Research On Screening Efficiency Of Spiral Screening Machine Based On EDEM

Shaking screen is the key equipment to separate granular materials according to particle size,which is widely used in mining,construction,agriculture,metallurgy,drilling and other industries.At present,the commonly used screening equipment still faces the problems of screening difficulties and wet materials easy to block when screening fine water-containing materials,which greatly affects the screening efficiency.The spiral screen machine studied in this paper can be a good solution to the problem of water-containing fine materials easy to produce mesh blockage.In order to study the principle of screw screening machine and reveal the factors affecting the screening efficiency of screw screening machine.Firstly,the model of spiral screening machine is established by Solid Works software,and it is imported into EDEM software.Then,the particle model of large and small particles is established in EDEM software.Finally,the movement process of particles in the spiral screening machine is simulated.After the completion of the simulation,through the data analysis and particles in the movement of the phenomenon,the analysis of the spiral screening machine screening machine principle.The effects of different arrangement of screw rod,rotational speed of screw rod,mesh size and water content between particles on screening efficiency were also discussed.The optimal parameters of coal particle screening were obtained.Finally,confirmatory experiments were carried out to verify the accuracy of simulation results.Through the above research shows that: the spiral rod arrangement order of the spiral screen machine has an important effect on the screening efficiency of particles,change the spiral rod arrangement order can change the movement trend of particles.The left screw rod group is placed on the left side of the screen surface of the spiral screening machine,and the right screw rod group is placed on the right side of the screen surface of the spiral screening machine in such an arrangement,the particles gradually move to both sides in the process of movement,so that the particles are relatively dispersed in the movement,so as to enhance the screening efficiency of the spiral screening machine.The size of the screen hole will also affect the screening efficiency of the spiral screening machine.Through simulation,it can be obtained that the screening efficiency is the highest when the screen hole is 88 mm,and the screening efficiency is 79.9%.In the study of the particle moisture content,it was found that the higher the moisture content of the material,the lower the screening efficiency of the spiral screening machine.It is found that the average velocity of particles moving along the spiral rod increases with the increase of the rotational speed of the spiral rod.It can be seen that the higher the screw speed,the higher the screening efficiency of the screw screening machine.In the study of the screw pitch,it is found that the screw pitch is too small,and the screw can not give enough driving force to the particles.It is found that with the increase of screw pitch,the screening efficiency of the screw screen machine is lower.Discrete element research on the screening process of the spiral screen machine,more profound revealed the principle of the spiral screen machine,provide certain theoretical support for the improvement of the spiral screen machine sieve machine,through the experimental platform can be built to verify the discrete element simulation of the spiral screen machine,prove the accuracy of the discrete element simulation.