Sand falling device and application thereof

The invention discloses a sand falling device. The sand falling device comprises a vibration unit, a guide mechanism, a metal sand box, a movable sand receiving unit and a hydraulic control unit, and the vibration unit is composed of a connecting support, an air pick drill rod fixing plate, a vibration rammer and multiple air pick drill rods; the guide mechanism comprises a cross beam frame and guide mechanism side edge seats vertically arranged on the two sides of the cross beam frame, multiple inner wheel sets are fixedly arranged in a gap between two parallel plate bodies of each guide mechanism side edge seat, multiple outer wheel sets are fixedly arranged on the outer side faces of the guide mechanism side edge seats, and the movable sand receiving unit is composed of a movable sand receiving vehicle and a movable sand receiving support fixed to the movable sand receiving vehicle; and the hydraulic control unit is composed of a hydraulic pump station, a lifting pressing oil cylinder, a movable oil cylind