This invention is an automatic device applied in the multilayer cultivation shelves in plant factories to maintain the consistent light intensity on the plant canopy. This device could detect the plant height and move up the light source upward automatically to maintain the consistent distance between plants and the light source. The device provides a consistent light environment during the cultivation. It solves the dilemma caused by the traditional design of fixed position of light: light insufficiency caused by the large distance between the light and plant on the early stage, and the possibility of heat injury on the leaves when the plants grow up to reach the surface of light. This devise uses less light tubes to maintain a suitable light intensity for plants and achieves the energy-saving advantage.本發明揭露一種可隨作物株高自動調整人工光源高度的控制機構。栽培層架包括至少一植床、一燈架及一控制機構,該植床裝載有至少一作物,該燈架設置有至少一燈具(例如LED),該燈架及控制機構係對應設置於該植床上,其特徵在於該控制機構包括:一作物高度感知單元,其為兩組對角線固定安裝的穿透式光電開關,係可感知該作物之高度;一燈架高度調整致動單元,其包括一交流馬達、一滑輪及一減速機,係可移動地連接於該燈架上且可調整該燈架與該作物間之距離。其中該作物高度感知單元感知該作物之高度後,該燈架高度調整致動單元可據以調整該燈架與該作物間之距離,使該燈具與該作物維持一預定距離,使該作物可接受一預定光量。100...栽培層架1...植床11...作物2...燈架21...燈具3...控制機構31...作物高度感知單元311、312...穿透式光電開關32...燈架高度調整致動單元321...交流馬達322...滑輪323...減速機33...繩索
