pc28开奖网站 pc www.ugmrf.com 道岔是一种使机车车辆从一股道转入另一股道的线路连接设备，通常在车站、编组站大量铺设。有了道岔，可以充分发挥线路的通过能力。即使是单线铁路，铺设道岔，修筑一段大于列车长度的叉线，就可以对开列车。
The train is composed of a set of tracks to the device of another set of orbits. Each group of switch by switch, frog, two guard rail and sleeper, a long handle to leverage a two movable track, the wheel rim in opening direction into the scheduled route.
Single switch of the main line, line by line to the left or to the right fork, also known as the left and right turnout turnout.
Double switch is in the shape of a Y, which is connected with the two track to both sides of the bifurcation.
Three turnout as "shape, and connecting the three tracks, two groups switch from two sets of mechanical manipulation of tongue.
Doubleslip switches like X shape, combination in fact equivalent to four single turnout and a diamond shaped cross. The above will double cross X shaped switch points and two points respectively below link, is the crossover. It not only can open more direction, and do not cover a large area, so often used in station. There is a cross cutting equipment, often called the use of the diamond crossing. It is composed of two groups of acute frog and two groups of obtuse frog, but no switch, so the track can not transfer line.
Turnout installation device fixed screw fastening, device without the old wound crack.各连接杆、外锁装置无旧伤裂纹，杆件无磨卡及锈蚀，销孔磨耗不大于1mm，绝缘良好。
Each connecting rod, the outer lock device without the old wound crack, rod without grinding card and pin hole corrosion, wear not more than 1mm, good insulation
An important part of the guard rail fixed frog of turnout, arranged on both sides of the fixed frog. Is the control wheel running direction, to prevent the harmful impact of frog space or climb the actual point of frog, the critical equipment to ensure traffic safety. In the movable point frog, a guard rail only general in the side, in order to prevent the side wear of rail.