The principle of small concrete mixer is to drive the variable piston pump of the hydraulic transmission system by the chassis showing the driving force, transfer the mechanical kinetic energy into the hydraulic function to the quantitative analysis motor, and then push the mixing drum to rotate according to the reducer, so as to carry out the forced mixing of concrete, so that it is not easy to set in a special time. Because of the characteristics of the work, generally based on the length of the concrete transportation distance, the construction site standards and the provisions on the different conditions of concrete quality and preparation, two different working methods are generally adopted.
1. Mixing and transportation of ready mixed concrete. The concrete mixed in the mixing plant will be immediately transported into the mixer truck. During the transportation of small concrete mixer truck, the mixing drum will rotate at a speed ratio of 1-3r / min to continuously mix the concrete in the drum to prevent concrete segregation and ensure the quality of concrete. This kind of method is not suitable for long distance transportation of concrete. Generally, before the initial setting of concrete, the distance or time can be determined according to the concrete preparation, real-time road conditions, air temperature and other standards.
2. Mixing and transportation of concrete mixture. Generally, there are two kinds of conditions: granular material and water material mixing transportation. Granular material irrigation, mixing and transportation: in the mixing station, granular materials such as stone and concrete are added into the mixing drum according to the concrete preparation, and then the mixing tap water is added into the water storage tank in the truck, and the water is sprayed into the drum at an appropriate interval or time in the midway to carry out mixing for the concrete, or the mixing can be carried out after going to the construction site. Water material mixing and transportation: in the seasoning station, the mixing materials such as stone, concrete and water are separately put into the mixing drum according to the preparation, and the mixing drum rotates at the speed ratio of 8-12r / min in the middle of transportation to carry out mixing and mixing.
Compared with the above two methods, the former one can increase the transportation time or spacing of concrete. In a sense, the foundation of small concrete mixer replaces the effect of mixing station, which not only saves the investment of machinery and equipment project, but also improves the production efficiency. However, there are some problems in the quality of concrete, such as cohesiveness and symmetry, which are not as good as the concrete produced by mixing station. Therefore, in order to ensure the quality of concrete, considering the provisions of contemporary infrastructure construction, the first working mode has become the preferred working mode of small concrete mixer at this stage.
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