CN202137013U - Closed-circuit final grinding device - Google Patents

Abstract

The utility model relates to a closed-circuit final grinding device which belongs to a grinding device and integrates grinding and classifying equipment into a whole. The closed-circuit final grinding device comprises a vertical mill, a powder concentrator and a blower, wherein the upper part of the vertical mill is connected with the powder concentrator, a fine powder collector is arranged at the periphery of the powder concentrator, an air outlet of the blower is connected with the bottom end of the vertical mill, and an air return pipeline is connected with the top of the powder concentrator. The closed-circuit final grinding device adopts the grinding technology by a rolling material bed, a rolling mill and a dynamic classifier are organically combined to form a self-classification internal-circulation single-machine grinding device, the powder classification is realized in the device, a traditional rotating grinding disc and a traditional driven grinding roll of the vertical mill are changed to a fixed grinding disc and a rolling grinding roll, and the powder classification is realized in the device, so that the working efficiency is high, the fine grinding performance is good, the abrasion is small, the energy consumption is low, the investment is low and the maintenance is safe and simple.

Description

A kind of closed circuit end milling equipment

Technical field

The utility model relates to a kind of milling equipment, particularly a kind of closed circuit end milling equipment.

Background technology

Since China's reform and opening-up, national economy increases fast, and " scientific and technical innovation, autonomous innovation " become the main flow of current industrial development, and China's industry progressively develops to the direction of intensive style, energy-saving and emission-reduction, low-carbon (LC).China is manufacture of cement big country, also is cement consumption big country, reduces the mistake high energy consumption in the cement pulverizing course energetically, and is significant to China's energy-saving and emission-reduction.Add up according to interrelated data; Cement in China factory 1 ton of cement of every production needs the material of grinding more than 30 kinds; And grinding pow consumption accounts for 65%～70% of the total power consumption of manufacture of cement, and the grinding cost accounts for about 35% of total production cost, and the grinding system maintenance capacity accounts for 60% of full plant maintenance capacity.Therefore, grinding is very big to the benefit influence of cement production enterprise, and the energy-saving and emission-reduction task is arduous.Along with implementing of strategy of sustainable development policy; In order further to reduce the manufacture of cement cost, cement industry just in primary study energy savings how, reduces and pollutes; In manufacture of cement, cut down the consumption of energy good, the profitable on ecology high grade cement of exploitation environmental benefit greatly.2009 Chinese cements industry grinding technology summit forum is in Held in Nanjing, and Session Topic is " maximization of production increases with quality up and cost of production down, low cost and benefit " that realizes cement in China grinding technology and technology.Ball mill is that cement powder prepares the most frequently used material grinding equipment, and it is big, firm in structure to have a comminution ratio; Advantages such as single machine yield height and air-tightness are good; But it also has energy utilization efficiency low (generally only reaching 2-3%), and noise is big, the heavy and more high shortcoming of steel consumption of volume.Roll squeezer also is a cement grinding preparatory milling equipment commonly used, roll squeezer technology comparative maturity, and energy-saving effect is apparent in view, and equipment price is also than higher.But roll squeezer to go out machine material particles pattern bad; Influence concrete operability, must all go into abrasive dust mill so roll squeezer goes out the machine material, the material of having reached article requirement goes into to grind once more grinding not only influences mill output; Also cause grinding easily, influenced the clinker strength performance.Over more than 100 year, people have done a large amount of research to the production technology and the mechanical kinetics characteristic of grinding machine, though obtained some progress and achievement, in practice, still have the technical barrier that does not overcome as yet.

Summary of the invention

The purpose of the utility model is to overcome above deficiency; A kind of closed circuit end milling equipment is provided; Employing rolls material bed grinding technology; To roll mill and become circulation unit milling equipment in classification with dynamic classification machine organic assembling, at device interior realization particle classifying, high efficiency, performance in small, broken bits is good, abrasion are little, energy consumption is low, reduced investment, maintenance are simple and safe.

The utility model solves the technical scheme that its technical problem adopted: be made up of Vertical Mill, powder concentrator, blower fan; Vertical Mill top is connected with powder concentrator; Establish fine powder collector around the powder concentrator; Fan outlet is connected with the Vertical Mill bottom, and return air duct is connected with the powder concentrator top, and Vertical Mill contains main drive motor, main gear reducer, wear-resisting mill, high pressure vane, high pressure grinding rolls; Powder concentrator contains lock feeding device, powder-separating area, charging aperture, reductor, drive motors, wind blade, meal collection cone, separating chamber, fine powder collector, air valve, product outlet; Blower fan contains high pressure positive blower, blower motor, return air duct, and the high pressure positive blower air inlet is located at the separating chamber bottom, and main drive motor is connected with the main gear reducer main shaft, and main gear reducer is located at the inboard bottom of separating chamber; And be connected with vertical drive shaft, connecing high pressure grinding rolls on the vertical drive shaft, high pressure grinding rolls is located on the wear-resisting mill, is provided with the high pressure vane around the wear-resisting mill; The separating chamber outside is provided with charging aperture, and the charging aperture place is provided with the lock feeding device, and separating chamber top is powder-separating area; Be provided with wind blade around the powder-separating area, separating chamber's top middle portion is provided with drive motors, and drive motors is connected with the reductor main shaft; The separating chamber outside is uniformly distributed with four cyclone separators, and cyclone separator top is connected with separating chamber top, and the cyclone separator bottom is provided with fine powder collector; The fine powder collector lower end is provided with air valve, and the air valve lower end is product outlet, and the powder-separating area below is provided with the meal collection cone; The meal collection cone is connected with material blanking tube, and the material blanking tube outlet is located at the Vertical Mill top middle portion, and high pressure positive blower is connected with blower motor; The air inlet of high pressure positive blower is located at the separating chamber bottom, and return air duct one end is connected with the high pressure positive blower interface, and the other end is connected with the cyclone separator top respectively.

The know-why that this equipment adopts is: the material for preparing with feed proportioning system passes through charging aperture; Through lock feeding device feeding separating chamber, drop on mill central authorities through logical powder pipeline again, under the effect of distribution device; Material moves to wear-resisting mill edge, receives high pressure grinding rolls in the abrasive dust district and mills; Material after the pulverizing is blown afloat by the high velocity air that high pressure positive blower produces at the mill edge, and oarse-grained meal falls back on the mill grinding again, and most of powder is brought to powder concentrator by air-flow; Carry out coarse and fine separation through powder-separating area, dust-contained airflow is under the effect of plane eddy current, and meal receives action of centrifugal force; Collide to the wind blade wall; Slide along wall after losing kinetic energy, fall into the meal collection cone, fall on the mill grinding again through material blanking tube; " fine powder " that sub-elects gets in the cyclone separator that is uniformly distributed with all around with air-flow, is slipped in the fine powder collector subsequently to be collected, and clean gas flow gets into the high pressure positive blower circulation, gets into once more and mills.

The utility model beneficial effect is: hold concurrently grinding and classifying equipoment of closed circuit whole grinding process equipment is one, realizes particle classifying at device interior.Employing rolls a material bed grinding technology, with traditional Vertical Mill mill rotate, grinding roller is driven changes that mill is motionless, grinding roller rolls into, reduces to drive hard, good rigidly reduces improper vibrations; On the grinding roller that rolls, pressurize and roll, make grinding pressure than traditional raising 3-4 doubly, mill efficiency is high, and performance in small, broken bits is good; On-load pressure is at the inner autodigestion of Vertical Mill, and the basis requires low, and civil engineering input cost is little; Vertical Mill and eddy current powder concentrator are combined into from the classification internal circulation system, reasonable distribution, and the cement granules circle coefficient is high, improves each age strength of cement, and high efficiency is safeguarded simple.The indoor uniform distribution device that is provided with of grinding can form uniform and stable material bed on mill.

Description of drawings

Be to combine accompanying drawing and embodiment that the utility model is further described below:

It among the figure a kind of closed circuit end milling equipment structural representation;

In the drawings: 1 main drive motor, 2 main gear reducers, 3 wear-resisting mills, 4 high pressure vanes, 5 high pressure grinding rolls, 6 lock feeding devices, 7 powder-separating areas, 8 charging apertures, 9 reductors, 10 drive motors, 11 wind blades, 12 meal collection cones, 13 separating chamber, 14 fine powder collectors, 15 air valves, 16 return air ducts, 17 product outlets, 18 high pressure positive blowers, 19 blower motors.

The specific embodiment

In the drawings, high pressure positive blower 18 air inlets are located at separating chamber 13 bottoms, and main drive motor 1 is connected with main gear reducer 2 main shafts; Main gear reducer 2 is located at separating chamber 13 inboard bottoms, and is connected with vertical drive shaft, connects high pressure grinding rolls 5 on the vertical drive shaft; High pressure grinding rolls 5 is located on the wear-resisting mill 3, is provided with high pressure vane 4 around the wear-resisting mill 3, and separating chamber 13 outsides are provided with charging aperture 8; Charging aperture 8 places are provided with lock feeding device 6, and separating chamber 13 tops are powder-separating area 7, are provided with wind blade 11 around the powder-separating area 7; Separating chamber's 13 top middle portion are provided with drive motors 10, and drive motors 10 is connected with reductor 9 main shafts, and separating chamber 13 outsides are uniformly distributed with four cyclone separators; Cyclone separator top is connected with separating chamber 13 tops, and the cyclone separator bottom is provided with fine powder collector 14, and fine powder collector 14 lower ends are provided with air valve 15; Air valve 15 lower ends are product outlet 17, and powder-separating area 7 belows are provided with meal collection cone 12, and meal collection cone 12 is connected with material blanking tube; The material blanking tube outlet is located at the Vertical Mill top middle portion, and high pressure positive blower 18 is connected with blower motor 19, and the air inlet of high pressure positive blower 18 is located at separating chamber 13 bottoms; Return air duct 16 1 ends are connected with high pressure positive blower 18, and the other end is connected with the cyclone separator top respectively.

Material process charging aperture 8 with feed proportioning system prepares through lock feeding device 6 feeding separating chamber 13, drops on mill central authorities through logical powder pipeline again, and under the effect of distribution device, material moves to wear-resisting mill 3 edges, receives high pressure grinding rolls 5 in the abrasive dust district and mills; Material after the pulverizing is blown afloat by the high velocity air that high pressure positive blower 18 produces at the mill edge, and oarse-grained meal falls back on the mill grinding again, and most of powder is brought to powder concentrator by air-flow; Carry out coarse and fine separation through powder-separating area 7, dust-contained airflow is under the effect of plane eddy current, and meal receives action of centrifugal force; Collide to wind blade 11 walls; Slide along wall after losing kinetic energy, fall into meal collection cone 12, fall on the mill grinding again through material blanking tube; " fine powder " that sub-elects gets in the cyclone separator that is uniformly distributed with all around with air-flow, is slipped to subsequently in the fine powder collector 14 to be collected, and clean gas flow gets into high pressure positive blower 18 circulations, gets into once more and mills.

Hold concurrently grinding and classifying equipoment of closed circuit whole grinding process equipment is one; To roll mill and become circulation unit milling equipment in classification with dynamic classification machine organic assembling; Rolling grinding tool has the advantage of vertical mill and roll squeezer to overcome its defective simultaneously again; Improve capacity usage ratio, reduced the loss of iron and steel in the grinding process.It adopts and forms a closed continuous circulation grinding system between classifying equipoment and the grinding machine; This technology puts on the pressure on the pressure roller to the grinding pressure of material from the deadweight and the spring of pressure roller; As long as pressure roller is applied to the intensity of the stress of material greater than material; Just can or crack, promote the energy that abrasive body consumed when ball mill is worked thereby saved the material crushing; The structure that rolls mill has the selection grading to the material of different-grain diameter; And can drag plus-pressure continuously; There is Continuous Tracking to pulverize effect to individual particle, improved crush efficiency, can realize that thin layer rolls simultaneously; Do not have the rely material bed effect of work of roll squeezer, saved the energy loss that factors such as material bed precommpression cause; Can in grinding machine, the automatic self-loopa of repeated multiple times roll, more much higher than the operating efficiency of roll squeezer, and roll linear velocity doubly than the fast 2-3 of roll squeezer; Closed circuit whole grinding since repeatedly circulation roll the total operating pressure that has reduced pressure roller, and the mechanism pulverized of material bed make pressure roller pressure all act on material bed on, avoided pressure roller to contact, thereby reduced the loss of iron and steel with the direct of mill.

The utility model can also have other embodiments, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of the utility model requirement protection.

Claims (1)

1. A closed-circuit final grinding equipment consisting of a vertical mill, a powder classifier and a fan, characterized in that: the upper part of the vertical mill is connected to the powder classifier, fine powder collectors are arranged around the powder classifier, and the air outlet of the fan is connected to the bottom of the vertical mill end, the return air duct is connected to the top of the powder selection machine, the air inlet of the high-pressure fan is set at the bottom of the powder selection room, the main drive motor is connected with the main shaft of the main reducer, and the main reducer is located at the bottom of the inside of the powder selection room, and is connected to the vertical The transmission shafts are connected, and the vertical transmission shaft is connected with a high-pressure grinding roller. The high-pressure grinding roller is set on a wear-resistant grinding disc, and a high-pressure air ring is arranged around the wear-resistant grinding disc. There is an air-lock feeder, the upper part of the powder selection room is the powder selection area, the powder selection area is surrounded by air guide vanes, the top middle of the powder selection room is equipped with a drive motor, the drive motor is connected to the main shaft of the reducer, and the outside of the powder selection room is There are four cyclone separators, the upper part of the cyclone separator is connected with the upper part of the powder selection chamber, the bottom of the cyclone separator is equipped with a fine powder collector, the lower end of the fine powder collector is equipped with an air lock valve, and the lower end of the air lock valve is the finished product outlet , there is a coarse powder collection cone under the powder selection area, the coarse powder collection cone is connected with a drop pipe, the outlet of the drop pipe is set in the middle of the top of the vertical mill, the high-pressure fan is connected with the fan motor, and the air inlet of the high-pressure fan is set at the powder selection At the bottom of the chamber, one end of the return air duct is connected to a high-pressure fan, and the other end is respectively connected to the top of the cyclone separator.

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