Automatic adjustable powder scattering tool with PWM (pulse width modulation) technology

The utility model relates to a powder scattering tool for silkworm breeding, in particular to an automatic adjustable powder scattering tool with a PWM (pulse width modulation) technology. The automatic adjustable powder scattering tool comprises a vibration sieve, a motor, an eccentric block arranged on a motor shaft, a connection piece, a graticule, an O-shaped ring and a potentiometer adjustment knob. According to the automatic adjustable powder scattering tool with the PWM technology, the potentiometer adjustment knob is rotated to control a potentiometer, the potentiometer is used for changing a duty ratio to change a rotating speed of the motor, and the powder scattering amount can be adjusted. The graticule is connected with the upper end of the vibration sieve; the upper end outside a sieve frame of the vibration sieve is sleeved with the O-shaped ring, and the graticule and the O-shaped ring can be used for effectively reducing vibration noise during powder scattering. The automatic adjustable powder scattering tool has the advantages of simple structure, low cost, low noise, long service life, low energy consumption, high practicability and the like, is mainly used for silkworm breeding and can be also applied to medicinal powder scattering in a medical health department.