Performance analysis and test of shaftless double helix fertilizer feeding device for lotus root fertilizer applicator
In response to the problems of high labor intensity, low fertilization stability and uniformity in the process of lotus root fertilization, a hydro-jet lotus root fertilizer applicator was designed, which was mainly divided into fertilizer supply device and water-fertilizer mixing device, and the shaftless double screw fertilizer supply device was mainly designed and analyzed. The theoretical analysis determined that the main parameters affecting the fertiliz-er supply performance were screw speed, diameter and pitch, and the range of values of these three parameters was determined according to the agronomic requirements for fertilizer application in root fields. The discrete element sim-ulation analysis of the fertilizer supply performance of the shaftless double helix was carried out by EDEM, and the single-factor test and the regression orthogonal rotating combination test were carried out to evaluate the mean value of fertilizer supply and the coefficient of variation of fertilizer supply stability, respectively. The results of single-factor test showed that: the average value of fertilizer supply increased with the increase of screw speed, diameter and pitch, and had a good linear relationship, so the average value of fertilizer supply could be changed by adjusting the screw speed, diameter and pitch of fertilizer supply; the coefficient of variation of fertilizer supply stability showed a trend of decreasing and then increasing with the increase of screw speed and pitch, and decreasing with the increase of diame-ter. Design-Expert software was used to analyze and optimize the results of the regression orthogonal rotational com-bination test, and the optimized parameters were verified by simulation test and bench test, respectively. The results showed that when the screw speed was 160 r·min-1, the screw diameter was 78 mm and the screw pitch was 53 mm,the mean value of fertilizer supply was 329.43 g·s-1 and the coefficient of variation of fertilizer supply stability was 1.43％ in the simulation results and 341.32 g·s-1 and 2.34％ in the bench test results, respectively, which met the agro-nomic and fertilizer supply stability requirements of the root field. The study can provide a reference for the design optimization of the spiral fertilizer supply device and the mechanized fertilization of the root field.
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