Study On Design Principle And Tests For Main Parts Of 4HQL-2 Peanut Combine

The development of Chinese peanut harvest machinery is in the blank condition basically; together with execution of the "Eleventh Five-year Plan" Major Project of Chinese National Key Technology R& D Program, a kind of new peanut combine is invented and developed in the dissertation in view of the panting mode and growth characteristics of peanut in China. As the most important part, design, theoretical analyses and field tests are made toward key installation of the peanut combine, and the work performance and adaptability are both enhanced. According to appraisement made by Ministry of Agriculture general examination station, each target of the complete machine reaches the Ministry of Agriculture peanut harvest profession standard requirements. Main work finished is as follows:1. Pulling, shearing and bumping persistent tests are made to peanut plant during peanut mature period, and regression analyses are carried on using SPSS and other software. Through regression analyses of straw root node and root nut node pulling tests, root nut node pulling force marginal value is determined to be the digging harvest and nut-picking mechanics design point; peanut best harvesting time in mechanics angle is obtained according to regression analysis of pulling-parting critical point; peanut biggest bumping power-receiving during the best harvesting time is achieved, which provides mechanics foundation for nut-picking installation design.2. Clipper-built digging principle is proposed, which is:landscape orientation surface of digging shovel takes the form of function partition and spline curve fitting design, while the lengthways surface takes plough-share and the circular arc camber unitized designs. So the aim of soil smoothly slippage in landscape orientation, resistance reduction, cost fallen, and combination of breaking ground and breaking soil is achieved. Clipper-built digging shovel is developed, and peanut plant moving path is obtained through soil and plant movement analyses; digging shovel dynamics analyses is carried on, and digging shovel space mechanics characteristics is got together with Ansys finite element analyses.3. Flexible clamping pulling principle is proposed, and a kind of ordinary three belts clamping installation is developed. Flexible clamping pulling instantaneousimpact dynamics is obtained through clamping pulling tests; in view of the belt type, band width and clamping speed, orthogonal variance analyses are carried on, and the optimum allocation position of C type double belting and D type single belt is obtained; the comparative trial analyses are made with traditional clamping chain rigidity clamping harvest way, which show that compared with traditional clamping chain rigidity clamping harvest way, flexible clamping harvest has the advantages of low nut-loss rate, simple equipment and low run cost, etc.4. Towing type nut-picking principle is proposed. On the base of experimental analyses of traditional nut-picking equipment, according to the mechanics characteristics of fresh wet peanut, characteristics and movement parameter of towing type installation is analyzed; dynamics analyses of nut-picking installation is carried on, and cylinder torque equation is established. Towing nut-picking equipment and cleaning installation is developed; according to twice regression tests, regression equations of nut-picking experimental factor and experimental target, and parting experimental factor and experimental target are established. Meanwhile, combined with Ministry of Agriculture peanut harvest profession standard, the best operational parameter is determined.5. In view of mechanized harvest in the peanut growth soil environment with lots of detritus, a kind of up-and-down swing type soil-eliminating installation is developed. And according to various parameters theoretical analyses design and field comparative trial, the installation is much more suitable for soil-eliminating work of peanut combine harvest. The chain-and-tooth type plant-poking feeding installation is developed through the analyses of digging harvest installation and peanut plant movement. Through the theoretical analyses, clamping harvest digging area is determined, and through the orthogonal regression tests, the best operational parameter of the digging and feeding installation is determined.6. Load and torque tests and analyses are carried to the key component, and digging installation working space system of forces and power consumption are analyzed mainly. Torque determination is made to the essential transmission part-the second drive shaft, and its work stability and power distribution are analyzed. Thus, power distribution of the complete machine's various work parts is determined, providing basis for complete machine optimization.Field performance tests are carried on to the complete machine, and the work target adaptability under different soil hardness degree and different humidity environment is determined. And each experimental target completely reaches the requirements of Chinese peanut combine harvest. In November,2008 this machine received appraisal of the experts organized by Ministry of Agriculture, and the Expert board got the conclusion that:the clamping, soil-eliminating and nut-picking and other installations are domestic and foreign pioneers; the overall technology achieves international advanced level among the similar machines and tools.