RU2778171C1 - Device for control of the density of attaching of wits to frame rails - Google Patents

Abstract

FIELD: switch drives control devices.

SUBSTANCE: invention relates to control devices for switch drives. The device for monitoring the tightness of the points against the frame rails contains a three-phase alternating voltage source, individual fuses for the phases of the alternating voltage, an alternating current switch motor, a neutral starting switch relay, a polarized switch start relay, transformer sensors, switch points, a switch position control relay, a control circuit transformer, a full-wave rectifier, a full-wave rectifier with current limiter, and a two-winding wag status monitoring relay. Transformer sensors with an open magnetic circuit are a U-shaped core on which two coils are installed. In this case, the electromotive force in the secondary winding of the transformer sensor is proportional to the square of the distance between the wit and the frame rail. The magnitude of the electromotive force in the secondary winding identifies the specified distance between the wit and the frame rail using a two-winding monitoring relay of the state of the wits.

EFFECT: increasing the reliability of the functioning of the control circuit of the state of the switch.

1 cl, 1 dwg

Description

The field of technology to which the invention belongs

The invention relates to the field of railway automation and telemechanics, in particular to control devices for electric switch drives in the electrical interlocking of switches and signals.

State of the art

A device for monitoring the fit of wits to frame rails is known, RF patent RU 2151706 C1. The disadvantage of this device is that it requires additional cable cores to ensure the operation of the device. In it, there are cases of false alarms when the rolling stock passes through the turnout section, in addition, due to the complex algorithm for processing the control signal, it contains a significant amount of equipment, which leads to a decrease in the reliability of the switch drive control device as a whole.

It is also known a device for monitoring the fit of the wits to the frame rails. “Five-wire control circuit for an alternating current switch drive”, Textbook for High Schools “Station Automation and Telemechanics Systems”, edited by Vl. V. Sapozhnikova - M .: Transport, 1997, p. 103 fig. 4.29.

The disadvantage of the known device lies in the fact that the control of the tightness of the blades is controlled indirectly, by extending the working ruler to a predetermined distance, providing the required tightness of the blades to the frame rails. Considering that the switch drive is mechanically fixed on the frame rails, such extension of the working ruler provides the necessary tightness of the sharp edges to the frame rails, which is indirectly recorded using the control rulers and contacts of the automatic switch of the electric switch drive.

The closest in technical essence to the claimed device is selected as a prototype "Five-wire control circuit of the AC switch drive" Textbook for Universities "Station automation and remote control systems" edited by Vl. V. Sapozhnikova - M .: Transport, 1997, p. 103 fig. 4.29.

The disadvantage of the prototype lies in the low reliability of information about the actual gap between the wit and the frame rail, in terms of broadening the track between the rails on the arrow, as well as possible misalignment of the rods that ensure the movement of the wits between the frame rails.

These circumstances necessitate frequent monitoring of the actual fit of the blades to the frame rails no more than 4 mm by the maintenance personnel of the railway transport, which leads to an increase in the cost of servicing the electric switch drive.

The technical result, to which this invention is directed, is to increase the reliability of the operation of the circuit for monitoring the state of the switch and to ensure the safety requirements for train traffic when using an electric switch drive, as well as to reduce the cost of its maintenance.

The technical result is achieved by the fact that the device for monitoring the tightness of the points against the frame rails contains transformer sensors with an open magnetic circuit, the primary windings of which are connected through the contacts of the auto switches, the contacts of the polarized starting relay arrows and the tee contacts of the neutral starting relay to the primary windings of the current transformers, and the secondary windings of the transformer sensors with an open magnetic circuit through the contacts of the autoswitch and through a full-wave rectifier are connected to one winding of a two-winding control relay for the state of the wisecracks, to the other winding of which a half-wave rectifier with a current limiter is connected, to the latter through the front contacts of the control relay for the status of the wisecracks, the contacts of the auto-switch and the contacts of the neutral starting relay arrows are connected winding of the arrow position control relay.

The compared analysis shows that these differences, stated in the device for monitoring the tightness of the wits to the frame rails, from the prototype represent a number of new features, which makes it possible to attribute them to the criterion of novelty.

In the patent scientific and technical literature, including RU 2667049 C1, RU 2539619 C2, RU 2549316 C2, RU 2272730 C2, RU 2579242 C2, RU 2261814 C1, RU 2700248 C1, RU 2153433C2, RU 2145560 C1, RU 26666666666666666666664899 C2, SU 2044444444444444444444444444444444444444444ARUST solutions with similar distinctive features were not found. In this regard, it is concluded that the claimed invention meets the criterion of significant differences.

Brief description of the drawing

In the drawing of FIG. 1 shows a diagram of the device.

The device contains:

three-phase alternating voltage source - 1,

individual fuses for AC voltage phases - 2, 3, 4, primary windings of current transformers - 5, 6, 7,

tee contacts of the neutral start relay of the arrow - 8.1, 8.2, front contact of the neutral start relay of the arrow - 9,

contacts of the polarized starting relay arrows - 10, 11, contacts of the automatic switch of the pointer electric drive - 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,

AC switch motor - 24,

transformer sensors with an open magnetic circuit - 25, 26,

primary windings of transformer sensors - 27, 28,

secondary windings of transformer sensors - 29, 30,

wits arrows -31,

travel box - 32,

full-wave rectifier - 33,

two-winding control relay of the state of the wits - 34,

front contacts of the control relay of the status of the wits - 34.1, 34.2,

current limiter - 35,

half-wave rectifier - 36,

arrow position control relay - 37,

adjusting resistor - 38,

blocking capacitor - 39,

control circuit transformer - 40,

control circuit AC source - 41

electrical centralization post - 42.

Implementation of the invention

The device for monitoring the tightness of the blades to the frame rails works as follows. When the arrow is transferred from one state to another, the contacts of the polarized starting relay 10, 11 are connected, as shown in the drawing of FIG. 1, then the tee contacts of the neutral starting relay 8.1, 8.2 and the front contact of the neutral starting relay 9 are closed, located at the electrical interlocking post 42, the AC turnout motor 24 is energized through the contacts of the automatic switch of the turnout electric drive 12, 16 from a three-phase alternating voltage source 1, simultaneously from source 1, voltage is supplied to the primary winding of the transformer sensor 28, this voltage is supplied through the closed contacts of the automatic switch of the pointer electric drive 16 and 22. In the secondary winding of the transformer sensor 30, the electromotive force (EMF) is not induced until the wits of the arrow 31 reach to the set position shown in Fig. 1. After the transfer of the arrow is completed, when the gap between the blades and the frame rail is less than or equal to 4 mm, an E.D.S. will be induced in the secondary winding of the transformer sensor 30. sufficient level, which will go to the full-wave rectifier 33, from the received E.D.S. the two-winding control relay of the state of the wits 34 located in the waybox 32 will work, which will switch the front contacts of the control relay of the status of the wits 34.1, 34.2 to the closed position. After that, the contacts of the automatic switch of the pointer drive 12, 16, 14, 18, 20, 22 will open and the contacts of the auto switch of the point drive 13, 15, 17, 19, 21, 23 will close, as a result of this, the tee contacts of the neutral starting relay 8.1, 8.2 and a half-wave rectifier 36 and a current limiter 35 will be connected to the relay for controlling the position of the arrow 37, through the contacts of the automatic switch of the pointer drive 13 and 17, as well as the closed front contacts of the control relay for the status of the wits 34.1, 34.2, as a result of this connection, the polarized armature of the relay 37 will fix the set position of the arrow .

Brief explanations of the elements of the device for monitoring the tightness of the sharp edges to the frame rails.

Transformer sensors with an open magnetic circuit are a U-shaped core on which two coils wound with wire are installed. The transformer sensor is installed under the rail head in such a way that the switch blades, when adjacent to the rails, in the corresponding position of the arrow, will close the magnetic flux in the U-shaped core. When the wit is removed from this transformer sensor, magnetic resistance is formed in the latter for the magnetic flux F. The value of the magnetic resistance of the magnetic circuit of the sensor is composed of the magnetic resistance of _steel R _m . the magnetic circuit has two tips.

Hence, the total magnetic resistance will depend on the tightness of the sharp edge to the frame rail and will be:

- суммарная длина средней магнитной силовой линии в стали сердечника, S_М - площадь поперечного сечения магнитопровода в зоне воздушного зазора,

- длина воздушного зазора

- соответственно значение магнитной проницаемости материала магнитопровода и воздуха.where:

- the total length of the average magnetic field line in the core steel, S _M - the cross-sectional area of the magnetic circuit in the air gap zone,

- air gap length

- respectively, the value of the magnetic permeability of the material of the magnetic circuit and air.

As a result of the fit of the wit to the frame rail, the inductance of the primary winding of the transformer sensor changes and, consequently, the current in the primary winding changes. For small gaps, the dependence of the inductance on the size of the air gap is non-linear. This leads to a change in the electromotive force of the E.D.S. in the secondary winding of the transformer sensor proportional to the square of the distance between the wit and the frame rail.

Thus, in terms of E.D.S. in the secondary winding, it is easy to identify the specified distance between the wit and the frame rail using a threshold device, which is used as a two-winding monitoring relay for the state of the wits.

The two-winding wag condition monitoring relay has the release delay required to hold the armature after actuation, which is required to connect to the pointer position control circuit after switching the contacts of the auto switch and switching the contacts of the neutral starting relay of the pointer. The second winding of relay 34 will receive the DC component of the current, as well as relay 37, due to the half-wave rectifier 36 and the current limiter 35. Thus, the pointer position control relay will receive power from the DC component of the current due to the half-wave rectifier 36 only if the gap between the wit and the frame rail does not exceed the specified limit.

Claims (1)

A device for monitoring the tightness of sharp edges against frame rails, containing a three-phase alternating voltage source, to which primary windings of the current transformers are connected through individual fuses of the alternating voltage phases, to which two tee contacts of the neutral starting relay arrows and one front contact of the same relay are connected on one side , and on the other hand, the contacts of the polarized starting relay, which are connected via a cable line to the contacts of the automatic switch of the pointer electric drive and the pointer AC motor, as well as a half-wave rectifier with a current limiter, the other tee contacts of the neutral starting relay are connected to the pointer position control relay, which is connected through a control resistor and a blocking capacitor to the control circuit transformer connected to the control circuit alternating current source, characterized in that it contains transformer sensors with an open circuit magnetic circuit, the primary windings of which are connected through the contacts of the autoswitch, the contacts of the polarized starting relay arrows and the tee contacts of the neutral starting relay to the primary windings of the current transformers, and the secondary windings of the transformer sensors with an open magnetic circuit through the contacts of the autoswitch and through a full-wave rectifier are connected to one winding of the two-winding status control relay wits, to the other winding of which a half-wave rectifier with a current limiter is connected, the winding of the arrow position control relay is connected to the latter through the front contacts of the control relay for the status of the wits, the contacts of the autoswitch and the contacts of the polarized start relay of the arrow and the contacts of the neutral start relay of the arrow.

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