rice grader machine are used for sorting and grading of seeds. The incoming material is sorted according to its width (round perforation) and respectively its thickness (slotted perforation). All kernels thinner than the screen holes fall through the screen, and all thicker kernels remaining in the screening cylinder are transported to the end-outlet. By means of the permanent circulation of the product and the resulting centrifugal force, each kernel is forced to be in contact with the screen perforation plenty of times, enabling sorting operations to be carried out with high accuracy. Capacity up to 30t/h. It is necessary to deflect the product falling through the upper screening cylinder so that it does not hit the lower cylinder. Therefore, deflector boxes are used. The oversize product is discharged at the end of each cylinder. The even distribution of product to the single cylinders is achieved by a weight regulated flap on the inlet, to the separate inlet channels. The product falling through the upper screening cylinder is fed to the inlet of the next cylinder by means of a vibrating trough. The oversize product is discharged at the end of each cylinder.
Grading potatoes by size is an important operation for preparing tubers for seed and for commercial purposes. Farmers in Iran and in developing countries grade potatoes by hand, which is very slow and costly. This work concerns the development of a potato-grading machine for small-scale farmers. The design is characterized by a spiral structure covered with a capron net to form a cribriform rotating drum as the grading surface. Potato tubers are fed into the drum, moved forward by the spiral structure, and dropped through holes of the net according to their dimensions. The design parameters included net stiffness (T), rotating drum speed (n) and feeding rate (q). The grading accuracy of the machine was evaluated to determine optimum condition of machine performance.
It is clear that mechanized grading of pistachio nut reveals many advantages including elimination of wages behalf of manual grading, more uniformity and more hygienic product compared to manual methods. Therefore, design of full-automatic sorting machines can attract more customers and supports to Iran's position in export of this worthwhile produce. Among many available methods for quality evaluation of the crops, machine vision (MV) systems have proven to be the most powerful. A MV system consists of two main parts: hardware and software parts. These systems like the human eye are strongly influenced by lighting system. This part has a significant effect on the quality and resolution of the captured images and also considerably affects overall performance and efficiency of the MV system.
Rice bran is a by-product of the conversion of brown rice to white rice. Bran is the hard outer layers of rice grain and is particularly rich in dietary fibre and essentialfatty acids and contains significant quantities of starch, protein, vitamins, dietary minerals and phytic acid, which is an anti-nutrient that prevents nutrient absorption. The bran has high oil content which makes it subject to rancidification which is also one of the reasons that it is often separated from the grain before rice whitener machine. The bran itself can be heat-treated to increase its longevity.
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