Study On Productivity And Mechanism Movement Analysis Of Face-shovel Hydraulic Excavator

In recent years, with the rapid development of the construction and the mining industry, the single-bucket face-shovel hydraulic excavator, as one of the most important engineering mechanical, is the exponential growth in demand, at the same time, the technical and economic performance of the hydraulic excavator is higher demanded.Excavator productivity is one of the major technical and economic indicators, which represents the quantity duged up and transported to the transport vehicles or mound from'Zhang Zi'in the unit time. Especially to the large mine face-shovel hydraulic excavator, because of its enormous power and bucket capacity, it's task period and the economic costs are often relation to the productivity, in directly. Based on the analysis to the hydraulic excavator's mechanism kinematics, the productivity of the face-shovel hydraulic excavator has been studied in-depth and systematic in the paper.First, as to the face-shovel hydraulic excavator's the mechanism features, a detailed analysis of its operating processes and the typical mining conditions are been studied, the conceptions of the theory productivity, calculate productivity and the actual calculation are given, and the theory foundation is laid in the paper.Second,"the coordinate alternation matrix law"is analysised and introduced, basis on which, the working device(Multi-Degree-of-Freedoma and Multi-bar sysetem) of faced-shovel hydraulic excavator is analyzed in the mechanism movement area, and some key points'coordinate transformation matrixs are established, it provided some conditions for the arm of force's models establish.Third, by the use of"Mapping Theory", the operating process of the face-shovel hydraulic excavator's boom, arm, and bucket is studied based on the productivity study, a series of functions of the arm of force of moving parts and working medium to its key articulate points (A, B, C point) are established. And based on that, some mathematical models of initiative cylinders'pressure to cornerα,β,γof entire power variable system under each operating condition are established. And then the functions of hydraulic excavator cylinders'operating speed to the cornerα,β,γare finded, so a theoretical basis of hydraulic excavator productivity reaserch is provided.Then, the structure and its working principles of a large-scale face-shovel hydraulic excavator's typical hydraulic system are introduced. By use of mathematics, physics approach, the operating characteristic of rotating components of the double-pump double-loop full-power variable flux system is In-depth analyzed. The calculation process of the time required of the rotary devices operating process, such as costant acceleration, varying acceleration, uniform speed and braking are studied in detail, and its series functions are established.Then again, the method of calculate face-shovel hydraulic excavator operating cycle time is introduced, by integral the corner ofα,β,γ. The mathematical modeles of each operating cycle time to the corner ofα,β,γof the face-shovel hydraulic excavator with floating structure working device.Finally, based on the above series functions, under the VC programming environment,"Mine face-shovel hydraulic excavator shovel productivity analysis and calculation software"have been programmed. The Software integrates arms of force of moving parts and working medium to its key articulate points (A, B, C point) analyze and calculate module, pressure of hydraulic cylinders analyze and calculate module, characteristic of turntable rotating and time analyze and caculate module, hydraulic excavator shovel productivity analysis calculation module, etc.The successful application of the software in the process of products design fully reflects the guiding role of the productivity in product design. The software is common use and can be used in production directly.