SU114434A1 - Device for detecting metallic particles in tissue - Google Patents

Description

Known devices for detecting metal particles in fabric, made in the form of a sensor consisting of contact rollers locked by metal particles, or traveling wave lines located on both sides of the fabric, or an inductance coil included in the electronic circuit and a stamp with a driving electromagnet included by it for the mark on the fabric of the test, the location of the detected particle is not sufficiently effective in detecting small particles from a magnetic material.

In the described device for detecting metal particles from a magnetic material in the fabric, the noted drawback is eliminated by the fact that magnets placed across the fabric with windings connected via electronic transformers are used as a sensor.

The drawing shows a schematic diagram of the device.

The device is intended for servicing, for example, squeezing rolls in order to turn off their drive when particles of magnetic material are detected in the fabric, to prevent metal particles and marks on the fabric of the place where these particles are located, to facilitate their subsequent removal.

Transverse of the fabric / moved along arrow A to the squeeze rolls (not shown in the diagram) and guided by plates 2 and 5 of non-magnetic material, sensors are installed in the form of magnets 4 equipped with magnetic conductors 5 and 6, windings 7 connected via transformers 8 to electronic scheme Behind the magnets there is a stamp 9, covered with, for example, a blue one, connected by a rod 10 with the core II of the electromagnet J2 activated by an electronic circuit.

The poles of the magnetic cores 5 and 6 overlap each other, creating a continuous magnetic field through which the fabric passes.

The inputs of each transformer 8 can be connected in series, for example, the windings of five electromagnets.

No. 114434-2 -

The current pulse in the winding 7 of the magnet, which occurs when passing through the magnetic cores 5 and 5 enclosed in tissue / particles of magnetic material, through one of the transformers 8 enters the grid of one of the two double triodes 12, is amplified by them and from the anode load 13 of these triodes enters a two-stage voltage amplifier assembled on a double triode 14. From the anode load 15 of triode 14, an amplified pulse is applied to the input of a trigger assembled on a double triode 16.

A negative half-wave current pulse triggers a trigger, in the anode circuit of which a relay 17 is turned on.

When triggered, the relay 17 breaks its normally-closed contacts 18, de-energizing the magnetic starter circuit 19 (not shown), stopping the squeeze roll drive, and closes the contacts 20 of the circuit 21 of the electromagnet feeder 12, which sets the stamp and the the electromagnetic brake circuit of the pressing rolls (not shown in the diagram), as well as the power supply of the signal lamp 22.

The trigger has deep positive feedback taken from resistance 23, with the result that the current in relay 17 continues to exist for some time after the pulse disappears, which is necessary for the electromagnet to operate on the stamp and magnetic starters to turn off the drive of the rolls and activate their brakes and signal light. A positive feedback is fed to the input of the trigger through the capacitance 24, which after a certain period of time is charged through the resistance 25, after which the feedback is terminated, restoring the trigger to its original position.

The power supply of the electronic circuit is carried out through a transformer 26 with rectifying semiconductor diodes 27 and 28. The signal light 22 is turned on in the circuit.

The device proceeds as follows. With the passage of a material / material made of magnetic material, the magnetic field of the magnets 4 is changed, as a result of which a pulse is generated in the winding 7 of one of the magnets. This pulse is amplified by amplifiers on triodes 12 and 14 and triggers a trigger circuit on triode 16. The trigger circuit includes a relay 17, which by its contacts 18 de-energizes the supply circuit 19 of the magnetic actuator, deactivates the pressure rolls, and contacts 26 turns on the supply circuit 21 of another magnetic actuator including the brake of the pressing rolls and the electromagnet 12 of the stamp 9, marking the location of the particle made of magnetic material on the fabric, and also lights the signal lamp 22.

Subject invention

A device for detecting metal particles in a tissue, made in the form of a sensor for detecting particles, placed near the moving tissue and included in the electronic circuit, and an electronic circuit included a stamp with a driving electromagnet intended for the brand on the fabric of the spot of the detected particle, the purpose of more efficient detection of particles from a magnetic material, magnets placed across the fabric with windings connected via transformers into an electron are used as a sensor th circuit.