Design And Finite Element Analysis Of Roller Shredding Mechanism For Silage Maize Harvester

As one kind of high quality ensilage green fodder, corn silages have the vital significance for the development of animal husbandry. On the basis of study of straw stalk cutting theory and experiments domestic and abroad, the article analyzes rotation angle, pushing angle and friction angle of blade cutting, establishes relations of slippery tangential angle and design parameter above by mathematical analysis, obtains biggest radius of gyration, cylinder length and disposition altitude of blade according to the silage corn harvest's actual request, also designs working parts and structure size of roller shredding mechanism for Silage maize harvester.By what discussed above I analyze important working parts force such as blades, axis ,cylinder and so on, carry on the static or dynamic characteristic analysis with the finite element method and ANSYS software.1. The finite element analysis of blade shows that both cutting edges of the blade develop stress concentration and serious deformation, area near the bolt hole emerge obvious stress concentration and the distribution. By comparing the blade force and deformation pattern with various bolt-hole number and site through finite element analysis, and comparing blade with the theoretical design, the conclusion is found: the structure size of theoretical blade design is more reasonable.2. The finite element analysis of the spindle and the key joint which impetus cylinder revolving shows that centrifugal force causes presents the radial clearance between the spindle and the bushing joint surface. Because of biased revolving, radial direction deformation and displacement are inhomogeneous, the gap produced by the spindle revolving will increase cylinder vibration, affect its cutting quality and the security.3. The finite element analysis of the spindle and the key interference fit joint belongs to nonlinear contact analysis, keyway stress concentration is more obvious when they transmit torque, which shows keyway position is easier to be distorted and damaged.4. Spindle's dynamic characteristic is mainly decided by the minority low-order mode, by analyzing low-order frequency vibration chart, spindle's low-order frequency assumes the trend of escalation and causes the entire cylinder system's dynamic characteristic to be more improvement; when the spindle speed enhances, and simultaneous analyzes also shows spindle 's dynamic characteristic influence greatly by spindle's restraint way, low-order frequency of both sides spindle support is higher than one side, which explains that proper support way has the effective improvement to spindle's vibration.The finite element analysis has proved the theoretical analysis conclusion is reasonable-structure size of working parts for roller shredding mechanism for silage maize harvester is reasonable in the light of theory. This thesis unifies the traditional machine design and advanced modern design method, enhances the machine design efficiency, enables computer technology to obtain full display in the process of machine design.