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The Origin of Raymond Roller Mill

From : clirik    Date : 2018-09-07 16:16

Raymond roller mill
Raymond roller mill, also known as the suspension roller grinding mill, the full name of English: Raymond roller mill, is a kind of milling machine imported from abroad.

1. Who invented Raymond Roller Mill?


In 1906, C.V.Grueber founded the Curt Von Grueber machinery factory in the southern suburbs of Berlin. Using his patents in the United States, he produced the first Maxecon mill and used it as a coal-fired equipment for the MOABIT power station in BEWAG in Berlin. The grinding energy can reach 5T/ H, sold nearly 600 units in a few years, respectively, used in the field of grinding in different industries. After E.C. Loesche became a shareholder and headed the Curt Von Grueber machinery factory, he decided to purchase the US patented raymond centrifugal ring roll mill to produce the first Raymond roller mill system.

However, since the grinding power (centrifugal force) of the Raymond grinding wheel was limited by the diameter and speed of the grinding roller, the grinding was only applicable to soft, low ash and easy-grinding coal materials at that time. The German coal is harder, the ash is higher, and the higher grinding power is required. The Raymond coal mill of this structure is difficult to meet the grinding requirements, so the Raymond coal mill has not been popularized in Germany. At that time, Raymond coal mill was suitable for the grinding requirements of American coal, so Raymond coal mill was widely promoted and applied in the United States.

Raymond roller mill for sale
2. Who improved Raymond Roller Mill?


In 1925, E.C.Loesche summarized the use characteristics and structural drawbacks of the first generation Raymond coal mill, decided to further improve the grinding structure of raymond roller mill, and developed a grinding machine with the opposite principle of grinding, called improved type. Raymond roller mill. The improved Raymond roller mill system has two modes of ventilation: positive pressure and negative pressure. This type of Raymond roller mill patent was soon purchased by Combustion Engineering. Since the modified Raymond roller mill still has the problem of ring roll grinding, although the roll diameter is slightly increased, the grinding power is not increased much.

Later, the Raymond branch of the American Combustion Engineering Company developed a new generation of Raymond roller mills, called VR mills. This Raymond roller mill is similar in many respects to the structure of the current Loesche mill. It is worth noting that it differs from the Loesche mill cone and the face grinding disc, but uses a cylindrical grinding roller and a grinding disc with a 15 degree angled inclined grinding surface. The grinding rolls have a roll-out device similar to the Loesche mill during inspection and repair, and are also equipped with protective devices to prevent metal contact between the grinding rolls and the grinding disc. In addition, the grinding roller can be lifted in advance before the mill is started, which can reduce the starting torque of the motor. Raymond roller mill is commonly used in industrial applications in the United States to prepare pulverized coal. The fineness of the product varies between 250 and 325 mesh, and the product fineness and yield can be adjusted during operation.

Since May 31, 1995, Raymond roller mill has been the first to draw patents under the product name. It has been nearly 15 years old. With years of development and improvement, the types and models of Raymond roller mills are becoming more and more Many, due to the stable performance, strong adaptability and high cost performance of Raymond roller mill, China's introduction has been well received by users for many years, occupying a very important position in the crushing equipment.

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