The Origin And Working Principle Of Raymond Mill
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The Origin And Working Principle Of Raymond Mill

Posted: 2018-08-29

Raymond mill, also known as suspension roller grinding mill. Raymond Mill is a grinding machine that is widely praised and loved by users in the mill industry. However, when customers use Raymond mill to expand production and bring substantial economic benefits to themselves, how much do you know about Raymond Mill? Today, let's talk about the development of Raymond Mill.
Raymond Mill is a kind of milling machine imported from abroad. It is currently produced in China. It is suitable for various mineral powder preparation and pulverized coal preparation, such as fine powder processing of raw material ore, gypsum mine and coal.

Raymond Mill.jpg

1. Who invented Raymond Mill?

In 1906, CVGrueber 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 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.

2. Who improved Raymond Mill?

In 1925, ECLoesche summarized the use characteristics and structural disadvantages of the first generation Raymond coal mill, decided to further improve the grinding structure of the raymond mill, and developed a grinding machine with the opposite principle of grinding, called improved type. Raymond mill. The improved Raymond mill system has two modes of ventilation: positive pressure and negative pressure. This type of raymond mill patent was soon purchased by Combustion Engineering. Since the modified Raymond 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 mills, called VR mills. This Raymond 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 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 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 mills are becoming more and more Many, due to the stable performance, strong adaptability and high cost performance of Raymond mill, China's introduction has been well received by users for many years, occupying a very important position in the crushing equipment.

3, Raymond mill works principle

The working principle of Raymond mill is to add the material to be pulverized from the feeding hopper on the side of the hood to the machine, and to revolve around the vertical axis by the grinding roller device suspended on the main plum frame of the main machine, while rotating itself, due to the rotation By the action of the centrifugal force, the grinding roller swings outward and presses against the grinding ring, so that the blade shovel the material to the grinding roller and the grinding ring, and the purpose of pulverizing the material is achieved by the rolling and rolling of the grinding roller.

Raymond Mill working principle.jpg

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