D型打结器夹绳盘-打结嘴空间角度参数分析

Parameter Analysis of Spatial Angle about Rope-cliping and Hook of D-knotter

D型打结器夹绳盘回转轴孔中心线与打结嘴回转轴孔中心线的空间角度参数是机架结构设计的基本设计参数,本文通过建立空间坐标系,对夹绳盘与打结嘴回转轴孔中心线之间的空间角度关系进行了表达。借助微分几何理论,建立了夹绳盘与打结嘴运动关系的数值解析条件,分析了k0轴与k1轴在i1o1k1平面的夹角α2、圆心o1与圆心o2在i1轴方向距离d5对送绳-搭绳动作的影响,得出当α2=8°、d5=54 mm时可实现可靠的送绳-搭绳动作;分析了j2轴与j1轴在j1o1k1平面的夹角α1、k0轴与k1轴在j1o1k1平面的夹角α3对绕扣-钳咬动作的影响,通过代入不同的α1、α3参数组合进行解析,得出当α1=10°、α3=25°时打结器可以实现可靠的绕扣-钳咬动作。基于解析的角度参数对打结器机架进行了试制,对装有试制机架的打结器与德国进口打结器(RS3770)同时开展空载打结试验,试验次数200次,试验结果显示捆绳在两个打结器上成结动作基本一致,两种打结器的成结率均为100%。可知本文解析的D型打结器夹绳盘和打结嘴的空间角度参数匹配合理。

The rotary shaft hole centerline of rope-clipping component and the rotary shaft hole centerline of knotter hook are basic design parameters in the D-knotter＇s structural design. By establishing space coordinate system,the space angular relationship of those two rotary shaft hole centerlines were described analytically. With the help of differential geometry theory,the numerical analysis conditions of the sport relations between rope-clipping component and knotter hook were established,the influences of related parameters,including k0,k1,α2 and d5 on the action of rope-sending and rope-towing were analyzed. The results showed that action of rope-sending and rope-towing would be successful when the values of α2 and d5 were 8°and 54 mm,respectively. The influences of related parameters,including j2,j1,α1 and α3 on the action of rope-winding and rope-biting were analyzed. The results showed that action of rope-winding and rope-biting would be successful when the values of α1 and α3 were 10° and 25°,respectively. Based on the analyzing angle parameter of the D-knotter,the physical model of each part of the D-knotter was obtained by machining. Then the forming performance test of the designed D-knotter and the D-knotter from Germany was carried out,totally 200 experiments were carried out to observe the effect of tying rope on the two kinds of D-knotter. The experimental results showed that the rope structure was basically the same from the two D-knotters,and the knotting rate of the two kinds of D-knotter was all 100%. The experimental results showed that spatial angle parameters of rope-clipping component and knotter hook were correct,and the analytical model was accurate and reliable. The model could be used for the parametric design of D-knotter.