The protruding groove is suitable for coal mine transfer machine. The commonly used models are 630 , 730 , 764 , 800 , 830 and other models. The main plants are commonly Zhangjiakou coal machine, Northwest Benniu, Shandong mining machine, Zheng coal machine, etc. The convex groove is used to complete the angle change of the bridge section and the suspended section. The large circular arc design is adopted and the transition is smooth.