Composition and function of concrete mixer:

　　搅拌机构是由水平安置的双圆槽形拌筒与两根按相反方向转动的搅拌轴和其上安装的搅拌叶片组成的。搅拌叶片的作用半径是相互交叉的，叶片与轴中心会连成一定角度，并且前后上下都会错开一定的空间。所以当搅拌轴开始转动时，叶片一方面要带动着混合料在两个拌筒内轮番地作圆周运动，上下翻滚，同时还要在搅拌叶片相遇或重叠的部位，混合料在两轴之间的共域相互交换体位;另一方面推动混合料沿着搅拌轴方向，不断地从一个旋转平面向另一个旋转平面运动。

　　The mixing mechanism is composed of a horizontal double circular groove mixing drum, two mixing shafts rotating in the opposite direction and the mixing blades installed on it. The action radius of mixing blade is cross each other, the blade and the center of the shaft will form a certain angle, and the front and back up and down will stagger a certain space. Therefore, when the mixing shaft starts to rotate, on the one hand, the blades should drive the mixture to make circular motion and roll up and down in the two mixing drums. At the same time, at the place where the mixing blades meet or overlap, the mixture will exchange body positions in the common area between the two shafts; On the other hand, the mixture is pushed to move continuously from one rotating plane to another along the direction of mixing shaft.
               

　　取一运动的微小混凝土混合料作为一个运动单元，该单元在搅拌过程中有着复杂的运动形式。当搅拌叶片带动该单元由拌筒底部向上运动时，由于其处在重力作用下没有其他阻挡，混合料从由挤紧状态松脱出来产生分散抛落，如同自落搅拌过程;当搅拌叶片推动该单元向下运动时，由于拌筒内壁和附近物料的阻力，使混合料受到挤压力、摩擦力作用，既有大的流动，又有小范围的挤散和重新混合，如同强制搅拌过程。

　　A moving micro concrete mixture is taken as a moving unit, which has a complex movement form in the mixing process. When the mixing blade drives the unit to move upward from the bottom of the mixing drum, due to the gravity effect, there is no other barrier, and the mixture is loose from the squeezed state, resulting in scattered throwing, just like the self falling mixing process; When the mixing blade pushes the unit downward, due to the resistance of the inner wall of the mixing drum and the materials nearby, the mixture is subject to extrusion pressure and friction, which not only has a large flow, but also has a small range of extrusion and re mixing, just like the forced mixing process.