The Design Of Optimization On The Working Device Of Large Hydraulic Face-shovel Excavator

Large hydraulic face-shovel excavator have been widely applied in the open mining and water conservancy projects, and the work device is the important working component of hydraulic excavator, its structure directly impact on the working performance.The research is very important, also the basis for the development of the entire machine.From the composition and working principle of the hydraulic face-shovel excavator working device, analysis the four kinds of structural scheme for working device in the common project, determine digging and loading equipment. The didding location model of the working device is established, determine the related initial parameters with regressing equation and principle design, including the geometric and energetic parameters of the boom, stick and bucket structure.Drawing envelope diagram, used of geeting the tip of bucket tooth to reach the location, the density of points reacts the location of probability of bucket tooth can theoretically reach, The density of point is greater in the main digging district than at the border point; Through analysis of the straight line excavating condition, the changing scopes of boom's corner and the changing scopes of straight line excavating force are soluted in the whole straight line excavating process. The change of straight line excavating force accords to the changing process of the loading.Based on the typical process of digging and lifting, it uses of genetic algorithms to optimize the parameters of working device. After optimization, the transmission angle of structure increases, the trip of cylinders are shortened, the lifting forces of boom cylinders is more in line with the necessary force of raising the loading bucket from any excavating location to unloading points. After optimization, the changes in digging forces of the stick cylinder and the bucket cylinder are more than coincidengce with the change of the digging resistance of materials, improves mining performance.The designing software of large hydraulic face-shovel excavator is developed with MATLAB and VB.NET, Access as background database, shortens the cycle of research and development, reduces the cost of products and improves the quality of the design. The software system has features of inheritance, security, user-friendly. The autonomous designing system is initially formated, is universal significance with design for working device of large hydraulic excavator face-shovel.