| Biomass energy is a renewable clean energy that can be one of the options instead of dwindling fossil energy. Biomass particles is extruded by biomass briquetting machine to form biomass fuel briquette with high density and high calorific value, making biomass energy used reasonably. But the problem of circular mould wear in briquetting machine seriously affects the life of the equipment, reduces productivity and increases the costs of equipment maintenance. Based on the analysis of work flow and wear mechanism of circular mould briquetting machine, a new wear resistant structure of circular mould is designed, which can extend service life.Characteristics, technical parameters, process and application status of three typical biomass briquetting machine are described systematically. The wear types of circular mould and influence factors of wear are discussed according to vertical circular mould briquetting machine. Based on the target of to extending the service life of circular mould, design idea of wear resistant circular mould structure is proposed.Combining with the working environment and extending the service life of circular mould biomass briquetting equipment, the paper puts forward three schemes that are embedded-block circular mould structure, synchronous gear and press roll circular mould structure and roller shaft circular mould structure. According to the important influence of selection of wear resistant materials on mould service life, three series of high/ultra-high manganese steel, low/medium/high carbon wear-resisting alloy steel and wear-resisting white iron are compared. Through comprehensive analysis, the roller shaft circular mould structure and wear-resistant material of the roller shaft are determined.Then, on the basis of the basic theory of elastoplastic, finite element of equation circular mould during briquetting process is used. The simulation analysis to extruded molding process of original circular mould structure and roller shaft circular mould structure are conducted respectively by using DEFORM-3D finite element analysis software. Obtaining the position of stress concentration of the two structures and rotation of the roller shaft, then tracking contrast of effective stress about the stress concentration position is conducted, and the wear rate and wear depth of the two structures are analysed. Further, simulated data shows the rationality of the roller shaft circular mould structure.Finally, a roller shaft circular mould experiment prototype is designed based on the three experimental objectives, and the correctness of the finite element analysis results are verified at last. To further study the service life of the roller shaft circular mould structure, experiment is carried out on 9JY-2000 type biomass briquetting machine, taking the wear amount of mass as evaluation indices, approximate values of service life of the two structures are calculated. The experiment demonstrates the practicality and effectiveness of roller shaft circular mould structure, the project objective is achieved. |
PDF Full Text Request