EP0168580A2 - Procédé et cornue pour l'enlèvement de couches carbonisables adhérantes des surfaces de pièces métalliques - Google Patents

Procédé et cornue pour l'enlèvement de couches carbonisables adhérantes des surfaces de pièces métalliques Download PDF

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Publication number
EP0168580A2
EP0168580A2 EP85105845A EP85105845A EP0168580A2 EP 0168580 A2 EP0168580 A2 EP 0168580A2 EP 85105845 A EP85105845 A EP 85105845A EP 85105845 A EP85105845 A EP 85105845A EP 0168580 A2 EP0168580 A2 EP 0168580A2
Authority
EP
European Patent Office
Prior art keywords
retort
blasting
fluidized bed
metal parts
abrasive
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.)
Granted
Application number
EP85105845A
Other languages
German (de)
English (en)
Other versions
EP0168580A3 (en
EP0168580B1 (fr
Inventor
Horst-Dieter Schlick
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.)
SCHLICK-Roto-Jet Maschinenbau GmbH
Schlick Roto-Jet Maschinenbau GmbH
Original Assignee
SCHLICK-Roto-Jet Maschinenbau GmbH
Schlick Roto-Jet Maschinenbau GmbH
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 SCHLICK-Roto-Jet Maschinenbau GmbH, Schlick Roto-Jet Maschinenbau GmbH filed Critical SCHLICK-Roto-Jet Maschinenbau GmbH
Priority to AT85105845T priority Critical patent/ATE65952T1/de
Publication of EP0168580A2 publication Critical patent/EP0168580A2/fr
Publication of EP0168580A3 publication Critical patent/EP0168580A3/de
Application granted granted Critical
Publication of EP0168580B1 publication Critical patent/EP0168580B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B24C1/083—Deburring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
    • B08B7/0071—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
    • B24C3/04—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other stationary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
    • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
    • B44D3/16—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning
    • B44D3/166—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning by heating, e.g. by burning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/12—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B05D1/22—Processes for applying liquids or other fluent materials performed by dipping using fluidised-bed technique
    • B05D1/24—Applying particulate materials

Definitions

  • the invention relates to a method for removing moldable, adhering coatings from metal part surfaces, the metal parts being swelled or pyrolyzed in the course of the method.
  • the bottom part of the retort is air-permeable so that air can be blown into the sand bed from below via the compressed air network or a blower.
  • the fluidized bed medium is heated to a temperature of 400 to 450 C, the metal parts become warmed up at high speed and the organic paint coats become smeared. Stripping times of approx. 20 to 40 minutes are the norm.
  • this object is achieved in a method for removing swellable, adhering coatings in that the metal parts are brought to smoldering temperature in a substantially closed retort ; and that, without leaving the retort, the adhering, coked coating is blasted with progress or after the end of the charring with the aid of heated blasting media.
  • the above-mentioned principle of the invention makes use of a new technique, namely the use of heated abrasive.
  • the temperature of the blasting medium should preferably be in the range of the smoldering temperature, in any case so high that the temperature required for the smoldering does not drop within the retort.
  • the abrasive itself becomes a heat transfer medium, which transfers its temperature to the retort atmosphere and, when it collides with the coating to be removed, also emits heat directly, which leads to gradual pyrolysis and coking of the coating.
  • the particularly advantageous effect of the invention is that the coking progresses and in each case the coked layer is peeled off from the heated abrasive ("gyros principle").
  • the heating in a fluidized bed which is arranged in the lower region of the retort and into which the metal parts to be cleaned can be lowered using a lifting device. After pulling out of the hot fluidized bed, the blasting treatment can begin immediately.
  • the heat transfer within the retort can be further improved by additional air circulation systems and the like.
  • the bedding medium of the fluidized bed can also be the blasting agent at the same time. Is z. B. sand or a steel grain, as is usually used as an abrasive, so processing and regeneration times can be reduced to a minimum.
  • the grain size and the type of blasting medium depend on the tasks at hand.
  • the blasting agent consists of the metal from which the metal cable harness is also made. The material as a whole can then be removed from time to time and refined electrolytically.
  • a retort for carrying out the method has slots in the blasting area for the passage of the blasting agent jets originating from your spinner.
  • centrifugal wheels are usually used, with which a high impulse can be applied.
  • hand-held compressed air blasting guns are also used.
  • the retort can contain a fluidized bed in the lower part, as is known per se for such retorts. This produces a solid bath in a known manner, in which the metal parts can be immersed. With the help of the correspondingly hot fluidized bed medium (preferably air), the metal parts are warmed up at high speed, while at the same time the lacquer coatings and similar coatings are heated. Controlled combustion of inert gases or excess oxygen can also be used to carry out a controlled combustion of the excess paint, the heat of combustion also being available for heating the retort atmosphere.
  • the retort is preferably equipped with a lifting device which also allows the metal parts or a basket receiving the metal parts to be rotated in the blasting medium jet. It is also possible to carry out continuous continuous operation, in particular for long pipes and the like, if the retort is provided with heat-retaining, opposite continuous gates, as is known for closed blasting cubicles.
  • FIG. 1 schematically shows an essentially closed retort 1 which has a total volume adapted to the intended use, it being possible to introduce materials to be treated continuously or discontinuously through openings known per se.
  • a so-called blasting basket 2 is provided, which is located approximately in the center area of the retort 1, for example carried by a lifting device which is attached to the head of the retort (not shown in FIG. 1).
  • a blasting medium is directed in two overlapping jets 4, 4 'onto the blasting basket 2 by means of two centrifugal jet wheels 3, which are known per se.
  • the blasting medium is fed to the centrifugal blast wheels 3 via a mixture cleaning system with a reservoir 6.
  • the abrasive is heated up in the storage container.
  • heating energy is supplied to the container 6 in accordance with the arrow 11.
  • the heating can take place indirectly via hot combustion gases or by means of radiant heaters or wires arranged directly in the storage container.
  • the retort can, for. B. via infrared radiant heaters or by supplying heated air (indicated by arrow 9) heating energy. It is essential that the soiled or coated metal parts are in a substantially closed retort and can be brought to a smoldering temperature which is in the range of 450 ° C for paint residues. By the temperature in the Retort, the adhering paint residue coatings are coked and carbonized from the outside, the carbonization gases being removed by an appropriate extraction (arrow 10) and burned in a thermal post-combustion 7 together with other carbonization gases. The resulting heating energy is returned to the process in accordance with arrows 9 and 11. Additional heating circuits are of course possible, as already indicated.
  • the blasting agent jets decrease layer by layer of the coating that has become brittle.
  • the used abrasive falls into the funnel-shaped receiving area 12 of the retort 1 and is removed there while still hot with the aid of a screw conveyor 14 and conveyed into the container 6 for cleaning with the aid of a bucket elevator 5.
  • the non-burned coating particles deposited for example with the aid of centrifugal separators, can be burned in a furnace 7 for thermal afterburning with the supply of oxygen. The energy gained can be returned to the cycle.
  • the air can be let into the atmosphere inertized via a filter device 8 and, if necessary, after-cooling.
  • FIG. 2 shows an enlargement of the principle of the invention according to FIG. 1 and shows an enlarged retort 21 which, in addition to an upper part, which is designed similarly to the jet station according to FIG.
  • Air which is heated according to arrow 24 or a gaseous medium which is inert to air in terms of its oxygen content is blown in via a perforated retort base 23, with which air is introduced in a manner known per se fluidized fluidized bed 22 is caused.
  • the fluidized bed has its limit at 25. It consists of abrasive that has a temperature that corresponds to the smoldering temperature for the present need.
  • the blasting agent used for blasting is used as the bedding agent for the fluidized bed, for example granular sand or aluminum shot with a grain size between 0.1-1 mm. Steel grain or copper grain can also be used.
  • the material to be blasted for example cable remnants with sheathing, is suspended in a blasting basket or suspended individually from the blasting medium jet 4 or 4 ', which is caused by two centrifugal wheels 3, 3'.
  • the abrasive grit falls into the fluidized bed and is cleaned by coking and blowing through the air. There is a deduction at 10.
  • a lifting device with which the material to be blasted, for example a blasting basket, can be lowered into the fluidized bed 22.
  • This is in a fluidized state and easily picks up the items to be cleaned.
  • the adhering coating has warmed up enough to cause charring.
  • the material is then pulled out of the fluidized bed and brought into the blasting area. There, the adhering, coked residues are immediately removed by the hot blasting agent jet.
  • the soiled and possibly overflowing and volume-increasing blasting medium plus soiling is carried out via a channel 26 and in turn is carried into a mixture cleaning and storage container 6 with the aid of a bucket elevator 15. Similar to the treatment according to FIG. 1, post-combustion, filtering and additional heating take place here, with the abrasive subsequently being recirculated the centrifugal wheels 3, 3 'is supplied.
  • FIG. 3 A more detailed view of the retort for carrying out the method can be seen in FIG. 3.
  • the retort 1 has a box-shaped housing which is provided with a heat insulation layer.
  • a lifting device 28 is provided, on which a blasting basket 2 or another metal part, which may be loosely transportable, can be suspended.
  • the objects can be supplied and removed via opposite gates 29, 29 'provided with heat locks.
  • In the upper area of the retort 1 there are two corresponding slots 17 through which the blasting agent jets 4, 4 ', which originate from the two centrifugal wheels 3, 3', can reach the interior of the blasting chamber.
  • the blasting media is fed to the centrifugal wheels 3, 3 'in an already heated state from the storage chamber 6 via downpipes.
  • the contaminated abrasive falls into the bottom area of retort 1 and is picked up there and then again by a heat-resistant bucket elevator transported upwards into the storage chamber 6.
  • the bottom is inclined in a funnel shape in the direction of the receiving area of the bucket elevator.
  • an inlet for hot air can be seen, with which the atmosphere of the retort 1 can be heated.
  • Two exhaust pipes for the hot, possibly post-combustion exhaust air are shown at 10 '. ,
  • FIG. 4 shows in more detail an embodiment for a retort 21, in which a fluidized fluidized bed 22 is generated in the foot of the retort with the aid of blown-in air 24.
  • the blown-in air which can also be a largely oxygen-free inertized medium, has a temperature which heats the bedding medium, which is also a blasting medium, to a smoldering temperature, as required.
  • the carbonization gases are pulled out of the fluidizable bed and removed via exhaust pipes 10 'or fed to an afterburning.
  • a blasting station which in the present case is also equipped with two centrifugal blast wheels 3, 3 ', a technique similar to that used in FIG falls on top of the fluidized fluidized bed layer 22 by blasting, and is fed back to the chamber 6 for cleaning and heating via a heat-resistant bucket elevator 15.
  • the device according to FIG. 4 it is possible to first fluidize the objects which are located in a blasting basket or are individually suspended Preheat the fluidized bed while coking the coating. After pulling out with the aid of the lifting device 28, the irradiation process with the blasting medium heated to the smoldering temperature then begins, the already coked layers being removed after a short time.
  • one part of the material to be blasted can be kept in the fluidized bed for warming up, while another part is blasted in the blasting area.
  • auxiliary units used in the present exemplary embodiments such as supply air and extract air fans as well as for cleaning and filtering and the bucket elevator, are only to be understood as technical design possibilities, without being a limitation of the problem solutions.
  • the pyrolysis coke removed by the blasting agent is very fine-grained to powdery, it can easily be separated from the blasting agent again in conventional separating cascades and then subjected to post-combustion.
  • the pyrolysis gas can also be burned in known afterburners and furnaces.
  • Paint hangers each 0.4 m long and with old paint Layers up to 5 mm thick are loosely layered in a blasting basket and suspended in the blasting area of a retort according to FIG. 1.
  • the capacity of the retort is 3 m (1 m base with 3 m height).
  • the lower half of the retort is filled with a fluid bed.
  • Steel grain with a grain size of 0.2 - 0.4 mm grain thickness is used for the jet and fluid bed.
  • the blasting medium is heated to 450 ° C by blowing in air and at this temperature is also conveyed from the bucket elevator into chamber 6 and reheated again.
  • the parts are first heated in the fluidized bed for ten minutes, then lifted out of fluidized bed 0 and hot-blasted at 450 C for five minutes while rotating the blasting basket.
  • the pyrolysis and smoldering gases are removed.
  • the parts can be removed without residue.
  • Cable sections in a length of 5 - 50 cm with a metal strand thickness between 8 and 20 mm are loosely layered in a blasting basket and with a grit of 0.2 to 0.5 mm grit at 500 C (copper shot with o copper cables) or 380 C (aluminum shot on aluminum cables) is blasted in a heatable retort, the internal temperature of which is kept at 500 C or 400 C, respectively. Fluid fluid bed stratification is not provided.
  • the treatment takes between 5 and 30 minutes. This time can be determined empirically or optically. Completely stripped metal strands can be removed from the blasting basket.
  • the process can be used in both batch and continuous processes, for example for the removal of anti-drumming compounds from steel pipes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Processing Of Solid Wastes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
EP85105845A 1984-07-17 1985-05-13 Procédé et cornue pour l'enlèvement de couches carbonisables adhérantes des surfaces de pièces métalliques Expired - Lifetime EP0168580B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85105845T ATE65952T1 (de) 1984-07-17 1985-05-13 Verfahren und retorte zur entfernung verschwelbarer, anhaftender beschichtungen von metallteil-oberflaechen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3426242 1984-07-17
DE3426242A DE3426242C1 (de) 1984-07-17 1984-07-17 Verfahren und Retorte zur Entfernung verschwelbarer,anhaftender Beschichtungen von Metallteil-Oberflaechen

Publications (3)

Publication Number Publication Date
EP0168580A2 true EP0168580A2 (fr) 1986-01-22
EP0168580A3 EP0168580A3 (en) 1988-08-10
EP0168580B1 EP0168580B1 (fr) 1991-08-07

Family

ID=6240805

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85105845A Expired - Lifetime EP0168580B1 (fr) 1984-07-17 1985-05-13 Procédé et cornue pour l'enlèvement de couches carbonisables adhérantes des surfaces de pièces métalliques

Country Status (5)

Country Link
US (1) US4693756A (fr)
EP (1) EP0168580B1 (fr)
JP (1) JPS6135882A (fr)
AT (1) ATE65952T1 (fr)
DE (2) DE3426242C1 (fr)

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US5207234A (en) * 1988-01-11 1993-05-04 L.I.C.A. Di Rosso & C.S. N.C. Method for making micro-abrasions on human tissue
DE3805435C2 (de) * 1988-02-22 1993-11-25 Atzger Juergen Verfahren und Vorrichtung zur thermischen Reinigung von beschichteten Werkstücken
US5044129A (en) * 1990-07-05 1991-09-03 The United States Of America As Represented By The Secretary Of The Air Force Cryogenic mechanical means of paint removal
DE4136990C2 (de) * 1991-11-11 2002-12-05 Ald Vacuum Techn Ag Verfahren zur Entfettung und Reinigung von mit fett- und/oder ölhaltigen Stoffen behaftetem Gut
DE4137152C1 (en) * 1991-11-12 1993-02-18 Juergen Dr.-Ing. 7012 Fellbach De Atzger Device for cleaning metal articles with organic substance e.g. paint - has fluidised bed reactor filled with fluidising medium e.g. heated sand
US5571335A (en) * 1991-12-12 1996-11-05 Cold Jet, Inc. Method for removal of surface coatings
US5782253A (en) * 1991-12-24 1998-07-21 Mcdonnell Douglas Corporation System for removing a coating from a substrate
US5328517A (en) * 1991-12-24 1994-07-12 Mcdonnell Douglas Corporation Method and system for removing a coating from a substrate using radiant energy and a particle stream
US5613509A (en) * 1991-12-24 1997-03-25 Maxwell Laboratories, Inc. Method and apparatus for removing contaminants and coatings from a substrate using pulsed radiant energy and liquid carbon dioxide
US5233791A (en) * 1992-03-02 1993-08-10 Mcqueen Jr Joe C Apparatus for grinding the internal surface of pipe
KR960703686A (ko) * 1993-07-16 1996-08-31 테리 알란 메쑤 금속 및 합금물질로부터 페인트, 라커 및 기타 코팅물질을 제거하는 방법
NL9400438A (nl) * 1994-03-18 1995-11-01 Deville Corp Nv Werkwijze en inrichting voor het reinigen van machinedelen.
DE19813864C1 (de) 1998-03-27 1999-09-30 Schwing Fluid Technik Ag Verfahren zur Entfernung von Polymerablagerungen auf Maschinenteilen, Apparaten und Werkzeugen aus Metall oder Keramik
JP4548105B2 (ja) * 2004-12-08 2010-09-22 東洋製罐株式会社 樹脂被覆金属成形体からの樹脂被覆除去方法及び該方法により得られるチタン成形体
DE102012020418B4 (de) * 2012-10-12 2014-09-04 Audi Ag Verfahren zum Behandeln eines Gusswerkstücks, Vorrichtung zur Durchführung eines derartigen Verfahrens und nach einem derartigen Verfahren behandeltes Gusswerkstück
CN112916518A (zh) * 2021-01-20 2021-06-08 曲靖晶龙电子材料有限公司 一种石英坩埚清理辅助装置
CN114060834B (zh) * 2021-10-11 2023-12-26 佛山市三水凤铝铝业有限公司 一种喷涂挂具清理装置及其清理方法

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Also Published As

Publication number Publication date
ATE65952T1 (de) 1991-08-15
US4693756A (en) 1987-09-15
DE3426242C1 (de) 1985-11-07
EP0168580A3 (en) 1988-08-10
JPS6135882A (ja) 1986-02-20
EP0168580B1 (fr) 1991-08-07
DE3583710D1 (de) 1991-09-12

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