Abstract:In order to solve the problems such as poor recovery effect of the tillage layer residual film recovery machine and incomplete separation of key components of the crushing device due to the excessive film-stubble soil complex, a crushing device for the tillage layer residual film recovery machine was designed. The soil-lifting baffle and the crushing roller form a one-time crushing film-stubble-soil complex, meeting the technical requirements of agronomy and agricultural machinery for the tillage layer residual film recovery machine. Through dynamic analysis, it was determined that the instantaneous velocity of the earth-lifting baffle during the throwing and crushing process was 35.5m/s and the time taken during the throwing and crushing process was 0.75s. In order to optimize the structural parameters of the crushing device, the upper jaw teeth of the arch-back ant were used to design the crushing roller. Combined with the discrete element software Rocky, a three-factor three-level quadratic regression orthogonal test was conducted on the rotational speed of the upper and lower rollers of the crushing roller and the height difference between the centers of the upper and lower rollers. The optimal parameter combination was obtained as follows: the rotational speed of the upper roller was 425r/min, that of the lower roller was 395r/min, and the height difference between the centers of the upper and lower rollers was 50mm. The bench test showed that the material crushing rate of the plough layer residual film recovery machine was 96.6%, and the soil content was only 6%. Compared with the simulation test, the error was less than 2%. Field experiments showed that the recovery rate was 95.6% and the crushing rate was 94.4%. The simulation theoretical results were verified, and the passability of the equipment was significantly improved. The research results can provide a basis for the development and improvement of the plough layer residual film recovery machine.
