CN1013648B - Air-jet mill - Google Patents
Air-jet millInfo
- Publication number
- CN1013648B CN1013648B CN 86104423 CN86104423A CN1013648B CN 1013648 B CN1013648 B CN 1013648B CN 86104423 CN86104423 CN 86104423 CN 86104423 A CN86104423 A CN 86104423A CN 1013648 B CN1013648 B CN 1013648B
- Authority
- CN
- China
- Prior art keywords
- nozzle
- grinding chamber
- grinding
- mill
- airslide disintegrating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000227 grinding Methods 0.000 claims abstract description 79
- 239000000463 material Substances 0.000 claims abstract description 41
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- 238000005194 fractionation Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000003507 refrigerant Substances 0.000 claims description 5
- 238000004381 surface treatment Methods 0.000 claims description 4
- 239000003082 abrasive agent Substances 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000010419 fine particle Substances 0.000 abstract description 2
- 239000012815 thermoplastic material Substances 0.000 abstract description 2
- 239000013013 elastic material Substances 0.000 abstract 1
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- 239000008188 pellet Substances 0.000 description 10
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- HOQADATXFBOEGG-UHFFFAOYSA-N isofenphos Chemical compound CCOP(=S)(NC(C)C)OC1=CC=CC=C1C(=O)OC(C)C HOQADATXFBOEGG-UHFFFAOYSA-N 0.000 description 2
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- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
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Images
Landscapes
- Disintegrating Or Milling (AREA)
Abstract
The present invention relates to an airflow grinder with a preground cavity and an inner size stepper. The present invention is suitable for carrying out fine grinding (below 10 micrometers) and low temperature grinding, and under the given condition, the surface is treated when a hard material, an elastic material or a thermoplastic material is ground. A device of the present invention is denoted to be an energy saving device. The present invention does not contain any movable component seriously abraded, and one inner size stepper becomes one of complete component parts of grinding space. The former uses the energy remaining after grinding in a system, so the purpose that fine particles can be obviously screened can be reached.
Description
Of the present invention to as if a kind of energy-conservation interior screening formula airslide disintegrating mill, it has one and is suitable for various carbide, silicate, oxide, ore, pigment or chipped material are carried out fine gtinding and these same materials are carried out surface treatment and/or carry out the pre-mill of cryogrinding.
According to prior art, airslide disintegrating mill can be traced back to five kinds of fundamental types.First type operating characteristic is with nozzle material to be accelerated at a high speed, impacts towards so-called anvil block, produces and grinds.This device can produce enough grinding effects, yet because distinctive high energy, its operation is uneconomic, and lining presents serious wearing and tearing, thus the product that forms of contamination grinding greatly.
In order to eliminate this polluting effect, in fact often use the lining made from material identical materials to be ground.The most famous pattern of using of this class is eddy-current system (Vortex system) airslide disintegrating mill that has outer separator, ceramic chamber lining and anvil block now.Another kind of widely used airslide disintegrating mill is called as micronizer (Majec mill).Here, pulverization be by two each other the acceleration that spout produced on opposite cause pellet to impact mutually and the spontaneous grinding effect that forms is produced.Yet its operation presents energy loss, and pulverization efficient is very low.This is because this nozzle can transport a small amount of pellet, and the relative injection of air stream also produces eddy current, thereby significantly reduces the number of pellet collision.Such well-known example is Germany DE254369102 and Germany DE252347102.
The third so-called micropulverizer type (Micrxizor type) airslide disintegrating mill is a kind of the most widely used pulverizer always.The essence of its operation is to utilize the playpipe outwards effect of ejection of gas from circumferentially being provided with along discus shape grinding chamber, produces in discus shape grinding chamber and grinds.Air-flow at first contacts the circle at the milling area outside 1/3 or half place.Material to be ground with the vertical plane that intersects of circle tangent line in enter grinding chamber, still, become 60 ° of angles with the vertical line that pushes up by grinding chamber.
Theory according to these designers, granularity flows along described annulus greater than the pellet of pre-determined amount, discharge by blocking collet from this device as the less pellet that grinds finished product, thicker pellet is under the effect of the gas that sprays from the nozzle along circumferentially setting, mutually collision and lasting circulation, up to the pellet granularity less than the value that requires.Under actual operating conditions, the operation of this device does not also meet the condition that above-mentioned theory is operated, yet this type is the best machine of present widely used efficient.There is several patents to invent the development that relates to such airslide disintegrating mill, for example U.S. US3726484 and Germany DE32017781.These technical solutions have been represented the combination of two airslide disintegrating mills, anvil block type pulverizer and micropulverizer, in these technical schemes, or the product that makes Coarse Aggregate again feed-in grind the space, or attempt to use the pre-mill of anvil block type, but almost do not obtain any progress for improving the fineness of grind aspect.Therefore, so far industrial the most normal use be the sort of have certain lining without the fundamental type that changes.
The 4th type airslide disintegrating mill, its purpose be by the free-moving route method of a kind of unlikely shortening particle, increasing the output of pulverizer,
In order to help this purpose, increased the quantity of the capacity and the nozzle of grinding chamber, with regard to the unit capacity of pulverizer, relatively increased the output of pulverizer, however energy utilization efficiency descended, wearing and tearing also increased.Such pulverizer is called air-flow sub-sieve pulverizer (Jet-O-Mizer) or is called reduction-type pulverizer (Reductionizer).In order to reduce wearing and tearing, the design of two impact grinders (Double-lmpact-Mill) has appearred on the market.In some occasions, the reversion branch at the pulverizer top has used the size fractionation device (directional-chang-sizer) of a so-called change direction and has more ground nozzle.But use the pulverizer of these types, successfully do not obtain size as yet and be 1 micron pellet.
Fluidized bed air flow crusher belongs to the 5th type, Germany DE3140294C2 for example, wherein use four large diameter nozzles, compared with former nozzle opposite each other and that be positioned at the bulk container bottom, the frequency of particle encounter and thus obtained grinding efficiency have all increased.The operation of nozzle makes all material in the container reach fluidisation, causes the fine particles that has ground to be derived by the rotation size fractionation device of container top earlier.Therebetween, thicker particle gets off along the chamber wall landing, so that grind again.
This device presents good grinding and screening efficiency, yet, it is not suitable for being lower than 10 microns fine gtinding, in part because of the Particle Density height, make its path contraction, be little thereby make the impact energy of particle, in addition, partly cause is the rotating speed because of size fractionation device rotating part, and just the fineness of finished product can not be brought up to above certain limit.Another shortcoming of this design is that high wearing and tearing appear in the rotating part of size fractionation device, because the high superpressure of grinding chamber, the material of packing into only can just can be taken out of with relevant gate valve system.According to all types of knowledge of being accepted so far, can confirm, if particle has high energy and high impact probability is arranged, then help the efficient of air jet system.Increase the number of solids, can increase the probability of impact thus, yet the needed free path-length of accelerated particle shortens, for this reason, impact energy also reduces, and this has become the basic problem of the air jet system of operation, therefore needs a compromise proposal.
The objective of the invention is to develop a kind of structure of airslide disintegrating mill, can be used for the stone flexible or thermoplastic material of fine gtinding extremely less than 10 microns, pulverizer is wanted can be energy-conservation, and it does not comprise any movable member, to present high wearability.Its feature is that a built-in size fractionation device will be arranged, as the part of the whole of pulverizer.Its sub-sieve performance should be very tangible, and clasfficiator is the major part that not consume the effect institute energy requirement of pulverizing.
The present invention is based on for the understanding of the effect of following technical characterictic and produces, promptly
If adopt pre-the grinding, fully increase the number of nozzle and make their arrangement suitable, thicker particle is back in the pre-grinding chamber, grinding efficiency can be improved widely.
If the circumferential nozzle of selected enough numbers can make all these nozzles can both be used for finishing same grinding work,
If the cancellation movable member makes material send into tangential direction at horizontal plane, can make the wearing and tearing of grinding chamber reach minimum, even this can make the part of pre-grinding chamber change easily,
If use the pilot jet the same with converging the jet nozzle number, thereby induced material turns to from the chamber wall, and the wearing and tearing of pre-grinding chamber are reduced greatly,
If develop one group of blade of new profiling sleeve member and employing adjustable vane angle, utilize and grind the back energy remaining, and needn't import any external energy, can obtain very strong inside sub-sieve (the abrasive particle scope is 0.1～100 micron),
If adopt enough axial adjustment of nozzle, can make and form vacuum in the feed aperture, like this can feed and supply with the material that was ground again, and the surface-treated material is carried out in supply and/or refrigerant enters system.By this way, this device also is suitable for grinding the surface treatment of thermal sensitivity and elastomeric material,
If in grinding chamber, regulate the angle (guiding material is returned from the chamber wall) of circumferential nozzle, can reduce impact number of times suffered on the wall of chamber, the motion of material can obtain best adjusting like this.
According to the present invention, structure with regard to airslide disintegrating mill, material is supplied with the tangential direction that can occur in the grinding chamber horizontal plane, except good grinding efficiency, can also reduce the wearing and tearing (just there are the wearing and tearing of this grinding chamber in the micropulverizer type) of grinding chamber like this.Also can use pre-grinding chamber in addition, because can improve grinding efficiency greatly by the less particle of its material of supplying with.Circumferentially the selected of the number of nozzle and position should help making each nozzle to finish identical grinding work; Answer facility to feed in raw material and behind each second nozzle, enter grinding chamber.
For example, if use six circumferential nozzles and three playpipes that tangentially is placed, then according to the result of testing, nonferromagnetic substance can be brought up to three times.
In order further to improve grinding efficiency,, can get back to pre-mill by a passage by the vacuum action of reinforced passage generation from the thicker pellet of grinding chamber.Material feed introduction (injection channel) is connected with pre-grinding chamber, the latter has wear-resisting lining, two or more nozzles are adjusted to 90 °-180 ° angle and/or staggered in the plane mutually on the pre-grinding chamber, so that make these nozzles can converge the ground blasting materials.In the occasion of converging nozzle of operation more than two, two nozzles play a part to provide material, and all the other nozzles are used to reduce the probability that particle impacts the chamber wall, reduce wearing and tearing.
According to the present invention, the arrangement of nozzle will cause producing eddy current just, promptly increases the number of particle impacting, and can make like this has extraordinary abrasive action in the pre-grinding chamber.Injecting nozzle also is suitable in the new material that will carry out the surface grinding processing and/or refrigerant introducing and the corresponding system of required special grinding technique, that is to say as long as suitably regulate injecting nozzle, in the feed aperture, will produce vacuum, thereby refrigerant and any reagent are inhaled into.Produced eddy current although converge nozzle, but, can make their arrive grinding chamber like this by still making pre-grinding material enter grinding chamber to the coaxial injection nozzle of the ascending pipe of enough speed (velocity of sound several times) with in system, presenting maximum pressure and be suitable for quickening grinding in advance material.
Relation between investigation crush efficiency and the pressure has obtained following result, and pressure increases to 9 crust, efficient has improvement slightly, and in 9-15 bar pressure scope, efficient increases sharply, do not coexist in the 15-25 bar pressure scope with material at last, seriously cohesion takes place, crush efficiency reduces.
A kind of airslide disintegrating mill that may design among the present invention has four nozzles to be connected with it on the tangential direction of pre-grinding chamber, and vertical with grinding chamber from the air-flow of pre-grinding chamber, gas sprays by producing eddy current with the contacting of circumference of pre-grinding chamber.In this solution, two horizontal nozzles such as spray together at the material that grinds, and other two perpendicular nozzle then import this system with gas or air.The latter may be connected to the container that fills reagent or refrigerant.There are three ascending pipes on three points, to be connected to grinding chamber tangentially, all claim ground to settle six circumferential nozzles that can rotate around their vertical axises at there.Grinding chamber is sent coarse fodder wherein back to pre-mill by means of the feed back pipe.Built-in size fractionation device is a symmetry axis with the axis of grinding chamber, and the former is made up of the surface of the hyperboloid of revolution and one group of adjustable blade, this group blade and abrasive material efferent duct coaxial line.
The pre-grinding chamber development model of the another kind of airslide disintegrating mill that may design is with aforementioned different among the present invention.In this solution, in vertical cylindrical pre-mill chamber, have two mutual angles to compile injection nozzle on the axis that injection nozzle and another be arranged on blowpipe in 150 ° of-180 ° of scopes, these three nozzles can be connected with charging hopper separately.
Any of above-mentioned airslide disintegrating mill, material to be ground all with required quantity, flow on entry table or the feed disk the eccentric vibration of the latter by gravity from hold-up tank.Material flows to the loading hopper of settling along web from feed disk uniformly.Below will be with reference to the accompanying drawings, in conjunction with embodiments of the invention, the present invention is further illustrated.
Fig. 1 represents the cross section of the possible tactic pattern of airslide disintegrating mill of the present invention;
Fig. 2 represents along the profile of 1-1 line shown in Figure 1;
Fig. 3 represents the cross section of another possibility structure;
Fig. 4 represents the axial cross section of the feed system of airslide disintegrating mill of the present invention.
Press one of possible structure shown in the example, as Fig. 1 and Fig. 2 as seen, three pre-mills [1] are connected with grinding chamber [2].The nozzle [7] that compiles that is placed in the nozzle housing [6] is connected with pre-grinding chamber [5] by feed pipe [9] with injection nozzle [8], and pre-grinding chamber [5] is equipped with anti-wearing liner, and the latter is realized by the floating moulding (Laval-profiles) of Lay.Have vertical pilot jet [8a], it is used for spraying cooling reagent medium, so that particle is carried out surface treatment.Pre-mill is connected with grinding chamber with feed back pipe [4] with ascending pipe [3].Circumferentially grind nozzle [10] and be contained in the grinding chamber well-balancedly, wherein 3 are called first nozzle [10 '], and 3 are called second nozzle [10 "], grinding chamber can rotate in horizontal plane by rotational angle locator [11].One anti-wearing liner [12] and one group of adjustable breast board of the blade relevant with angle [13] are arranged in grinding chamber [2].Be the angle of adjusting vane, tooth wheel rim [15] and short tube [14] are provided.As shown in Figure 2, short tube [14] links to each other with the axle of blade, and therefore when rotating short tube [14], blade [13] rotates together.On the other end of the axle of blade [13], a gear is set, this gear links to each other with tooth wheel rim [15], all blades spool all have a gear, when with gear rotation moving gear edge [15] that short tube [14] links to each other, spool also can the rotating of blade.From scheming as seen, discharge nozzle [17] is coaxial with the shell [16] of airslide disintegrating mill.Material supply pipe [18] and air intake duct [19] also are housed on this device.
Fig. 3 represents the possible pattern of another structure.At this, the design of pre-grinding chamber is fairly simple; The axis that compiles nozzle [7] that is arranged in the nozzle housing [6] becomes 150 ° of-180 ° of angles each other, preferably becomes 150 ° of angles.Compiling the angle of nozzle setting should select by this way according to the radius of pre-grinding chamber, promptly pre-velocity of grinding material is in the face of grinding chamber, and the compound direction that is to say the velocity of the material that flows through nozzle [7] should be to be on the geometrical axis of ascending pipe [3] and to point to grinding chamber [2].Grinding chamber [2], circumferentially nozzle [10] is identical with the previous embodiment situation with the adjustable one group of blade [13] and the supply situation of material.Fig. 4 has represented material supplying systems.Material is stored funnel [20] and has been installed adjustable louver [21].Material from funnel flow on the feed disk [23], is subjected to eccentric operating means [22] vibration, scatters material equably and identical materials is distributed to loading hopper [24], and the latter is connected to material supply pipe [18].
The major advantage of airslide disintegrating mill of the present invention is, compare with hitherto known device, it can the production granularity less than 10 microns pellet, in addition, can also carry out cryogrinding to thermoplastic, and under specific circumstances, also can when grinding, provide finish materials. The further advantage of this device is to utilize admirably energy, because wherein the built-in size fractionation device of modern design has played sizable effect. Compare with general same apparatus, the utilization ratio of grinding energy is increased to half as much again. Additional advantage is that this device does not comprise the movable member of any easy heavy wear, and one by one pre-grinding device lining of a structure member is only arranged, the easiest wearing and tearing that produce maximum, but can be replaced very cheaply.
Claims (7)
1, can carry out fine gtinding, the airslide disintegrating mill of surface treatment and/or cold grinding, this machine is provided with pre-mill [1], be connected to the annular grinding chamber [2] of pre-mill by ascending pipe [3], circumferential grinding nozzle [10] and be positioned at abrasive material discharge nozzle on its axle center in the grinding chamber [2], and built-in size fractionation device, it is characterized in that pre-mill [1] has nozzle housing [6], be contained in can produce eddy current in the nozzle shell [6] compile mouth [7] and an injection nozzle [8] coaxial with ascending pipe [3], the number of pre-mill [1] is consistent with the number of ascending pipe [3] and feed back pipe [4] to be three or more, they are connected with grinding chamber [2] with feed back pipe [4] with three or more ascending pipe [3], described ascending pipe [3] tangentially is connected on the described grinding chamber [2], the circumferential nozzle [10] of grinding chamber [2] is along the well-balanced distribution of a circumference, and circumferentially the number of nozzle [10] preferably injects the twice of nozzle [8].
2, airslide disintegrating mill as claimed in claim 1 is characterized in that the top of grinding chamber [2] presents bi-curved shape, and one group of blade [13] is arranged on the grinding chamber [2] and is removable, and the angle of blade can be regulated when wherein operating.
3, airslide disintegrating mill as claimed in claim 1 or 2 it is characterized in that compiling nozzle [7] for three or more and preferably become 90 °～180 ° angles to be provided with each other, and all nozzles can both carry out axial adjustment.
4, airslide disintegrating mill as claimed in claim 1 or 2 is characterized in that described circumferential grinding nozzle [10] is rotating in horizontal plane.
5, airslide disintegrating mill as claimed in claim 1 or 2 is characterized in that at grinding chamber and pre-grinding chamber stone removable lining [5] and [12] being arranged.
6, airslide disintegrating mill as claimed in claim 1 or 2 is characterized in that pulverizer and material storage funnel [20] being connected with feed disk [23] with adjustable louver [21], and is vibrated by the operating means [22] and the loading hopper [24] of an off-centre.
7, airslide disintegrating mill as claimed in claim 1 or 2 it is characterized in that the nozzle [7] that compiles of the level of pre-mill is connected with material supply pipe [18] with injection nozzle [8], and perpendicular nozzle [8a] is linked the hold-up vessel of refrigerant and/or finish materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86104423 CN1013648B (en) | 1986-06-27 | 1986-06-27 | Air-jet mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86104423 CN1013648B (en) | 1986-06-27 | 1986-06-27 | Air-jet mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86104423A CN86104423A (en) | 1988-01-06 |
| CN1013648B true CN1013648B (en) | 1991-08-28 |
Family
ID=4802461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86104423 Expired CN1013648B (en) | 1986-06-27 | 1986-06-27 | Air-jet mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1013648B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2443413C2 (en) * | 2006-11-02 | 2012-02-27 | Омрикс Биофармасьютикалс Лтд. | Method of micronisation |
| CN102872957B (en) * | 2012-09-29 | 2014-08-27 | 中国航天空气动力技术研究院 | Nanoscale solid powder preparing device |
| CN114345508B (en) * | 2022-03-18 | 2022-06-07 | 山西金山磁材有限公司 | Jet mill separation device and method capable of improving powder particle size distribution |
-
1986
- 1986-06-27 CN CN 86104423 patent/CN1013648B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN86104423A (en) | 1988-01-06 |
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