Laboratory glass sand core automatic control suction filtration device

The utility model discloses an automatic control suction filtration device for a laboratory glass sand core, which comprises a first water level sensor and a second sensor, the first water level sensor inputs a first access voltage to one input end of a first voltage comparator, and the other input end of the first voltage comparator accesses a first comparison voltage; the second water level sensor inputs second access voltage to one input end of the second voltage comparator, second comparison voltage is connected to the other input end of the second voltage comparator, and the output end of the first voltage comparator and the output end of the second voltage comparator are both connected with an on-off unit used for controlling the vacuum pump to work. The automatic protection communication structure is simple in structure, and manual timing manual operation is replaced by the automatic protection communication structure. Precision is guaranteed, errors are reduced, the situation that too much liquid is a