关键词: 苎麻, 剥麻机, 凹板, 纤维

Abstract: Aiming at the problem of difficult transportation of ramie stripping machine in mountain area, a light and compact single drum reverse pull stripping machine was designed by using the way that the power part and the stripping part of the whole machine can be quickly disassembled. Firstly, using stress analysis of fiber stripping process, it was determined that the inclination angle of feeding bucket was 30°. Secondly, from structural design and theoretical analysis of the hemp stripping drum, the key factors affecting the quality of fiber stripping and the range of operation parameters were determined. Lastly, response surface method was used to optimize the experimental design with drum speed, central angle of concave plate, and decorticating clearance as the influencing factors, and fiber percentage of fresh stem and ramie fiber impurity rate as the evaluation indexes. The results showed that the order of the factors affecting the fiber percentage of fresh stem was the decorticating clearance, central angle of concave plate and drum speed, and the order of the factors affecting the ramie fiber impurity rate was the decorticating clearance, drum speed and central angle of concave plate. The optimal parameters for ramie fiber stripping were determined in this paper: the drum speed was 956 r/min, central angle of concave plate was 38° and decorticating clearance was 2 mm. Based on the optimized parameters, the production verification test of ramie stripping was carried out. The results showed that the fiber percentage of fresh stem was 4.48%, the ramie fiber impurity rate was 1.03%, and the relative error between each index and the predicted value of the model was less than 5%.

Key words: ramie,  decorticator, concave plate, fiber