The unique crushing principle of the jet mill, there are many features in the structure and mode of operation. Known by the kinetic energy formula, in order to achieve the purpose of ultrafine grinding, the airflow of the air jet mill, must have a high speed in order to have the energy. Different pressure and temperature according to the selected type of gas, the gas entering the nozzle and nozzle type, the flow velocity from the nozzle for subsonic velocity and supersonic. The general air flow rate of 200-500 m / sec, and some even up to 800-1000 m / sec or higher. Known by the gas dynamics, to produce such a high flow velocity, the necessary condition before entering the nozzle, the gas should have a high initial pressure, and also to use the advanced cavity nozzles. The most commonly used gas hot water, steam and compressed air. Some inert gas such as nitrogen, carbon dioxide is also used, but they are mainly used for crushing of the heat-sensitive and inflammable and explosive materials. Strong hot water vapor pressure generally above 10 kg / cm, while the compressed air is more than 7 kg / cm.

Airflow with a huge momentum, and has crushed particles in the gas stream on their own according to the particle size grading, air jet mill products, fine particles and narrow particle size distribution, particle surface smooth, particle shape close to spherical, the purity of the product high activity, good dispersion and a series of characteristics. Airflow pulverization technology in modern processing industry occupies an important position, and its scope of application has been involved in many industrial sectors. It is mainly used in the finished particle size of less than 5 microns or less than 1 micron powder material. Allegedly, the air jet mill in a dry ultrafine grinding of pigments, pesticides, cosmetics and other materials, has an irreplaceable position. Due to the small jet mill, compact shape, no moving parts, it is widely used in the laboratory, one of the main grinding equipment for the laboratory preparation of various micronized or ultrafine body.

Shanghai Shibang Machinery Co., Ltd., founded in 1995, located in Shanghai Pudong New Area, with 90,000 square meters of modern production base, professional R & D institutions and technical team, with expertise in the mining crusher, sand making equipment and industrial milling equipment R & D, manufacturing and sales, and high-grade aggregate for highways, railways, utilities and other large-scale projects to provide solutions and equipment.

World state machine has a professional industrial production lines, SOLIDWORKS, 3D mechanical design and computer simulation test system, the introduction of the latest technical equipment and testing methods in Germany, Japan, the United States continue to strengthen the application of advanced technology and advanced standards. Through the ISO9001: 2000 international quality system certification and CE certification, strict product quality control, and continue to develop their own intellectual property rights, high-tech products with international advanced level. At present, the state machine in the world patented 13, a number of products "Shanghai Hi-tech achievement transformation project, production mining broken equipment and industrial milling machine series products are widely used in mining, construction, chemical, metallurgy, steel, etc. industry.

The situation of the global economy, the state machine of the world have formed the main series of products to the crusher, mill, vibrating screen, feeder and other ancillary equipment, supplemented by the complete product chain, and become the major sand and gravel, milling machinery production and export base. The main products include: mobile crusher station and tracked mobile crushing plant, of YGM Raymond Mill, MTM, trapezoid Mill, SCM ultrafine powder mill the MXB freestyle hem grinding and LM vertical milling machine, MTW European Trapezium Mill, the PFW European version of the counter-crusher, impact crusher, the European version of the JC jaw crusher (broken jaw), the PE jaw crusher (broken jaw), the PF counterattack crusher, 5X system sand (sand making machine), the VSI sand making new CS hydraulic cone crusher, HPC efficient cone crusher and other series products.

"Trend from the domestic first-class world-class manufacturing from China to Created in China" as the goal, the Shibang machine to adhere to international development strategy, according to market demand and product status, continue to strengthen the development efforts of the international market. At present, the company's export sales have accounted for more than 70 percent of total sales, exports to the United States, Canada, Australia, Russia, the Middle East, more than 130 countries and regions, and gradually establish a the Shibang brand in the international market force The popularity and reputation.

World state machines adhere to the professional, rigorous, integrity and pragmatic style of attitude in face of the market, the use of the rich heritage and high-tech, and continuously improve product performance and reliability, reduce maintenance costs, and strive to win-win situation with customers.

Calcite is a mineral of the most common natural calcium carbonate, calcium carbonate content is generally 93% -98%. It is generally the shape of the lens, a variety of crystal forms, which can be clusters of crystals, it may be granular, massive, fibrous, emulsion bell, earth, etc., due to tap into many pieces square block, hence the name calcite.

Calcite, Mohs hardness, low hardness, are easy to grind the ore. Calcite in the industry generally in the form of powder, namely calcite, which is common in industry, heavy calcium, often used as fillers, are widely used in artificial tiles, rubber, plastic, paper, paint ink, paint, cables, construction materials, food, pharmaceutical, textile, food, toothpaste and other chemical industry production households has significantly improved product performance, reduce production costs, and therefore subject to widespread concern for many manufacturers.

In the production of calcite to be transformed into calcite powder, milling machine and grinding rock of the necessary equipment. Requirements and general calcite plants for large refined mesh refinement are higher, and therefore the general use of the plant high pressure micro powder with calcite grinding treatment.

High pressure powder mill micro mill at medium speed, medium speed micro-milling, SBM development of national trends of milling and market demand, the introduction of learning technology advanced milling in Sweden, to develop and produce a new type of powder powderand superfine grinding and processing. Device uses continuous grinding the extension of both materials of a number of grinding cycle, the refined grain size is finer (which can be adjusted between 325-3250 mesh), the milling efficiency, consumption lower energy in the limestone calcite, chalk, calcium carbonate, dolomite, kaolin, bentonite, talc, mica, magnesite, illite, pyrophyllite, vermiculite, sepiolite, barite , gypsum, alunite, graphite, fluorite, phosphate, potassium ore pumice, etc. Mohs hardness below 6, milling and processing performance of materials non-flammable and explosive special by unanimous approval Business and industry transformation.

Rock crusher other traditional sex ratio of rock mill has the following advantages:

1, high efficiency, low energy consumption in the case of the same product smoothness and the engine power, jet mill rock crusher, mill production of mixture of 40 percent, while the consumption of system Energy is only one third of the jet mill.
2, the fineness of the fineness of the rock crusher can be adjusted to 325 mesh to 2500 mesh, the fineness of a time up to D97 ≤ 5 microns.
3, safety and reliability of the bearings grinding cavity, screws, so there is the issue of vulnerability of bearings and seals, there are no screw loosening and destruction of the problem of the machine.
4, the use of clean water, green, pulse dust collector and the silencer to reduce the dust pollution.

The selection process is divided into hierarchical and through the screen into two phases, laminating material is derived from material selection through the sieve is the purpose of screening. Material role in the screen surface by forces outside the screen area in a loose state, so that each material can be obtained from the mutual displacement of particles the energy and space to the property softness in the ordering process is efficient sieve. The granularity a large number of different thickness of the bulk material mixed in the screen surface only a portion of the particles and the screen surface in direct contact, in contact with the surface of the screen in this part of the material, not all smaller than the end the screen, smaller than the mesh of fine material, distributed to all parts of the material layer, but the fact of the matter relative movement and the screen surface, the surface layer of the screen material is free of particles already exist between the growth of particles porefurther small particles to pass through the pores of the lower deck, large particles can not pass through the small pores between small particles , the high position of the particles increases in the movement.

Thus, the arrangement order swarm home after a long period of analysis stratified by size of particles, the formation of large grains of the pellets in the other, on a more regular arrangement.

In this way, less than the fine sieve through the screen, the thickness of the separation of the particles is completed specific selection process (separation of the particle size and the size of sieve compatible with the selection process). The so-called "screen accurate" is not all smaller than the sieve great product become a sieve through the sieve. Fines through the sieve, the particles are smaller than the screen, but the relief through the sieve.

Practice has proved that the smallest particles through the sieve in the sieve, the more likely. And particles such as the size of the sieve, the particle size is equal to three quarters of particles of sieve size, called "easy to sieve particles can be filtered. The particle size of less than sieve, but more than three quarters of particles larger perforated, known as hard-grained sieve. Difficult Grain sieve "diameter close to the screen size, the more difficult its transparent screen. This can also be of F. Materials theory proposed by Mogensen (Mogensen) through the sieve formula of probability (households) to illustrate this. Households with two (a - d2) 2 (1 No.): (> 1) in the mouth - the size of the sieve - the particle size. We can see from the formula (1-1): from. Value, overtime, equipment theories across the screen the greater probability values ​​of convex and close to the material through the theory of probability of detection is almost close to zero, it is difficult to transmit a sieve. Therefore, the traditional "Screening Screening and accurate preparation of a surface of the screen long (like 7-9m) to achieve greater effectiveness of screening. For thin wet material (like coal) is almost impossible. Therefore, the traditional "screening precise" fine sieve (6 mm below the rank of screening particles) or wet materials are often clogged sieve, seriously affecting the production process of screening, even with a mesh screen different not solve the problem.

Application of vibratory Crusher · 99. Vibration cone broken machine (inertia cone broken machine) along material most weak surface within layer broken, broken than maximum can up 30, in 4-30 of range within adjustment by needed broken than simple, and reduced had crush, unloading material clearance increases Shi (as liner wear caused), does not increases broken products of average grain of, can with load started and parking, dang cannot is broken of foreign body into people broken cavity Shi, does not caused drive device overload or damage, reduced broken segment number, simplified process, reduced secondary device number, Without quantitative feeding device to the crusher feeding, without heavy Foundation building, 20% per cent to reduce construction investment. Vibrating cone Crusher (inertia cone Crusher) is widely used in the following situations.

Vibrating cone Crusher (inertia cone Crusher)-standard, medium and fine crushing cone crusher is the same usage and General eccentric drive, here are notes vibrating cone Crusher (inertia cone Crusher) usage of Super fine crushing.

Living hinge at one end of the counterattack, hung in the chassis, suspension bolts to position it on the other end. When large materials or scrap material sandwiched between counterattack plate and rotor, counterattack under greater pressure to back away, clamp the material through to avoid rotor damage. After the passage of materials, fight back by repeated-. Increasing the number of crushing cavity (that is, increase the number of counterattack plate to increase the interval) can enhance the selectivity crushing, increases the reduction ratio of the material.

Thus increasing the crushing Chamber after the lower rotor rotating speed can be taken, too large in size can be reduced, reduced hammer wear. Three counterattack crushing cavity consisting of three structures, low energy consumption, high production capacity and 400 large blocks of rn/Tt can be broken to the 0~35 rnlTl. Production capacity 30~240 t,/h. Body double rotor of inversed impact crusher, contains two parallel alignment of the rotor, two rotors and have some height difference. First level higher rotor position, and second-stage rotor two rotor center line-line horizontal angle of about 12 degrees. First level for heavy rotors, coarse; second-level rotor speed is more faster, to meet the requirements of the final product. Primary and secondary rotor is bolted solid with distributed into 6 rows of 12 Silver Hammer. Flat hammer high manganese steel casting. Fixed-mounted on the major axis of the rotor, bearing supported at both ends in the body, each of the two rotors are connected by two electric motors hydraulic coupling, the V-belt transmission, with high speed rotating in the direction.

Hydraulic coupling can reduce the starting load, reduced motor capacity can also play a protective role. First counterattack plate and a second counterattack cavity back plate is hinged at one end while the other end adjusting bolt. Flat hammer parts wear causing gaps after more or because products such as particle size to be adjusted at the request of gap, is by adjusting the adjusting bolt to adjust the clearance between counterattack plate and plate hammer. In order to take full advantage of kinetic energy of materials when discharged, eliminating individual discharge of bulk material, ensure the quality of product size, discharging end of the rotor at the second level are the whole grate plate and back panel. All of grate plate and counterattack plate of high manganese steel manufacturing.

Concentrator generally coarse broken, broken into three sections of broken and fine grinding of iron ore crushing process. Rough or broken 1.2m 1.5m multi-cycle crusher, breaking with 2.1 m or 2.2 m standard cone crusher, fine break by 2.1 m or 2.2 m cone crusher short head type . Through the broken ore thickness, the block is not greater than 1 m, and then through the medium and fine crushing and screening in the small particle size of 12mm ore to send the final product in the grinding gap. In the process of crushing iron ore, a majority of two-stage grinding process, a small processing plant to use more grinding process. As a result of fine grinding and then screening of new technologies in recent years, has two hub grinding into three sections. The grinding equipment used in general is relatively low.

SBM Group offers enrichment plants iron ore for the concentration process to qualify for the fraction of fine iron ore - 1.2 mm to 0.075 micron. We have provided engineering services for design of process plant and equipment for materials handling.

Grinding function working properly, the granular material must be ground evenly, preventing one of the particles accumulate (called rock or stubborn). In this regard, mill liner design, speed, to the material particle size, material of the cylinder filling rate and needs reasonable select and co-ordinate. Nature of some materials are not suitable for grinding, others require a small amount of material composed of large steel ball to adjust its size to avoid accumulation of persistent block.

Autogenous technology according to size of material can be divided into-, since the two kinds of grinding and fine grinding. A mill is to mines containing a variety of particle size of raw material (sometimes through a coarse) direct person for a mill (the mill), the maximum granularity of ≥ 300-400, grinding products in 14 mesh size (1, 17 mm). Fine grinding is a coarse, medium and fine crushing operation, or coarse, medium and fine crushing and preliminary ground work of fine material (grain size 13 mm), into fine grain mills for fine grinding, grinding grain size up to 95% less than 400 mesh (0. 037.). Fine grain mill and pebble mill, the media is taken from the section of broken ore with medium-granularity.

Grinding technology by adding a small amount from the mushroom ball into full and semi-autogenous grinding mill. Without steel ball mill, adding a small amount of steel balls (up to volume of cylinder 1. 5-2, 5) is a semi-autogenous grinding, also by joining in the feeding of water, by autogenous grinding technique is divided into thousands of grinding and wet grinding. Since the mill to size up to 300~400 mm of feeding ground directly to the very fine particle size, such as grinding to 0. 1 mm below the crushing ratio is up to 3000-4000, thus saving the medium and fine crushing and rough grinding machines, process simplified, less consumption of steel, grinding without iron contamination, dissociation is better and so on.

Has been mentioned before, since the diameter of the grinding machine is actually very large mills can be long or short in length, with the ball on the working principle and structure are similar, but differ:
(1) in a ball mill, ' ball loads with the cylinders rotate and rise · and then purging falling or thrown off, ball-bearing basic; seven non-axial movement. While in hiding, role of bulk materials played a steel ball on the one hand, have an impact on smaller items, and abrasive, but the bulk material itself was ground. Than the wind, whether it is large or fine material, there is a flow from end to end of the axial movement. But high axial velocity of fine particles, large axial velocity is low, if measures are not taken, then near the end, the big accumulated more and Yu at the discharge end of the large enough, small grain accumulation. Small not crushing each other, only to wear each other. This situation and inadequate feed grinding abrasion mill similar to each other. This is negative to ground.
(2) due to the material density is much lower than that of steel ball, a difference of more than 1 time, under the same filling rate, you must increase the diameter of cylinder, have a sufficient impact and abrasive materials, grinding materials.
(3) in the radial direction of simplified, distributions generally are large blocks of material is more concentrated in the inner layer, of medium-size village in the middle-tier, fine is more focused on the outer layer.

Direct-and-bunker of coal pulverizing system in comparison, each has different advantages and disadvantages. Advantages of direct-fired systems are: the system is simple, easy, controlling sensitive, compact layout, less consumption of steel products, covering small, low investment, pipe conveying a short, small flow resistance, and low power consumption rate of coal pulverizing system. However, in General direct blowing pulverizing system operation reliability, because the exception of flour milling equipment direct effects on the normal operation of the boiler unit; and since the mills contribute to changes depending on the boiler load, if a single output of coal mill or improper number matches the boiler capacity, to ensure coal pulverizing systems often run as the most economical conditions. Often an existing boiler direct-fired system running on a cause of economic indicators failed to meet the required.

Bunker coal pulverizing system with high reliability, as it can from the adjacent coal pulverizing system and, if necessary, can also be by the neighbouring coal pulverizing system of boiler, by reversing the spiral conveyor to supply coal. When you need to change the coal on boiler, can be adjusted in powder feeding machine. Therefore, mills can be run under the current economic conditions, pulverized coal fineness can remain unchanged. Silo-fired systems are complex, operate more, consume large amount of steel, high investment, covers, powder feed pipe long, flow resistance, and high power consumption rate of coal pulverizing system. In addition, for High Volatile coal, coal powder explosion risks are large. Especially pulverized coal bunker, fine pulverized coal separator import segment, more explosive.

Direct-fired system,-speed coal mill and high-speed grinding machines, in recent years the few also uses the direct blowing pulverizing system of ball mill in power plant.

-Open cartridge usually uses the ball mill coal pulverizing systems, but there are also middle-speed Coal mill silo-type milling system. Selection should be based on fuel types, grinding of coal pulverizing system type, boiler coal type, capacity and total load. Determined by technical and economic comparison. But should take into account the milling system should guarantee reliable operation of boiler units, and--in economics.

Description, really I, direct-fired system and silo systems, not only running the economics of higher, and as long as sufficient reserve capacity in the same silo system operational reliability level can be achieved. In contrast, in large boiler units silo-style system of compound is relatively prominent, to the reliable operation of coal pulverizing system adversely. Therefore, in large boiler units BU, the superiority of direct-fired system more clearly displayed.

2, toothed-roll crusher for clay. The crusher can only be crushed sand, clays are badly clogged and bonding, not iron protected devices, and serious worn inside the machine.

3, quick clay Crusher. The crusher can only be broken water 15% of clay; size coarse; wear more serious.

4, frozen crushing machine. The crusher impact crusher crushing mechanism, the traditional fixed back panel to swivel back plate, main design idea is to avoid the viscous material bonded on the counterattack. But for water more than 20% of clay, plastic index greater than 17, which is difficult to solve bonding problems. Main features are broken blocks of frozen soil, broken than large, active counterattack campaign frequency range from 28-383r/rain, maximum amplitude of 14ram. Frozen Crusher sight.

5, CJ series impact crusher for clay. This device also uses the crushing mechanism of inversed impact crusher, but the counterattack to counterattack crushing roller, adhesive material on the glue roller scraper relies on clean, the crusher permafrost has certain effects, but is not ideal for soft clay using. Due to the flexible deformation energy absorbed, crushing efficiency greatly reduced. Also increase the likelihood of clay in the machine wall adhesive on both sides.

6, old double teeth roll Crusher. The broken device due to broken structure old, tooth roll surface processing rough, tooth roll speed lower, material broken Hou difficult to rejection away from roll body, in broken high water, and high plastic clay Shi, tooth roll often "paste died", formed two a "mud roll", device itself no cleaning device, tooth roll teeth between of clay bond real constantly was squeeze, firmly stick in tooth roll Shang is difficult to cleanup off, old double tooth roll broken machine.

7, double-toothed roll crusher, applied to southern rainy regions of broken clay. Characterized by processing.