高速取纸机构主凸轮廓线设计及其优化

Optimization Design of Main Cam Contour of High Speed Paper-picking Mechanism

为了得到适用于高速状态的取纸装置,提出一种双凸轮-平行四边形的组合机构。在分析高速取纸执行件空间姿态的基础上,以七次多项式和圆弧组合曲线为执行件运动规律,推导了主凸轮的工作廓线方程。以执行件角加速度为目标,以基圆半径和凸轮动程角为变量,对七次多项式进行优化。得到了一种适用于高速状态下取纸机构的主凸轮廓线的优化方法。计算表明,在约束范围内,适当增加基圆半径和凸轮动程角,能够明显改善双凸轮-平行四边形高速取纸机构的运动学性能。

In order to obtain a paper-picking device suitable for high-speed condition,a double cam-parallelogram combination mechanism was proposed.On the basis of analyzing the space attitude of the high-speed paper-taking actuator,the septic polynomial and the arc combination curve were used as the actuator motion law,and the working profile equation of the main cam was derived. The septic polynomial was optimized by taking the angular acceleration of the actuator as the target and using the base circle radius and the motion angle of the cam as variables. An optimization method suitable for the main cam contour of the paperpicking mechanism under high-speed state was obtained. The calculations show that within the constraint range,by appropriately increasing the base circle radius and the cam stroke angle,the kinematics performance of the double cam-parallelogram highspeed paper-picking mechanism can bed significantly improved.