Vertical mill and Raymond mill processing contrast
Vertical roller mill (referred to as vertical mill) and raymond mill grinding mechanism similar to all belong to the rolling crush, which is destined to produce less than the amount of fine powder per unit time. As the roller pressure is used hydraulic method, the roller pressure roller material greater, so the grinding efficiency is much better than the Raymond mill. Initially, vertical mill are two roller structure, mainly used for the production of 400 meals the following meal.
In order to improve the content of fine powder per unit time, three-roll vertical mill was developed later, and the content of fine powder has been greatly improved, but generally, the products below 1000 heads are still mainly produced. Later, some people on the upper classifier has been transformed, can be directly produced 1250 mesh powder. The use of the raymond mill out of the 600 head -1000 head products, the other with ultra-fine grading machine for second grading, can produce more than 1250 heads of products. At the same time, the equipment system investment cost is too high.
Vertical mill R & D and production of high technical requirements, China's relevant research institutes in the 1980s proposed to vigorously promote the legislation in the cement industry legislation, and when there are some manufacturers have introduced their own vertical mill products. However, at the time of the limited research and development level, vertical mill products at this time had unavoidable technical defects. Therefore, many cement manufacturers finally switched to ball mill again. In recent years, with the R & D and development of milling machinery increased dramatically, vertical mill technology of foreign mill manufacturers has matured, vertical mill product technology advantages have become increasingly prominent. In this situation, the domestic manufacturers of milling machines to learn from the successful experience of foreign countries for major technological reforms, but also have re-launched with their own patented technology vertical mill products, and gradually accepted by the domestic cement, electric power, chemical industry , Become the preferred equipment grinding industry.