缓冲托辊温度保护
Buffer idler temperature protection
带式输送机滚筒与皮带摩擦使其温度超限时，紧贴滚筒安装的检测装置发出超温信号，接收机收到信号后，经3s 延时，使执行部分动作，切断电动机供电，输送机自动停转，起到温度保护作用。
When the temperature of the belt conveyor exceeds the limit due to the friction between the pulley and the belt, the detection device installed close to the pulley will send out the over temperature signal. After receiving the signal, the receiver will delay for 3S to make the executive part act, cut off the power supply of the motor, and the conveyor will automatically stop running, thus playing the role of temperature protection.