装岩是立并施工中劳动强度最大、占用时间最长的工序(约占掘进总循环时间的50～60％)。建国初期,我国只有苏联式的(斗容为0.11米~3)手工操作的半机械化小型抓岩机,生产能力低、操作笨重。到七十年代,我国有关厂矿和设计研究单位相继研制成功了各种类型的抓岩机,很有成效,如2HH-6型抓岩机,斗容为0.6米~3的双 Rock loading is the most labor-intensive and time-consuming process (about 50-60% of the total tunneling cycle time). In the early days of the founding of New China, only the Soviet-style semi-mechanized small grasping rock-grappling machine with a capacity of 0.11 m ~ 3 was used in our country, with low production capacity and heavy operation. To the seventies, China’s factories and mines and design research units have successfully developed various types of grabs, very successful, such as 2HH-6 grabs, bucket capacity of 0.6 m ~ 3 double