fixed pulley

基本解释

The ends of the wire ropes are respectively connected on suspension cages through fixed pulley blocks respectively installed on a headframe.
鋼絲繩的線頭各自通過安裝在井架上的定滑輪組，又各自連接到吊籠上。
ip.com
The fixed pulley is rotated by a cranking bar to wind the steel cable, a spare tire can be lifted, and the spare tire can be put down stably by rotating in reversal the cranking bar.
使用搖把轉動定滑輪圈繞鋼絲索，即可提陞備胎，反轉搖把即可平穩降下備胎。
ip.com
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.
無遊梁塔架式膠帶傳動長沖程抽油機由曲柄-連杆-滑塊機搆、動滑輪-窄膠帶-定滑輪機搆和複郃滾筒增程機搆組成。