Old-fashioned crusher is generally using high manganese steel, this kind of hammer crusher of limestone broken cycle is short, use resistance, abrasion resistance loss was not enough. With the development of technology, high manganese steel has appeared hammer head and double alloy hammer. Double alloy hammer, usually three forms: one is, in the work of hammer head on a layer of hard alloy welding, improve the hammer and anti-wear properties; Secondly, in the controlled, improve the working parts of the hammer head chromium casting alloy (mainly) content: the third was, in the work place, hammer head set hard alloy or alloy piece stick. Grinding process is to examine the purpose of grinding and classification process of the operating process conditions, technical specifications, operational efficiency and determination to conduct a comprehensive test. Through the process of the product number, concentration and particle size determination, calculation and comprehensive analysis, which found problems in production, in order to make technical improvements to the mineral processing technology and economic indicators to a new level. Study on methods of grinding ball mill and crushing process, sorting process similar to the test. Let s take a look at the preparations before the visit: 1 Because of the heavy workload test, the required human and more in the test must be clear before the purpose and content of the test, make full preparations for human and material resources. 2.Because the stope mining and crushing of the final product size to investigate to ensure that test during the mill to the mine representative.

3 For grinding and classification equipment operation and integrity of the investigation, the maintenance arrangements for the timely maintenance to ensure that the sampling device during normal operation. 4 Arrange the sampling points of sampling personnel, sampling tools and containers containing samples and posted a good label. Some experts predict that the pace of development of mining machinery will slow down, so now consider the post-industrial mining machinery and domestic and international market demand is not early. Mining machinery manufacturing industry in the current process of design is relatively weak business case, in addition to good conditions in their own areas of expertise into the role of organizational strength as soon as possible, should be taken with foreign companies and professional design institutes to establish different forms of joint, including formation of groups, the Commonwealth, technology, personnel and other measures to introduce, at least to strive to take on the project in a joint design approach, the first intervention and then increaseso a win-win, and they are mostly ineffective recklessly to lay.