overhead trolley conveyer

例句：

1. 1. The overhead crane conveyor is used to transport heavy loads from one location to another.
   头顶式起重机输送器用于将重物从一个地点运输到另一个地点。
2. 2. The overhead gantry conveyor is efficient in handling bulk materials.
   头顶式龙门输送机在处理大量物料时效率很高。
3. 3. The overhead belt conveyor is commonly used for the transportation of small packages.
   头顶式带式输送机常用于运输小包裹。