SUCTION RECOVERY SYSTEM

PROBLEM TO BE SOLVED: To provide a suction recovery system capable of returning recovered material stagnating in a separator to a hopper without additionally providing a circulation pipe nor a suction pipe and capable of easily performing the work for returning the recovered material stagnating in the separator to the hopper. SOLUTION: When usually recovering, a first opening/closing valve 61 and a third opening/closing valve 83 are opened and while a second opening/closing valve 82 is closed, and when returning the collected dust stagnating in a dust collection chamber 75 to the hopper 2, the first opening/closing valve 61 and the second opening/closing valve 82 are closed and while the third opening/closing valve 83 is opened to operate a blower 10, and inside the hopper 2 is formed with negative pressure. Thereafter, the second opening/closing valve 82 is opened to take open air into the dust collection chamber 75, and the collected dust stagnating in the dust collection chamber 75 is returned to the hopper 2. COPYRIGHT: (C)2006,JPO&NCIPI