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1985年7月5日~8日由铁道部科技局和工务局主持在内蒙古乌海市对大揭盖式道碴清筛装置进行了技术鉴定。 大揭盖式道碴清筛装置是工务大修线路时,吊走旧轨排与铺上新轨排之间,用来清筛道床的大型机械。它原先是由各铁路局相互学习,参考了国外资料,自行发展起来的一种大型钱路作业机械。由于它能在有限的封锁时间内将换钢轨、换轨枕和清筛道碴
July 5, 1985 to 8, chaired by the Ministry of Railways Science and Technology Bureau and the Works Bureau in Wuhai, Inner Mongolia on the large uncovering ballast cleaning device for technical appraisal. Large uncovering ballast clean-up device is a line of public works overhaul, sling away the old track row and paved the new track row, used to clean the track bed of large machinery. It was originally a large-scale money road machinery developed by the railway administrations that learned from each other and made reference to foreign information. Due to its ability to change rails, sleepers and clear ballast for a limited period of blockade