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People seldom paid attention to the underlying workers. Hewers's helper can help coal workers flat the coal in boxcars through a green and efficient way.
Hewers's helper is an airbag in the bottom of a boxcar. When the coal are added to the expected amount by conveyor, the airbag can automatically deflate to flat the surface.
HUANG Yunlei ZHOU Xiang CHEN Xiaowei LU Nannan