关键词: 黄花苜蓿收获机, 关键部件, 响应面分析, 参数优化

Abstract: In view of the difficulty, high cost, and low efficiency of Medicago falcata L. harvesting on a large scale, this paper presents a walking, selfpropelled Medicago falcata L. harvester design that can realize the harvesting and collection of Medicago falcata L. The overall structure of the machine was introduced, and the key components such as cutting device, collecting device, and transmission device were designed. The designed blade pitch was 34 mm, the stroke of a single moving blade was 17 mm, the cutting power consumption was 1.175 kW, the fan power consumption was 0.124 3 kW, the main air duct size was 30-50 mm, the branch pipe was 15-25 mm, and the motor power was 2.2 kW. In order to test the performance of the machine, field operation tests were carried out based on response surface analysis method. The results showed that the optimal operation parameters of the machine were: working speed 0.72 m/s, cutting speed 0.78 m/s, conveying speed 1.29 m/s, working efficiency of the harvester 0.091 2 hm2/ h, and the rate of missed cutting was 1.75%. The factor contribution rate of each factor to work efficiency was blowing speed>cutting speed>operation speed. The factor contribution rate of each factor to missed cutting rate was cutting speed>operation speed>blowing speed. All indexes meet the design requirements and can realize stable and efficient operation.

Key words:  Medicago falcata L. harvester, key components, response surface analysis, parameter optimization