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.
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.
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.
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.
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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