20 layers of billet rack, each 1.5KW motor drive, frequency conversion control, outer frame sealing foam board insulation; lifting rack 1 using 7.5KW motor frequency conversion speed lifting, solid Phi 110 nylon wheel line rack, 1.1KW motor frequency conversion speed drive: lifting rack 2 adopts 7.5KW motor frequency conversion speed control lifting, belt platform transmission transmission, 1.5KW motor frequency conversion speed regulation drive.