The invention discloses a
coal pulverizer with a function of reminding over-low rotating speed of a motor. The
coal pulverizer comprises a base, a supporting column is fixedly arranged at the upper end of the base, and a power shell is fixedly arranged at the upper end of the supporting column. According to the
coal pulverizer, when the rotating speed of the motor is decreased in the device and the rotating speed of a power friction wheel is decreased, a sliding block is made to move rightwards, and the sliding block moving rightwards drives a friction wheel through a fifth transmission shaftto be in friction connection with the position, with the small
radius, of the power friction wheel, so that a smashing wheel is kept at the normal rotating speed all the time, and a sliding support ismade to move leftwards; and when the rotating speed is too low, the sliding support moving leftwards drives a fifth
bevel gear and a sixth
bevel gear to be in engaged connection through an eighth transmission shaft, so that a second transmission shaft has power to enable sounding
metal to sound to remind workers that the
motor speed is too low, the problem of low efficiency caused by reduction ofthe
motor speed can be relieved within a certain range, the workers can be reminded when the
motor speed is too low, and the working reliability of the pulverizer is guaranteed.