The railway braking system comprises a braking supply pump and a braking mechanism located in the track of a marshalling area, the invention is characterized in that the sequential valve, the reversing valve and the side pressure delay reversing valve are arranged sequentially between the braking supply pump and the braking mechanism, and the order valve includes a valve body with two pairs of valve holes in the upper and lower ends, and the central side is provided with an inlet and outlet. The valve body is provided with three pistons connected by a stem, Railway Brake System an elastic piece is arranged between the upper piston and the upper end of the valve body, in the initial state, the above two pistons make the middle two pairs of valve holes in the closed state; the reversing valve comprises a four-and three-valve body, and the valve body is provided with four pistons connected by a stem. Railway Brake System An elastic piece is arranged between the lower piston and the lower end of the valve body, or between the cap of the stem and the upper end of the valve body, in the initial state, the 1-bit valve hole is connected, the right 2-bit valve hole is positioned between the first and second pistons near the second piston position, the left 2 valve hole and the right 3 valve hole between the second and third pistons and the upper and lower staggered connectivity, The left 3 digits and the right 4-bit valve hole are connected between the third and fourth pistons and stagger up and down; the side-pressure delay reversing valve includes a valve body with about two inlet valve holes on the upper side and an oil valve hole on the lower side, Railway Brake System a valve stem with a piston in the middle of the valve body and a triggering mechanism on the outer end of the stem. ; The brake supply pump is communicated with the 2-bit valve hole of the sequential valve and the lower end of the oil inlet through the oil outlet valve. The upper end of the sequential valve is in and out of the oil port, the right 3 valve hole to connect the oil cylinder, the sequential valve left 1 valve hole and the left 2 position valve hole respectively to connect the reversing valve right 3 and the right 4 valve hole The right 1-bit valve hole and the right 2-bit valve hole of the reversing valve are respectively connected with the oil cylinder by the inlet valve and the oil check valve. Left 2-bit valve hole and left 3-bit valve hole respectively through the pipeline connection braking mechanism brake oil cylinder side cavity and the middle cavity, the left 1-bit valve hole through the oil-check valve and the double return oil branch to connect the side pressure delay the valve hole, The double return oil branch is respectively connected with the delay relief valve and one-way out valve.
Railway braking system as an important part of the train, Railway Brake System but also continue to achieve technological progress, from the past to the old valve to realize independent research and development, China has mastered a unique, relatively complete railway braking system. In recent years, China's train and railway braking system has made continuous progress in train and bus. As one of the key components of train operation control, the advanced level of railway braking system determines the advanced level of train manufacturing technology. However, Railway Brake System the manufacture and overhaul technology of railway train braking system in China still lags behind the world advanced level, and the analysis and discussion of train railway braking system is of great significance to promote the manufacture and overhaul of railway braking system in China.
In the design of railway braking system, it is necessary to fully consider the factors affecting the automatic control device of the vehicle and reduce the train damage caused by longitudinal impulse.
The leakage of railway braking system will also have a great influence on the braking performance and the operation of Train. The leakage of the railway braking system mainly affects the time of relieving and refilling, Railway Brake System the pressure gradient will appear before and after the train, the braking performance of the train's tail vehicle is reduced, the braking effect is slow, the braking distance is increased, and the leakage of the railway braking system is one of the causes of the malfunction. When the speed of the train, the higher the demand for the railway braking system, the more obvious the fault phenomenon, even the driver loses the control of the brake tube decompression, in addition, the brake pressure during the process of leakage, speaking when the power distribution uneven, Railway Brake System train longitudinal impulse intensified.
China's railway technology to braking distance compared with Europe, but shorter than the United States. The development of railway train braking system in China can refer to the advanced level of European countries, Railway Brake System and also pay attention to the research and development of bogies. The French Y37-type steering frame has been able to achieve the highest speed of $number. 8km/h, is currently the best level.