Scraper reducer is a special reducer produced for the coal industry, with high reliability, large bearing capacity, strong safety and other characteristics, with the role of reducing speed and increasing torque. Double record coal machine can produce reduction gear and its accessories, such as reduction gear one axis assembly, reduction gear two axis assembly, reduction gear three axis assembly, reduction gear four axis assembly. Reducer has the characteristics of large bearing capacity, high transmission efficiency, generally used for input shaft and output shaft are arranged in a vertical direction of the transmission device.