The concrete mixer truck consists of a special device for the car chassis and concrete mixing and transportation. The chassis of the concrete mixer truck produced in China mostly adopts the second-class universal chassis provided by the whole vehicle manufacturer. Its special mechanism mainly includes power take-off, front and rear brackets of the mixing drum, reducer, hydraulic system, mixing drum, operating mechanism, cleaning system and so on. The working principle: the power of the automobile chassis is taken out by the force taking device, and the variable pump of the hydraulic system is driven, the mechanical energy is converted into the hydraulic energy and transmitted to the quantitative motor, the motor drives the speed reducer, and the stirring device drives the stirring device to carry out the concrete, Stir.

1.1 power take-off device
The domestic concrete mixer truck adopts the main vehicle engine power take-off method. The function of the power take-off device is to take out the engine power by manipulating the power take-off switch, and drive the mixing drum through the hydraulic system. The stirring drum rotates forward during the feeding and transportation process to facilitate the feeding and stirring of the concrete. Reverse rotation, cutting off the power connection with the engine after the end of the work.
1.2 hydraulic system
The engine power taken out by the power take-off is converted into hydraulic energy (displacement and pressure), and then the motor output is mechanical energy (speed and torque) to power the mixing drum.
1.3 reducer
The speed of the motor output in the hydraulic system is decelerated and transmitted to the mixer drum.
1.4 operating mechanism
a. The direction of rotation of the mixing drum is controlled so that it rotates in the forward direction during feeding and transportation, and rotates in reverse when discharging.

b. Control the speed of the mixing drum

1.5 stirring device
It consists mainly of a mixing drum and its auxiliary support components. The mixing drum is a concrete loading container. It is made of high-quality wear-resistant steel sheet. In order to automatically load and unload concrete, the inner wall is welded with special-shaped spiral blades. The concrete moves in the direction of the spiral of the blade as it rotates and is mixed and agitated during constant lifting and turning. During the feeding and transportation process, the mixing drum rotates forward and the concrete moves inward along the blades. When discharging, the mixing drum reverses and the concrete is discharged outward along the blades. The rotation of the mixing drum is ensured by a hydraulic drive. The concrete mixer truck with a load of 3-6 cubic meters is generally driven by a car engine through a power output shaft to drive the hydraulic pump, and then the high-pressure oil pushes the hydraulic motor to drive the mixing drum. When the load is 9-12 cubic meters, it is driven by the vehicle-assisted diesel engine. The hydraulic pump drives the hydraulic motor. The blades are the main components in the agitator, and damage or severe wear can result in uneven mixing of the concrete. In addition, if the angle of the blade is not reasonable, it will cause the concrete to segregate.
1.6 cleaning system

The main function of the cleaning system is to clean the mixing drum and sometimes to dry the material during transportation. The cleaning system also cools the hydraulic system.