to increase the accuracy of control by using analog-digital technology to determine the minimum and maximum values of the part size and digital technology to determine the controlled difference. In addition, the use of digital technology in the proposed device enhances the ability to snore and provide control results.

Pa drawing shows a block diagram of the proposed device.

The device contains a component size converter 1 to an analog electrical signal, node 2 for determining the minimum

and the maximum values of the size of the part and the difference between them, the driver 3 signal about the output of the controlled difference of values outside the tolerance, the node 4 output results, for example, showing the device, and

node 5 of automatic installation on the bullets of the output signal of the converter 1 in preparation for measurement.

The output of converter 1 is connected to the input of node 2, whose outputs are connected to the driver 3 and node 4: The input of node 5 is connected, for example, to the output of converter 1, and the output of node 5 is connected to the control input of converter 1. Converter I is made, for example, view of sensor 6, reference element 7, amplifier 8, and rectifying element 9.

Node 2 is designed as a digital adder 10 and two cumulative analog-digital converters 11 and 12 connected to the converter 1 output. Two of these analog-digital converters are used to convert a negative signal to a digital code, and the other to convert positive signal to a digital code. The time quantization step in the analog-digital converters 11 and 12 is greater than or equal to the length of the non-displacement of the part for a given linear or angular distance. The specified distance for angular stirring, turning (rotating) the part can be, for example, one turn of the part. The accumulative analog-digital voltage or current converters are known to include a pulse generator, a pulse counter, a digital-analog feedback converter, a room generator, and a time quantization node (not shown in the drawing).

The pulse generator and the comparator can be made as a single element. In accumulative analog-digital converters 11 and 12, the accumulation of pulses of the specified generator in the counter is performed during the time quantization step in all cases when the input signal exceeds the absolute feedback signal in absolute magnitude. This allows converters 11 and 12 to determine the maximum value of the absolute value of the input signal per time quantization step. The frequency of the pulses produced by the generator in converters 11 and 12 must be no less than an order of magnitude higher than the maximum expected frequency of change in the size of the part.

At the preparatory stage of measurement, the device is pre-tuned, for example, according to a model measure, which is set to the measuring position, where it interacts with sensor 6. At the same time, node 5 automatically sets the output signal of transducer 1 to zero, after which the measurement stage can be started. At the measurement stage, the part being monitored is installed on the measurement position, where it interacts with the sensor 6. When the part moves linearly or angularly, the transducer 1 produces an analog electrical signal corresponding to the part size being measured. The polarity and absolute value of the parameter (current or voltage) of this signal depends on the direction and deviation of the measured size from a certain reference value corresponding to the zero output signal of the converter 1. The converters And and 12 register in the digital code the maximum absolute values of the current or the voltage of the negative and positive output signal of the converter 1. The adder 10 calculates the difference of the codes obtained in the converters 11 and 12. The controlled difference from the output is the sum ora 10 enters the generator 3, which generates a signal output of this difference is beyond the tolerance, the unit 4 and output the result.

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Subject invention

Device for monitoring the difference between the maximum and minimum values of the linear size of the part as it moves

for a given distance, containing a part-size transducer into an analog electrical signal, a node connected to it to determine the minimum and maximum values for the part size and the difference between

these, installed at the output of this node, are the signal conditioner about the output of the co-controlled difference of values outside the tolerance and the result output node, characterized in that, in order to increase the control accuracy, it is equipped with an auto-zeroing node of the output signal of the part size converter in preparation for the measurement, and a node for determining the minimum and maximum values of the part size and

the differences between them are made in the form of a digital adder and two cumulative analog-to-digital converters installed at its inputs connected to the output of a part-size converter, one of which

 to convert a negative signal, the other - a positive signal, and the time quantization step in analog-to-digital converters is greater than or equal to the length of movement of the part by a given

distance