Research On Parametric Design Of Working Equipment Of Large Mining Excavator

As the minial resources of our country are exploited widely,the demand for excavator is on the increase daily.Large mechnical excavator is used in the exploitation of strip mine,which has the advantages such as strong adaptability,high productive efficiency and steady performances.If we take the traditional methods of design and research,we can't fit the high requirement for the globalization in the field of excavator,the intensification of competition,individuation of requirement for products and humanization of production.So all enterprises hope to sdudy and design an all-purpose module,thereby reducing the developed periods of the produces and enhance the productive efficiency.In this paper the parameterized design and the finite element analysis are done aiming at the working equipment of large mining excavator, which includes arm,dipper and bucket .During the working process, they are demanded highly because of the abominable condition.The paper is composed of three parts.In the first part,we develop the soft of parameterized design of the working equipment of large mining excavator.It is very significative .Because during the moment of notional design ,development and design are the most step in the process of the development of the products,which determines the cost of the product for 70 percents to 75 percents and the quality and performance of the product for 80 percents more or less.This method can reduce the times for the redesign and shorten the developed periods of produces.Aiming at the trait of the working equipment of excavator,the tool for the quadratic development of UG and the programming language are used to do parameterized design for every part so as to realize the autogeneration of the parts.The analogical theory is used to decide the basical parameter and the language for the quadratic development of UG named GRIP is taken to build the models according as the moulded dimension of 27m3 and 35m3 which are offered by the manufacturers in the process of the design.Then other tools for the quadratic development of UG are combined to design the User Interface .Finally,a module which can be loaded automatically named"the parameterized design for excavator"is built.In the second part the arm,dipper and bucket are built on parameterization used ANSYS.The design for most produces has to be done by the step as"design– modeling– analysis– modification– remodeling– reanalysis".APDL is a language of ANSYS for parameterization and It apply the function of circulation which is mentioned in front using the way of intellective analysis.In the paper the models are built by the parameterized design of APDL and then taken to finite element analysis because the soft UG and ANSYS can't work together well.The process of modeling written by the language of APDL is saved as notepad and The module can be loaded to the menu bar after the ANSYS is run.Then we knock the button and the model can be built automatically.In the third part the three parts of working equipment of excavator are analysed on intension of finite element.There are two working conditions for the arm.One is that dipper is holden out in the direction of plumbing the arm,which is effected seriously when the bucket is digging.The other is that dipper is holden out fully and horizontal when it is filled up and started up and broken.The results of analysis of arm indicate that the maximum of stresses is in the middle place,which is smaller than the allowable stress of the material of 15MnV.The working condition of dipper is when dipper is horizontal and holden out in the working bound and is met by impediment in the height of protrusive shaft.The result is fit with fact and the design is safe.The analysis of bucket also has two conditions.One is that bucket is in the lowest digging place and the other is in the horizontal place.It is known from the result that the maximum of stresses is in the junction of frontwall and backwall because of the bad transient.The maximum is smaller than the allowable stress of the material.The parameterized design for the working equipment of excavator is realized using the tool for the quadratic development of UG and ANSYS in the paper.The result and method have great significance in pratice.They can enhance the developed efficiency and shorten the design periods and improve the quality and dependability of the produces .Finally it can bring obvious economic benefit.