Abstract:The transplanting synchronous puncher with preventing clogging developed by Northeast Agricultural University was used mainly in rice transplanting on the mulch by utilizing physical punching method, which can realize efficient of transplanting. In order to achieve that the transplanting machine completed job mode of laying of fibrous mulch film, opening, and transplanting in a process and solve the problems of root injury and stoppage of device when transplanting on the mulch, the development of a transplanting synchronous puncher with preventing clogging was absolutely necessary. On the basis of the arm-distributing mechanism of the gear rotating box, a single-arm opening device with a “+” shape point was added. Based on analysis of the cooperating relationship among three systems (gear transmissions, planting arm and synchronous puncher), planting arm was selected as research object to establish a mathematical model of synchronous puncher by analyzing the kinematic process between claw and mulch. Using the established model for simulation, the main factors affecting the quality of the opening were determined, and the feasible range of the difference between the phase angle of the opening and the insertion was verified. Using the quadratic orthogonal rotation center combination test method, the difference between phase angle of opening and insertion, the inclination angle of opening and rotation speed of rotating box were taken as the test factors, and the length of the film hole, length of opening before insertion, and pass rate of opening were evaluated. The results showed that when the difference of the phase angle between the opening and transplanting was 8.0°, the inclination angle of the opening was 7.0°, and the rotation speed was 246.4~250.1r/min, there was no blockage in the opening device. The average length of membrane hole, the average width of membrane hole, the average length of opening before transplanting were 47.3mm, 16.6mm and 18.0mm and the average qualified rate of membrane hole was more than 94%. Based on the results of parameter optimization test, the anti-blocking performance and perforation performance of the anti-blocking film-covered synchronous opening transplanting device and the “H” synchronous opening transplanting device were compared. The perforation device designed was superior to the “H” type perforation device before improvement, and it met the agronomic requirements.
