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Mining Machinery is a pillar industry in the economic construction and social development plays an irreplaceable role. In mining, energy, transportation and industrial raw materials and other construction industry, mining machinery and mining equipment as construction materials processing equipment, providing a steady stream for a large number of basic industrial sectors and energy, protect the national construction and economic development healthy. Therefore, the level of mining machinery industry is a important indicator of advanced industrial countries. Grinding Mill ;machinery industry is a national foundation and pillar industry in national economy plays an extremely important position. Machinery industry is labor, technology and capital-intensive industries, its own sub-sectors within the high correlation between, but it is also dominated by heavy industry; with the upstream industry (such as steel, coal, nonferrous metals, etc.) and downstream industries (such as housing, consumer goods, etc.) are closely related, has a strong pulling ability. At this stage, China"s machinery industry demand for the product mainly by domestic demand, but in recent years, the high export growth rate exceeded our expectations. The rapid development of China"s macro economy in 2007, in its lead, machinery industry is the high-speed operation. First half of the machinery industry all the way rosy. According to Wind Info (Wind information) statistics, 136 listed companies in the first half of comparable machinery industry achieved a total income of 143.867 billion yuan, up 33.02%; to achieve the main profit of 25.114 billion yuan, up 30.72%; net profit of 10.901 billion yuan, an increase of 57.64%. Machinery companies on average gross margin of 17.19%, higher than the industry average of 2.24 percentage points. Over the past three years, the machinery industry average net profit margin of listed companies is relatively stable overall, first half of 2007 has been significantly increased, the level of net profit margin reached 7.42%, compared with the end of 2005 and the end of 2006 rose 2.88 percentage points and 1.76 percentage points.electromagnetic vibrating feeder:http://www.crusher-machine.com/n211.html crushing plant:http://www.crusher-machine.com/1.html The industry believes that, by organic growth, epitaxial growth, return on investment to jointly promote, the whole machinery industry in the first half of the performance of listed companies increased significantly; in the second half and even the next two years, listed companies within the industry"s gross margin, net profit margin level will become to stability. Common grinding process the type of grinding process although many, but according to a pre-grinding fineness and grading, inspection classification, grade control to set the conditions, the grinding process used the following four. Grinding process, grinding process selection options commonly used, mainly to solve the problem: to determine the grinding segments; the need for pre-classification; need to check grade; the need for such control levels. Taught to determine the grinding section. Concentrator grinding is one of the key production processes do not only directly affect the election results. Zhengzhou Hongxing Machinery is fammous for its grinder machine.The grinder machine from Hongxing are superior in quality. And there are many types,such as raymond mill, rod mill, hygh pressure micro grinding machine, which are the popular one with long history.