## 4 Simulation Analysis of the Chain-Drive Film-Soil Separation Mechanism
### Analysis of the Results  
The simulation analysis showed that the shaking displacement of link_1 in the tensioning zone of the chain was in the range of 27-726 mm in the x-direction, and the trajectory of link_1 in this zone basically varied in a cosine curve, indicating that the results of the kinematic analysis of the theoretical analysis of the chain drive film-soil separation mechanism were consistent with the results of the simulation analysis. The maximum and minimum values of the velocity of the link_1 center of mass in the x-direction and y-direction did not appear in the time period of 0.52-0.56 s when the jitter rollers were in contact with link_1 for the displacement of link_1 in the x-direction in the range of 27-726 mm. In the time period of 0.52-0.56 s, the velocity changes in the x-direction and y-direction were flat. However, when the shaking roller and link_1 were not in contact, the flexible characteristics of the chain were used to drive its movement in the x- and y-directions, and the movement speed in the y-direction was faster than that in the x-direction, which was conducive to the shaking separation of the film-soil mixture. The maximum and minimum values of acceleration in the x-direction of link_1 occurred before 0.52 s, while the maximum and minimum values of acceleration in the y-direction occurred exactly between 0.52 s and 0.56 s. The overall acceleration in the x-direction was greater than that in the y-direction. According to [PERSON]'s second law, when the shaking roller is in contact with link_1, the force in the y-direction is the greatest, which has an upward impact on the soil clods to break them and increase the film collection rate. When the shaking roller is not in contact with link_1, the force in the x-direction is the greatest, which has a stronger effect on the backward transport of the soil mixture and is less likely to produce film congestion. To further the film-soil separation performance of the chain drive film-soil separation mechanism, the data in Figures 14 and 15 were exported using the table function of Exportto form a velocity variation graph with the velocity of link_1 in the y-direction as the vertical axis vs. the velocity of link_1 in the x-direction on the horizontal axis, as shown in Figure 16.  
To analyze the velocity variation of link_1 within the effective jitter band between 27 mm and 726 mm, combined with the fact that the velocity variation is divided into two trends, upward and downward, as shown in Figure 16, the velocity variation Equation (11) was constructed as shown in Figure 17.  
\[ \begin{cases}v_{x}{{}^{\prime}}-v_{x}=\
abla v_{x}\\ v_{y}{{}^{\prime}}-v_{y}=\
abla v_{y}\end{cases}  \tag{11}\]  
where \(\left(v_{x},v_{y}\right)\) is the velocity at any point on the velocity change curve (mm/s), \(\left(v_{x}{{}^{\prime}},v_{y}{{}^{\prime}}\right)\) is the velocity at the point on the velocity change curve after the relative \(\left(v_{x},v_{y}\right)\) (mm/s), \(C=\frac{m_{2}}{m_{1}}\times 100\) is the velocity difference in the y-analysis, (mm/s), and \(\
abla v_{x}\) is the velocity difference in the x-direction (mm/s). When \(\frac{\
abla v_{y}}{\
abla v_{x}}=1\), the chain drive film-soil separation mechanism has the same effect on the horizontal and vertical transport of the film-soil mixture. When \(\frac{\
abla v_{y}}{\
abla v_{x}}>1\), the chain drive film soil separation mechanism has a greater effect on the vertical transport of the film-soil mixture than the horizontal one. When \(\frac{\
abla v_{y}}{\
abla v_{y}}<1\), the conveying effect of the chain drive film-soil separation mechanism on the film-soil mixture in the horizontal direction is greater than that in the vertical direction. After analysis, the maximum value of \(\frac{\
abla v_{y}}{\
abla v_{x}}\) was 93.65, corresponding to a velocity difference of 30.2 mm/s in the x-direction and 2.83 \(\times\) 10\({}^{3}\) mm/s in the y-direction.