Raymond Mill also is named as powder making machine, grinding mill, pulverizer,etc.Raymond Mill is ideal grinding mill for grinding and processing the materials such as limestone, gypsum, barite, carbonate calcium, marble, feldspar, dolomite, granite, kaolin, bentonite, bauxite, etc. After being grinded by the raymond mill, the powder output size can be from 30 mesh-325 mesh, and the powder output size is adjustable. Raymond Mill /Grinding Mill Working Principle: 1. Raw material is crushed by jaw crusher to the size required which is suitable for the Raymond Mill / Grinding Mill, 2. Then the crushed materials are elevated into a hopper from which the material is transported through the electro-magnetic vibrating feederevenly and continuously into the grinding chamber for grinding mill. The rollers oscillate outward to press the ring because of the centrifugal force and the shovel scoops up the materials, send to the middle between ring and roller to accomplish the grind. 3. Then, the ground stuff are carried by the air from the blower into the powder separator (Analyzer Machine) for screening. The fine powders are blow into the cyclone powder collector and are poured out through the output-powder valve as the final products, and the corase stuff after the screening will be recycled back into the grinding chamber for regrinding. The sets airflow system is closely sealed up and circulated under condition of negative and positive pressure.
Raymond Mill also is named as powder making machine, grinding mill, pulverizer,etc.Raymond Mill is ideal grinding mill for grinding and processing the materials such as limestone, gypsum, barite, carbonate calcium, marble, feldspar, dolomite, granite, kaolin, bentonite, bauxite, etc.
2. Then the crushed materials are elevated into a hopper from which the material is transported through the electro-magnetic vibrating feederevenly and continuously into the grinding chamber for grinding mill. The rollers oscillate outward to press the ring because of the centrifugal force and the shovel scoops up the materials, send to the middle between ring and roller to accomplish the grind.
3. Then, the ground stuff are carried by the air from the blower into the powder separator (Analyzer Machine) for screening. The fine powders are blow into the cyclone powder collector and are poured out through the output-powder valve as the final products, and the corase stuff after the screening will be recycled back into the grinding chamber for regrinding. The sets airflow system is closely sealed up and circulated under condition of negative and positive pressure.
From 1906 to today, Raymond mill development than a century, was originally used as a coal grinding equipment Raymond mill , continuous development and innovation , has been widely used in various industries. we look over a hundred years Raymond mill history of the development , which has been constantly adapt to a variety of needs, but also because the process is simple, reasonable structure, easy maintenance , which is widely favored by the milling industry , Raymond mill in milling industry is essential.
The whole structure of Raymond mill is composed of a host machine, analysis, plumbing, air blower, finished cyclone separator, jaw crusher, bucket elevator, electromagnetic vibration feeder, electric motors and other components. The host is composed of a frame, Raymond mill inlet volute, blade, grinding, grinding ring, a cover casing and a motor.
The whole working process of Raymond Mill (the process of grinding material): the bulk materials by jaw crusher to desired size, by the elevator will be material to the hopper, the vibrating feeder evenly and quantitatively and continuously into the indoor host grinding grinding, grinding after the powder is fan airflow. Through the analysis of machine grading, fineness of powder will meet with the gas flow through the pipe into the large cyclone collector, were isolated and collected, then powder tube is finished powder. The airflow from large cyclone collector inhalation top return air duct blower. The air current of the whole system is a closed loop, and circulation in the flow of positive and negative pressure condition.
In the grinding chamber internal grinding material with certain water content, the grinding heat generated in grinding chamber gas evaporation changes the gas flow rate, and the pipeline connection is not tight outside the gas is inhaled, the circulating air volume increase, is this by adjusting the fan with the host legacy of pipe to flow balance, and the gas into the small cyclone collector excess, the fine powder gas into the collection down, then the cyclone collector upper exhaust pipe into the atmosphere, or into the dust collector with the exhaust gas purification.
The 65Mn: grinding ring in the use of this material, the durability is improved obviously. It is characterized by high hardness, good wear resistance, magnetic. Mainly used for product in powder processing of iron. The product after normalizing and tempering heat treatment, mechanical performance is improved greatly, make the product not only has good wear resistance, but also greatly improve the toughness.
The Mn13: compared with 65Mn, the grinding ring in the Mn13 material after casting, in life has changed. After the pouring of water toughening treatment. Water toughening treatment after casting with tensile strength, toughness, high plasticity and no magnetism. The grinding ring is more durable. Subject to severe shock and strong pressure deformation in the using process, surface hardening, and martensite formation, thus forming the wear surface layer high, while the inner layer to maintain excellent toughness, even wear very thin, can bear a larger impact load.
Raymond mill host another vulnerability is grinding roller, under normal circumstances, Raymond mill for grinding roller in use for some time, this according to customer's materials, frequency of use and other factors to determine whether the operation. To limestone as an example, if the same operating conditions, the quality of the grinding roller but hard, then there will be excessive wear, the service life is greatly reduced. As a result, mill roll material is also one of the most important factor in deciding the quality of equipment manufacturers of Raymond mill.
Impulse dust removal equipment is configured for loading, grinding, finished product transportation and storage, to ensure that the production site is clean and environmentally friendly, and there is no dust pollution.
After signing the order, formulate detailed plans for production, preparation and delivery, basic production, and engineer dispatch, installation and commissioning, to ensure that the entire link is carried out in an orderly and efficient manner, and the final delivery is guaranteed.
[Improvement]: All important parts of raymond mill are made of high-quality steels, and all wear-resistant parts are made of high-performance wear-resistant materials. The whole machine has high wear resistance and reliable operation.
Resilient coupling between the main engine and separator can reduce the vibration and noise and improve the service life of equipment. Because of connecting crushing, drying, grinding, classifying and transmission together with the simple system and compact layout, it covers about 50% of the area of the ball mill system and can be outdoor arrangement, which can reduce the investment cost a lot;
Milling roller devices adopt superimposed multistage seal with excellent seal performance. Unique air circulation system with advanced dust remover carries the environmental protection concept through to the end;
Impeller devices with high density and high precision increase more than 50% of finished product yield under the same power. Efficient and energy-saving centrifugal induced draft fans improve the efficiency of induced draft fans greatly.Convenient impeller adjusting devices improve the precision of the finished product.
Large bulk materials crushed by thejaw crusher to the needed size are fed into the storage hopper by a mine hoist and then fed into a grinding chamber of main engine uniformly, quantitatively and continuously by a electromagnetic vibrating feeder for grinding. Grinded materials are blown into separator by blower for classification. With the function of impellers in the separator, materials without meeting the requirements of the fineness are fallen into a grinding chamber for grinding again; materials meeting the requirements of the fineness are blown into a cyclone powder collector with airflow through pipelines for separation and collection. The powder from a discharging device is the finished product. Separated airflow is back to blower through return duct on the top of the cyclone powder collector.
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 Mill system.
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.
Raymond mill produced by our company use of fine milling equipment for closed cycle, from the rough processing of raw materials to delivery to the milling and the final packaging, can become an independent production system. Compared with the traditional grinding equipment, its through the screening rate is as high as 99%.
Raymond millis made by high quality abrasion resistant material, machining process with fine craftsmanship, strict, greatly enhance the durability of the whole equipment. In order to save the labor cost for the customer, improve the degree of automation equipment, it is configured in electrical system of centralized control, can realize unmanned operation effect.
Raymond mill by several major components host, analysis machine, blower, finished cyclone, plumbing fixtures, electrical and other components. Where the host from the rack, inlet volute, blade, roller, grinding ring, casing and motor.
In a complete Raymond mill production line, in addition to milling machines and other major equipment, but also requires a lot of auxiliary equipment, such as jaw crusher, bucket elevator, electromagnetic vibrating feeder, cabinet and so on.
When at work, Raymond mill machine will first crushed material from the feed hopper side hood entered the studio of Lei Mengmo inside the processing machinery. With the grinding roller device in the host central flower on suspension in the processing in the studio, the grinding device can continuously around the axis perpendicular to the direction of motion do revolution. In addition, the grinding roller device will do the autobiography priming. This design makes the grinding process of materials have more movement, making the material more efficiency of grinding, grinding fineness much higher due to the rotation produces centrifugal force, so the grinding roller device under the action of centrifugal force will continue to swing outside, in the process of swinging will constantly pressed Raymond mill machinery another extremely important machining parts grinding ring. Blade at this time will continue to be material to roll grinding device and grinding ring, roll grinding device and grinding ring rolling compaction of material in the process will continue in operation, reach the final goal for crushing material.