E.C.Loesche Contributes to New Type Raymond Grinder

Because of Raymond mill coal slow roll grinding force (centrifugal force) is limited by a roller roller diameter and rotational speed, the grinding at the time is only applicable to soft, low ash and coal quality material with good sex of grinding, and Germany's coal is hard, ash content and high, need higher grinding force and the structure of Raymond coal mill is difficult to meet the requirements of grinding, hence Raymond coal mill not gained popularity in Germany.At a time when Raymond coal mill is suitable for the coal grinding requirements, hence Raymond coal mill in the United States had been widely promotion and application.
1925 E.C.L oesche summarizes the use of the first generation of Raymond coal mill, which is one main kinds of marble grinding mill, characteristics and structure defects, decided to further improve the Raymond mill grinding structure, developed a contrary to the mill grinding principle, called the modified Raymond mill. Main structure of this marble grinding mill is a bowl of ring, roller using mechanical spring load pressure increase grinding force, material feeding bowl shaped by the center ring by rotating centrifugal force in grinding roller. Roller roller fixed on a rocker arm can be a one-way activity, each radial grinding force is controlled by adjustable spring.The improved ventilation of the Raymond mill system of marble grinding mill has positive pressure and negative pressure straight down in two ways.

This type of marble grinding mill patent shortly Combustion Engineering company (Combustion Engineering).Ring still exist due to improved Raymond mill roller mill, although the roll diameter increases slightly, but not grinding force increases.Later, Raymond branch and combustion engineering companies in the United States on the basis of developing a new generation of Raymond mill, referred to as VR grinding.The Raymond mill and was in many ways the structure is similar.It is worth noting that it is different from was tapered roller and plane grinding mill, and the use of cylindrical roller and belt with a 15 degree Angle of tilt on the surface of the grinding mill.Roller during inspection and maintenance has to dig out the similar grinding roll, and equipped with protection device, in order to prevent the metal contact between the roller and a millstone.
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