Making use of the points measured on the drum helical curve of concrete-mixer truck, the helical Angle formula of the helical curve is obtained by means of least square method.
利用测得的混凝土搅拌车拌桶螺旋线上的一组离散点，通过最小二乘法拟合出了求解拌桶螺旋线螺旋角的公式。
2
Concrete mixing and unloading mainly depends on the two spiral mixing leafs, so the design of the helical mixing blades about mixer truck is particularly important.