Thetrolley will be mainly used for separating piled material , so as for the robot to unstack. with a number of three -faces layouts, the mobiletrolly ‘s double elbows can deflect flexibly for the magnetic separation. it adapts to various anisotropic materials separation; with driving and chainS mechanism, the robot can move on the pre- laying rail , which facilitate the replacement of the buttress materials; the terminal detection sensors,make it possible for the robot to be directed automatically to serve another trolley and move the empty trolley out for loading and stacking.