Critical emergency brake device for CRH train during rapid driving

The invention relates to a critical emergency brake device for a CRH (China Railway Highspeed) train used during rapid running. The device comprises a steel rail, a hydraulic pipe, hydraulic oil, a slope steel pipe, an inner steel pipe, a tension spring, a triangular hydraulic pipe, a circular triangular steel pipe, a fixed spring, a rigid clamping plate and a slope steel rail section. When an accident occurs at the front end of a vehicle, a driver instantly opens the hydraulic pump, the hydraulic oil pumped by the pump instantly pushes hydraulic oil in the full-hydraulic pipe, the vehicle completely flows at the same time, and when flowing, the hydraulic oil extrudes the two sides of the rigid clamping plate through the triangular hydraulic pipe to firmly clamp the steel rail, a wheel stops moving and the inertia impulsive force of the wheel is clamped; when the vehicle runs, the width of the steel rail at the lower end of the vehicle is 20 cm, the wall pressing area at the lower endof the wheel is 19/20, on