The development of domestic and international road milling machine Overview: Foreign road milling machine originated in the 1950s, after 60 years of development, its product technology is relatively mature, the working efficiency is generally 150-2000m2 / h, maximum milling depth up to 350mm. Its hydraulic integration technology has become mature, milling depth can be automatically controlled by the automatic leveling system, as well as improve the working environment, to extend the life of the road milling bits, the design of sprinkler systems and closed milling drum cover. 

In order to reduce labor intensity in recent years, the development of products come with recovery, so that the milling material objects transported directly from the milling drum to carry trucks. Many foreign manufacturers, mainly Wirtgen, Bitelli, Caterpillar, Dynapac and so on. 

Wirtgen is in a dominant position in the international arena, especially small milling machine is second to none, the main production W and DC series milling machines, the maximum milling depth of 350mm, China's major imports of the company products. 

Bitelli already has 40 years of manufacturing history of milling machines, the SF series of cold milling machine has 11 kinds of models, milling depth of 340mm. 

Caterpillar mainly produces two series of PR and PM, milling depth of 305mm, its milling machine milling surface with a milling depth and automatic leveling automatic control functions, milling depth error of ± 3mm. 

Dynapac PL series of major production milling machine, milling depth 80-150mm. 

Development of domestic road milling machine starting in the 1980s, is based on the tractor to start by installing a milling device chassis refitted until well into the 1990s, began to be developed self-propelled milling machine. Overall, the lack of domestic milling machine series, features are less developed, low-tech, poor reliability. Production milling machine milling width 2 meters only Xuzhou Construction Machinery factory, and several of the few manufacturers. 

State Economic and Trade Commission has made it clear that "fifteen", milling speed 0-3m / min, milling depth 0-300mm milling machine to quickly improve road maintenance machinery of our international competitiveness. On the current level of technology products, the domestic manufacturers to Xuzhou Construction Machinery Factory, Zhenjiang Huatong Machinery Group Corporation, Shandong Engineering Machinery Company 3, Texas-based. Xuzhou Construction Machinery factory in Germany to introduce Wirtgen 2000DC milling machine technology in 1999, has been formed by the digestion and absorption were milling width of one meter and two meters of the series products.