Study On The Comprehensive Performance Index Of Transplanting Grippers

Seeding transplanter is the frontier topic of facilities agriculture automationresearch, comprehensive evaluation method is a new emerging research field of multisubjects, mutual penetration, multi point support. With the rapid development offacility in China, the demand for automated greenhouse seeding transplanter is alsoincreasingly prominent. Comprehensive evaluation is a quantitative description of theresearch object function, and has the advantages of integral, comprehensive,standardized, in the past thirty years has been rapid development. Comprehensiveevaluation results also indicate the direction of structure optimization. With thecontinuous improvement of transplanter requirements in high precision and highefficiency, the comprehensive evaluation method is introduced into transplanterdesign, shorten the design cycle, improve overall performance, will become a newdirection in the field of agricultural facilities. Therefore, this research has importanttheoretical significance and practical value.In this dissertation, comprehensive evaluation and transplanter design werecombined, and taking the seeding clamping devices which is key mechanism oftransplanter as the object of analysis, a comprehensive study of comprehensiveperformance evaluation such as comprehensive performance index system established,clamping device performance study, matrix mechanics experiment and simulation,transplanting and mechanism optimization has been made.Firstly, the index system of comprehensive performance for the seeding clampingdevices which is key mechanism of transplanter was built. Using the theory of TRIZon transplanter module partition, the key institution was extracted. And functionanalysis was carried out on the clamping devices; the technical contradictions havebeen proposed. Using the fuzzy analytic hierarchy process, the success rate has beendivided, evaluation indexes were screened, and a comprehensive performanceevaluation system of the clamping device was built.Secondly, the comprehensive performance for the clamping device is studied. Setup the experimental platform for this topic, the influence for the success rate ofclamping, such as needle impact force, friction, jam and steel corrosion has beenanalyzed. At the same time, it laid the foundation for the kinematics simulation.Thirdly, the friction characteristic between steel and matrix was carried out, andvirtual prototype simulation was made. To analysis the influencing factors of steelfriction, the basic indicators of matrix was tested and needle insertion test was made.To prove the validity of the parameter selection, the simulation of steel needle inserted has been made by using ABAQUS as the platform.Finally, the seeding transplanting experiment was carried out and theoptimization design of the organization has been made. Through the experiment oftransplanting seedlings, the influence for seedlings between hold force, extraction andimpact force has been analyzed. Through the weight distribution, structureoptimization design is performed.