基于运动合成的旋转变速运动建模及其驱动机构演变  

Modeling of rotary variable motion and shedding driving mechanism based on motion synthesis

作　　者：袁汝旺[1,2] 李文豪 YUAN Ruwang;LI Wenhao(School of Mechanical Engineering,Tiangong University,Tianjin 300387,China;Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学机械工程学院,天津300387 [2]天津工业大学天津市现代机电装备重点实验室,天津300387

出　　处：《纺织学报》2024年第9期220-227,共8页Journal of Textile Research

基　　金：天津市自然科学基金项目(18JCYBJC20200);中国纺织工业联合会应用基础研究项目(J202003)。

摘　　要：为满足织机开口运动停—升—停的工艺特性及其动力学性能,提出一种基于运动合成的旋转变速运动规律构造方法。从组合机构角度提出旋转变速运动驱动机构及其演变,建立不同驱动机构的相对运动传递函数模型。采用目标优化法对旋转变速机构尺寸参数进行设计,在相同的中心距半径和转子臂初始位置的情况下建立优化函数并进行求解。仿真结果表明:偏移系数是影响旋转变速运动的关键参数,且变速运动静止时间、相对位移和速度峰值随偏移系数增加而减小;传递函数是影响旋转变速机构运动特性的重要参数,当偏移系数为0.4147时,随传动比的减小,转子臂相对位移减小,同时影响旋转变速机构凸轮特性,传动比大于0.9后不能满足旋转变速机构约束条件;用导杆滑块机构和铰接四杆机构对齿轮机构进行代换,可近似实现变速规律相对运动的传递,其传动误差分别为0.010、0.003 rad;通过减小中心距对铰接四杆机构重新优化可以提高旋转变速机构传动性能,满足高速运动需求。Objective In order to achieve and optimize the stop-rise-stop motion characteristics of heald frames to meet the shedding requirements,a variable speed motion model was established and different driving mechanisms adopted to achieve variable speed motion was analyzed.A systematic design method was proposed for the rotating variable speed mechanism with different configurations.Method Based on the principle of motion synthesis,a method of constructing the rules of movement of the heald frames was proposed.The model of rotating motion was accordingly established to analyze the characteristics of the shedding mechanism under different parameters.From the perspective of mechanism of combination,the rotating-variable-speed motion driving mechanism and its improvement were put forward.The relative motion transfer function models of different heald frame driving mechanisms were established,and the scale optimization was carried out using objective optimization.Results By comparing and analyzing the motion characteristics of the cycloidal function under different offset coefficients,changing the offset coefficients of the cycloidal function can meet the technological requirements of the loom at different rest times.The cycloidal rest time,relative displacement and velocity extremes decrease with the increase of the offset coefficient,and the acceleration is the least when the offset coefficient(b)is 0.1991.When the offset coefficient is 0.4147 and radius of roller(rc)is 31 mm,the kinematic characteristics of the fixed cam-gear rotating transmission mechanism with different gear ratios are analyzed.With the reduction of the transmission ratio,the rotor arm displacement,cam pressure angle and cam curvature also decrease.The dimensional design of the evolved mechanism is carried out by means of objective optimization method,and its motion characteristics are analyzed.When the offset coefficient is 0.4147 and the transmission ratio is lower than 0.9,the size of the hinged four-bar mechanism satisfying the constraint conditio

关 键 词：运动合成 旋转变速运动 驱动变速机构 偏移系数 目标优化 织机开口 

分 类 号：TS103.1[轻工技术与工程—纺织工程]