Research on design and performance of spoon-wheel type broad bean seed metering device
In order to improve the mechanized seeding rate of broad bean,a scoop-wheel type broad bean seed metering device with a simple structure was proposed,and the effects of different seeding speeds and types of seeds on the seeding performance were analyzed.Firstly,the structure and working principle of the scoop wheel seed metering device were introduced.The outline dimensions of broad bean seeds were statistically analyzed and divided into three types(small,medium and large seeds).The structure of broad bean seed metering scoop was designed.The seed picking process,seed clearing process and seed propagation process of the seed metering device were theoretically analyzed.Secondly,using EDEM software to simulate the working performance of the seed metering device,the simulation model of the seed metering device and three kinds of broad bean seeds was established.Finally,a bench test was carried out to verify the feasibility of the spoon-wheel type broad bean seed feeder with the qualification index,replay index and missing sowing index as the evaluation criteria.The results showed that the horizontal inclination of the actual filling line of broad bean seed was positively correlated with the rotation speed under the simulation environment.The optimum seeding speed was 10 r/min,and the seeding performance index of medium seed was the best.The seeding qualification index was 90.3％,the replay index was 6.9％,and the missing seeding index was 2.8％.When the seeding speed was 10 r/min,the comprehensive seeding performance of the simulation test was as follows:qualified index 89.5％,replay index 6.25％,miss seeding index 4.25％,and the comprehensive seeding performance of the bench test was as follows:The qualified index was 89.2％,the replay index was 7.1％,and the missed sowing index was 3.7％,which were basically consistent with the simulation results,meeting the requirements of broad bean seeding and verifying the feasibility of the spoon wheel type broad bean seeding device.
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