A special truck used to transport concrete for construction; because of its shape, it is often called a snail truck. This type of truck is equipped with a cylindrical mixing drum to carry the mixed concrete. During transportation, the mixing drum will always be kept rotating to ensure that the carried concrete will not solidify. After the concrete is transported, the inside of the mixing drum is usually washed with water to prevent the hardened concrete from occupying space and make the volume of the mixing drum less and less.
The concrete mixer truck is composed of automobile chassis, mixing drum, transmission system, water supply device and other parts. Due to technical bottlenecks, the four major parts of domestic mixer trucks are all imported parts.
Mixer truck composition: second-class chassis, drive train, hydraulic system, frame, mixing tank, feeding and discharging device, water supply system, control system, human ladder and other parts. The front end of the mixing tank is connected with the reducer and installed on the front of the frame, and the back end is supported by two supporting wheels installed on the back of the frame through a raceway.
structure
The concrete mixer truck is composed of a car chassis and a special device for concrete mixing and transportation.
The chassis of concrete mixer trucks produced in my country mostly use the second-class general chassis provided by the vehicle manufacturers. Its dedicated mechanism mainly includes power take-off, front and rear supports of the mixing drum, reducer, hydraulic system, mixing drum, operating mechanism, cleaning system, etc. The working principle is that the power of the car chassis is taken out through the power take-off device, and the variable pump of the hydraulic system is driven, and the mechanical energy is converted into hydraulic energy and transmitted to the quantitative motor. The motor drives the reducer, and the reducer drives the mixing device to perform concrete Stir.
maintainance
Clean the concrete storage tank (mixing drum) and the inlet and outlet
Since concrete will solidify into a hard block in a short time and is corrosive to steel and paint, it is necessary for daily maintenance to wash the concrete adhering to the concrete storage tank and the inlet and outlet after each use of the concrete storage tank. Serious work.
These include:
a. Rinse the feed port with water before each filling to keep the feed port moist during filling;
b. Fill the washing water tank that comes with the car with water while loading materials;
c. Rinse the feed port after loading, and clean the remaining concrete near the feed port;
d. After unloading at the construction site, flush the discharge trough and add 30-40L of cleaning water to the concrete storage tank, and keep the concrete storage tank rotating at a slow speed when the vehicle returns;
e. Remember to drain the sewage in the concrete storage tank before loading the next time;
f. Thoroughly clean the concrete storage tank and around the material inlet and outlet at the end of the day to ensure that there is no cement and concrete agglomeration.
As long as these tasks are not carried out seriously once, they will bring great troubles to future work.
Maintenance drive
The function of the driving device is to drive the rotation of the concrete storage tank. It is composed of a power take-off, a cardan shaft, a hydraulic pump, a hydraulic motor, a control valve, a hydraulic oil tank and a cooling device. If this part stops working due to a malfunction, the concrete storage tank will not be able to rotate, which will cause the concrete in the vehicle to be scrapped, and even the whole tank of concrete will condense in the tank, causing the concrete mixer truck to be scrapped. Therefore, whether the driving device is reliable is an issue that must be paid attention to in use.
