Objective Aiming at the problems of easy damage of bulk stacking, difficulty in inventory grading management, and low degree of digitization in inventory management of pomelo processing and circulation enterprises, a digital management system for pomelo inventory grading was proposed.

Method Based on radio frequency identification(RFID) technology, a pomelo inventory grading management system was designed and developed with pomelo sorting equipment and wooden fruit frames. RFID readers were installed at the fruit outlet of the pomelo sorting machine and the outlet of the ring packaging line, and RFID chips were installed around the fruit frames. A digital platform was developed to realize the automatic grading warehousing, in-stock grading management, and sales grading warehousing of pomelo. At the same time, an APP application was developed based on a handheld PDA to facilitate real-time query and counting of inventory management by warehouse staff.

Result The experimental process was identified by five different distances, and the optimal distance for identifying fruit frames was 1.3-1.5 meters. At the optimal identification distance, the fruit frames were put into the warehouse for simulating production operations, and the number of fruit frames of various specifications entering the warehouse was counted. The system was functionally verified in actual production operations. 40 unstocked fruit frames were placed under the fruit outlets of each specification. After the test, the information on the pomelo fruit was stored in the warehouse, and the storage success rate was 100%. The fruit frames of various pomelo specifications were tested for outbound delivery at the outlet. According to the data display and the background system, the success rate of pomelo information outbound delivery reached 100%, meeting the actual work needs of the system. The application data of the system in the honey pomelo production season showed that the total weight of the 6 specifications of pomelo fruit purchased in 3 months was 1 145 615 kg, and the total weight of sales statistics was 1 063 699 kg, which was consistent with the company's record data. The system can record the number of storage frames of each specification of pomelo fruit in detail, and print the corresponding pomelo fruit traceability information when leaving the warehouse; after calculating the inbound and outbound data, the system calculated that the loss rate of pomelo fruit was only 7.15%, which can greatly reduce the loss of pomelo fruit inventory compared with the loss rate of 15~20% of the traditional stacking storage method.

Conclusion The pomelo fruit inventory grading management system can realize the functions such as grading warehousing, grading management in the warehouse, and grading outbound traceability of pomelo fruit, which effectively improves the work efficiency, digital management level, and overall benefits of pomelo fruit processing and distribution enterprises.