| Fruit grading is an important tache for it entering circulating field, and it has direct relationship with the benefit of the fruit producing. Today with highly developed market economy, any of the trade such as selling in the different place, a large amount of farm production business and international trade of farm produce can't disengage standardization, and fruit grading is the most basal step for realizing standardization of fruit commodities. Fruit resource of our country is abundant and with various varieties, but as most of the fruit come from country collectivities and individual growers, the fruit of different sources have different quality, big and small apples are immingled, and with the influence of the damnification of different extent during picking and transporting, it takes series of problems for the grading and machining of fruit. Especially the fruit for export, as without strict grading, the exporting quality of the fruit and its production is on the low side, and about a hundred million dollars is lost.Fruit of our country is graded most by manpower at present. The disadvantage is that labor intensity is large, productivity is low, and grading precision is not stable. It can realize automatization of fruit grading, improve grading efficiency and precision effectively, by using incorporate machine and electricity equipment controlled by microcomputer to replace busywork of manpower. So it becomes an important task of mechanization of farming of our country to research and empolder automatic fruit disposal equipment after the fruit is picked, sell it or process it with different classes.The research of the paper is mainly on the base of machine design elements, apply of singlechip and interface technology, language C applications programmer of singlechip, analog electron elements, C programmer and so on, machine system and weighing module of fruit grader on machine vision and weight is mainly researched and designed. Specific research contents are as follows:1. The machine system of fruit grader on machine vision and weight is designed and manufactured, and a running test has been made by the system. The test shows that, the whole machine runs well, and satisfies the prospective design demand. It can realize even overturning in approximate equal angle velocity and discharging reposefully without impact for the apples that the big one is twice as big as the small one (the diameter is between 50 mm and 100 mm), and the apples that are discharged without obvious damnification.2. The weighing module of the fruit grader on machine vision and weight is designed. The hardware mainly includes lowpass filtrate circuit, Analog to Digital convert circuit, keyboard/display circuit and reset and storage circuit. It inspects the apples'weight by the weighing sensor fixed under the rollers, converts the apples'weight signal into analog voltage signal, and the signal is filtrated by the lowpass circuit, converted by Analog to Digital converter, delivered into weighing module controller for data processing, and the fruit's weight is educed.3. Synchronous control system of the fruit grader is designed. Through the test, it shows that, at the prospective transporting velocity, the system could accomplish real time inspection and continuous tracking of fruit's dynamic position in the feeding line, and accurate match of the weight, grades and position information.4. Software design of the whole system is accomplished using C, and the debug is passed. The main programme mostly include the subprogram of analog to digital converting, interrupt serving, data memorizing, data processing, keyboard /display and CAN-bus.5. Test is made using the whole system, and it shows that, at the control of the synchronous control system, the modules of the grader can work in phase, inspect the exterior quality and weight of the apples; upon many times of tests and analyzing of the testing result, the corresponding relationship between the weight of fruit and its A/D convert result is educed.
|
PDF Full Text Request