指出每种绕带滚筒直径均对应一个最佳钢带厚度，不同直径的滚筒应卷绕厚度最佳的钢带，以获得最大的举液高度。
It is pointed out that each belt drum diameter is corresponding to an optimum belt thickness, and steel belt with optimum thickness should be coiled to obtain the maximum fluid lift.
由于卷绕构成弹簧的钢丝的直径沿钢丝的轴向改变，因此弹簧可以获得变刚度的特性曲线。
Because the diameter of the steel wire forming the spring by winding is changed along the axial direction of the steel wire, the spring can obtain a variable stiffness characteristic curve.
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