EP0215015B1 - Plant for projecting particles of carbon dioxide ice - Google Patents

Plant for projecting particles of carbon dioxide ice Download PDF

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Publication number
EP0215015B1
EP0215015B1 EP86901083A EP86901083A EP0215015B1 EP 0215015 B1 EP0215015 B1 EP 0215015B1 EP 86901083 A EP86901083 A EP 86901083A EP 86901083 A EP86901083 A EP 86901083A EP 0215015 B1 EP0215015 B1 EP 0215015B1
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EP
European Patent Office
Prior art keywords
particles
metering device
outlet
plant
plant according
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
EP86901083A
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German (de)
French (fr)
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EP0215015A1 (en
Inventor
Claude Gibot
Jean-Michel Charles
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Carboxyque Francaise SA
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Carboxyque Francaise SA
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Priority to AT86901083T priority Critical patent/ATE42233T1/en
Publication of EP0215015A1 publication Critical patent/EP0215015A1/en
Application granted granted Critical
Publication of EP0215015B1 publication Critical patent/EP0215015B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier

Definitions

  • the present invention relates to a sandblasting installation, that is to say installation of the type described in the preamble of claim 1.
  • sandblasting is similar to sandblasting and shot blasting processes, but sand or shot is replaced by particles or grains of dry ice yes, after having fulfilled their abrasive function, sublimate.
  • the object of the invention is to provide an installation making it possible to obtain a regular flow of particles in the carrier gas line.
  • the invention relates to an installation of the aforementioned type according to the characterizing part of claim 1.
  • the sandblasting installation shown in the drawing essentially comprises a crusher 1, means 2 for feeding this crusher, a metering device 3, a carrier gas line 4 equipped with a propellant device 5, and a metal cover 6 for protection. against humidity.
  • the elements 1 to 5 of the installation are mounted on a metal frame (not shown) fixed to the ground 7, the latter also carrying the cover 6.
  • the crusher 1 is a pin crusher. It has an upper feed hopper 8 open upwards and a lower outlet duct 9 open downwards.
  • the supply means 2 comprise a conveyor belt 10, and a vibrating chute 11 which can be raised by means of a jack 12 and the outlet of which is located above the hopper 8.
  • the metering device 3 comprises a particle reservoir 11 provided at its lower end with an approximately horizontal outlet tube 12.
  • a screw spring 13 coaxial with the latter passes through the lower part of the reservoir 11 and extends to the open outlet end 14 of the tube 12.
  • a motor 15 rotates the screw 13 as well as stirring blades 16 also contained in the tank.
  • Another their 17 comprises an output shaft 18 whose end is forked and penetrates coaxially, through the opening 14, inside the end part of the screw 13.
  • the reservoir 11 is connected via a flexible section 19 to a vibrating hopper 20 which overcomes it.
  • the inlet opening of the latter is coaxial with the outlet 9 of the mill but is spaced therefrom, that is to say that no contact exists between the mill and the hopper 20.
  • Line 4 comprises an upstream pipe 21 connected to a source of carrier gas, in particular C0 2 gaseous under pressure (not shown), and a downstream pipe 22 constituted by a hose without internal roughness ending in a rigid lance tube 23; the pipes 21 and 22 of the pipe are connected by the propellant device 5, which is best seen in FIG. 2.
  • a source of carrier gas in particular C0 2 gaseous under pressure (not shown)
  • a downstream pipe 22 constituted by a hose without internal roughness ending in a rigid lance tube 23; the pipes 21 and 22 of the pipe are connected by the propellant device 5, which is best seen in FIG. 2.
  • the device 5 comprises a T-connector whose shank, directed upwards, is extended by an inlet funnel 24.
  • the lower outlet branch of the T is directly connected to the hose 22, while its lower inlet branch is connected to the pipe 21 via an ejector.
  • the latter consists of a nozzle 25 having a large inlet bore 26 and a small outlet bore 27.
  • the first bore is threaded and screws onto the end of the pipe 21, and in the second bore is fixed the upstream end of an ejection nozzle 28 whose downstream end is on the axis of the funnel 24.
  • the inlet edge of this funnel is located under the outlet opening 14 of the tube 12, but is spaced from this tube, that is to say without any contact with it.
  • the cover 6 surrounds all of the elements of the installation, apart from the upper hopper 8 and the flexible 22, which pass through it with an approximate seal, and the supply device 2, which is entirely external to the cover.
  • a machine for producing pieces of dry ice pours these pieces on the upstream end (not visible in the drawing) of the belt 10.
  • These pieces are for example sticks having a diameter of the order 15 mm and a length of the order of 25 mm. Such sticks can be produced very reliably but are too large to be used directly in sandblasting.
  • the belt 10 pours by gravity the pieces of dry ice into the chute 11, supposed in the lowered active position, from where they fall by gravity into the hopper 8 of the crusher 1. In this one, the pieces are transformed into small very small particles. angular whose dimension varies for example, for a given application, from 0.5 mm to 1.5 mm approximately. These particles fall by gravity into the vibrating hopper 20 and are stirred by the blades 16.
  • the screw-spring 13 is rotated so as to extract a given flow of particles through the opening 14 of the tube 12.
  • the rotation in opposite direction of the shaft 18 makes it possible to avoid the formation of bundles of particles, corresponding to the not of the spring, at the opening 14.
  • a regular flow of particles slides by gravity in the funnel 24.
  • the carrier gas ejected at high speed through the nozzle 28 creates a depression in the funnel 24 which causes the particles to be entrained in the gas stream, by venturi effect.
  • the particle ejection rate through the tube 23 is regulated by the speed of rotation of the spring screw 13.
  • the pin plates of the mill are chosen and their speed of rotation so as to obtain, on the one hand, the average particle size desired for the particles, which can vary by temple between 1 and 4 mm, on the other hand a ground flow somewhat higher than the ejection flow; the feed to the mill is intermittent and is controlled by raising or lowering the chute 11 by the jack 12, depending on the level of particles in the hopper 20.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Disintegrating Or Milling (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Cleaning In General (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)

Abstract

The plant comprises three units separate from each other; a crusher (1) supplied with lumps of carbon dioxide ice, a doser (3) with extraction screw-spring (13), and a propulsion device (5) mounted in a carrier gas conduit (4). The assembly is kept in a CO2 atmosphere by a hood (6). Application to the scraping of surfaces in the nuclear industry.

Description

La présente invention est relative à une installation de carbosablage, c'est-à-dire installation dy type décrit dans le préambule de la revendication 1.The present invention relates to a sandblasting installation, that is to say installation of the type described in the preamble of claim 1.

Comme on le sait, la détente de l'anhydride carbonique (C02) liquide produit de la neige carbonique, laquelle peut être compactée pour former des morceaux de glace carbonique oui se subliment en se réchauffant. Les installations du type précité fournissent un débit dosé de petites particules de glace carbonique (ayant une dimension de l'ordre de 1 à 4 mm environ) dans la conduite de gaz vecteur, ce qui permet de projeter les particules sur une surface à décaper.As is known, the expansion of liquid carbon dioxide (C0 2 ) produces carbon dioxide snow, which can be compacted to form pieces of dry ice or sublime as it warms up. Installations of the aforementioned type provide a metered flow rate of small dry ice particles (having a size of the order of approximately 1 to 4 mm) in the carrier gas line, which makes it possible to project the particles onto a surface to be stripped.

Ainsi, le carbosablage s'apparente aux procédés de sablage et de grenaillage, mais le sable ou la grenaille est remplacé par des particules ou grains de glace carbonique oui, après avoir rempli leur fonction abrasive, se subliment.Thus, sandblasting is similar to sandblasting and shot blasting processes, but sand or shot is replaced by particles or grains of dry ice yes, after having fulfilled their abrasive function, sublimate.

Cette technique trouve son domaine d'application partout où des effluents de traitement du type liquide ou solide seraient contaminés ou irrécupérables sur le site de traitement. Dans les applications nucléaires par exemple, le traitement par jets d'eau pose des problèmes, l'eau ayant une radioactivité résiduaire, tandis que le sable se contamine et doit être enterré; au contraire, le C02 gazeux, comme la plupart des gaz, peut être aisément décontmainé par filtration.This technique finds its field of application wherever treatment effluents of the liquid or solid type are contaminated or irrecoverable on the treatment site. In nuclear applications for example, treatment by water jets poses problems, water having residual radioactivity, while sand becomes contaminated and must be buried; on the contrary, C0 2 gas, like most gases, can be easily decontaminated by filtration.

Cependant, les installations de carbosablage connues du type précité (FR-A-2 285 961) n'ont pas donné entière satisfaction, notamment du fait de la tendance à la prise en masse des particules de glace carbonique, due à l'electricité statique, ce qui rend irrégulier le débit des particules projetées sur la surface à traiter.However, known sandblasting installations of the aforementioned type (FR-A-2 285 961) have not been entirely satisfactory, in particular due to the tendency for solidification of the particles of dry ice, due to static electricity. , which makes the flow of particles projected onto the surface to be irregular.

L'invention a pour but de fournir une installation permettant d'obtenir un débit régulier de particules dans la conduite de gaz vecteur. A cet effet l'invention a pour objet une installation du type précité selon la partie caractérisante de la revendication 1.The object of the invention is to provide an installation making it possible to obtain a regular flow of particles in the carrier gas line. To this end the invention relates to an installation of the aforementioned type according to the characterizing part of claim 1.

Suivant d'autres caractéristiques avantageuses de l'invention:

  • - le dispositif doseur laisse à son tour tomber lesdites particules par gravité dans le dispositif propulseur, lequel est espacé du dispositif doseur, le capot entourant la sortie dudit appareil, le dispositif doseur et le dispositif propulseur;
  • - ledit appareil comprend un broyeur et des moyens d'alimentation de ce broyeur en morceaux de glace carbonique.
According to other advantageous features of the invention:
  • - The metering device in turn drops said particles by gravity into the propellant device, which is spaced from the metering device, the cover surrounding the outlet of said device, the metering device and the propellant device;
  • - Said apparatus comprises a crusher and means for supplying this crusher with pieces of dry ice.

Un exemple de réalisation de l'invention va maintenant être décrit en regard du dessin annexé, sur lequel:

  • - la figure 1 représente schematiquement en élévation, avec coupe partielle, une installation de carbosablage conforme à l'invention; et
  • - la figure 2 représente en coupe longitudinale, à plus grande échelle, le dispositif propulseur de cette installation.
An exemplary embodiment of the invention will now be described with reference to the attached drawing, in which:
  • - Figure 1 shows schematically in elevation, with partial section, a sandblasting installation according to the invention; and
  • - Figure 2 shows in longitudinal section, on a larger scale, the propellant device of this installation.

L'installation de carbosablage représentée au dessin comprend essentiellement un broyeur 1, des moyens 2 d'alimentation de ce broyeur, un dispositif doseur 3, une conduite de gaz vecteur 4 équipée d'un dispositif propulseur 5, et un capot métallique 6 de protection contre l'humidité. Les éléments 1 à 5 de l'installation sont montés sur un châssis métallique (non représenté) fixé au sol 7, ce dernier portant également le capot 6.The sandblasting installation shown in the drawing essentially comprises a crusher 1, means 2 for feeding this crusher, a metering device 3, a carrier gas line 4 equipped with a propellant device 5, and a metal cover 6 for protection. against humidity. The elements 1 to 5 of the installation are mounted on a metal frame (not shown) fixed to the ground 7, the latter also carrying the cover 6.

Le broyeur 1 est un broyeur à broches. Il possède une trémie supérieure d'alimentation 8 ouverte vers le haut et un conduit de sortie inférieur 9 ouvert vers le bas.The crusher 1 is a pin crusher. It has an upper feed hopper 8 open upwards and a lower outlet duct 9 open downwards.

Les moyens d'alimentation 2 comprennent une courroie transporteuse 10, et une goulotte vibrante 11 relevable au moyen d'un vérin 12 et dont la sortie se trouve au-dessus de la trémie 8.The supply means 2 comprise a conveyor belt 10, and a vibrating chute 11 which can be raised by means of a jack 12 and the outlet of which is located above the hopper 8.

Le dispositif doseur 3 comprend un réservoir de particules 11 pourvu à son extrémité inférieure d'un tube de sortie 12 à peu près horizontal. Une vis-ressort 13 coaxiale à ce dernier traverse la partie inférieure du réservoir 11 et s'étend jusqu'à l'extrémité de sortie ouverte 14 du tube 12. Un moteur 15 entraîne en rotation la vis 13 ainsi que des pales de brassage 16 également contenues dans le réservoir. Un autre leur 17 comporte un arbre de sortie 18 dont l'extrémité est fourchue et pénètre coaxialement, par l'ouverture 14, à l'intérieur de la partie d'extrémité de la vis 13.The metering device 3 comprises a particle reservoir 11 provided at its lower end with an approximately horizontal outlet tube 12. A screw spring 13 coaxial with the latter passes through the lower part of the reservoir 11 and extends to the open outlet end 14 of the tube 12. A motor 15 rotates the screw 13 as well as stirring blades 16 also contained in the tank. Another their 17 comprises an output shaft 18 whose end is forked and penetrates coaxially, through the opening 14, inside the end part of the screw 13.

Le réservoir 11 est relié par l'intermédiaire d'un tronçon souple 19 à une trémie vibrante 20 qui le surmonte. L'ouverture d'entrée de cette dernière est coaxiale au conduit 9 de sortie du broyeur mais en est espacée, c'est-à-dire qu'aucun contact n'existe entre le broyeur et la trémie 20.The reservoir 11 is connected via a flexible section 19 to a vibrating hopper 20 which overcomes it. The inlet opening of the latter is coaxial with the outlet 9 of the mill but is spaced therefrom, that is to say that no contact exists between the mill and the hopper 20.

La conduite 4 comprend un tuyau amont 21 relié à une source de gaz vecteur, notamment de C02 gazeux sous pression (non représentée), et un tuyau aval 22 constitué par un flexible sans aspérités intérieures se terminant par un tube- lance rigide 23; les tuyaux 21 et 22 de la conduite sont reliés par le dispositif propulseur 5, que l'on voit mieux à la figure 2.Line 4 comprises an upstream pipe 21 connected to a source of carrier gas, in particular C0 2 gaseous under pressure (not shown), and a downstream pipe 22 constituted by a hose without internal roughness ending in a rigid lance tube 23; the pipes 21 and 22 of the pipe are connected by the propellant device 5, which is best seen in FIG. 2.

Le dispositif 5 comprend un raccord en T dont la hampe, dirigée vers le haut, se prolonge par un entonnoir d'entrée 24. La branche inférieure de sortie du T est directement reliée au flexible 22, tandis que sa branche inférieure d'entrée est reliée au tuyau 21 par l'intermédiaire d'un éjecteur. Ce dernier est constitué d'un embout 25 ayant un grand alésage d'entrée 26 et un petit alésage se sortie 27. Le premier alésage est taraudé et se visse sur l'extrémité du tuyau 21, et dans le second alésage est fixée l'extrémité amont d'une buse d'éjection 28 dont l'extrémité aval se trouve sur l'axe de l'entonnoir 24. Le bord d'entrée de cet entonnoir se trouve sous l'ouverture de sortie 14 du tube 12, mais est espacé de ce tube, c'est-à-dire sans aucun contact avec lui.The device 5 comprises a T-connector whose shank, directed upwards, is extended by an inlet funnel 24. The lower outlet branch of the T is directly connected to the hose 22, while its lower inlet branch is connected to the pipe 21 via an ejector. The latter consists of a nozzle 25 having a large inlet bore 26 and a small outlet bore 27. The first bore is threaded and screws onto the end of the pipe 21, and in the second bore is fixed the upstream end of an ejection nozzle 28 whose downstream end is on the axis of the funnel 24. The inlet edge of this funnel is located under the outlet opening 14 of the tube 12, but is spaced from this tube, that is to say without any contact with it.

Le capot 6 entoure l'ensemble des éléments de l'installation, à part la trémie supérieure 8 et le flexible 22, qui le traversent avec une étanchéité approximative, et le dispositif d'alimentation 2, qui est entièrement extérieur au capot.The cover 6 surrounds all of the elements of the installation, apart from the upper hopper 8 and the flexible 22, which pass through it with an approximate seal, and the supply device 2, which is entirely external to the cover.

En fonctionnement, une machine (non représentée) de production de morceaux de glace carbonique déverse ces morceaux sur l'extrémité amont (non visible sur le dessin) de la courroie 10. Ces morceaux sont par exemple des bâtonnets ayant un diamètre de l'ordre de 15 mm et une longueur de l'ordre de 25 mm. De tels bâtonnets peuvent être produits de façon très fiable mais sont trop gros pour pouvoir être utilisés directement en carbosablage.In operation, a machine (not shown) for producing pieces of dry ice pours these pieces on the upstream end (not visible in the drawing) of the belt 10. These pieces are for example sticks having a diameter of the order 15 mm and a length of the order of 25 mm. Such sticks can be produced very reliably but are too large to be used directly in sandblasting.

Le courroie 10 déverse par gravité les morceaux de glace carbonique dans la goulotte 11, supposée en position active abaissée, d'où ils tombent par gravité dans la trémie 8 du broyeur 1. Dans celui-ci, les morceaux sont transformés en petites particules très anguleuses dont la dimension varie par exemple, pour une application donnée, de 0,5 mm à 1,5 mm environ. Ces particules tombent par gravité dans la trémie vibrante 20 et sont brassées par les pales 16.The belt 10 pours by gravity the pieces of dry ice into the chute 11, supposed in the lowered active position, from where they fall by gravity into the hopper 8 of the crusher 1. In this one, the pieces are transformed into small very small particles. angular whose dimension varies for example, for a given application, from 0.5 mm to 1.5 mm approximately. These particles fall by gravity into the vibrating hopper 20 and are stirred by the blades 16.

La vis-ressort 13 est entraînée en rotation de façon à extraire un débit donné de particules par l'ouverture 14 du tube 12. La rotation en sens inverse de l'arbre 18 permet d'éviter la formation de paquets de particules, correspondant au pas du ressort, à l'ouverture 14. Ainsi, un écoulement régulier de particules tobbe par gravité dans l'entonnoir 24.The screw-spring 13 is rotated so as to extract a given flow of particles through the opening 14 of the tube 12. The rotation in opposite direction of the shaft 18 makes it possible to avoid the formation of bundles of particles, corresponding to the not of the spring, at the opening 14. Thus, a regular flow of particles slides by gravity in the funnel 24.

Le gaz vecteur éjecté à grande vitesse par la buse 28 crée dans l'entonnoir 24 une dépression qui provoque l'entraînement des particules dans le veine gazeuse, par effet venturi.The carrier gas ejected at high speed through the nozzle 28 creates a depression in the funnel 24 which causes the particles to be entrained in the gas stream, by venturi effect.

Cette installation a donné toute satisfaction. De façon surprenante, on n'a constaté aucune prise en masse des particules dans la trémie 20 et le réservoir 11. Le débit de particules projetées est constant, et on a pu décaper dans de très bonnes conditions des tôles recouvertes de peintures à très forte adhérence: le métal réapparaît poli, sans dégradation de sa surface. De plus, la perte de C02, observée essentiellement au niveau du broyeur, est de l'ordre de 5 %, ce qui est tout à fait acceptable.This installation gave full satisfaction. Surprisingly, no solidification of the particles was observed in the hopper 20 and the reservoir 11. The flow of projected particles is constant, and it was possible to strip under very good conditions sheets coated with very strong paints. adhesion: the metal reappears polished, without degradation of its surface. In addition, the loss of CO 2 , observed essentially at the level of the mill, is of the order of 5%, which is entirely acceptable.

Par ailleurs, pendant la mise en froid de l'installation, la sublimation de la glace carbonique dégage du C02 gazeux sec, lequel, étant plus lourd que l'air, emplit progressivement le capot 6 en chassant l'air et l'humidité, jusqu'à déborder par une ouverture supérieure 29 du capot et, dans une moindre mesure, par les jeux de celui-ci, notament autour du flexible 22 et du broyeur 1. Ainsi, toutes les parties de l'installation dans lesquelles des particules de gaz carbonique sont exposées à l'atmosphère environnante (trémie 20, ouverture 14, entonnoir 24) sont maintenues sous atmosphère de C02 sec sous une pression voisine de la pression atmosphérique, ce qui exclut toute pénétration d'humidité au sein de des particules.Furthermore, during the cooling of the installation, the sublimation of the dry ice gives off dry gaseous C0 2 , which, being heavier than air, gradually fills the cover 6, expelling air and moisture , until overflowing through an upper opening 29 of the cover and, to a lesser extent, through the clearances thereof, in particular around the hose 22 and the crusher 1. Thus, all the parts of the installation in which particles carbon dioxide are exposed to the surrounding atmosphere (hopper 20, opening 14, funnel 24) are maintained under dry C0 2 atmosphere at a pressure close to atmospheric pressure, which excludes any penetration of moisture within particles .

De plus, la division de l'installation en trois sous-ensembles 1, 2 et 4 sans contact mutuel évite le développement de contraintes excessives d'origine thermique et permet d'intervenir facilement en cas de défaillance d'un élément.In addition, the division of the installation into three sub-assemblies 1, 2 and 4 without mutual contact avoids the development of excessive stresses of thermal origin and makes it possible to intervene easily in the event of an element failure.

En pratique, le débit d'éjection des particules par le tube 23 est réglé par la vitesse de rotation de la vis-ressort 13. On choisit les plateaux à broches du broyeur et leur vitesse de rotation de façon à obtenir d'une part la granulométrie moyenne voulue pour les particules, laquelle peut varier par temple entre 1 et 4 mm, d'autre part un débit broyé quelque peu supérieur au débit d'éjection; l'alimentation du broyeur est intermittente et est mommandée par relevage ou abaissement de la goulotte 11 par le vérin 12, en fonction du niveau de particules dans la trémie 20.In practice, the particle ejection rate through the tube 23 is regulated by the speed of rotation of the spring screw 13. The pin plates of the mill are chosen and their speed of rotation so as to obtain, on the one hand, the average particle size desired for the particles, which can vary by temple between 1 and 4 mm, on the other hand a ground flow somewhat higher than the ejection flow; the feed to the mill is intermittent and is controlled by raising or lowering the chute 11 by the jack 12, depending on the level of particles in the hopper 20.

En variante, pour des installations non permanentes, on peut remplacer l'ensemble machine de fabrication de bâtonnets-dispositif d'alimentation 2 par un simple réservoir de stockage de bâtonnets de glace carbonique, avec des moyens quelconques de chargement de ces bâtonnets dans la trémie 8.Alternatively, for non-permanent installations, it is possible to replace the rod making machine-feeding device 2 assembly with a simple storage tank for sticks of dry ice, with any means of loading these sticks into the hopper. 8.

Claims (6)

1. A dry ice blasting plant of the type comprising an apparatus (1, 2) for producing particles of dry ice, and a metering device (3) to supply a metered flow of these particles into a propelling device (5) with which a carrier gas conduit (4) is provided, characterised in that the said apparatus (1, 2) allows the particles to drop by gravity into the metering device (3) which is separate and spaced from the said apparatus (1, 2) and in that a cover (6) intended to protect the particles from humidity by establishing an atmosphere of anhydrous C02, surrounds the outlet of the said apparatus (1, 2) and the parts of the plant (20, 24) in which the particles would be exposed to the ambient atmosphere in the absence of this cover.
2. A plant according to claim 1, characterised in that the metering device (3) for its part allows the said articles to drop by gravity into the propelling device (5), which is spaced from the metering device (3), the cover (6) surrounding the outlet (9) of the said apparatus (1, 2), the metering device (3) and the propelling device (5).
3. A plant according to one of claims 1 and 2, characterised in that the said apparatus (1, 2) comprises a crusher (1) end means (2) for supplying this crusher with pieces of dry ice.
7. A plant according to any one of claims 1 to 3, characterised in that the metering device (3) comprises a reservoir (11) topped by a hopper (20) arranged beneath the outlet (9) of the said apparatus (1, 2), a hollow extractor screw (13) situated at the bottom end of the reservoir (11) and a stirrer (18) which penetrates into the outlet end of the screw.
5. A plant according to claim 4, characterised in that the hopper (20) is a vibrating hopper and in that a stirring element (16) is situated in the reservoir (11).
6. A plant according to any one of the claims 1 to 5, charactcrised in that the propelling device (5) comprises a funnel (24) opening into the pipe section provided with a carrier gas ejection nozzle (28) terminating beneath the funnel.
EP86901083A 1985-02-04 1986-02-04 Plant for projecting particles of carbon dioxide ice Expired EP0215015B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86901083T ATE42233T1 (en) 1985-02-04 1986-02-04 SYSTEM FOR SPINLING DRY ICE PARTICLES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8501487A FR2576821B1 (en) 1985-02-04 1985-02-04 PLANT FOR SPRAYING CARBONIC ICE PARTICLES
FR8501487 1985-02-04

Publications (2)

Publication Number Publication Date
EP0215015A1 EP0215015A1 (en) 1987-03-25
EP0215015B1 true EP0215015B1 (en) 1989-04-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86901083A Expired EP0215015B1 (en) 1985-02-04 1986-02-04 Plant for projecting particles of carbon dioxide ice

Country Status (8)

Country Link
US (1) US4707951A (en)
EP (1) EP0215015B1 (en)
JP (1) JPH0688211B2 (en)
AU (1) AU578138B2 (en)
CA (1) CA1246877A (en)
DE (1) DE3662850D1 (en)
FR (1) FR2576821B1 (en)
WO (1) WO1986004536A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19544906A1 (en) * 1995-10-30 1997-05-07 Birgit Papcke Method for treating, especially cleaning, surfaces with solid carbon dioxide granules

Families Citing this family (55)

* Cited by examiner, † Cited by third party
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AU578138B2 (en) 1988-10-13
EP0215015A1 (en) 1987-03-25
FR2576821A1 (en) 1986-08-08
AU5395186A (en) 1986-08-26
DE3662850D1 (en) 1989-05-24
WO1986004536A1 (en) 1986-08-14
JPH0688211B2 (en) 1994-11-09
JPS62502036A (en) 1987-08-13
FR2576821B1 (en) 1987-03-27
US4707951A (en) 1987-11-24

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