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Vertical Roller Mill Performance Characteristics

LUM Ultrafine Vertical Grinding Mill

Why Choose Us ?

LUM Ultrafine Vertical Grinding Mill is a new ultra-fine grinding equipment developed by ourselves on the basis of common vertical mill and the latest Taiwan grinding roller technology and German milling technology based on our experience of mill production for many years. The LUM Ultrafine Vertical Grinding Mill is one of the first equipment in the production and processing industry of superfine powder production, which combines ultrafine grinding, classification and transportation.

A, the LUM Ultrafine Vertical Grinding Mill adopts the principle of material layer grinding, and the retention time of the material in the grinding is short, and the repeated grinding is reduced. The iron content of the finished product is very little. When it is used for grinding white or transparent materials, the whiteness and cleanness of the product is high.

B, a grinding curve specially designed for roller mill and liner, is designed for ultra-fine grinding. When used for ultra-fine powder grinding, it is easier to form a material layer than a conventional LUM Ultrafine Vertical Grinding Mill, so that the mill can be milled to the required fineness (0.045-0.02mm) at a time.

A, Multi wheel separator principle using the LUM Ultrafine Vertical Grinding Mill, and each rotor can be variable speed, the grinding fineness in the selected range can be, does not require a two grader, there is no inferior material.

B, Because the LUM Ultrafine Vertical Grinding Mill uses superfine grinding and multi wheel selection, it saves energy consumption by 30% to 50% compared with the ordinary mill when producing the same fineness grade products, and the economic benefit is excellent.

C, The reproducibility is very high in the production of multiple varieties.

A, The speed of the main engine of the LUM Ultrafine Vertical Grinding Mill is variable frequency speed regulation, and the applicable material is more extensive.

B, The LUM Ultrafine Vertical Grinding Mill is equipped with a mechanical limiting device and an electronic limiting device to prevent the direct contact between the roller sleeve and the grinding disc liner, avoiding the destructive impact and the violent vibration.。

C, The LUM Ultrafine Vertical Grinding Mill adopts the pressure control mode of PLC/DCS automatic control roller, and the grinding pressure is controlled accurately, and no manual operation is needed.

D, The lubrication of the grinding roller of the LUM Ultrafine Vertical Grinding Mill adopts a separate lubricating station, and the single grinding roller circuit adopts the mode of double pumps and pump suction at the same time. Even if the grinding roller bearings are fully lubricated and cooled, it can ensure that the inside of the roller bearing chamber will not cause leakage due to excessive oil storage.

E, The LUM Ultrafine Vertical Grinding Mill is equipped with automatic control system, which can realize remote control and easy to operate.

A, Because the grinding roller is not directly contact with the grinding disc in the work, and the grinding roller and the lining plate are made of high quality material, so the service life is long and the wear is less.

B, The grinding roll can be overhauled out to the outer shell of the machine. The replacement of the roll sleeve and the lining plate is convenient and fast, and the loss of the shutdown is reduced.

C, Small vibration, low noise, and the whole equipment is sealed, the system works under the negative pressure, no dust overflow, the environment is clean, to meet the national environmental requirements.

Who we are

The LUM Ultrafine Vertical Grinding Mill realized the grinding, grading and conveying operation of ultrafine powder at a time, and its technical parameters, mechanical properties and finished product quality were identified as "international advanced level" by China Machinery Industry Federation.

The LUM Ultrafine Vertical Grinding Mill has been widely used in regrinding and fine grinding operations of non-ferrous metals, ferrous metals and non-metallic minerals.

Vertical Roller Mill,Grinding Mill

Analysis of the reasons for Vertical Roller Mill slagging

Equipment Cause

Outlet ring wear and spout ring cover damage, into the grinding inspection found that the nozzle ring has been worn off about one-third, which makes the wind speed in the Vertical Roller Mill can not reach the design wind speed, can not lift the material in time, resulting in slag.

The grinding disc ring of the Vertical Roller Mill is badly worn, originally designed as a gap 8ram, and the clearance has been found to have reached 20 ~ 40mm after the post grinding inspection, and the air leakage is serious, resulting in slag spitting.

The guide cone wears badly and does not effectively serve as a guide for flow and airflow.

The wear of the roller and the lining plate of the Vertical Roller Mill is serious. The roll skin is initially 135mm, and the 30mm is the thinnest part. The millstone is initially 80 to 100mm, and only about 50ram left. The grinding pressure is reduced, the grinding effect is not good, and the circulating load increases, resulting in the slag discharge.

System Leaks And Insufficient Air Volume

Vertical Roller Mill three valve plate is not flexible, normally open or due to material moisture, after the valve plate removal system serious air leakage, much larger than 15% of the design allowable value, air leakage caused by slag.

Because of the material deposition, the inlet hot air pipe of the Vertical Roller Mill leads to less flow of air and less air volume, resulting in slag spitting.

Material cause

The granularity of the material is large. The normal requirements into the mushroom size less than 80mm, accounting for 5% of total material bulk material is allowed, but the actual production in grinding sometimes as high as 100 ~ 160mm, and the bulk material proportion is far larger than 5%, which will increase the grinding load cycle, caused by crushing the material layer in the instability caused by increased spit slag.

Material segregation. Due to the reason of the material itself and the time that the feeding time is not in time, the grinding block is too concentrated, which makes the cycle load increase and cause the slag spitting.

The material is poor in attrition. The original design used marble, iron powder, clay three components, then changed into marble, iron ore, fly ash proportioning. Due to the increase of the material's hard grinding composition, the cyclic load of the Vertical Roller Mill is increased, resulting in slag spitting.

The effect of fly ash. Fly ash ingredients, fly ash water due to the rainy season, up to 20%, without drying in the yard with limestone homogenizing ingredients, Vertical Roller Mill operation, fly ash bond in each feeding chute and into the mill three valve plate, hanging more more, to a certain extent suddenly collapse into grinding, crushing the load suddenly increases, spit slag increased sharply.

Vertical Roller Mill Slag Discharge Related Measures

Vertical Roller Mill Encyclopedia

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Factors affecting the productivity of Vertical Roller Mill

1. The structure of the Vertical Roller Mill.

The grinding roller, grinding disc device, inlet and outlet device, pressure device and transmission device of Vertical Roller Mill have great influence on the output of Vertical Roller Mill. Some improvement measures can achieve significant results.

2. Types and gradations of lapping bodies

The process of crushing the material by the Vertical Roller Mill is mainly realized through the movement of the grinding body. The rational selection and use of the abrasive is an important link in the energy saving and high yield of the cement Vertical Roller Mill.

3. High efficiency separator.

In closed circuit grinding system, separator is an important equipment for controlling material fineness, and also a main assistant for energy saving and high production. Its structure, performance and system composition are very important for the Vertical Roller Mill production process.

4. The ventilation effect of the Vertical Roller Mill

The internal water vapor and fine powder can be discharged from the Vertical Roller Mill to prevent adhesion and clogging, to reduce the grinding phenomenon in the Vertical Roller Mill, to reduce the temperature in the Vertical Roller Mill, to improve the grinding conditions and to improve the grinding efficiency and production.

5. Operation automation of Vertical Roller Mill

The modern high and new technologies such as rate control, batching online control, Vertical Roller Mill load automatic control and frequency conversion speed control have been mature. It is not only beneficial to the energy saving and high production of Vertical Roller Mill, but also conducive to the improvement of production management level.

In summary, there are 5 main factors affecting the Vertical Roller Mill. If we improve each of these factors, we will inevitably increase the output of the Vertical Roller Mill, save the cost of production, and create higher profits for the enterprise.

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Factors affecting the operation of Vertical Roller Mill

The mineral composition of raw materials determines the difficulty of grinding.

The mineral composition and crystalline form of raw materials determine the degree of difficulty and the grindability of grinding. It is also an important condition for grinding process parameters.

The proper thickness of the material layer can maintain high grinding efficiency and reduce the vibration of the Vertical Roller Mill.

The stabilization of the thickness of the material layer is the key to the operation of the Vertical Roller Mill. The material layer is thin, and the grinding efficiency is high, but it is easy to vibrate. The thickness of the material layer is small, but the grinding efficiency is low. The uneven material layer will cause the vibration to increase. Theoretically speaking, the thickness of the material layer should be 2% + 20mm of the roll diameter, for example, the diameter of the roller of the Vertical Roller Mill is 3000mm, the suitable material layer thickness is 60 + 20mm. The thickness of the material by the dam ring height, wind, feeding, water volume effect. The height of the retaining ring is generally determined according to the size and size distribution of the feed when installing. In operation, the precondition of adjusting the thickness of the material layer is to match the wind and feed quantity of the system, the OVERPULL will cause the material to walk in the Vertical Roller Mill, the material layer becomes thinner, the vibration becomes larger, the wind is too small, the material is not balanced, the material layer is thickened, the grinding efficiency is reduced, even the satiety is caused. The adjustment of water spray is to adjust the thickness of the material layer under the condition of the matching of the wind and feed, and the thinner thickness of the material layer can improve the grinding efficiency under the condition of the stability of the vibration.

The rate of feeding depends on the balance and stability of grinding condition.

The so-called grinding condition refers to the balance and stability of the grinding machine, that is, the Vertical Roller Mill is in a stable or unstable state of grinding, in which the internal pressure of the Vertical Roller Mill, the current of the main engine, the quantity of internal and external circulation, the vibration and the material layer are the main marks. The size of feed should be determined according to the grinding condition. When the grinding machine is more empty, 70% of the material can be pre added. After the pressure difference, the main current, the material layer and the Vertical Roller Mill vibration stable, with the increase of the grinding pressure and the system exhaust air, if the Vertical Roller Mill has the rich grinding ability, it can be properly added. In operation, it is required to make the Vertical Roller Mill gradually transform from a series of low end grinding balance to a high level grinding and leveling transition, and minimize fluctuations in the transition. When the Vertical Roller Mill is added to the rated capacity, it should run steadily for a period of time so that the Vertical Roller Mill can reach the stable state of the balance of material import and export, the balance of breakage, and the balance of the wind and material. At this time, it is possible to choose whether or not to increase production. We know that any equilibrium is elastic. Under this balance, proper addition and subtraction of material has little effect on the grinding condition.

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Vertical Roller Mill VS traditional mill

At present, the domestic use of milling equipment is mainly pendulum Raymond mill, roller, rod mill, etc. Among them, pendulum Raymond machine and rod mill are more commonly used. However, these traditional milling equipments have the disadvantages of high production cost, small production capacity and serious pollution. As a result, a Vertical Roller Mill with low production cost, large production capacity and less pollution emerged. It has been widely used in mineral processing in different industries, and the effect is very obvious.

1, the production of environmentally friendly conditions. The entire milling process of the Vertical Roller Mill is carried out in a confined space. It differs from traditional Raymond machines in that negative pressure vacuum production is used instead of positive pressure air supply, thus effectively eliminating the dust generated during the milling process.

2, reliable stability and efficient production performance. The Vertical Roller Mill is currently mainly used in the processing of coal, calcium carbonate and other minerals in China, and the production process is mature. In the production process, the failure rate is low, the equipment operating rate can reach more than 98%, and the production efficiency is high.

3, low labor costs. The Vertical Roller Mill has a high production efficiency, a high degree of automation, and requires fewer operators; and the reliability is high, the stability is good, the general maintenance amount is small, and a lot of workers are not required to perform maintenance, so the labor cost is relatively low.

4, material consumption, low energy consumption. The Vertical Roller Mill powder machine has high reliability and good stability, which directly reduces the maintenance and repairs, thus directly reducing the cost of maintenance material costs. Under normal normal production conditions, the most direct maintenance material cost for the Vertical Roller Mill is the replacement and maintenance of wear parts such as grinding rollers and grinding discs. However, after the roller sleeve is worn to a certain extent, it can be used repeatedly for overturning to extend the life cycle of the sleeve.

Vertical Roller Mill News

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Vertical Roller Mill Raw Material System Operation

Open mill

The Vertical Roller Mill starts fast, generally from the auxiliary machine to the main engine running 3min time. The start of the auxiliary unit (including the top dust collector of the raw material homogenization library, the storehouse slope fan, the storehouse conveyor, the long inclined slot fan, the lubricating station of the Vertical Roller Mill reducer, the main motor and the circulating fan oil station, the hydraulic station, the rotor under the cyclone, the sealing blower, the rotary lower feeder, the circulating hoist, the pulverizing machine, the circulation fan and so on) need lmin.

After the start condition of the Vertical Roller Mill is satisfied, the auxiliary transmission motor is started, which reduces the load of the main motor when it starts. When the auxiliary motor is running, it needs to spray about 8m3 / h, and the grinding roller will grind the material on the millstone to the material pad to ensure the material layer after startup. The operation time of the auxiliary motor is 120s. This time can adjust the opening of each system valve, open the inlet and outlet valve of the circulating fan to 95%. At the same time, the short circuit valve of the dust collector of the tail bag of the kiln is closed to 0, and the circulation wind valve opens to 95%, so that the exhaust gas of the tail of the kiln is passed through the Vertical Roller Mill. After the valve is adjusted, the auxiliary motor still has the running time. Later, the operation time of the auxiliary motor is changed from 120s to the main motor after 90s, and the feeder station feeder and the grinding belt start at the same time. The grinding time is saved by 30s, and the Vertical Roller Mill is feeding according to the ideal stage to complete the high motion of the Vertical Roller Mill.

Air volume regulation

Before the Vertical Roller Mill starts, the inlet and outlet valves of the circulating fan are fully opened to ensure sufficient air volume to meet the start of the Vertical Roller Mill. The main reason to turn on the circulating air is to adjust the inlet and outlet air temperature and save energy. If the Vertical Roller Mill is running normally, if there is excess air volume, it can be discharged into the dust collector by adjusting the short circuit valve opening of the bag collector; if the air volume is insufficient, it can be added into the cold air (under the premise of ensuring the temperature of the grinding wind), adjust the opening of the valve outlet of the bag collector, ensure the inlet air pressure of the bag collector -650 to -800Pa, and ensure the match of the air volume of the kiln. The concentration of dust (finished product) in the grinding gas is 550 ~ 800m3 / h. The air pressure is about 900 Pa and the wind pressure is about 800 Pa, 90 m / S at the ring nozzle ring of the grinding wind speed, 20 m / S for the grinding wind speed, so as to avoid the horizontal arrangement of the grinding pipe to prevent the aggregate.

Feed Volume

The Vertical Roller Mill belongs to the material bed grinding, the grinding roll pressure is big, double extrusion, the pressure cylinder belongs to the single line tension type, the grinding roller can not be lifted, which requires continuous and stable feeding, and can not have metal and other foreign objects, otherwise the Vertical Roller Mill can not operate safely and efficiently.

Vertical Roller Mill Roller Bearing Failure

Contact Fatigue Failure

The formation process and the consequences are: pitting corrosion, pitting spalling - shallow spalling - deep spalling.

Wear Failure

The process of formation and its consequences are: wear-shape change - increase in fit clearance and work surface change - lubricant contamination - loss of lubrication function - loss of bearing rotation accuracy.

Fracture Failure

It is mainly influenced by two factors such as overload and defect. Overload fracture occurs when the load exceeds the limit of strength. The defects of the Vertical Roller Mill bearing parts, such as micro cracks, shrinkage holes, bubbles, large external impurities, overheated tissue and local burns, can also cause fracture at the defect of impact overload or severe vibration.

Change failure of bearing clearance

The interaction between the internal and external factors leads to the change of the fit clearance, resulting in the reduction of the bearing accuracy of the Vertical Roller Mill, resulting in the phenomenon of "bite to death". The external cause mainly refers to the excessive amount of interference, the lack of installation, the expansion of the temperature and the instantaneous overload, and the internal factors mainly include the residual austenite and the residual stress in the unstable state.

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Selection Of Vertical Roller Mill Manufacturers

The quality of the Vertical Roller Mill directly determines whether the production line can operate normally. Therefore, when selecting the Vertical Roller Mill equipment supplier, we must see whether it has spare parts supply and production capacity, so as to avoid the subsequent replacement of spare parts, maintenance of spare parts to bring all kinds of trouble, delay the normal production.

Vertical Roller Mill Quality Guaranteed

Modern factory buildings, sophisticated equipment, and advanced technology are the guarantees for the manufacture of high quality Vertical Roller Mills. We have a large-scale casting base in the same industry, with complete machinery processing equipment and excellent equipment. The main parts and gears of Vertical Roller Mills, such as grinding discs, grinding rollers, and rocker arms, and the main spare parts of ball Vertical Roller Mills such as hollow shafts from casting to finished products, and the auxiliary machines required in the entire production line of the production line, are all manufactured by the company and ensure the processing quality of the entire equipment. .

Shortening the supply period of the Vertical Roller Mill

The large processing equipment with strong strength ensures the production cycle of Vertical Roller Mill, and makes us have the advantage of specialization and mass production, and shorten the supply period of the Vertical Roller Mill on the premise of guaranteeing the quality of the product.

Vertical Roller Mill easy maintenance in the latter part
  

According to market surveys, some customers often encountered problems in the production of Vertical Roller Mills, such as postponement of responsibility for post-repair, no-one-door service, and replacement of spare parts, which caused a serious impact on production. We rely on a large casting base to provide complete sets of accessories for Vertical Roller Mill main and auxiliary machine processing and grinding equipment. This problem has been completely solved. The original host machine and original spare parts allow you to use more confidence and peace of mind.

 

 High performance Vertical Roller Mill is the basic guarantee for producing high quality products. Therefore, customers should conduct comprehensive inspections and consider in many aspects. Only by selecting a reliable Vertical Roller Mill manufacturer can the normal operation of the Vertical Roller Mill be guaranteed in the later period.

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