Study On Mechanism Of Bionic Electroosmosis For The Pug Mill Resistance Reduction

In the production process of ceramic industry,vacuum mud scouring machine is a common equipment for mud treatment,which is used to extrude plastic mud section.In the process of mud mixing,kneading and extrusion,due to the structure and movement mechanism of the vacuum mud refiner itself,there will be adhesion resistance,resulting in uneven distribution of mud discharge speed,internal stratification,texture defects,increased energy consumption and other problems.These problems are the bottleneck restricting the quality improvement of ceramic products.The main reason for the mud defect is that the mud will adhere to the screw cutter and the inner wall of the cylinder during the extrusion process,which "drags" the mud movement,resulting in the slow movement of the mud near the contact surface,while the speed of the center part of the mud is fast,and the mud extrusion speed is uneven.In order to solve this problem and reduce the defects in the process of slurry extrusion,this paper proposes a method of biomimetic surface electroosmosis,which can reduce the adhesion and increase the slip velocity between the slurry and the contact wall.COMSOL software was used for simulation to compare the effect of mud on mud extrusion under different boundary wall conditions,the simulation results show that the slip boundary wall can improve the velocity distribution of slurry extrusion.Based on the influence of the mechanism of reducing viscosity and resistance by micro electro osmosis on the slip boundary conditions,an experimental detection device was set up to measure the influence of different parameters of electro osmosis on the adhesion of mud.The best scheme of electro osmosis on the surface of the body was determined by orthogonal test,and applied to the extruder head and the inner cylinder wall of the nozzle of TL-125 vacuum mud drill,so as to design a bionic micro electro osmosis The structure makes it have the characteristics of reducing viscosity and resistance of bionic body surface.The simulation results show that the central extrusion velocity of the mud section is reduced by 5.75% under the sliding boundary condition,and a certain velocity is obtained at the boundary,and the velocity gradient is reduced by 61.21% on average.After the improvement of the biomimetic surface electroosmosis,the tangential adhesion resistance between the extruder and the mud was reduced by 39.6%,the working power of the vacuum mud drill decreased by 11.23% on average,and the plasticity of the extruder increased by 23.56%.It improves the speed and stress distribution of ceramic clay in each part of the extruder section of the vacuum press,and reduces the original defects of clay such as layering,cracking and distortion.The results show that the biomimetic surface electroosmosis method is applied to the vacuum mud drill,and the performance of drag reduction is improved,the adhesion force between the mud and the cylinder wall is reduced,the energy loss is reduced,and the quality of the mud is improved,which provides reference for the design improvement of the vacuum mud drill.