定滑轮
dìng huá lún
- fixed pulley;crown block
定滑轮
定滑轮[dìng huá lún]
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它由定滑轮、滚动轮、轨道、弹簧、钢丝绳、壳体构成。
The utility model is composed of a crown block , rolling wheels , a track , a spring , wire ropes and a case .
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两个相同的定滑轮如下图示，开始时都处于静止，问哪个角速度大？
[ Example 2 ] Two identical crown blocks , as shown in the diagram below , start to rotate from rest . Determine whose angular acceleration is larger .
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使用摇把转动定滑轮圈绕钢丝索，即可提升备胎，反转摇把即可平稳降下备胎。
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 .