Raymond (Raymond) common sense: Hardness: Because it is destructive test, so the unground of the original stone or precious of minerals can be used. There are two types of hardness scale mill, one is the absolute hardness, and the other is the Mohs hardness (a relatively hardness) Mohs hardness: Ten to common mineral to scratch as standard with each other in order to distinguish what what hard soft, it is customary on mineralogy or gemology is Mohs hardness. Mesh sieve pore is a general characterization of the size of its conversion formula is cm = 16 / mesh, mesh has British and US vertical milling machine, refers to the number of imperial holes per square inch; installation and maintenance of the machine maintenance is an extremely important regular work, it should work closely with most of the operations and maintenance, etc., should be full-time personnel on duty checks. 1 machine maintenance, machine bearing shoulder the entire load high pressure mill, so good lubrication of the bearing life of a great relationship, it directly affects the life and the operation rate of the machine, which requires the injection of the lubricant must be clean, seal We must be good at the main oiling the machine (1) Turn bearing (2) roller bearing (3) all gears (4) activities bearings, sliding plane. 2, the newly installed tire prone to loosening must always be checked. 3, note that each part of the machine is working properly. 4, pay attention to check the wear of wear parts, pay attention to replacement of worn parts. 5, release of the active device chassis plane should avoid activities out dust and other materials bearing can not move the machine on the chassis can not meet the crushed material, so as to cause a serious accident. 6, bearing temperature rise, should immediately stop check the reason to eliminate them. 7, the rotation of the gear in operation should be immediately stopped if the impact of sound check and eliminate high pressure mill, Lei machinery (online consultation), mills supplied by Zhengzhou Machinery Co., Ltd. Lei. Zhengzhou Lei Machinery Co., Ltd. (www.hnzljx.net) (www.hnzljx.net) is a leader in Zhengzhou, crushing grinding equipment, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum Limits to meet customer needs. In Lei machinery leadership with the staff warmly welcome all inquiries negotiations to create the better future Lei machinery.