Air cleaning device

The utility model provides an air cleaning device, includes: casing, primary -grade filtering net, second grade filtering component, fan, alarm and filter screen drive assembly, second grade filtering component sets up in the casing, filter screen drive assembly includes spool, lower spool and driving motor, but the equal pivot ground of spool set up and is in under upward the spool reached in the casing, go up the spool with driving motor passes through the gear assembly meshing, primary -grade filtering net's one end is convoluteed roll up epaxially, primary -grade filtering net's the other end is convoluteed down on the spool, just primary -grade filtering net is located second grade filtering component keeps away from one side of fan, air cleaning device still includes ultrasonic detector, with the alarm is connected, is used for detecting coil on the spool down primary -grade filtering net's thickness triggered when being less than first thickness the alarm sends the warning. The utility model discloses