Study On Molding Mechanism,Capacity,Energy Consumption And Wear Characteristics Of Biomass Circular Mould Briquetting Machine

Biomass circular mould briquetting machine is widely used in the fields of biomass curing molding,chemical machinery,feed production,energy and the others,however,there are several problems such as low production capacity,high energy consumption,serious equipment wear and short service life and the others.In this paper,theoretical research,experimental verification and finite element analysis of biomass circular mould briquetting machine from the aspects of capacity,energy consumption and abrasion are carried out to improve the production capacity,reduce the energy consumption,reduce wear and prolong service life.(1)Based on the forming principle and the force analysis of key components,the forming conditions were derived and the mechanical model of the anisotropic biomass circular mould briquetting machine in the whole extrusion molding process was established.The study found that the material grab angle is related to the friction coefficient between the material and the ring die and the roller,forming can be realized when the grab angle satisfies some conditions.Therefore,choosing the appropriate materials of the ring die and the roller can increase the grab amount of equipment and the production capacity when designing the circular mould briquetting machine.The extrusion pressure of the material in the through hole is exponential increasing from the outlet to the inlet,it has the same growth trend of the straight section in taper die hole,but on the cone is a power decreasing function.The ring die-roll extrusion process of material is divided into feed zone,extrusion zone and deformation compression zone,and the force of the material and the ring die in the three zones are different.(2)Capacity and energy consumption calculation model applicable to various structure isotropic biomass circular mould briquetting machine were deduced,and the rationality and generality of the model are verified by experimental data.Based on that,the influences of the various parameters on the performance of circular mould briquetting machine with taper die hole were analyzed.Analysis results show that the capacity increases with the increase of the circular mould width,linear velocity and the aperture ratio.The energy consumption is related to the material physical parameters and the equipment process parameters,on the premise that the materials can be smoothly extruded and stable forming,improving the material and the processing technology of circular mould and rollers,choosing podgy die hole with large cone angle can both reduce the energy consumption of the equipment.(3)Using the software ABAQUS to analyze the extrusion process,found that the stress of the material and the die hole are the largest at the transition between the cone and straight sections,The material is easy to produce the crack,resulting in serious wear and the die hole loses effectiveness.Improving the existing structure to solve the above problems,modularizing the circular mould and found that it not only can make the force of circular mould evenly,reduce the wear and extend the life cycle of the circular mould,but also can ensure the quality of molded products and make the surface more smooth.