(1), shock and vibration caused by fasteners loose and fall off, causing the coal falling pipe lining plate, guide plate falling.

(2), the material is mixed with foreign body, the foreign body is hard, has edges and corners, the coal tube jam packed.

(3) in the defect of the roller, the roller frame causes the scratch.

(4)The conveyor belt rack tangled after severe deviation.

(5), the cleaning machine is involved in the roller (return), the bolt is loose, and there is a sign of spring.