Pneumatic motor of pneumatic packing machine

A pneumatic motor of a pneumatic packing machine, comprising:

• a main body having a chamber therein, a circumferential side of the main body having an opening, at least one air inlet hole and at least one exhaust vent which communicate with the chamber;
• a pneumatic unit disposed in the chamber of the main body, the pneumatic unit comprising a cylinder, the cylinder having a cylinder room therein, a circumferential side of the cylinder having a penetrating hole which communicates with the air inlet hole and the cylinder room and a through hole which communicates with the exhaust vent and the cylinder room, an impeller being pivotally connected in the cylinder room, the impeller having a rotating shaft, one end of the rotating shaft protruding out of the cylinder room and being provided with a driving toothed portion, the rotating shaft comprising a plurality of blades around a circumferential side thereof;
• a first planet gear unit disposed at the opening of the main body, the first planet gear unit comprising a first rotating member, one end of the first rotating member having a first connection trough for insertion of the driving toothed portion of the pneumatic unit, another end of the first rotating member being provided with a driven toothed portion, a circumferential side of the first rotating member having at least one first through hole which communicates with the first connection trough, the at least one first through hole being pivotally provided with a first gear, the first gear meshing with the driving toothed portion, a first fixing ring being fitted on the first rotating member, the first fixing ring being fixed to the main body, the first fixing ring having a first inner toothed portion on an inner wall thereof, the first inner toothed portion meshing with the first gear;
• a second planet gear unit connected to the first planet gear unit, the second planet gear unit comprising a second rotating member, one end of the second rotating member having a second connection trough for insertion of the driven toothed portion of the first rotating member, another end of the second rotating member having a toothed trough, a circumferential side of the second rotating member having at least one second through hole which communicates with the second connection trough, the at least one second through hole being pivotally provided with a second gear, the second gear meshing with the driven toothed portion, a second fixing ring being fitted on the second rotating member, the second fixing ring being fixed to the first fixing ring, the second fixing ring having a second inner toothed portion on an inner wall thereof, the second inner toothed portion meshing with the second gear;
• and
• a transmission member connected to the second planet gear unit, one end of the transmission member having a passive toothed portion, the passive toothed portion being connected to the toothed trough of the second rotating member.