SU1109618A1 - Meter of resistance of moving electroconductive threads - Google Patents

Abstract

MEASURING THE RESISTANCE OF MOVING ELECTRICAL CONDUCTING THREADS, containing a measuring circuit and electrodes having electrical contact with a controlled filament, characterized in that, in order to improve the measurement accuracy by eliminating fluctuations in the length of the measured portion of the filament, the electrodes are made in the form of tires placed along the length of the thread by eliminating fluctuations in the length of the measured portion of the thread, cylinder, and a controlled thread covering a cylinder with an arc of coverage d, with 2 liters where otg is the arc between the electrodes.

Description

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The invention relates to a measurement technique and can be used in devices for automatic continuous monitoring of linear resistance of electrically conductive filaments directly in a technological process, and the field of application is to control the linear resistance of dielectric filaments with an electrically conductive coating. When dielectric filament with an electrically conductive coating, such as bicarbolone type yarns, continuous automatic quality control of the coating of the electrically conductive layer is necessary. Control is advisable to carry out linear electrical resistance, which directly depends on the quality of the coating. A device for measuring the electrical resistance of a moving conductor is known, which contains electrodes in contact with a monitored conductor. The electrodes of the device are located on a moving trolley with a reciprocating mechanism, which makes it possible to control the resistance of the conductor during its movement L1 J. However, the presence of a moving trolley with a reciprocating mechanism complicates the design of the device and decreases its reliability. containing electrodes with a measuring circuit, having an electrical contact to connect the test object - a controlled filament to the measuring th circuit 2J. A disadvantage of the known devices is the insufficient accuracy of the oscillations of the length of the moving yarn when sagging it or vibrations. The purpose of the invention is to improve the accuracy of measurements by eliminating fluctuations in the length of the measured portion of the thread. The goal is achieved by the fact that in the gauge containing both the measuring circuit and electrodes that have electrical contact with a controlled filament, the electrodes are made in the form of tires placed along forming a rotating dielectric chitschitzra, and the controlled filament covers a cylinder with an arc of coverage d 182 and 2Ti oi - arc between the electrodes. FIG. 1 shows the proposed meter, a general view of FIG. 2 is the same, side view} in FIG. 3 is a block diagram of a device for measuring the linear resistance of a thread; in fig. 4 is a diagram of the output signal from the primary converter when the current resistance of the filament changes. The meter contains a dielectric cylinder 1, on the sides of which along the generators electrodes 2 and 3 are connected, connected with current collectors 4 and 5 to measuring circuit 6, for example an ohmmeter. Controlled by 7 7 covers the cylinder 1 and causes it to rotate as it moves. In this case, the arc cL of the coverage of the cylinder 1 by the thread 7 and the arc otj between the electrodes 2 and 3 (Fig. 2) are interconnected as follows: otj ot 29G. In this case, the controlled filament 7 is in contact with the electrodes 2 and 3 at each revolution of the cylinder 1. FIG. 3 is a block diagram of a device for measuring a linear resistance of a yarn consisting of a series-connected stabilized constant-voltage source 8, a primary converter 9 containing a cylinder 1 and two electrodes 2 and 3 located on its surface, a current amplifier 10 and a current meter 11 . The meter works as follows. Controlled thread 7, covering the cylinder 1, causes it to rotate. In this case, the filament in contact with electrodes 2 and 3 at each revolution of the shchindra. Since the electrodes are connected through current collectors 4 and 5 to the measuring circuit 6, then at each revolution of the cylinder, rectangular pulses arrive at the meter input, the amplitude of which is proportional to the resistance of the portion of the filament in contact with the electrodes . As an example, consider the operation of the meter circuit shown in FIG. 2. The DC voltage from the DC voltage source 8 is supplied to the primary converter 9. At each revolution of the cylinder 1 of the converter 9, the voltage from the DC voltage source 8 through the electrodes 2 and 3 and the resistance of the measured portion of the thread 7 is applied to the input of the current amplifier 10, from the output of which the signal goes to the current meter 11. If 29Г, where ci, is the arc between the electrodes, oL is the arc of the cylinder enveloping the filament, then as the cylinder rotates, a series of pulses enter the input of the amplifier 10, the amplitude of which is proportional to the resistance of the measured section (Fig. 3). From the output of the amplifier, the signal in the form of rectangular pulses is fed to the input

meter 11 current. The amplitude of the input pulse is proportional to the resistance of the section of the filament between the transducer electrodes. The duty cycle of the pulses depends on the ratio o /. The frequency of the pulses is proportional to the speed of rotation of the cylinder.

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Claims (1)

MEASURING RESISTANCE OF MOVING ELECTRICALLY CONDUCTING THREADS, containing a measuring circuit and electrodes having electrical contact with a controlled thread, characterized in that, in order to increase the accuracy of measurements by eliminating fluctuations in the length of the measured portion of the thread, the electrodes are made in the form of tires placed along the generatrix of a rotating dielectric cylinder , and the controlled thread covers a cylinder with an arc of coverage d, and d ₃ <d c2 l, where oC _e is the arc between the electrodes. 1 1109618