EP0530636B1 - Device for mechanically treating powder especially nuclear combustion powder - Google Patents

Device for mechanically treating powder especially nuclear combustion powder Download PDF

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Publication number
EP0530636B1
EP0530636B1 EP92114423A EP92114423A EP0530636B1 EP 0530636 B1 EP0530636 B1 EP 0530636B1 EP 92114423 A EP92114423 A EP 92114423A EP 92114423 A EP92114423 A EP 92114423A EP 0530636 B1 EP0530636 B1 EP 0530636B1
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EP
European Patent Office
Prior art keywords
powder
vessel
feed
safety device
metering
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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EP92114423A
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German (de)
French (fr)
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EP0530636A1 (en
Inventor
Gerd Dr. Kindleben
Wilhelm Königs
Hans-Peter Schneider
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Siemens AG
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Siemens AG
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Publication of EP0530636A1 publication Critical patent/EP0530636A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/881—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise by weighing, e.g. with automatic discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/60—Mixing solids with solids

Definitions

  • the invention relates to a device for mechanical processing of powder, in particular nuclear fuel powder, according to the preamble of patent claim 1.
  • the invention has for its object to develop the device for mechanical processing of powder and to monitor the process control for correctness to the extent that no critical powder mass can form in the process container.
  • the fact that the safety device blocks the conveying device when the sum of the masses of the individual portions conveyed into the process container reaches a predetermined first limit value ensures that the total powder mass which has entered the process container from the metering container cannot in itself build up a critical mass in the process container.
  • the fact that the safety device also blocks the conveying device when the powder mass measured in the receptacle after emptying the process container in the receptacle differs from the sum of the powder masses of the individual portions conveyed into the process container by a predetermined value or more ensures that by conveying Powder with the dosing container in the process container, the residual powder mass (hold up) inevitably retained in the process container cannot form a critical mass with the supplied powder mass.
  • the claims 2 to 6 are directed to advantageous developments of the device according to the invention.
  • the development according to claim 3 takes into account the fact that the presence of a sufficiently large mass of powder, which reduces criticality, can be used to promote criticality-causing powder into the process container.
  • the development according to claim 4 takes into account the fact that too much of the criticality-causing powder must not get into the process container.
  • the development according to claim 5 monitors that not too much powder can get into the receptacle.
  • the device for mechanically processing nuclear fuel powder has a process container 2 which is mounted in fixed bearings 3 so as to be pivotable about a horizontal pivot axis.
  • This process container 2 can be, for example, a ball mill or a mixer.
  • a swivel motor 4 for swiveling the process container 2 about the horizontal swivel axis is assigned to this process container 2.
  • the process container 2 also has a filler neck 5, in which a closure body 6, which can be rotated about a transverse axis and has a passage channel 7 for powder to be processed, is mounted.
  • a scale 8 hangs over the process container 2.
  • a vertical rod 9 with one coupling half of a coupling 10 hangs on this scale 8, in turn, a further vertical rod 11 hangs on the other coupling half of the coupling 10, which has a powder conveying device 12 and one below this powder conveying device 12 located dosing vessel 13 passes through.
  • This metering vessel 13 has a wide upper filling opening 13a and a narrow lower emptying opening 13b.
  • At the bottom has vertical rod 11 a sealing cone 14 tapering towards the upper end of the rod 11, which is loosely fitted into the lower emptying opening 13b.
  • This sealing cone 14 tightly closes the lower emptying opening 13b of the metering vessel 13.
  • the metering vessel 13 with its lower emptying opening 13b sits firmly on the jacket of the sealing cone 14 and thus hangs with the rod 11 on the lower coupling half of the coupling 10.
  • the powder conveying device 12 has two separate conveying paths 15 and 16. There are conveying coils 15a and 16a in each conveying path. Each feed spiral 15a and 16a has an electric drive motor 15b and 16b, respectively. Each conveyor path 15 and 16 has a feed opening 15c and 16c and an outlet opening 15d and 16d. While the feed openings 15c and 16c are each connected to a storage container (not shown), the outlet openings 15d and 16d open downwards into the upper fill opening 13a of the metering vessel 13.
  • a lifting device 17 with an electric lifting motor 17a acts on the rod 11. Furthermore, a metal strip 18a is attached to the rod 11 and is associated with a detection device 18 consisting of a proximity switch for detecting the closed position of the lower emptying opening 13b of the metering vessel 13. Similarly, on the outside of the metering vessel 13, a metal strip 19a is attached, which is associated with a detection device 19 consisting of a proximity switch for the readiness of the scale 8 for weighing the contents of the metering vessel 13.
  • the metal process container 2 is associated with a detection device 21 consisting of a proximity switch for detecting the emptying position of the process container 2.
  • a signal line 25 leads from the scale 8
  • a signal line 26 leads from the scale 22
  • a signal line 27 from the recognition device 18 leads from the scale 22
  • a signal line 28 from the recognition device 19 leads from the input of an electronic safety device 31.
  • An electrical feed line 32 leads to the swivel motor 4 of the process container 2, an electrical feed line 33 to the drive motor 15b of the feed spiral 15a and an electrical feed line 34 to the electric drive motor 16b of the feed spiral 16a.
  • a switching device 35 to 37 is located in each of the feed lines 32 to 34. Signal lines 38 to 40 lead to these switching devices 35 to 37 from the output of the electronic safety device 31.
  • the switching devices 35 to 37 are switches 41 to 43 in the electrical feed lines 32 to 34 upstream. These switches 41 to 43 belong to a process control device that can work manually or automatically. Between the switching device 36 and the switch 42, a signal line 39a goes from the electrical feed line 33 to the signal input of the safety device 31 and between the switching device 37 and switch 43 from the electrical feed line 34 a signal line 40a to the signal input of the safety device 31.
  • an electrical feed line leading to the electric lifting motor 17a which also has a switch belonging to the process control device.
  • an electrical feed line is also not shown to the excitation coil of the clutch 10 and this feed line also contains a switch belonging to the process control device.
  • the scale 8 in FIG. 1 has two bending beam scales 44 and 45 assembled in series.
  • Each bending beam scale consists of a steel rod with a rectangular cross-section.
  • each steel rod On a side parallel to the plane of the drawing in FIG. 2, each steel rod has in the middle two continuous bores 44a and 44b or 45a and 45b which are perpendicular to this side, the cross sections of which partially overlap.
  • Strain gauges 44c and 45c are attached to the two sides of each steel rod, to which the two through bores 44a and 44b or 45a and 45b are parallel, where the diameters of the two bores are perpendicular to these sides .
  • the two bending beam scales 44 and 45 are arranged overlapping one another at a distance from one another and in the vertical longitudinal direction.
  • the lower cantilever scale 45 hangs at one end on one end of the upper cantilever scale 44, while the other end of the upper cantilever scale 44 e.g. is suspended from a frame, not shown.
  • the rod 9 hangs at the other end of the lower bending beam scale 45.
  • the four strain gauges 44c and 45c on each bending beam scale 44 and 45 are each connected in a Wheatstone bridge.
  • the output of the Wheatstone bridge formed by the strain gauges 44c of the beam balance 44 is connected to the process control device by a signal line, not shown.
  • the output of the Wheatstone bridge formed by the strain gauges 45c of the other bending beam scales 45 is led through the signal line 25 to the signal input of the safety device 31.
  • the switch 42 is first closed by a suitably programmed process control device or by hand, so that the drive motor 15b drives the conveying spiral 15a of the conveying path 15 of the conveying device 12 and, for example, UO2 powder naturally enriched with U 235 in the metering container 13 is promoted.
  • the conveying path 15 is the permitted conveying path, so that the safety device 31 does not actuate the switching device 36 and does not interrupt the feed line 33 leading to the drive motor 15b. If, on the other hand, the switch 43 had been actuated first, the conveyor motor 16b would have had to drive the conveyor spiral 16a of the conveyor path 16.
  • the conveyor path 16 is not permitted, however, so that the safety device 31 would have opened the switching device 37 and would have blocked the conveyor path 16. In addition, the safety device 31 could also have blocked the switching device 36 and thus the entire conveyor device 12.
  • the detection device 18 also signals via the signal line 27 that the lower emptying opening 13b of the metering vessel 13 is closed. Since the coupling 10 is closed, the detection device 19 can also signal readiness for weighing for the metering vessel 13 via the signal line 28 to the monitoring device 31, and the safety device 31 measures the mass of the powder in the metering vessel 13 determined by the balance 8 and which was conveyed through the conveying path 15 into the metering vessel 13. The measured mass is summed up and stored both in a component memory of the safety device 31 assigned to the conveying path 15 and in an overall memory of this safety device 31.
  • the process control device After switching off the conveyor motor 15b by opening the switch 42 by the process control device, the process control device releases the clutch 10 and actuates the lifting motor 17a, so that the lifting device 17 lowers the rod 11 with the dosing vessel 13 attached to it and with the lower emptying opening 13b settles on the filler neck 5 of the process container 3.
  • the closure body 6 in the filler neck 5 is rotated so that the passage 7 in the closure body 6 is directed vertically.
  • the rod 11 is lowered even further with the lifting device 17, so that the sealing cone 14 opens the lower emptying opening 13b of the metering vessel 13 and the powder trickles out of the metering vessel 13 into the process container 2.
  • the process control device then operates the lifting motor 17a in the opposite direction, and the lifting device 17 lifts the rod 11 again.
  • the sealing cone 14 again closes the lower emptying opening 13b and finally the rod 11 lifts the metering vessel 13 and carries it back into the filling position shown in FIG. 1.
  • the rod 11 automatically couples to the rod 9 again via the coupling 10, and the metering vessel 13 is again ready for weighing.
  • the safety device 31 adds up the masses of the UO 2 powder filled in portions from the metering device 13 via the conveying path 15 into the process container 2. When the sum of these masses reaches a predetermined limit value, the safety device releases the blocking of the conveying path 16 by keeping the switching device 37 closed and opening the switching device 36 when the switch 43 is actuated.
  • the metering vessel 13 conveys powder, for example consisting of U / Pu mixed oxide, supplied via the conveying path 16 into the process container 2.
  • the safety device 31 sums up in a component memory associated with this conveying path 16 and in the total memory also the masses of this into the process container 2 U / Pu mixed oxide powder conveyed in portions and deposits the measured masses.
  • the safety device 31 finally blocks the conveying path 16 again by keeping the switching device 37 open when the sum of the masses of the U / Pu mixed oxide powder conveyed via the conveying path 16 reaches a predetermined limit value.
  • the safety device 31 also blocks the conveying device 12 by opening the switching devices 36 and 37 when the sum of the powder masses filled in the process container 2 reaches a predetermined limit value.
  • the process container 2 is pivoted through 90 ° about the axis determined by the bearing 3 and the process, e.g. Grinding or mixing of the powder in the process container carried out.
  • the process container 2 is pivoted about the axis determined by the bearing 3 by a further 90 ° and is docked with the filler neck 5 to the hopper 24 of the receptacle 23.
  • the closure body 6 has been brought back into the emptying position with the vertical passage channel 7, the powder trickles out of the process container 2 into the receiving container 23.
  • closure body 6 is brought back into the closed position and the process container 2 is pivoted about the axis determined by the bearing 3 into the starting position shown in FIG.
  • the detection device 21 for emptying the process container 2 had previously given a signal to the input of the safety device 31, and this safety device 31 compares the mass of the powder located in the receptacle 23 with the scale 22 with the mass stored in the total memory of the safety device 31. It opens the switching devices 36 and 37 blocking the conveying device 12 when the one measured in the receptacle 23 Powder mass differs from the sum of the powder masses of the individual portions conveyed into the process container 2 with the metering vessel 13 by a predetermined value or more.
  • the process container 2 can be filled several times and emptied several times into the receiving container 23.
  • the safety device 31 opens the switching device 35 by blocking the swivel motor 4 when either the powder mass measured by the scale 22 in the receptacle 23 reaches or exceeds a predetermined limit value or when the signals from the detection device 21 for emptying the process container 2 from the safety device 31 counted empties of the process container 2 in the receiving container 23 reaches a predetermined value.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Description

Die Erfindung betrifft eine Einrichtung zum mechanischen Bearbeiten von Pulver, insbesondere Kernbrennstoffpulver, entsprechend dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for mechanical processing of powder, in particular nuclear fuel powder, according to the preamble of patent claim 1.

Eine solche Einrichtung ist bereits üblich. Soll diese Einrichtung in großtechnischem Maßstab benutzt werden, so muß der Prozeßbehälter so groß ausgeführt sein, daß in ihm gleichzeitig eine verhältnismäßig große Pulvermasse mechanisch bearbeitet werden kann.Such a facility is already common. If this device is to be used on an industrial scale, the process container must be made so large that a relatively large powder mass can be machined in it at the same time.

Bei der Bearbeitung von Pulver, das eine kritische Masse bilden kann, wie z.B. Kernbrennstoffpulver, ist es wichtig, daß mit dem Dosiergefäß in den Prozeßbehälter portionsweise eindosiertes Pulver im Prozeßbehälter keine Gesamtmasse bildet, die auch nur annähernd eine kritische Masse ist. Der zwischen der Pulverfördervorrichtung und dem Aufnahmebehälter ablaufende Prozeß wird von Hand oder durch eine automatische Prozeßsteuervorrichtung in diesem Sinne gesteuert.When processing powder that can form a critical mass, such as Nuclear fuel powder, it is important that powder metered into the process container with the metering vessel does not form a total mass in the process container that is even approximately a critical mass. The process between the powder conveying device and the receptacle is controlled by hand or by an automatic process control device in this sense.

Der Erfindung liegt die Aufgabe zugrunde, die Einrichtung zum mechanischen Bearbeiten von Pulver weiterzubilden und die Prozeßsteuerung auf Richtigkeit insofern zu überwachen, daß sich keine kritische Pulvermasse im Prozeßbehälter ausbilden kann.The invention has for its object to develop the device for mechanical processing of powder and to monitor the process control for correctness to the extent that no critical powder mass can form in the process container.

Zur Lösung dieser Aufgabe hat eine Einrichtung der eingangs erwähnten Art erfindungsgemäß die Merkmale des kennzeichnenden Teils des Patentanspruchs 1.To achieve this object, a device of the type mentioned at the outset has the features of the characterizing part of patent claim 1.

Dadurch, daß die Sicherheitsvorrichtung die Fördervorrichtung blockiert, wenn die Summe der Massen der in den Prozeßbehälter geförderten Einzelportionen einen vorgegebenen ersten Grenzwert erreicht, wird sichergestellt, daß die aus dem Dosierbehälter in den Prozeßbehälter gelangte Gesamtpulvermasse für sich allein keine kritische Masse im Prozeßbehälter aufbauen kann. Dadurch, daß die Sicherheitsvorrichtung die Fördervorrichtung ebenfalls blockiert, wenn die nach dem Entleeren des Prozeßbehälters in den Aufnahmebehälter gemessene Pulvermasse im Aufnahmebehälter von der Summe der Pulvermassen der in den Prozeßbehälter geförderten Einzelportionen um einen vorgegebenen Wert oder mehr differiert, wird sichergestellt, daß durch Zufördern von Pulver mit dem Dosierbehälter in den Prozeßbehälter die im Prozeßbehälter unvermeidlich zurückgehaltene Restpulvermasse (hold up) mit der zugeförderten Pulvermasse keine kritische Masse bilden kann.The fact that the safety device blocks the conveying device when the sum of the masses of the individual portions conveyed into the process container reaches a predetermined first limit value ensures that the total powder mass which has entered the process container from the metering container cannot in itself build up a critical mass in the process container. The fact that the safety device also blocks the conveying device when the powder mass measured in the receptacle after emptying the process container in the receptacle differs from the sum of the powder masses of the individual portions conveyed into the process container by a predetermined value or more ensures that by conveying Powder with the dosing container in the process container, the residual powder mass (hold up) inevitably retained in the process container cannot form a critical mass with the supplied powder mass.

Die Patentansprüche 2 bis 6 sind auf vorteilhafte Weiterbildungen der erfindungsgemäßen Einrichtung gerichtet.The claims 2 to 6 are directed to advantageous developments of the device according to the invention.

Durch die Weiterbildung nach Patentanspruch 2 kann sichergestellt werden, daß über den zweiten Förderweg in das Dosiergefäß kein Pulver gefördert werden kann, das beispielsweise in verhältnismäßig geringer Masse Kritikalität hervorrufen könnte, wenn nicht zuvor über den ersten Förderweg in das Dosiergefäß eine genügende Masse eines anderen, z.B. Kritikalität herabsetzenden Pulvers, gefördert worden ist.The further development according to claim 2 can ensure that no powder can be conveyed into the metering vessel via the second conveying path, which could cause criticality, for example, in a relatively small mass, if not a sufficient mass of another, via the first conveying path into the metering vessel, e.g. Powder that reduces criticality has been promoted.

Die Weiterbildung nach Patentanspruch 3 trägt der Tatsache Rechnung, daß bei Vorhandensein einer genügend großen Masse von Pulver, das die Kritikalität herabsetzt, die Förderung von Kritikalität hervorrufenden Pulver in den Prozeßbehälter vorgenommen werden kann.The development according to claim 3 takes into account the fact that the presence of a sufficiently large mass of powder, which reduces criticality, can be used to promote criticality-causing powder into the process container.

Die Weiterbildung nach Patentanspruch 4 trägt der Tatsache Rechnung, daß nicht zu viel von dem Kritikalität hervorrufenden Pulver in den Prozeßbehälter gelangen darf.The development according to claim 4 takes into account the fact that too much of the criticality-causing powder must not get into the process container.

Die Weiterbildung nach Patentanspruch 5 überwacht, daß nicht zu viel Pulver insgesamt in den Aufnahmebehälter gelangen kann.The development according to claim 5 monitors that not too much powder can get into the receptacle.

Dies wird auch durch die Weiterbildung nach Patentanspruch 6 erzielt. Es wird aber auch eine große Bandbreite der Einstellung der Mischungsverhältnisse der durch die verschiedenen Förderwege geförderten Pulver im Aufnahmebehälter ermöglicht.This is also achieved by the training according to claim 6. However, a wide range of adjustment of the mixing ratios of the powders conveyed through the various conveying paths in the receiving container is also made possible.

Die Erfindung und ihre Vorteile seien anhand der Zeichnung an einem Ausführungsbeispiel näher erläutert:

  • Figur 1 zeigt stark schematisiert eine Einrichtung zum mechanischen Bearbeiten von Kernbrennstoffpulver.
  • Figur 2 zeigt schematisiert eine Waage für die Einrichtung nach Figur 1.
The invention and its advantages are explained in more detail with reference to the drawing using an exemplary embodiment:
  • Figure 1 shows a highly schematic of a device for mechanical processing of nuclear fuel powder.
  • FIG. 2 shows schematically a scale for the device according to FIG. 1.

Die Vorrichtung zum mechanischen Bearbeiten von Kernbrennstoffpulver nach Figur 1 weist einen Prozeßbehälter 2 auf, der in ortsfesten Lagern 3 um eine horizontale Schwenkachse schwenkbar gelagert ist. Dieser Prozeßbehälter 2 kann beispielsweise eine Kugelmühle oder ein Mischer sein. Diesem Prozeßbehälter 2 ist ein Schwenkmotor 4 zum Schwenken des Prozeßbehälters 2 um die horizontale Schwenkachse zugeordnet. Der Prozeßbehälter 2 weist ferner einen Einfüllstutzen 5 auf, in dem ein um eine Querachse drehbarer Verschlußkörper 6 mit Durchtrittskanal 7 für zu bearbeitendes Pulver gelagert ist.The device for mechanically processing nuclear fuel powder according to FIG. 1 has a process container 2 which is mounted in fixed bearings 3 so as to be pivotable about a horizontal pivot axis. This process container 2 can be, for example, a ball mill or a mixer. A swivel motor 4 for swiveling the process container 2 about the horizontal swivel axis is assigned to this process container 2. The process container 2 also has a filler neck 5, in which a closure body 6, which can be rotated about a transverse axis and has a passage channel 7 for powder to be processed, is mounted.

Über dem Prozeßbehälter 2 hängt eine Waage 8. An dieser Waage 8 ihrerseits hängt eine vertikale Stange 9 mit der einen Kupplungshälfte einer Kupplung 10. An der anderen Kupplungshälfte der Kupplung 10 hängt eine weitere vertikale Stange 11, die eine Pulverfördervorrichtung 12 und ein unterhalb dieser Pulverfördervorrichtung 12 befindliches Dosiergefäß 13 durchgreift. Dieses Dosiergefäß 13 hat eine weite obere Einfüllöffnung 13a und eine enge untere Entleeröffnung 13b. Am Unterende hat die vertikale Stange 11 einen sich zum Oberende der Stange 11 hin verjüngenden Dichtungskegel 14, der lose in die untere Entleeröffnung 13b eingepaßt ist. Dieser Dichtungskegel 14 verschließt die untere Entleeröffnung 13b des Dosiergefäßes 13 dicht. Zugleich sitzt das Dosiergefäß 13 mit seiner unteren Entleeröffnung 13b fest auf dem Mantel des Dichtungskegels 14 auf und hängt so mit der Stange 11 an der unteren Kupplungshälfte der Kupplung 10.A scale 8 hangs over the process container 2. A vertical rod 9 with one coupling half of a coupling 10 hangs on this scale 8, in turn, a further vertical rod 11 hangs on the other coupling half of the coupling 10, which has a powder conveying device 12 and one below this powder conveying device 12 located dosing vessel 13 passes through. This metering vessel 13 has a wide upper filling opening 13a and a narrow lower emptying opening 13b. At the bottom it has vertical rod 11 a sealing cone 14 tapering towards the upper end of the rod 11, which is loosely fitted into the lower emptying opening 13b. This sealing cone 14 tightly closes the lower emptying opening 13b of the metering vessel 13. At the same time, the metering vessel 13 with its lower emptying opening 13b sits firmly on the jacket of the sealing cone 14 and thus hangs with the rod 11 on the lower coupling half of the coupling 10.

Die Pulverfördervorrichtung 12 hat zwei getrennte Förderwege 15 und 16. In jedem Förderweg befindet sich eine Förderwendel 15a bzw. 16a. Jede Förderwendel 15a und 16a hat einen elektrischen Antriebsmotor 15b bzw. 16b. Jeder Förderweg 15 und 16 hat eine Zufuhröffnung 15c und 16c sowie eine Austrittsöffnung 15d und 16d. Während die Zufuhröffnungen 15c und 16c jeweils an einem nicht dargestellten Vorratsbehälter angeschlossen sind, münden die Austrittsöffnungen 15d und 16d nach unten in die obere Einfüllöffnung 13a des Dosiergefäßes 13.The powder conveying device 12 has two separate conveying paths 15 and 16. There are conveying coils 15a and 16a in each conveying path. Each feed spiral 15a and 16a has an electric drive motor 15b and 16b, respectively. Each conveyor path 15 and 16 has a feed opening 15c and 16c and an outlet opening 15d and 16d. While the feed openings 15c and 16c are each connected to a storage container (not shown), the outlet openings 15d and 16d open downwards into the upper fill opening 13a of the metering vessel 13.

An der Stange 11 greift eine Hubvorrichtung 17 mit einem elektrischen Hubmotor 17a an. Ferner ist an der Stange 11 ein Metallstreifen 18a angebracht, der einer aus einem Näherungsschalter bestehenden Erkennungsvorrichtung 18 zum Erkennen des Geschlossenseins der unteren Entleeröffnung 13b des Dosiergefäßes 13 zugeordnet ist. Ähnlich ist außen am Dosiergefäß 13 ein Metallstreifen 19a angebracht, der eine aus einem Näherungsschalter bestehenden Erkennungsvorrichtung 19 für die Wiegebereitschaft der Waage 8 zum Wiegen des Inhalts des Dosiergefäßes 13 zugeordnet ist.A lifting device 17 with an electric lifting motor 17a acts on the rod 11. Furthermore, a metal strip 18a is attached to the rod 11 and is associated with a detection device 18 consisting of a proximity switch for detecting the closed position of the lower emptying opening 13b of the metering vessel 13. Similarly, on the outside of the metering vessel 13, a metal strip 19a is attached, which is associated with a detection device 19 consisting of a proximity switch for the readiness of the scale 8 for weighing the contents of the metering vessel 13.

Schließlich ist der aus Metall bestehende Prozeßbehälter 2 einer aus einem Näherungsschalter bestehenden Erkennungsvorrichtung 21 zum Erkennen der Entleerstellung des Prozeßbehälters 2 zugeordnet.Finally, the metal process container 2 is associated with a detection device 21 consisting of a proximity switch for detecting the emptying position of the process container 2.

Unterhalb des Prozeßbehälters 2 befindet sich auf einer Waage 22 ein Aufnahmebehälter 23 mit einem Auffülltrichter 24 zum Andocken an den Einfüllstutzen 5 des Prozeßbehälters 2.Below the process container 2 there is a receptacle 23 with a filling funnel 24 for docking onto the filler neck 5 of the process container 2 on a scale 22.

Von der Waage 8 führt eine Signalleitung 25, von der Waage 22 eine Signalleitung 26, von der Erkennungsvorrichtung 18 eine Signalleitung 27, von der Erkennungsvorrichtung 19 eine Signalleitung 28, und von der Erkennungsvorrichtung 21 eine Signalleitung 30 zum Eingang einer elektronischen Sicherheitsvorrichtung 31.A signal line 25 leads from the scale 8, a signal line 26 leads from the scale 22, a signal line 27 from the recognition device 18, a signal line 28 from the recognition device 19, and a signal line 30 from the recognition device 21 to the input of an electronic safety device 31.

Eine elektrische Speiseleitung 32 führt zum Schwenkmotor 4 des Prozeßbehälters 2, eine elektrische Speiseleitung 33 zum Antriebsmotor 15b der Förderwendel 15a und eine elektrische Speiseleitung 34 zum elektrischen Antriebsmotor 16b der Förderwendel 16a. In jeder der Speiseleitungen 32 bis 34 befindet sich eine Schaltvorrichtung 35 bis 37. Zu diesen Schaltvorrichtungen 35 bis 37 führen Signalleitungen 38 bis 40 vom Ausgang der elektronischen Sicherheitsvorrichtung 31. Den Schaltvorrichtungen 35 bis 37 sind in den elektrischen Speiseleitungen 32 bis 34 Schalter 41 bis 43 vorgeschaltet. Diese Schalter 41 bis 43 gehören zu einer Prozeßsteuervorrichtung, die manuell oder auch automatisch arbeiten kann. Zwischen Schaltvorrichtung 36 und Schalter 42 geht von der elektrischen Speiseleitung 33 eine Signalleitung 39a zum Signaleingang der Sicherheitsvorrichtung 31 und zwischen Schaltvorrichtung 37 und Schalter 43 von der elektrischen Speiseleitung 34 eine Signalleitung 40a zum Signaleingang der Sicherheitsvorrichtung 31 ab.An electrical feed line 32 leads to the swivel motor 4 of the process container 2, an electrical feed line 33 to the drive motor 15b of the feed spiral 15a and an electrical feed line 34 to the electric drive motor 16b of the feed spiral 16a. A switching device 35 to 37 is located in each of the feed lines 32 to 34. Signal lines 38 to 40 lead to these switching devices 35 to 37 from the output of the electronic safety device 31. The switching devices 35 to 37 are switches 41 to 43 in the electrical feed lines 32 to 34 upstream. These switches 41 to 43 belong to a process control device that can work manually or automatically. Between the switching device 36 and the switch 42, a signal line 39a goes from the electrical feed line 33 to the signal input of the safety device 31 and between the switching device 37 and switch 43 from the electrical feed line 34 a signal line 40a to the signal input of the safety device 31.

Nicht dargestellt ist eine zum elektrischen Hubmotor 17a führende elektrische Speiseleitung, die ebenfalls einen zur Prozeßsteuervorrichtung gehörenden Schalter aufweist. Nicht dargestellt ist schließlich auch eine elektrische Speiseleitung zur Erregerspule der Kupplung 10 und diese Speiseleitung enthält ebenfalls einen zur Prozeßsteuervorrichtung gehörenden Schalter.Not shown is an electrical feed line leading to the electric lifting motor 17a, which also has a switch belonging to the process control device. Finally, an electrical feed line is also not shown to the excitation coil of the clutch 10 and this feed line also contains a switch belonging to the process control device.

Nach der Seitenansicht entsprechend Figur 2 weist die Waage 8 in Figur 1 zwei in Serie zusammengebaute Biegebalken-Waagen 44 und 45 auf. Jede Biegebalken-Waage besteht aus einem Stahlstab mit rechteckigem Querschnitt. An einer zur Zeichenebene der Figur 2 parallelen Seite weist jeder Stahlstab in der Mitte zwei durchgehende, zu dieser Seite rechtwinklige Bohrungen 44a und 44b bzw. 45a und 45b auf, deren Querschnitte sich zu einem Teil überlappen. An den beiden Seiten jedes Stahlstabs, zu denen die beiden durchgehenden Bohrungen 44a und 44b bzw. 45a und 45b parallel sind, ist an den Stellen, an denen die Durchmesser der beiden Bohrungen rechtwinklig zu diesen Seiten sind, je ein Dehnungsmeßstreifen 44c bzw. 45c angebracht.According to the side view corresponding to FIG. 2, the scale 8 in FIG. 1 has two bending beam scales 44 and 45 assembled in series. Each bending beam scale consists of a steel rod with a rectangular cross-section. On a side parallel to the plane of the drawing in FIG. 2, each steel rod has in the middle two continuous bores 44a and 44b or 45a and 45b which are perpendicular to this side, the cross sections of which partially overlap. Strain gauges 44c and 45c are attached to the two sides of each steel rod, to which the two through bores 44a and 44b or 45a and 45b are parallel, where the diameters of the two bores are perpendicular to these sides .

Die beiden Biegebalken-Waagen 44 und 45 sind sich überdeckend mit Abstand voneinander und vertikaler Längsrichtung übereinander angeordnet. Die untere Biegebalken-Waage 45 hängt mit einem Ende an einem Ende der oberen Biegebalken-Waage 44, während das andere Ende der oberen Biegebalken-Waage 44 z.B. an einem nicht dargestellten Gestell aufgehängt ist. Am anderen Ende der unteren Biegebalken-Waage 45 hängt die Stange 9.The two bending beam scales 44 and 45 are arranged overlapping one another at a distance from one another and in the vertical longitudinal direction. The lower cantilever scale 45 hangs at one end on one end of the upper cantilever scale 44, while the other end of the upper cantilever scale 44 e.g. is suspended from a frame, not shown. The rod 9 hangs at the other end of the lower bending beam scale 45.

Die vier Dehnungsmeßstreifen 44c bzw. 45c an jeder Biegebalken-Waage 44 und 45 sind jeweils in einer Wheatstone'schen Brücke geschaltet. Der Ausgang der durch die Dehnungsmeßstreifen 44c der Biegebalken-Waage 44 gebildeten Wheatstone'schen Brücke ist mit einer nicht dargestellten Signalleitung mit der Prozeßsteuervorrichtung verbunden. Der Ausgang der durch die Dehnungsmeßstreifen 45c der anderen Biegebalken-Waage 45 gebildeten Wheatstone'schen Brücke ist durch die Signalleitung 25 zum Signaleingang der Sicherheitsvorrichtung 31 geführt.The four strain gauges 44c and 45c on each bending beam scale 44 and 45 are each connected in a Wheatstone bridge. The output of the Wheatstone bridge formed by the strain gauges 44c of the beam balance 44 is connected to the process control device by a signal line, not shown. The output of the Wheatstone bridge formed by the strain gauges 45c of the other bending beam scales 45 is led through the signal line 25 to the signal input of the safety device 31.

In der Einrichtung nach Figur 1 wird durch eine entsprechend programmierte Prozeßsteuervorrichtung oder von Hand zunächst der Schalter 42 geschlossen, so daß der Antriebsmotor 15b die Förderwendel 15a des Förderwegs 15 der Fördervorrichtung 12 antreibt und beispielsweise UO₂-Pulver natürlicher Anreicherung mit U 235 in den Dosierbehälter 13 gefördert wird. Der Förderweg 15 ist der zugelassene Förderweg, so daß die Sicherheitsvorrichtung 31 die Schaltvorrichtung 36 nicht betätigt und die zum Antriebsmotor 15b führende Speiseleitung 33 nicht unterbricht. Wäre hingegen zuerst der Schalter 43 betätigt worden, so hätte der Fördermotor 16b die Förderwendel 16a des Förderwegs 16 antreiben müssen. Der Förderweg 16 ist aber nicht zugelassen, so daß die Sicherheitsvorrichtung 31 die Schaltvorrichtung 37 geöffnet und damit den Förderweg 16 blockiert hätte. Zusätzlich hätte die Sicherheitsvorrichtung 31 auch noch die Schaltvorrichtung 36 und damit die gesamte Fördervorrichtung 12 blockieren können.In the device according to FIG. 1, the switch 42 is first closed by a suitably programmed process control device or by hand, so that the drive motor 15b drives the conveying spiral 15a of the conveying path 15 of the conveying device 12 and, for example, UO₂ powder naturally enriched with U 235 in the metering container 13 is promoted. The conveying path 15 is the permitted conveying path, so that the safety device 31 does not actuate the switching device 36 and does not interrupt the feed line 33 leading to the drive motor 15b. If, on the other hand, the switch 43 had been actuated first, the conveyor motor 16b would have had to drive the conveyor spiral 16a of the conveyor path 16. The conveyor path 16 is not permitted, however, so that the safety device 31 would have opened the switching device 37 and would have blocked the conveyor path 16. In addition, the safety device 31 could also have blocked the switching device 36 and thus the entire conveyor device 12.

Die Erkennungsvorrichtung 18 signalisiert ferner über die Signalleitung 27 das Geschlossensein der unteren Entleeröffnung 13b des Dosiergefäßes 13. Da die Kupplung 10 geschlossen ist, kann auch die Erkennungsvorrichtung 19 Wiegebereitschaft für das Dosiergefäß 13 über die Signalleitung 28 der Überwachungsvorrichtung 31 signalisieren, und die Sicherheitsvorrichtung 31 mißt die durch die Waage 8 bestimmte Masse des in dem Dosiergefäß 13 befindlichen Pulvers, das durch den Förderweg 15 in das Dosiergefäß 13 gefördert wurde. Die gemessene Masse wird sowohl in einem dem Förderweg 15 zugeordneten Komponentenspeicher der Sicherheitsvorrichtung 31 als auch in einem Gesamtspeicher dieser Sicherheitsvorrichtung 31 aufsummiert und abgelegt.The detection device 18 also signals via the signal line 27 that the lower emptying opening 13b of the metering vessel 13 is closed. Since the coupling 10 is closed, the detection device 19 can also signal readiness for weighing for the metering vessel 13 via the signal line 28 to the monitoring device 31, and the safety device 31 measures the mass of the powder in the metering vessel 13 determined by the balance 8 and which was conveyed through the conveying path 15 into the metering vessel 13. The measured mass is summed up and stored both in a component memory of the safety device 31 assigned to the conveying path 15 and in an overall memory of this safety device 31.

Nach Abschalten des Fördermotors 15b durch Öffnen des Schalters 42 durch die Prozeßsteuervorrichtung löst die Prozeßsteuervorrichtung die Kupplung 10 und betätigt den Hubmotor 17a, so daß die Hubvorrichtung 17 die Stange 11 mit dem an ihr hängenden Dosiergefäß 13 absenkt und mit der unteren Entleeröffnung 13b auf den Einfüllstutzen 5 des Prozeßbehälters 3 absetzt. Vorher wird der Verschlußkörper 6 im Einfüllstutzen 5 so gedreht, daß der Durchtrittskanal 7 im Verschlußkörper 6 vertikal gerichtet ist. Die Stange 11 wird mit der Hubvorrichtung 17 noch weiter abgesenkt, so daß der Dichtungskegel 14 die untere Entleeröffnung 13b des Dosiergefäßes 13 freigibt und das Pulver aus dem Dosiergefäß 13 in den Prozeßbehälter 2 rieselt.After switching off the conveyor motor 15b by opening the switch 42 by the process control device, the process control device releases the clutch 10 and actuates the lifting motor 17a, so that the lifting device 17 lowers the rod 11 with the dosing vessel 13 attached to it and with the lower emptying opening 13b settles on the filler neck 5 of the process container 3. Before that, the closure body 6 in the filler neck 5 is rotated so that the passage 7 in the closure body 6 is directed vertically. The rod 11 is lowered even further with the lifting device 17, so that the sealing cone 14 opens the lower emptying opening 13b of the metering vessel 13 and the powder trickles out of the metering vessel 13 into the process container 2.

Hierauf wird von der Prozeßsteuervorrichtung der Hubmotor 17a in entgegengesetzter Richtung betrieben, und die Hubvorrichtung 17 hebt die Stange 11 wieder an. Hierbei verschließt zunächst der Dichtungskegel 14 wieder die untere Entleeröffnung 13b und schließlich hebt die Stange 11 das Dosiergefäß 13 an und trägt es wieder in die in Figur 1 dargestellte Befüllstellung. Schließlich kuppelt die Stange 11 selbsttätig über die Kupplung 10 wieder an der Stange 9 an, und das Dosiergefäß 13 ist erneut in Wiegebereitschaft.The process control device then operates the lifting motor 17a in the opposite direction, and the lifting device 17 lifts the rod 11 again. Here, the sealing cone 14 again closes the lower emptying opening 13b and finally the rod 11 lifts the metering vessel 13 and carries it back into the filling position shown in FIG. 1. Finally, the rod 11 automatically couples to the rod 9 again via the coupling 10, and the metering vessel 13 is again ready for weighing.

Dieser Vorgang wird entsprechend oft wiederholt, bis der Prozeßbehälter 2 ausreichend mit Pulver gefüllt ist. Die Sicherheitsvorrichtung 31 summiert hierbei die Massen des aus der Dosiervorrichtung 13 über den Förderweg 15 in den Prozeßbehälter 2 portionsweise eingefüllten UO₂-Pulvers. Wenn die Summe dieser Massen einen vorgegebenen Grenzwert erreicht, hebt die Sicherheitsvorrichtung die Blockierung des Förderwegs 16 auf, indem sie die Schaltvorrichtung 37 geschlossen hält und die Schaltvorrichtung 36 öffnet, wenn der Schalter 43 betätigt wird.This process is repeated accordingly until the process container 2 is sufficiently filled with powder. The safety device 31 adds up the masses of the UO 2 powder filled in portions from the metering device 13 via the conveying path 15 into the process container 2. When the sum of these masses reaches a predetermined limit value, the safety device releases the blocking of the conveying path 16 by keeping the switching device 37 closed and opening the switching device 36 when the switch 43 is actuated.

Das Dosiergefäß 13 fördert auf diese Weise über den Förderweg 16 zugeführtes, beispielsweise aus U/Pu-Mischoxid bestehendes Pulver in den Prozeßbehälter 2. Die Sicherheitsvorrichtung 31 summiert in einem diesem Förderweg 16 zugeordneten Komponentenspeicher und in dem Gesamtspeicher auch die Massen dieses in den Prozeßbehälter 2 portionsweise geförderten U/Pu-Mischoxidpulvers und legt die gemessenen Massen ab. Die Sicherheitsvorrichtung 31 blockiert schließlich wieder den Förderweg 16 durch Offenhalten der Schaltvorrichtung 37, wenn die Summe der Massen des über den Förderweg 16 geförderten U/Pu-Mischoxidpulvers einen vorgegebenen Grenzwert erreicht.In this way, the metering vessel 13 conveys powder, for example consisting of U / Pu mixed oxide, supplied via the conveying path 16 into the process container 2. The safety device 31 sums up in a component memory associated with this conveying path 16 and in the total memory also the masses of this into the process container 2 U / Pu mixed oxide powder conveyed in portions and deposits the measured masses. The safety device 31 finally blocks the conveying path 16 again by keeping the switching device 37 open when the sum of the masses of the U / Pu mixed oxide powder conveyed via the conveying path 16 reaches a predetermined limit value.

Die Sicherheitsvorrichtung 31 blockiert ferner die Fördervorrichtung 12 durch Öffnen der Schaltvorrichtungen 36 und 37, wenn die Summe der in dem Prozeßbehälter 2 eingefüllten Pulvermassen einen vorgegebenen Grenzwert erreicht.The safety device 31 also blocks the conveying device 12 by opening the switching devices 36 and 37 when the sum of the powder masses filled in the process container 2 reaches a predetermined limit value.

Nachdem der Verschlußkörper 6 im Einfüllstutzen 5 des Prozeßbehälters 2 in die Verschlußstellung mit quergestelltem Durchtrittskanal 7 gebracht worden ist, wird der Prozeßbehälter 2 um die durch das Lager 3 bestimmte Achse um 90° geschwenkt und der Prozeß, z.B. Mahlen oder Mischen des Pulvers im Prozeßbehälter, durchgeführt.After the closure body 6 in the filler neck 5 of the process container 2 has been brought into the closed position with the transverse passage 7, the process container 2 is pivoted through 90 ° about the axis determined by the bearing 3 and the process, e.g. Grinding or mixing of the powder in the process container carried out.

Hierauf wird der Prozeßbehälter 2 um die durch das Lager 3 bestimmte Achse um weitere 90° geschwenkt und mit dem Einfüllstutzen 5 an den Einfülltrichter 24 des Aufnahmebehälters 23 angedockt. Nachdem der Verschlußkörper 6 wieder in die Entleerstellung mit vertikalem Durchtrittskanal 7 gebracht wurde, rieselt das Pulver aus dem Prozeßbehälter 2 in den Aufnahmebehälter 23.Then the process container 2 is pivoted about the axis determined by the bearing 3 by a further 90 ° and is docked with the filler neck 5 to the hopper 24 of the receptacle 23. After the closure body 6 has been brought back into the emptying position with the vertical passage channel 7, the powder trickles out of the process container 2 into the receiving container 23.

Schließlich wird der Verschlußkörper 6 wieder in die Verschlußstellung gebracht und der Prozeßbehälter 2 um die durch das Lager 3 bestimmte Achse in die in Figur 1 dargestellte Ausgangsstellung geschwenkt.Finally, the closure body 6 is brought back into the closed position and the process container 2 is pivoted about the axis determined by the bearing 3 into the starting position shown in FIG.

Die Erkennungsvorrichtung 21 für die Entleerstellung des Prozeßbehälters 2 hatte zuvor Signal auf den Eingang der Sicherheitsvorrichtung 31 gegeben, und diese Sicherheitsvorrichtung 31 vergleicht die mit der Waage 22 bestimmte Masse des im Aufnahmegefäß 23 befindlichen Pulvers mit der im Gesamtspeicher der Sicherheitsvorrichtung 31 abgelegten Masse. Sie öffnet die Schaltvorrichtungen 36 und 37 unter Blockierung der Fördervorrichtung 12, wenn die im Aufnahmebehälter 23 gemessene Pulvermasse von der Summe der Pulvermassen der in den Prozeßbehälter 2 mit dem Dosiergefäß 13 beförderten Einzelportionen um einen vorgegebenen Wert oder mehr differiert.The detection device 21 for emptying the process container 2 had previously given a signal to the input of the safety device 31, and this safety device 31 compares the mass of the powder located in the receptacle 23 with the scale 22 with the mass stored in the total memory of the safety device 31. It opens the switching devices 36 and 37 blocking the conveying device 12 when the one measured in the receptacle 23 Powder mass differs from the sum of the powder masses of the individual portions conveyed into the process container 2 with the metering vessel 13 by a predetermined value or more.

Der Prozeßbehälter 2 kann mehrfach befüllt und mehrfach in den Aufnahmebehälter 23 entleert werden. Die Sicherheitsvorrichtung 31 öffnet die Schaltvorrichtung 35 unter Blockierung des Schwenkmotors 4, wenn entweder die von der Waage 22 im Aufnahmebehälter 23 gemessene Pulvermasse einen vorgegebenen Grenzwert erreicht oder überschreitet oder wenn die durch die Signale der Erkennungsvorrichtung 21 für die Entleerstellung des Prozeßbehälters 2 von der Sicherheitsvorrichtung 31 gezählten Entleerungen des Prozeßbehälters 2 in den Aufnahmebehälter 23 einen vorgegebenen Wert erreicht.The process container 2 can be filled several times and emptied several times into the receiving container 23. The safety device 31 opens the switching device 35 by blocking the swivel motor 4 when either the powder mass measured by the scale 22 in the receptacle 23 reaches or exceeds a predetermined limit value or when the signals from the detection device 21 for emptying the process container 2 from the safety device 31 counted empties of the process container 2 in the receiving container 23 reaches a predetermined value.

Claims (6)

  1. Apparatus for the mechanical processing of powder, in particular nuclear fuel powder, in a processing vessel (2), in particular a mill or mixer, having a metering vessel (13) associated with the processing vessel (2), a powder feed device (12) opening into the metering vessel (13), and a collecting vessel (23) into which the contents of the processing vessel (2) can be evacuated,
    characterised in that
    a) a first weighing device (8) is allocated to the metering vessel (13), which is provided with a sealable evacuating aperture (13b) insertable into the processing vessel,
    b) a second weighing device (22) is allocated to the collecting vessel (23),
    c) a first sensor (19) is allocated to the first weighing device (8) in order to detect when the weighing device (8) is ready to weigh,
    d) a second sensor (18), which detects the closed position of the evacuating aperture (13b), is allocated to the metering vessel (13),
    e) a safety device (31) is provided which is connected by its signal input to the first (8) and to the second weighing device (22) as well as to the first (19) and to the second sensor (18), and by its signal output to the powder feed device (12),
    f) the safety device (31) evaluates the powder mass measured by the first weighing device (8) if simultaneously the first sensor (19) indicates readiness to weigh and the second sensor (18) indicates a closed evacuating aperture,
    g) the safety device (31) adds up the powder masses measured by the first weighing device (8) and fed from the metering vessel (13) in individual portions into the processing vessel (2), and
    h) the safety device (31) blocks the feed device (12) if the sum of the powder masses of the individual portions fed from the metering vessel (13) reaches a specified first limit value, or if the powder mass measured in the collecting vessel (23) after evacuation of the processing vessel (2) differs by a specified value or more from the sum of the powder masses of the individual portions fed into the processing vessel (2).
  2. Apparatus according to claim 1,
    characterised in that the powder feed device (12) has at least two feed channels (15 and 16),
    in that a third sensor (39a; 40a) for detecting which feed channel is switched to the metering vessel is allocated to the powder feed device (12),
    in that the safety device (31) is connected by its signal input to the third sensor (39a; 40a) and by its signal output to the powder feed device (12), and
    in that, if the first feed channel (15) is switched to the metering vessel (13), the safety device (31) either blocks a second feed channel (16) to the metering vessel (13) if the first feed channel (15) is left closed, or blocks the first feed channel (15) or the entire feed device (12) if the first feed channel (15) is not left closed.
  3. Apparatus according to claim 2,
    characterised in that the safety device (31) cancels blocking of the second feed channel (16) if the sum of the powder masses fed via the first feed channel (15) into the processing vessel (2) reaches or exceeds a specified second limit value smaller than the first limit value.
  4. Apparatus according to claim 3,
    characterised in that the safety device (31) blocks the second feed channel (16) again if the sum of the powder masses fed via the second feed channel (16) into the processing vessel (2) reaches a specified third limit value smaller than the first limit value.
  5. Apparatus according to claim 1,
    characterised in that the safety device (31) is connected by its signal output to a device (35) which blocks evacuation of the processing vessel (2) into the collecting vessel (23) if the powder mass in the collecting vessel (23) measured by the second weighing device (22) reaches a specified fourth limit value.
  6. Apparatus according to claim 1,
    characterised in that the safety device (31) is connected by its signal input to a sensor (21) for detecting the number of evacuations of the processing vessel (2) into the collecting vessel (23) and by its signal output to a device which blocks evacuation of the processing vessel (2) into the collecting vessel (23) if the number of evacuations reaches a specified value.
EP92114423A 1991-09-06 1992-08-24 Device for mechanically treating powder especially nuclear combustion powder Expired - Lifetime EP0530636B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4129652A DE4129652A1 (en) 1991-09-06 1991-09-06 DEVICE FOR MECHANICALLY PROCESSING POWDER, IN PARTICULAR CORE FUEL POWDER
DE4129652 1991-09-06

Publications (2)

Publication Number Publication Date
EP0530636A1 EP0530636A1 (en) 1993-03-10
EP0530636B1 true EP0530636B1 (en) 1995-06-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92114423A Expired - Lifetime EP0530636B1 (en) 1991-09-06 1992-08-24 Device for mechanically treating powder especially nuclear combustion powder

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EP (1) EP0530636B1 (en)
JP (1) JP3129852B2 (en)
DE (2) DE4129652A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2036097A1 (en) * 2006-06-15 2009-03-18 Belgonucleaire SA Criticality prevention devices and methods in nuclear fuel production
CN104526861A (en) * 2014-12-23 2015-04-22 江苏金石研磨有限公司 Automatic feeding and water adding system for ceramic rolling forming

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2073652A (en) * 1936-03-12 1937-03-16 John F Robb Central mixing plant
DE1683758A1 (en) * 1967-05-03 1971-09-09 Atlas Mak Maschb Gmbh Device for feeding sand and lime to a premixer for the manufacture of sand-lime blocks
DE2034837C3 (en) * 1970-07-14 1973-12-06 Bruno Meyer Spezialmaschinen- Und Wiegeapparatebau Gmbh, 5202 Hennef Device for the discontinuous production of mixtures of fine to coarse-grained bulk materials
DE2247518C3 (en) * 1972-09-28 1975-04-30 Werner & Pfleiderer, 7000 Stuttgart mixer
DE3834191A1 (en) * 1988-10-07 1990-04-12 Brockhues Chem Werke Ag Device and method for the automatic dosing of dry pigments into a concrete or mortar mixer

Also Published As

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JP3129852B2 (en) 2001-01-31
DE59202600D1 (en) 1995-07-27
EP0530636A1 (en) 1993-03-10
DE4129652A1 (en) 1993-03-11
JPH05249285A (en) 1993-09-28

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