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1·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.

混凝土的搅拌和卸料主要取决于搅拌筒中的两条螺旋叶片，因此螺旋叶片的设计对搅拌运输车就显得格外重要。