Measurement of the Dry Building Materials' Level in the Process of Their Transportation

摘要

The automatizaion of technologica processes nowadays is one of the most important trends of the technical progress. It should provide the objective quantity and quality control both of ready-made production and quality contorl both of ready-made production and half-finished products at separate stages of the productioncycle. The quantity control, as a rule, is carried out by measurement of size or level of materials in reservoirs or moving containers, for example, at the coveyer or on the railway carriage platform. In addition, the material under control can be solid, dry, viscous or liquid. The most ocmplicated case is to determine the level of dry materials in movement. It is bound to following: a) dry materials when filled in and emptied out of reservoirs where they are kept or transported, do not have strictly horizontal external surface and form slopes i na result of friction and cohesion among granules; b) dry materials exert pressure to the bottom and walls of the reservoir, that is not proportional to the height of the level of loading, which excludes the application of Pascal's law under calculations; c) dry materials are humidity-sensitive (under the influence of humidity the known physical-chemical processes can transform them into the state close to the monolithic).