SU873132A1 - Mechanism working member position pickup - Google Patents

Description

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The invention relates to devices for remotely controlling the position of the working bodies of mechanisms and can be used, ano, in particular, for controlling the position of the regulating organs in the apparatus of the petroleum and chemical industries.

There is a known sensor for the position of the operating element of the mechanism on magnetically controlled contacts, characterized by an increased reliability of operation, containing a CONSTANT magnet mounted on a controlled organ, a control relay, a magnetic control contact (MK) with a bias winding, the relay key, which specifies the control unit. The bias winding is connected through the control relay contacts napalLtrlllnr to its winding and creates when the latter is turned on, a stream directed opposite to the flow of a permanent magnet. At the same time, the MK, after a brief stay in the closed state, breaks out, and the control relay remains in the on state. When the magnet moves away from the control point, the MK closes again under the action of the bias coil floor, turns on the disconnecting relay and its break contact, through which

the circuit is powered, de-energizes the device. The MK in this device for the entire sensor operation cycle closes twice, when a permanent magnet approaches the monitoring point, the MK closes at the time of the control relay on, and when the magnet is withdrawn, it is closed for the switch-off relay, the detectable time of the master circuit.

10 The rest of the time of the MC is in the open state, which makes it possible to have a practically unlimited resource of the MC in the sensor.} However, the known device has such a significant disadvantage as the possibility of issuing a false signal when removing the permanent magnet from the zone of the MC triggering associated with the emergence of parasitic

20 self-oscillations of the movable sistek of open relay relays, in which the measles of the relay does not reach the core of the electromagnet of the relay. The closest to the proposed one

25 by technical essence is: a device in which an additional resistor is connected in series with the control relay winding, with a normally-closed contact of the opening relay connected in parallel, the normally open contact of which is connected in parallel with the control relay winding, and the connection point of one of the terminals MK and a normally open contact of the relay to {troll connected directly to the positive power source. Such an embodiment of the device makes it possible not to change the requirements for contact systems of existing relays, eliminate the possibility of spurious self-oscillations of the relay in the sensor circuit, and thereby eliminate the possibility of producing false information and increase the reliability of the sensor 2. However, this device has a decoupling time the long time required for the device to go into the off state does not allow for hysteresis-free operation (or a sufficiently small differential The stroke potential), which in a number of cases significantly limits the use of the device, especially at high speeds of movement of the controlled organ, when the signal about leaving the controlled organ from the control point comes with a long delay in relation to the active position of the controlled organ . The purpose of the invention is to increase the accuracy of the information provided. The goal is achieved by the fact that the worker is in the position sensor. A mechanism of a mechanism containing a permanent magnet mounted on the working organ, a magnetically controlled contact, disconnecting the relay, parallel to the winding of which a capacitor is connected, the first output of the magnetically controlled contact to the clock through the second separating diode. The second output of the magnetically controlled contact is connected via the closing contact of the control relay to the anode of the first diode, the cathode of which is connected to the cathode of the second diode, the minus of the capacitor and the other end of the winding of the opening relay is connected to the negative source of the power supply, a biasing unit, and the second output of the magnetic control the contact is connected to the power supply plus; the anode of the first diode is connected to the biasing unit; the other end of the biasing unit is connected to the minus of the power source (ani, the other end of the relay winding A resistor and the disconnecting contact of the disconnecting relay connected in parallel to it are connected by a minus power source, and through the closing contact of the opening relay to the cathode of the first diode, a transistor is inserted, the collector of which is connected to the first terminal of the magnetic contact, the emitter is connected to one output side of the disconnecting relay, and the base of the transistor through the input resistor is connected to the anode of the first diode. Such an embodiment of the device, while retaining all the advantages of the known devices, makes it possible to eliminate the effect of asking time s circuit at switch-off process Cheney device to a minimum to reduce the differential travel sensor and enhance the reliability of the information issued by them. The drawing shows a diagram of the proposed sensor. The device contains a magnetically controlled contact (MK) 1, a biasing unit 2, a permanent magnet 3, a control relay 4, a disconnecting relay 5, a transistor 6, a capacitor 7, switching contacts 8 and 9 of the disconnecting relay, a variable resistor 10, resistors 11 . and 12, Zener diode 13, separation diodes 14 and 15, normally open contact 16 of control relay 4, resistor 17 and bias winding 18. The device works as follows. When magnet 3 is moved to the control point, MK 1 closes, and the positive potential of the power source through MK 1 and isolation diode 14 goes to the control relay 4 winding, which is connected to the power supply minus through the disconnecting relay 9 and the control relay 4 it gets on self-blocking through its own contact 16 and diode 15. A current begins to flow through the bias winding 18, which creates a flow / directional opposite to the flow of the permanent magnet 3, as a result of which the windings and the magnet are compensated and MK 1 opens. Control relay 4 remains on, signaling the presence of a control organ at the control point. During the time that MK 1 is in the closed state, the tripping relay 5 does not turn on, since transistor 6 does not turn on during this time due to the long time in the base circuit of transistor 6, determined by the value of capacitor 7 and additional resistor 11. When you remove the magnet 3 from the control point breaks the flow compensation; s, and only the winding field starts to act on the MC, under the action of which the MC 1 closes, the transistor b opens and turns on the tripping relay 5, which, by switching its contacts 8 and 9, short-circuits Relay 4 control The latter is de-energized, opens its contact 16, and the circuit returns to its original state. Thus, the use of the proposed device makes it possible to reduce the dsRminimum of its travel differential (almost to the value determined by

Claims (1)

Claim The position sensor of the working body of the mechanism, containing a permanent magnet mounted on the working body, a magnetically controlled contact disconnecting a relay, a capacitor connected in parallel to the winding, the first output of the magnetically controlled contact through the second isolation diode 15 connected to the winding of the control relay, the second output of the magnetically controlled kqh contact connected via a make contact control relay with the anode of the first diode, the cathode of which is connected to the cathode of the second diode, minus the capacitor and the other end of the disconnect winding barely connected with a minus power source; magnetization unit, the second terminal of the magnetically controlled contact connected to the plus of the power source, the anode of the first diode connected to the magnetization block, the other end of the magnetization block connected to the minus of the power source, the other end of the coil of the monitoring relay through a resistor and a disconnecting contact of the disconnecting relay connected in parallel to it with the minus of the power source, and through the make contact of the disconnecting relay - with the cathode of the first diode, characterized in that, in order to increase the reliability of the generated information In this case, the transistor is inserted into it, the collector of which is connected to the first output of the magnetically controlled contact, the emitter is connected to one output of the trip relay winding, and the base of the transistor is connected through the introduced resistor to the anode of the first diode.