Abstract:Aiming at the existing problems in the field test of the primary 4MB-6 row-controlled shoveling and drawing placement machine for cottonstalks in close planting, such as severe soil hilling in the drag reduction device, cottonstalks accumulation in the rowcontrolled shoveling device, discontinuous operation and poor effectiveness of drawingplacing roller and so on, the primary machine were improved. In order to further improve the performance of machine, the working mechanism of main working parts should be analyzed. Adopting the technique of discharging furrow slice insitu and interval operation and when shoveling depth of the rowcontrolled shoveling device was about 11.5cm, the virtual and actual operation ratio of shoveling at bottom and surface was 1∶2.42 and 1∶0.59 respectively that was a continuous decreasing trend from the ground to the bottom, which was helpful to reduce operating power consumption of the machine. Under extrusion and shearing of shoveling plate and side panel with blade of trapezoid frame, the soil around soilroot composite were damaged by shearing and bending and soilroot composite were also damaged and uplifted insitu in upper soil during the process of shoveling, and the rowcontrolled shoveling device had little disturbance to the rest of the soil. The principle of reverse pushing and drawing was adopted when designing the pushingdrawing roller with tooth type. As the diameter of the main part of the cottonstalks was gradually increased from top to bottom, it was helpful to introduce the cottonstalks into Vshaped cutter and clamp the cottonstalks effectively. In addition, because the cottonstalks that would be pulled up was shoveled and lifted, and working depth of the pushingdrawing roller (0~10mm) was small, which both were helpful to further reduce the power consumption of whole machine. The results of field test showed that the improved machine had stable operation performance compared with the primary one. The rowcontrolled shoveling device could work smoothly and achieve the goal of rowcontrolled shoveling and uplifting insitu cottonstalks. The pushingdrawing roller with tooth type could clamp the cottonstalks effectively and separate the soil from soilroot composite when throwing cottonstalks tangentially, and it could also spread cottonstalks in the field. The pulling rate of the improved machine was 90.87%~91.42%, which could meet the design requirements of shoveling and drawing cottonstalks (the pulling rate should be greater than or equal to 90%). It was a suitable equipment for mechanized harvesting of the cottonstalks in Xinjiang cotton area.