| With the development of the national economy,as important tools which have the function of carrying in engineering,dump trucks have an increasingly production and varieties year by year.The lifting hydraulic cylinder is the actuator for dump truck lifting movement,and is the key component to determine the performance of the dump truck.Generally,lifting hydraulic cylinder for dump truck is multi-stage telescopic hydraulic cylinder,which has a long stroke and a lot of parts that need to be assembled.The lifting hydraulic cylinder has to support a great load when it works,so it requires excellent quality and property.At present,when related enterprises design and manufacture hydraulic cylinders,they mainly rely on the designer’s experience.This traditional design method is time-consuming and costly,and is not fully applicable for hydraulic cylinders of new or complex structures.This topic is based on a quality problem which occurred in an actual production of a hydraulic cylinder manufacturer.In this paper,a three-stage telescopic lifting hydraulic cylinder named 3TG-E133×2700Z was seemed as research object,by using CAD/CAE method,strength and stability of lifting hydraulic cylinder is studied in detail.The main contents for this paper are followed:(1)The structure,working principle and quality problems which prone to happen in design and manufacture link of the dump truck was analyzed in detail.According to the actual size,modeling and assembly of each part of hydraulic cylinder was finished by three-dimensional modeling software UG,while the weld modeling at the key position of hydraulic cylinder was built.(2)The mechanical calculation model of hydraulic cylinder was established,and the hydraulic cylinder force was analyzed and calculated under 1.25 times pressure,acquired maximum stress and displacement of hydraulic cylinders,and check the strength of each section based on the fourth strength theorem.Calculated the critical load of the hydraulic cylinder by the energy calculation method and complete the check of the stability of the hydraulic cylinder.(3)Import the three-dimensional model of the hydraulic cylinder with different weld structures into the finite element analysis software ANSYS Workbench,after the static analysis of hydraulic cylinder under 1.25 times pressure,we got the value of maximum stress and displacement and the distribution diagram of stress-effective and deformation.Then the linear buckling of hydraulic cylinder was analyzed,completed the check of finite element stability analysis.(4)Compare the theoretical results with finite element analysis results,verified the feasibility of finite element analysis of hydraulic cylinders.According to strength analysis results,a structural optimization of hazardous areas was carried,optimized the secondary cylinder which was machined by weld to the overall structure,which effectively reduced the maximum stress value of the hydraulic cylinder and improved the reliability of the hydraulic cylinder.In this paper,a research on the three-stage telescopic lifting hydraulic cylinder named 3TG-E133×2700Z was carried,combined theoretical analysis with finite element analysis,strength and stability of the hydraulic cylinder were analyzed and a structural optimization scheme was proposed,which provided the recommendation for design and manufacture to the enterprise,and also provided the ideas for designing and checking of other types of multi-stage hydraulic cylinders. |
PDF Full Text Request