SU364832A1 - DEVICE FOR AUTOMATIC DISASSEMBLY BY LENGTH OF ELECTRICAL WIRING PRODUCTS - Google Patents

Description

one

The invention relates to instrumentation technology and can be used in product inspection devices.

The known devices for measuring the length of moving articles, which allow examining products along the length, contain channels for the beginning and end of the product, including corresponding sensors, amplifiers and multivibrators, a coincidence circuit, a sorting mechanism, and a mechanism for moving articles through sensors.

The main drawbacks of such devices are the inadequate accuracy of screening contaminated products and the processing of signals, resulting in reduced control reliability.

In order to increase the accuracy and reliability of the control, the sensors of the proposed device are made of eddy current in the form of current and consistently measuring inductance coils connected in series, the distance between them is equal to the minimum allowable length of monitored products, and the device is equipped with a high-frequency generator supplying the sensors and connected in series between an amplifier and a one-shot in the channel of the beginning of the product and between the amplifier and the matching circuit in the channel of the end of the products by the detectors differential2

raiding chains and comparison schemes.

The drawing shows a diagram of the proposed device.

The device contains a high-frequency generator}, current inductors 2, 3 and 4, 5 and measuring inductors 6, 7 II 8, 9, respectively, the sensors of the beginning and end of the product 10, high-frequency amplifiers 11 W. 12, detectors 13 and 14, differentiating chains 15 and 16, comparison circuits 17 and 18, a single vibrator 19, a coincidence circuit 20, a sorting mechanism 21, a limit switch 22 and a mechanism for moving products through

sensors 23.

The device works as follows. The excitation coils 2 m 3 of the sensor of the beginning of the product and - and 5 sensors of the end of the product are connected in series and antiphase and powered from the high frequency generator 1. The receiving coils b and 7 of the sensor of the beginning of the product and S and P sensors of the end of the product are connected in series and compensated in this way what is the total voltage

on them equals zero (with accuracy of compensation). Such a sensor design provides for the formation of an electromagnetic field in a narrow zone between the inductors. In the normal measurement cycle, first

The edge of the product 10 passes through the sensor of the beginning of the product, on which the input voltage pulse appears on the receiving coils 6 tons 7, its duration is equal to the passage time of the edge creating the distance between the sensor inductors of the sensor. This pulse, whose shape due to the use of eddy current sensors, does not depend on the contamination of the ends with non-conductive materials, is fed to a selective high-frequency amplifier // loaded on an amplitude or phase-sensitive detector 13, from the output of which the detected voltage through a differentiating chain / 5 serves for the steepness of the pulse front, is fed to the comparison circuit J7, which is triggered by a voltage of a certain level and produces a short pulse. The impulse from the comparison circuit 17 is fed to the launch of the waiting one-shot 9, which produces a pulse with a duration of:

 BUT/

 V

where A / is the maximum tolerance on the length of the product;

1 / - the speed of movement of products through sensors.

From the one-shot, a pulse is applied to the coincidence circuit 20. When the end of the product 10 passes through the end sensor, an input voltage pulse appears on the receiving coils 8 and 9 and is applied to the selective amplifier 12 loaded on an amplitude or phase-sensitive detector 14, from which output The detected voltage across differentiating chain 16 is fed to a comparison circuit 18, which produces a short pulse. This impulse arrives at the coincidence circuit 20, which produces an impulse arriving at the sorting mechanism in the event that the pulses from the odouvibrator 19 and the comparison circuit 18 arrive simultaneously, which occurs if the length of the controlled products lies within the specified limits.

If the length of the products is less than the minimum allowable, then the impulse from the comparison circuit 18

comes to the joint scheme 20 earlier than the pulse from the one-shot 19. When the length of the products is longer than the maximum allowed, the pulse from the comparison circuit 18 comes to the coincidence circuit 20 after the end of the pulse with

one-shot 19.

The sorting mechanism, which in its initial state directs the scrap (not shown in the drawing) to the bunker, is triggered by a pulse coming from the comparison circuit, and sends good products (not shown in the drawing) to the bunker. The limit switch 22 returns the sorting mechanism 21 to the initial state when the product enters the hopper. The movement mechanism 23 ensures uniform movement of the products through the sensors.

Subject invention

Automatic screening device

along the length of electrically conductive products, containing channels of the beginning and end of the product, including sensors, amplifiers and a one-shot, a coincidence circuit, a sorting mechanism and a product transfer mechanism, characterized in that, in order to increase reliability, the sensors are eddy current; sequentially current and consistently measuring inductance coils, the distance between them is equal to the minimum allowable length of the monitored products, and the device is equipped with a high frequency generator, pi thawed sensors, connected in series between the amplifier and the single-oscillator

in the channel of the beginning of the product and between the amplifier and the coincidence circuit in the channel of the end of the product with detectors, differentiating chains and comparison circuits.

Nanal end i-

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