Design and experiment of the biomass briquetting machine with honeycomb structure bionic ring-die

In response to the problems of low production efficiency and severe ring mold failure in traditional biomass particle forming machines. In this study, a biomimetic vertical ring mold biomass particle forming machine was proposed to deal with the issue based on a honeycomb ordered multi mold hole structure. The feature parameters of honeycomb individual geometric mold holes were extracted using image processing such as ultrafiltration operators, and the coordinates of the mold hole network were obtained; Meanwhile, a force model was constructed for the coupling effect of the ring mold, pressure roller, and material. The parameters of bionic ring die, die hole and press roller of particle molding machine are designed with material intake and extrusion pressure as design objectives. Eventually, the decision is to adopt a three pressure roller biomimetic ring mold structure, with an inner diameter of 550 mm, a thickness of 65 mm, a width of 150 mm, and a hole opening rate of 31.2%. Under the premise of ensuring productivity, the length of the feed cavity for the mold hole is 8mm, the side length of the regular hexagonal mold hole on the inner side of the ring mold is 6mm, and the thickness of the spacing between the connecting film holes is 1.5 mm. The prototype is made of corn straw with a particle size of 2-4 mm under greenhouse conditions, with a moisture content of 12% and a spindle speed of 100 r/min. According to the measurement standards of NY/T1881.7-2010 "Test Methods for Solid Biomass Formed Fuel", the particle density, bending strength, crushing resistance index, and specific energy consumption per ton of the prototype are measured. The results show that at the same rotational speed, the average energy consumption per ton of the prototype is 40.46 kW·h/t. The optimized biomimetic vertical ring mold biomass particle molding machine reduces the energy consumption by 10.08% compared to traditional ring mold molding. The particle fuel molding density was greater than or equal to 1.32 g/cm³, the deformation resistance pressure is 1.79 kN, the deformation resistance is increased by 40.9%, and the shattering resistance index is 99.4%. The study the indicators have reached the requirements of the standards and higher than that of traditional biomass pellet machine.