Leak-proof device for suction drying tower of air dryer and control method

The invention provides an air dryer suction drying tower leakproof device and a control method, the air dryer suction drying tower leakproof device comprises a PLC control system, a local controller and two suction drying towers which are connected through a connecting pipe, the bottom of each suction drying tower is provided with an air inlet valve and a release valve, and the top of each suction drying tower is provided with a one-way valve; the end, away from the drying tower, of the release valve is connected with an exhaust main pipe, the exhaust main pipe is provided with a pressure switch electrically connected with the release valve, and the end, away from the release valve, of the exhaust main pipe is provided with a silencer. The pressure switch is additionally arranged on the exhaust main pipe, when the pressure of the exhaust main pipe reaches an action threshold value, the suction drying tower release valve is closed in an interlocking mode, and the situation that a large amount of air leaks from