内门扇采用锥角宽滑轮和独特的锁定构置，以及离合式传动执手配置，操作科学合理。
Doors used in a wide cone Angle and a unique locking pulley set structure, and the clutch drive handle configuration, operation of scientific and reasonable.
无游梁塔架式胶带传动长冲程抽油机由曲柄-连杆-滑块机构、动滑轮-窄胶带-定滑轮机构和复合滚筒增程机构组成。
The tower type belt driven long stroke pumping unit is composed of the crank-linkage-slide mechanism, movable pulley-narrow belt-fixed pulley mechanism and compound drum stroke-increment mechanism.
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