RU2578469C1 - Device for determination of winding density of reeled materials - Google Patents

Abstract

FIELD: textile industry.

SUBSTANCE: invention relates to textile industry and can be used in equipment for winding of warp and fabric. Device for determination of winding density of reeled materials equipped with a pulse sensor measuring roll RPM, computer, pulse sensor of roll radius, relay unit, two analogue-to-digital converters, scaling unit, adder accumulator, a divider unit and recording device. Roll RPM pulse sensor is connected to the first input of relay unit. Second input of relay unit and input of first analog-to-digital converter are connected to roll radius sensor. Output of relay unit is connected with input of adder accumulator via series-connected second analog-to-digital converter and scaling block. Adder input is connected to the first input of dividing unit. Second input of diving unit is connected to output of computing unit. Computing unit input is connected with output of the first analog-to-digital converter. Output of diving unit is connected to recording device.

EFFECT: higher accuracy of winding density control with due allowance for operating voltage.

1 cl, 1 dwg

Description

The invention relates to the textile industry and can be used in equipment for winding warp and fabric.

A well-known density meter for winding long materials (USSR Author's Certificate No. 900168, IPC G01N 9/00, B65H 77/00, 1982) containing a diameter and speed sensor of the package shaft and a computing unit including an OR element, one-shot, two electronic keys , a pulse counter, a delay element and reading amplifiers, and a sensor for the number of revolutions and roll diameter is made pulse, while the roll diameter sensor is connected via an OR element to an odovibrator, a delay element and to the first inputs of the reading amplifiers, and the sensor rothé shaft package via first inputs of the electronic switches and counter input pulse counter connected to the second inputs of sense amplifiers, wherein the outputs of the monostable are connected to second inputs of the electronic switches, and the output of the delay element is electrically connected to an input pulse counter is zeroed.

The disadvantage of this device is due to the need to use an information reading system built on the basis of reed switches, which, in the presence of an eccentricity of the winding, reduces the measurement accuracy.

The prototype was taken to measure the density of winding long materials (USSR Author's Certificate No. 825444, IPC V65N 77/00, G01N 9/00, 1981), which contains a package speed sensor connected to the first input of the computing unit and a package diameter sensor, and also an integrator, a comparison unit and a reference generator, while the package diameter sensor is connected through an integrator to the first input of the comparison unit, the second input of which is connected to the package speed sensor through the reference generator, and the output of the comparison unit is connected to the second input of the computing unit.

The disadvantage of this device is its low accuracy, due to the possible deviation of the weight of the wound material from a given value. In this case, the device measures a certain average roll density without taking into account changes in the process of winding its internal state.

The technical result of the claimed invention is to improve the accuracy of control of the density of the winding, taking into account the existing stresses in it.

This result is achieved in that the device for determining the density of winding of roll materials, containing a pulse sensor of the number of rolls, a computing unit and a pulse sensor of the radius of the roll, contains a relay block, two analog-to-digital converters, a scaling unit, accumulating the adder, a division unit and a recording device moreover, the pulse sensor of the number of revolutions of the roll is connected to the first input of the relay block, the second input of which together with the input of the first analog-to-digital converter is connected s with a pulse sensor of the radius of the coil, and the output of the relay unit is connected through a second analog-to-digital converter and a scaling unit connected in series to the input of the accumulating adder, connected by its output to the first input of the division unit, the second input of which is connected to the output of the computing unit connected by its input to the output the first analog-to-digital converter, and the output of the division unit is connected to a recording device.

In this case, based on the signals taken from the pulse sensors of the roll revolution number and the roll radius at each revolution, the length of the wound material and the cross-sectional area of the roll are determined, and the density index is determined as their ratio.

The drawing shows a diagram of the proposed device.

Here, when the material 1 is wound into a roll 2, the rotation of the roll 2 is controlled by a pulse sensor of the number of revolutions of the roll 3, and the value of its radius is controlled by a pulse sensor of the radius of the roll 4. The device also comprises a relay unit 5, a first analog-to-digital converter 6 and a second analog-to-digital converter 7, a scaling unit 8, an accumulating adder 9, a computing unit 10, a division unit 11, and a recording device 12, the pulse sensor of the speed of roll 3 being connected to the first input of the relay unit 5, the second input of which, together with the input of the first analog-to-digital converter 6, is connected to the pulse sensor of the radius of the roll 4, and the output of the relay unit 5 is connected via series-connected second a tax-to-digital converter 7 and a scaling unit 8 (with a transmission coefficient of 2π) to the input of the accumulating adder 9, the output of which is connected to the first input of the division unit 11, the second input of which is connected to the output of the computing unit 10, connected by its input to the output of the first analog-to-digital converter 6, and the output of the division unit 11 is connected to the input of the recording device 12.

The device operates as follows.

The ratio of the length L of the wound material to the cross-sectional area S of the roll is taken as an indicator of the density of the roll. The indicated ratio is equal to the thickness B of the material inside the roll (B = S / L).

In the process of winding the material with tension in the roll, normal compressive stresses develop due to the pressure of the stretched upper turns on the lower ones, which leads to an increase in the density of the winding and a decrease in the thickness of the material inside the roll.

The device provides control of the length of the wound material and its radius on each revolution of the roll and allows you to take into account the influence of the stress state of the roll, indirectly associated with the thickness B of the material, in the full length of the material L.

The length of the wound material L is defined as the sum of the lengths ΔL of its turns on each revolution of the roll. In the process of winding material 1 into roll 2, the first input of the relay unit 5 from the output of the pulse sensor of the radius of the roll 4 receives the number of pulses corresponding to the radius R of the coil 2. At each revolution of the roll at the output of the pulse sensor of the number of revolutions of the roll 3, a pulse is generated that is supplied to the second the input of the relay unit 5, when triggered, the pulses from the pulse sensor of the radius of the roll 4 pass to the input of the second analog-to-digital converter 7, where they are converted into a digital code. The specified code, multiplied in the scaling unit 8 by 2π, represents the length of the coil ΔL. The lengths of turns obtained on each revolution of the roll are summed by the accumulating adder 9 into the full length L of the wound material.

Converted into a digital series by the first analog-to-digital Converter 6, the pulses arriving at its input from a pulse sensor of radius 4 are fed to the input of the computing unit 10, which provides the calculation of the cross section of the roll S according to the known ratio:

,

,

where R and R ₀ are the final and initial radius of the roll, respectively.

The digital values of the length L of the wound material and the cross section S of the roll are fed to the first and second inputs of the division unit 11, the output of which gives a measure of the density of the winding B, equal to the thickness of the material inside the roll, fed to the input of the recording device 12.

Claims (1)

A device for determining the density of winding roll materials containing a pulse sensor of the number of revolutions of the roll, a computing unit and a pulse sensor of the radius of the roll, characterized in that it contains a relay block, two analog-to-digital converters, a scaling unit, accumulating the adder, a division unit and a recording device, a pulse coil speed sensor is connected to the first input of the relay block, the second input of which, together with the input of the first analog-to-digital converter, is connected to the pulse sensor a radius of the coil, and the output of the relay unit is connected through a second analog-to-digital converter and a scaling unit connected in series to the input of the accumulating adder connected with its output to the first input of the division unit, the second input of which is connected to the output of the computing unit connected by its input to the output of the first analog -digital converter, and the output of the division unit is connected to a recording device.

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