基于Pro/E软件的ZL30型装载机工作装置受力分析

Force analysis on working device of ZL30 loader based on Pro/E software

为研究ZL30型装载机工作装置机械静力学特性,以及装载机工作运行时机体的受力情况,文中采用Pro/E软件计算下限铲掘工况各部件铰接点的受力并加以分析,对装载机工作过程中的受力最大时刻进行模拟。结果发现:其工作装置铰接点受力最大点集中在动臂与前车体的铰接点F点和动臂与动臂油缸的铰接点H点上。各个铰接点与前车体上铰接点距离越近,则受力越大;与铲斗铰接点距离越近,则受力越小。在对装载机的动臂和摇臂强度校核中,动臂在下限铲掘时,受力最大截面发生在横梁与H点铰接处,正应力值为61.13 MPa,剪应力值为8.37 MPa,两者均远小于许用应力值;摇臂在下限铲掘时,受力最大截面发生在铰接点B点所在的横截面,正应力值为7.27 MPa,剪应力值为0.71 MPa,两者也均远小于许用应力值,因此,装载机动臂和摇臂均满足强度要求。

In this article,in order to explore the mechanical static characteristics of the ZL30 loader's working device and the force on the body when it is working,the Pro/E software is used to calculate and analyze the force on the hinge points of each component in the lower-limit digging condition,and the moment of the maximum force in the working process is simulated.It is found that the working device's hinge points characterized by the maximum force are the hinge point F between the boom and the front body and the hinge point H between the boom and the boom cylinder.The closer each hinge point is to the hinge point on the front body,the greater the force will be;the closer it is to the bucket hinge point,the smaller the force will be.As for strength check of the boom and the rocker arm,when the boom is digging at the lower limit,the worst force section is at the junction of the beam and the hinge point H,with the normal stress of 61.13 MPa and the shear stress of 8.37 MPa,both of which are far less than the allowable value.When the rocker arm is digging at the lower limit,the worst force section is at the cross section where the hinge point B is located,with normal stress of 7.27 MPa and the shear stress of 0.71 MPa,both of which are far less than the allowable value.Therefore,both the boom and the rocker arm meet the requirements of strength.