Study On The Front Oil And Gas Suspension Of TLD 110 Mine Dump Truck

TLD110 mine dump truck is a mine dump truck with rated load of 70 tons developed by Shaanxi Tongli heavy Industry Co.,Ltd.,which uses advanced oil and gas suspension system.Theoretically,the hydro-pneumatic suspension system can improve the ride comfort and driving comfort of the mine dump truck,but when the mine dump truck is used in the mining area,cracks appear in the front of the frame,the tire wear is serious,and the tire is easy to burst.It is found by test that the pressure change in the front oil and gas suspension cylinder under impact load is discontinuous step jump and the effect of shock absorption is not obvious.As a result,the hydro-pneumatic suspension does not achieve the effect of improving ride comfort and driving comfort.In this paper,the theoretical analysis,simulation and experimental study on the oil and gas suspension system in front of mine dump truck are carried out in view of this engineering problem.Firstly,according to the specific structure and related parameters of the front suspension system of TLD110 mine dump truck,the mathematical model of the front oil and gas suspension system is established,and the output force of each structural parameter of the front oil and gas suspension to the front oil and gas suspension is solved and analyzed in Matlab.The influence of stiffness and damping,among which the initial inflatable pressure and initial inflatable volume have great influence on the stiffness,and the larger the inflatable pressure or volume is under the same excitation,the smaller the stiffness value is.The damping force is greatly affected by the damping hole flow area and the effective flow area of the one-way valve,and the larger the damping hole area or the effective flow diameter of the one-way valve is,the smaller the damping force is under the same excitation.At the same time,the simulation results show that the structure parameters of the oil / gas suspension in front of the TLD110 dump truck are basically reasonable.Secondly,the dynamic model of the front suspension is established by using AMESim software.Under the no-load and full load conditions,the simulation range of the acceleration of the front suspension conforms to the law that the acceleration transfer direction is from the bottom to the top;under the loading condition,the change range of the acceleration of the front suspension conforms to the law that the acceleration transfer direction is from the bottom up to the top.The range of acceleration simulation in front suspension accords with the law of acceleration transfer direction from top to bottom.Finally,the ride comfort test of TLD110 mine dump truck is carried out,which verifies that the test results of the front suspension under no-load and full-load driving conditions are consistent with the dynamic simulation results of the front hydro-pneumatic suspension.At the same time,the cause of the discontinuous step jump phenomenon in the cylinder pressure change under the impact load is analyzed theoretically,and the cause of the problem is determined to be the overconstraint of the front oil and gas suspension cylinder.It is proposed that the installation mode of the front suspension should be changed to a hinged way to solve the problem of discontinuous step jump of the pressure variation in the front oil and gas suspension cylinder under the impact load.This paper provides a reference for the design of the oil and gas suspension system.