| Deepwater rice,also known as "reed rice",is a new generation of rice varieties used for rice and fishery comprehensive cultivation.Planting deep-water rice in deep-water paddy field can purify water quality,improve aquatic product quality,promote rice quality,realize "promoting cultivation and increasing grain",and achieve good ecological,economic and social benefits.At present,the harvest of deep rice in our country generally adopts artificial harvesting and mechanical harvesting.Manual harvesting is not only labor-intensive,but also has high labor cost.Mechanical harvesting technology is not mature enough.Currently,water and grass harvesting ships are mainly used for harvesting,which has low production efficiency and relatively messy harvesting,which is not convenient for the follow-up treatment of deep rice.Aiming at the working environment of harvesting deep rice,this paper mainly solves the problems of low efficiency and disorderly harvesting of deep rice with the existing aquatic grass harvester,and designs a boat-type harvesting platform that can achieve efficient and orderly harvesting of deep rice.The main research contents of this paper are as follows:(1)The material characteristics of deep rice stalks were experimented,and the friction characteristics between the rice stalks and the clamping conveyor belt,as well as the critical damage force and the maximum shear force of the rice stalks were explored,which provided a theoretical reference for the design of the key components of the device.(2)According to the requirements of the harvest operation,the overall design of the harvesting device is determined.The design adopts a reciprocating cutting device,a chain finger-pulling mechanism,a double-belt clamping conveyor device and a movable cutting platform with adjustable height.The theoretical analysis and design of the key components and the determination of relevant parameters are carried out.The kinematics analysis of the transmission mechanism of the cutting device was carried out,and the mathematical motion model was obtained.The motion simulation analysis of the transmission mechanism was carried out by using ADAMS software,and the rationality of the mechanism design was verified.(3)The three-dimensional model of the harvesting device was established.The ANSYS Workbench was used to conduct static analysis on the support frame and the cutting table frame to verify the rationality of the frame design and optimize the structural parameters of the cutting table frame.The minimum natural frequency of the cutting table frame was obtained by modal analysis,so as to avoid the resonance between the cutting table frame and other mechanisms in the working process.(4)the final completion of prototype test,the optimal parameter combination in order to get the machine,cutter speed,machine speed,clamping conveyer Angle as the test factors,the single factor test and the multi-factor orthogonal experiment of three factors three levels,get the factors impact on the cut stem leakage rate and the transmission loss of significance,the best parameter combination of the test results show that this device is: The cutting speed is 1.2m/s,the forward speed is 0.4m/s,and the inclination Angle of the clamping conveying device is 20°.At this time,the measured culm leakage rate is 3.3%,and the conveying loss rate is 6.5%,basically meeting the working requirements. |
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