Design And Research Of Suspended Forest Small-biomass Pellet Fuel Forming Machine

Energy is the human society and the production practice, as the rapid development of social economy, rising on the demand for energy of human day by day and overusing of fossil energy result in the fierce competition for energy from the entire world, the increasing of the environmental pollution and environmental pressures. Facing the upcoming energy crisis, governments and scientists paid great attention to the development and utilization of biomass resources which is rich, reproducibility strong and can improve the environment and sustainable development. And biomass briquetting technology is one of the key techniques in reasonably using of biomass resource. So biomass briquetting technology has become the research focus, which showing broad application prospect.This article is from multiple forestry administration's need which is able to solve both compression molding and lower transportation cost, and get the northeast forestry university graduate thesis grant (gram09), aim at the forest tiny biomass (mainly small branches, twigs and leaves), according to the design task, on the analysis of the advantages and disadvantages of different kinds of molding machine, combine the forming equipment which the hole is 30mm with tractor, and design suspended forest small-biomass pellet fuel forming machine, in order to provide technical support for the rapidly developing forest industry.Learning form the research method of the ring-die's mechanical model, the paper develops and set up a mechanical model about flat-die. The analyses of the model find that the axial compressive stressσ(x), the radial compressive stress P(x) and the tangent friction force g(x) acting on the material change under exponential law along the length of die hole. Decay rate decreases and the process of saturation pressure prolongs while the friction coefficient f decreases and the radius of die hole r0 increases. And poison's ratioμis another important parameter which reflects longitudinal deformation and the lateral deformation of materials.The dislocation abrasion is caused by the speed difference between internal and external roller. The total wear effect is directly related with the difference which is the effective contact length of roller and the flat die in cylindrical roller flat forming machine. The shorter of the effective length, the lower the total wear effect. Always the total wear effect is directly related to the rotary speed of roller, the higher the rotary speed, the more obvious dislocation wear. So the effective contact length should be smaller in the condition that can ensure the rotary speed of roller in cylindrical roller flat forming machine.Based on the above analyses, according to the design task, based on the analysis of the advantages and disadvantages of different kinds briquetting machines, combining the structure characteristics of briquetting machines now, confirm the proper molding method, driving scheme and some main parameters, and design a movable biomass fuel briquetting machine which is in moderate yield, low energy consumption, high density of molding fuel and can hang in the rear of wheel tractors conveniently. Moreover, the design of mould can also reduce the cost effectively.Hanging bracket is the important support of the movable biomass fuel briquetting machine, and its carrying capacity is the key which decide the whole machine is in the normal operation or not. The static analyses with ANSYS to the hanging bracket find that the hanging bracket in work mainly happens bend and turn from inside to outside along the Z axis. The internal stress variation and displacement deformation of hanging bracket is more obvious. The research can provide reference for the optimization design of hanging bracket and improvement its life.