Abstract: The side range hood with automatic opening and closing guide plate is prone to open and close failure in low temperature environment. By means of test design, force analysis and theoretical calculation, the fault is repeated and the fault mechanism is analyzed. The unreasonable gap design between the screw rod and the screw sleeve transmission pair of the push rod motor is found, the solution of increasing the design clearance of the transmission pair and modifying the software logic to increase the load capacity of the push rod is put forward, through the actual verification, the improvement of the solution is effective.

Key words: Range hood, Low temperature, Open and close failure, Push rod