A method to calculate and counterbalance the inertia force of slider-crank mechanisms in high-speed presses

A new method to calculate and counterbalance the inertia force of slider-crank mechanisms in high-speed mechanical presses was put forward. By analyzing the kinematic characteristics of a center-located slider-crank mechanism whose crank rotates at a constant angular velocity, the kinematic parameters of the slide, connecting rod and crank were formulated approximately. On the basis of the results above, three inertia forces and the input moment in the mechanism during its idle running were investigated and formulated by dynamic analysis. A verification experiment was performed on a slider-crank mechanism at a high-speed press machine. The forces derived from the established formulas were compared respectively with those obtained by the ADAMS software and the classical method of connecting rod mass substitution. It was experimentally found that the proposed formulas have an improved performance over related earlier techniques. By use of these results, a 1000 kN 1250 rpm four-point high-speed press machine was designed and manufactured. The slide of this press is driven by four sets of slider-crank mechanisms with symmetrical layout and opposite rotation directions to counterbalance the horizontal inertia forces. Four eccentric counterbalance blocks were designed to counterbalance the vertical force after their mass and equivalent eccentric radius were formulated. The high-speed press machine designed by the proposed counterbalance method has worked with satisfactory performance and good dynamic balance for more than four years in practical production.     

ADAMS在铁路赁物装载加固纵向惯性力值计算中的应用

根据实际装载加固方案冲击试验原理，应用ADAMS软件模拟冲击时的连挂过程，建立了装载加固冲击试验仿真计算模型。利用模型进行刚性加固工况下的纵向惯性力值计算，并通过与力值公式计算结果的比较，对模型进行检验。     

高货位堆垛叉车的稳定性计算及分析

高货位堆垛叉车属于平衡重式叉车,必须具有一定的稳定性,保证在不同工况下均具有抵抗倾覆的能力。在货物重力及惯性力的作用下,工作中的叉车易发生向前纵向的倾翻;转弯时,由于离心惯性力作用,易发生横向倾翻;在坡道上行驶转弯或全速带载行驶转弯时,发生其横向倾翻的危险性更大。所以,高货位堆垛叉车的纵向及横向稳定性计算更显重要。