织机四连杆打纬机构对主墙板的动应力分析

摘要

织机的墙板具有尺寸大、结构复杂的特点,四连杆打纬机构的往复摆动使得墙板受到较大的冲击,是机器振动的主要来源.针对墙板上曲轴孔与摇轴孔承受的支撑力,建立相应的运动学和动力学公式.通过对2个固定孔相对位置的承载力计算和分析,结果显示,2个孔各自承受的作用力在不同的主轴转角下具有不同的数值和作用方向,并且在2个孔不同的安装角度下,墙板受到的冲击载荷也是变化的,当打纬角确定时,能够计算出不同安装角度下的最大总支撑力,选取最小值进行孔位设计就能取得墙板较好的振动和寿命要求.%The loom wallboard is characterized by big size and complicated structure, and the back and forth swinging operations of the four-bar linkage beating-up mechanisms make it withstand a great impact load from which originates the major vibration of the loom. Therefore, this paper established corresponding kinematics equations and dynamics equations for the supporting forces borne by crankshaft hole and rockshaft hole of the loom wallboard. The computation of the bearing stress of the two fixed holes at relative positions indicated the bearing stress had varied values and directions at different rotating angles of the shaft; and the impact load against the wallboard varied with the installation angle of the two holes. The total maximum supporting force value could be computed when the angle of beating-up is fixed. When designing the positions of the holes, the minimum value should be taken so as to gain lower vibration and longer working life.