CN102794214A - Roller grinding device capable of stabilizing material layer and improving grinding effect of fine particles - Google Patents

Abstract

The invention discloses a roller grinding device capable of stabilizing a material layer and improving a grinding effect of fine particles and relates to a grinding process and a grinding device which are suitable for grinding micro powder substances, cement clinker and other particles. Materials enter a grinding disk 02 through a discharge pipe of the roller grinding device and are dried by hot air of an air chamber 03, and the ground micro powder is carried into a powder concentrator 01 and is sorted so as to obtain finished products of which the specific surface area is 450m<2>/kg; the materials are pre-compacted and distributed by material stabilizing rollers 04 with design of small-inclination angle roller surfaces to ensure that air is discharged, and a firm wedge shape is formed; grinding rollers 05 stably roll and crush the materials to ensure that the materials are thinned; the thinned materials are crushed by the grinding rollers and then staggered, and then are distributed by the material stabilization rollers again so as to form a wedge shape; the materials are distributed and ground by the material stabilizing rollers and the grinding rollers alternately to ensure that the materials can achieve the required fineness; and due to the design of the small-inclination angle roller surfaces, the key function of stabilizing the material layer is exerted, the sliding and blockage effects and vibration can be prevented by the roller arranging scheme with refined functions, the function of the device is enhanced, the vibration in a running process is reduced, the powder fineness can be controlled reliably, and the grinding efficiency can be improved simultaneously.

Description

A kind of stable bed of material improves the roll mill apparatus of subparticle grinding effect

Technical field

The present invention relates to a kind ofly smelt the roll mill apparatus that the slag (or similar substance) produced and clinker etc. are stablized its bed of material in than the fine grained process and strengthened the grinding effect in vertical roller grinder grinding such as steel plant; Vertical roller grinder through using this device is in grinding subparticle process; Pressure outgases to its bed of material and condenses, and forms the stable wedge shape bed of material, thereby gives full play to the grinding effect to material; Not only improved the fineness of abrasive product; And reduced energy consumption, and raise the efficiency, strengthened reliability of system operation.This method can for example be used for the slag and the similar substance of grinding steel industry adaptable across industries such as building materials, iron and steel, metallurgy, is to belong to the new and high technology field of rebuilding traditional industry.

Background technology

2 a large amount of μ m～50 μ m subparticles being arranged in such as cement grinding, 1 thinner μ m～30 μ m particles are arranged then during the slag micropowder grinding than fine grained.In the grinding process that adopts vertical roller grinder, need a large amount of wind that material web is gone into powder concentrator and select powder.Therefore under the condition that wind is swept; Because the brute force gasification of material bed and the swabbing action of system; Particulate wherein has great upward force, makes common vertical roller grinder can not intercept and capture a large amount of particle swarms completely effectively, the rubbing effect that common in addition grinding roller banking motion produces; It is uneven more to make that the bed of material distributes, and causes the slip of grinding roller easily.Its physical property of fine powder material of gasification cans be compared to liquid on the other hand, and the frictional force between internal friction and the contact-making surface is very little, and flowing velocity is very fast; The material bed is very thin; And can walk around grinding roller, only have the part materials flow to get into the gap between grinding roller and the mill, make operation unstable.These phenomenons can cause the pernicious consequence of the subsideing-slide of grinding roller-vibrate, and cause capacity usage ratio to reduce (conventional roller grinding system power consumption is about 45kWh/t during the high fineness slag of grinding).

Summary of the invention

The present invention is directed to existing problem in the process of grinding subparticle, in analysing particulates crushing mechanism and powder, on the basis of tribology principle, provide a kind of than the supporting vertical roller grinder device of stable material bed in the fine powder material grinding process.Use this vertical roller grinder device can improve material bed stablizing effect than fine powder material; Reduce the vibration of vertical roller grinder; Improve the mill efficiency in the grinding process; Under the condition of equivalents quality, reduce power consumption about 10% (system's power consumption is reduced to 40kWh/t or lower during the grinding slag micropowder) than common vertical roller grinder device.

The present invention utilize steady material roller add mixing roll the pair roller combination grinding join the roller scheme, change the grinding roller that specification is identical in the general vertical roller grinder into half the steady material roller and half mixing roll, two rollers are staggered.Steady material roller is that (roller directly is generally 0.127 times of mill diameter to wide roller minor diameter, and the roller of common vertical roller grinder directly is generally 0.5 times of mill diameter; The width of grinding roller is consistent with common vertical roller grinder), pure rolling effect design, promptly in grinding roller overall with scope, do not have speed difference, no shearing force with mill, the track that the small inclination roll surface designs in running has the feeding function.Steady material roller plays the effect of the regular bed of material in grinding system, to thinner material particles pull-up gas, cohesion, make it can form a comparatively closely knit wedge shape material bed, thereby make mixing roll can bring into play the grinding effect smoothly.On the other hand, steady material roller is fixed on certain height, blocks flowing of powder particle effectively, reduces flow velocity, makes it reach suitable material bed thickness.Grinding hard with frangible material the time to strengthen compression stress; Therefore mixing roll adopts narrow roller major diameter and makes it rely on the mill center; Make that the speed difference between grinding roller diameter at butt end and the top diameter is little, speed difference remaining on mixing roll is enough to avoid compacting to want the material of grinding.Through special rocker structure, make each mixing roll to being carried out independent loads by the fine particle of grinding, be independent of each other between each roller, avoid it that grinding machine body is produced macroseism.In addition, mixing roll has electric and mechanical dual stopping means, avoids making grinding roller and mill produce direct collision because the bed of material is low excessively.

Vertical roller grinder device used in the present invention is unique, and to join the roller design be the steady prerequisite implemented of material condition; Prepare in the process at micro mist, be transported to than fine granular materials and passed vane behind the vertical roller grinder tremie pipe from the hot blast in the mill lower air chamber and material is taken up carry out drying.The inflation particle swarm of dry back high concentration is unrestrained to mill; Through the steady material roller effect of small inclination roll surface design, it is regular that the material bed is stablized, and is more conducive to mixing roll it is carried out grinding; Fine powder carries out sorting through high-speed gas carry over score screening device, and specific area is more than or equal to 450m ²The fine powder of/kg becomes finished product as qualified fine powder, and the material that does not meet the demands is selected again and fallen back to and continues grinding on the mill, and the several that moves in circles is accomplished micro mist and prepared process.When it is characterized in that unrestrained inflation powder particle to mill, rely on its roll surface movement locus and material roller feeding effect can form firm wedge shape material bed, can make mixing roll intercept and capture the material of treating grinding more easily like this through steady material roller; Mixing roll design two speed difference is little, and each roller is independent of each other to being carried out independent loads by the subparticle of grinding, has avoided the rubbing effect that produces because of the roller slant operation; Bring into play its roll-in and grinding effect to greatest extent; Reduce the consumption of idle work, eliminated the vibration of slippage-blocking effect and grinding machine effectively, improved the capacity usage ratio of grinding machine; Power consumption is also more economized; Grinding machine operation simultaneously is more steady, has reduced fault rate and wearing and tearing, and the vertical roller grinder device reliability is improved.

Description of drawings

Come more detailed description the present invention through schematic accompanying drawing below:

Fig. 1 is the side-looking structural representation of vertical roller grinder of the present invention.

Fig. 2 is that the bed of material of the present invention is prepared sketch map.

Fig. 3 is a grinding roller arrangement sketch map of the present invention.

Fig. 4 unabridged version invention roll surface angle and roll shaft and horizontal mill card angle sketch map

The specific embodiment

The present invention will be described below in conjunction with accompanying drawing:

By shown in Figure 1; The condition of stable subparticle layer of the present invention and vertical roller grinder thereof relate to the grinding of the granule materials such as grog that the slag that produces such as smelting iron and steel and similar substance and cement rotary kiln produce, through using this device; Want the granule materials of grinding to be transported to that vertical roller grinder top tremie pipe is laggard goes into horizontal mill dish 02; Hot blast through air compartment 03 makes dry materials and brings the thin material behind the grinding into sorting unit and elected finished product in 01 minute as, and material carries out at first pre-compacted through steady material roller 04 to it, and gas is wherein discharged; Material forms firm wedge shape; Let mixing roll 05 can intercept and capture them very stably, roll-in and grinding it, forming wedge shape again through getting into steady material roller once more after the mixing roll crushing; The preparation that steady material roller and mixing roll replace and the grinding layer of grinding itself prevent slippage-blocking effect and produce vibration.Stablize the grinding bed of material in the vertical roller grinder, the operation vibration is reduced greatly, improved mill efficiency.The joining the roller scheme and can use two groups or three groups of balanced configurations of grinding roller.

Fig. 2 is a bed of material stand-by mode of the present invention, and Fig. 3 and Fig. 4 are for stablizing the method for the bed of material among the present invention, and when the inflation particle swarm of great deal of high concentration was trickled down to mill, steady material roller outgased to it and condenses, and makes it at first form firm wedge shape; Steady material roller is fixed on a suitable height, effectively blocks flowing of powder particle, reduces flow velocity, makes it reach suitable material bed thickness and material is carried out pre-compacted.Material after handling through steady material roller can let mixing roll intercept and capture easily they and grinding it.Thinner material is blown up through becoming roll surface that finished product and mixing roll adopt the small inclination design after the sorting and in motion process, has the feeding effect and can prevent that material is wandering and run slightly that thicker particle swarm is being pressed in the wedge shape slowly again again after the grinding layer is crushed.So steady material roller and mixing roll are alternately prepared and the material bed and mixing roll of grinding itself is positioned at after the steady material roller, prevent the generation of slippage-blocking effect and the vibration of mill body.

Claims (4)

1. the stable bed of material improves the roll mill apparatus of subparticle grinding effect, it is characterized in that, joins the roller scheme through the function refinement; Changed roll size simultaneously, other pattern roller mills of mixing roll roll width and the relative same specification of diameter reduce 15mn respectively and increase 150mm, and carry out different size roller steady material roller and mixing roll directly and form a complete set of; Again design reduces steady material roller face angle; Angle between the roll surface is kept to 25 ° by 30 °, changes the size and the two ends speed difference of mixing roll, spatial form and running orbit that steady material roller is contacted with the bed of material change; Roll mill apparatus forces to integrate unrestrained inflation powdered granule layer to the mill in running; Impel and form firm wedge shape when treating grinding material through steady material roller, bed of material equalization stable helps the bigger grinding efficiency of mixing roll performance, to mixing roll best grinding condition is provided; Eliminate mixing roll because of the roller slant operation or with the rubbing effect that the speed difference of mill produces, improve the effect of roll mill apparatus.

2. in the vertical roller grinder grinding process, join the roller scheme by the stable subparticle described in the claim 1; It is characterized in that; The special roller scheme of joining of refinement function, general vertical roller grinder has the grinding roller of identical specification, even if adopt different grinding rollers; Its roll surface does not have the present invention yet adopted reduce the design of roll shaft to center line and horizontal plane angle; Central roll longitudinal center line of the present invention and horizontal mill card angle are 12.5 ° and are less than 15 ° that other pattern rollers grind, and the present invention replaces half grinding roller wherein with less grinding roller, and each comprises 1 little steady material roller and a big mixing roll to grinding roller; Utilizing independent grinding roller (steady material roller) that material is carried out pre-compacted outgases; And the roll surface that adopts the small inclination design has the feeding effect and can prevent that material is wandering and run slightly in motion process, makes it form the firm wedge bed of material, for follow-up grinding process performs the material work that overlays; Use independent grinding roller (mixing roll) to act on the wedge bed of material again, it is levigate that its producing balanced forces is easier to by material, and reduced power wastage.Device construction configuration makes mixing roll be positioned at grinding material behind the steady material roller, and generally the two is evenly distributed in around the mill, forms the alternate cycles effect, accomplishes whole grinding process.The roller scheme of joining of grinding roller can be according to the production capacity requirement with two groups or three groups of balanced configurations.

3. be used to realize that the roll mill apparatus of claim 1 stablizes the steady material roller of the subparticle bed of material; It is characterized in that; Mechanical aspects is wide roller minor diameter, according to the pure rolling design, promptly in grinding roller overall with scope, does not have speed difference, no shearing force with mill; Reduce roll shaft and can prevent that when the center line and the angle design of horizontal plane angle make roll surface contact with the bed of material material from running slightly, has the feeding integration to the bed of material.Aborning, when the inflation particle swarm of high concentration was trickled down to mill, these inflation powdered granules were just as liquid, and it is very low to rub in it, and gas injection effect in addition can weaken the grinding effect.Utilize steady material roller that it is carried out partly degassed, make fine particle form a comparatively closely knit wedge shape bed of material, thereby can mixing roll more effectively played a role.Utilize the lifting force of hydraulic system that steady material roller is fixed on a certain suitable height simultaneously, effectively block flowing of powder particle, reduce flow velocity, make it reach suitable material bed thickness and material is carried out pre-compacted, further strengthened steady material effect.

4. be used to realize that the roll mill apparatus of claim 1 plays the mixing roll of grinding effect; It is characterized in that; Grinding hard to strengthen compression stress with frangible material; Therefore mixing roll adopts narrow roller major diameter and makes it rely on the mill center, makes that the speed difference between grinding roller diameter at butt end and the top diameter is little, and speed difference remaining on mixing roll is enough to avoid compacting to want the material of grinding.Through special rocker structure, make each mixing roll to being carried out independent loads by the subparticle of grinding, be independent of each other between each roller, avoid it that grinding machine body is produced macroseism.In addition, mixing roll has electric and mechanical dual stopping means, avoids making grinding roller and mill produce direct collision because the bed of material is low excessively.

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