maintenance and upgrading of the existing line spare parts for air conveyor drive air neck guide side guide pneumatic components electric components high-efficiency filtration   fan switch plastic support for the sensor ref: A1103 optic sensor ref ：S4401 reflector for optic sensor ref：S4402 approximity sensor ref：S4403M12 emitter of ultrasonic sensor ref：S4404 connector of optic sensor ref：S4405M8 connector of ultrasonic sensor ref：S4406M12 receiver of ultrasonic sensor ref：S4407