WO2000024517A1 - Procede et dispositif de traitement d'une dispersion pulverulente, et dispositif de traitement de la poudre - Google Patents

Procede et dispositif de traitement d'une dispersion pulverulente, et dispositif de traitement de la poudre Download PDF

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Publication number
WO2000024517A1
WO2000024517A1 PCT/JP1999/005959 JP9905959W WO0024517A1 WO 2000024517 A1 WO2000024517 A1 WO 2000024517A1 JP 9905959 W JP9905959 W JP 9905959W WO 0024517 A1 WO0024517 A1 WO 0024517A1
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WIPO (PCT)
Prior art keywords
powder
flow
dispersed
gas
dispersion
Prior art date
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PCT/JP1999/005959
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English (en)
Japanese (ja)
Inventor
Koichi Fujibayasi
Mitsuru Matsui
Tsutomu Itoh
Original Assignee
Koichi Fujibayasi
Mitsuru Matsui
Tsutomu Itoh
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Application filed by Koichi Fujibayasi, Mitsuru Matsui, Tsutomu Itoh filed Critical Koichi Fujibayasi
Publication of WO2000024517A1 publication Critical patent/WO2000024517A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials

Definitions

  • the present invention is a bulk powder that is agglomerated and forms a cluster that is widely applied to pretreatment of processing such as classification, mixing, charging, weighing, and quantitative supply of powder.
  • a method for dispersing powder which is capable of effectively dispersing powder, is small and has a small energy consumption or consumes little gas for dispersing, and a dispersing apparatus, and the use of the same. It is intended to provide a powder processing apparatus with improved performance. Background art
  • bulk powder is usually obtained as a bulk having a required particle size according to the intended use, and is used as needed.
  • the bulk powder is not a simple aggregate of individual particles, and there are few individual particles. Clusters formed by aggregation of several tens of particles due to electrostatic force, etc. — often form bulk powder. Therefore, for example, when two kinds of cluster aggregates having different colors are mixed and mixed by dry mixing to perform toning, it is necessary to achieve uniform uniform mixing in a fine structure.
  • the cluster required for acceleration at the beginning of injection is smaller than that of individual particles.
  • the transport energy required after reaching a certain speed is also much higher. This means that when the powder is transported by air, the force that the powder receives from the carrier gas is proportional to the square of the particle size, while the weight of the particle is proportional to the cube of the particle size, which is smaller than the individual particles. Since the size of the cluster is always large, if the powder forms a cluster, the transport energy These are the forces that make the giants bigger.
  • unit operations such as supplying, classifying, mixing, and charging the powder have various disadvantages due to the fact that the powder forms a cluster, and the physical properties of the powder.
  • the measurement result is more dependent on the state of cluster formation than on the individual particles of the powder itself.
  • the powder is conveyed by a large amount of gas and collides with an object, or the powder is dispersed by a swirling flow in a pipe.
  • the particles are coarsened or adhered rather than due to melting and alteration caused by the collision of high-speed gas and the temperature rise due to friction with the pipe wall, and the powder is highly abrasive.
  • the range of application is significantly limited due to problems such as wear of the apparatus and an increase in the pressure and flow rate of the gas used for dispersion.
  • the problem to be solved by this invention is that the bulk powder mainly composed of the cluster is continuously crushed and dispersed in the cluster to supply the powder, Small, simple and dispersing gas, and thus low energy consumption, which feeds into dry unit operation processes of powders such as transport, mixing, classification, charging, weighing, etc. and effectively improves their efficiency and performance
  • Another object of the present invention is to realize a method and an apparatus for dry cluster crushing and dispersing pretreatment which have a wide application range without accelerating unnecessary or harmful powder. Also, by applying this, it is possible to realize a powder disintegration / dispersion processing device, a powder processing method and a device which are integrally configured with the unit operation of the powder.
  • the first means for achieving the object of the present invention is to make the powder flow that moves in a fixed direction with respect to the processing apparatus.
  • the powder flow is formed in any state such as powder and gas carrier powder.
  • the second means is to form a high-speed laminar gas shear layer jet that is faster than the powder flow intersecting with the powder flow, and the gas flow is usually a tube surrounding the powder flow.
  • the gas is blown from the flat gas jet from the pipe wall of the channel almost perpendicularly to the powder flow, and cross-collides in the powder flow to form a strong turbulent flow. It must be present at least once, over all sections.
  • the gas flow is blown out from the flat jet outlet to make it thinner, thereby reducing the proportion of the core gas flow that does not contribute to the dispersion of the powder inside the gas flow, increasing the speed, and increasing the speed on both surfaces.
  • a jet forming a shear layer whose tangential flow velocity changes abruptly.
  • the high-speed thin-layer gas shear layer jet applied to the dispersion of the powder cluster is blown from the flat inlet of the pipe wall of the conduit surrounding the powder flow.
  • the effect is high. Therefore, in some cases, the dispersion effect can be more effectively exerted by guiding the powder flow to the vicinity of the pipe wall having the inlet.
  • the powder must be dispersed, mixed, fed, transported, transported, charged, weighed, etc. This is to provide a dry unit operation, that is, to provide means for using dispersed powder.
  • the operation of the present invention is achieved by the first and second means in which the clusters of the powder are crushed and dispersed, and the powder is substantially refined.
  • the third means powder Efficiency of dry unit operation of .Applicability is improved, and the structure of the equipment is extremely simple, small and inexpensive, and it is applied because there is little dispersing gas or energy consumption and there is little needless acceleration.
  • the range is very wide and the benefits are very large. In other words, — the effect of finer particle size to take advantage of the physical properties of the powder can be realized with minimum time and energy.
  • the powder cluster is miniaturized by being crushed and dispersed, and the gas used for dispersion is mixed between the powder particles.
  • the individual separation of the powder particles is further advanced, the initial acceleration time in supply and transport by gas transport is shortened, and the constant transport speed after the end of acceleration is faster than in the cluster. In the end, the energy required for supply and transportation is saved.
  • the powder is fed into a classifier after the individual separation of the particles has progressed by the crushing and dispersion of the cluster, the classification efficiency can be improved, the classifier can be downsized, and the powder can be dispersed. The required power savings can be realized.
  • the powder cluster when the powder cluster is disintegrated and dispersed, and the powder is introduced into a charging device by contact charging (hereinafter abbreviated as a contact charging device), the powder inherently becomes powder.
  • a powder charging device using corona discharge hereinafter abbreviated as a corona charging device
  • the powder is dispersed by the cluster.
  • the charging efficiency is improved by increasing the chargeable surface area of the body, and the cluster is disintegrated and dispersed by the high-speed thin-layer gas shear layer jet.
  • the powdered powder is directed to a space with high electric current density where the electric field strength close to the This also improves the charging efficiency. The reason is that the final charge density per unit surface area of the powder is proportional to the electric field strength in the space where charging takes place.
  • a relatively low-speed powder is crushed and dispersed in a cluster with a constant flow rate of gas.
  • the cross-sectional area of the narrow channel is such that the powder is uniformly mixed in the narrow channel, and at the outlet of the narrow channel, the powder is substantially at the same speed as the gas flow.
  • the length of the pipe is set so that it accelerates, the kinetic energy of the gas is converted into the kinetic energy of the accelerated powder.
  • the pressure difference between the gas at the inlet and the outlet can be made to be proportional to the mass flow rate of the powder flowing through this conduit. Therefore, by automatically controlling the powder supply amount such that the pressure difference matches the required set value, a powder quantitative supply device can be realized, and the structure is extremely simple and inexpensive.
  • the powder does not stay inside and the inside is easy to clean, it is extremely useful as a powder flow rate measurement and quantitative supply means.
  • the most significant features of the quantitative supply device according to the present invention are that the powder supply amount is automatically controlled to a predetermined value and the powder is crushed and dispersed into individual particles at the outlet thereof. That is, the conditions are being achieved at the same time. Therefore, when the quantitative supply device according to the present invention is applied to the powder unit operation such as classification, mixing, and charging, the operation by the quantitative supply operation at the supply amount or the required supply amount at which the maximum processing capacity of the unit operation is obtained.
  • the stabilization of the unit, miniaturization of the equipment, and the synergistic effect of the powder being crushed and dispersed into individual particles have the effect of significantly improving the performance of each unit operation. Thus, the entire unit operation provided and thus improved in performance becomes the present invention.
  • FIG. 1 shows a vertical direction along a powder advancing direction of a dispersing apparatus according to an embodiment of a powder dispersing method, an apparatus, a powder dispersing apparatus, and a powder classifying apparatus to which the present invention is applied. It is a sectional view and a system diagram of a classification device.
  • FIG. 2 is a vertical sectional view of the powder dispersing means of FIG.
  • FIG. 3 is a system diagram of a powder mixing device constituted by the powder dispersion device according to the present invention.
  • FIG. 4 is a sectional view showing the structure of the contact charging device according to the present invention.
  • FIG. 5 is a sectional view showing the structure of the corona charging device according to the present invention.
  • FIG. 6 is a sectional view showing the structure of another corona charging device according to the present invention.
  • FIG. 7 is a diagram showing a structure and a system structure of an embodiment of a powder dispersion flow rate detecting means and a powder dispersion constant amount supply device to which the same are applied according to the present invention.
  • FIG. 8 is an example of a calibration curve showing the characteristics of the powder dispersion flow rate detecting means according to the present invention.
  • FIG. 9 is a diagram showing the structure and system configuration of another embodiment of the powder dispersion flow rate detecting means and the powder dispersion constant amount supply device to which the same are applied according to the present invention.
  • FIG. 10 is a partial explanatory view showing the structure of the powder flow forming means of still another embodiment of the powder dispersion flow rate detecting means and the powder dispersion quantitative supply device to which the present invention is applied.
  • FIG. 1 and 2 show an embodiment of the powder dispersion treatment apparatus according to the present invention.
  • Figure 1 shows FIG. 2 is a cross-sectional view taken along line BB in FIG.
  • Fig. 2 is a sectional view of the powder dispersing means 2 of Fig. 1 taken along the line A-A.
  • the powder is blown through a perforated plate 17 in a powder tank 15 and becomes a fluidized powder 16 by a liquefied gas 18 and a pipe 19 Then, it is supplied to the powder dispersing means 2 as a powder stream 4.
  • the dispersing gas 5 once enters the common flow path 14 of the powder dispersing means 2 and then flows through the plurality of flat flow paths 6 toward the powder flow 4 at the center.
  • the thin gas shear layer jet 7 is blown into the powder stream 4 from the flat jet port 8, and the strong shearing action separates the clusters contained in the powder stream 4 into individual particles. Disperse in.
  • FIG. 1 shows a case where the powder dispersing means is applied in two stages along the powder flow 4.
  • the dispersion gas 5 is given a set value 10 by the flow rate setting means 9, and the high-speed thin layer gas shear layer jet 7 is equalized by the fluid resistance of the flat channel 6.
  • the blowing speed of each jet 8 is always maintained at a predetermined value.
  • the high-speed laminar gas shear layer jet 7 exists over the entire cross section of the powder stream 4, so that the dispersing action must be performed over the details of the powder stream 4.
  • the thickness of the flat flow path 6 is generally about 0.1 to lmm, and since the gas flow is extremely thin, the core gas does not effectively act to disperse the powder inside the gas flow. Since the flow rate is small and the shearing is effectively performed on both sides of the gas stream, a large crushing and dispersing shear force is obtained for the cluster. Therefore, the blowing speed at each outlet 8 is often about 25 to 100 mZ seconds and does not need to be so high in many cases, and the required air amount is small.
  • the weight mixing ratio of the powder to the gas ⁇ Then, it is as small as about 20 to 10.
  • the mechanical structure is simple and there are no parts to wear, so The device can be made of non-adhesive materials such as polystyrene, and has no parts that require adjustment.It is a small device, so it can be used in parallel when large capacity is required. By applying multiple devices, it is possible to satisfy the requirements without sacrificing performance o
  • the powder dispersing means according to the present invention reduces the amount of the dispersing gas used as described above by using a high-speed thin-layer gas shear layer jet that intersects the powder flow. Therefore, the air content of the obtained dispersed powder 20 can be reduced, and the powder can be prevented from being unnecessarily accelerated. Therefore, when this is treated by the dispersed particle utilizing means 3, it is easy to increase the degree of freedom of the load, the specifications of the dispersed powder utilizing means 3 and the operating conditions.
  • the high performance, small size and low cost of the powder dispersion processing apparatus according to the present invention which is obtained by combining 1, the powder dispersion means 2, and the dispersed powder utilization means 3, are realized.
  • a cyclone or a rotary centrifugal classifier 22 is used as an example of a platform, and a large amount of classified air is usually used as a dispersion medium. 11 is introduced, and fine powder 21 is obtained through coarse powder 13 and fine powder separating means 12.
  • the powder entering the classifier 22 is dispersed by the powder dispersing means 2 into independent particles. Since the dispersing action, which is one of the two actions required for a normal classifier, dispersion and classification, is not required, the processing capacity of the classifier, particularly the efficiency of separating fine powder, is improved.
  • the amount of the dispersing gas 5 used in the powder dispersing means 3 is extremely small, the combined amount of the classifying air 11 introduced into the classifier 22 and the dispersing gas can be small, and the classification can be performed. Therefore, the inner diameter of the classifier required to obtain the required centrifugal force generated by the separation can be reduced, and the size of the classifier can be reduced.
  • the valve 23 is an example of a flow rate adjusting means for the powder stream 4, and the fluidizing gas 18 is supplied at a constant flow rate. It shows a manner in which the internal pressure of the powder tank 15 is adjusted by adjusting 23 and thereby the flow rate of the powder stream 4 is maintained at a predetermined value.
  • the means for adjusting the flow rate of the powder flow 4 is to suction an ejector (not shown) downstream of the powder dispersing means 2 in Figs. 1 and 2. This can be done by providing a means.
  • the feeder for powder tanks is suitable for supplying bulk powder mainly as a screw feeder, mouth feeder, vibratory feeder, etc.
  • the apparatus can carry out the formation of the powder stream 4, in which case the powder stream 4 is limited to the fluidized, aerated powder stream shown in Figure 1.
  • the embodiment of the present invention includes a case where the bulk powder is supplied as it is as a powder stream.
  • FIG. 3 shows an embodiment of the mixing apparatus according to the present invention, in which the powder 16-1 in the powder tank 15-1 and the powder 16-5 in the powder tank 15-2 are shown.
  • the dispersion means 2-1 and 2-2 according to the present invention shown in Fig. 1 and Fig. 2 are applied, and the dispersion gas 5-1 and 5-2 Dispersed powder 21 to 21 and 20 to 2 are obtained by dispersing the raster into individual particles, and this is sent to the mixer 25.
  • the powder entering the mixer has a dispersing action and a mixing action which constitute the mixing process of the conventional mixer.
  • the mixing action of one of the two actions has been completed, and it is suspended in a small amount of each dispersing gas, the mixing action is extremely easy and can be completed in a short time.
  • the gas for dispersion contained in the mixed powder may be exhausted as shown by the arrow 27 in order to separate the gas used for dispersion 5-1 and 5-2 as necessary. is there.
  • FIG. 4 shows an embodiment of the contact charging device for powder according to the present invention.
  • the components of the powder dispersing means 2 are given the same reference numerals as those in FIGS.
  • the cluster of the powder stream 4 is solved by a high-speed thin-layer gas shear layer jet 7 blown from the pipe wall of the powder dispersing means 2 through a flat channel 6.
  • the powder is crushed and dispersed to form a single-particle-dispersed powder 20, and the powder has the original maximum surface area and number of particles.
  • the powder particles in the contact charging device 28 by passing through the multi-stage expanding / contracting circular path 36 formed between the outer pipe 34 and the inner pipe 35 in the downstream state are transferred to the inner pipe 35 and the outer pipe.
  • the number of times of contact with 3 4 becomes the maximum, and as a result, the total of the surface area of the powder that holds the charge acquired by the powder becomes the maximum, and, eventually, the charge of the charged powder 3 7
  • the amount of gas required to transport the powder to the charged part as shown in 34, 35, and 36 in Fig. 4 is required by the charging part.
  • the required amount of air is blown in the axial direction or as a swirling flow of the accelerating unit immediately before the charging unit, because it is often about half the amount of air to be supplied.
  • these conventional methods have little effect on cluster disintegration and dispersion of powder.
  • the added air immediately before the charged portion is dispersed into individual powders by cross-shearing the powder stream 4 as a high-speed thin layer gas shear layer jet from the immediately preceding inner wall,
  • the powder dispersing means 2 and the charging unit 34 although different depending on the electrostatic engineering physical properties of the powder used, the material of the transfer pipe, the transfer speed, etc. It is preferable that the connecting conduit 38 between 35 and 36 is as short as possible. If the conduit 38 is long, the powder particles once dispersed may recombine due to static electricity or the like, and the effect of the powder dispersing means 2 may be reduced.
  • the charging section applied to the contact charging device for powder according to the present invention is composed of an outer pipe 34 and an inner pipe 35 made of a material having a high charging capability for the target powder and having no adhesion.
  • the multi-stage expansion / contraction ring system formed between them is shown.
  • applicable charging units are not limited to this method, and various types of charging units such as well-known narrow pipes and swirling circular pipes can be used.
  • FIG. 5 shows an embodiment of the powder corona discharge device according to the present invention.
  • the components of the powder dispersing means 2 are given the same reference numerals as in FIGS. 1 and 2. .
  • a powder stream 4 conveyed by gas is generated by a high-speed thin-layer gas shear layer jet 7 blown from the pipe wall of the powder dispersing means 2 through a flat flow path 6.
  • the dispersed powder 20 thus generated has a corona discharge electrode 31 to which a high voltage is applied by a high-voltage power supply 32 at a point provided downstream thereof.
  • a corona charging device 29 composed of an orifice 30 discharges the charged powder 37 by corona discharge.
  • the dispersed powder 20 dispersed to single particles reaching the charging means such as the deflector cone 30 is in the highest atomization state.
  • the specific charge QZm of the obtained charged powder 37 is remarkably improved as compared with the case where the powder dispersion means 2 is not provided.
  • the connecting line 38 between the powder dispersing means 2 and the corona charging device 29 is desirably as short as possible; This is because it differs depending on the type, the amount of air to be conveyed, the speed of conveyance, and the like, and the clusters may be formed by recombination due to static electricity or the like of the powder once dispersed.
  • the powder containing a large amount of cluster to which the dispersing device 2 according to the present invention is not applied has a large bulk specific gravity, and a discharge pattern obtained by a conveying means such as a cone 30. This makes it difficult to spread, making it difficult to obtain a well-charged charged powder having a large specific charge Q / m.
  • FIG. 6 shows another embodiment of the powder corona discharge device according to the present invention.
  • the components of the powder dispersing means 2 are given the same reference numerals as those in FIGS. It is.
  • a powder stream 4 conveyed by gas is supplied from a pipe wall of the powder dispersing means 2 by a high-speed thin layer gas shear layer jet 7 which is blown through a flat channel 6.
  • the cluster is disintegrated and dispersed.
  • the powder stream 4 is brought close to the pipe 19 by the deflector cone 30 or formed into a ring shape, and is sent to the outlet 8 of the high-speed thin-layer gas shear layer jet 7. As they pass close to each other, the clusters are more disintegrated and dispersed.
  • the corona discharge electrode 31 for corona discharge is located at the center of the ejection port 8, the dispersed powder is blown toward the electrode, and the charge of the powder is reduced. It occurs near the tip of the electrode where the corona discharge electric field is strongest. Since the maximum charge density achieved by ion collisions due to corona discharge in an electric field is proportional to the electric field strength, in the embodiment shown in FIG. Induced near the flat jet outlet 8 Both effects of the body guidance means, that is, the function of the deflector cone 30 and the effect that the dispersed powder 20 is blown to the vicinity of the needle electrode of corona discharge and charged by a strong electric field are performed. Thus, the specific charge Q / m of the charged powder ejected from the nozzle 33 can be increased.o
  • the deflector cone 30 in Fig. 6 is a cluster by directing the powder stream 4 near the flat jet 8 of the high-speed thin-layer gas shear jet 7. In many cases, it is effective for the disintegration and dispersing of powder.In the embodiments shown in Figs. 1, 2, 3, 4, 5, etc., the concentric If it is effective and the material balance of powder and gas is possible, the swirling flow of gas may be used alone or in combination with a deflector for the same purpose.
  • FIG. 7 shows an embodiment of the powder flow rate measuring device and the powder quantitative supply device using the same according to the present invention.
  • the components of the powder dispersing means 2 are shown in FIGS. Common numbers are given.
  • the fluidized powder stream 4 has its cluster broken up and dispersed by the powder dispersing means 2 and passes through a short connecting pipe 38 which is as short as the pipe 19, The gas flows through the thin tube 39 to the outlet side connection line 38, and the pressure difference between the gas at the inlet and the outlet of the thin tube 39 is detected by the differential pressure sensor 40.
  • the cross-sectional area ratio between the connecting pipe 38 and the thin pipe 39 immediately after the powder dispersing means 2 is determined by changing the ratio of the powder velocity in the connecting pipe 38 to the dispersion gas in the thin pipe 39. If the speed of 5 is increased by about 5 times or more, the powder 4 is rapidly accelerated in the capillary channel 39, and due to the work required, the gas 4 at the inlet and outlet of the capillary 39 is increased. A pressure difference is generated at At this time, the powder 4 is disintegrated and dispersed into individual particles by the dispersing means 2 and is in a state in which it is most easily accelerated.
  • the velocity of the gas and the powder at the outlet of the fine tube 39 is almost the same when the length of the fine tube 39 is about several tens of millimeters.
  • the dispersion gas 5 is set by the flow rate setting means 9.
  • the output of the differential pressure sensor 40 can be used as the powder mass flow signal 54 by means such as passing through.
  • the pressure difference between the gas containing powder around the thin tube 39 is detected using a semiconductor film type differential pressure sensor with a small content 3 ⁇ 4 and non-adhesive ultra-fine particles that allow gas molecules to pass through without passing through liquids or solids. This can be implemented semipermanently by using the porous membrane as the pressure-permeable means 64.
  • 6 1 is a display means.
  • the difference between the powder mass flow signal 54 and the setting signal of the setting device 41 is fed back to the control valve 43 via the controller 42.
  • the mass flow rate of the powder passing through the thin tube 39 can be maintained at a set value, and the powder can be dispersed at a constant flow rate. 2 can be realized.
  • the difference between the powder and the gas at the outlet of the thin tube 39 becomes almost equal when the powder becomes almost equal.
  • This utilizes a phenomenon in which a stable proportional relationship is obtained between the output of the pressure sensor 40 and the mass flow rate of the powder.
  • the most basic condition for realizing this phenomenon is that the powder cluster is crushed and dispersed into individual particles. The reason is that usually in the case of dry powders, especially high resistance powders of 100 / or less, the powders form a considerable proportion of clusters. If the powder forms a cluster, its acceleration will be severely hindered, and the size and proportion of the cluster in the powder will be manufactured under high quality control.
  • the length of the capillaries 39 and the flow rate of the dispersing gas 5 are preferably such that at the outlet of the capillaries 39 the powder and gas flow rates are preferably equal; high quality control and stability
  • the powder and the gas do not necessarily have to be at the same velocity, and the powder can be obtained by creating a calibration curve. It can be used as a body flow measurement device, which can obtain stable acceleration conditions by dispersing the powder into individual particles, and in many cases, is not practically a problem. In other words, the powder flow rate can be used as a means for quantitative supply.
  • the powder flow 4 supplied to the powder dispersing means 2 is
  • the force supplied in a fluidized state by means of 15; the means for forming the powder stream are not limited to this. In addition, it is possible to perform the force shown in the example where the thin tube 39 is horizontal and other conditions.
  • the supply rate is controlled by adjusting the internal pressure of the powder tank by the control valve 43.
  • FIG. 9 shows another embodiment of the powder flow rate measuring device according to the present invention and the powder quantitative supply device using the same, wherein the components such as the powder dispersing means 2 are shown in FIGS. The same numbers as in Fig. 2 are assigned.
  • the bulk powder 16 passes through a suction pipe 56 in the powder tank 15 and becomes a powder flow 4 by the negative pressure of the control means 55.
  • the powder tank 15 is vibrated by the vibrating means 58 during the operation of the control means 55, whereby the powder including the powder in the suction pipe line 56 is produced. 16 Improve the liquidity.
  • the vibrating support means 59 effectively vibrates the powder tank 15 by the vibrating means 58, and at the same time acts as vibration isolation.
  • the powder stream 4 is dispersed by powder dispersing means 2 into clusters, which are disintegrated and dispersed into individual particles and passed through a vertical thin tube 39.
  • the gas is accelerated by the dispersing gas 5 at a constant flow rate by the setting means 10, and at the outlet of the thin tube 39, the narrow gas passage 39 is set so that the dispersing gas 5 and the powder have the same speed.
  • the output of the differential pressure sensor 40 is compared with the output of the setting device 41, and the controller 42 controls the output of the differential pressure sensor 40 via the control valve 43 so that the difference becomes zero.
  • the control source 55 of the control source pressure 60 is feed-back controlled.
  • the control means 55 for example, specifically, an electronic device or the like is applied, whereby the dispersed constant flow rate powder 52 can be obtained.
  • the capillary 39 is vertical, and uniform acceleration can be achieved with less dispersing gas 5 compared to the horizontal capillary 39 of FIG.
  • the vertical wicking method shown in FIG. 9 can be applied to the fluidized powder tank 15 shown in FIG.
  • Fig. 10 shows a powder tank 15 of the type shown in Fig. 9, which was placed on a platform where the powder could not be sucked up smoothly due to poor fluidity of the powder.
  • a partial fluidizing means 57 is separated below the lower end of the suction pipe 56, and the powder on the upper part is partially fluidized by the fluidizing gas 18 and Is sucked up as a fluidized powder stream 4.
  • most of the powder 16 is in a bulk state and is collectively supplied to the bottom of the powder tank by the vibration of the vibrating means 58.
  • the remarkable features of the powder flow rate measuring device and the powder quantitative supply device according to the present invention shown in FIGS. 7, 8, 9, and 10 are that the amount of powder supplied in conformity with the required set value is This means that it can be obtained in a state of being dispersed among the components, and the structure of the device is extremely simple, with no moving parts and easy to clean.
  • each unit operation usually has a required powder supply amount. It is. Therefore, in many cases, the embodiment of the present invention in which the powder dispersing means shown in FIGS.
  • the dispersed powder utilizing means 3 in the present invention is a powder quantitative supply device for controlling the output of the accelerated differential pressure conversion powder flow measuring device 63 of the dispersed powder 20. It can be said that it has a structure that includes the feeding means as the first stage.
  • the flat flow path 6 of the powder dispersing means 2 opens at right angles to the powder flow 4.
  • by making the flat flow path 6 form an obtuse angle of about 120 ° or less with respect to the traveling direction of the powder flow 4 a slight edge is formed with respect to the thin tube 39. In some cases, this has the effect of providing a star effect, which can provide benefits such as the ability to cancel the pressure drop of the dispersing gas 5 in the thin tube 39 when the powder supply amount is zero.
  • benefits such as the ability to cancel the pressure drop of the dispersing gas 5 in the thin tube 39 when the powder supply amount is zero.
  • the flat flow path 6 of the powder dispersing means 2 usually has both ends of the adjacent flat flow path opening to the powder flow 4 being in contact with each other.
  • it is suitable for large-capacity long-term continuous operation.
  • this is not always the case when the flow rate of the powder flow 4 is small, and radial pores symmetrical to the central axis of the powder flow 4 can also be applied.
  • the powder cluster is crushed by a flat flow path 6 in which the common flow path 14 of the powder dispersion means 2 in FIG. 1 communicates with the powder flow 4 all around.
  • the small dry powder which forms a class is disintegrated and disperse
  • a high-performance powder dispersion treatment method and apparatus capable of performing the above.
  • this device into unit operations such as classification, mixing, and charging, the performance of those unit operations can be significantly improved, and new high-performance unit operations can be realized.
  • the flow rate detection means can be obtained.
  • This powder flow rate detection means has a compact structure and is easy to use. It is remarkable in that it is inexpensive and inexpensive.
  • the individual particle powder obtained by crushing and dispersing the cluster can be obtained.
  • a fixed-quantity feeding device can be obtained.
  • unit operations such as classification, mixing, and electrification generally require a platform and a quantitative powder supply function.
  • the powder dispersion / quantity supply means that combines the powder dispersion treatment function and the quantitative supply function according to the present invention is applied in such a case to improve the performance of each unit operation, to reduce the size, and to facilitate the use. Significant effects such as improvement and price reduction can be obtained.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

L'invention concerne un dispositif de pré-traitement peu coûteux, de fabrication simple et de petite taille, ainsi que le procédé correspondant, permettant de désintégrer et de disperser efficacement une poudre sèche en vrac, se présentant sensiblement sous la forme d'un agrégat, notamment une poudre plastique à haute résistivité électrique ou une poudre céramique fine d'une granulométrie de l'ordre de quelques dizaines de microns tout au plus, de manière à former des particules individuelles par utilisation d'une faible quantité de gaz, ce qui rend les opérations ultérieures au niveau de l'unité de traitement de la poudre très efficaces, à savoir la classification, le mélange, la charge électrique, la pesée et l'alimentation à débit constant. En outre, les opérations au niveau de cette unité, très efficace et de petite taille, sont assurées par un dispositif capable de réaliser l'exécution combinée de la désintégration et de la dispersion de l'agrégat, et de l'alimentation à débit constant en une seule fois. En outre, la poudre est entraînée dans un écoulement (4) pulvérulent s'écoulant dans un pipe-line (19). A cet effet, un orifice (8) de sortie par jet d'un passage (6) d'écoulement plat est pratiqué dans la paroi du pipe-line, lequel orifice forme un jet (7) multicouche haute vitesse à minces couches d'air de cisaillement, qui traverse l'écoulement (4) pulvérulent et entre en collision avec cet écoulement pulvérulent de manière à produire un écoulement turbulent puissant, appliquant une forte action de cisaillement sur l'agrégat de poudre, désintégrant et dispersant ainsi l'agrégat de poudre en vue de son introduction dans l'unité de traitement suivante, ce qui permet un fonctionnement très efficace de l'unité et de l'unité de l'étape suivante.
PCT/JP1999/005959 1998-10-28 1999-10-28 Procede et dispositif de traitement d'une dispersion pulverulente, et dispositif de traitement de la poudre WO2000024517A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10/307335 1998-10-28
JP10307335A JP2000126568A (ja) 1998-10-28 1998-10-28 粉体分散処理方法とその装置及び粉体処理装置

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WO2000024517A1 true WO2000024517A1 (fr) 2000-05-04

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WO (1) WO2000024517A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113564753A (zh) * 2021-07-05 2021-10-29 浙江大学 一种基于气流冲击和静电的纤维分散收集装置及方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009247999A (ja) * 2008-04-07 2009-10-29 Nisshin Engineering Co Ltd 混合装置
JP2011110512A (ja) * 2009-11-27 2011-06-09 Ricoh Co Ltd 粉体分散装置、分級装置及び分級方法、並びにトナー製造方法
JP7427919B2 (ja) * 2019-11-08 2024-02-06 大同特殊鋼株式会社 粉末材料の製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62210066A (ja) * 1986-03-10 1987-09-16 Hideo Nagasaka 粉体荷電装置および静電粉体塗着装置
JPH03217258A (ja) * 1990-01-22 1991-09-25 Kiyoyuki Horii 粉体の分級と複合材の製造方法
JPH08323250A (ja) * 1995-06-01 1996-12-10 Ikuo Tochisawa 粒子の荷電方法及び荷電装置
JPH1096657A (ja) * 1996-09-24 1998-04-14 R I D Kk 粉体質量流量測定装置、およびこれを適用した静電粉体塗装装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62210066A (ja) * 1986-03-10 1987-09-16 Hideo Nagasaka 粉体荷電装置および静電粉体塗着装置
JPH03217258A (ja) * 1990-01-22 1991-09-25 Kiyoyuki Horii 粉体の分級と複合材の製造方法
JPH08323250A (ja) * 1995-06-01 1996-12-10 Ikuo Tochisawa 粒子の荷電方法及び荷電装置
JPH1096657A (ja) * 1996-09-24 1998-04-14 R I D Kk 粉体質量流量測定装置、およびこれを適用した静電粉体塗装装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113564753A (zh) * 2021-07-05 2021-10-29 浙江大学 一种基于气流冲击和静电的纤维分散收集装置及方法

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