Research On Dynamical Analysis Of Road-header And Vibration Reduction About The Electric Cabinet

As the major construction equipment under the mine roadway, boom-type road-header is a kind of local face TBM(Tunnel Boring Machine)relying on cantilever and cutting head. When cutting hard rock, the road-header is subjected to severe impact load, and the electric cabinet vibration is influenced by the power chain of the frame.The mechanical and electrical failure is common in engineering, caused by vibration. Vibration attenuation is an crucial measure to reduce the failure rate and to increase reliability. Therefore, it is necessary to study on the vibration characteristics of road-header, which should be considered from the design phase.Vibration response characteristics of the electrical cabinet in road-header was investigated, taking EBZ300 road-header as an example.Firstly, a simplified road-header solid model is built using UG. The model analysis technique is used to analyze stress, deformation distribution and the inherent frequency for the complete machine. It's essential for further research on the electrical cabinet vibration response and to analyze rationality of thestructure design. Meanwhile it can be an essential theory for further dynamic analysis.Secondly, to establish rigid system, simplified three-dimensional solid model is imported to ADAMS. Modal neutral file of the key parts is generated using ANSYS and is imported to the rigid system in ADAMS. Then rigid-flexible coupling virtual prototype model of the road-header is established.Using the empirical formula, cutting load of road-header teeth was computed.The load is added using IF function. Then the dynamics simulation of the road-header was analyzed. The response signal of the electronic cabinet and the measured vibration signal were analyzed, and the vibration frequency range of the electric cabinet is determined. Analysis showed that vertical vibration was more severe than the other two directions under the condition of transverse cutting. The most intense states was in the low frequency range through 0 to25 Hz.Finally, based on the method and the principle of vibration reduction, a mathematical model of the electric cabinet vibration is established.Using the theoretical calculation method, the principle of choosing the electric cabinet vibration isolation system shock absorber and the rigidity of the absorber is obtained. It provides theory for the design of absorber which is used to reduce the vertical vibration of electric equipment box.