Trucks used to transport concrete for construction; Because of its shape, it is often called a snail cart or olive cart. These trucks are equipped with cylindrical mixing drums to carry mixed concrete. During transportation, the mixing drum will always be kept rotating so that the concrete carried will not solidify. After the concrete is transported, the inside of the mixing drum is usually washed with water to prevent the residual concrete from hardening and occupying space, so that the volume of the mixing drum becomes smaller and smaller.
The concrete mixing truck is composed of a car chassis and a concrete mixing transport device. The chassis of concrete mixer trucks produced in China mostly adopts the Class II general chassis provided by the vehicle manufacturer. Its mechanism mainly includes power take-off, front and rear support of mixing drum, reducer, hydraulic system, mixing drum, mechanism, cleaning system, etc. The working principle is to take out the power of the car chassis through the power take-off device and drive the variable pump of the hydraulic system to convert the mechanical energy into hydraulic energy and transmit it to the quantitative motor. The motor drives the reducer, which drives the mixing device to mix the concrete.
The main vehicle engine power take-off mode is adopted. The function of the power take-off device is to take out the engine power through the power take-off switch, and drive the mixing drum through the hydraulic system. The mixing drum rotates in a positive direction during the feeding and transportation process to facilitate the feeding and mixing of concrete. It rotates in a reverse direction when discharging, and cuts off the power connection with the engine after the end of the work.
The mixing device is mainly composed of mixing drum and its auxiliary supporting parts. The mixing drum is the loading container for concrete. When rotating, the concrete moves along the spiral direction of the blade, and is mixed and stirred during the continuous lifting and turning process. In the process of feeding and transportation, the mixing drum rotates forward and the concrete moves inward along the blade. When discharging, the mixing drum reverses and the concrete is discharged outward along the blade.
The blade is the main part of the mixing device. Damage or serious wear will lead to uneven concrete mixing. In addition, if the blade angle is not designed properly, it will also cause segregation of the concrete, and the automatic loading mixer is 4 cubic meters