joint circular

According to the discovering problem in the coal machine test to design the measuring tool for special use to survey the degree of coaxial for the joint circular of inner gear and outword gear.

根据采煤机试验中发现的问题,设计了专门用来测量内齿节圆与外齿节圆同轴度的量具。

The Wheel PCD(Pitch Circle Diameter) is the diameter of the studs from the centre of the wheel.

常见的螺栓孔有四孔、五孔、六孔等分布模式,孔数与PCD值的乘积是轮毂的一项重要参数,本文旨在讨论用数字图像技术精确检测这些螺栓孔分布的几何数据,如孔心坐标x0,y0,节圆直径PCD,孔与孔之间的夹角θ,轮轴中心的坐标,以及各孔到轮轴中心的半径等等。