Design Principle And Performance Study Of Extrusion System Of High-torque And High Volumetric Ratio Twin-screw Extruder

Aimed at the latest generation co-rotating twin-screw extruder and basedon the development of high-torque and high volumetric ratio co-rotatingtwin-screw extruder, scale-up parametric optimization, design principle ofextrusion system, mixing performance of new type kneading blocks andexperimental study were studied.By combining FEM and orthogonal experiment design, the effects ofdifferent experimental factors i.e. channel depth, screw speed and theclearance between screw and barrel on evaluating indicators (output, specificenergy consumption, the maximum shear stress and mean residence time)were analyzed. The optimal geometry parameters of the target model, i.e. Ф72co-rotating twin-screw extruder were obtained.To study the design method of screw elements, the throughput, gearboxbearing load, specific energy consumption and residence time of screwelements, which were designed by normal uniform clearance correctionmethod and center distance correction method, were compared by finiteelement numerical simulation method. By combining finite element numerical simulation and traditional theorycalculation，the tooth profile optimization and structural design of involutespline spindle were carried out. Meanwhile, the bearing capacity of thespindle was analyzed from shear stress and transformation.Based on comprehensive analysis of the domestic and overseas existingheating and cooling methods and channels setting of the barrel, the electricheating and parallel tubing along the axis cooling method of the barrel waschosen in the subject. The structural design of the barrels in different functionsections were completed simultaneously.Adopting patent technology of our laboratory，new type pumping andreversed kneading blocks were designed. Furthermore, the mixing, transportand economic performances of the new type kneading blocks were studied bynumerical simulation method. Besides, the residence time distribution of thenew type kneading blocks was studied by digital image processing （DIP）andMATLAB software, and influence of the screw speed on the residence timedistribution was discussed.