Upper limit micro switch and upper limit micro switch. The stroke double safety device refers to one of the three patents of Sundele intelligent quick-drying clothes dryer, namely the upper limit micro switch and the upper limit micro switch. As long as the upper limit micro switch and the upper limit micro switch When any one of the switches works, the power to the motor can be cut off, thus forming a double protection and solving the problem of the upper limit micro switch failing in case of failure.