CS258720B1 - Wiring for sensing rail vehicles - Google Patents

Abstract

The connection for sensing the position of electrically controlled rail vehicles solves, in particular, their stopping in end or specified positions via an output relay sensing the reduced resistance of the circuit on a separate track zone. An input divider equipped with a comparison resistor connected to a reference voltage source and a sensing resistor connected from the track input terminal is included in the sensing circuit. The output of the input divider is connected to a flip-flop with hysteresis and from there via a transistor switch to the output relay controlling the vehicle drive.

Description

258720

BACKGROUND OF THE INVENTION The present invention relates to a wiring for sensing the position of rail carriages electrically overloaded and solves the problem of their reliable and fault-free stopping, particularly at the end or designated positions, excluding false signals outside the specified range.

For vehicles moving on the downhill with electric drive and, for example, skip lifts and electric cars, the over-travel of high-pass products with a limited track length is necessary to reduce their position in order to stop them automatically at a designated and, in particular, end cushion. This sensing and control is based on the principle of sensing the reduced insulation resistance between the branches of the skirted and stripped section of the collector with the in-line control relay to the circuit. This relay already reacts to 400 to 600 ohms when the line resistance decreases. -or only 5 to 20 ohms. As a consequence, there is a frequent failure of the control function in any partial bridging of the wheel branches, such as wet, cast or covered with gravel or iron with electrically conductive particles, even at high resistance, causing unwanted shutdown or blockage of the run. electric car by the appropriate direction.

The above-mentioned drawbacks are solved and the problem is solved by a circuit for sensing the position of the rail vehicles electrically controlled by sensing the reduced resistance from the wheel branches on a separate belt according to the invention. The essence of the invention is that an input divider is inserted into the sensing circuit, the comparative resistance of which is connected to the reference voltage source and the sensing resistor is connected from the input terminal of the track. The input divider output is through a hysteresis flip-flop and further through a transistor switch connected to the vehicle drive control output relay. The input resistor divider resistor and the input resistor selected therefrom are selected in such a ratio as to evaluate and give a control signal only to the extent of reducing the circuit resistance corresponding to the respective operating conditions of the conductive metal conduit transition, including consideration of any hard impurities on the collector by a maximum of 3 times, ie in the range of 255 to 70 ohms. The advantages of the invention are mainly due to the fact that the device according to the invention reacts to the set resistance during the passage of the vehicle and avoids undesired downtime or accident. An exemplary embodiment of the circuit according to the invention is illustrated in the accompanying drawing in the circuit diagram.

The input divider 20 consists of a comparing resistor 21 which is energized by a source of reference voltage 13 and a sensing element 22 in the order of the input terminal 31. The input 23 of the resistor divider 20 is connected to the input of the flip-flop 11 with at least 40 mV voltage, the output of flip-flop 11 is connected to the input of the transistor switch 12, the output of which is further connected to the output relay 13. the flip-flop 11 is powered from a reference voltage source 13 which is fed together with the output relay 15 from an o-ring source 14. The input terminals 31 and 32 are connected to the individual branches of the isolated track.

The principle of position sensing in connection with the invention is based on the evaluation of the voltage in the input divider 20 based on the relationship 21, 22 when the inputs 31a 32 are wound by the vehicle. This voltage is proportional to the track resistance and evaluates the flip-flop 11, which controls the output relay 15 via the transistor switch 12. The maximum resistance of the track to which the flip-flop 11 is given is: p max == (U0.21) - 22. (Uref-Uo) where R max - maximum resistances,

Uo - tilting tension of flip-flop 11, 21 - comparative resistance of input divider 20, 22 - sensing resistance of input divider 20.

Claims (1)

Wiring for sensing the position of electrically controlled rolling stock to stop it at the end or specified positions by means of the output resistance sensing output relay between the branch sensing terminals is on a separate track band, characterized in that an input divider (20) is embedded in the sensing circuit. the comparing resistor (21) is connected to the reference voltage source (13) and the sensing resistor (22) is connected to the first input of the RESTRAINING terminal (31) of the rail, while the output (23) of the input divider (20) is connected to the flip-flop 11) with hysteresis, the output of which is further connected via a transistor switch (12) to a vehicle drive control output relay (15), the transistor switch (12) being connected to a second rail input terminal (32) to which the power supply (14) is connected ) of the circuit supplying the reference voltage source (13) and the output relay (15).