Working principle of passenger car pneumatic single external swing door

The air path drives the door shaft to rotate by controlling the hydraulic valve, and the door shaft drives the rotary arm, which drives the door to open and close.

The quick door consists of a door frame system, a door curtain system, a driving motor, a control system and a safety system. The frame system is mainly composed of carbon steel plate or aluminum alloy, the door curtain system is mainly composed of PVC woven cloth or aluminum alloy profiles, and the driving motor system is mainly composed of brake pads, motors and reducers.

The control system is usually an integrated circuit board with a complete set of PLC/ inverter/encoder or IPM modules. Most of the control systems adopted by domestic door industry enterprises are mainly PLC/ inverter/encoder.

The safety system is mainly infrared electric eye switch, safety air pressure sensor (some control system enterprises with high mechanical precision and stability use safety contact belt) or light curtain system; The light curtain system should be a very high level of security protection.

Extended data:

The origin of public transportation can be traced back to at least 1826. At that time, a retired military officer opened a flour mill in the suburb of Nantes, northwest France, built a public bath with hot water discharged from a steam engine, and provided carriage service connecting the city center. ?

When he found that people along the way could use his coach, he opened a bus route between hotels for passengers and mail along the way to use for free.

Paris is the largest city for buses, followed by London. In less than ten years, this service has been popularized in major cities on the east coast of France, Britain and the United States, such as Paris, Lyon, London and new york.