Unconventional Troubleshooting Methods for Sand Dryers

When this fault occurs, adjust the tension screw rods for resolution. In actual production, the sand dryer operator shall shut down the equipment temporarily. According to the amount of sand accumulated at the tail roller of the conveying equipment, scrape off part of the sand on one side of the equipment, or sprinkle a small amount of sand on the other side—this will resolve the material leakage and belt deviation fault of the matched conveying equipment.

Once the inspection hatch of a sand dryer cracks or deforms, it cannot be closed tightly. The optimal solution is to make a new custom inspection hatch with 4mm-thick ordinary steel plates. Weld rivets on the contact surface of the hatch with flame, and pour water-based castable material to prevent the steel plate from being directly baked by flame.

To solve this fault, install a thermocouple on the flue gas pipeline at the tail of the sand dryer and set upper and lower temperature limits. An audible and visual alarm will be triggered when the temperature exceeds the range, reminding on-site staff to handle the problem in a timely manner. When material cut-off occurs in the sand dryer, the flue gas temperature at the tail rises sharply, and the thermocouple will alarm to prompt operators for immediate handling and minimize the cut-off duration. When the feed entering the dryer has high moisture content, the tail flue gas temperature drops, and the thermocouple alarms to urge on-site operators to raise the hot blast stove temperature or reduce the feeding rate of the sand dryer, ensuring the quality of dried sand.

Cut two holes at the cylinder position where the lifting blades are to be welded, and fix the blades to the cylinder with bolts instead. After running the equipment for 1 to 2 days, retighten any loose bolts appropriately, then perform a full weld at the contact points between the nuts and the cylinder to prevent material leakage.