Common Sense of Turnout
(take ordinary single-open turnout as an example)
I. Basic composition: switch, connecting part, frog and rail
Professional word interpretation
Harmful space: a space between the narrowest of two wing tracks and the actual tip of the rutting center. (due to the existence of harmful space, when the locomotive and vehicle pass, the wheel rim may go wrong and cause derailment, so the wheel guard rail is set up to guide the train direction.)
II. Classification of turnout
1. According to the frog number of the turnout, divided into: 6, 9, 12, 18, 38
(at present, most of the major railway lines in China use four types of turnout, No. 9, 12, 18, 38, which allow lateral passage at speeds of 30 km / h, 45 km / h, 80 km / h / h, 140 km / h, respectively. The hump yard uses turnout 6.)
Divided according to the running direction of the train: opposite switch and forward switch
According to the structure: single-action turnout, double-action switch, cross-branch switch, compound cross-branch turnout.
