Expansion mechanical air suction control device

The utility model discloses an expansion machinery air suction control device which comprises an installation cylinder body, the lower end of the installation cylinder body is in bolted connection with a flange, a rotating assembly is rotationally arranged in the middle of the interior of the installation cylinder body, cavities are formed in the two sides of the interior of the installation cylinder body, and blocking assemblies are slidably connected in the cavities. And sealing blocks are fixedly connected to the middle positions of the upper ends of the interiors of the cavities correspondingly, and air outlet holes are formed in the two sides of the upper end of the mounting cylinder correspondingly. According to the air suction device, the blocking assemblies located on the two sides are driven by the rotating assembly to do reciprocating motion in the cavity, so that the open holes and the air outlet holes can be periodically overlapped, the opening and closing states of the air suction action can be c