Design and Experiment on Shoveling Device of Pig Manure Organic Fertilizer by Hermetia illucen Transforming Based on Bucket-wheel Mechanism
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    Abstract:

    Aiming at the problems of high labor intensity in the collection and transportation forpig manure organic fertilizer by Hermetia illucen transforming, based on the process flow of Hermetia illucen breeding and the physical characteristics of organic fertilizer, a bucket-wheel shoveling device was designed. To improve the mean mass shoveled by hopper and reduce the coefficient of variation between each hopper, single-factor test was used to get the best form of the bucket-wheel mechanism. The Box-Behnken central composite experimental design principle was adopted on the basis of single factor experiment to research the working parameters of the shoveling device. The moving speed of bucket-wheel, rotation speed of hopper, and number of the hopper were taken as the influencing factors, the mean mass of organic fertilizer shoveled by thehopper and coefficient of variation were selected as the responsive variables. The results showed that the mean mass of organic fertilizer shoveled by the hopper and coefficient of variation could be fitted with two regression polynomials. According to the rate of factors contribution, the results indicated that the rotation speed of hopper had the greatest effect on the mean mass of organic fertilizer shoveled by the hopper and coefficient of variation among the three selected main factors followed by counterweight position, and moving speed of bucket-wheel had the minimum effect. Taking the maximum average mass of organic fertilizer shoveled by the hopper and the smallest coefficient of variation as the optimization goal, the optimal operating parameters of the machine was obtained: the moving speed of bucket-wheel was 65mm/s, the rotation speed of hopper was 8.25r/min and number of the hopper was 3. At this time, the theoretical values of mean mass of organic fertilizer shoveled by the hopper and coefficient of variation were 4.008kg and 3.19%, respectively. Based on the optimization result, the physical prototype was processed. The test results showed that the mean mass of organic fertilizer shoveled by the hopper and coefficient of variation were 4.236kg and 3.37%, respectively. The relative errors between the experimental and predicted values of average mass of organic fertilizer shoveled by the hopper and coefficient of variation were 5.38% and 5.34%,respectively. The results indicated that the multivariate regression model was reliable.

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History
  • Received:November 30,2020
  • Revised:
  • Adopted:
  • Online: February 10,2021
  • Published: February 10,2021
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