*3.1. Effect of Moisture Content on Recovery Coefficient of Wheat*

The experimental data corresponding to various moisture content levels are presented in Table 3. From this information, a trend figure (Figure 3) illustrating the factors influencing single-factor water content on the recovery coefficient can be derived. The analysis reveals that under the test premise of employing Q235 steel as the collision material, maintaining material thickness at 4 mm, and setting the drop height at 180 mm, the recovery coefficient of wheat is significantly impacted by moisture content. As moisture content increases, the recovery coefficient progressively declines.

**Table 3.** Moisture content univariate experimental data.


**Figure 3.** Trend of recovery coefficient of factors influencing single-factor moisture content.

#### *3.2. Influence of Collision Materials on Wheat Recovery Coefficient*

Table 4 displays experimental data related to different collision materials. A bar chart depicting the recovery coefficient of single-factor collision material can be generated (Figure 4). Analysis indicates that when material thickness remains fixed at 4 mm and the drop height is set at 180 mm for the test, the recovery coefficient of wheat is notably affected by the collision material. The recovery coefficient for grain collision involving rubber material across four moisture levels is lower than that of Q235 steel, which can be attributed to the soft texture of the rubber and the partial absorption of collision energy.


**Table 4.** Single-factor experimental data of collision materials.

**Figure 4.** Single factor of collision material affects recovery factor.
