Gear rack type oscillating cylinder

The utility model relates to a gear and rack type oscillating cylinder. The device comprises a cylinder body, a gear, a first threaded piston rod and a second threaded piston rod, the first air inletis connected with the first air inlet channel; the first air inlet channel extends into the cylinder chamber below the second upper end cover; the second air inlet is connected with the second air inlet channel; the second air inlet channel extends into the cylinder chamber above the second lower end cover; the first vent hole and the first air inlet channel are positioned in the same cylinder chamber; the second vent hole and the second air inlet channel are positioned in the same cylinder chamber; the first vent hole is communicated with the first exhaust hole through a first airflow channel; the second vent hole and the second exhaust hole are communicated through a second air flow channel, the first exhaust hole and the second exhaust hole are located above the first lower end cover and below the first upper e