The concrete mixer truck is composed of a special chassis for the vehicle chassis and concrete mixing and transportation. The chassis of the concrete mixer truck produced in China uses the second type of universal chassis provided by the vehicle manufacturer. Its specialized agencies mainly include power take-off devices, front and rear brackets for mixing drums, speed reducers, hydraulic systems, mixing drums, operating mechanisms, and cleaning systems. The working principle is that the power of the chassis of the vehicle is taken out through the power take-off device, and the variable pump of the hydraulic system is driven, the mechanical energy is converted into hydraulic energy and transmitted to the quantitative motor, the motor then drives the speed reducer, and the speed reducer drives the stirring device to perform the concrete Stir. 
According to the water content of the concrete transported by the concrete mixer truck, there are three types of mixer trucks: wet-type, dry-type and semi-dry-type. Most of the domestic use of wet concrete mixer truck, it can be shipped by the mixing plant (station) produced by the concrete or mixed according to the ratio of aggregate (sand, stones), cement and water, in the transport process, the wet material slowly Stir to prevent the concrete from condensing and segregating during transportation. However, the time from the production to the casting of the concrete should not exceed 1.5 hours, so as to avoid concrete condensation. Therefore, in the case of more long-distance transportation, it is necessary to use dry materials and semi-dry material mixer trucks to transport. The dry-type mixing truck can directly mix the dry aggregate and cement into the mixing drum of the truck according to the ratio. During the transportation, the dry material in the cylinder is stirred, and the vehicle will reach the construction site or add water at the construction site. Complete the mixing of concrete. The aggregates and cement in the concrete transported by the semi-dry mixing truck are also formulated according to the ratio and contain some water. However, the water content does not meet the casting requirements and needs to be reached at the construction site or at the construction site. Add water to stir .
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