Research On The Key Technology Of The60t Mining Dump Truck

Mining dump truck is very important mine trackless transport for mining large-scale projects and mine site. Due to the poor and complex particularity working conditions, The requirement for the key component and overall performance of the dump truck are very high. This thesis takes mine dump truck carriages and frame as the most important parts for research, and the passage of vehicles, power and ride the stationarity for study, and analysis the key technology of mining dump truck.In this paper, the major work done as follows:1, Reference to the overall layout parameters of the mine dump truck,draw the mining dump truck three-dimensional structural models of carriages and frame, and based on the complexity of the site, mine environmental conditions, simulation analysis the respective mining dump truck work conditions that may occur in the course of their workings.Then according to comparison of the maximum stress value was obtained with the yield stress value of the structural material used dumper, then evaluate the strength and the rigid of the mining dump truck’s most important parts--carriage and frame.2, Referring to the overall layout parameters of mining equipments, mining equipments are drawn carriages on the3d structure model, material selection of Q235, safety coefficient is1.2, the allowable stress value is196M Pa. According to the construction site of the complexity of the environmental conditions, mine, mining equipments may arise in the working process of the working condition of the bearing performance and simulation analysis was made on two kinds of working condition of concentrated loading. Received the biggest stress value compared with carriage structure material allowable stress value, bearing sex, according to the results of train dynamic load coefficient is1.3, meet preset load rating of60tons bearing strength requirements; Concentrated load, according to the results of either concentrated load is loaded in the bottom or front part, with the strength of the material Q235can meet the need. 3, When analysis the mine dump truck’s ride comfort performance. Take the oil and gas suspension system, which is the important damping components as the study objects, establish the structural model and the simulation analysis. At the same time discussed some of the factors affecting the oil and gas suspension stiffness. After analysis,the rigid of Oil and gas suspension only relevant oil and gas suspension system structure in the state of stationary; when in the state of campaign it relevant Hydraulic cylinder piston displacement into nonlinear, and it has nothing to do with the piston velocity.After input some sinusoidal excitation signal, the result of simulation results obtained shows, the mining dump truck oil and gas suspension acceleration is always less than9.8m/s, it explanation the oil and gas suspension has good damping properties.4, Referring to the overall layout parameters of mining equipments, mining equipments are drawn carriages on the three-dimensional structure model. Frame, which the integral frame material selection Q345structural steel, high strength safety coefficient of1.5, the allowable stress values of230M Pa, the design of the rated bad of60tons. Depending on the complexity of the construction site, the mine environmental conditions, the frame respectively through modal analysis under the constraint conditions and working conditions of different vehicle performance analysis. First-order modal analysis show that the frame frequency of23.017Hz; the second order frequency is90.036Hz, can effectively avoid the engine idle speed rotation frequency of53.33Hz. Delivery performance level condition, right front wheels and rear wheels left dangling after, right front left dangling at the same time four working conditions were analyzed, and the results show that the frame conditions the maximum stress is right front left rear wheel dangling at the same time, its value is136M Pa, less than the allowable stress of Q345230M Pa.5,It simplified model for the mine dump truck front push rod combined type lifting mechanism. According to the motion mechanism, it is derived key changes in geometry and mechanics equation. Established the maximum lift coefficient and pressure fluctuation coefficient weighted objective function, In general layout space and the geometric constraint for the mathematical model of constraint conditions, and through the simulation analysis and optimization, mining equipments required cylinder under the same discharge conditions of maximum thrust fell by10.1%, the hydraulic system of hydraulic fluctuation coefficient reduced by10.7%and reduces the maximum thrust ferce and oil pressure fluctuation coefficient, has played a good optimization effect.