SU1506366A1 - Automatic device for checking potentiometers - Google Patents

Abstract

The invention relates to a measurement technique and can be used for automated control of a functional characteristic, non-contact, accuracy of the location of intermediate leads, nominal resistance, and the formation of a group of potentiometers with identical characteristics. The purpose of the invention is to improve performance while maintaining control accuracy by automatically changing the speed of movement of the current collector 3 between measurement points by controlling drive 5 through regulating element 24 from signal delay block 26 through element 21, pulse counter 18 and digital-analog converter 25. The device also contains block 6 with terminals 7 and 8, angle converter 9, voltage source 10, comparators 11 and 12, logic elements 13, 19, 20, 21, measurement start block 14, control block 15, block 16 sets the reference point, the counter 17 pulses, the ADC 22, the recorder 23, the non-contact signaling device 27. 1 il.

Description

31506366

neither the speed of movement of current collector 3 between measurement points by controlling the drive 5 Through regulating element 24 from signal delay block 26 via element liTlH 21, pulse counter 18 and digital-to-analog converter 25. The device also contains a terminal 6 with terminals 7 and 8,

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angle transducer 9, voltage source 10, comparators 11 and 12, logic elements 13, 19, 20 and 21, measurement start block 14, control block 15, reference set-up block 16, pulse counter 17 of A / D converters 22, recorder 23, alarm 27 non-contact. 1 il.

The invention relates to a measuring technique and can be used for automated control of a functional characteristic, non-contact, accuracy of the location of intermediate leads, nominal resistance, and the formation of a group of potentiometers with identical characteristics.

 The purpose of the invention is to increase productivity while maintaining accuracy by automatically changing the speed of movement of the current collector between measurement points.

The drawing shows a functional diagram of an automated means of monitoring potentiometers.

The circuit contains a controlled potentiometer 1, a resistive element 2 and a current collector 3 mounted on the axis 4 of the drive 5 of the current collector, a block 6 with terminals 7 and 8, an angle converter 9, a voltage source 10, the first comparator 11, the second comparator 12, the element II 13, measurement start block 14, control block 15, setpoint reference block 16, first pulse counter 17, second pulse counter 18, first element OR 19, second element OR 20, third element OR 21, analog-to-digital converter 22, recorder 23, regulatory element 24, digital-analogue a converter 25, a signal delay unit 26, and a non-contact detector 27.

The output of the start-up unit 14 is connected to the first inputs of the control unit 15 and the non-contact signaling device 27. The second input of the non-contact signaling device 27 is connected to the output of the first comparator 11 and the first input of the AND 13 element, the second input of which is connected to the output of the angle converter 9, and the output of the AND 13 element is connected to the counting inputs of the first

counter 17 and the second counter 18 pulses. The setup input of the first pulse counter 17 is connected to the output of the reference setting unit 16, the input of which is connected to the first output of the control unit 15 and the second input of the third element OR 21. The second input of the control unit 15 is connected to the first input of the first element OR 19, the output of the second element OR 20 and the first input of the recorder 23, the second input of which is connected to the second input of the first element OR

19, the clock output of the first counter 17 pulses and the input of the block 26 of the signal delay. The information output of the first pulse counter 17 is connected to the first information input of the recorder 23, the second information input of which is connected to the output of the analog-digital converter 22 whose first input is connected to the output of the first element OR 19, the second input to the second input of the first comparator 11, terminal 8 to connect the beginning of the winding of the monitored potentiometer 1 and the first output of the voltage source 10, the second output of which is connected to terminal 7 to connect the end of the winding of the monitored potentiometer 1 and th input of the second comparator 12, a second input coupled to a first input of the first comparator I1, the average output of the potentiometer 1 from the current collector 3 and the third input of the analog-digital converter 22. The output of the second comparator 12 is connected to the first input of second OR

20, the second input of which is connected to the output of the non-contact detector 27. The output of the signal delay unit 26 is connected to the first input of the third OR element 21, the output of which is connected to the installation input O of the second pulse counter 18.

the output of which is connected to the installation input O of the second pulse counter 18, the output of which is connected to the input of the digital-to-analog converter 25. The output of the digital-analog converter 25 is connected to the first input of the regulating element 24, the second input of which is connected to the second output of the control unit 15, and the output of the regulating element 24 connected to the input of the actuator 5 of the current collector 3. The output shaft 4 of the actuator 5 of the current collector 3 is articulated with the output shaft of the angle converter 9.

Automated means of monitoring potentiometers works as follows.

Before starting the monitoring of the parameters of the tested potentiometer 1, it is connected to the block 6 via terminals 7 and 8 and the current collector 3 is installed outside the working angle, i.e. in the sector where there is no resistive element 2, or the area of the initial short-circuited turns. After this, a measurement triggering unit 14, which triggers a trigger pulse, which causes the non-contact detector 27, which is a trigger with separate inputs, is switched to the initial state and includes the control unit 1 5 so that its first output signal through the third element OR 21 sets the second counter 18 to the zero state and, through the reference set-up unit 15, brings the counter 17 pulses to the initial state, the digital value of which

corresponds to the com-40 trigger threshold, an even value. The signal from the vaparators 11 and 12. The second output signal of the control unit 15 at this time turns on the regulating element 24. Through the regulating element 24, the output voltage of the digital-to-analog converter 25 is transmitted to the input of the current collector drive 5, which the rotary current collector 3 and input shaft converter 9 angle. Then, as the current collector drive 5 rotates, the current collector reaches the beginning of the resistive element 2 of potentiometer 1 and the voltage increases at the input of the first comparator 11. In this case, the output pulses of the angle converter 9 through the second input of the element And 13 do not pass to the counting inputs of the first 17 and second 18 counts45

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The input of the recorder 23, which can be an electronic computer or microprocessor, periodically receives information into the recorder 23 from the second information input about the real resistance value and from the first information input about the reference resistance value and processes it and outputs it according to a given program. As the pulses accumulate in the pulse counter 18, the voltage at the output of the digits of the analog converter decreases according to a given law, depending on the required dynamic control, reaching a minimum value before the pulse from the pulse output of the pulse counter. In this case, the speed dvizhe0

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pulses when the voltage at the output of the current collector 3 reaches the threshold of the first comparator 11 at its output and, therefore, at the first input of the element I 13 a signal appears that opens the element 13 for passing the output pulses of the converter 9 to the inputs of the counters 17 and 18,

Thus, with further rotation of the output shaft 4 of the drive 5 together with the current collector 3, the input shaft of the angle converter 9, the angle d increases and the number of pulses in the counters 17 and 18 is proportional to the digital value of the angle d and, therefore, to the digital value of the reference impedance with linear characteristic o As the pulses accumulate in the counter 17 and pulses from the output of one of the triggers of the counter divider 17 pulses periodically, depending on the required number of controlled points The meter 1 receives pulses from the clock output to the input of the signal delay unit 26, the second input of the recorder and the second input of the first element OR 19 to the first input of the analog-digital converter through which the command starts the process of converting the real voltage value from the output of the current collector the output of potentiometer 1 and terminal 8 pads 6) of the monitored potentiometer, i.e. on the second and third inputs of analog-to-digital converter 22, to digit0

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plain value. By signal to the WTO

The input of the recorder 23, which may be an electronic computer or microprocessor, periodically receives information into the recorder 23 from the second information input about the real resistance value and from the first information input about the reference resistance value and processes it and outputs it according to a given program. As the pulses accumulate in the pulse counter 18, the voltage at the output of the digital-to-analog converter decreases according to a given law, depending on the required dynamic control accuracy, reaching a minimum value before the pulse from the clock output of the counter 17 pulses. The speed of movement of the output shaft of the current collector drive 5 is proportional to the output voltage of the regulating element 24 "

Thus, after the occurrence of each pulse from the clock output of the pulse counter 17, information is entered and entered into the recorder 23, and after a time determined by the delay in the signal delay unit 26, the second counter 18 is zeroed through the third OR element and The output of the analog-digital converter is the maximum voltage, which, through the regulating element, includes the highest rotational speed of the output shaft of the drive 5 of the current collector 3, which decreases according to a predetermined law as it approaches the measuring point. After the current collector 3 reaches the final turn of potentiometer 1, the second comparator 12 is triggered. If the output signal through the first input of the second element OR 20 turns off the control unit 15 and therefore the regulating element 24 stops the current collector drive 5, turns the recorder 23 through the first input and through the first input first element OR 19 analog-to-digital converter. In this case, the recorder 23 takes the nominal value of the monitored potentiometer, the working angle equal to the maximum value of the angle c per measurement cycle, to the corresponding memory cells. If during the control of potentiometer J a non-contact occurs between the resistive element 2 and the current collector 3, then at the output of the first comparator 11 there is a voltage jump, reversed by the jump sign, the opening element I 13, and the non-actuation indicator 27 changes to a different steady state and its output voltage through the second input of the second element OR 20 turns off the control unit 15 and, therefore, the actuator 5 of the current collector turns on the recorder 23 and through the first element OR 19 analog-to-digital converter 22. In this case uchae registrar 23 nekontaktirovani fixed value of the angle is stopped and control.

The proposed control tool allows you to increase productivity while maintaining control accuracy.

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The topics for automatically changing the speed of rotation of the output shaft of the current collector drive from the maximum to the minimum value when approaching the reference point of the control parameters of the potentiometer. The time of control when determining the parameters of multi-turn potentiometers is most significantly reduced, where the points through 180 within the working angle up to 7200 are monitored.

Claims (1)

Invention Formula Automated means of controlling potentiometers, containing a current collector drive, voltage source, terminals for connecting a winding of a controlled potentiometer, two comparators, an angle converter, a reference unit, two OR elements, an AND element, an analog-digital converter, the first pulse counter, a recorder, a signaling device non-contacting, control unit and starting unit, the output of which is connected to the first inputs of the control unit and the non-contacting signaling device, the second input of which is connected to the output the house of the first comparator and the first input of the element I, the second input of which is connected to the output of the angle converter, and the output of the element I is connected to the counting input of the first pulse counter, the installation input of which is connected to the output of the reference unit, the input of which is connected to the first output of the control unit whose second input is connected to the first input of the first OR element, to the output of the second element, OR, and to the first input of the recorder, the second input of which is connected to the second input of the first OR element and the clock output the first pulse counter, the informational {th output of which is connected to the first information input of the recorder, the second information input of which is connected to the output of the analog-digital converter, the first input of which is connected to the output of the first OR element, the second input to the second input of the first comparator, with a terminal for connecting the beginning of the winding of the monitored potentiometer and the first output of the voltage source, the second output of which is connected to the terminal for connecting the end of the winding of the monitored potentiometer and ne The second input of the second comparator, the second input of which is connected to the first input of the first comparator, the middle output of the potentiometer from the current collector, and the third input of the analog-to-digital converter, the output of the second comparator connected to the first input of the second element OR, the second input of which is connected the non-contact detector, and the output current of the current collector drive is articulated with the input shaft of the angle converter, characterized in that, in order to improve performance while maintaining control accuracy, enes adjusting member tsifroanalo about - and jg n 506366 O A tovy converter, a second pulse counter, a third OR element, and a signal delay unit, the input of which is connected to the clock output of the first pulse counter, and an output to the first input of the third OR element, the second input of which is connected to the first output of the control unit, and the output to the input installation in About the second pulse counter, the counting input of which is connected to the output of the element And, the second pulse counter through a digital-to-analog converter connected to the first input of the regulating element, the second input of which is connected to torym output control unit, and an output - to the input of the current collector Iprivoda. 15