SU1060514A1 - Apparatus for braking electric locomotive - Google Patents

Abstract

DEVICE FOR ELECTRIC BRAKING, containing a dynamic braking control unit with its control unit, mechanical brake-. A block with its switch on and threshold elements, characterized in that, for the purpose of stopping accuracy behavior, it is equipped with an ILN-NOT logic unit, an electric locomotive speed sensor and sensor, connected by outputs through threshold elements with the corresponding inputs of an OR-NOT logic unit connected the output to the mechanical brake actuation unit, while the speed master is connected to the input of the control unit for dynamic braking.

Description

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The invention relates to the automatic retaliation of trains in railway transport, mainly mine, and is intended for the automatic control of the brakes of an electric locomotive during loading and unloading the train.

A device for braking an electric locomotive is known, comprising a dynamic braking activation unit with its control unit, a mechanical brake with its activation unit, and threshold elements 1.

A disadvantage of the known device is the impossibility of controlling the dynamic and mechanical load at low speed, which leads to inaccurate stopping of the car at the place of loading or unloading and loss of time for maneuvering. In addition, the inclusion of additional elements in the engine throttle circuit reduces drive power.

The purpose of the invention is to increase the accuracy of the stop.

This goal is achieved by the fact that a device for braking an electric locomotive, containing a dynamic braking control unit with its control unit, a mechanical brake with its switching unit and threshold elements, is equipped with an OR-NOT logic unit, a sensor and a unit for the speed of movement of an electric locomotive connected by outputs through thresholds elements with the corresponding inputs of the logical block OR NOT connected by the output to the block of the mechanical brake on, while the speed master is connected to the input of the control unit dyn ical braking.

Fig. 1 shows a block diagram of a device for braking an electric locomotive in Fig. 2 — graphs of the speed of the UV, dynamic VD and mechanical VD of braking forces when changing the setpoint of the ultrasonic speed sensor in the block sections {o1 | composition (b |.

The device contains an electric locomotive speed sensor 1 and an electric locomotive speed setting device 2, connected via threshold elements 3 and 4, made on zener diodes, with inputs of an OR-NOT 5 logic unit whose output is connected to an input of a mechanical brake block 7. A block is executed on electro-pneumatic valve on the motor stump. The speed setting device 2 is also connected to the input of the dynamic braking control unit 8, the output of which is connected to the input of the dynamic braking unit 9. The setpoint voltage of 2 speed is proportional to the value of the command speed. The voltage at the output of the threshold element 3 occurs if the speed of movement is above small. The direct output at element 4 is missing when the stop command from speed reference 2 sets. Block 8 control dynamic | their braking is activated in the mode of reducing the voltage of the setpoint 2 speed.

The device works as follows.

A decrease in the setpoint of the setpoint 2 speeds from a high speed command to a stop command when the train moves along the block section (Fig. 2a) activates the dynamic braking mode by block 8. At the same time, the output voltage of the threshold element 4 becomes; zero. As the speed decreases Motion UV dynamic braking efficiency Vd decreases.

- When the speed is lowered to a low V / W, the voltage at the output of the threshold element 3 also becomes zero, and at the output of logic unit 5 a voltage appears, which causes the mechanical brake 7 to turn on block b and stop the train.

When loading and unloading the train, the teams of low speed and stop alternate (Fig. 2 b /. The speed is not higher than low, so the voltage at the output of the threshold element 3 is always zero. At the stop command, the voltage at the output of the threshold element 4 also becomes equal to zero, which leads to the activation of the mechanical brake 7 by the block b and the exact stopping of the trolley at a given place. the voltage appears at the output of the threshold element 4, and the mechanical brake 7 is switched off by the unit b.

The advantage of the proposed device, as compared with the known, is the exact stopping of the trolley at a given loading or unloading point by switching on the mechanical brake of an electric locomotive at the moment of changing the low speed command to the stop command. This leads to an increase in the load of trolleys and a reduction in the loss of time for maneuvering the train. In addition, the introduced elements provide an automatic transition from dynamic to mechanical braking in case of failure of the transmitting and receiving devices at command speed.

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Claims (1)

DEVICE FOR BRAKING ’ELECTRIC locomotive, comprising a dynamic braking control unit with its control unit, a mechanical tor-. brain with a block! ” its inclusion and threshold elements, characterized in that, for the purpose of stopping accuracy behavior, it is equipped with a logic block! ” OR-HE, a sensor and a locomotive speed sensor, connected by outputs through threshold elements to the corresponding inputs of the OR-NOT logic unit, connected by an output to the mechanical brake enable unit, while the speed controller is connected to the input of the dynamic braking control unit. Fig. /