As the global fruit tree planting area continues to expand, the fruit production speed increases, the post-harvest processing of fruit has become an important work, in order to lay a good foundation for the future sales and processing of fruit, after harvesting the first grading of fruit is very necessary. After grading the fruits, the sales grade will be improved and the effect of adding value to the products will be achieved.

From the technical point of view, the grade determination of fruits during manual grading is based on personal experience, which is slow and labor-intensive, and the result of instant judgment, which is bound to vary from person to person, and also affected by human emotion and fatigue level.

With the rapid development of computer and automatic control technology, agricultural technology will move into a highly automated, assembly line era. Combined with the actual situation and needs, we developed the fruit weight grading machine, each grade to the customer's needs through the PLC freely set, can be applied to orange, pear, mango, avocado, passion fruit, orange, apple, mangosteen, peach, tomato, lemon and other weight sorting, general round-headed fruits and vegetables can be applied, the machine full length of 20 meters, width 1.2 meters, height 1.5 meters, a single line per hour can be sorted 26,000 per hour, double lines can be sorted 55,000 per hour, weighing range 15-500g, precision in about 2 grams, power of 5.2kw, its classification equipment is simple, wide application, easier to achieve. Its wide range of use, wide adaptability, high efficiency, is the ideal equipment to improve the product grade, value-added income generation.