Abstract: Aiming at the problems of insufficient separation of potato and soil as well as high injury rate of potato in potatosoil separating and conveying device for potato harvester, an innovative design of potatosoil separating and conveying device assisted by TRIZ theory was carried out. Based on the analysis of systematic function, the functional defects of the potatosoil separating and conveying device were identified. A set of TRIZ tools including sufield model, technical contradiction, and physical contradiction were applied to seek innovative solutions. A potatosoil separating and conveying device with a double jitter unit and downwardmotion jitter screen surface was designed. Through the mechanical analysis of the mixture of potato, soil and vine on the conveying screen surface, the angle range of tilt of sieve surface was defined to be β≤32°. Combined with theoretical analysis and production practice, the angle of firstorder ascending sieve surface was 20° while the secondorder one was 16°, and the angle of descending sieve surface was 10°. The amplitude of jittering unit was 21 mm, the spacing of separating sieve rod was 50 mm, and the effective conveying lengths of sieve surfaces of each stage were 450 mm, 600 mm, 1 000 mm and 100 mm respectively. Via the kinematic analysis and comparison of the jitter screen surface including ascending as well as descending separation screen, the rationality of the innovative scheme was verified.

Key words: potato harvester, potatosoil separation, conveying equipment, TRIZ

摘要： 针对马铃薯收获机薯土分离输送装置存在薯土分离不充分、伤薯率高等问题，应用TRIZ理论对薯土分离输送装置进行创新设计；基于系统功能分析识别薯土分离输送装置的功能缺陷，应用物场模型、技术矛盾、物理矛盾等TRIZ工具求解创新方案，设计一种具有双抖动单元和降运抖动筛面的薯土分离输送装置。基于输送筛面上薯土秧混合物的力学分析，确定筛面倾角范围为β≤32°；结合理论分析和生产实际确定一阶升运筛面倾角为20°、二阶升运筛面倾角为16°、降运抖动筛面倾角10°、抖动单元振幅为21 mm、分离筛杆条间距为50 mm、各阶筛面输送有效长度分别为450 mm、600 mm、1 000 mm 和100 mm。通过升运分离筛和降运分离筛抖动筛面的运动学分析对比，验证创新方案的合理性。

关键词: 马铃薯收获机, 薯土分离, 输送装置, TRIZ