Improve the mill output and quality of a few key issues, problems 1.1 mill production problems Generally speaking, direct way to improve the mill output has three kinds: 1. Plus home before the mill crushing machine; 2. Improved grinding system, improve grinding efficiency; 3. Plus home high efficiency separator. The above-mentioned three methods, any one kind of mill can greatly improve the yield. Of course, if factory conditions permitting, supporting the use of the above three methods, the effect is most ideal, this is the trend in recent years, domestic and grinding system design. Relationship between the three: the premise before the crushing mill, separator after grinding is to ensure that the mill is a fundamental transformation. Before crushing mill into the ground so that particle size is greatly reduced, thereby reducing the load on the grinding system; separator efficiency, the most direct benefit is the maximum fine be finished in time chosen to reduce cement products back to the extraction rate, reduced mill load; and the transformation of the mill, which is to improve the grinding system, Liaoning mill, is the most fundamental solution. 1.2 Quality of cement quality cement, just from the grinding process, the grinding broken and the front separator efficiency is not directly related. China's cement quality inspection indicators are generally two: the residual value of cement sieve and specific surface area. But in recent years the international cement quality test indicators on the cement particle size distribution, and, this indicator than the residual value of cement sieve and specific surface area to better reflect the real situation of the quality of cement. Second, the meaning of our mission is to implement the new standards must significantly improve the quality of cement products, further meaning is to accelerate the elimination of backward, to promote market competition, with the international cement standards for the cement industry after China's accession to WTO to prepare for integration into the international market . As a result, China's cement plant, especially small and medium cement how to improve the yield and quality of cement, it becomes a serious problem. Ball mill gear failures and shaft fracture Reasons and preventive measures of cement mill, metallurgy, mining, power plants and other industries important to the grinding equipment, auxiliary drive gear is an important part of it, its weight, size, cost in the whole of a large proportion of their reliability and safety directly affects the overall performance. Therefore research to strengthen the reliability and safety gear, it is particularly important. To establish the impact of a ball mill gear system fault tree diagram, mill plant, the gear failure, the lubrication system failure, failure of drive components and systems as an intermediate event no power input, analyzes the manufacture, installation, use and other factors on the running gear transmission . Through the fault tree quantitative, qualitative and critical analysis, the main factors to get a ball mill gear transmission failure. Ball mill gear transmission Fault and remove and take effective measures to provide reliable information, but also for troubleshooting ball gear transmission system laid the foundation. Pinion shaft and the bearing shaft but had turned loose, slag mill, the bearing inner race run, cause shaft wear, after the shaft up through the welding repair, but less than a year after Buxiu Failure. In order to ascertain the reasons for the pinion shaft fracture of the shaft fracture were microstructure and mechanical properties analysis. According to technical conditions, ball mill model, the shaft quenching, microstructure is tempered sorbite should, but if the results described heat treatment process did not meet technical requirements, and super brittle inclusions, there is the presence of loose tissue, which seriously reducing the fatigue strength of the shaft. _ North mine slag mill Zhongcheng (certified) _ Ball from Shenyang North Mine in Liaoning Zhongcheng machinery Limited. Shenyang North Mine Zhongcheng equipment Limited (sybkzc.com) (www.sybkzcjq.com) Liaoning Shenyang, machining leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. In North mine public into leadership with the staff warmly welcome all inquiries negotiations to create the North mine public into a better future.