Research On Solid-liquid Extrusion Separation Technology And Equipment For High Viscosity Materials

The high-viscosity materials generally refer to materials with large dynamic viscosity values,while the high-viscosity materials can be defined as materials with high dehydration pressure in the solid-liquid separation field,such as ultra-high molecular weight polyisobutylene,cement,and the like.For high-viscosity materials,general dewatering equipment has poor dewatering performance,and even in the process of extrusion dehydration,equipment will fail.Therefore,this paper has studied the design and safety evaluation of high-viscosity material extrusion dewatering equipment.Its main work and achievements are as follows:(1)For the preliminary study of high-viscosity materials screw extrusion dehydration mechanism,respectively,high viscosity materials in the single and twin screw at different positions of the flow state,the establishment of the physical press model and its corresponding mathematical model.Taking simulated materials as the research object,the relationship between dehydration and pressure of high-viscosity material was studied through one-dimensional press dehydration experiment,and the type of high-viscosity material extrusion dewatering device was selected.(2)The extrusion characteristic curve of the thread element group is obtained by numerical simulation.Three different screw configurations were designed based on the design method based on the extrusion characteristic curve,the dewatering effect of each screw configuration was analyzed,and the influence of rotation speed on the distribution of the pressure and filling degree of the three screw configurations was studied,and finally the screw configuration was studied.The type is optimized for better extrusion and dehydration.(3)The finite element numerical calculation of the deformation,stress distribution and end contact gap of the barrels of different structural forms is performed,and the influence of different factors on the end surface clamping effect is analyzed.Then,the stress,deformation and torsion angles of the involute spline mandrel of the twin-screw extrusion and dewatering unit with high-torque material were numerically simulated by finite element method,and the number of teeth and modulus of the involute spline were further studied.(GB)The impact of the force,and finally the entire extrusion system for safety analysis and optimization.(4)In combination with engineering prototype experiments,analyze the possible faults in the dehydration process,establish a fault tree for the system,identify the factors that may cause the failure of the dehydrator and combine the simulation results to perform safety early warning.