Grinding Mill

Based on the production demands of millions of customers, ZENITH has developed the industrial milling machines which cover fully the crude powder, fine powder and ultrafine powder. The tens of years of customer service experiences make ZENITH learn better the customer's investment ideas and considerations so as to provide specific solutions.

Raymond Mill History

Raymond Mill, also known as Raymond Mill, English full name: Raymond mill. It applies to a variety of mineral powder preparation, pulverized coal preparation, such as raw materials, gypsum mine, coal and other information of fine powder processing. Raymond Mill, Raymond Mill, efficient Raymond Mill, high pressure roller mill.

the history of Raymond Mill

In 1906, CVGrueber founded the Curt Von Grueber machinery factory in the southern suburbs of Berlin, using the patents he made in the United States to produce the first Maxecon mill and used the MOABIT power plant in the Berlin area as a milling equipment, Up to 5T /H, sold within a few years nearly 600 units, were used in different areas of professional grinding category. The same period BEWAG plans to build a higher value of coal mill. E.C.

Loesche shares and in charge of the Curt Von Grueber machinery after the decision to purchase the United States to expose the raymond centrifugal ring roller mill patent, produced the first generation Raymond Mill system. Its structure is in the machine base erected with a rotating frame with a plum blossom rack, plum rack hanging on the three or more self-rotating roller, the rotation of the rotating speed of the rotating drum to the outside roll, And is driven by centrifugal force to the grinding ring embedded in the inner wall of the cylinder. When the material enters the grinding area, it is brought to the front area of ​​the roller under the action of the plow guide under the roller. The grinding force (centrifugal force) of the Raymond mill grinding mill is limited by the roll diameter and speed of the roller, which is suitable only for soft, low ash and abrasive materials. Germany's coal is hard, the ash is high, the demand for higher grinding force, this structure of Raymond coal mill is difficult to meet the demand for grinding, so Raymond coal mill in Germany did not get through. And at that time Raymond coal mill just suitable for the US coal demand grinding, and thus Raymond coal mill in the United States at that time has been widely promoted and applied.

1925 ECLoesche summed up the use of the first generation of Raymond coal mill features and disadvantages, the resolution to further improve the Raymond mill grinding structure, developed a grinding principle and the opposite of the mill, called For improved Raymond Mill. The main structural features are bowl-shaped grinding ring reversal, grinding roller using mechanical tension spring load pressure to add grinding strength, the material from the base into the bowl-shaped grinding ring by rotating centrifugal force into the roller. The roller shaft is fixed on a one-way movable rocker, and each rocker arm is controlled by a moderable tension spring. This type of improved Raymond mill system has two modes of positive pressure and negative pressure direct blowing. This type of Raymond Mill patent was soon purchased by the American Combustion Engineering Company (Combustion Engineering). Due to the improvement of the type of Raymond mill there is still a question of ring roller mill, although the roller diameter is slightly added, but the grinding force is not added. Later, the United States incineration engineering company Raymond branch and in this foundation on the development of a new generation of Raymond Mill, known as VR grinding. This Raymond mill is similar in many respects to the structure of the Lecce mill. It is noteworthy that it is not the same as the Lecce grinding cone and the surface of the disc, and the use of cylindrical roller and with a 15 degree angle tilt grinding the appearance of the disc. The roller has a roller that is similar to the Lacey mill and is equipped with protective equipment to prevent metal touch between the roller and the disc. The grinding roller can be lifted in advance before the mill is started, which can reduce the starting torque of the motor. Raymond Mill in the United States industrial use, usually used to prepare pulverized coal, the fineness of goods in the 250-325 mesh between the process can be carried out in the process of commodity fineness and output value of the conditioning operations.

Raymond Mill knowledge

Hardness vs. Mohs hardness

Hardness: Because it is a damaging test, it is used for unmounted original stone or not valuable ore. There are two types of hardness specifications, one is the degree of hardness, the other is the Mohs hardness (a relative hardness).

Mohs hardness: the more common ten kinds of minerals as a standard with each other to distinguish between the pros and cons of what is better, habit of mineralization or gemology are used Mohs hardness.

Mohs hardness is divided into ten grades. Talc, gypsum, calcite, fluorite, apatite, feldspar, quartz, topaz, corundum, diamond.

is usually the size of the pore size of the sieve, the conversion formula is:

cm = 16 /mesh

There are English and American, and English refers to the number of holes per square inch.

The new ultra-fine Raymond Mill and the traditional Raymond Mill's comparison: Raymond Mill is also called Raymond Machine, Mill, Ray Mill, High Pressure Hanging Roller Mill Full name: Raymond mill, Powder equipment. Raymond Mill is one of the most important equipment for extensive use with mine, cement plant, chemical plant grinding equipment, deep metal processing. Because Raymond Mill is stable, adaptable, cost-effective, since the introduction of China for more than 20 years, has been used in non-metallic mineral processing. However, with the non-metallic mineral quality in the field of ultra-fine powder to carry out a wide range of applications, non-metallic mineral products business demand is getting higher and higher. Especially for the fineness of the commodity has a higher demand. This makes the traditional Raymond mill seem powerless. Traditional Lei Meng grinding of these questions have been confused with the mineral processing enterprises and equipment manufacturers. These questions are mainly manifested in:

  • 1. Commodity fineness is low, usually Raymond grinding fineness is usually below 500 mesh, these devices can only occupy the lower end of the powder use of shopping malls.
  • 2. Mechanical problems are high, power consumption, noise, emissions of large pollution
  • 3. System power is low, the collection system of goods is not ashamed of the role of a lot of fine powder can not be useful to collect and repeat the cycle within the system constitute a lack of power
  • 4. The main wind box duct design errors, into the grinding area of ​​the larger particles in the material and the future grinding and grinding of the particles are often thrown into the bellows set in the tail of the volute, and continue to extend forward, so that the amount of air over Cut, easy to constitute a traffic jam, no powder or less powder, affecting the output value.