SU1247805A2 - Device for detecting metal particles in flow of raw mateial - Google Patents

Abstract

The invention relates to a measuring and control technique, in particular, devices for detecting metallic objects and particles in a stream of technological raw materials. The purpose of the invention is to expand the functionality of the device by determining the location of metal objects across the width of the conveyor belt. This is achieved by the fact that at least two channels are additionally introduced into the device, each of which includes series-connected delay elements, a form driver, an AND circuit, and an actuator. In this case, the inputs of the delay elements of all channels are connected to the output of the amplifier, corresponding to its middle section of the induction sensor; the second inputs of the And circuits are connected to the output of the amplifier corresponding to the last sensor section in the direction of movement of the conveyor belt, and the third inputs of the And circuits to the output of the signal processing unit. 1 il. S (L 1ЧЭ 4 1 OS for sd NJ

Description

The invention relates to a detection technique, in particular, to devices for detecting metallic objects and particles in a stream of technological raw materials, and can be used, for example, to protect the technological equipment of fuel supply paths of thermal power plants from damage by dangerous metallic objects.

The purpose of the invention is to enhance the functionality by determining the location of metal particles across the width of the conveyor belt.

The drawing shows a block diagram of the proposed device.

The device contains induction date10

If there are signals from interference acting on one or at the same time on all sections of induction sensor 1 (for example, during shocks and vibrations, with strong impulse noise in the network), the appearance of the signal at the output of signal processing unit 9 is blocked.

The video signal from the output of the second amplifier 7 to the delay elements 11-1 and 11-2 is delayed, respectively, for a specified time equal to

II

TI -7 and T2 17

Morning

Delayed signals respectively

and 12-2, causing them to run. From the outputs of the formers 12-1 and 12-2 pulses of a duration equal to

12 gz-b2

/ Tr.

Ttl

Tick 1, made in the form of three sections 2, 3 5 is fed to the input of the formers 12-1 and 4, the inputs of which are connected to the generator 5, and the outputs - to the inputs of the corresponding amplifiers 6, 7 and 8. The outputs of the amplifiers 6, 7 and 8 are connected to the inputs of the signal processing unit 9, the output of which jn is connected to the indicator 10. The device contains at least two channels, each of which, respectively, includes serially connected delay elements 11-1 and 11-2, drivers 12-1.12-2 and etc., three-input circuits AND 25 13-1, 13-2, as well as actuators 14-1, 14-2 ..

fi,, 3 is the distance from the middle section 3 to the specified boundary of the zones of the last section 4.

Consider the operation of the device for the case of 30 additional channels.

arrive at the first inputs of the circuits And 13-1 and 13-2. The video signal from the output of the first amplifier 6, which occurs when a metal object passes through the first section 2 of the induction sensor 1, is fed to the second inputs of the circuits And 13-1 and 13-2. Depending on the location of the metal object across the width of the conveyor belt and in the presence of a permissive impulse, a signal appears at the output of one of the AND 13-1 or 13-2 circuits from the signal processing unit 9 and one of the actuators 14-1 or 14-2 operates that makes it possible to determine from the width of the conveyor belt the position of a metal object dangerous to the protected technological equipment.

The voltage from the generator 5 is supplied to the radiating coils of sections 2, 3, 4 of the induction sensor 1. In the presence of metal particles or objects passing through the field of radiating coils of sections 2, 3, 4, the emf of the useful signal is induced in the receiving coils, which is fed to the inputs of the corresponding amplifiers 6, 7 and 8, where the signal is amplified, the residual signal of the sensor is compensated, and the video pulses are detected and amplified, which are fed to the inputs of the signal processing unit 9 U. Simultaneously from the output of the first amplify b sig35

40

arrive at the first inputs of the circuits And 13-1 and 13-2. The video signal from the output of the first amplifier 6, which occurs when a metal object passes through the first section 2 of the induction sensor 1, is fed to the second inputs of the circuits And 13-1 and 13-2. Depending on the location of the metal object across the width of the conveyor belt and in the presence of a permissive impulse, a signal appears at the output of one of the AND 13-1 or 13-2 circuits from the signal processing unit 9 and one of the actuators 14-1 or 14-2 operates that makes it possible to determine from the width of the conveyor belt the position of a metal object dangerous to the protected technological equipment.

Claims (2)

Invention Formula A device for detecting metal particles in a stream of raw materials according to ed. St. No. 949599, characterized in that, in order to expand the functionality by determining the location of metal particles along the width of the conveyor channels, go to the second inputs of the AND 45 tapes, it contains channels with the number 13-1, 13-2, and from the output of the second amplifier 7 - to the inputs of the delay elements 11 - 1, 11-2. Metal detection is signaled by a pulse at the output of the signal processing unit 9, which occurs when there are useful signals in at least two sections of the induction sensor 1, when the inputs of the signal processing unit 9 from the outputs of the corresponding amplifiers 6, 7, 8 50 at least two, each of which includes series-connected delay elements and a driver, the output of which is connected to the first input of the circuit I, the output of which is connected to the input of the actuator, while on all channels the inputs of the delay elements are connected to the output of the amplifier corresponding to the middle section of the induction sensor , the second inputs of the circuits And are connected to the output of the amplifier. at least two signals arrive, shifted by the corresponding last one in the direction relative to each other for a time proportional to the speed of movement of the metal object in the flow of raw material Vip. movements of the conveyor belt of the sensor section, and the third inputs of the AND circuits - with the output of the signal processing unit. If there are signals from interference acting on one or at the same time on all sections of induction sensor 1 (for example, during shocks and vibrations, with strong impulse noise in the network), the appearance of the signal at the output of signal processing unit 9 is blocked. The video signal from the output of the second amplifier 7 to the delay elements 11-1 and 11-2 is delayed, respectively, for a specified time equal to II TI -7 and T2 17 Morning Delayed signals respectively arrive at the input shapers 12-1 and 12-2, causing them to run. From the outputs of the formers 12-1 and 12-2 pulses of a duration equal to 12 gz-b2 / Tr. Ttl  arrive at the input shapers 12-1 arrive at the input shapers 12-1 arrive at the first inputs of the circuits And 13-1 and 13-2. The video signal from the output of the first amplifier 6, which occurs when a metal object passes through the first section 2 of the induction sensor 1, is fed to the second inputs of circuits I 13-1 and 13- 2. Depending on the location of the metal object across the width of the conveyor belt and in the presence of a permissive impulse, a signal appears at the output of one of the AND 13-1 or 13-2 circuits from the signal processing unit 9 and one of the actuators 14-1 or 14 operates -2, which makes it possible to determine from the width of the conveyor belt the position of a metal object dangerous to the protected technological equipment. Invention Formula A device for detecting metal particles in a stream of raw materials according to ed. St. No. 949599, characterized in that, in order to extend the functionality by determining the location of metal particles along the width of the conveyor belt, it contains channels at least two, each of which includes series-connected delay elements and a driver, the output of which is connected to the first input of the circuit I, the output of which is connected to the input of the actuator, while on all channels the inputs of the delay elements are connected to the output of the amplifier corresponding to the middle section of the induction sensor , the second inputs of the circuits And are connected to the output of the amplifier. movements of the conveyor belt of the sensor section, and the third inputs of the AND circuits - with the output of the signal processing unit.