The Study Of Performance Optimization For Working Range And Digging Force On Face-shovel Hydraulic Excavator Working Device

Face-shovel hydraulic excavator has been more and more widely used in several applications in engineering such as open coal mining,water conservancy construction and so on,and the working device is an important working part of shovel hydraulic excavator,its structure rationality could directly affect the work performance of excavator.Hence,it is necessary to study the working device as the base of complete machine development.Optimal performance of the working device,is one of targets designers effort to seek.Face-shovel hydraulic excavator working device is composed of swing mechanism,boom,arm,bucket,and many other components.Using the traditional analogy graphing method,the design will be tedious,low precision and long cycle,it is not easy to gain a satisfying program,and always required physical prototype to evaluate the overall performance of complete machine,which will gain long create cycle,high cost and have difficulty in changing.At present,a number of enterprises and research institutions have done some research with virtual prototyping on backhoe excavator work device,which shortening the design cycle and saving design cost,but little study can be found on face-shovel hydraulic excavators.This article according to initial design provided by a manufacturer of excavators,utilized virtual prototyping to carry on the kinematics and dynamics simulation research to a face-shovel hydraulic excavator working device,through adjusting key hinge point to reorganize the working device structure program,to make the improvement of the working range and the digging force performance.The result indicated that,after the optimization,the improvement program theoretic performance slightly better than the overseas same level product,it could make the real machine performance close to the foreign produc.This article main research work is as follows:1)Based on the dynamics and kinematics analysis of the face-shovel hydraulic excavator working device,the optimization design method of working range and digging force performance was reached,making the theoretical foundation for the next simulation optimization.2)Based on original data,3D solid model of face-shovel hydraulic excavator was built by UG software,exported it as a PARASOLID file and imported it into MSC.ADAMS,add restraint and drive,to built kinematics simulation model of the working device;add a hydraulic system into the kinematics model to build the dynamics model of the working device in ADAMS/Hydraulics.3)Through kinematics simulation of the working device,the mining envelope diagram of initial design program and main performance index of working range were obtained;Through adjustment of key hinge point,the performance of working range has optimized,the optimal program got larger working range,the theoretic working range performance is superior to the foreign product,simulation results show that the working device could work for typical working conditions.4)Through dynamics simulation of the working device,maximum arm digging force of the initial design program was obtained;through adjustment key hinge point,the performance of digging force has been researched and the am digging force has been optimized,and researched the performance of maximum bucket digging force and working range while the arm digging force is maximum.The results checked the theoretic working range and digging force performance is slightly better than the foreign same-level product,it provided effective reference for manufacturing of physical prototype and assessment of new model design program.