Theoretical justification of the roller press force parameters

摘要

Introduction. Despite being underused due to its low heat transfer, silt coal is an attractive thermal energy source. Silt coal is molded into briquettes by press machines, mostly roller presses marked by high reliability and relatively simple design, to increase heat transfer. The quality of the resulting briquette depends on the pressing force of the working elements. Research objective is to determine the relationship between the force parameters of the press and the physical and mechanical properties of the pressed material. Methods of research. The interaction between the rollers and the pressed material is analyzed in the deformation zone pressing area. A plane problem is solved considering the uniform distribution of material pressure across the roller generatrices. An elastic-visco-plastic rheological model is used to describe the stress-strain state of the pressed material. The model best reflects the behavior of an actual physical medium. Results. For the adopted rheological model, analytical dependencies between the pressure put on the pressed material and the press angle have been obtained for various stages of material deformation. An analytical relation between the pressing force, the moment of resistance to roller rotation, press design parameters, and the physical and mechanical properties of the pressed material has been determined. Conclusions. The obtained dependencies will contribute to a more conscious choice of the press power equipment that ensures roller compression and the drive of the required power to produce high-quality briquettes.