Design Of Table Cutting System For Foldable Silage Machine

As the key component of the silage machine,the harvesting efficiency and cutting quality of the header are definitely important assessment indicators.At the same time,the matching width with the tractor is also crucial to road safety.At present,the width of domestic silage machine headers is too narrow to meet the needs of high productivity,but large-width headers do not align well with the road regulations in China during road transfer;besides,the cutter is the most important part of the header,but there are few theoretical studies on the cutter system.In view of the above problems,taking the collapsible silage machine header as the research object to carry out the structural design of the whole system of the header,and analyze the static and dynamic characteristics of the cutter based on the ANSYS platform;Based on the analysis of the cutting path and speed characteristics of the rotary cutter of the header,this article optimized the geometric parameters of the cutter based on bionics.The main research work and contents are as follows:(1)Structural design of the header system.A hydraulic folding device was designed for the header with a cutting width of 4.5m and a vertical drum structure that can harvest 8 rows of silage corn at the same time;for different working conditions,a planetary gear reduction device,a step-by-step speed control transmission box,and a function Switch transmission box,drum drive and transfer dual-shaft cutting drum were designed.(2)Optimal design of cutting knife based on bionics.Using the cricket’s upper jaw incisor as a prototype,the cutting line of the upper jaw incisor was obtained and fitted by reverse engineering,and on this basis,the bionic cutting curve was optimized and integrated to solve the problem of sharp cutting tools existing in silage corn harvesting machinery in China.The problems of low degree and poor sliding cutting performance have been solved,and the cutting ability of the cutter has been significantly improved.(3)Analysis of the cutting trajectory and speed characteristics of the rotary cutter on the header and optimization of the cutter parameters.Simultaneously combined the velocity equation,mechanical equation and cutting distance equation of the rotary cutter head,and analyzed the relationship between the harvesting performance of the cutter and the working parameters with the dynamics simulation software.Taking blade height,cutterhead inclination angle and cutter-machine speed ratio as the influencing factors,conducted a three factor,three level quadratic regression orthogonal experiment by using the primary cutting rate,repeated cutting rate,and missed cutting rate as indicators to analyze the influence of each factor on the three indicators,and comprehensively optimized the influencing factors.(4)Static and dynamic characteristics analysis of cutter based on ANSYS platform.The research analyzed the static analysis of the four cutter models by using ANSYS software,of which the results showed that under close to real working conditions,the model optimized with bionic factors was improved in terms of stiffness and strength and could meet the mechanical performance requirements of use;a dynamic simulation model of the cutter display was established according to the corn harvesting process,and through the analysis of the straw cutting process,single factor experiments were conducted on the thickness of the cutter head and the blade angle of the cutter,and found the result that it is most suitable for cutting when the sliding angle of the cutter was 10° and the bionic cutter B is used.