EP3551384A1 - Agencement et procédé de traitement d'une surface - Google Patents

Agencement et procédé de traitement d'une surface

Info

Publication number
EP3551384A1
EP3551384A1 EP17822183.4A EP17822183A EP3551384A1 EP 3551384 A1 EP3551384 A1 EP 3551384A1 EP 17822183 A EP17822183 A EP 17822183A EP 3551384 A1 EP3551384 A1 EP 3551384A1
Authority
EP
European Patent Office
Prior art keywords
particles
arrangement
propellant gas
mixing chamber
multiplicity
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.)
Withdrawn
Application number
EP17822183.4A
Other languages
German (de)
English (en)
Inventor
Cerkez Kaya
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.)
Air Liquide Deutschland GmbH
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide Deutschland GmbH
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 Air Liquide Deutschland GmbH, Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide Deutschland GmbH
Publication of EP3551384A1 publication Critical patent/EP3551384A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04—Nozzles therefor

Definitions

  • the invention relates to an arrangement and a process for treating a surface, in particular with a jet comprising a multiplicity of particles.
  • a surface has to undergo mechanical cleaning. It may for instance be necessary in the production of wires for example to clean the finished product to ensure product quality.
  • a wide variety of chemical and/or mechanical cleaning processes are used. The following come into consideration for example: grinding, brushing, ultrasonic exposure or superheated steam treatment. In particular, it is also known to treat surfaces with a jet of carbon dioxide particles.
  • the object of the present invention is to overcome at least partially the technical problems described in connection with the prior art.
  • an arrangement for the treatment of a surface with which particularly uniform and particularly intensive treatment of the surface is possible is intended to be presented.
  • a corresponding process is also intended to be presented.
  • an arrangement for treating a surface with a jet comprising a multiplicity of particles comprises at least:
  • a mixing chamber for mixing a stream of propellant gas with the multiplicity of particles
  • a particle generator which is designed to generate the multiplicity of particles and introduce them into the mixing chamber in a solid state, the particle generator having at least one screen plate, and it being possible for the multiplicity of particles to be formed in a solid state by pressing a solid starting material through the screen plate,
  • a propellant gas line with a propellant gas nozzle for introducing the propellant gas into the mixing chamber and
  • an outlet from the mixing chamber for the stream of propellant gas is used for example in particular in the production of wire and plastic products, but can also be used in other applications, in particular in principle in the case of carbon dioxide jets.
  • cleaning of the surface of a produced wire or of a produced plastic product can be carried out.
  • Flash or burr may also be removed from the surface of a produced wire or plastic product. Removing flash or burr means that excess material is removed from the surface. The excess material may be formed in particular as flash or burr at those places at which parts of a casting mould have been put together and/or at which an inlet for casting material into the casting mould is provided.
  • the solid starting material from which the particles are formed is preferably a substance that is liquid or gaseous at room temperature.
  • the treatment of a surface can be carried out without residues of the substance remaining on the surface.
  • the substance is preferably carbon dioxide.
  • the stream of propellant gas is provided. This may be performed for example by a compressor.
  • the stream of propellant gas is preferably a stream of compressed air.
  • a gas other than air such as for example nitrogen or carbon dioxide, may also be used.
  • the mixing chamber is a space that is closed off with the exception of the openings described. Said openings are in particular an opening of the propellant gas nozzle, and the outlet.
  • the propellant gas nozzle is preferably situated on a side of the mixing chamber that is opposite the outlet.
  • the particle generator is preferably configured in such a way that the solid starting material can be pressed against the screen plate by way of a conveying screw or by way of a pneumatic or mechanical press.
  • the particle generator preferably has a particle generator chamber with an inlet through which the starting material can be introduced. This can take place already in the solid state or alternatively also in the liquid state. In the latter case, the particle generator chamber is preferably subjected to temperature control or cooled in such a way that the starting material is transformed into the solid state on the path from the inlet to the screen plate.
  • the solid starting material can preferably be transported through the particle generator chamber by means of the conveying screw or by means of the pneumatic or mechanical press.
  • the solid starting material preferably takes a form which allows such transport through the particle generator chamber. This means in particular that the solid starting material does not have to be a solid block.
  • the solid starting material may also be subdivided into a multiplicity of small parts.
  • the solid starting material may also for example take the form of pressed snow.
  • the particle generator chamber is preferably configured in a concentric manner around the propellant gas line.
  • the screen plate is preferably of circular configuration, in particular with a cutout for the propellant gas line or for the propellant gas nozzle.
  • the cutout is preferably arranged in the centre of the screen plate.
  • the cutout is preferably of circular configuration.
  • a round propellant gas line or propellant gas nozzle in the centre of a round screen plate makes it possible to achieve particularly uniform mixing of the stream of propellant gas with the particles.
  • a round jet can be generated. Such a jet is preferred for most applications.
  • the screen plate preferably has a multiplicity of openings.
  • the openings in the screen plate are preferably of circular configuration.
  • the openings allow the solid starting material to be pressed through the screen plate, with the result that the particles can be formed.
  • the particles have a particle diameter which results from an opening diameter of the openings. Consequently, the particle size can be controlled by selecting the opening diameter of the openings.
  • the opening diameters of the openings in the screen plate preferably lie in the range from 0.5 mm to 5 mm [millimetres], in particular in the range from 1 mm to 3 mm.
  • an opening diameter of 0.5 mm to 2 mm [millimetres] is preferably selected.
  • an opening diameter of 1 mm to 5 mm [millimetres] is preferably selected.
  • the arrangement is configured in such a way that the screen plate is easily replaceable.
  • the particle size it is possible for the particle size to be adapted to the requirements of different applications by selecting from different screen plates. In some applications, a uniform particle size may be desired. In other applications, it may be appropriate for example to simultaneously blast particles with different sizes onto the surface to be treated.
  • the opening diameters of all openings may be equal in size or different.
  • the generation of particles by means of the particle generator allows particularly large particles to be provided and mixed with the stream of propellant gas.
  • the particles can thus in particular be larger than those that can be formed for example by atomization of liquid carbon dioxide.
  • Larger particles can have greater kinetic energy, and can therefore have a greater effect in the treatment of the surface. For example, with large particles, heavy soiling of a surface can be removed.
  • the fact that the screen plate makes it possible to generate large particles of a uniform size means that a great and also uniform effect can be achieved with the arrangement described, and so in particular a reproducible cleaning performance can be achieved.
  • the arrangement, and in particular the component parts of the arrangement that can come into contact with the substance, in particular with the solid starting material, and/or with the particles, is/are preferably formed with a material that can withstand the low temperatures to be expected when that happens.
  • the temperature may for example be approximately -80°C.
  • Steel in particular, preferably high-grade steel, is preferred as the material for the arrangement.
  • the stream of propellant gas can be introduced into the mixing chamber through the propellant gas line, and the particles can be introduced into the mixing chamber through the screen plate.
  • the particles are introduced into the mixing chamber in the direction of the stream of propellant gas. This results in the entire mixing chamber being available for mixing the stream of propellant gas with the particles.
  • the stream of propellant gas mixed with the particles can exit the arrangement through the outlet from the mixing chamber for the stream of propellant gas.
  • the outlet is preferably configured with a circular cross section. This can make a round jet possible.
  • the propellant gas nozzle, the mixing chamber and the outlet are configured and arranged in such a way that it is possible to generate a flow in which the particles can be mixed with the stream of propellant gas by swirling.
  • the propellant gas nozzle is configured as a Laval nozzle.
  • a Laval nozzle is especially suited for mixing the stream of propellant gas uniformly with the particles.
  • At least the mixing chamber and the propellant gas nozzle are configured to be rotationally symmetric about an axis of the arrangement.
  • the particle generator furthermore has a conveying screw, which is designed to press the solid starting material through the screen plate.
  • the conveying screw is preferably configured in such a way that the solid starting material can be transported from the inlet into the particle generator chamber to the screen plate. Furthermore, the solid starting material can be pressed through the screen plate by means of the conveying screw.
  • the conveying screw can thus serve two functions. In particular, the conveying screw can allow particles to be generated continuously. Consequently, the arrangement is able to continuously generate a jet for treating the surface.
  • the mixing chamber is configured at least as part of an outer Laval nozzle.
  • the propellant gas nozzle, the mixing chamber and the outlet are configured and arranged in such a way that it is possible to generate a flow in which the particles can be mixed with the stream of propellant gas by swirling.
  • a flow can be generated in particular in the manner of a Laval nozzle.
  • the particles are formable at least partially with solid carbon dioxide.
  • Carbon dioxide has the advantage that, immediately after striking the surface to be treated, it is transformed into the gaseous state without leaving any residue.
  • a process for treating a surface with a jet comprising a multiplicity of particles is presented, an arrangement as described being used.
  • the multiplicity of particles is generated by a solid starting material being pressed through a screen plate.
  • the solid starting material comprises carbon dioxide, in particular carbon dioxide snow.
  • the treating of the surface comprises at least one of the following steps:
  • the specified steps may be carried out alternatively or cumulatively, that is to say that a surface may just be cleaned, just have flash or burr removed or both be cleaned and have flash or burr removed.
  • Figure 1 schematically shows a lateral sectional representation of an arrangement for treating a surface.
  • Figure 1 shows a lateral sectional representation of an arrangement 1 for treating a surface with a jet comprising a multiplicity of particles.
  • the arrangement 1 comprises a mixing chamber 2 for mixing a stream of propellant gas with the multiplicity of particles.
  • the arrangement 1 furthermore comprises a particle generator 8, which is designed to generate the multiplicity of particles and introduce them into the mixing chamber 2 in a solid state.
  • the particle generator 8 has a screen plate 10 and a conveying screw 9.
  • the multiplicity of particles can be formed in a solid state by pressing a solid starting material 12 through the screen plate 10 by means of the conveying screw 9.
  • the particle generator 8 preferably has a particle generator chamber 14 with an inlet 13 through which the starting material or a substance for producing the starting material can be introduced.
  • liquid carbon dioxide for example can be expanded through the inlet 13 into the particle generator chamber 14, with the result that solid carbon dioxide is formed as solid starting material and carbon dioxide gas in the particle generator chamber 14.
  • the arrangement 1 furthermore has a propellant gas line 3 with a propellant gas nozzle 4 configured as a Laval nozzle 5, which serves for introducing the propellant gas into the mixing chamber 2.
  • the arrangement 1 also has an outlet 7 from the mixing chamber 2 for the stream of propellant gas.
  • the mixing chamber 2 is configured as part of an outer Laval nozzle 11.
  • the mixing chamber 2 and the propellant gas nozzle 4 are configured to be rotationally symmetric about an axis 6 of the arrangement 1. Also, the outlet 7 is of round configuration .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Nozzles (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

L'invention concerne un agencement (1) pour traiter une surface avec un jet comprenant une multiplicité de particules, l'agencement (1) comprenant au moins : une chambre de mélange (2) pour mélanger un flux de gaz propulseur avec la multiplicité de particules, un générateur de particules (8), qui est conçu pour générer la multiplicité de particules et les introduire dans la chambre de mélange (2) à l'état solide, le générateur de particules (8) ayant au moins une plaque de tamisage (10), la multiplicité de particules ayant la possibilité d'être formée à l'état solide par pression d'un matériau de départ solide (12) à travers la plaque de tamisage (10), une conduite de gaz propulseur (3) avec une buse de gaz propulseur (4) pour introduire le gaz propulseur dans la chambre de mélange (2) et une sortie (7) à partir de la chambre de mélange (2) pour le flux de gaz propulseur. Avec l'agencement présenté et selon le procédé présenté pour traiter une surface, un traitement particulièrement uniforme et particulièrement intense de la surface peut être obtenu. Dans ce cas, il est possible d'utiliser des particules de dioxyde de carbone particulièrement grandes ayant une énergie cinétique élevée, qui ont une taille de particule particulièrement uniforme et particulièrement bien contrôlable. Cela s'applique notamment au nettoyage et à l'élimination de bavures ou de coulures. L'agencement et le procédé peuvent être utilisés en particulier dans la production de produits en fil ou en plastique.
EP17822183.4A 2016-12-08 2017-12-06 Agencement et procédé de traitement d'une surface Withdrawn EP3551384A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016123812.0A DE102016123812A1 (de) 2016-12-08 2016-12-08 Anordnung und Verfahren zum Behandeln einer Oberfläche
PCT/EP2017/081737 WO2018104405A1 (fr) 2016-12-08 2017-12-06 Agencement et procédé de traitement d'une surface

Publications (1)

Publication Number Publication Date
EP3551384A1 true EP3551384A1 (fr) 2019-10-16

Family

ID=60857028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17822183.4A Withdrawn EP3551384A1 (fr) 2016-12-08 2017-12-06 Agencement et procédé de traitement d'une surface

Country Status (8)

Country Link
US (1) US20210331289A1 (fr)
EP (1) EP3551384A1 (fr)
JP (1) JP2020500729A (fr)
BR (1) BR112019011543A2 (fr)
CA (1) CA3046115A1 (fr)
DE (1) DE102016123812A1 (fr)
MX (1) MX2019006561A (fr)
WO (1) WO2018104405A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5390450A (en) * 1993-11-08 1995-02-21 Ford Motor Company Supersonic exhaust nozzle having reduced noise levels for CO2 cleaning system
DE102005005638B3 (de) * 2005-02-05 2006-02-09 Cryosnow Gmbh Verfahren und Vorrichtung zum Reinigen, Aktivieren oder Vorbehandeln von Werkstücken mittels Kohlendioxidschnee-Strahlen
US8454409B2 (en) * 2009-09-10 2013-06-04 Rave N.P., Inc. CO2 nozzles
DE102009057265A1 (de) * 2009-12-08 2011-06-09 Linde Ag Vorrichtung und Verfahren zum Erzeugen und Applizieren von Trockeneis

Also Published As

Publication number Publication date
JP2020500729A (ja) 2020-01-16
DE102016123812A1 (de) 2018-06-14
CA3046115A1 (fr) 2018-06-14
US20210331289A1 (en) 2021-10-28
WO2018104405A1 (fr) 2018-06-14
BR112019011543A2 (pt) 2019-10-15
MX2019006561A (es) 2019-09-04

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