What is Raymond? Raymond also known as Raymond Mill industrial milling machine series, the English name: Raymondmill. It is suitable for all kinds of ore preparation, coal preparation, such as raw material powder processing ore, gypsum ore, coal and other materials. Raymond, Raymond mill, Raymond efficient, high pressure rotary roller mill. 1906 CVGrueber created in the southern suburbs of Berlin, Curt Von Grueber machinery manufacturing [1] plant, he obtained the use of patents in the United States produce the first station Maxecon mill, and for BEWAG in Berlin's MOABIT station equipment industry as coal grinding mill series, grinding energy of up to 5T / H industrial milling machines, a few years sold nearly 600 units, respectively applied to the grinding areas of different industries. BEWAG proposed construction year higher yield coal mill. After ECLoesche shares and director Curt Von Grueber machinery factory decided to buy raymond centrifugal US patent discloses a ring roller mill, produced the first generation of Raymond system. The structure was erected in the center of the machine with a belt holder with rotating spindle plum, plum rack hanging three or more rotation roller rotating shaft driven at a constant rotational speed roller swings out, and In the centrifugal force of driving under the pressure mounted on the cylinder wall of the grinding ring. When the material into the grinding area under plow-shaped guide roller blade material beneath the action is brought to the front area of ??the roller. Since Raymond coal mill roller mill grinding force (centrifugal force) is restricted grinding roll diameter and rotation speed of the mill at the time only available in soft, low ash content and grindability good coal quality materials, and Germany hard coal quality, ash content and high industrial milling machine, a higher grinding force, Raymond coal mill grinding this structure is difficult to meet the requirements, so Raymond coal mill in Germany have not been universal. At that time, just for the United States Raymond coal mill grinding coal quality requirements, so Raymond coal mill was in the United States has been widely promoted and applied. 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 scales, one is the absolute hardness, and the other is a Mohs hardness (a relatively hardness) Mohs hardness: Ten to common mineral used as a standard by scratching each other hard to distinguish what what 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 English and American, British refers to the number of holes per square inch; large industrial mill industrial milling machines _ _ Lei Lei machinery is provided by Zhengzhou Machinery Co., Ltd. Zhengzhou Lei Machinery Co., Ltd. (www.hnzljx.net) (www.hnzljx.net) to provide "Raymond, grinder, milling machine" and other services, the company has "Lei" and other brands. Focus on crushing grinding equipment and other industries, in Zhengzhou, Henan Province has a higher visibility. Welcomes inquiries, Contact: Manager.