High positioning accuracy using precision grinding gears, tooth surface smooth, precise tooth. The use of robust materials of the gear box Dian bay, and structural design as a whole, so that high stability. High torque high-quality tapered roller bearings, the output shaft can withstand greater axial and radial loads. Gear box and the bracket to adopt tough material, and structural design as a whole. Torque range from 15Nm to 2400Nm. High start-up performance and low noise using precision grinding gears, high precision and smooth the tooth surface, so smooth running and low noise gear. The use of selected German-made selection of synthetic lubricating oil, rather than the general use of the gear grease, due to the flow resistance, the gears can operate at full film protection, reduce noise. Low gear backlash in precision machining and strict quality control under such standard gear backlash is in a period of 4 to 6 arc minutes; paragraphs 6-8 arc minutes. Precision gear backlash over a period of 2 to 4 arc minutes; paragraphs 4 to 6 arc minutes. If necessary, the Commission accepted a lower backlash system. Easy installation and connection plate gear input shaft bore size of the mining flexible design, so that the deceleration function and various brands of servo motor Tat combined. Long life, maintenance-free precision grinding gears, the use of advanced nickel-chromium-molybdenum alloy steel, after hobbing and deep carburizing hardening treatment, and then the tooth surface grinding the gear rigidity, wear resistance and smooth the tooth surface. Using German-made high-quality synthetic lubricants, since liquidity is good, and is rich in extreme pressure compression agent, so that the parts between the teeth inside the fully lubricated and protected. Using German-made high-quality non-perishable seal makes good seal. The use of brand-name Western Europe tapered roller bearings, radial withstand the maximum axial load. More synergy excellent quality, so deceleration captain lifetime maintenance-free