Parametric Design And Finite Element Analysis Of75m~3Mining Excavator’s Main Components

China is a country with abundant coal resources reserves, miningtechnology and equipment level directly affects the coal mine productioncapacity. With growing numbers of continuous productions of open-pit coalmine, the large-scale trend of excavator is irreversible. The development ofmechanical excavator technology has become the urgent needs of customer. Theperformance of mechanical excavator quality directly affects the enterprise’seconomic benefit and labor productivity, and the performance of workingdevices directly affects the performance of the complete machine. The bucket-bucket rod mechanism is the main bearing components in the excavator workingdevice, and the efficiency of the working device is influnced by the performanceof the mechanism. At present, the domestic researchers have not yet fullyunderstand the stress distribution law of bucket-bucket rod mechanism, and theperfect method of it’s engineering calculation can’t be found. The complexity ofthe structure leads to the repetitive design of working device. The traditionaldesign method takes a lot of time and energy, in addition, prone to error. Usingthis method to carry on the design greatly increases the cost and extends the design cycle. It is hard to meet the demand of the market, so we need to find aneffective method to meet the needs of the product research and development.This paper mainly studies on the main components of WK-75large miningexcavator’s working device. The parameterized model of main components isbuilt on UG, and then the paper analyzes main components by utilizingworkbench platform on the basis of simplified model.First of all, the structure of the main components should be understoodclearly, and the complex assembly can be decomposed into several relativelysimple parts for the framework design. Ignoring the details of the model, thispart of the design analysis the framework control parameters and the mainrelated parameters which can be used to determine the control benchmark. Thispart of the design makes the overall structure model controlled by a smallamount of parameters. The product assembly’s components will updateautomatically when the general control size changes, avoiding the waste of timeand energy. On PTS module, human-computer interaction dialog box can beestablished, which makes the data input simple and convenient.Secondly, product design level should be set up. By using the geometriclinker in the WAVE module，parameterized model of subject design level can belinked to the finished product design level. After the detail operation, just asbevel cutting and chamfering, the assembly parts and main parts of engineeringdrawing can be generated. Set up the Product analysis layer, link the assemblyfrom the product, and then simplify the assembly model. Finally, export simplified modal with x_t format and make preliminaryfinite element analysis by importing this model into the workbench software.Theanalysis results show that under the condition of normal work, the stress whichthe bucket-bucket rod mechanism beared is low, and the performance of theorganization can completely meet the requirements of users to productreliability.In this paper, the establishment of the parameterized model of workingdevice, to a certain extent, avoids repetitive design, saves design time andenergy of designers and improves the R&D efficiency. At the sametime, considering the importance and vulnerability of working device in theactual work, this paper carries on the finite element analysis to the main parts ofworking device, compares with the actual work condition, and verifies the highreliability of analysis results.