Keith slip inside the cabin can take advantage of the gantry crane grab work quickly gathered spread the gap on the bottom of the tank grains, improve the efficiency of clearance. Before clearance job, grab the workers above the gantry crane, breathing the air of high dust content, some scattered material in the grab will glow, it is difficult to guarantee safety and health. Using case slip, in addition to the driver does not need to workers entering the cabin, guarantee the safety of the work. Cab can isolate dust hazard, all-weather standard air conditioning can create a comfortable working environment for the pilot, when operating mode when necessary, can also be optional primary filter, air exhaust catalytic converters, no spark muffler, etc.