raymond mill, development history of raymond mill
Materials: Barite, calcite, potash feldspar, talc, marble,
limestone, dolomite, fluorspar, lime, activated clay, activated carbon, bentonite,
kaolin, cement, phosphate rock, gypsum, etc.
Applications: Metallurgy, chemical engineering, building materials,
mining, pharmacy, cosmetics and other fields
In 1906, C.V. Grueber founded a machinery factory in the southern suburbs of Berlin. Using his
patents obtained in the United States, he produced the first Maxecon mill and used it as the
coal grinding equipment for the MOABIT power station. The grinding power can reach 5TPH. In the
past few years, nearly 600 units have been sold and used in different industries. In the same
period, BEWAG planned to develop a coal mill with a higher output. After E.C. Loesche took over
and headed the C.V. Grueber Machinery Plant, he decided to purchase the patented Raymond
Centrifugal Ring-roller Mill from the United States to produce the first generation of Raymond
However, practices proved that the fineness of finished products produced by Raymond Mills was dissatisfactory. Usually, the fineness was about 400 meshes, with very little materials fineness up to 1000 meshes, which did not meet the requirements of refined development. This kind of Raymond mill was only suitable coal materials with soft, low ash and good grinding property, because the grinding force (centrifugal force) of Raymond coal grinding mill was limited by the diameter and rotation speed of grinding roller at that time. However, German coal was characteristic of hard and high ash content, which required higher grinding power. Therefore, Raymond mill of this structure wasnt prevalent in Germany as itwas difficult to meet the grinding requirements. But it was surprising that this kind of Raymond mill was just suitable for the coal quality in the United States, there was no doubt that Raymond mill was widely promoted and applied in the United States.
In 1925,E.C.Loesche summarized the use characteristics and disadvantages of the first generation of Raymond coal mill and decided to further improve the structure of Raymond mill. He developed a mill whose grinding principle is opposite to the first one, which was called improved Raymond mill.
The ventilation of this improved Raymond mill system has two modes: positive pressure and negative pressure direct blowing. The patent of this type of Raymond mill was soon acquired by Combustion Engineering (a company in America).
The structure of this Raymond mill was similar in many aspects to that of the current Loesche mill. However, it was different from Loesche mill on its cylindrical grinding roller and grinder table with a 15 degree sloping surface. The grinding roller was equipped with a roll-out device for inspection and maintenance. And it also equipped a protective device to prevent metal contact between the grinding roller and the grinding table. In addition, the grinding roller can be lifted in advance before the mill starts that can reduce the pull-in torque.
With the development and improvement over the years, there are more and more types of Raymond mills. Since China introduced this machine, Raymond mill has been well received by majority of users due to its high stability, well-adapted and highly cost-effective. So we can see that Raymond mill plays an important role in grinding equipment.
SBM has launched three upgrade series of Raymond Mills, MB5X Pendulum Roller Mill, MTW European Grinding Mill and MTM Medium-speed Grinding Mill respectively. Compared with the first generation of Raymond Mills, these three types of grinding mills are more energy-efficient and environmentally friendly, have more sophisticated automatic control systems, and can help users to move toward refined and large-scale development.
According to accumulation and experimental analyses of on-site test data for more than
thirty years, SBM, a Chinese grinding mill manufacturer, has researched and developed
the fifth-generation pendulous hanging grinding mill MB5X grinding mill. All
non-combustible and non-explosive brittle mineral products whose Moh's hardness are
below Grade 7 and water content below 6% could be ground by this grinding mill.
MTW European Grinding Mill is innovatively designed through deep research on grinding
mills and development experience. It absorbs the latest European powder grinding
technology and concept, and combines the suggestions of 9158 customers on grinding
mills. This grinding mill perfectly satisfies the production demands of the customers on
200-33m (80-425Mesh) fine powder.
MTM Medium-speed Grinding Mill is a world leading tool for powder grinding. MTM grinding
mill absorbs world first-class industrial powder milling technology and organizes the
technical experts and related engineers for elaborate design, test and improvement.
After jaw crushers break large bulky materials to smaller ones, elevators work to send
materials to the hopper. Then, by electromagnetic vibrating feeders, broken materials
are evenly and quantitatively sent to the grinding chamber of MTM Medium-speed Grinding
Mill. After grinding, materials are blown away by airflow to the powder concentrator for
classifying. Under the action of the impeller of powder selector, materials which fail
to meet fineness would be sent back to grinding chamber to get another grinding while
qualified powders would be collected by cyclone powder collector and discharged from the
bottom as finished products. And, after that, the airflow would go into the fan along
with the air return duct at the top of cyclone power collector. This system adopts a
closed circuit and runs under positive and negative pressure.
Because materials have a certain content of moisture, heat generated during grinding may
lead air evaporation or swell in the grinding chamber so that the amount of airflow
increases sharply. Besides, if the feed port and joints of pipelines are not sealed
well, external air may intrude the grinding mill and lead imbalance of airflow. So, SBM
arranges exhaust valves at the air outlet of the fan to induce redundant air into the
bag filter. After purifying, the redundant air is discharged. This arrangement can
achieve both the balance of airflow and the eco-friendly production.
Correct operation of the Raymond Mill is a must. Improper operation may cause damage to
the Raymond Mill and shorten its service life, which may cause considerable economic
losses due to long-term shutdown.
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raymond mills - raymond roller mill - grinding mill | agico cement
Raymond mill is also called Raymond roller mill. It is a new type of high-fineness grinding mill with high efficiency and closed circulation, which can completely replace the cement ball mill. This kind of machine is commonly used in cement plant for raw materials fine grinding, such as limestone, coal, gypsum, etc. Under normal conditions, these materials Mohs hardness should not be greater than 9.3 and the humidity should be under 6%. AGICO is one of the Raymond mill manufacturers in China. The Raymond roller mill we produced has the characteristic of stable performance, strong adaptability and high-cost performance. Its finished product fineness is usually between 0.61 and 0.033 mm, which can meet the requirements of different users.
When materials uniformly and continuously enter the machine body, they will be transported to the middle of the grinding roller and grinding ring by scraper blades,and during the grinding process, the materials will be stirred repeatedly by them. The grinding roller is tightly pressed on the grinding ring under the action of centrifugal force so that the material is crushed into powder under the action of grinding pressure, and then entered into the analysis machine by the cycle wind of the blower. After that, the qualified materials will pass through the analysis machine and enter the classifier for separation and collection. Otherwise, they will be sent back to the grinding disc for further grinding.
AGICO Group is an integrative enterprise group. It is a Chinese company that specialized in manufacturing and exporting cement plants and cement equipment, providing the turnkey project from project design, equipment installation and equipment commissioning to equipment maintenance.