Turnouts are common railway accessories, but most people don't know what speed-up turnouts are. Here, what is speed-up turnout and the difference between speed-up turnout and non-speed-up turnout are introduced.

1 April 19971Rixin operation diagram was implemented, and the maximum allowable speed of railway lines in China was 120 km/h, so the maximum speed of turnouts on the main line was also120km/h. ..

In order to meet the needs of speed increase, a speed-increasing turnout with a maximum speed of 160 km/h was developed and produced. Speed-up turnouts are mainly 12 turnouts, and there are two kinds of * * *:

① Integral casting frog type;

② Movable middle rail type. Most of the pavements are movable rails, with a total length of 43.2m, the length of the switch rail is13.88m (for non-speed-increasing turnouts,1.3m), and the lateral speed of the turnouts is 50km/h. ..

The main difference between speed-increasing turnout and non-speed-increasing turnout lies in locking mode and locking device.

No-speed-increasing turnout adopts internal locking mode, that is, it is locked inside the switch machine.

Speed-increasing turnout: According to the relevant regulations, the externally locked speed-increasing turnout should be adopted in the sections with speed 120 km/h and above.

At present, there are two kinds of external locking devices: dovetail type and hook type.

In addition, the switch machine for speed-increasing turnout is usually a three-phase AC switch machine, and ZD6 series is not used for speed-increasing. However, there are also ZD6-E and J models that can speed up.

Question about turnout number: In fact, there are many frog numbers of speed-increasing turnout at present, the smallest is 12, and 18, 30, 38.