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EP0098371B1 - Dispositif pour déshydrater et rendre plastiques des mélanges d'explosifs - Google Patents

Dispositif pour déshydrater et rendre plastiques des mélanges d'explosifs Download PDF

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Publication number
EP0098371B1
EP0098371B1 EP83104884A EP83104884A EP0098371B1 EP 0098371 B1 EP0098371 B1 EP 0098371B1 EP 83104884 A EP83104884 A EP 83104884A EP 83104884 A EP83104884 A EP 83104884A EP 0098371 B1 EP0098371 B1 EP 0098371B1
Authority
EP
European Patent Office
Prior art keywords
water
screw extruder
conveyor
discharge channel
screw
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
Application number
EP83104884A
Other languages
German (de)
English (en)
Other versions
EP0098371A3 (en
EP0098371A2 (fr
Inventor
Dietmar Dr. Dipl.- Chem. Müller
Hiltmar Dr. Dr. Rer. Nat. Schubert
Rudolf Kröhnert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Priority to AT83104884T priority Critical patent/ATE32056T1/de
Publication of EP0098371A2 publication Critical patent/EP0098371A2/fr
Publication of EP0098371A3 publication Critical patent/EP0098371A3/de
Application granted granted Critical
Publication of EP0098371B1 publication Critical patent/EP0098371B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
    • C06B21/0033—Shaping the mixture
    • C06B21/0075—Shaping the mixture by extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing

Definitions

  • the invention relates to a device for dewatering and plasticizing water-moist explosive mixtures, e.g. Powder raw materials, by means of a screw extruder with one or more screw shafts with kneading and conveying elements, a housing, possibly made up of axial sections, with a filling opening for the water-moist explosive mixture and an outlet opening arranged in its area, starting from the interior of the screw extruder, and a subsequent outlet channel for the water.
  • a device for dewatering and plasticizing water-moist explosive mixtures e.g. Powder raw materials
  • a housing possibly made up of axial sections, with a filling opening for the water-moist explosive mixture and an outlet opening arranged in its area, starting from the interior of the screw extruder, and a subsequent outlet channel for the water.
  • Explosive mixtures e.g. fibrous powder raw materials consisting of nitrocellulose and nitroglycerin, but also peroxide-containing materials are processed in a water-moist state for safety reasons, e.g. plasticized.
  • Dewatering and plasticizing are mostly carried out today with screw extruders (DE-B 28 25 567, DE-A 30 44 577), which not only enable continuous work, but also perfect processing by using defined screw geometries and a defined temperature profile over the length of the screw extruder enable. It is known to work with single or multi-shaft extruders.
  • the screw shafts usually have alternating conveying sections and kneading sections in the axial direction, the water being squeezed out of the mass and the solid material being plasticized at the same time.
  • the water collects in the feed area, where the unprocessed material is metered in.
  • the slurry can run out in the feed area and, due to its nitroglycerin content, can pose a safety risk.
  • the first-mentioned disadvantage can be remedied in the known device forming the preamble of claim 1 (for example from DE-A-2446021) in that a suction nozzle for suctioning the water is arranged in the region of the filling opening.
  • the invention is based on the object of designing a screw extruder of the construction described at the outset in such a way that on the one hand no slurries occur in the feed area and on the other hand the formulation of the plasticized material is not falsified.
  • This object is achieved in that the drain opening widens from the interior to the drain channel and in that a conveyor for removing the solids contained in the squeezed water is arranged.
  • the conveyor is a screw coil, e.g. formed from a thick steel wire, thereby avoiding that a noteworthy pressure is exerted on the solid particles in the drainage channel even if they accumulate in large quantities.
  • a noteworthy pressure is exerted on the solid particles in the drainage channel even if they accumulate in large quantities.
  • clogging of the drainage channel is practically impossible.
  • the measures according to the invention can also be supported in that the drainage channel is under negative pressure, which at the same time ensures that the draining mass cannot escape due to any leaks that may be present.
  • a particularly advantageous embodiment of the invention is characterized in that the discharge channel is arranged approximately parallel to the axis of the screw extruder and opens out at the rear end of the housing.
  • This embodiment has the advantage that any heating ducts that are also generally axially parallel are not disturbed in their arrangement by the outlet duct.
  • the drain channel is formed by a tube open on the circumferential side to the drain opening, which is inserted into an axially parallel bore in the housing and receives the conveyor in its interior.
  • a container for holding the water-solid mixture is expediently connected to the tube outside the housing.
  • the container can optionally also serve to separate the solid particles.
  • the drive of the conveyor is derived from the drive of the worm shafts.
  • the conveyor is, for example, a screw helix
  • a gear member reversing the direction of rotation is arranged between the drive shaft and the worm shafts. So while the screws of the extruder work in one direction, the screw shaft conveys the drainage material in the opposite direction back to the rear end of the housing.
  • the derivation of the drive from the drive of the screw extruder has the advantage that no special explosion protection measures are necessary for driving the screw helix, but rather are ensured by the explosion protection of the drive of the screw extruder that is necessary anyway.
  • a screw extruder 1 which can be designed as a single or multi-screw extruder.
  • the screw extruder 1 has a housing 2, which is optionally made up of a plurality of axial sections, of which the drawing shows the first section 3 in the feed direction of the screw extruder.
  • a radially extending filling opening 4 is arranged in this feed region.
  • the drive shaft 6 is led into the interior 7 through the rear end face 5 of the housing. There it has a conveying section in the form of a screw 8, which exerts only a small pressing effect on the metered material.
  • the apex 9 of the screw flight is designed as a sealing profile, while the screw base 10 has a concave shell shape.
  • the worm shaft 6 is driven by an explosion-proof drive 11, not shown in detail. It is preferably a double-shaft extruder, the second shaft being located in front of or behind the screw shaft 6. This can be the same or the opposite.
  • the housing 2 is provided in its rear section 3 with a drain opening 12 which is approximately opposite the filling opening 4 in its front area.
  • the drain opening 12 has an outwardly conically widening wall 13 and opens into a cylindrical drain channel 14 which runs axially parallel to the screw shafts 6 and extends from the rear end face 5 of the housing section 3.
  • a conveying element 15 in the form of a screw spiral is arranged within the outlet channel 14 and is driven at its outer end via a gear member 16 by the drive 11 of the screw shafts in a direction opposite to the direction of rotation of the screw, i.e. the helical coil 15 conveys the water reaching the drain channel 14 through the drain opening 12 with the solid particles to the rear.
  • the drain channel 14 is formed by a tube 17 which is inserted into an axially parallel bore 18 in the housing section 3.
  • the conveyor 15 is in turn arranged in the form of a helical coil within the tube.
  • the tube 17 has at its end in the housing a peripheral opening 19 which, when inserted, lies approximately below the drain opening 12.
  • the tube 17 is tightly connected outside the housing 2 of the screw extruder 1 to a collecting container 19 ', through which the drive shaft 20 of the screw coil is passed.
  • the collecting container 19 ' can optionally be under negative pressure, which is generated, for example, by an oil or water jet pump.
  • the device according to the invention can work with an appropriate length and corresponding structure of the individual sections of the screws as an extruder, that is to say for the immediate production of one or more extruded profiles from the water-moist mass, or can only work as a screw press with a short process length, the dewatered and plasticized product is further processed in subsequent process stages.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Processing Of Solid Wastes (AREA)
  • Treatment Of Sludge (AREA)

Claims (8)

1. Dispositif pour déshydrater et plastifier les mélanges explosifs humides par exemple les masses de poudre brute, au moyen d'une extrudeuse à vis (1) comportant un ou plusieurs arbres à vis (6) pourvus d'éléments de transport et de malaxage (8), d'un corps constitué éventuellement de plusieurs sections axiales avec un orifice de remplissage (4) pour le mélange explosif humide et un orifice d'évacuation (12) disposé dans la même zone et partant de l'enceinte intérieure (7) de l'extrudeuse à vis ainsi qu'un canal d'évacuation (14) pour l'eau qui y est raccordé, caractérisé en ce que l'orifice d'évacuation (12) s'élargit depuis l'enceinte intérieure (7) vers le canal d'évacuation (14) et en ce qu'un transporteur (15) est disposé dans celui-ci pour évacuer les matières solides contenues dans l'eau, éliminée par compression.
2. Dispositif selon la revendication 1, caractérisé en ce que le transporteur est constitué d'une spire hélicoïdale (15).
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le canal d'évacuation (1-4) est mis en dépression.
4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que le canal d'évacuation (14) est disposé à peu près parallèlement à l'axe d'extrudeuse à vis (1) et débouche dans la face frontale postérieure (5) du corps (2).
5. Dispositif selon une des revendications 1 à 4, caractérisé en ce que le canal d'évacuation (14) est constitué d'un tube (17) ouvert à la périphérie vers l'orifice d'évacuation (12) et qui est inséré dans un alésage (18) du corps (2) parallèle à l'axe et qui reçoit dans son enceinte intérieure le transporteur (15).
6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que un récipient (19) destiné à collecter le mélange d'eau et de matière solide est raccordé au tube (17) en dehors du corps (2).
7. Dispositif selon l'une des revendications 1 à 6, caractérisé en ce que la transmission du transporteur (15) est raccordée à la transmission (11) de l'arbre à vis (6) de l'extrudeuse (1).
8. Dispositif selon les revendications 2 et 7, caractérisé en ce que une transmission (16) inversant le sens de rotation est disposée entre l'arbre à vis (6) et l'arbre de transmission (20) de la spire hélicoïdale (15).
EP83104884A 1982-07-05 1983-05-18 Dispositif pour déshydrater et rendre plastiques des mélanges d'explosifs Expired EP0098371B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83104884T ATE32056T1 (de) 1982-07-05 1983-05-18 Vorrichtung zum entwaessern und plastifizieren von explosivstoffgemischen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3225065 1982-07-05
DE3225065A DE3225065C1 (de) 1982-07-05 1982-07-05 Vorrichtung zum Entwaessern und Plastifizieren von Explosivstoffgemischen

Publications (3)

Publication Number Publication Date
EP0098371A2 EP0098371A2 (fr) 1984-01-18
EP0098371A3 EP0098371A3 (en) 1985-09-11
EP0098371B1 true EP0098371B1 (fr) 1988-01-20

Family

ID=6167651

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83104884A Expired EP0098371B1 (fr) 1982-07-05 1983-05-18 Dispositif pour déshydrater et rendre plastiques des mélanges d'explosifs

Country Status (4)

Country Link
US (1) US4493630A (fr)
EP (1) EP0098371B1 (fr)
AT (1) ATE32056T1 (fr)
DE (2) DE3225065C1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3500067C2 (de) * 1985-01-03 1986-10-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Verfahren zur Herstellung verbrennbarer Hülsen auf Nitrozellulose-Basis als Munitionsformteil für Rohrwaffen
DE3546489A1 (de) * 1985-01-03 1987-08-13 Fraunhofer Ges Forschung Vorrichtung zur herstellung verbrennbarer huelsen auf nitrozellulose-basis als munitionsformteil fuer rohrwaffen
GB8513948D0 (en) * 1985-06-03 1985-07-03 Hampton Gay S Ltd Removing liquid
US5143699A (en) * 1988-07-05 1992-09-01 Werner & Pfleiderer Corp. Mixing apparatus
RU2203256C2 (ru) * 2000-10-17 2003-04-27 Государственный научно-исследовательский институт химических продуктов Способ обезвоживания нитратов целлюлозы
DE102007051923B4 (de) * 2007-10-29 2011-03-10 Troester Gmbh & Co. Kg Vorrichtung und Verfahren zur Verarbeitung polymerer Werkstoffe

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB110035A (en) * 1916-10-16 1917-10-11 John Clarkson Fiddyment Improvements in and relating to Power Presses for Extracting Fluids from Vegetable Matter or other Material.
FR637146A (fr) * 1926-10-29 1928-04-24 Pressoirs Mabille Perfectionnements aux fouloirs-égrappoirs
US2615199A (en) * 1945-05-15 1952-10-28 Welding Engineers Material treating apparatus
DE1048212B (de) * 1957-08-09 1958-12-31 Dynamit Nobel Ag Vorrichtung zur kontinuierlichen Herstellung von Schiesspulvern und Treibsaetzen
US2961701A (en) * 1958-08-01 1960-11-29 Welding Engineers Extrusion apparatus
NL258615A (fr) * 1959-12-01 1900-01-01
DE1779922A1 (de) * 1961-02-17 1972-01-13 Internat Basic Economy Corp Vorrichtung zum Entfernen von Fluessigkeit aus Elastomeren
US3375549A (en) * 1961-04-05 1968-04-02 Uniroyal Inc Method and apparatus for refining and separating plastic materials
US3371379A (en) * 1965-01-02 1968-03-05 Reifenhauser K G Apparatus for degassing thermoplastic material in screw presses
US3535737A (en) * 1967-07-28 1970-10-27 Borg Warner Plasticizing apparatus with volatile withdrawal system
US3523331A (en) * 1968-07-30 1970-08-11 Du Pont Canada Heated extrusion vent port monitoring window
SE424545B (sv) * 1973-09-26 1982-07-26 Bofors Ab Sett att framstella ett strengformat krut
DE2645312A1 (de) * 1976-10-07 1978-04-13 Geb Piskunova Sofia Borovikova Plastizierungsbaugruppe in der anlage zur verarbeitung von polymermaterialien
GB1524088A (en) * 1976-10-07 1978-09-06 Borovikova S M Lurie E V Machines for processing polymer compositions by melting
DE3013091A1 (de) * 1980-04-03 1981-10-08 Dambach-Industrieanlagen Gmbh, 7560 Gaggenau Vorrichtung zum entwaessern und verdichtung von rechengut, muell o.dgl.
DE3044577C2 (de) * 1980-11-26 1982-11-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Verfahren und Vorrichtung zur kontinuierlichen Herstellung von Treibladungspulver

Also Published As

Publication number Publication date
EP0098371A3 (en) 1985-09-11
DE3225065C1 (de) 1983-12-15
US4493630A (en) 1985-01-15
DE3375388D1 (en) 1988-02-25
ATE32056T1 (de) 1988-02-15
EP0098371A2 (fr) 1984-01-18

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