| Inner Mongolia region is the main com planting area.Corn straw is rich in resources and rich in nutrients available to livestock.The yellow storage forage harvester can realize the combined operation of cutting,picking up,throwing,feeding and loading straws into a whole.The straw can be crushed and kneaded into filamentous materials which are beneficial to livestock digestion,thus greatly promoting the fodder utilization of straw resources.However,due to the poor reliability and stability of the main components of the yellow storage forage harvester and the high production cost,the popularization and application of the machine are restricted.Therefore,it is of great significance to optimize the design of key components of yellow storage forage harvester to improve the utilization rate of straw forage and promote the development of animal husbandry industry in the autonomous region.In view of this,this paper takes 9HS-170 yellow storage forage harvester as the research object,and optimizes the design of key components in order to improve the reliability and stability of components and improve the working performance of the machine.ANSYS workbench and ADAMS software are used to carry out static,kinematic and modal simulation analysis on the cutting drum,and field tests are carried out on the improved prototype according to relevant national standards.The main work and achievements are as follows:1.Through theoretical analysis,the structure of the cutting drum was improved and designed,and the structure and motion parameters of the flail,the rotary diameter of the drum and the arrangement of the flail were determined.Optimize the transmission ratio of all levels in the transmission system,and design the clutch structure to ensure the smooth start-up and operation of machines and tools;A steering adjusting device for the throwing drum is additionally arranged to improve the convenience of operation of the throwing drum.2.SolidWorks software is used to carry out three-dimensional modeling of the improved machine,and ANSYS workbench software is used to carry out statics and modal simulation analysis of the cutting drum.The simulation results show that during operation,the maximum stress of the swing knife is 132.44MPa at the edge of the pin shaft hole,which meets the allowable stress requirement of the material.The maximum displacement deformation of the cutting drum is 0.1296mm,which is located near the top of the flail blade.The first-order natural frequency fl of the cutting drum is 61.494Hz,and the lowest resonance speed is 3690r/min,which is much higher than the actual rotation speed of the cutting drum,thus effectively avoiding resonance phenomenon.3.The ADAMS software is used to simulate and analyze the motion track of the cutting drum flail knife and determine the better working parameters.The results show that when the rotation speed of the cutting drum(1033r/min)is constant and the forward speed of the machine is 4km/h,the motion trajectory of the flail knife is a better trochoid.At this time,there is no missing cutting area,the re-cutting area is also smaller,and the stubble cutting is more orderly.4.The field test results showed that the standard straw length rate was 88.3%,the harvest loss rate was 2.6%,the noise was 89db(A),the moisture content was 16.44%,the average stubble cutting height was 135.7mm,and the average crop diameter was 23.17mm,all of which met the requirements of the relevant national standards for straw feed harvesters. |
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