In agricultural machinery, the definition of each type of variables and content is different, the agricultural machinery fault diagnosis software is a model corresponding to a software, based on the background, develop a general agricultural machinery fault diagnosis software is very necessary.VS2019 platform, C# language and Access database are used to develop the software.In order to manage the software and encrypt the protocol data, the software uses dongle to manage the software, and uses random number and AES encryption algorithm to encrypt the protocol data.
The hydraulic reversible plough is an important agricultural machine in the agricultural production process.Its main function is to loosen the soil, eliminate weeds and pests, improve soil structure and improve soil fertility.Based on the analysis of the working conditions of the hydraulic reversible plough, the types and structure of the common hydraulic reversible plough, this paper proposes the design method of the hydraulic reversible plough.The design ideas and key points of the hydraulic reversible plough are analyzed and discussed.Provide reference for the design and production of domestic high-end hydraulic reversible plough products.
The thin-walled box of large tractor is easy to deform and requires high machining accuracy.During fixture design, improper selection of positioning datum and pressing point can easily lead to deformation of parts, which leads to the machining accuracy not meeting the drawing requirements.By using CAE software combined with machining requirements, multiple schemes of positioning and clamping points are compared, which vividly shows the influence of different schemes on the processing accuracy of the box.Through the optimization and improvement of the scheme and the actual machining verification, the machining accuracy required by the drawing is achieved, and the accuracy of fixture design and the machining accuracy of parts are improved.
The rapid development of the power field has put forward higher requirements for the power density, speed and volume of diesel engines.The development of key technologies for high power density diesel engines is a powerful guarantee to improve the performance of large agricultural machinery and heavy construction machinery in China.High power density diesel engines have the characteristics of large fuel injection volume.It is of great significance to study the ultra-high pressure fuel injection technology suitable for high power density diesel engines.The influence of injection pressure increase on fuel spray atomization and combustion was studied by numerical simulation.When the fuel injection pressure increases from 100 MPa to 250 MPa, the liquid spray penetration becomes shorter, the gas spray proportion increases significantly, and the SMD becomes smaller; The vanishing time of liquid spray is advanced, and the average turbulent kinetic energy increases; With the increase of injection pressure, the peak value of heat release rate increases, the heat release time shortens, and the combustion duration shortens.The use of 250 MPa ultra-high pressure fuel injection can improve the atomization quality of spray, accelerate the combustion speed, and help to improve the power density of diesel engines.
In this paper, the important component of load sensing hydraulic system is described.And then, in order to fully understand and master the load sensing technology, the basic principles of different types of load sensing hydraulic systems are introduced.Finally, the application example of load sensing technology in tractor hydraulic system is given, which is of practical significance for the extension and application of load sensing technology in domestic tractor hydraulic system.
