含间隙织机四连杆打纬机构的虚拟样机仿真

Virtual prototype simulating of four-bar beating-up mechanism of loom with joint clearance

为研究织机四连杆打纬机构中牵手栓轴承间隙对打纬运动的影响,根据间隙副反力小于零即表明运动副元素间产生分离的原则,对牵手栓轴承内部的接触和碰撞进行预测。采用连续接触模型建立含间隙运动副,以无质量刚性杆代替运动副内间隙,在Solidworks中建立牵手栓轴承的虚拟样机分析模型,应用COSMOSMotion进行运动学和动力学仿真。对间隙杆的动力学分析发现,在曲柄运动的1个周期中,运动副内会产生若干次分离和接触。对筘座进行运动学分析发现,在高速状态下打纬机构的间隙使构件受到冲击力作用,对机构的打纬特性及织物质量会造成不良影响。

This study intends to research the influence of the joint clearance in connecting rod bin on beating-up motion.Based on the principle that the force in the bearing clearance is negative or zero means the pairing elements separate,the contact and collision in the bearing of the connecting rod bin is predicted.The kinetic pair with clearance is established by a continuous contact model,and the clearance between components is replaced by a rigid bar without mass.Virtual prototype model is established in Solidworks,and the kinematics and dynamics simulation is applied on it with COSMOSMotion.By analyzing the magnitude and direction of force loading on the clearance-bar,it is persuadable that the elements of the pair will separate and contact several times in a period of crank′s movement.Based on the kinetic analysis of the slay,it is noted that the components are affected by impact force under high speed conditions,which brings negative effect on the mechanism′s beating-up performance and fabric′s quality.