# Analysis and Test of the Tillage Layer Roll-Type Residual Film Recovery Mechanism
## 4 Conclusions  
1. Through the analysis of the working principle of the roller-type plow layer plastic film collector, it could collect the plastic film residue within the plow layer depth of 150 mm [25; 28]. The roller-type plastic film collector could effectively separate the plastic film residue from the soil and stubble mixture by using the spring-tooth and the film-soil mixture falling in the same direction. Moreover, the spring-tooth speed was greater than the falling speed to reduce the reaction force of the soil on the residual film in the process of picking up the film by the spring-tooth, overcome the problem of poor mechanical properties of the plow layer residual film, and improve the operation performance of the plow layer residual film recovery mechanism.
2. According to the kinematics and dynamics analyses of the roller-type mulich film collector in the process of picking up and unloading the film, the rotating speed of the film-picking knife was 22.37 rad/s, the rotating speed of the picking roller was 4.58 rad/s, the forward rotation speed of the roller for picking up the film was 13.74 rad/s, and the reversing unloading speed of the roll was 17.57 rad/s. The rotation speed of the film-unloading wheel was 4.5 rad/s, which provided theoretical guidance for the design of the operation parameters of the roller-type plow layer plastic film collector.
3. By simulation, the analysis showed that the gap between the spring-teeth of the winding roller-type recovery mechanism was smaller during the film-picking operation, which was conducive to picking up small residual films. During the unloading of the film, the working width between the spring-tooth tips was larger, which provided a guiding basis for the position and parameter design of the film-unloading wheel. The movement of the roller-type plastic film recycling mechanism met the design requirements, which could complete the operation process of the roller-type plastic film recycling mechanism in the film collection area and in the film discharge area. Moreover, the plastic film could be effectively recycled in the plow layer, which provided theoretical guidance for the design of the roller-type plastic film recovery mechanism.
4. Through the bench test, the operating depth of the roller plow residual film recovery machine reached 150 mm, the tillage gathering rate was 71.6%, and the surface gathering rate was 83.4%. All the test indexes met the requirements of the national and industry standards, the test results met the design requirements, and the results of experiments were consistent with the simulation analysis results.  
Conceptualization, Z.S. and X.Z.; methodology, J.Y. and Z.S.; software, X.L. and L.G.; validation, J.Y.; formal analysis, Z.S.; investigation, X.Z., Z.S. and J.Y.; data curation, Z.S.; writing--original draft preparation, M.K.; writing--review and editing, Z.S. and M.K.; visualization, X.L.; supervision, X.Z. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the National Natural Science Foundation of China (52105278), the Xinjiang Autonomous Region Tianshan Youth Plan Project of China (2020Q015), and the Xinjiang Agricultural Machinery Integration Project (YTHSD2022-10).  
Not applicable.  
Data Availability StatementAll relevant data presented in the article are stored according to institutional requirements and, as such, are not available online. However, all data used in this manuscript can be made available upon request to the authors.  
The authors thank the editor and anonymous reviewers for providing helpful suggestions for improving the quality of this manuscript. The authors declare no conflict of interest.