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目前传动链精度测量仪,单独从机电部件精度来看,均已达到很高水平,但成套仪器的测置精度则远低于部件精度。其原因就在于联接此类量仪传感器测头的夹持固定方法存在严重问题,长期未得到理想的解决,因此成为提高此类量仪工作精度的一大障碍。本文首先研究了测头的结构和工作情况,从中找出如何保证精确工作的要求,得出联接夹持固定此类测头的合理方法应当充分满足:“一转动约束和五自由度”。以此检验过去国内外的几种夹持固定测头的联接机构,皆不同程度的不能满足此要求,这便造成过去此类量仪工作精度不高的关键。作者在研制CYC320传动链精度量仪工作中,首创了一个由四根钢丝构成的“一转动约束和五自由度”夹持固定联接机构,并且通过试验证明此机构具有:约束刚度高,随动偏转抗力小,工作精度高等特点,从而较理想地突破了此障碍,使此类量仪工作精度提高取得显著效果。同时,此种一转动约束和五自由度的联接机构,显然还是一种理想的传递精密运动的联轴节。
At present, the accuracy of the transmission chain measuring instrument, alone from the mechanical and electrical parts accuracy point of view, have reached a very high level, but the accuracy of complete sets of equipment is much lower than the part accuracy. The reason is that there is a serious problem in the method of holding and fixing the measuring probe of such a measuring instrument and has not been satisfactorily solved for a long time. Therefore, it becomes a major obstacle to improve the working precision of such a measuring instrument. In this paper, firstly, the structure and working conditions of the probe are studied. From this, we find out how to ensure the precise working requirements. It is concluded that a reasonable method of clamping and fixing such probes should be fully satisfied: “a rotation constraint and five degrees of freedom.” In order to test the past several domestic and foreign fixed-probe holding the connection mechanism, are not satisfied with the varying degrees of this requirement, which will result in the past, the key to the accuracy of such measuring instrument. The author in the development of CYC320 drive chain precision measuring instrument work, pioneered a four-wire consisting of a “rotation constraint and five degrees of freedom” clamping and fixed coupling mechanism, and proved by the experiment that this mechanism has: constraint stiffness, follow-up Deflection resistance is small, high precision and other characteristics, which is more ideal to break through this obstacle, so that such instruments to improve the accuracy of work achieved remarkable results. At the same time, such a rotation constraint and five degrees of freedom of the connection mechanism, obviously, is an ideal transmission precision motion coupling.