The invention discloses a
pneumatic circuit for numerically controlled lathe pneumatic door opening and closing. The
pneumatic circuit comprises an exhaust loop, and the exhaust loop is provided witha high-speed and high-load pneumatic
cushion loop. The high-speed and high-load pneumatic
cushion loop comprises a single-pole double-acting
pneumatic cylinder, a first reducing valve, a second reducing valve, a first speed regulation valve, a second speed regulation valve, a first
electromagnetic valve, a second
electromagnetic valve and a third
electromagnetic valve. An air source is connected with the third electromagnetic valve through a pipeline and the first reducing valve on the pipeline, the third electromagnetic valve is connected with the first electromagnetic valve and the second electromagnetic valve, the first speed regulation valve is connected with a
piston end cavity of the single-pole double-acting
pneumatic cylinder, and the first speed regulation valve is connected withthe first electromagnetic valve. The second speed regulation valve is connected with a connecting pole end cavity of the single-pole double-acting
pneumatic cylinder, the second speed regulation valveis connected with the second electromagnetic valve, the second reducing valve is connected with the first electromagnetic valve and the second electromagnetic valve, and the first reducing valve andthe second reducing valve are connected with the exhaust loop. The
pneumatic circuit is good in
cushioning effect, lightens sliding door
impact, avoids loosing of the pneumatic cylinder and sliding door guide rail screws and thus guarantees safety and the service life of the pneumatic cylinder.