Exhaust defoaming device for overflow pipe of flotation machine

The utility model discloses an exhaust and defoaming device for an overflow pipe of a flotation machine. The exhaust and defoaming device is arranged at the joint of a flotation machine foam groove and the overflow pipe; the defoaming device comprises a defoaming channel, a first-stage defoaming assembly, a second-stage defoaming assembly and an exhaust pipe, the lower end of the defoaming channelis communicated with the overflow pipe; the first-stage defoaming assembly comprises a first connecting pipe with connecting flanges at two ends and a steel wire group arranged in the first connecting pipe; the secondary defoaming device comprises a second connecting pipe, a defoaming net and a water spraying assembly; the exhaust pipe is of a bent pipe structure, and the lower end of the exhaustpipe and the upper end of the second connecting pipe are arranged at the upper end of the second connecting pipe through connecting flanges. And an outlet in the upper end of the exhaust pipe is formed above the flotation mac