Raymond, also known as hanging roller disc refiner, English name: Raymond mill, passed in from abroad a flour mill, but now it has become China's non-metallic mineral processing an important grinding equipment !
Raymond mill shape
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 to produce the first Maxecon mill and the MOABIT power station in BEWAG in Berlin as a coal grinding machine with a grinding energy of up to 5T/H. In the past few years, nearly 600 units have been sold, which are used in the field of grinding in different industries. After ECLoesche 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 drawbacks 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 the improved mine. Mongolian. 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.
With years of development and improvement, the types and models of Raymond mills are also increasing. Due to the stable performance, adaptability and high cost performance of Raymond mills, China's introduction has been well received by users for many years. The device occupies a very important position.
3, Raymond mill works
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 When the centrifugal force acts, the grinding roller swings outward, pressing 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 rolling of the grinding roller.
At present, there are many domestic manufacturers of Raymond mills, such as Guilin Hongcheng Mining Equipment Manufacturing Co., Ltd. and Shanghai Shibang Machinery Co., Ltd. There are also many models, such as suspension roller type Raymond mill, vertical Raymond mill, R-type Raymond mill, etc. Raymond mill has outstanding advantages, strong applicability and high market share.
4, Raymond mill application range
Raymond widely used silica, talc, marble, limestone, dolomite, lime, activated clay, activated carbon, bentonite, kaolin, cement, phosphate rock, gypsum, graphite, glass, manganese ore, titanium ore, copper ore, chrome ore , refractory materials, insulation materials, china clay, titanium dioxide, iron oxide, etc. Mohs hardness of 9.3 or less, 6% or less moisture in the non-flammable mineral, architectural, chemical, fertilizer and other industries in a variety of materials 300 High-fine powder processing, the finished product size is in the range of 60-325 mesh (0.125 mm - 0.044 mm), and the minimum fineness of a small part of the material can reach 1000 mesh (0.013 mm) as needed.
5, Raymond mill features
Although different types of Raymond mills have their own advantages, performance characteristics are not the same, but generally Raymond mill has the following characteristics:
(1) The entire Raymond mill is a vertical structure with a relatively small footprint, strong system and strong set of integrity. It can be self-contained independently from rough processing or conveying of raw materials, milling and final packaging. Production system.
(2) Compared with other milling equipment, Raymond mill has a high screening rate, and the finished grain size screening rate after Raymond grinding can reach more than 99%, which is not achieved by other milling equipment.
(3) The electromagnetic vibration feeder is uniform in feeding, easy to adjust, small in size, light in weight, energy-saving and power-saving, and easy to maintain.
(4) The electric control adopts centralized control and advanced selection, and can realize unmanned operation in the host computer room.
(5) The main drive unit adopts a closed reducer, which has stable transmission, reliable operation and no leakage of oil.
(6) The main blade holder is always in contact with the material during operation, so the blade holder is composed of upper and lower parts. After the lower seat is worn, the disassembly connection bolt can be changed.
(7) The important parts of Raymond mill are made of high-quality castings and profiles. The craftsmanship is fine and the rigorous process ensures the durability of the whole set of equipment.
6. Problems with Raymond Mill
With the extensive development of non-metallic minerals in the field of ultra-fine powder applications in recent years, downstream enterprises have higher and higher requirements for non-metallic mineral products, especially for product fineness. Some problems with traditional Raymond mills have plagued mineral processing companies and equipment manufacturers. These problems are mainly manifested in:
(1) The fineness of the product is low. The fineness of the ordinary Raymond mill is generally below 500 mesh. These devices can only occupy the lower-end powder application market, and are not suitable for the future development of the powder industry in China.
(2) The mechanical failure rate is high, the power consumption is large, the noise is large, and the emission pollution is large.
(3) The system efficiency is low, the separation effect of the product collection system is not ideal, and a large amount of fine powder cannot be effectively collected and repeated in the system to waste power.
(4) There are mistakes in the design of the main air box air duct. The larger particles entering the material of the grinding area and the particles that have been ground in the future are often thrown into the bellows and gathered at the tail of the volute, and continue to extend forward, so that the amount of over-wind is gradually reduced. Easy to cause traffic jams, no powder or less powder, affecting production.
In order to solve these problems and adapt to the needs of the market, many Raymond mill manufacturers have improved and improved the traditional Raymond mill. Through the efforts of Chinese manufacturers and R&D personnel, these problems have been improved. Grinding began to occupy the market. However, due to the different qualifications of various enterprises, new technologies cannot be applied in some enterprises with limited scale and weak R&D capabilities. Therefore, some problems still exist in the Raymond mill market in China to a certain extent.
In fact, since the introduction of the first Raymond mill in China, related companies have been working on the improvement of Raymond Mill. The technical improvement work of Raymond Mill in China tends to be more efficient and practical. The inevitable need of China's market is also the inevitable development of the Raymond mill industry.
7, the development trend of Raymond Mill
In recent years, China's milling equipment industry has developed very rapidly. The grinding machine manufacturing has been quite sophisticated. It is not only simple in production structure, easy to operate, easy to maintain, but also pays more attention to the diversification of equipment performance. The cost performance has also been greatly improved. In addition to continuous improvement of the mill equipment model, China has also greatly improved the control level of the mill.
There have been two changes in the development of China's mineral processing equipment manufacturing industry:
First, product development has changed from imitation to independent innovation;
Second, the economic operation has changed from extensive to efficient.
With the continuous development of the powder industry, the market demand for Raymond mill is also increasing. Raymond Mill is the main equipment for grinding in China's powder industry. In order to meet the requirements of different application fields, it is an inevitable trend to develop "high reliability, energy saving, precision and automation".
(1) More energy saving and environmental protection
In recent years, all walks of life have paid more and more attention to green environmental protection issues. Energy conservation and environmental protection have become the vane of the development of various industries, especially in the Raymond mill industry.
With the increasingly strict requirements of green environmental protection, the state encourages the development and processing of Mining Industry, and at the same time has high standards for mining machinery. The research and development and manufacturing of Raymond Mill should pay more attention to research on high efficiency and energy saving, aiming at zero pollution and high Improvements in manufacturing, such as efficiency, low energy consumption and mechanical life. As far as the Raymond mill market is concerned, energy-saving and environmental protection equipment with large processing capacity, high sorting efficiency and low energy consumption will be more popular, and the market demand is more urgent.
(2) The automatic control system is more perfect
Raymond Mill will be developed in the powder industry mainly for high reliability, precision, automatic condition monitoring and automatic control.
It can adopt measures such as thyristor power supply, AC frequency conversion speed regulation, grease centralized lubrication, shock absorption, etc., and has equipment for condition monitoring and automatic control of microcomputer. Among them, the high reliability needs to be studied through the rationalization of the mechanical principle to enhance the wear resistance of the grinding ring, the lower gland, and the like, and improve the lubrication of the machine before the next bearing in the continuous working state.
Experts believe that automatic condition monitoring and automation control need to add a high-intelligent electronic control system inside the Raymond mill to automatically control the ingress and egress, grinding, and quantification of materials. Automatic control can effectively improve the efficiency and safety of the Raymond mill, and the operator only needs to control the buttons in the operation room.
(3) Grinding accuracy will be greatly improved
With the continuous improvement of the fineness requirements of powder products in the application field, the milling equipment industry is bound to develop in the direction of refinement and scale, and Raymond Mill is no exception.
For a long time, Raymond mill products have rarely made breakthrough improvements. Although the grading system has been greatly improved, most of them have stayed in the single machine transformation. As a formal product of the production equipment manufacturers, there are not many, in many parameters, for example. The size of the grinding roller ring, the power of the main engine and the spindle speed have rarely surpassed. In fact, the traditional Raymond mill has many potentials to be tapped.
Increasing the accuracy of material grinding requires an increase in the accuracy of the analyzer. This problem has always been a technical difficulty in the improvement of Raymond Mill, but it is also one of the main bottlenecks in the development of Raymond Mill. Therefore, the grinding precision of Raymond Mill in the future will be the research and development focus of related companies and R&D personnel, which will also be the key to determine the future development of Raymond Mill in the mill industry.
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