CN1583291A - Industrial continuous powder frequency steam vibrative screening mill - Google Patents
Industrial continuous powder frequency steam vibrative screening mill Download PDFInfo
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- CN1583291A CN1583291A CN 200410046354 CN200410046354A CN1583291A CN 1583291 A CN1583291 A CN 1583291A CN 200410046354 CN200410046354 CN 200410046354 CN 200410046354 A CN200410046354 A CN 200410046354A CN 1583291 A CN1583291 A CN 1583291A
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Abstract
A continuous airflow vibration sieve for industry is composed of stirring motor, material feeding inlet, stirring rod, powder cabin, electromagnetic feeding valve, electromagnetically switched airflow vibration generator with industrial frequency, powder scraper, sieving nets, automatic electromagnetic discharge valve, sealing plate for outlet, N2 or Ar gas inflating valve, etc.
Description
Technical field
The invention belongs to powder technology powder material screening plant technical field, a kind of industrial continous way power frequency airstream vibration screening plant particularly is provided, be applicable to that work is sieved in the industrialization of various powder materials fast.
Background technology
The screening work of powder material.Occupy indispensable status in a lot of industries, two thousand years comes, and the mankind use various fibrous materials, made the simple screen cloth of all styles of, shake screening from manpower, develop into the mechanical oscillation screening, wave screening and cylinder screening, air-flow (liquid stream) press filtration screening etc.These screening plants play an important role in the process of industrial development.But make a general survey of the evolution of screening plant over thousand, almost be not have substantial improvement on the principle of screening plant, basically all belong to screen movement, the motion of drive powder material, be particle then,, from sieve screen apertures, fall by the powder granule deadweight less than sieve aperture, so repeatedly, promptly finish screening work.
Along with industrial development, above-mentioned screening plant has not satisfied the needs of High-efficient Production, this mainly is because above-mentioned screening plant, though adopt which kind of machinery vibration, wave or move back and forth, two aspects that all have contradiction, promptly back and forth or vibration frequency when low screening efficiency low, but frequency is when high, vibration equipment is big, and noise pollution is big, equipment life is low.According to nearly 35 years literature search as can be known, the powder technology researcher is devoted for years to research and design work in screening plant with great enthusiasm both at home and abroad.The begin one's study sound press and the airstream vibration that utilize acoustic vibration to produce of nineteen sixty-eight U.S. Suhm H.O carries out sieve test, and Japan had also carried out same test in 1972～1984 years, and nineteen eighty-two Japan and U.S.'s cooperation research and development this a kind of novel sound wave pulp classifier.Its principle is to convert the audio frequency power supply to sound wave to promote to sieve air vibration in the chamber, thereby makes powder particle, realize on screen cloth top jumping, thereby thinner particle falls realization screening work by deadweight from sieve aperture.The frequecy characteristic that nineteen ninety professor Wu Chengyi of University of Science ﹠ Technology, Beijing has studied audio frequency in great detail is to the influence of screening efficiency and designed the audio frequency air vibration sound wave pulp classifier of same-type, and this pulp classifier is still using in a lot of industries so far.
The great advantage of above-mentioned sound wave pulp classifier is the electric and magnetic oscillation with the audio frequency power supply, be transformed into the airstream vibration of audio frequency, the characteristics of this airstream vibration are the frequency height, amplitude is little, noise low (＜25dB), also the music VF power supply of available grace excites airstream vibration, thereby realized the perfect condition of noiselessness screening, but all exist fatal weakness in the design of above-mentioned all sound wave sieves, it is the capsule that is equipped with the resonance that is used for rebounding bottom of screen cloth, this design has caused the thinnest powder directly to fall into capsule, cause fine powder can not separate, thereby caused this pulp classifier, can not be used in the work of serialization large-scale screening and get on capsule.So this pulp classifier over nearly 22 years, does not have the improvement of essence, can only be used for doing the sample mesh analysis and use.
Summary of the invention
The object of the present invention is to provide a kind of industrial continous way power frequency airstream vibration screening plant, solved the difficult problem that bounce-back resonance capsule separates with fine powder, adopt cheap power frequency AC to produce the vibratory flow of power frequency (50 times/second) simultaneously.In the access way configuration and design of Sealing Structure of powder, finish and satisfied the Structural Design Requirement of continuous mass production.
The present invention disperses scraper plate 7, screen cloth 8,17,18, electromagnetism self-emptying valve 9, discharging opening sealing plate 10, powder discharge nozzle 11, cavity of resorption bounce-back resonance capsule 12, powder to disperse motor 13, frame 14, butterfly valve 15, lower floor's powder bucket 16, N by stirring motor 1, charging aperture 2, stirring rod 3, filler bin 4, Electromagnetic Control bell jar inlet valve 5, power frequency electromagnetic conversion airstream vibration generator 6, powder
2, Ar gas charge valve 19 forms.The structure of device as shown in Figure 1.
Powder to be sieved is entered in the powder feed bin 4 by charging aperture 2, and is built on stilts for preventing the powder bed of material, and stirring motor 1 is installed on the feed bin axis, to drive the stirring rod 3 in the powder layer, carries out the stirring work of powder.In the bottom of feed bin, the bell-jar inlet valve 5 of an Electromagnetic Control is installed, when 5 opened downwards, powder material will directly drop into the top of ground floor screen cloth 8.When starting electromagnetic conversion airstream vibration generator 6, in the sealed cavity of whole sieve, each layer screen cloth particularly, be in the sieve aperture of three layers of screen cloth among Fig. 1, powder boiling air-flow that the formation that will replace makes progress and downward negative pressure are inhaled the powder air-flow, thereby can be continuously with the powder particle of particle in the powder less than the upper sieve screen distance, the screen cloth of being left behind by the sucking action of negative-pressure air-flow, oarse-grained powder, the air-flow that is made progress blows afloat and the jump of constantly seething with excitement on screen cloth top again.After the powder on each layer screen cloth top sieves through certain hour, when no longer containing fine particle, starting powder disperses motor 13 and powder to disperse scraper plate 7, each layer meal that can not sieve, electromagnetism self-emptying valve 9 and 10 meal of discharging opening sealing plate of scraping to each layer flow out and the branch tank filling through powder discharge nozzle 11.The thinnest powder is through the thinnest screen cloth 17, falls and through the butterfly valve 15 lower floor's powder bucket 16 of packing into.
The present invention adopts the air-flow of power frequency air or nitrogen, argon gas vibration to sieve.At each layer screen cloth upper and lower faces, powder boiling air-flow that the formation that replaces makes progress and downward negative pressure are inhaled the powder air-flow, thereby can finish the sieving actoion of each layer screen cloth to powder material simultaneously.This screening plant is applicable to that the industrialization of various powder materials sieves work fast.For example: the various nonmetal superfines that beverage powder, flour, milk powder, medicine powder, cement, ore in sand form powder, bortz powder, dyestuff powder, the various micron orders of abrasive powder, nano level superfine metal dust, ceramic powders and proportion are very light etc.
In structure of the present invention, air-resilient resonance capsule contact with the thinnest powder, but in the garden that is configured in the outside, screen frame annular seal space bottom encircles.And the venthole of capsule and atmosphere are linked up, and no matter capsule is in positive half-wave or the vibration of negative half-wave, and the inwall of capsule does not contact with powder, so just can prevent that dust from adhering in inside capsule wall.Thereby solved the separate difficult problem of fine powder with the air-resilient capsule.
The invention has the advantages that:
(1) from producing equipment and technically providing a kind of and can carry out the serialization automation apace---sieve the device and the technology of work.Its application prospect is very wide.
(2) adopt the cheap power supply of power frequency supply as electromagnetism airstream vibration generator.Not only can reduce cost, can significantly reduce audio noise simultaneously and pollute.Framework vibrationproof requirement with complete machine.
(3) adopt in ad hoc garden, the outside ring in sieve bottom, chamber, lay a plurality of, in the give vent to anger reverse air resonance capsule of formula, this significant improvement has thoroughly solved, the adhesion of orlop fine powder and the capsule that resonates with separate a difficult problem.This design is very favourable to the powder screening pollution problem that solves food service industry and medicine company industry.
(4) since airstream vibration sieve be by air-flow in sieve screen apertures, the motion of upper and lower shuttle type, realize the sieve action down of fine powder, the effect of this screening is not influenced by powder density, so this power frequency airstream vibration sieve is when the very light ultra-fine non-metal powder of screening quality or micron order, nano level superfine metal dust and the powder of easily reuniting, screening efficiency than the high 30-50 of common mechanical vibratory sieve doubly.
(5) complete machine is in light weight, and all parts all do not use lubricants such as oils or lipid so more be applicable to food, medicine, the screening work of biological products etc. simultaneously.
(6) do not have fricting movement between powder material and the sieve cloth, so the high life of screen cloth, this is for material hardness high powder such as artificial diamond's stone powder, various carbide, and the screening work of ceramic powders such as oxide nitride is the most favourable.
(7) electrician of complete machine consumption leads very lowly, is generally less than 150w.
(8) can carry out screening work under inert gas shielding, this advantage is suitable for the screening work of nano level superfine active metal powder most, can make the danger of oxidation, burning, blast drop to minimum level.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention.Wherein, stirring motor 1, charging aperture 2, stirring rod 3, filler bin 4, Electromagnetic Control bell jar inlet valve 5, power frequency electromagnetic conversion airstream vibration generator 6, powder disperse scraper plate 7, screen cloth 8,17,18, electromagnetism self-emptying valve 9, discharging opening sealing plate 10, powder discharge nozzle 11, cavity of resorption bounce-back resonance capsule 12, powder to disperse motor 13, frame 14, butterfly valve 15, lower floor's powder bucket 16, N
2, Ar gas charge valve 19.
The specific embodiment
Embodiment 1 and effect are seen Fig. 1:
The power frequency airstream vibration sieve of three layers of screen cloth of preparation φ 600mm should be by following design
1. screen frame cylindrical shell preparation
A. the preparation internal diameter is φ 600mm earlier, and the totally-enclosed cylindrical shell of the stainless steel of high 500mm is cut into four sections that highly equate, seals to prevent the gas leakage of each section junction with flange coupling and with " O " shape sealing ring.
B. go up the discharge nozzle and the sleeve pipe of meal discharge nozzle 11, top feed bin 4 and the bottom of good each layer of welding in the position shown in the figure 1.
C. weld outer shroud and bottom double wall funnel swash plate, truck cylindrical shell tremie pipe, welding cylinder stent 14 and the N of the resonance capsule of cylindrical shell bottom
2, Ar gas intake valve 19.
2. design electromagnetism airstream vibration generator power and number
Be calculated as follows
Required oscillation power W 〉=0.02 watt/centimetre on the W-screen cloth unit are in the formula
2, the power summation of all airstream vibration generators of ∑ Wi-, watt.Adopt six airstream vibration generators in apparatus of the present invention, each power is 10 watts, and general power ∑ Wi is 60 watts.S
o---the single-deck screen web area, centimetre
2S among the design
o=π 30
2=2827 centimetres
2, by formula W calculates:
Meet the following formula requirement.6 power frequency electromagnetic conversion airstream vibration generators, be configured in the feed bin tremie pipe around, preparation evenly distributes
3. the design of air-resilient resonance capsule
Press
Formula designs the size of each capsule earlier, and calculates the surface area of vibration, and the present establishes the high 120mm of each capsule support φ 80mm gas outlet and do not vibrate, so the vibrometer area of each resonance capsule is S=352 centimetre
2
By formula
So select 8 resonance capsules for use, then evenly lay 8 resonance capsules on the top of outer shroud.
When electromagnetism bell jar bleeder valve 5, power frequency electromagnetic conversion airstream vibration generator 6, each layer screen cloth of upper strata feed bin, be respectively 63.5 μ m, 39.6 μ m, 25.4 μ m.Dish valve 15 in stirring electrode 1, stirring rod 3, charge pipe 2, bottom hopper, the tremie pipe, all install after, get final product preset operation, power frequency airstream vibration sieve enters operate as normal
5. embodiment 1 effect
Three kinds of average grain diameters that adopt moto-vibro screen to sieve be respectively 63.5～39.6 μ m, 39.6～25.4 μ m,＜Al of 25.4 μ m
2O
3Each 300 gram of powder in " V " shape batch mixer, mix after 15 minutes, and the effect of screening sees Table 1 in this device
Table 1 Al
2O
3Dressing sieve divides the effect contrast
| The powder kind | 63.5～39.6μm | 39.6～25.4μm | ＜25.4μm |
| Original ingredient is than (gram) | 300 | 300 | 300 |
| Power frequency airstream vibration sieve screening back proportioning (gram) | 298.96 | 301.03 | 300.01 |
| Difference (gram) | -0.04 | +1.03 | +0.01 |
First, second layer screen cloth in the embodiment equipment removed, but the 3rd layer of screen cloth adopts 500 orders, be that mesh size is the sieve cloth of 25.4 μ m, be the ultra-fine carbon black powder of 3.5 μ m again with average grain diameter, carry out the screening efficiency contrast test, the screening plant of contrast is certain company's product---a mechanical-vibration type pulp classifier, and the contrast condition is for respectively taking by weighing the ultra-fine carbon black powder of 300 grams, and the usable floor area of two screen clothes is 300 centimetres
2, all with the plastic adhesive tape sealing, the screening time is respectively and took by weighing minus sieve powder weight separately in 10,20,30,60,120,1800 minutes untapped screen area, and it the results are shown in Table 2
The contrast of table 2 carbon black powder screening efficiency
Claims (2)
1, a kind of industrial continous way power frequency airstream vibration screening plant is characterized in that: disperse scraper plate (7), screen cloth (8,17,18) electromagnetism self-emptying valves (9), discharging opening sealing plate (10), powder discharge nozzle (11), cavity of resorption bounce-back resonance capsule (12), powder to disperse motor (13), frame (14), butterfly valve (15), lower floor's powder bucket (16), N by stirring motor (1), charging aperture (2), stirring rod (3), filler bin (4), Electromagnetic Control bell jar inlet valve (5), power frequency electromagnetic conversion airstream vibration generator (6), powder
2, Ar gas charge valve (19) forms; The air of employing power frequency vibration or nitrogen, argon stream are sieved, and at each layer screen cloth upper and lower faces, powder boiling air-flow that the formation that replaces makes progress and downward negative pressure are inhaled the powder air-flow, finish the sieving actoion of each layer screen cloth to powder material.
2, according to the described power frequency airstream vibration of claim 1 screening plant, its characteristics are:
A, screen frame tube structure are the hermetically sealed cylindrical shells made from corrosion resistant plate, and its cross sectional shape can be circular, square or other shape, and the design is a ф 600mm circular cross-section; In order to keep in repair and easy for installationly cylindrical shell can be divided into four sections, every section with flange coupling and " O " shape sealing ring is housed prevents gas leakage;
The configuration of b, power frequency electromagnetic conversion airstream vibration generator, power source features, and power calculation: evenly dispose a plurality of electromagnetism airstream vibration generators (6) on screen frame cylindrical shell top around feed bin (4) underfeed pipe, the power supply of its use is industrial AC power frequency supply commonly used; The calculating of airstream vibration generator power is calculated as follows
Watt/centimetre
2, required oscillation power w 〉=0.02 watt/centimetre on the w-screen cloth unit are in the formula
2, the power summation of ∑ Wi---all airstream vibration generators, watt.Adopt six airstream vibration generators in apparatus of the present invention, each power is 10 watts, and general power is 60 watts, s
o---the single-deck screen web area, centimetre
2, s among the design
o=π 30
2=2827 centimetres
2, by formula W calculates,
Meet the following formula requirement;
C, the design and the allocation position of air-resilient resonance capsule (12), air-resilient resonance capsule (12), allocation position be in the annulus that the screen frame cylindrical shell of the orlop screen cloth bottom outside is set up, preparation uniformly has gas outlet a plurality of air-resilient resonance capsules outwardly, this configuration, can make the fine powder of decline can not enter the inwall of capsule, the fine powder of Xia Jianging repeatedly blocking simultaneously through screen frame cylinder lateral wall and lower hopper shape swash plate, the fine powder that has made decline adheres to and difficult problem of separating with bounce-back resonance capsule so can thoroughly solve fine powder away from bounce-back resonance capsule;
The design principle of air-resilient resonance capsule is to calculate by following formula:
The number of N-resonance capsule in the formula, S
O---the single-deck screen web area, centimetre
2S among the design
O=2827 centimetres
2, the surface area of the single bounce-back resonance of S-capsule, centimetre
2Among the design, S=352 centimetre
2, press
Formula Meter calculates N=8, so only need 8 or get final product more than 8 bounce-backs capsules that resonate;
The discharging opening structure of d, upper strata powder material warehouse, it is the structure that adopts Electromagnetic Control bell-jar inlet valve (5), the characteristics of this structure are to open downwards when electromagnet energising clock mask, and powder falls from feed bin (4) and realizes the auto feed action by the annular hollow joint of periphery, when the electromagnet no power, bell jar is pulled upwardly by spring, and with the sealing of the discharging opening of feed bin, when guaranteeing the sealing real work of whole screen frame cylindrical shell, automatically control by timer, can realize regularly feed;
E, powder disperse motor (13) and powder to disperse the effect of scraper plate (10); The one, the powder of heaping is dispersed in the screen cloth upper strata uniformly, the 2nd, in screening at the end with the meal on upper strata: push away to the discharging opening (11) of screen cloth periphery and to catch up with;
The structure of f, each layer discharge nozzle,
The entrance height of each layer discharge nozzle (11) is than the low 2mm of height of each layer screen cloth (8), and discharge nozzle adopts downward-sloping shape, realize sealing easily in order to make the discharging mouth of pipe, adopt the arc-shaped elastic steel plate structure, and, link to each other with magnetic valve (9) by hinge, can realize automatic control discharging regularly like this, in the time of not discharging, can guarantee each discharging opening again simultaneously, be in sealing state;
The discharge nozzle of g, orlop hopper docks with truck (16), in discharge nozzle, is provided with manual or electronic butterfly valve (15) to guarantee being in sealing state when the not discharging;
H, all electrical equipment control are to realize control automatically by single board computer.
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|---|---|---|---|
| CN 200410046354 CN1232359C (en) | 2004-06-07 | 2004-06-07 | Industrial continuous powder frequency steam vibrative screening mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410046354 CN1232359C (en) | 2004-06-07 | 2004-06-07 | Industrial continuous powder frequency steam vibrative screening mill |
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| CN1583291A true CN1583291A (en) | 2005-02-23 |
| CN1232359C CN1232359C (en) | 2005-12-21 |
Family
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|---|---|---|---|
| CN 200410046354 Expired - Fee Related CN1232359C (en) | 2004-06-07 | 2004-06-07 | Industrial continuous powder frequency steam vibrative screening mill |
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