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.
This paper introduces computing method and evaluating indicator of 220 kW heavy wheeled tractor from the three aspects of basic parameters, overall arrangement and technical specifications.Then it expounds the characteristics and considerations of overall arrangement, provide a reference for the overall design of relevant mechanical products.
At present, the no-till planter widely used in Northeast China relies on increasing the weight of the whole machine to increase the stubble breaking force.However, the gravity of the planter itself is too large, which easily causes the ridge platform to be flattened and the ridge shape to be destroyed.How to get a greater pressure into the ground without increasing the weight of the whole machine is a new topic at present.This paper takes 2BMZF heavy-duty no-till planter as an example, analyzes the working state of the no-till planter, establishes a mechanical model and simulates it with ADAMS software, this paper probes into the change trend and analysis of the stress of each part of the planter under different adjustment modes, finds out the main factors that affect the sowing trenching force and the mechanism that the position of the center of mass of the planter affects the stress of the planter, and puts forward some guiding opinions for the design and adjustment of the no-till planter.The research results of this paper have certain reference significance for the development of no-till planter.
Friction V-belt drive works by the friction between belt and pulley.It belongs to the application category of external friction and plays a good active force effect at the same time.On the off-road diesel engine, according to the practical analysis of engineering application, this paper focuses on its working characteristics and geometric calculation, mainly involving the origin and structural form, working composition and operation characteristics of friction belt drive, wedge supercharging principle and geometric relationship, equivalent friction coefficient and wheel groove matching, etc.
This paper reviews the evolution process of tractor cab suspension, and introduces the general design method of rubber shock absorber suspension; Through the analysis of the tractor vibration transmission route, the relevant contents of the test of the vibration characteristics of the tractor cab are extended, and the evaluation indexes and evaluation methods of tractor cab vibration comfort are expounded systematically from four aspects.
In order to reduce the exhaust of diesel engine, improve the product performance and meet the requirements of environmental laws and regulations, under the premise of not changing the cylinder diameter and cylinder center distance, a diesel engine is designed without cylinder liner, piston ring matching upgrade, optimize cylinder clearance reasonably, the exhaust significantly reduced under the same conditions.
A four-column cab is taken as the research object.Firstly, a body-in-white finite element model of the cab is established, and the precision of body-in-white model is verified by modal analysis and comparison with experimental results.The simulation model of cab with interior was established on the basis of body-in-white model, and the vibration acceleration response of the left foot floor and seat bracket of the tractor was obtained through modal based forced response analysis, which was compared with the test results.Finally, the floor of the cab was optimized, and the maximum vertical vibration acceleration of the seat bracket decreased by 47.1%,the total vertical vibration acceleration of the seat bracket decreased by 12.3%.
Ribbed belt has the advantages of large transmission power and compact layout, it’s application is increasing resent years, but the working condition is very complex for off-road diesel engine, the accessory drive system should be designed properly if ribbed belt is used.Some design principles and experience is raised in this article, and an accessory drive system was designed and analyzed on an in-line 4 cylinder off-road diesel engine, a test was designed and did on test bed.It shows that the dynamic performance meet the design requirements.The crank pulley has a 2.04% max slippage, and it reduced rapidly while the engine speed up; The peak vibration amplitude is 4.59% of the belt between alternator and water pump; The max tensioner swing angle is 2.69°,and it’s variation trend along engine speed has a high consistency with the second order torsional vibration curve.
As the main function of the harvester, grain unloading is particularly important on the driverless harvester.When the driverless intelligent harvester and the grain truck work together smoothly, they can unload grain safely and efficiently.In this paper, a grain unloading collaborative control method suitable for unmanned harvester is proposed.The control method is modeled in the Simulink module of MATLAB.The control system is verified according to software simulation and real vehicle test to judge the feasibility of the control system.
Hydraulic turnover plow is the most widely used agricultural farmland machinery in the world.Its technical level reflects the level of agricultural mechanization to a certain extent.At present, European and American countries are leading the field of high-end hydraulic turnover plow products, while domestic high-end hydraulic turnover plows are at the beginning.This paper studies and analyzes the technical status of typical high-end hydraulic turnover plows abroad, discusses some problems existing in domestic hydraulic turnover plows, and puts forward suggestions for the development of high-end hydraulic turnover plows in China, which provides reference for the research and development of high-end hydraulic turnover plows in China.
This paper introduced the key design points of off-road diesel engine lubrication system, combined with the application conditions of off-road diesel engine.Like the oil pump design, piston cooling jet, oil gallery size, etc.This may help other designers.
This paper introduces the problems of synchronizer shifting in tractor transmission, analyzed the wear resistance of synchronizer shift fork, and puts forward the solutions to the problems.
In this paper, the current domestic and foreign types of strapping machine and the status of a simple exposition of the advantages and disadvantages of a variety of strapping machine analysis, and the future development trend of the strapping machine outlook.
As an important means of production, tractor plays an important role in the national economy.Adjusting the quality distribution of tractor by increasing or decreasing the counter weight is an effective measure to exert tractor’s traction force, improve tractor’s working efficiency and reduce fuel consumption.Starting from the relationship between tractor traction force and counterweight, this paper introduces the theory of counterweight design, typical counterweight structure design, simple method to judge whether counterweight is appropriate and the latest development trend of counterweight, which provides reference for tractor design technicians and basic users how to use counterweight correctly.
Develop and build a set of electric vehicle charging pile simulation training system, using “production site equipment（charging pile functional module transformation）+virtual load loading（charging pile inspection instrument simulates electric vehicles）+simulated faults（charging circuit open circuit, short circuit, lack of phase, leakage, virtual connection, communication, pricing, etc.）+online soft control（remote terminal design）” “mixed imitation” skill training platform to meet the monitoring, scheduling, operation and maintenance and occupation of charging pile-related employees Cultivation of high-skilled talents in colleges and universities.
Natural gas fueled engines are widely used in some fields.Based on this, the control system of natural gas engine is developed.In the application layer software of the control system, the air intake and charge efficiency is an important link, and the control accuracy depends on the calculation of the current charge efficiency.Based on the physical model and the signal of intake pressure sensor, this paper studies and designs the charge efficiency and intake volume calculation module of the natural gas engine control system.
