The Study Of Static And Dynamic Mechanical Properties Of Vibrating Screen

The mesh material will be liable to deform severely due to the relatively small stiffness, which may influence the normal using of a structure, and the weight of this material will be heavy and the resource will be wasted if the entity rate is too high. Based on the homogenization theory, this paper will explore the relation between the property and the types and arrangements of mesh material. As one kind of mesh material, when screening gangues, the vibration screen can resonate with the impact of gangues, and the impacting stress may cause cracks which may influence normal using. Globally, researches on dynamic mechanical properties of the vibration screen are immature, and this paper will make improvements in modal analysis and impactimg simulation. The results of this paper will provide a reference value to the design or choosing of mesh material, and the design of vibration screen.At first, this paper performs the prediction of the equivalent elastic parameters of mesh material in different types and arrangements. With the help of ABAQUS, we establish the structural model of a single cell of mesh material, apply the cell with periodic boundary condition by modifying input file, and call the script to calculate engineering elastic parameters. By using this method repeatedly, we draw the variation curve of mesh material with different type and in different pattern, and find the property differences among mesh material with different type and arrangement. Then, this paper conducts a modal analysis to vibration screen, finds that it has the resonance danger. So we design the curved screen and avoid the resonance danger by adjusting midspan height. Finally this paper performs a simulation on gangue's impact to study the relation of impacting stress with impacting position, number of impacting points and impacting height, and finds the way to reduce the impacting stress.Results show that, when the entity rate is fixed, the equivalent elastic and shear moduli of packed round hole are bigger than that of honeycomb structure; the equivalent elastic modulus of orthogonal round hole material is bigger than that of packed round material, on the contrary the equivalent shear modulus of orthogonal round hole material is smaller than packed round hole material; the curved screen with the midspan height of 40 mm has the first natural frequency of 101.96 Hz which is higher than the excitation and resonance frequencies; the height between the material entrance and vibration screen should be less than 30 mm, we can reduce the kinetic energy of material by placing a dead block 20 cm above the screen, which can also help to diffuse the impacting material in order to avoid the destruction caused by multiple impacting.