The lining has excellent low temperature resistance, good chemical stability of polyethylene plate, resistance to most acid and alkali, low water absorption, low water vapor permeability. The top of the hopper is equipped with a mesh screen, which can screen out some relatively large gypsum blocks and impurities. Two vibration motors are installed on each side of the upper hopper to make the wet plaster slide naturally to the heavy belt scale at the bottom of the upper hopper. The upper hopper is equipped with 6 rubber shock absorbers, which is conducive to crossing the resonance zone and attenuating high-frequency vibration and noise.