Abstract： To complete the straw briquetting operation in the field， a movable straw briquetting machine driven by 75 kW wheeled tractor was designed. The production tests were performed on the movable rice and wheat straw briquetting machine with rice straw as raw material. According to the experimental results， the effect rules of craft parameters on the straw briquetting of briquetting machine were analyzed to obtain optimal parameter combination. A central composite rotatable orthogonal experiment design of response surface methodology was employed to find the optimum technical parameters.Straw compact density and productivity were selected as responses, and feed roll speed, impeller shaft speed and mainshaft speed were used as input variables with four levels respectively. Variance analysis and response surface analysis were applied to analyze the test results by DesignExpert 8.0.6. The mathematical model was established to analyze the effect of three factors on test indexes.The results show that the effecting decreasing sequence on straw compact density is mainshaft speed ,impeller shaft speed and feed roll speed,while the effecting decreasing sequence on productivity is feed roll speed , mainshaft speed and impeller shaft speed. When the feed roll speed is 125.84 r·min-1 with impeller shaft speed of 776.05 r·min-1 and mainshaft speed of 169.16 r·min-1 ，the straw compact density mean is 1.153 g·cm-3 with the productivity of 1 135.87 kg·h-1，which can meet the requirements of straw briquetting.
2019, Vol. 40 
