Optimization Of Key Parts Of High Pressure Mounding Machine Of Lignite Quality Technology

The research and development of lignite quality technology is an important wayto solve the global shortage of coal resource. It is an urgently-depth study of subject ofthe global coal country. Using high pressure roller forming, the lignite of no binder forhigh-pressure molding process can make briquette have the characteristics of highcompressive strength, high drop strength, high coefficient of drum, less impurities,high compressive strength, better waterproof, longer transport distance and so on. It isthe future direction of development of the lignite quality technology.The article compares and analyzes no binder coal forming processes in differentcountries at this stage, and the lignite quality technology process of study used in thispaper is determined. The key link in the process of extrusion is taken as the mainresearch object.The working principle of high pressure roller forming machine used inthe process is analyzed in detail.The mathematical model of the pressing roll isestablished. The three-dimensional finite element model of the pressing roll is builtusing the finite element analysis software of ANSYS. Depending on the differentinterference fit, the contact analysis with roller and roller sleeve of the pressing roll ofinterference fit is done and the contact stress distribution is studied. Based on thedetermined interference fit, the strength analysis on the squeeze roll is done. Using thestructural optimization module of ANSYS and APDL parametric design language, theparameters of roller is optimized. The convective heat transfers between ligniteparticles and water vapor, lignite particles and high temperature smoke is calculated.The law of motion of water vapor between lignite particles in pit on surface of rollersleeve is analyzed using ANSYS FLOTRAN. Making use of thermal structuralanalysis, the process of extrusion molding is analyzed, and the temperature and stressdistribution is obtained.The results show the convenience, practicality and reliability of the contact analysis, strength analysis, and parametric optimization of the pressing roll using thefinite element method. The final optimal parameters are obtained: L3=0.198, R3=0.4,L4=1.05, R4=0.55, and the weight increases2.9%, the surface area of working shaftsegment increases5%. The purpose of increasing production is achieved. The flowdistribution of gas between lignite particles, the temperature and stress distribution oflignite by extrusion molding are got. This study provides the theory and data supportto improve the process of lignite quality and develop its key equipment of highpressure roller forming machine.