Design And Experimental Research On The Screen Of Hammer Mill

Experimental study on the effect of screening by screening for new hammer millprinciple prototype of that: the screen as the main discharge equipment, in direct contactwith the screening material, its structure is reasonable or not directly affect the millscreening efficiency. The main subject of the mesh shape, arrangement and mesh sievethree different mounting angle grain size of the material sieve screening efficiency atdifferent structural parameters were studied.Firstly, the principle of the new screening mill works, the results of our previous workwere introduced, discussed the background and significance of hammer mill screeningefficiency studies and research on the current situation at home and abroad on thescreening efficiency Department and shortcomings supplemented explained.Second, the screening efficiency factor mesh structure parameters (mesh shape, screenangle and mesh installation arrangement) to determine the impact. On the basis of existingparticles through the sieve probability theory, analysis of the above general rule ofstructural parameters of each screen side effects of screening efficiency, and as a basis forthe mill sieve design and processing.Again to test screening efficiency indicators, the screen structure parameters affectingthe screening efficiency of the experimental study. To mill prototype structure parametersbased design and simulation through the screening device, and set up through the sievebench. The new screen application designed to simulate the experimental stage inscreening experiments. By examining the shape of the mesh, screen installation angle(screen angle), the sieve arrangement and flow velocity of the four factors on different sizematerials screening efficiency, and found levels of granularity for each particle screeningmill operating parameters and screen parameters of the mechanism. Experimental resultsshow that the particles of different sizes screening, air velocity and consistent influence ofscreen installation angle of screening efficiency, that with the increase of flow velocity,screening efficiency was first increased then decreased, and the particles The smaller the particle size, the more significant changes; greater impact on screening efficiency meshshape, and the screening of particles of different sizes, rectangular hole screen showed agood screening properties, hexagonal hole sieve than a square hole sieve high efficiency,minimum hole sieve screening efficiency; influence sieve screening efficiency of thearrangement is relatively small, compared to the arrangement of the U-shaped sieve, meshscreening effect is preferably arranged in a T-shaped sieve.Finally, the screening process in the hammer mill particle separation device wassimulated. First using3D modeling software PRO/E to establish a separate entity hammermill model device, and then import the fluid analysis software FLUENT in separate flowpaths within the flow field numerical simulation, flow field analysis of the results ofconvergence for FLUENT-EDEM simulation analysis provides flow model, and thenFLUENT-EDEM (airflow field-particle) coupling module level of each experimentalfactor grinder screening process simulation, the final simulation results were comparedwith experimental analysis we concluded. Comparative results show that the simulationresults agree with the experimental results, the relative error is less than4%. And as a basisto determine the best combination of screen structure parameters and airflow parameters.Choose different operating parameters for the hammer mill for grinding of different sizeparticles provide experimental and theoretical basis.