drag conveyor

例句：

1. 1.The drag conveyor is used to transport heavy materials over long distances.
   拖运机用于运输重材料跨越长距离。
2. 2.The traction conveyor was designed to improve the efficiency of the factory's production line.
   牵引输送机被设计来提高工厂生产线的效率。
3. 3. The pulley conveyor is a simple yet effective solution for moving bulk goods.
   滑轮输送系统是移动大宗货物简单而有效的解决方案。