CN102580928A - Method for classifying silicon carbide micro powder and classifying equipment of method - Google Patents
Method for classifying silicon carbide micro powder and classifying equipment of method Download PDFInfo
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- CN102580928A CN102580928A CN2012100489517A CN201210048951A CN102580928A CN 102580928 A CN102580928 A CN 102580928A CN 2012100489517 A CN2012100489517 A CN 2012100489517A CN 201210048951 A CN201210048951 A CN 201210048951A CN 102580928 A CN102580928 A CN 102580928A
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Abstract
The invention discloses a method for classifying silicon carbide micro powder and classifying equipment of the method, which belong to the technical field of classification of micro powder. The method mainly includes steps that the silicon carbide micro powder sequentially enters at least two classifying machines which are serially connected, each classifying machine is provided with a self-suction sealing device, the classifying precision of each downstream classifying machine is higher than that of the adjacent upstream classifying machine, a cyclone collector is connected with the tail-end classifying machine and collects sorted silicon carbide micro powder; a bag dust collector collects waste discharged from the cyclone collector, and a system is powered by an induced draft fan disposed on a downstream of the bag dust collector. By the aid of the method and the classifying equipment, technical problems that in the prior art, the classifying precision of silicon carbide micro powder is low, extraction rate of fine powder is low, distribution of granularities of finished products is wide are solved. In addition, the method and the classifying equipment are widely applied to finely classifying silicon carbide grains.
Description
Technical field
The present invention relates to a kind of pressed powder stage division and grading plant, relate in particular to a kind of silicon carbide micro-powder stage division and classifying equipoment.
Background technology
Carborundum (molecular formula sic) is to utilize quartz sand and high-quality petroleum coke charcoal under the electric furnace high temperature action, and formed a kind of combination product is widely used in various fields such as industrial grinding tool, refractory material, smelting iron and steel, military project space flight.Carborundum accretion preparation technology is following: adopt bag to mix technology phenolic resins class raw material and silica flour are prepared into the powder precursor; Then through carbonization and calcining; Prepare good sphericity, narrow diameter distribution and uniform submicron silicon carbide powder, its average grain diameter is about 0.1 μ m.The generative process of submicron silicon carbide powder is that silicon-phenolic resins nucleocapsid powder precursor generates silico-carbo nucleocapsid powder through 800 ℃ of carbonization treatment; At 1500 ℃ of sintering, liquid-state silicon and the reaction of carbon shell internal layer generate silicon carbide layer; The carborundum shell is broken under the impact of thermal stress and liquid-state silicon; The submicron silicon carbide particle that forms gets in the liquid-state silicon; Through the continuous circulation of carborundum generation, fragmentation, new silicon carbide layer constantly advances until generating the submicron silicon carbide spherical powder fully to carbon-coating.
Tradition silicon carbide micro-powder classification meeting adopts the single-stage grader to carry out.General single-stage gas flow sizing machine mainly is made up of motor, grader housing and extension set wheel.In the unit grader, the driven by motor grading wheel rotates in classification housing high speed, and rotating speed can be regulated arbitrarily, in grader, forms powerful centrifugal force.The primary mixture that enters into grader is introduced into grading wheel inside; Under action of centrifugal force; Big or heavy particle centrifugalization power is big; So got rid of to the grading wheel periphery wall, and no longer receive the influence of centrifugal force, drop to naturally to pulverize to continue in the main frame to pulverize and perhaps drop to discharging opening and collect to the grader limit; Little or light material receives centrifugal action little, hovers in grading wheel inside, influenced by the air inducing power of air-introduced machine and is brought to eminence, moves in next assembly by classification or collection along pipeline.Just can adjust the size of centrifugal force in the grader through the rotating speed of variable frequency adjustment grading wheel, reach the purpose of the silicon carbide micro-powder of telling designated size.But generally all there are defectives such as effectiveness of classification is low, the fine powder recovery rate is low, the finished product size distribution is wide; Simultaneously, the large granular materials that has between grading wheel and the body gets into, because grading wheel need rotate and be installed in the body; So there is a movable sealing between grading wheel and the body; In industries such as the abrasive material of granularity requirements narrowly distributing, fluorescent material, aluminium powder, grain graininess is little, very easily leaks out through the gap between grading wheel and the body; Cause the waste of environmental pollution and raw material, the finished product size distribution is wide.
Summary of the invention
Technical problem to be solved by this invention is: a kind of silicon carbide micro-powder stage division is provided, to solve the technical problem that the silicon carbide micro-powder effectiveness of classification is low, the fine powder recovery rate is low, the finished product size distribution is wide.
For solving the problems of the technologies described above; Technical scheme of the present invention is: the silicon carbide micro-powder stage division; May further comprise the steps: silicon carbide micro-powder gets at least two graders that are cascaded successively; Described grader has the self-priming gas sealing mechanism, and the grader effectiveness of classification in downstream is higher than the grader effectiveness of classification at the upper reaches, and cyclone collector connects the silicon carbide micro-powder that terminal grader collection sub-elects then; Sack cleaner is collected the waste material of being discharged by cyclone collector, and the power of system is provided by the air-introduced machine that is arranged at the sack cleaner downstream.
Another technical problem that the present invention also solves is: a kind of silicon carbide micro-powder classifying equipoment is provided, with the technical problem that sealing effectiveness is poor, the finished product size distribution is wide between the grading wheel that solves grader and the body.
For solving the problems of the technologies described above; Technical scheme of the present invention is: the silicon carbide micro-powder classifying equipoment; Comprise the feed arrangement that connects successively, grader, cyclone collector, sack cleaner and the air-introduced machine that at least two are cascaded; Said grader comprises: the grading wheel that is installed on the body and is driven by power set, said grading wheel is positioned at said body, is provided with the self-priming gas sealing mechanism between said grading wheel and the body.
As a kind of improvement; Said self-priming gas sealing mechanism comprises first labyrinth ring and second labyrinth ring that cooperatively interacts; Said first labyrinth ring is fixedly installed on the said body and said first labyrinth ring is provided with annular groove, and said second labyrinth ring is fixedly installed on the said grading wheel and said second labyrinth ring is provided with annular ridge; Said body is provided with inlet channel, and said inlet channel is communicated with said annular groove.
Improve as another kind; The body of said grader is provided with the secondary air device; Said secondary air device comprises the orifice plate that is fixedly installed on the body; The outside of said orifice plate is provided with cover plate, and said cover plate is provided with and the corresponding through hole in the hole site of said orifice plate, and said cover plate is connected through securing member with orifice plate.
As further improvement, the body of said grader is provided with inspection door, and said inspection door is corresponding with the position of grading wheel.
As further improvement, the blade surface of said grading wheel is provided with carburized layer.
Adopted technique scheme; The invention has the beneficial effects as follows: because the silicon carbide micro-powder stage division adopts repeatedly, multistage fine graded the realization, can adjust the effectiveness of classification of each grader, to obtain narrow particle size distribution, micro mist that effectiveness of classification is high; And because the effectiveness of classification of downstream hierarchy machine is higher than the grader effectiveness of classification at the upper reaches; Improved the fine powder recovery rate greatly, the micro mist that adopts this method to produce mainly shows following advantage: 1, have the physical aspect of favorable and stable, granularity is shaped as equivalance and the tool knife edge; Guaranteed the balanced self-sharpening of silicon carbide micro-powder, thereby guaranteed to be cut minimizing of material TTV as cutting blade material; 2, size distribution is concentrated and is even; 3, high thermal shock resistance and refractoriness under load are arranged, this has guaranteed the little linear expansion coefficient when loading is cut, thereby guarantees the stability of cutting; And can good suitability be arranged with cutting machine; 4, the surface is through specially treated, and micro mist possesses the big specific area and the appearance of cleaning, with cutting fluid such as polyethylene glycol good joining property of reality is arranged.
Owing to designed at least two graders that are cascaded, each grader all has independent power set to drive, and therefore can adjust the effectiveness of classification of each grader, to obtain narrow particle size distribution, micro mist that effectiveness of classification is high; Again owing to be provided with first labyrinth ring and second labyrinth ring that cooperatively interacts between grading wheel and the body; Adopt the labyrinth seal mode between first labyrinth ring and second labyrinth ring, and designed inlet channel and be communicated with the annular groove on first labyrinth ring, make under the grading room suction function; Just can produce the natural wind that flows by in the export-oriented grading room of body in the inlet channel; Both stop bulky grain and got into grading room, realized self-priming hermetic seal again, solved the movable sealing problem of grading wheel and body.
Because the body of grader is provided with the secondary air device, through rotating the angle between adjustment cover plate and the orifice plate, the hole that can cover or open varying number; Obtain different intakes; And this air intake adopts natural wind fully, is different from traditional power air intake, has reduced energy resource consumption.
Because the blade surface of grading wheel is provided with carburized layer, has improved the hardness and the rigidity of blade, blade is indeformable when having guaranteed the high rotating speed of grading wheel, has prolonged the service life of grading wheel.
Description of drawings
Fig. 1 is the operation principle sketch map of the embodiment of the invention;
Fig. 2 is the structural representation of embodiment of the invention grader;
Fig. 3 is the partial enlarged drawing of A portion among Fig. 2;
Fig. 4 is the partial enlarged drawing of B portion among Fig. 2;
Among the figure: 1, feed arrangement, 2, first grader, 3, second grader, 4, cyclone collector, 5, sack cleaner; 6, air-introduced machine, 7, body, 8, grading wheel, 9, variable-frequency motor, 10, discharging opening; 11, charging aperture, 12, the secondary air device, 13, first labyrinth ring, 14, second labyrinth ring; 15, inlet channel, 16, holding screw, 17, orifice plate, 18, cover plate.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
As shown in Figure 1; A kind of silicon carbide micro-powder stage division; May further comprise the steps: silicon carbide micro-powder gets at least two graders that are cascaded successively, and described grader has the self-priming gas sealing mechanism, and the grader effectiveness of classification in downstream is higher than the grader effectiveness of classification at the upper reaches; Promptly the effectiveness of classification of second grader 3 is higher than the effectiveness of classification of first grader 2; Cyclone collector 4 connects the silicon carbide micro-powder that terminal grader collection sub-elects then, and sack cleaner 5 is collected the waste material of being discharged by cyclone collector 4, and the power of system is provided by the air-introduced machine 6 that is arranged at sack cleaner 5 downstream; Adjust the effectiveness of classification of first grader 2 and second grader 3 respectively, just obtain narrow particle size distribution, micro mist that effectiveness of classification is high.
Shown in Fig. 1, Fig. 2 and Fig. 3 are common; A kind of silicon carbide micro-powder classifying equipoment comprises successively the feed arrangement that connects 1, at least two graders that are cascaded, cyclone collector 4, sack cleaner 5 and air-introduced machines 6, and feed arrangement 1 is common has screw feed and air blast charging; Grader can be provided with two and be cascaded; Also can be provided with three and be cascaded, certainly, under the prerequisite that pressure allows; More a plurality of graders also can be set to be cascaded; Said grader comprises: the grading wheel 8 that is installed on the body 7 and drives by power set, and said power set are preferably variable-frequency motor 9, and said grading wheel 8 is positioned at said body 7; Be provided with the self-priming gas sealing mechanism between said grading wheel 8 and the body 7; Said self-priming gas sealing mechanism comprises first labyrinth ring 13 and second labyrinth ring 14 that cooperatively interacts, and said first labyrinth ring 13 is fixedly installed on the said body 7 and said first labyrinth ring 13 is provided with annular groove, and said second labyrinth ring 14 is fixedly installed on the said grading wheel 8 and said second labyrinth ring 14 is provided with annular ridge; Said body 7 is provided with inlet channel 15, and said inlet channel 15 is communicated with said annular groove, and annular groove is connected with body 7 outside atmosphere.
For the case hardness of the blade that improves grading wheel 8, prolong the service life of grading wheel 8, the blade surface of said grading wheel 8 is provided with carburized layer, and blade is indeformable when having guaranteed the high rotating speed of grading wheel 8.For ease of the operating position of inspection grading wheel 8, the body 7 of described grader is provided with inspection door, and said inspection door is corresponding with the position of grading wheel 8.
Shown in Fig. 1 and Fig. 4 are common; The body 7 of described grader is provided with secondary air device 12; Said secondary air device 12 comprises the orifice plate 17 that is fixedly installed on the body 7; The outside of said orifice plate 17 is provided with cover plate 18, and said cover plate 18 is provided with and the corresponding through hole in the hole site of said orifice plate 17, and said cover plate 18 and orifice plate 17 are connected through securing member; Common said securing member is selected holding screw 16 for use, through shutoff or the hole of opening varying number on the orifice plate 17 to obtain different intakes.
Its course of work is following:
Shown in Fig. 1 and Fig. 2 were common, material was delivered to the charging aperture 11 of first grader 2 by feed arrangement 1, got into the grading room of first grader 2; Under the effect of secondary air device 12 ascending airs; The clear and definite material diversion layer of formation in graded region, the variable-frequency motor 9 of first grader 2 drives grading wheels 8 and rotates, and makes the charging aperture 11 of the powder of the qualified fineness that meets the 2 classification requirements of first grader through discharging opening 10 back entering second grader 3 of first grader 2; Variable-frequency motor 9 rotating speeds of second grader 3 want high than variable-frequency motor 9 rotating speeds of first grader 2; Resulting raw meal particle size is refinement more, and fine powder gets into cyclone collector 4, and a small amount of micro mist gets into sack cleaner 5 and captures; Purified gas is discharged by air-introduced machine 6; Meal is fallen the bottom along body 7 and is collected because gravity sends back to grading room once more with other impact energy effects, is discharged by device for discharging; In first grader 2 and second grader 3, just obtain the micro mist of two kinds of granularities like this, wherein the micro mist in second grader 3 is particularly even.
Reasonable in design of the present invention, automaticity is high, is widely used in various milling equipments such as ball mill, Raymond mill, impact grinding, airflow milling and forms closed circuit or open system.
The present invention is not limited to above-mentioned concrete embodiment, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, all conversion of having done all drop within protection scope of the present invention.
Claims (6)
1. silicon carbide micro-powder stage division; It is characterized in that; May further comprise the steps: silicon carbide micro-powder gets at least two graders that are cascaded successively; Described grader has the self-priming gas sealing mechanism, and the grader effectiveness of classification in downstream is higher than the grader effectiveness of classification at the upper reaches, and cyclone collector connects the silicon carbide micro-powder that terminal grader collection sub-elects then; Sack cleaner is collected the waste material of being discharged by cyclone collector, and the power of system is provided by the air-introduced machine that is arranged at the sack cleaner downstream.
2. silicon carbide micro-powder classifying equipoment; It is characterized in that; Comprise the feed arrangement that connects successively, grader, cyclone collector, sack cleaner and the air-introduced machine that at least two are cascaded; Said grader comprises: the grading wheel that is installed on the body and is driven by power set, said grading wheel is positioned at said body, is provided with the self-priming gas sealing mechanism between said grading wheel and the body.
3. silicon carbide micro-powder classifying equipoment as claimed in claim 2; It is characterized in that; Said self-priming gas sealing mechanism comprises first labyrinth ring and second labyrinth ring that cooperatively interacts; Said first labyrinth ring is fixedly installed on the said body and said first labyrinth ring is provided with annular groove, and said second labyrinth ring is fixedly installed on the said grading wheel and said second labyrinth ring is provided with annular ridge; Said body is provided with inlet channel, and said inlet channel is communicated with said annular groove.
4. silicon carbide micro-powder classifying equipoment as claimed in claim 2; It is characterized in that; The body of said grader is provided with the secondary air device, and said secondary air device comprises the orifice plate that is fixedly installed on the body, and the outside of said orifice plate is provided with cover plate; Said cover plate is provided with and the corresponding through hole in the hole site of said orifice plate, and said cover plate is connected through securing member with orifice plate.
5. silicon carbide micro-powder classifying equipoment as claimed in claim 4 is characterized in that the body of said grader is provided with inspection door, and said inspection door is corresponding with the position of grading wheel.
6. silicon carbide micro-powder classifying equipoment as claimed in claim 5 is characterized in that the blade surface of said grading wheel is provided with carburized layer.
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| CN2012100489517A CN102580928A (en) | 2012-02-28 | 2012-02-28 | Method for classifying silicon carbide micro powder and classifying equipment of method |
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Application publication date: 20120718 |