目前，我国铁路数十万辆货车中，装用GK制动系统的车辆占有相当大的比例。空车安全伐是GK制动系统中的重要部件之一。在运用中该安全伐无论在结构或是作用方面都存在着问题，分析这些问题对改进空车安全伐的结构性能是很有必要的。一、原型安全伐的作用特点：1、伐下部截面积山 At present, hundreds of thousands of trucks in China’s railway, equipped with GK brake system occupies a considerable proportion of vehicles. Empty truck safety cutting is one of the key components in the GK brake system. In the use of the safety of the cutting regardless of the structure or function of the existence of problems, analysis of these issues to improve the structural performance of empty truck safety is necessary. First, the role of prototype safe cutting features: 1, cut the lower section of the mountain