Finite Element Analysis And Stress Testing Of Extendable Arm Of Backhoe Loader

With the development of economy, excavating machinery in engineeringconstruction plays a more and more important role. In all kinds of excavatingmachinery backhoe excavating equipment is the main equipment, is widely used inhydraulic excavators and backhoe loaders. The traditional design method of thebackhoe excavating equipment is analogical method, based on Benchmarkingproduct design as the basis to conduct appropriate changes. This design method iseasy to violations of benchmarking of patent products. Since the90’s of last century,China introduced2D software and3D software of mechanical design, designers usea variety of computer aided design software, can undertake mechanical kinematicanalysis, kinetic analysis, strength analysis. Since the80’s of last century, Chineseenterprise’s product design and test techniques have been improved, all kinds of newtest equipment, test methods were put into product design. With these modernmechanical design method, the product development speed to accelerate, thedevelopment of a variety, with the capability of independent innovation, andultimately help the enterprise to obtain better economic benefits.Extendable arm is an alternative module to the standard arm. Equippingextendable arm in the original machinery platform, users can obtain greater diggingand mining depth, only need to spend a small amount of charge and can enjoy thefunction provided by a bigger machine. In according to the trend of the productdevelopment of the backhoe loader, Liugong made a positive response to the needsof customers, developed the extendable arm module.Based one of liugong’s extendable arm as an example of the developmentprocess, this article expound how the finite element analysis technology and testtechnology applied in new product development. At first, describing the diggingforce calculation method, and deriving the calculation formula. And then, based thedigging force calculation formula as the foundation, we described how thetheoretical formula translated into operable calculation process. First establish thepoint file of the excavating equipment, select typical section of calculation in boomand arm, separate the whole mining space into finite postures. In each posturecalculate and compare the stress of sections and then output the dangerous postures.Try to combine the dangerous postures, output the hinge force at the dangerouspostures. In the PROE software establish the3D model of arm, and input it intoANSYS Workbench software. Then apply the hinge force to the model, calculate the stress of the model in dangerous posture. Finally layout many strain gages at theprototype, let the prototype working just as normal, obtain stress testing result. Wecheck up the design of extendable arm good or bad with the stress test results. In theend we could make a decision if we will improve the design of the product by finiteelement analysis and stress testing.