Optimize of Pull-up Shutter System for Sun-light Greenhouse Based on Full Protection

Pull-up shutter system is the first invented machinery for greenhouse shutter rolling，but it is used less and less due to a large security risk.For this reason，a full protection of pull-up shutter system was designed，which included a limit device and the diagnosis device.The system also had two modes for emergency and maintenance.This system could effectively avoid safety accidents and the stability and reliability of shutter system was guaranteed.Widely applied value was proved through the field test.