SU912579A1

SU912579A1 - Track sensor

Info

Publication number: SU912579A1
Application number: SU802951407A
Authority: SU
Inventors: Валерий Алексеевич Шишенков
Priority date: 1980-07-07
Filing date: 1980-07-07
Publication date: 1982-03-15

Description

(54) ПУТЁВОЙ ДАТЧИК (54) PASSAGE SENSOR

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Изобретение относитс к путевым датчикам и может быть использовано в качестве позиционного переключател в системах автоматизации и диспетчеризации внутришахтного рельсового транспорта, на рельсовом транспорте разрезов, углеобогатительных фабрик и в других отрасл х промышленности , где примен етс рельсовый транспорт .The invention relates to travel sensors and can be used as a position switch in automation systems and dispatching of intrashaft rail transport, on rail transport of cuts, coal preparation factories and in other industries where rail transport is used.

Известен путевой датчик, содержащий преобразователь, выполненный на транспорматоре , первична обмотка которого обра.зована с рабочей и компенсирующей секци ми и подключена к источнику питани переменного тока, а вторична - к входу усилител , выполненного на транзисторе, коллектор которого через диод подключен к точке соединени рабочей и компенсирующей секций первичной обмотки преобразовател , и приемник сигнала 1.A travel sensor is known that contains a converter made on a transformer, the primary winding of which is connected to the working and compensating sections and connected to an AC power source, and the secondary to the input of an amplifier made on a transistor whose collector is connected via a diode to the junction point working and compensating sections of the primary winding of the converter, and the signal receiver 1.

Цель изобретени - расширение области применени .The purpose of the invention is to expand the scope.

Цель достигаетс тем, что датчик снабжен резистором, включенным между рабочей и компенсирующей секци ми первичной обмотки дифференциально-трансформаторного преобразовател , и трансформатором сThe goal is achieved by the fact that the sensor is supplied with a resistor connected between the working and compensating sections of the primary winding of the differential transformer converter and the transformer with

сердечником, магнитна проницаемость которого не зависит от частоты, причем первична обмотка упом нутого трансформатора включена в цепь источника питани последовательно с первичной обмоткой преобразовател , а вторична подключена к приемнику сигналов.a core whose magnetic permeability does not depend on the frequency, the primary winding of said transformer is connected to the power supply circuit in series with the primary winding of the converter, and the secondary winding is connected to the signal receiver.

На чертеже представлена принципиальна схема предлагаемого путевого датчика.The drawing shows a schematic diagram of the proposed track sensor.

Claims

The track sensor contains a differential transformer converter 1 with a working 2 and a compensating 3 sections in the primary winding and a secondary winding 4 connected to the input of the amplifier 5, made on transistor 6 with resistor 15 7 and 8 in the base circuit and diode 9 in the collector circuit. The anode of diode 9 is connected to the connection point of windings 2 and 3, between which resistor 10 is connected. In series with the primary winding of converter 1, an AC power supply 11 and a primary winding 12 of a transformer 13 are connected, the secondary winding 14 of which is connected to a signal receiver 15. The control object is the flange 16 of the vehicle wheel. The track sensor operates as follows. In the absence of a control object (wheel flange 16) in the working zone of the differential transformer converter 1, due to electromagnetic symmetry, transistor 6 is in the cut-off mode. Therefore, through the winding 12 of the transformer 13, the resistor 10, section 2 and 3 of the converter 1, an alternating current of the frequency of the supply source 11 flows, the value of which is determined mainly by the inductive resistance of sections 2 and 3 and the resistor 10. The voltage drop across the winding 12 is negligible, since its inductive impedance to the low frequency of the power supply is small. In addition, the value of inductance L of the winding 12, is proportional to the magnetic permeability of the core, is small, since the core of the transformer 13 is made, for example, air. Mutual inductance of M windings 12 and 14 due to its dependence on the magnetic permeability of the air core is also small. Therefore, the EMF of mutual induction, proportional to e M- at a low frequency of the power source, induced in the secondary winding 14 is insignificant, i.e. there is no signal at the input of the receiver 15. When the flange 16 of the wheel appears in the working area of the converter 1 (due to the resulting electromagnetic asymmetry in the winding 1), a differential EMF appears, which leads the transistor 6 from the cut-off mode to the amplification section. The collector-emitter junction resistance decreases and shunts the resistor 10 circuit and section 3, which causes an increase in current in the primary circuit and even greater system imbalance, and an increase in the differential EMF in the winding 4. The transistor 6 opens more through the resistor 7 and 8, causing an increase shunt effect collector-emitter junction. The characteristic of the transistor 6 is avalanched to the saturation section and the current increase in the primary circuit is stopped. The cessation of the current change in the primary circuit causes the appearance of a self-induced EMF supporting this current and an EMF in the winding 4, which locks the transistor 6, which again switches to the cut-off mode. Resistor 10 increases the range of relaxation current changes. The process is repeated many times until the cobalt unbalance of the electromagnetic system of the converter 1 due to the presence of the object being monitored. The relaxation oscillations of the current in the supply circuit cause the appearance of high-frequency emf in the primary winding 12 and the emf of mutual induction in the winding 14 of the air transformer 13. Due to the fact that the magnetic permeability of air does not decrease with increasing frequency (unlike ferromagnets), the di / dt magnitude of the relaxation oscillations of the current is large, then the EMF in the secondary winding 14 (Er M) is significant. The EMF of this winding as an information signal is fed to the input of the signal receiver 15. Using the proposed track sensor, instead of the coal-cutting sections of transformer pedals of the type DP50-80 that are now received on rail transport, or in the dispatching systems of the internal transport of sensors USV-1, it allows 2 times reduce the consumption of expensive scarce cable, especially when installing sensors in areas that are some kilometers away from the main trunk. The invention consists of a traveling sensor containing a converter made on a transformer, the primary winding of which is formed with working and compensating sections and connected to an AC power source, and the secondary - to the input of an amplifier made on a transistor, which collector through a diode connected to the junction point working and compensating section of the primary winding of the converter, and a signal receiver, characterized in that, in order to expand the field of application, it is equipped with a resistor connected between connecting the working section with the collector of the transistor and the compensating section of the primary winding of the transformer and converter, and an additional transformer with a core with a constant magnetic permeability, the primary winding of the said transformer being connected to the power source of the sequence-; with the primary winding of the converter transformer, and the secondary is connected to the signal receiver. Sources of information taken into account in the examination 1. USSR author's certificate No. 543827, cl. G 01 D 5/22, 06/15/73 (Prototype).