Also known as vertical roller mill grinding, medium grinding, since the invention has been half a century, with the materials science, development and design of hydraulic technology, the innovation process, so that the body's resistance to vertical grinding mill have been significantly improved and enhanced, more advanced and reliable hydraulic system. Roller roller and disc structure lining the continuous improvement of disc rotation speed corresponding to the grinding fineness of different products to further improve efficiency, so that the development and application of vertical mill to be further expanded.
In the modern cement industry's production system, including raw material grinding mill operations, cement grinding, grinding and preparation of coal slag. Cement grinding unit is generally believed that the power consumption of the consolidated materials, power consumption of 60% to 70%, therefore, improve efficiency, reduce power consumption has been grinding the cement industry grinding technology research priorities. LM Series Vertical roller mill (roller mill) is an energy efficient drying and grinding equipment, set crushing, drying, grinding, classifying, transportation as a whole, the use of limited vertical roller mill powder bed material grinding principle, with a grinding, high efficiency, low power consumption, drying capacity, easy to adjust the fineness of the product, the process is simple, small footprint, low noise, no dust pollution, low wear, easy maintenance and reliable operation .
Vertical mill gear from the main motor, coupling, reducer of three parts, mounted on the lower part of the mill, it is necessary to drive disc drive, but also bear the disc, material, weight and pressure roller device applied grind grinding pressure, the vertical mill is one of the most important parts.
In order to adapt to the user more goods of low quality coal grinding anthracite trend, HRM vertical coal mill increase to the main gear speed reduction ratio of measures to reduce the disc, while improving the roller and roller disc liner structure, the disc to form a stable material layer thereby increasing the grinding pressure roller, to improve grinding efficiency, reduce the possibility of vibration mill, producing a more stable and reliable.
Vertical roller mill is an important component of grinding, HRM vertical coal mill liner and the use of arc-shaped tire roller, roller symmetrical structure, to a certain extent can be worn upside down to use, extending its life. Roller bearing using the new mechanical seals, both to improve sealing reliability, but also because fans do not need to seal reduces the oxygen content of the mill, reducing the possibility of an explosion inside the mill.
General vertical mill roller bearings with grease lubrication, but because of the larger coal moisture, the ability to improve drying, grinding chamber gas temperature is as high as 100 degrees, could easily lead to improper operation roller bearing temperature is too high, causing grease Evaporation metamorphism affect bearing life. Thus, HRM has been adopted coal grinding roller mill vertical thin oil lubrication, cooling, greatly increasing the bearing life (generally more than 2.5 times increase).
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Impact crusher product size distribution of the main factors affecting the size distribution of feed, spindle speed and feed rate. In the feed size distribution to determine the circumstances, the basic parameters are the major products with the spindle speed and feed rate of change, therefore, necessary to affect the product particle size distribution analysis of the factors to identify the most important influence factors, the actual production provide the basis for operational control.
Orthogonal experimental design in scientific research and actual production has practical value of an experimental design approach, typically used for multi-factor experimental conditions of study, based on the number of experimental factors and the level of each factor the number, select the appropriate orthogonal to arrange experiments, the use of mathematical statistics approach to data, you can easily find too many factors for the experimental index has a significant influence of the main factors to determine the optimal experimental factor level indicators. Therefore, this article first orthogonal experimental method to determine the impact of particle size distribution of the main factors in order to facilitate the practical operation of the control.http://www.grinderpro.com/Impact.html Crushing Stone Equipement:http://www.infostonecrusher.com

 

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Aggregate classification
According to the kinds of stones, the aggregate can be classified into many kinds, such as basalt aggregate, granite aggregate, limestone aggregate, river stone aggregate, cobble stone aggregate, sand stone aggregate and slate aggregate etc.
According the aggregate heavy degrees, the aggregate can be classified into coarse aggregate and fine aggregate.
Fine aggregate: the grain size is below 4.75 mm, also called sand. According to the source, there are natural sand and artificial sand. The natural sand is the rock particles whose grain size is below 4.75 mm, formed by natural weathering, potamic transport, separation and stockpiling. The artificial sand is the general terms of mechanism sand and mixing sand that go through the soil removing .
Coarse aggregate: the grain size is above 4.75 mm, also called rock. The common coarse aggregate are gravel and pebble. The gravel is the rock particles whose grain size is above 4.75 mm, formed by the natural rock or river stone crushing and sieving.
Aggregate product line equipment
The aggregate production equipments mainly consists of efficient crushers, such as Jaw Crusher, Impact Crusher and cone crusher. There are other auxiliary equipments, such as storage bin, vibrating screen, feeding machine and belt conveyor.
Some aggregates need auxiliary process, including washing, swirling sand washing machine and rotary screen. The main purpose is to make the final products more clearer. Thick powder separator and dust-cleaning apparatus can be equipped if using dry production process.
Aggregate production processing
Material taking: through blasting, the qualified rocks are fractured into pieces for crushing.
Conveying: after blasting, the stones are transported to the broken factory by tip lorry or belt conveyor. Or the conveying is the internal materials input process in each links.
Crushing: Using all kinds of crushers or rod mill or Ball Mill to crush the materials so that the materials will be smaller to meet various specifications demands.Crushing is the most important link in aggregate production process and is also where the aggregate production equipment fully plays its role. In addition to various types of crusher and auxiliary equipments, the VSI5X new sand machine researched by SBM Machinery is the necessary machine for producing the quality sands.
Screening: Sorting in the production process. Through various specifications of vibrating screen, the qualified materials are selected out then transported to the corresponding materials heaps. The unqualified materials are sent to crushers for next crushing.
Drying: Drying the aggregates which size and shape are qualified, in order to make the moisture content reach to relevant requirements. Generally speaking, the coarse aggregate needs natural drying. The fine aggregate(coarse sand and fine sand) needs dryer equipments.
Storage: The produced aggregates, which meet all kinds of specification requirements, are stored separately. For the different requirements for containing moisture and operating and environment condition, the open storage can be used and the storage bin or vertical shaft can be used for storage.
In the six working procedures, conveying, crushing and screening often are repeated. The processing flow can be summarized as screening repeated, crushing repeatedly and directional conveying.
Aggregate is granular loose materials whose total volume is the 60% ~ 80% of concrete volume. As the main raw material of concrete, the aggregate plays a role as skeleton or support in the concrete.The aggregate plays an important role in building. When mixing the materials with water, the cement will be thin paste after mixing. If the aggregat is not added, the cement will not be able to shape and not available. So we can say that the aggregate is very important.

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