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活节四边形是重要的机械灵敏元件之一,也是自动安平水准仪补偿器最常见的机械灵敏元件。活节四边形是由两根长度相等的金属细丝为一组的两组平行的等腰四边形结构系统,通常也称之为“吊丝”,图1是其最常见的形式。活节四边形上边为固定件固联于仪器的壳体之上,下边为活动件,其上装置光学补偿元件和阻尼器。由于这种结构系统的二组等腰四边形完全相同,此结构系统实质上是平面结构。
The hinged quadrilateral is one of the most important mechanically sensitive components and is the most common mechanically sensitive component of the automatic leveling compensator. A hinged quadrilateral is a system of two parallel sets of isosceles quadrilaterals consisting of two equal lengths of metal filaments, also commonly referred to as “slings,” and Figure 1 is its most common form. The upper part of the joint quadrilateral is fixedly attached to the housing of the instrument and the lower part is a movable part, on which an optical compensation element and a damper are mounted. Since the two isosceles quadrilaterals of this structural system are completely the same, this structural system is essentially a planar structure.