Automatic exhaust pneumatic cylinder

The utility model provides an automatic exhaust pneumatic cylinder, including piston, piston rod, cylinder, sealing device, the inside deep hole that is equipped with of its characterized in that piston rod, the deep hole is the through -hole, and the piston rod is equipped with the trompil with piston complex one end, deep hole one end and trompil intercommunication, the oil return way is connected to the deep hole other end. At piston rod activity in -process, the gas in the pneumatic cylinder mainly appears with the bubble, trompil department of floating on the bubble, thus it directly gets into in the oil return way to flow into the deep hole in the same direction as the trompil to reach automatic clear up fast in the pneumatic cylinder gaseous, the purpose of automatically cleaned hydraulic pressure oil circuit. The utility model discloses think about ingeniously, rational in infrastructure, application prospect is wide. 本实用新型提供种自动排气液压缸，包括活塞、活塞杆、缸筒、密封装置,其特征在于活塞杆内部设有深孔，深孔为通孔，活塞杆与活塞配合的端设有开孔；深孔端与开孔连通，深孔另端连接