TRIZ theory is a way to solve the problem of innovation, it is used to solve the conflict problem of technology in the design by innovation. The article which adopts contradictions in the technical theory of TRIZ designs a new shrimp roll grading machine with the dispersive and directional device. This machine solves the problem of the original shrimp grading machine ,which covers a large area and is used to a restricted field. The improved shrimp grading machine cuts down area of about 1/3 than the original. Through contrast test, classifi-cation accuracy is slightly increased and damage rate is slightly reduced than the original machine. The structure is simple and improved easily on the original machine, it has a certain promoting significance.%TRIZ理论是一种解决创新问题的理论,它利用发明原理解决设计中技术冲突问题.采用TRIZ理论中的技术冲突解决方法设计一种带有分散定向装置的新型对虾分级机,该分级机解决了原有对虾分级机占地面积大,使用场地受限制的问题.改进后对虾分级机占地减小1/3左右.经对比试验,分级精度较原有机型略有提高,破损率有所降低.结构简单,易于原有机型的改进实施,具有一定的推广意义.
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