SU1404943A1 - Device for measuring characteristics of fibrous materials - Google Patents

Abstract

The invention relates to a measurement technique, in particular, to devices for measuring the characteristics of raw cotton fiber. The invention makes it possible to increase the measurement accuracy by narrowing the dynamic range of the measured signals. For this, the device is equipped with an observant measuring chamber with irradiation means-. The NIN of the sample under study, with sound oscillations and means for measuring the magnitude of oscillations transmitted through the sample, is equipped with an additional camera 12 with a second receiver 13 acoustic oscillations placed in it, an automatic signal level control unit 17, amplifiers 14 and 15 AC, switch 10, control ; by the element 18, by the synchronization unit 19, the outputs of the receivers 5 and 13 of the sound waves are connected via amplifiers 14 and 15 of the alternating current and the switch 16 to the computing unit 10. Between the receiver 5 and the control unit L guide member 18 that serves unit 17 controlling the signal level which produced a decrease signal variation range of the receiver 5, which leads to an increase in signal at low values of the breaking load of the fibers, and consequently to improve the measurement accuracy. 1 il. se cl

Description

3

four

with

Jib

OO

The invention relate to the measuring and control t.khnike and can be used in the cotton industry.

The purpose of the invention is to increase the accuracy of measuring the breaking load of fibers by reducing the dynamic range of the measured signal.

The drawing shows a functional diagram of the device.

A device for determining the characteristics of fibrous materials contains an electric oscillation generator 1, an electric oscillation converter 2 in sound, a measuring chamber 3, a sample compaction mechanism 4 in a measuring chamber, a sound oscillation converter in electric 5, an electromagnetic oscillation generator 6 radiating an antenna 7, a receiving antenna 8 , 9 electromagnetic oscillation meter, fiber breaking load calculating unit 10, display unit 11, additional camera 12 5 additional receiver 13 sound oscillation, the first 14 and second amplifiers 15, 16. The switch unit 17 adjustment-level electrical oscillations, the control element 18, the synchronization unit 19.

The device works as follows.

A sample of material, such as raw cotton, is placed in chamber 3 and, using the compaction mechanism 4, compresses the sample to the specified values of bulk density. At one of the values of bulk density (300 kg / m), electromagnetic oscillations of a given frequency (from a range of 9 10 Hz), created with the help of generator 6 and radiating antenna 7. For a different value of bulk density (417 kg / m), sound oscillations of a given frequency (125 Hz) created by generator 1 and radiation 2 are passed through the sample. sample u Electromagnetic oscillations with the help of receiving antenna 8 are fed to an electromagnetic oscillation meter 9 and the measured attenuation value is fed to the input of calculation unit 10. Sound vibrations using the receiver 5, installed at the output of the camera 3, and the receiver 13, placed in the additional chamber 12, are converted into electrical oscillations

five

0

five

0

five

0

five

The electrical signal at the output of receiver 5 will be

Ui (/ 3), at the output of the receiver 13 will be

and 2 u, (o),

where and is the voltage at the output of the generator 1;

K, is the coefficient for converting electrical oscillations into sound by emitter 2; K is a coefficient for converting sound vibrations into electrical receivers 5 and 13; f (|}) - the function of attenuation of sound vibrations by a sample of material;

f (po) is the function of attenuating sound vibrations in the additional chamber 12,

The signal and, from the output of the receiver 5 enters the automatic signal level control unit 17, In block 17, the variable signal is converted into a constant signal, followed by extracting the square root of the signal magnitude. After the square-root extraction signal is rectified by a command from the synchronization unit 19, the voltage value is stored in a capacitor (not shown). Then, by a command from the synchronization unit 19, the voltage from the capacitor is applied to the control element 18, which changes the voltage on the radiator 2 sound vibrations at times, (Control element 18 can be made in the form of a controlled resistance at the field effect transistor). Therefore, using block 17, the signals at the output of the receivers 5 and 13 of the sound waves become as follows:

Ui

50

igKiKm (/ 5) dr

w:

 R

igKMKi (/ Zo) Uoi / U7

55

The signals and and U {, j, amplified by amplifiers 14 and 15, respectively, with the help of the switch 16 are entered by command from the synchronization unit 19 into

computational unit 10. The latter calculates the desired characteristics of the material, for example, the breaking load of the fibers and the moisture of the cotton raw material from the measured magnitudes of the attenuation of electromagnetic oscillations J., and the ratio of the voltages U. use to determine the rupture of the oscillations sound, mounted on the first input of the measuring chamber, the mechanism for compacting the sample in the measuring chamber, the transducer of sound vibrations into electrical, mounted on the first output will measure camera, electric generator

The magnitude of the ratio of the IQ magnetic oscillations connected to either voltage allows the emitting antenna to detect the effect of the square root error in block 17 on the second input of the measuring chamber at the second output of which the receiving antenna connected to log in

measurements of the breaking load of the fibers, since

U7

and

og

those. improve measurement accuracy. As a block 10, you can use a standard computer, for example C5-11. The calculated values of the material characteristics are numerically displayed in the display unit 11.

The proposed device allows improving the accuracy of determining the breaking load of fibers in cotton samples.

The dynamic range of the measured signal from the output of receiver 5, determined by the ratio of the max. / / Inn stresses at the maximum and minimum breaking load of the fibers in the known device (, dsc / and, lin) and in the proposed (and, „ks / U, j a) related by

 LIi i and.

Max

WWH

Consequently, the dynamic range of the measured signal in the proposed device is square root times less than the dynamic range of the known device, which leads to an increase in the signal at the output of the receiver 5 with large attenuations of sound vibrations and, consequently, to an increase in measurement accuracy.

Claims (1)

Invention Formula Apparatus for determining the characteristics of fibrous materials, comprising a generator of electrical equipment Order 3097/48 Random polygons Avenue, Uzkgorod, st. Project, 4 Q magnetic oscillations connected to a radiating antenna installed at the second input of the measuring chamber, at the second output of which a receiving antenna is installed, connected to the input 5 house of electromagnetic oscillation meter, the output of which is connected to the first input of the block for calculation of the breaking load of fibers, connected to the display unit, Q e so that, in order to increase the accuracy of measuring the breaking load of the fibers, it contains an additional camera, an additional receiver of sound vibrations, the first and second 5, amplifiers, a switch, an electric signal level adjustment unit, a control element, a synchronization unit, the measuring chamber being connected to the input by a third output 0 of an additional camera in which an additional receiver of sound vibrations is installed, the output of which through the first amplifier is connected to the first input of the switch, the second input connected to the output of the second amplifier, the third input of the switch is connected to the first output of the synchronization unit, the second output of which is connected to the first input of the adjustment unit the level of the electrical signal, and the third output is connected to the second input of the block for calculating the breaking load of fibers, to the third input of which the output of the switch is connected, output the sound oscillation receiver is connected to the input of the second amplifier and the second input of the electric signal level adjustment unit, the output connected to the first input of the control element, to the input of which the output of the electrical oscillator is connected, and the output of the control element is connected to . five 0 five 0 Circulation 847 Subscription