Research On Digital Design System Of Key Components Of Swash Plate Axial Piston Pump For Construction Machinery

Hydraulic pump is a power element that can convert mechanical energy into liquid pressure energy.It is widely used in engineering machinery,chemical industry,aviation,electric power and many other industries.Because of its complex structure and high processing precision requirements,coupled with the late development of domestic hydraulic technology,the technology is relatively backward,currently most of the domestic high-end hydraulic pumps need to be imported from abroad.Domestic hydraulic manufacturers are generally in the situation of overcapacity of ordinary hydraulic parts and insufficient level of R&D and production of high-end hydraulic parts.A few companies that can manufacture higher-level hydraulic pumps also rely on imitation of foreign brands.In order to improve the independent design ability of domestic enterprises on hydraulic pumps and promote the rapid and effective research and development of hydraulic pumps,it is hoped to develop a digital design system for key components of swash plate axial piston pumps for construction machinery for designers.Under the premise of mastering the basic design principles of the swash plate axial piston pump,this research draws on the latest research results at home and abroad,and conducts a statistical analysis of the structural dimensions of the key components of the piston pump with superior performance at home and abroad,and simulates it through ANSYS.Analyze and summarize the design rules,give more accurate recommendations within the original design size range,and summarize the design-related sizes to determine the design coefficients,and compile and integrate various design modules based on Visual Studio.And combined with the check modules of the plunger pair and the sliding shoe pair,the digital design system was built.It is realized that the designer can determine the basic design size of each key component through the four basic parameters of the displacement of the plunger pump(ml/ rev),the number of plungers,the maximum speed(r/ min),and the rated pressure(MPa).The connection between the digital design system and the 3D parametric design system is completed by the method of corresponding extraction of coordinate points,so that the parametric design system integrated in Solid Works can directly obtain the design parameters to complete the 3D model drawing.After the development of this design system is completed,designers will no longer need to perform cumbersome adaptation of various parameters when developing and designing swash plate axial piston pumps in the future,which can greatly reduce the size of the part design and the drawing time of three-dimensional parts.Reduce the time cost of research and development.And based on the design parameters of this system,it can provide a basis for solving the problems and improving the performance of the existing pumps.So that designers have the ability to develop and design independently,and get rid of the shackles of constant imitation.In order to further optimize the parameters of the digital design system and obtain the relevant design simulation and experimental reference data,this study uses ANSYS to conduct a thermo-mechanical coupling analysis on the cylinder block and the plunger,and verifies it through enterprise experiments.A reasonable suggestion is put forward for the optimal value of,taking into account the volumetric efficiency and preventing the plunger from "seizing" the gap between the plunger and the diameter of the plunger.Finally,Fluent is used to simulate the fluid domain of the sliding shoe pair to study the influence of the oil guide hole of the sliding shoe on the oil film pressure,and it is determined that the structure of the sliding shoe with internal and external auxiliary support belts is better within the allowable size range.