关键词: 水稻泥浆机, 育秧技术, 泥浆泵, 正交试验

Abstract: In view of the shortage of nutrient soil for rice seedling raising in the market，a mud machine is designed to treat paddy mud. The treated mud can be used as a natural nutrient soil carrier. The kinematic mathematical model of the mud pump is established，and the motion trajectory and law of the mud pump rotor are studied and analyzed. The results show that the center of the rotor section of the mud pump moves in a straight line，and the motion trajectory of the rotor surface points presents an ellipse on the plane. The three.dimensional virtual prototype model of the mud pump is established and the kinematics simulation of the mud pump is carried out. The results show that the motion trajectory of different fixed points on the rotor surface of the mud pump is a three.dimensional motion in space，which is an ellipse in the plane. The maximum error between the speed simulation of different fixed points on the rotor surface and the mathematical model is 7. 8%. Orthogonal experiments were carried out on the eccentricity parameters，equidistant radius parameters and rotational speed parameters of the mud pump to find the best combination parameters. The optimal parameters of the mud pump are as follows：eccentricity is 7. 6 mm，isometric radius is 24 mm，and speed is 680 r/min. Field test results show that the mud conveying distance can reach 50 m，1 500 rice plates can be filled every hour，and the mud flow rate is 6-8 m3/h. 

Key words: rice mud machine；seedling rearing technology；mud pump；orthogonal test