## 6 Conclusions  
1. To address the problem of the pneumatic seeder having poor ability to disturb the seed population in the seed-filling stage, which leads to serious leakage of suction phenomenon, a pneumatic disturbing seeder was designed. Firstly, the important parts of the seeder were parameterized and structurally designed, and the seed-filling process of the seeder was dynamically analyzed according to the theory of mass dynamics. Secondly, the key factor affecting the seed-filling process of the seeder was obtained as the initial velocity \(\
u_{0}\) of the seed population, and the absolute acceleration a of cabbage seed relative to the ground was inversely proportional to the initial \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Test Number**} & \multicolumn{2}{c}{**Suction Compliance Rate**} & \multicolumn{2}{c}{**Leakage Rate**} \\ \cline{2-5}  & \(\mathbf{A_{2}B_{2}C_{3}D_{1}}\) & \(\mathbf{A_{2}B_{2}C_{3}D_{3}}\) & \(\mathbf{A_{2}B_{2}C_{3}D_{1}}\) & \(\mathbf{A_{2}B_{2}C_{3}D_{3}}\) \\ \hline
1 & 95.19 & 96.91 & 3.62 & 2.85 \\
2 & 95.10 & 94.87 & 3.54 & 3.23 \\
3 & 95.08 & 94.45 & 3.02 & 3.31 \\
4 & 94.67 & 94.73 & 3.24 & 3.21 \\
5 & 94.84 & 95.64 & 3.22 & 2.94 \\ average value & 94.98 & 95.32 & 3.34 & 3.11 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Seed-filling performance verification test results. Figure 11: Seeder leakage in seed-filling performance tests. (**a**) Flat disk, (**b**) circular serrated disk, (**c**) linear serrated disk. velocity v\({}_{0}\) of cabbage seeds. When the initial velocity v\({}_{0}\) of cabbage seeds is larger, the absolute acceleration of a cabbage seed relative to the ground obtained in the seed filling stage is smaller. Ultimately, it was found that the negative pressure adsorption force required to adsorb cabbage seeds in the air chamber was less under the same operating conditions. 2. The plane disk, arc-shaped serrated disk, and linear serrated disk, are three kinds of seed discharge disks. Based on EDEM simulation to carry out the simulation test of the population perturbation ability, the simulation results show that when the seed discharge disk began to rotate, whether it is the average speed of the population or the frequency of the population perturbation and the degree of concern, the linear serrated disk is better than the plane disk and arc-shaped serrated disk. It was proved that the linear serrated disk can effectively perturb the cabbage seeds sufficiently during the seed-filling process, thus reducing the leakage rate of the seeder. 3. Based on theoretical analysis and simulation, a four-factor, three-level orthogonal test of seed-filling performance was carried out on the pneumatically disturbed seed expeller with the qualified rate of seed suction and leakage rate as the evaluation indexes, and the style of seed expulsion disk, the rotational speed of seed expulsion disk, the value of negative pressure of the blower, and the diameter of the typed hole, as the factors. Through the analysis of polarity and ANOVA, the factors affecting the seed-filling rate were, in order of priority, seed expeller style A > fan negative pressure value C > seed expeller rotational speed B > hole diameter D, and the optimal parameter combination was A\({}_{2}\)B\({}_{2}\)C\({}_{3}\)D\({}_{3}\). The factors affecting the leakage rate of seed filling were, in order of priority, seed expeller style A > fan negative pressure value C > seed expeller rotational speed B > hole diameter D, and the optimal parameter combination was A\({}_{3}\)B\({}_{3}\)C\({}_{3}\)D\({}_{1}\). Careful consideration of the best performance of the seed dispensers' seed-filling performance was the combination of working parameters A\({}_{2}\)B\({}_{2}\)C\({}_{3}\)D\({}_{3}\), its experimental verification of the seed dispenser at this time, with a suction seed qualification rate of 95.32%, and leakage rate of 3.11%. The test results meet the agronomic requirements of cabbage seed sowing. Conceptualization, X.L. ; methodology, Y.T. ; software, X.L. and Z.L.