Design And Experimental Study Of Flexible Hammer Claw Corn Delivery Device

The corn harvest in the Huanghuai Sea is still the main problem of the harvest,and the loss is difficult.It has become a major problem that plasmunicates farmers.The grain straight income technology can save the threshing,drying the link,can reduce labor Intensity,reducing losses,is a key technique for increasing farmers’ income and achieving full mechanical production of corn.However,in the two mature districts of Huanghuai Hai,in order to ensure that the winter wheat is not affected,the corn is generally harvested,the water content is high,the existing corn grain direct closing operation is high,affecting the postpartum storage and processing quality,less application,serious Hold the development process of corn harvest full mechanization.In response to the above problems,this study has been based on foreign mature longitudinal corn separation technology as the research foundation to reduce the loss of corn grains,and improve the harvest quality.This study analyzes the reasons for the high crushing rate of the existing threshing device,and designs a flexible hammer claw threshing device.Through the analysis of threshing and separation principle and the simulation of threshing process,the structural parameters of the device are determined and optimized,and combined with single factors,orthogonal tests are combined with optimal structural parameters and working parameters,and the threshing verification test is carried out to optimize the suitable machine harvest varieties,the technical reference is improved for the low loss harvesting of corn grains in two mature zones.The main research contents are as follows:(1)The moisture content and hardness of 10 maize varieties were measured for ten consecutive days during the maturity period,the variation laws of maize moisture content and grain hardness with time were analyzed,and the relationship between grain hardness and moisture content was determined.Taking the moisture content,hardness and compressive characteristics as indicators,the suitability of machine harvesting of different varieties of maize was evaluated,and the varieties suitable for machine harvesting were selected.(2)On the basis of analyzing the traditional threshing separation device,the innovative design of the flexible hammer claws was designed.,the material and structure of the threshing element were theoretically analyzed,and the parameters of key components such as drum,threshing concave and gap adjustment mechanism were designed based on Hertz contact theory,the threshing movement process of hammer claw and corn ear were studied,the stress analysis model of flexible hammer and ear was established,the stress process of ear was clarified,the material and structure of hammer claw were optimized,and the test-bed of flexible hammer corn threshing and separation device was developed.(3)Based on EDEM,the ear contact and collision process was simulated,the ear motion state and collision force were analyzed,the mechanism of hammer claw threshing element to reduce grain crushing rate and non threshing rate was clarified,and the optimal working range of drum speed,feeding amount and other parameters was determined,so as to provided reference for subsequent bench test.(4)A single factor test was performed on the flexible hammer clawed separation device,determined the optimal operating range of parameters such as threshing roller speed,feeding amount,thorn gap,and hammer claw combination type,with a thilled roller rotation,thorn gap and The hammer claw combination type was a test factor,with the fracture rate and the unleurized rate of trial,three-factor three-level secondary regression orthogonal test,used the extract and variance analysis to analyze the test results,the results showed: In the case of 33.67% water content rate,the best combination of the threshing device was a roller rotational speed of 450 r / min,a threshing gap 40 mm,a hammer claw combination type of a flat head + round head hammer,which combined with a combination of grain breakage and unsubstreated rate can be controlled.Within a preferred range,the grain breakage rate was 4.13%,and the unseained rate was 0.56% to meet the national standard requirements.