Parameters Matching And Finite Element Analysis Of Damping Buffer System For Electric Control Box Of Roadheader

Roadheader is a kind of integrated mechanized excavating equipment that widely used in areas such as coal mining, tunnel construction and mineral mining. Due to the harsh working conditions and strong body vibration of the working roadheader, there exist problems like malfunction of the electrical components, shedding of the wiring terminals, and fatigue failure of the circuit welding point in the roadheader's electric control box, which is sensitive to vibration. As a result, the control precision of the electric control system is decreased, which causes the halt of the working equipment and the reduction of the production efficiency. Therefore, investigating the vibration characteristics of the electric control box and developing high performance damping shock absorber for electric control box are of great practical significance.Referring to the Jincheng science and technology project plan — Research and Development of the Viscoelastic Damping Buffer Device Used in Coal Mining Roadheader and the analysis based on the structure characteristics and the actual working conditions, a dynamic model of the damping buffer system of the electric control box was set up, with the longitudinal roadheader as the research object. Then, with the load of the cutting head was used as the excitation and the vertical acceleration of the electric control box was used as the evaluation index, the stiffness and damping parameters which were between the electric control box and the body were matched. Parameters analysis showed that the correlation between the stiffness and damping effect was negative while the correlation between the damping and damping effect was positive; a better damping effect was achieved when the stiffness of front shock absorber was less than the rear and the damping of the front shock absorber was greater than the rear.Through a large number of investigations, a cylindrical rubber shock absorber of 360° equal radial stiffness was applied in the electric control box. According to the best match of stiffness and damping and the hardness of rubber shock, material properties, elastic modulus and stiffness parameters of the cylindrical rubber shock absorber were studied. And structural parameters and installation arrangement of the cylindrical rubber shock absorber were obtained. Finally, based on the two parameters Mooney-Rivlin constitutive relation, the finite element model of the cylindrical rubber shock absorber was established and nonlinear analysis was carried out. The analysis showed that the stress, strain and deformation of rubber and the stress of inner and outer rims were within the scope of their material license, which met the requirement of its practical use.At the same time, it can also provide references for the improvements of vibration isolation system and dynamic characteristics analysis for electric control box.