Casting sand recycling system and method for regenerating cast sand

摘要

In the reproduction system and the regeneration method of the casting sand, the regeneration processing is carried out more appropriately in accordance with the properties of the cast sand to improve the regeneration accuracy and the regeneration yield.Capacitance measuring devices 70 and 71 for measuring the electrostatic capacity of the casting sand 1 (recovered sand 1A or recycled sand 1b) are disposed on the upstream and downstream sides of the batch type polishing apparatus 7, and feedback control is carried out based on the measurement results of the electrostatic capacitance by the electrostatic capacity measuring devices 70 and 71.The sorting device 10 selects the collected sand 1A polished by the polishing device 7 into sand grains (recycled sand) and fine grain components (binder), and has a capacity of N times the polishing device 7.The control device 80 performs feedback control on the basis of the electrostatic capacity Ru of the recovered sand 1A measured for each polishing process on the upstream side of the polishing apparatus 7 and the average value of the electrostatic capacity RD of N recycled sand 1b measured for each polishing treatment at the downstream side of the sorting device 10.