我国线路大修施工作业中,普遍使用大揭盖式道碴清筛机是在1963年开始的。由于原机械设计数据不足,机械结构不够完善、筛分效率低[注1],达不到线路大修要求的深度和洁度[注2],影响大修质量而缩短正常的大修周期,为此有些路局又返回人工清筛。而大揭盖清筛机还是有广泛的群众基础,然而继续使用大揭盖清筛机,解决不了大修的根本质量问 China’s line overhaul construction operations, the common use of large uncovering ballast cleaning machine was started in 1963. Due to insufficient mechanical design data, imperfect mechanical structure and low screening efficiency [1], the depth and cleanliness required for line overhaul are not reached [Note 2], the quality of overhaul is shortened and the normal overhaul period is shortened Road Bureau returned to manual screening. The big Jiegai cleaning machine or a broad mass base, however, continue to use the big Jiegai cleaning machine, can not solve the fundamental quality of overhaul