SU903766A1 - Method of detecting beginning of chemical thread production process checking - Google Patents

Description

The invention relates to the production of chemical filaments and can be used to identify the beginning of control of the process of their production.

There is a method of identifying the moment of the beginning of control of the process of obtaining chemical threads by determining the generalized process parameter and measuring its operational parameters at the time of the deviation of the generalized parameter from the set value [1]. ¹⁰

The disadvantage of this method is the low accuracy of detecting the onset of control, since the dispersion of the solidification zone is taken as a generalized _ts parameter, which does not take into account fluctuations of the surface of the thread and therefore cannot reflect information about a possible breakage of the thread due to these fluctuations jq, which ultimately can lead to belated control, i.e., after a break in the thread, when it is no longer possible to adjust the process.

The purpose of the invention is to improve the accuracy of detecting the moment the control begins.

This goal is achieved by the fact that when determining the generalized parameter, the amplitude and the period of oscillation of the surface of the thread are measured, the coordinate of the point of potential break of the thread is estimated from the measured amplitude and period of the thread, and the distance from the die to the point of potential break, the set value of which is selected, is used as a generalized process parameter equal to the distance from the die to the point of solidification of the thread.

In FIG. 1 shows a device for implementing the proposed method;

in FIG. 2 - experimental image of the filament on a two-dimensional solid-state receiver; in FIG. 3 “theoretical change in the diameter of the thread along its length in the process of obtaining.

903766 4 photocells. The light source is a helium-cadmium laser, driving its light into the center of the spinneret using a fiber light guide passed through the supply pipe. The device contains a spinneret I with single-row openings in diameter, thread 2, pipe 3 for supplying cooling air, light source 4, light receiver 5, voltage unit 6, microcomputer 7 ..

The method is as follows.

The light from the light source 4 falls on the receiver 5, passing by the filament 2 and gives on the receiver 5 its shadow image, which is recorded on it. The voltage block 6 converts the image signals in a convenient form for the microcomputer 7. In the microcomputer, the information obtained is processed, the oscillation amplitude A and period T are determined, and the coordinates of the potential discontinuity point are determined when solving the equation for x.

, 2Ϊ

R * = R _o r + Arin (j x + * f), where σί. is the exponent, which is calculated based on the change in amplitude A along the length of the thread;

t - the initial phase is equal to -, since the wave begins with a maximum at the dies;

R _o - the radius of the holes on the die.

A solid-state matrix from the spirit can be used as a light receiver.

Claims (1)

The invention relates to the production of chemical threads and can be used to detect the beginning control of the process of their half-sparks. There is a known method for detecting the start of monitoring the process of obtaining chemical threads by determining a generalized parameter. process and measurement of its mode parameters at the moment of deviation of the generalized parameter from the specified value 1. A disadvantage of the known method is the low accuracy of detecting the start of control, since the generalized parameter is adopted by the dispersion of the Solidification zone, which does not take into account vibrations of the thread surface and therefore does not may reflect information about a possible thread breakage due to these fluctuations, which ultimately can lead to late control, i.e., after a thread break, when the process cannot be corrected. The purpose of the invention is to improve the accuracy of detecting the moment of the start of control. The goal is achieved by determining the amplitude and oscillation period of the thread surface when determining the generalized parameter, estimating the coordinate of the potential break point of the thread by measuring the amplitude and period of the thread, and using the spin-down point to the potential discontinuity point, the specified value is used as the generalized process parameter. which is chosen to be equal to the distance from the die to the point of solidification of the thread. Fig, 1 shows a device for implementing the proposed method; in fig. 2 - experimental image of the filament on a two-dimensional solid-state receiver; Fig. 3 shows a theoretical change in the diameter of the thread along its length in the process of obtaining; The device comprises a spinneret I with a single-hole arrangement of holes along the diameter, thread 2, pipe 3 feeding cooling air, light source, light receiver 5, voltage block 6, microcomputer 7. The method is carried out as follows. The light from the light source falls on the receiver 5, the passage past the filament 2 and gives on the receiver 5 its shadow image, which is recorded on it. The voltage unit 6 presses the image signals into a convenient for microcomputer 7 form B microcomputer, the received information is processed, the amplitude of oscillation A and period T is determined, and the TOMKI coordinate of the potential discontinuity is solved when solving the equation for X. RX Ro-t + Arin (| -) ; where oC is an exponent indicator that calculates the outcome and the amplitude changes A along the length of the thread; f - the initial phase is equal to - as the wave begins with the maximum in the filter | |; RJJ is the radius of the location of the holes on the die. As a light receiver, you can use a solid matrix of 64 photocells. As a source of light - helium-cadmium laser, plant its light in the center of the spinneret using a fiber light guide passed through the air supply nozzle. The invention method of detecting the start of monitoring the process of obtaining chemical filaments by determining the generalized parameter of the process and measuring its mode parameters at the time of deviation of the generalized parameter from the specified value, so that, in order to improve the detection accuracy of the beginning control when determining the generalized parameter, measure the amplitude and period of oscillation of the surface of the yarn, estimate the coordinate of the point of potential break in the thread, and As a generalized process parameter using the distance from the spinneret to the point of potential rupture predetermined value is selected equal to the distance from GTniyu Lilery to the solidification point of the filament. Sources of information taken into account during the examination 1. USSR Author's Certificate No., cl. G 01 N 33/00, / / / --Off  jr / // ff ffje / fff e f / t / f F1 / g. / "/ 7 of f / fff / rfff / (f ya / fe / 77flff ff & / f7ff 0 FIG. I Fg / g J