Pneumatic bow raising device and bow raising control method for tram

Abstract

The invention discloses a pneumatic pantograph lifting device for a tram and a pantograph lifting control method. The pneumatic pantograph lifting device comprises an oil-free air compressor, an air filter, a brushless direct current motor, an air cooler, an air-water separator, a pollution discharge electromagnetic valve, a heater, a one-way valve, an ATM dryer, an overflowing valve and a pressure switch. The air filter is arranged at the inlet end of the oil-free air compressor, and the brushless direct current motor supplies power to the oil-free air compressor. The outlet end of the oil-free air compressor is connected with an inlet of the air cooler, an outlet of the air cooler is connected with an inlet of the air-water separator, and the air-water separator is provided with the pollution discharge electromagnetic valve. The pollution discharge electromagnetic valve is provided with the heater, an outlet of the air-water separator is connected with an inlet of the ATM dryer through the one-way valve, and an outlet pipeline of the ATM dryer is connected with the overflowing valve and a pressure switch in sequence. The pressure switch and the brushless direct current motor are connected. According to the pneumatic pantograph lifting device for the tram and the pantograph lifting control method, the problems that pantograph lifting of the tram is frequent and the compresses air grade requirement is high can be effectively solved.

Description

technical field [0001] The invention relates to the field of rail vehicle braking system design, in particular to a pneumatic bow raising device and a bow raising control method for a tram. Background technique [0002] The existing subway bow raising device is used as a backup of the bow raising air source, and the normal bow raising is provided by the brake system air source. This bow raising device will only be used when the brake system air pressure is insufficient and the subway has no DC1500V high-voltage power supply. Therefore, the probability of using the bow-raising device is low. At the same time, the high-pressure flow of the subway is the full-line catenary. The pantograph is always in the state of receiving current from the lifting bow and the contact pressure of the lifting bow is fixed. The system is not equipped with a tight pressure regulating valve. The air quality requirements are not high. [0003] Generally, the bow raising device of subway projects is...

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Problems solved by technology

[0008] 2. The water and impurities in the bow raising device of the prior art are discharged through the electronically controlled blowdown valve. Since the water and impurities are mixed together, it is easy to cause the valve core of the blowdown valve to be stuck, and the continuous air leakage of the system leads to insufficient pressure in the air source system.

[0009] In addition, the frequent start-up of the air compressor in the tram also puts forward strict requirements on the dryer. Even if the bow raising device of the prior art uses a membrane dryer, the reliability of the membrane dryer will be greatly reduced under this operating condition. , The start-up pressure difference and flow difference caused by the frequent start-up of the air compressor make the membrane wire of the membrane dryer more likely to rupture and cause air leakage, reducing the reliability of the air source system

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