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西德原使用螺旋分级机(图左)将砂浆从采场运往贮场。为了保护运输机不受损蚀,延长使用寿命,采用牌号为Du Pont“Adiprene”的尿烷(氨基甲酸乙脂)橡胶作叶片覆面层后(图右),螺旋运输机在10.7小时内可
West Germany originally used a spiral classifier (left) to transport the mortar from the stope to the storage yard. In order to protect the transporter from damage and to extend its service life, the urethane (U.R.) rubber grade DuPont “Adiprene” (right) is used as the blade cover. The screw conveyor can be used within 10.7 hours