To build high strength Raymond mill, it is necessary to improve the milling capacity, which is of great importance undoubtedly. It is also suitable for other kinds of milling equipment (ball mill). The main structure parameters of the traditional Raymond mill such as the diameter and thickness of the grinding roller, the diameter of the grinding circle and the rotational speed of the spindle are immutable, which has become the traditional technological restriction. From the milling principle, driven by the spindle, the Raymond mill rotates through the grinding roller device. Under the role of the centrifugal force, grinding roller presses to the grinding ring and the rollers do the spinning motion under the action of friction. This kind of grinding motion conducted by the rollers on the grinding ring forms the main mechanism of the milling. From this point, to build the high strength Raymond mill with powerful milling capacity, it should meet the following requirements: 

(1) to improve the grinding pressure; 

(2) to have a better control of the grinding powder area one revolution (the height of the grinding roller × the inside diameter of the grinding ring); 

(3) to increase the probability of contact between the roller and grinding ring; 

(4) to improve the rotational speed of the spindle. 

Currently, some manufacturers of Raymond mill make efforts in improving the grinding pressure by taking the measures of the pressure springs and hydraulic cylinder, but there are pros and cons of this way. The overhang roll of the traditional Raymond mill can swing freely and it can escape from the larger and hard materials which can not be crushed once in the grinding process, which not only protects the roller device from the damage, but also is beneficial to the crushing through the bounce effect. Therefore, the pros and cons should be measured from the final fineness and the yield. The high strength Raymond mill takes the following measures: 

(1) to increase the diameter of the grinding roller and grinding ring; 

(2) to conduct the finish machining of the roller surface so that the roller and the grinding ring are in the accurate grinding state at the beginning to ensure the good contact and uniform wear; 

(3) to increase the rotational speed of the spindle 7% to 8% to improve the grinding efficiency under the premise that the host power is unchanged. The processing capacity of ultrafine powder is particularly improved.