EP0451048B1 - Verfahren und Vorrichtung zur Trocknung und Entgasung von Pulver - Google Patents

Verfahren und Vorrichtung zur Trocknung und Entgasung von Pulver Download PDF

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Publication number
EP0451048B1
EP0451048B1 EP91400894A EP91400894A EP0451048B1 EP 0451048 B1 EP0451048 B1 EP 0451048B1 EP 91400894 A EP91400894 A EP 91400894A EP 91400894 A EP91400894 A EP 91400894A EP 0451048 B1 EP0451048 B1 EP 0451048B1
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EP
European Patent Office
Prior art keywords
riffler
powder
compartment
hourglass
vessel
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 - Lifetime
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EP91400894A
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English (en)
French (fr)
Other versions
EP0451048A1 (de
Inventor
Jean-Claude Baudin
Dominique Le Potier
Jean-Claude Couterne
Philippe Jacquin
Jean-Paul Levaillant
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Commissariat a lEnergie Atomique CEA
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Publication of EP0451048A1 publication Critical patent/EP0451048A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/049—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with provisions for working under increased or reduced pressure, with or without heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/40—Parts or components, e.g. receptacles, feeding or discharging means
    • B01F29/401—Receptacles, e.g. provided with liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/40—Parts or components, e.g. receptacles, feeding or discharging means
    • B01F29/401—Receptacles, e.g. provided with liners
    • B01F29/402—Receptacles, e.g. provided with liners characterised by the relative disposition or configuration of the interior of the receptacles
    • B01F29/4021—Multi-compartment receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/40—Parts or components, e.g. receptacles, feeding or discharging means
    • B01F29/401—Receptacles, e.g. provided with liners
    • B01F29/402—Receptacles, e.g. provided with liners characterised by the relative disposition or configuration of the interior of the receptacles
    • B01F29/4022—Configuration of the interior
    • B01F29/40222—Configuration of the interior provided with guide tubes on the wall or the bottom
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/026—Arrangements for charging or discharging the materials to be dried, e.g. discharging by reversing drum rotation, using spiral-type inserts

Definitions

  • the field of the invention is that of drying and degassing of ceramic or metallic powders. These operations are implemented as part of the production of massive parts produced by hot isostatic pressing.
  • the consolidation of powders must use a material free of moisture and residual gases.
  • the latter can either react with the product to be compacted (reaction with H2O for example), or cause gaseous inclusions disturbing the properties of the solid obtained (density, weldability, ductility).
  • a first existing solution consists in degassing the powder statically.
  • the mass of powder is in this case subjected to vacuum and temperature in its sheath. With this process there is great difficulty in obtaining and guaranteeing a sufficient level of vacuum within the mass of powder.
  • Another drawback lies in the fact that the gaseous products extracted from the lower layers are redeposited on the upper layers, which have become more reactive. Finally, there is a risk of triggering natural sintering phenomena.
  • a second solution consists in mechanically brewing the powders (see, for example, document US-A-3,599,709). This mixing causes on the one hand pollution problems due to abrasion and on the other hand a technological limitation concerning the maximum temperature and the level of vacuum used.
  • the object of the invention is to remedy the drawbacks of the above methods and to propose both a method and an installation for drying and degassing powders.
  • the mixing of the powder is carried out by a slow inversion of the hourglass in a first direction, to gradually pass the powder from one compartment to another, then by slowly turning the hourglass in a second direction opposite to the first direction to return the powder to the first compartment.
  • This phase makes it possible to separate the grains of powder from each other during the passage through the baffle.
  • the mixing and the passage of the powder from one compartment to the other can be improved by means of at least one series of oscillations around its horizontal axis during the turning cycle.
  • the heating means are heating plates placed outside the compartments and the baffle.
  • the means for rotating the hourglass consist of a geared motor communicating a slow rotation movement to a first sleeve of a movable coupling with radial freedom, a second sleeve being integral with a rotation drive shaft hourglass.
  • the hourglass is mounted to rotate freely on a mobile carriage by means of rollers on which it is placed by means of treads.
  • rollers are mounted on articulated boogies arranged two by two.
  • the enclosure comprises inclined supports on which come to rest, during the horizontal translation of the mobile assembly, second rollers mounted free in rotation on a base plate placed below the hourglass so that the hourglass is supported on the enclosure, when it is inside of it.
  • the main concept of the process according to the invention consists in putting the powder under vacuum, in brewing it slowly while raising its temperature (for example up to 600 ° C., maximum value on the operational installation).
  • a drying and degassing device is used, marked 10 in all the figures and more commonly called an hourglass. It consists of a wall 19 of very special shape terminated at its ends by a flange.
  • the hourglass 10 is placed in an enclosure inside which a vacuum is produced up to 10 ⁇ 6T (1.333.10 ⁇ 4 Pa).
  • the hourglass is raised to a temperature that can exceed 700 ° C. Brewing takes place under these temperature and pressure conditions.
  • the powder temperature is followed by immersion thermocouples in compartments 4 and 8.
  • FIG 1A shows in section the hourglass in its powder loading position.
  • the latter is not identified by a numerical reference in the figures, but is shown diagrammatically by one or more spots of small dots.
  • the hourglass entrance, formed by the first end of a loading and unloading duct 2 is located, in this position, above the body of the hourglass 10, that is to say in the highest position that it can take, during a complete rotation of the hourglass 10.
  • This position is used to channel the powder, intended to be treated, inside the hourglass 10.
  • the powder falls by gravity along the loading and unloading pipe 2 to arrive in a first compartment 4 which communicates with the loading and unloading pipe 2 through its second end.
  • the hourglass 10 has a second compartment 8 connected to the first compartment 4 via a baffle 6.
  • the relative positions of the two compartments 4 and 8 and their communication with the baffle 6 must be such that, in the loading position shown in FIG. 1A, the powder remains on an internal wall 16 of the first compartment 4 without being able to progress towards the second compartment 8.
  • the outer walls of the two compartments 4 and 8 and of the baffle 6 are partially covered by heating means 12, which are preferably hot plates.
  • heating means 12 which are preferably hot plates.
  • the hourglass 10 is rotated in a first direction, symbolized by the arrow in FIG. 1B.
  • this rotation is of the order of a quarter turn.
  • the first compartment 4 is located above the second compartment 8 and the powder falls naturally by gravity into the baffle 6 and into the second compartment 8.
  • a deflector 14 is located at the entrance to the baffle 6. Its function is to prevent the powder from returning directly to the conduit of loading and unloading 2, when it is desired to drop it into the second compartment 8. In these figures, this deflector 14 constitutes the extension of one of the two walls of the loading and unloading duct 2.
  • the baffle 6 mainly consists of two segments of straight tubes communicating with one another at an acute angle.
  • the baffle 6 communicates with the two compartments 4 and 8, being oriented so as to form, with the internal walls 16 and 18 constituting the respective bottoms of the two compartments 4 and 8, an acute angle.
  • the powder in the first compartment 4 must pass three abrupt changes of direction before falling into the bottom of the second compartment 8.
  • This embodiment is only an example, any other form of baffle can be used from the instant that the desired mixing is obtained.
  • the hourglass 10 is driven by several slow successive and reverse rotations. As a result, the hourglass is slowly shaken and the powder gradually descends to the bottom of the second compartment 8 where it is stirred.
  • the cycle continues with an inverted reversal of the hourglass 10.
  • the arrow in this figure 1C indicates a direction reversed with respect to the direction symbolized by the arrow in FIG. 1B.
  • the cycle preferably comprises a phase of agitation similar to that taking place when the second compartment 8 is at the bottom. This agitation with the first compartment 4 placed at the bottom is however generally of greater amplitude. It is indeed necessary to ensure the complete descent of all the powder located in the baffle 6 and in the second compartment 8.
  • the number of transfers between cavities 4 and 8, as well as the oscillation cycles are a function of certain parameters.
  • FIG. 2 shows in longitudinal section, the assembly of a drying and degassing installation according to the invention.
  • the latter mainly comprises the assembly consisting of the oven itself, that is to say the vacuum chamber 20 and the hourglass 10, equipped with its means of rotation which are located to its right.
  • This assembly is mounted integrally on a carriage 16 movable in horizontal translation relative to the ground 18.
  • the translation system by mother screw is not shown here.
  • the installation further comprises an enclosure 20 fixed relative to the ground 18 and inside which the hourglass 10 is housed so that the drying and degassing operations are carried out there.
  • This enclosure 20 is completed with a removable door 30, fitted with a seal 31, mounted on the assembly of the hourglass 10 and of the movable support 16.
  • the enclosure 20 is also completed with a first depression orifice preferably in the form of a plug 44 attached to the walls of the enclosure 20, and of an outlet receptacle 52 for the powder, placed in the lower part of the enclosure 20 and opening into a vacuum valve 54.
  • the hourglass 10 is loaded with powder when it is placed outside the enclosure. Once this loading has been carried out, the hourglass is introduced inside the enclosure 20 which is hermetically closed using the watertight door 30. The latter is mounted fixed relative to the mobile support 16. The vacuum is then done inside the enclosure using at least one vacuum circuit symbolized by the plug 44 placed in the upper part of the enclosure 20. In fact, it is preferable to use a first primary circuit to start slowly creating a vacuum in the enclosure without sucking the powder placed in the hourglass 10. A second secondary circuit is then used to obtain the desired vacuum more quickly.
  • the hourglass 10 and its rotational drive means are mounted movable in translation on the carriage 16 to allow the maintenance of the hourglass 10 without mounting or dismounting thereof, and the loading of the powder therein.
  • the drying and degassing method according to the invention can be implemented with an installation in which a loading hole would be provided in the top of the enclosure and in which the hourglass would remain inside the enclosure .
  • Such an installation would make it possible to eliminate the mobile carriage 16, the door 30 and its sealing system and the system for positioning the hourglass inside the enclosure.
  • such an installation would therefore require an additional loading opening provided in the upper part of the enclosure and to review the operations necessary for maintenance.
  • the means for driving the hourglass 10 in rotation consist of a geared motor 22 fixed on the movable carriage 16. It drives a drive shaft 26 of the hourglass 10, by means of a transmission assembly symbolized in broken lines by a belt 24.
  • the latter drives in rotation the transmission shaft 26 by means of a movable coupling with radial freedom 25 which is preferably an OLDHAM seal.
  • a movable coupling with radial freedom 25 which is preferably an OLDHAM seal.
  • the belt 24 drives a first sleeve of this OLDHAM joint, the second sleeve of this joint being integral with the drive shaft 26.
  • the drive shaft 26 is preferably hollow. This allows the passage of the feed connection of the heating plates 12 of the hourglass 10 and of possible control thermocouples also located on the hourglass 10. This drive shaft 26 passes through the door 30. The sealing is then ensured by a passage tight turn 27 placed around the drive shaft 26.
  • FIG. 2 the mobile assembly of the hourglass 10 and the mobile carriage 16 is shown in the intermediate position, that is to say that the hourglass 10 is half out of the enclosure 20. In the loading position of the powder, this assembly is completely removed from the enclosure 20.
  • the hourglass 10 is then mounted in cantilever on the mobile carriage 16. Specifically, it is suspended by means of a journal 34 placed in at least one notch 36 secured to door 30. This pin 34 is integral with the hourglass 10 and is placed at the height of the upper wall of the apron 10, next to the right flange 46 of the hourglass 10.
  • the whole hourglass 10 also rests on the door 30 by lower supports 38.
  • the movable assembly is then translated to the left of the figure, until the hourglass 10 takes the position sketched in dashed lines, the door 30 being applied against the right end of the tank 20.
  • the latter is therefore closed hermetically thanks to the seal 31 placed on the door 30 and bearing on the face of the tank 20.
  • the hourglass 10 resting in the tank 20 includes inclined supports 48 fixed on its bottom and positioned in correspondence with positioning rollers 50 fixed below the hourglass 10, on a base plate 60, but free to rotate around horizontal axes and thus acting as rollers.
  • each positioning roller 50 comes to tangent and roll on an inclined support 48.
  • the hourglass 10 is then slightly raised.
  • the translation of the mobile assembly ends with the arrival of the positioning rollers 50 on a horizontal portion of the inclined supports 48 corresponding to the working position of the hourglass 10. The latter is then unhooked from the fixing hook 36 and n ' is no longer supported by door 30.
  • the degree of freedom in horizontal rotation of the hourglass 10 is ensured by the fact that the latter is placed on rollers 40 placed outside the flanges 46 of the hourglass 10.
  • the left half of Figure 3 is a vertical section of Figure 2 at the line AA.
  • the rollers 40 are grouped two by two by means of articulated arms 56 thus forming boogies.
  • Each boogie is articulated around a horizontal axis of articulation 58 secured to the base plate 60 of the hourglass 10.
  • the hourglass 10 On the outside of each of the flanges 46 (FIG. 2), the hourglass 10 has a tread 42. Each of them is placed on at least two boogies of rolling rollers 40 placed in correspondence below them, so that the hourglass 10 can rotate freely around its horizontal axis because it rests only on rollers 40.
  • FIG. 3 In Figure 3 is shown the cap 44 symbolizing the means of depression of the enclosure 20.
  • a water inlet 62 is also shown on the top of the enclosure 20. It is intended for the circulation of water between the two walls of the enclosure 20. The presence of the double wall of the enclosure 20 allows permanent circulation of water around the hourglass 10 to maintain a safety temperature on the exterior surface of the enclosure 20.
  • This type of mounting of the hourglass 10 on rolling rollers 54 makes it possible to limit the contact pressures and to allow a slight vertical elevation of the axis of the hourglass 10 without inducing constraints.
  • the elevation is due to a variation in bearing diameter on the rollers 40 caused by thermal expansion.
  • the axes and the rollers 40 are preferably made of refractory metals and ceramics to ensure operation in an environment which does not allow lubrication of the contacts.
  • the first operation consists in placing the powder in the hourglass 10, then in introducing the hourglass into the enclosure 20. This operation is followed by the evacuation of the interior of the enclosure 20. The powder is then stirred slowly at the interior of the hourglass 10 according to a determined cycle of turning the hourglass, an example of which is given below.
  • This brewing cycle varies in very large proportions. The heating of the powder can be incremented in stages or carried out by a continuous rise in temperature. After the brewing cycle, the powder is cooled naturally. Finally, it is evacuated from the hourglass while being kept under vacuum for storage in a hopper.
  • the volume of powder used is preferably of the order of six liters.
  • FIG. 4 An example of the powder brewing cycle is shown diagrammatically in FIG. 4.
  • the 0 ° mark corresponds to the loading position of the hourglass.
  • the first clockwise rotation of the hourglass exceeds 110 °.
  • the hourglass 10 then undergoes a determined number of slow oscillations of increasing amplitude, in some cases reaching 90 °.
  • the hourglass 10 is then turned 180 ° and is again subjected to oscillations of greater amplitudes which can exceed 90 ° and during which the powder is transferred from the cavities 4 to 8 and vice versa.
  • the different rotations of the hourglass are symbolized by arrows in the shape of an arc of a circle.
  • the circled numbers assigned to these arrows are representative of the chronology of these rotations.
  • FIG. 5 the installation is used in a degassing and envelope filling assembly for hot isostatic compaction.
  • two installations have been shown schematically.
  • the one on the right shows a first hourglass 10 enclosed in an enclosure 20.
  • This first installation diagrams a degassing operation.
  • the installation on the left shows a second hourglass 10 in a loading position.
  • This second hourglass 10 is taken out of the enclosure 20.
  • the assembly is placed in a confinement enclosure 70 to allow the various operations to be carried out under a special atmosphere, or to avoid contamination problems.
  • each enclosure 20 Below each enclosure 20, an outlet receptacle 52 is placed to collect the treated powder. This receptacle 52 results in a vacuum valve 54. The latter is suitable for transferring the powder. Downstream of each vacuum valve 54 is a hopper 56, the capacity of which corresponds to that of the hourglasses 10. Each hopper 56 is followed by a conveying device allowing the powder to be transferred to a zone of use. Thanks to the vacuum valve 54, the downstream assembly is maintained in a controlled atmosphere, and more specifically under vacuum, while the enclosure 20 must be open and the hourglass 10 recharged. At the bottom of each hopper 56 is a calibrated and removable nozzle. It provides closure by accumulation at the outlet on the upper face of a vibrating passage 58.
  • a trident device 62 comprises at least two branches which can be isolated from the rest of the equipment by vacuum valves 54A, 54B. In the center of the trident is a control device 64 making it possible to check the filling level of the sheath 67.
  • valves 54, 54A and 54B The part between the valves 54, 54A and 54B is permanently vacuum.
  • the sheath 67 is then closed by a crimping and welding device not shown here.
  • the entire installation can be controlled by a programmable controller which manages the powder treatment cycle.
  • the latter includes a slow primary emptying, then the ease of secondary vacuum, heating and the hourglass rotations.
  • This programmable controller can also manage the safety associated with the vacuum, temperature and valve opening functions.
  • FIG. 5 The assembly described in FIG. 5 is only an example of use of the installation according to the invention. We can indeed consider other possible assemblies using multiple channels arranged for example in a carousel.
  • the treatment of the powder can also be carried out under a controlled atmosphere or in a reactive atmosphere. Glove box mounting can even be considered for the treatment of toxic products.
  • the assembly described in FIG. 5 is particularly intended for vacuum encapsulation of powder intended for densification by hot isostatic pressing.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Drying Of Solid Materials (AREA)
  • Powder Metallurgy (AREA)

Claims (9)

  1. Verfahren zur Trocknung und Entgasung von Pulvern, das die folgenden Schritte umfaßt:
    - Einfüllen des Pulvers in eine Trocknungs- und Entgasungsvorrichtung, genannt Pulvertrommel ("sablier") (10);
    - Herstellen des relativen Vakuums in der Pulvertrommel (10);
    - Heizen des Inneren der Pulvertrommel auf eine Temperatur, die in dem Pulver eine Temperatur von 600°C gewährleistet und, simultan, langsames Umrühren des Pulvers im Innern der Pulvertrommel (10), einem bestimmten Drehkzyklus der Pulvertrommel (10) entsprechend;
    - Abkühlen des Inneren der Pulvertrommel (10); und
    - Entleeren des behandelten Pulvers aus der Pulvertrommel (10), wobei dieses Pulver unter Vakuum gespeichert wird.
  2. Verfahren nach Anspruch 1, wobei die Pulvertrommel (10) wenigstens zwei Abteile (4, 8) enthält, die miteinander in Verbindung stehen über eine Schikane (6), dadurch gekennzeichnet, daß das Umrühren des Pulvers durch langsames Drehen der Pulvertrommel (10) bewirkt wird, in einer ersten Richtung, um das Pulver nach und nach vom ersten Abteil (4) zum zweiten Abteil (8) fließen zu lassen, dann, durch langsames Drehen der Pulvertrommel (10) in eine zweite, der ersten Richtung entgegengesetzte Richtung, um das Pulver in das erste Abteil (4) zurückfließen zu lassen.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der Drehzyklus der Pulvertrommel (10) wenigstens eine Serie von Hin- und Herbewegungen um ihre horizontale Achse umfaßt, um das Umrühren und das Fließen den Pulvers von einem Abteil in das andere zu begünstigen.
  4. Anlage zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sie umfaßt:
    - eine Trocknungs- und Entgasungsvorrichtung, genannt Pulvertrommel ("sablier") (10), drehbar um ihre eigene Achse gelagert, umfassend:
    * eine Füll- und Entleerungsleitung (2), verbunden mit:
    * einem ersten Abteil (4), auf der anderen Seite verbunden mit:
    * einer Schikane (6), selbst verbunden mit:
    * einem zweiten Abteil (8),
    wobei die Füll- und Entleerungsleitung (2) und die Schikane (6) so in das erste Abteil (4) münden, daß das in die Füll- und Entleerungsleitung eingefüllte, oder aus dem zweiten Abteil (8) kommende Pulver für eine erste Serie von Winkelstellungen der Pulvertrommel (10) durch Schwerkraft in das erste Abteil (4) fällt und dort bleibt, wobei die Schikane (6) so in das zweite Abteil (8) mündet, daß das aus dem ersten Abteil (4) kommende Pulver für eine zweite Serie von, bezüglich der ersten Serie, unterschiedlichen Winkelstellungen der Pulvertrommel 10 nach und nacn in das zweite Abteil (8) fällt und dort bleibt, wobei die Winkeldifferenz der beiden Serien von Winkelstellungen den Drehungen der Pulvertrommel (10) entsprechen;
    - Heizeinrichtungen (12) der Pulvertrommel (10);
    - Drenantriebseinrichtungen der Pulvertrommel (10); und
    - Einrichtungen (54, 54A, 54B) zur Erzeugung des Vakuums für die Pulvertrommel (10) und das gespeicherte Pulver.
  5. Anlage nach Anspruch 4, dadurch gekennzeichnet, daß die Heizeinrichtungen des Inneren der Pulvertrommel (10) Heizplatten (12) sind, angeordnet außerhalb der Abteile (4, 8) und der Schikane (6).
  6. Anlage nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Drehantriebseinrichtungen der Pulvertrommel (10) gebildet werden durch eine Getriebemotor (22), der einer ersten Muffe einer lösbaren Kupplung mit radialer Freiheit (25) eine langsame Drehbewegung verleiht, wobei die zweite Muffe fest verbunden ist mit einer Drehantriebswelle (26) der Pulvertrommel (10).
  7. Anlage nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die Pulvertrommel (10) drehfrei auf einen verschiebbaren Wagen (16) montiert ist durch erste Laufrollen (40), auf denen sie ruht mittels Laufkränzen (42).
  8. Anlage nach den Ansprüchen 6 und 7, dadurch gekennzeichnet, daß sie umfaßt:
    - einen Vakuumbehälter (20), in dessen Inneres der Aufbau aus verschiebbarem Wagen (16) und Pulvertrommel (10) durch Horizontalverschiebung eingeführt wird;
    - eine herausziehbare Tür (30), befestigt auf dem verschiebbaren Träger (16), um den Behälter (20) hermetisch zu verschließen, wenn der Aufbau aus verschiebbarem Wagen (16) und Pulvertrommel (10) sich im Innern des Behälters (20) befindet, wobei die Drehantriebswelle (26) die Tür (30) durchquert mittels eines drehbaren dichten Durchlasses (27), auf dem die Pulvertrommel (10) aufliegt in ihrer Füllstellung außerhalb des Behälters (20);
    - einen Entleerungsauffang (52) der Pulvertrommel, angeordnet im Unterteil des Behälters (20), um das behandelte, aus der Entleerungsleitung (2) der Pulvertrommel (10) austretende Pulver aufzunehmen, wenn diese sich in der Entleerungsstellung im Innern des Behälters (20) befindet; und
    - ein Unterdruckventil (54), angeordnet am Ausgang des Entleerungsauffangs (52), um die Trennung der oberhalb und unterhalb befindlichen Teile zu gewährleisten und die Entleerung des Pulvers unter Vakuum in einen Speichertrichter (56).
  9. Anlage nach Anspruch 8, dadurch gekennzeichnet, daß der Behälter schräge Stützen (48) enthält, auf die sich zweite, drehfrei unter der Pulvertrommel angebrachte, der Positionierung dienende Laufrollen (50) setzen bei der Horizontalverschiebung des Aufbaus aus verschiebbarem Wagen (16) und Pulvertrommel (10), damit dieser Halt hat in dem Behälter (20), wenn er sich in dessen Innerem befindet.
EP91400894A 1990-04-03 1991-04-02 Verfahren und Vorrichtung zur Trocknung und Entgasung von Pulver Expired - Lifetime EP0451048B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9004254 1990-04-03
FR9004254A FR2660423B1 (fr) 1990-04-03 1990-04-03 Procede et installation de sechage et de degazage de poudres.

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EP0451048A1 EP0451048A1 (de) 1991-10-09
EP0451048B1 true EP0451048B1 (de) 1994-06-29

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EP91400894A Expired - Lifetime EP0451048B1 (de) 1990-04-03 1991-04-02 Verfahren und Vorrichtung zur Trocknung und Entgasung von Pulver

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EP (1) EP0451048B1 (de)
AT (1) ATE108015T1 (de)
DE (1) DE69102666T2 (de)
FR (1) FR2660423B1 (de)

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CN107485559A (zh) * 2017-09-21 2017-12-19 仲杏英 粉末干燥存取盒

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2839145B1 (fr) * 2002-04-30 2004-07-02 Hivert Systemes Automatises Procede de sechage sous vide d'une piece usinee et installation
US8357251B2 (en) * 2010-07-30 2013-01-22 United Technologies Corporation Powder processing method
CN109556374B (zh) * 2018-12-29 2023-12-19 钟山县洲星食品有限公司 一种蕨粉烘干装置

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CN107485559A (zh) * 2017-09-21 2017-12-19 仲杏英 粉末干燥存取盒
CN107485559B (zh) * 2017-09-21 2020-06-09 莱芜职业技术学院 粉末干燥存取盒

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EP0451048A1 (de) 1991-10-09
FR2660423A1 (fr) 1991-10-04
FR2660423B1 (fr) 1992-06-12
DE69102666D1 (de) 1994-08-04
ATE108015T1 (de) 1994-07-15
DE69102666T2 (de) 1995-01-12

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