The mixing drum and the supporting auxiliary parts constitute the mixing device. Mixing drum is an important working part of small concrete mixer, most of which are pear shaped structure. The shell of the mixing drum is a variable cross-section asymmetric double cone, which looks like pear. The diameter of the middle part is larger, and the two ends are butted with a pair of unequal length truncated cones. The front cone is short, and the end face is welded with a head; the back cone is longer and the end is open.

通过搅拌筒的轴线在前端面上安装着法兰，后段锥体上有一环形滚道，它焊接在垂直于搅拌筒轴线的平面圆周上。整个搅拌筒通过转轴和环形滚道，倾斜卧置在固定于副车架上的调心轴承和一对支承托轮所组成的三点支承结构上，所以搅拌筒能平稳地绕其轴线转动。搅拌筒的驱动动力来自于液压马达对转轴的驱动。

A flange is installed on the front end face through the central axis of the mixing drum, and there is an annular raceway on the back cone, which is welded on the plane circumference perpendicular to the axis of the mixing drum. Through the central shaft and annular raceway, the whole mixing drum is inclined and lying on the three-point supporting structure composed of the self-aligning bearing fixed on the subframe and a pair of supporting rollers, so the mixing drum can rotate smoothly around its axis. The driving power of mixing drum comes from the drive of hydraulic motor to the central shaft.

搅拌筒从筒口到筒内，沿内壁对称地焊接着2条带状的螺旋叶片，当小型自上料混凝土搅拌罐车搅拌筒转动时两条螺旋叶片被带动，作围绕搅拌筒轴线的螺旋运动，这是搅拌筒对混凝土进行搅拌或卸料的基本装置。搅拌筒内还装有为提高搅拌效率的搅拌板和扩展翅。

Two ribbon spiral blades are symmetrically welded along the inner wall of the mixing drum from the mouth to the inner wall. When the mixing drum of a small concrete mixer truck rotates, the two spiral blades are driven to make a spiral movement around the axis of the mixing drum. This is the basic device for mixing or discharging concrete by the mixing drum. The mixing drum is also equipped with a mixing plate and a spreading wing to improve the mixing efficiency.

在搅拌筒筒口处，沿2条螺旋叶片内边缘焊接着一个进料小锥，它将筒口以同心圆的形式分割为内外2部分，部分为进料口，混凝土由此装入搅拌筒内；进料小锥与筒壁形成的环形空间为出料口，卸料时，混凝土在叶片反向螺旋运动的推力下，从此流出。

A feeding cone is welded along the inner edge of the two spiral blades at the opening of the mixing drum. It divides the cylinder mouth into two parts in the form of concentric circles, and the central part is the feeding port, so the concrete is put into the mixing drum; the annular space formed by the feeding cone and the cylinder wall is the discharge port. When discharging, the concrete flows out under the thrust of the reverse spiral movement of the blade.

由上可见螺旋叶片的作用非常重要，小型自上料混凝土搅拌罐车工作过程中受到冲击力和磨损比较严重，破损会使混凝土搅拌的不均匀。另外，螺旋叶片的角度设计若不合理，也有可能使混凝土发生离析现象。

It can be seen from the above that the role of spiral blades is very important. The impact force and wear of small concrete mixer truck are relatively serious during the working process, and the damage will make the concrete mixing uneven. In addition, if the angle design of spiral blade is not reasonable, it may cause concrete segregation.

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