SU1397711A1 - Device for checking sizes of articles of rolling mill - Google Patents

Abstract

The invention relates to automation, measurement technology and can be used in the rolling industry. The goal is to expand the functionality by issuing information on possible measurement errors caused by contamination of optical fibers with extraneous opaque objects. During the movement of the light beam through the fiber 3 (4) at the output of the photodetector 5 (6), a group of pulses appears with a number depending on the number of contaminants, but not less than two. When Event 3 is contaminated, triggers 9 and 10 are set to State O from the previous measurement cycle. The current pulse from the photodetector 5 sets the triggers 11 and 12 to the state O. At the output of the OR 8 circuit, O appears. After the end of the first pulse, the trigger 9 moves to trigger 1, and the second pulse is triggered 10. At the output of the OR circuit 8 is a single voltage level. In the case of the presence of opaque elements on the surface of the light guide 3, a pulse train with a low tracking frequency equal to the scanning frequency appears at the output of the OR 8 circuit. These {pulses are sent for further processing. 1 il. (L

Description

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The invention relates to automation and measurement technology and can be used in the rolling industry.

The aim of the invention is to extend the functionality by providing information about possible measurement errors caused by contamination of the light diodes with foreign non-transparent objects,

The drawing shows a functional daonal circuit diagram of the device.

The device contains a light source 1, a rotating mirror 2, light guides 3 and 4, photodetectors 5 and 6, a meter of 7 time intervals, an OR 8 circuit 1K-flip-flops 9-12 with an internal delay.

The device works as follows

The light beam of the light source 1 reflected by the rotating mirror 2 is scanned across the measured article 13 at a constant angular velocity. As the beam passes, the B light guide 3 hits, while the photodetector 5 forms a pulse. At the moment of intersection of the opaque article 13 by the beam of light, the pulse front edge of the photodetector 5 is formed. After passing the opaque article 13, the light beam hits the light guide 4, and through it the photoreceiver 6. from the photodetector 6, the time interval meter 7 measures the time interval between the falling edge of the pulse from the photodetector 5 and the leading edge of the pulse from the photoreceiver 6, since the light beam is scanned with a constant angular velocity The length of this interval is determined by the width of the rolled products.

When a beam of light passes through the surface of an opaque foreign object during the scanning of the beam through the fiber, the stream of light reaching the photoreceiver is interrupted and zero voltage appears at its output. Thus, during the movement of the light beam through the fiber, a group of pulses appears at the output of the photodetector, depending on the number of contaminating objects, but not less than two.

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When an extraneous opaque object contaminated the light guide 3, the pulse from the output of the photodetector 6 during the previous measurement cycle sets the triggers 9 and 10 to the zero state. At the output of the trigger 10, the voltage level is zero, the current pulse, from the photodetector 5, sets the triggers 11 and 12 to the zero state. Since both inputs of the OR circuit are logic O, O also appears at the output. At the output of the photodetector 3, at least two pulses appear during one measurement cycle. Ate-: the end of the first impulse in one hour; the last state is the trigger 9., and the BTOpiiM impulse is the trigger 10.

At the output of an IS1 circuit, a single voltage level appears.

When more than two pulses are received from the photodetector 5 during one measurement cycle, the trigger 9-12 does not change its state, and a single level of voltage is maintained at the output of the OR circuit. The pulse from the output of the photodetector 65, which comes after the pulses from the photodetector 5, again resets the triggers 9 and -O to the zero state, and the zero level appears again at the output of the OR circuit. Consequently, with Hajrac opaque elements on the surface of the light guide 3, a pulse train with a low tracking frequency equal to the scanning frequency appears at the output of the OR 8 circuit. These pulses are sent for further processing.

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If there are no 3 contaminations on the surface of the fiber during the cycle. Measurement at the output of the photodetector 5 appears only one voltage pulse. After its termination, trigger 9 is transferred to the unit state. After the pulse of the photodetector 5 a pulse of the photodetector 6 arrives. It appears at the moment the light beam hits the light guide 4 and resets the trigger 9 again to the zero state, the trigger 10 is always in the zero state. , and the output of the OR circuit appears logical O constantly, since the flip-flops 11 and 12 are constantly in the zero state due to pulse reset from the photodetector 5. Similarly, the device also works when the fiber is contaminated

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4, only the triggers 11 and 12 are transferred to one state only.

In the presence of contaminations of optical fibers 3 and 4, pulses appear at the output of the OR 8 circuit, but with a lower duty cycle than with the contamination of one of them.

The device provides information on the presence of contaminants of the optical fibers and the ability of the operator to automatically eliminate them and thereby eliminate errors in measurements caused by contamination of optical fibers by opaque objects.

Claims (1)

Invention Formula A device for controlling the dimensions of the product on a rolling mill, containing a light source and a rotating mirror, mounted on one side of the surface of the tested product, two light guides mounted on the other side of the surface of the tested product, two photodetectors five 0 77 five Q 5 n4 A cable connected to the corresponding optical fiber and a time interval meter, the first and second inputs connected to the outputs of the corresponding optical fiber, characterized in that, in order to expand its functionality, it is equipped with four 1K-triggers with internal delay and an OR circuit, the outputs of the first and the third 1K trigger is connected to the 1 inputs of the second and fourth 1K trigger, the output of the first photodetector is connected to input C and the first, C the second and R third and fourth trigger, the output of the second photodetector is connected to the inputs R of the first and second I and C of the third and C of the fourth flip-flops, the K-inputs of all the flip-flops are connected to the potential of logic zero, and the outputs of the second and fourth 1K-flip-flops are connected to two inputs of the WL circuit whose output is the device output.