通过对采煤机新型变升角螺旋滚筒极限转速的理论分析，确定了该种新型螺旋滚筒转速的合理范围。
The paper determines the rational range of a new spiral rotary drum's rotation speed through theoretically analyzing the critical speed of the drum in a coal machine.
提出一种计入弹簧大变形的影响的等升角圆锥螺旋弹簧非线性的螺旋弹簧理论。
Classic theory of conical helical spring is revised, and the analytic formula of nonlinear theory is derived.
提出一种计入弹簧大变形的影响的等升角圆锥螺旋弹簧非线性的螺旋弹簧理论。
Classic theory of conical helical spring is revised, and the analytic formula of nonlinear theory is derived.
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