Method for preventing vehicle from being braked when constant pressure of 600kPa of freight train is converted into constant pressure of 500kPa

Abstract

The invention discloses a method for preventing a vehicle from being braked when a constant pressure of 600kPa of a freight train is converted into a constant pressure of 500kPa, which comprises the following steps of: in a constant pressure conversion process, implementing 170kPa maximum pressure reduction control twice, specifically, after implementing 170kPa maximum pressure reduction control for the first time under the constant pressure of 600kPa of the freight train, carrying out constant pressure air charging again; and when the train tail air pressure reaches 530 kPa or above and the train pipe air pressure does not exceed 580 kPa, 170 kPa maximum pressure reduction amount control is implemented for the second time, the constant pressure of the freight train is converted into 500 kPa constant pressure from 600 kPa constant pressure, and at the moment, the train pipe pressure inflated by the 500 kPa constant pressure locomotive and the maximum pressure of auxiliary air cylindersof all vehicles form a normal relieving pressure difference. According to the method, the problem of vehicle band-type brake caused by constant pressure conversion is solved by optimizing driver operation in the constant pressure conversion process, the effect of reducing the pressure of the auxiliary air cylinder of the vehicle at the constant pressure of 600 kPa is remarkable, and hardware transformation does not need to be conducted on locomotives and vehicles of an existing cargo train.

Description

technical field [0001] The invention belongs to the technical field of railway vehicles, and in particular relates to a method for preventing vehicle brakes when the constant pressure of 600kPa of a freight train changes to that of 500kPa. Background technique [0002] For decades, the supervisory constant pressure of my country's railway freight trains has been the coexistence of two train supervisory pressures of 500kPa and 600kPa. At the intersection of railway bureaus where the constant pressure of the train supervisor is inconsistent and there is a locomotive change operation, it is necessary to change the constant pressure of the train supervisor. In response to this problem, in Note 3 of Table 20 of the "Railway Technical Management Regulations (Common-speed Railway Part)" (TG / 01-2014) issued and implemented in 2014, "In case of locomotive change, the supervisor pressure of the automatic brake shall be When changing from 600kPa to 500kPa, the train supervisor should ...

AI Technical Summary

Problems solved by technology

For the 120 type freight car brake, the root cause of poor relief is that the train pipe of the 120 main valve is difficult to form a relief pressure difference to the auxiliary air cylinder, so that the main piston cannot drive the slide valve down to the inflation relief position