SU1035411A1 - Device for measuring roll diameter - Google Patents

Abstract

DEVICE - FOR MEASURING ROLL DIAMETER, containing a sensor. roll speed, roll speed sensor, and counter. a digital-to-analog converter connected to its outputs, the first coincidence circuit, one input of which is connected to the output of the sensor of the angular velocity of the roll, and the output - to the counting input of the counter, which is necessary to increase the accuracy and speed iQm I im, j if-; one ; -:. "Measurement, it is equipped with two frequency comparators, a second coincidence circuit, an OR element, a trigger and a divider with a variable division factor, the output of the roll angle velocity sensor is connected to the input of the first frequency comparator and the first input of the second coincidence circuit, the second input of which is connected with the output of the second frequency comparator, and the output with the counting input of a divider with a variable division factor, the output of which is connected to the clock input of the counter and the first trigger input, the second i input of which single with the output of the OR element, and the output with the counting W input of the counter and divider with a variable division factor, the output of the roller’s angular velocity sensor is connected to the input of the second frequency comparator, the output of which is connected to the first input of the OR element, the second input of the OR element is connected to the output of the first , the frequency ratio of the rator and the second input of the first circuit of the SP 4 Coincidence,

Description

The invention relates to a measurement technique and can be used for contactless measurement of the diameter of coiled or rolled materials (e.g., magnetic tapes, paper, cinema).

A device for measuring the diameter of a roll, comprising a linear velocity sensor, an angular velocity sensor of the roll rotation, an integrator, key elements, a divider, is known. CO frequency

The disadvantage of the device is low measurement accuracy.

The closest to the present invention is a device for measuring the roll diameter, comprising a roll angle speed sensor, a roll speed sensor, a counter and a digital-to-channel converter connected to its outputs, the first drop circuit, one input of which is connected to the output of the roll speed sensor, and the output with counter counting input (2.

The drawbacks of the device are low measurement accuracy and speed,

The purpose of the invention is to improve the accuracy and speed of measurement.

The goal is achieved by the fact that a device for measuring a roll diameter containing a roll angle speed sensor, a roll angle sensor, a counter and a digital-to-analog converter connected to its outputs, the first matching circuit of which one input is connected to the output of the roll angular speed sensor, and the output with a counting input of the counter, equipped with two frequency comparators, a second coincidence circuit, an OR element, a trigger and a divider with a variable division factor, the output of the roll angle speed sensor Connected to the input of the first frequency comparator and the first input of the second coincidence circuit, the second input of which is connected to the output of the second frequency comparator, and the output to the counting input of a divider with a variable division factor, the output of which is connected to the clock input of the counter and the first trigger input, the second input of which connected x. the output of the OR element, and the output with the counting input of the counter and divider with a variable division coefficient, the output of the roller’s angular velocity sensor is connected to the input of the second frequency comparator, the output of which is connected to the first input of the OR element, the second input of the OR element is connected to the output of the first frequency comparator and the second input of the first matching circuit.

The drawing shows a block diagram of the proposed device.

The device for measuring the roll diameter contains roll 1, roll 2, roll angle speed sensor 3, roll angle speed sensor A, first comparator 5 second comparator 6, first and second schemes 7 and 8, element 5 OR, trigger 10, divider P variable division factor, the counter 12 and the digital-to-analog converter 13. The output of sensor 4 is connected to the input of frequency comparator S, the output of sensor 3 is connected to the input of frequency comparator 6, the outputs of comparators 5 and 6 are connected to two inputs of OR 9, the output of which is connected to the trigger input 10, the second input of which is connected to

output divider 11, and the output with the installation input of the divider 11 and the input of the counter 12.

The device works as follows.

When winding or unwinding the roll 2, the sensors 3 and produce frequency signals F and f2 proportional to the angular velocities of the roll and the roll. In the presence of these signals, Comparators 5 and 6 are turned on, which by their output signals permit the passage of frequency signals through circuits 7 and 8 and simultaneously turn on the logic element 9 OR, which by its output signal turns on trigger 10. The output signal of trigger 10 switches the divider 11 s. variable coefficient and the counter 12 to the lower limit (for example, from the limit of 10,000 to the limit of 1,000).

From this moment the device is ready for the first (coarse) measurement. Pulses with a frequency Fo through the open circuit 7 fill the electronic counter 12 until the frequency F through the open circuit 8 matches the divider 11 with a variable coefficient. The output pulse of the divider 11 rewrites the result of the electronic counter 12 into the memory of the digital-to-analog converter 13 and, at the end of the census, resets the result of the counter .2 to zero. Simultaneously with the census, trigger 10 is turned off, and the divider 11 with a variable coefficient and the electronic counter 12 are switched to an exact measurement limit. The digital code stored in the memory of the digital-to-analog converter 13 is converted into a current or voltage proportional to the diameter to be measured. At the same time, the digital code of the counter 12 can be converted on the digital display to the value of the diameter being measured. The board is part of an electronic counter 12, At the exact limit of measurement, trigger 10 is in the initial state, the divisor P with a variable coefficient has the maximum division coefficient, and the maximum number of rows is included in the electronic counter. For ease of processing, the division factor is recommended to choose a multiple of 10, and the number of bits of the electronic counter 12 is chosen from the calculation of the required speed at the first (coarse) measurement and the required accuracy at subsequent (accurate measurements. If the winding mode is broken (break or decrease in tension) permissible) measuring roll 1 loses connection with the material, and the sensor 3 stops producing a frequency signal, as a result of which the frequency comparator 5 is turned off. The output signal of the frequency comparator 5 closes the circuit 8 opens element 9 OR, the trigger 10 is reset and sets the divider 11 and the counter 12 to the zero state with its output signal and simultaneously switches them to the coarse measurement mode, while the value of the previous measurement is saved at the output of the digital-to-analog converter 13 until a new value is formed in the counter 12 and the census signal transfers it to the digital-to-analog converter 13. The application of the present invention, in particular in the winding and unwinding irrigation units Casting, cutting and other machines, where there are stringent requirements for the winding and unwinding of materials, allows to improve the quality indicators of the winding-expanding devices, quickly monitor the diameter of the rolled materials.

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Claims (1)

(^ 4) DEVICE FOR MEASURING A ROLL DIAMETER, comprising a sensor. roll angular velocity, roll angular velocity sensor, and counter. a digital-to-analog converter connected to its outputs, the first coincidence circuit, one input of which is connected to the output of the roll angular velocity sensor, and the output is connected to the counter counter input, which is necessary in order to increase the accuracy and measurement performance, it is equipped with two frequency comparators, a second matching circuit, an OR element, and trig. a ger and a divider with a variable division coefficient, the output of the roll angle sensor is connected to the input of the first frequency comparator and the first input of the second coincidence circuit, the second input of which is connected to the output of the second frequency comparator, and the output to the counting input of the divider with a variable division coefficient, the output of which connected to the clock input of the counter and the first input of the trigger, the second input of which is connected to the output of the § element OR, and the output to the counting input of the counter and divider with a variable 'division factor , The angular velocity sensor output roller connected to the input of the second frequency comparator, whose output is connected to the first input of the OR gate, the second input of the OR gate is connected to the output of the first, the frequency comparator and a second input of the first coincidence circuit.