When using a mesh belt dryer to dry onions, the following are some things to pay attention to:

1. Temperature control: Make sure to choose the appropriate drying temperature. Onions are usually dried at temperatures between 50°C and 60°C. Temperatures that are too high may cause the onions to overdry or burn, while temperatures that are too low may result in incomplete drying.

2. Ventilation and air flow: Good ventilation and air flow are necessary to ensure that the onions are evenly heated during the drying process and to facilitate the evaporation of water. Make sure your dryer's ventilation system is functioning properly to maintain proper humidity and temperature.

3. Evenly distribute the onions: Evenly distribute the onions on the mesh belt of the dryer to ensure that they are blown by even hot air. Avoid excessive stacking of onions to avoid affecting the circulation of hot air.

4. Turn the onions: During the drying process, turn the onions regularly to ensure they cook evenly. This helps avoid excessive dryness on one side of the onion and excessive moisture on the other side.

5. Check the drying process: Closely observe the drying process to ensure that the onions reach the required dryness within the appropriate time. Different sizes and varieties of onions may require different drying times.

6. Prevent mold and bacteria: During the drying process, make sure the onions are completely dry to prevent the growth of mold and bacteria. If onions remain moist or contain too much moisture, they may be susceptible to rot or contamination by microorganisms.

7. Storage and packaging: After drying is completed, store onions in a dry and ventilated place. Choose appropriate packaging materials to maintain the quality and shelf life of your onions.

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