A new formula on the action sphere of reel slat is driven out through the graphical analysis of reel slat motion locus in this paper.
本文利用图解法分析了拨禾轮的运动轨迹，并推导出新的拨禾轮作用范围的公式。
Ball is a sphere with a circular channel for gate parts, ball rotation with the stem of the valve action to achieve headstock.
球阀原理，球阀是用带有圆形通道的球体作启闭件，球体随阀杆转动实现启闭动作的阀门。
Ball is a sphere with a circular channel for gate parts, ball rotation with the stem of the valve action to achieve headstock.
球阀原理，球阀是用带有圆形通道的球体作启闭件，球体随阀杆转动实现启闭动作的阀门。
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