US3856282A - Device for applying flame-scarfing powder - Google Patents

Device for applying flame-scarfing powder Download PDF

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Publication number
US3856282A
US3856282A US00407273A US40727373A US3856282A US 3856282 A US3856282 A US 3856282A US 00407273 A US00407273 A US 00407273A US 40727373 A US40727373 A US 40727373A US 3856282 A US3856282 A US 3856282A
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US
United States
Prior art keywords
powder
chamber
flame
scarfing
conduit
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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
Application number
US00407273A
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English (en)
Inventor
A Lucht
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Messer Griesheim GmbH
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Messer Griesheim GmbH
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/20—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion
    • B05B7/201—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle
    • B05B7/205—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle the material to be sprayed being originally a particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1481—Spray pistols or apparatus for discharging particulate material
    • B05B7/1486—Spray pistols or apparatus for discharging particulate material for spraying particulate material in dry state

Definitions

  • a device for applying flame-spraying powder to the top and side surfaces of work pieces to be flame scarfed is characterized by a powder supply conduit having at least two branches, one of which terminates at the center of the chamber of the device and the other of which terminates at the frontal side of the chamber.
  • the outlet consists of a plurality of side by side channels connected by means of conduits to the chamber.
  • the invention relates to a device for applying flamespraying powder, particularly iron dust, to the top and side surfaces of the work pieces to be flame scarfed with a conduit for supplying the powder from a storage container into a chamber of the device and with a discharge conduit connected with the chamber, the powder being supplied to the work piece surface through said discharge conduit with the help of a flow medium.
  • Such a device is therefore not suitable for selective flame scarfing where it is important to supply iron dust discontinuously to the individual faulty areas on the surface of the work piece to be processed in order to facilitate the flame scarfing start.
  • the object of the present invention is to provide, emanating from the state of the art, a device for the application of powder, particularly iron dust, by means of which not only the top surface of a work piece to be processed may be provided with iron dust but also by means of which the powder may be applied to the vertical side surfaces of the work piece, and in addition with each interruption of powder supply it is assured that powder does not reach the work piece unintentionally or is not deposited in the outlet.
  • powder particularly iron dust
  • the powder supply conduit has at least a twopart construction of which one branch ends in the center of the chamber and the other branch is connected with the frontal side of the chamber, and that the outlet consists of numerous channels, arranged side by side, which are connected with the chamber by means of conduits.
  • connection pipes it is advantageous furthermore if the branch conduits at their one end have connection pipes firmly connected with the chamber.
  • connection pipes it is furthermore advantageous for the connection pipes to be aligned parallel to each other.
  • each connection pipe and the longitudinal axis of the chamber form an angle of 3075 and preferably 60.
  • the powder supply conduit is provided for the conveying of an additional medium transporting the powder.
  • This supplemental conveying medium current assures a uniform supply of the powder from the chamber and by way of the connecting conduits into the appropriate outlet channel.
  • the quantity of the powder supplied into the outlet channels may also be controlled to a certain extent by a change in pressure of the supplemental conveying'medium current.
  • the supplemental conveying current being first turned off and then the main conveying current, there is formed as mentioned above a loose cone in the connecting conduits which ends at a safe distance from the particular outlet channel.
  • the loose cone With a renewed powder conveyance, the loose cone is then easily dissipated by the additional conveying medium as well as by the main conveying current producing an underpressure or vacuum in the connecting conduits, and the powder reaches, in the form of a powder-conveying-medium mixture, the work piece by way of the outlet channels.
  • the danger of the stopper formation of the powder during an interruption is consequently prevented.
  • a flame-scarfing torch is turnable about an axis proceeding in the direction of flame scarfing
  • the two-part powder supply conduit is arranged between the storage container and the device in such a manner that a constant flow of powder is afforded independent of the tilt position of the flamescarfing torch.
  • the storage container is arranged on the machine essentially vertically or perpendicular above the device.
  • both branch conduits are moved in accordance with the turning movement;
  • the two branch conduits preferably being made like flexible hoses and for the sake of expediency having rigid connecting pieces firmly connected with the device or with the device container; in'this connection, however, independent of the particular turningor swinging of the device, the hoses have an incline which is greated than the angle of repose of the powder to be conveyed, so that a constant flow of powder is afforded.
  • FIG. 1 is a side view of the novel device in cross-section
  • FIG. 2 is a sectional view along line AB in FIG. 1;
  • FIG. 3 is an enlarged illustration of the connection between chamber and outlet channel
  • FIG. 4 is a schematic arrangement of the device with reference to a powder container.
  • FIG. 1 a novel device for the supplying of iron dust (flame-scarfing powder) onto the surface of a work piece, e.g. an iron slab.
  • the device described below as a powder harp, is mounted on the top side of a flame-scarfing torch 14 by means of screws 12, of which only one is shown.
  • Powder harp 10 consists of a main block 16 on which is firmly attached by means of screws 20 a front block 18 pointing in the direction of flame spraying.
  • a cylindrical chamber 22 which extends essentially over the entire length of the block. Longitudinal axis 24 of chamber 22 proceeds horizontally in the normal position of the powder harp.
  • Chamber 22 in accordance with the invention, is in contact with two connecting pipes 26, 28.
  • These connecting pipes are firmly inserted into the main block I6, e.g. by welding or bolting, and with their free ends are connected with flexible hoses or metal hoses 30, 32.
  • These flexible hoses form the branch conduits of a powder supply conduit, designated as a whole with 34.
  • Both supply conduits 30, 32 of the supply conduit 34 end in a distributing piece 36 (FIG. 4) which in turn ends in the bottom of a storage container 38.
  • both connecting pipes 26, 28 are arranged parallel to each other and furthermore shown to be opposite chamber 22.
  • Chamber 22 has numerous connecting conduits 42, arranged side by side, which distributed over the broadside, extend through the main block 16.Each connecting conduit ends in a respective outlet channel 44,.
  • the numerous outlet channels which in the normal position of the powder harp 10 are directed downwards at an incline, end in a chamber 46, which in turn terminates in an outlet slot 48 extending over the entire breadth of the powder harp.
  • chamber 46 and slot 48 it is of course possible and is within the frame of the invention to provide individual outlet bores forming the continuation of each outlet channel 44.
  • each outlet channel 44 is in contact by means of channels 50 and a storage chamber 52 with a conveying medium conduit 54 from which the conveying medium, usually compressed air,is supplied to the outlet channels.
  • the compressed air in accordance with the exemplary embodiment, is introduced into the outlet channel 44 by means of a nozzle 56, so that in the terminal area of each connecting conduit 42 in channel 44, an optimum negative or underpressure or suction is thereby obtained.
  • purifying air is supplied to the powderharp.
  • the purifying air reaches slot 48 in the direct proximity of the outlet end of the slot and serves during a pause in operations to free the powder harp of any still adhering powder residues.
  • said harp For cooling the powder harp, said harp is equipped with a cooling channel system 60, which is shown in FIG. 1 in a simplified manner. Air, water or another coolant may be used as the cooling agent.
  • storage container 38 is connected with a main storage container 64 by means of conduit 62.
  • a pressure e.g. 3-6 atmospheric super pressure
  • container 38 is equipped with a pressure escape valve 66 adjusted so that only a pressure of ca. 1 at. sup. press. is maintained in container 38.
  • the novel device is arranged on the top side of a flame-scarflng torch 14 and serves to supply iron dust to the spot to be flame scarfed at the beginning of the flame-scarfing process in order to shorten thereby the heating up time during which time the spot of the work piece to be flame scarfed is heated to ignition temperature by the preheating flame.
  • the iron dust shortening the preheating time, reaches chamber 22 of the powder harp from the storage container 38 by the force of gravity and supported by the overpressure (ca. 1 atmosphere) prevailing there by means of the two-part conduit 34.
  • the powder is drawn into conduits 42, subject to the underpressure prevailing in the connecting conduits 42, this underpressure being caused by the conveying medium (compressed air) flowing through the outlet channels 44.
  • the powder From conduits 42, the powder then reaches the outlet channels and is there taken along by the compressed air to the outlet slot 48 in the form of a powder-air mixture.
  • This suction effect of the compressed air on the powder in the connecting conduits 42 is supported by the superpressure present in container 38 and continuing into chamber 22, the iron dust being pushed into the connecting conduits 42 by this superpressure.
  • the compressed air (conduit 54) in a given instance and also the air of the storage system 38, 62, 64, acting as the supplemental conveying medium, are all turned off. Because of the presence of the connecting conduit 42 between chamber 22 and the particular outlet channel 44, it is advantageously prevented that upon turning off, the powder does not travel from chamber 22 into the outlet channels 44-and from there on the work piece.
  • the connecting conduits 42 only a loose cone 66 is built up whose tip 68 is disposed by a certain distance S (which may be considered a safety zone) from the termination of the connecting. conduit into the "channel 44.
  • This safety zone S is sufficient to prevent the powder from falling into the outlet channels during operation, e.g. generated vibrations.
  • the powder harp is not only possible as stated above to provide the (horizontal) surface of a work piece, e.g. an iron slab, with powder for the purpose of shortening the preheating time but the powder harp is also suitable, according to the invention, for the application of powder to the (vertical) side surfaces of the work piece.
  • a work piece e.g. an iron slab
  • the powder harp is also suitable, according to the invention, for the application of powder to the (vertical) side surfaces of the work piece.
  • the powder harp is provided'on the laterally arranged flame-scarfing torch of a flamescarfing machine whose outlet slot proceeds parallel, hence vertical to the side surface to be flame scarfed.
  • a flamescarfing machine whose outlet slot proceeds parallel, hence vertical to the side surface to be flame scarfed.
  • Such a machine is disclosed in U.S. Pat. No. 2,295,523, for example.
  • Such a turnable flame scarfing torch is disclosed in DOS 1,947,284.
  • the powder harp carried by the torch is equally turned as indicated in FIG. 4 by dotted lines. According to FIG. 2, the rotation of the powder harp takes place at a point of rotation M in a counterclockwise manner.
  • flexible hoses 30, 32 it is made certain that the powder may flow into chamber 22 from storage container 38 in any position of the powder harp, since the hoses always have such an incline (pitch) which is greater than the angle of repose of the powder (FIG. 4).
  • the connecting pipe 26, terminating in the frontal side of chamber 22 is now provided above the connecting pipe 28, terminating in about the center in chamber 22.
  • the powder now flowing from the bottom" connecting pipe 28 fills the bottom left half of the chamber in FIG. 2, while the upper" connecting pipe 26 supplies the upper right half of the chamber with powder.
  • the entire chamber is sufficiently supplied with powder from the storage container, so that powder flows into the outlet channels 44 from all connecting conduits 42 and is conveyed onto the work piece from the entire outlet slot 48 (or' bores) extending over the breadth of the powder harp.
  • the novel powder harp is thus usable both for top surface as well as side surface flame scarfing and particularly also for selective flame scarflng, wherein it is necessary to carry out numerous flame-scarfing processes often in quick succession in order to eliminate individual faults on the work piece surfaces.
  • FIG. 2 it is only possible to supply with powder aside from the top surface, only the left side surface of the work piece, seen in the direction of flame scarfing.
  • the connecting pipe 26 is now provided on the left, in FIG. 2, frontal side of chamber 22.
  • a third connecting pipe 26 a at the other frontal side and in particular more suitably in a mirror-like manner to connecting pipe 26.
  • both side surfaces of the work piece facing each other may be supplied with powder by a single powder harp.
  • a device for applying flame-scarfing powder to the surfaces of work pieces to be flame-scarfed with a conduit for supplying the powder from a storage container into a chamber in the device and with an outlet conduit connected with the chamber through which the powder may be supplied with the aid of a conveying medium to the work piece surface
  • said powder supply conduit having at least two branches, one of said branches terminating in about the center of said chamber, the other of said branches being connected to the frontal side of said chamber, said outlet conduit being in the form of a plurality of side by side outlet channels, and each of said channels communicating with said chamber.
  • each of said conduit branches terminates in a rigid pipe rigidly connected with said chamber.
  • said powder supply conduit includes means for conveying a supplemental medium for transporting the powder.
  • said powder supply conduit includes means for conveying a supplemental medium for transporting the powder.
  • a flame-scarfing torch said device beingmounted on said 'flame-scarfing torch, said flame-spraying torch being rotatable about an axis directed in the flamespraying direction for flame-s'carfing the top and side surfaces of the work piece, a storage container for the powder, said mounting means connecting said powder supply conduit for communication between said storage container and said device to provide a constant powder flow regardless of the tilt position of the flamescarfing torch.
  • said supply conduit includes a further branch connected to the side of said chamber remote from other of said branches and disposed as a mirror image thereof.
  • each of saidbranches includes a flexible hose connected to its rigid pipe to permit said device to be moved to different positions.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Gas Burners (AREA)
  • Nozzles (AREA)
  • Coating Apparatus (AREA)
US00407273A 1972-10-21 1973-10-17 Device for applying flame-scarfing powder Expired - Lifetime US3856282A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2251788A DE2251788C3 (de) 1972-10-21 1972-10-21 Vorrichtung zum Aufbringen von Flämmpulver

Publications (1)

Publication Number Publication Date
US3856282A true US3856282A (en) 1974-12-24

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US00407273A Expired - Lifetime US3856282A (en) 1972-10-21 1973-10-17 Device for applying flame-scarfing powder

Country Status (8)

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US (1) US3856282A (sv)
JP (1) JPS5315697B2 (sv)
AT (1) AT328826B (sv)
DE (1) DE2251788C3 (sv)
FR (1) FR2204131A5 (sv)
GB (1) GB1433187A (sv)
IT (1) IT994465B (sv)
SE (1) SE382932B (sv)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2482490A1 (fr) * 1980-05-16 1981-11-20 Messer Griesheim Gmbh Chalumeau de flammage
FR2482491A1 (fr) * 1980-05-16 1981-11-20 Messer Griesheim Gmbh Dispositif pour le flammage de la surface d'une piece metallique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56501556A (sv) * 1979-11-15 1981-10-29
JPS582341Y2 (ja) * 1980-11-18 1983-01-17 昌 山内 コンド−ム

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654329A (en) * 1946-07-02 1953-10-06 Union Carbide & Carbon Corp Blowpipe employing adjuvant powder for thermochemically removing material
US2873224A (en) * 1955-05-06 1959-02-10 Union Carbide Corp Process and apparatus for desurfacing a refractory metal body
US3224748A (en) * 1961-04-12 1965-12-21 Knapsack Grieshcim Ag Regulating device for powder nozzles
US3230117A (en) * 1960-08-12 1966-01-18 Messer Griesheim Gmbh Process and apparatus for flame scarfing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654329A (en) * 1946-07-02 1953-10-06 Union Carbide & Carbon Corp Blowpipe employing adjuvant powder for thermochemically removing material
US2873224A (en) * 1955-05-06 1959-02-10 Union Carbide Corp Process and apparatus for desurfacing a refractory metal body
US3230117A (en) * 1960-08-12 1966-01-18 Messer Griesheim Gmbh Process and apparatus for flame scarfing
US3224748A (en) * 1961-04-12 1965-12-21 Knapsack Grieshcim Ag Regulating device for powder nozzles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2482490A1 (fr) * 1980-05-16 1981-11-20 Messer Griesheim Gmbh Chalumeau de flammage
FR2482491A1 (fr) * 1980-05-16 1981-11-20 Messer Griesheim Gmbh Dispositif pour le flammage de la surface d'une piece metallique
US4322059A (en) * 1980-05-16 1982-03-30 Messer Griesheim Gmbh Scarfing torch
US4324389A (en) * 1980-05-16 1982-04-13 Messer Griesheim Gmbh Device for scarfing the surface of a metal workpiece

Also Published As

Publication number Publication date
GB1433187A (en) 1976-04-22
DE2251788C3 (de) 1975-04-30
DE2251788B2 (de) 1974-08-15
JPS4974148A (sv) 1974-07-17
IT994465B (it) 1975-10-20
FR2204131A5 (sv) 1974-05-17
ATA812573A (de) 1975-06-15
AT328826B (de) 1976-04-12
SE382932B (sv) 1976-02-23
JPS5315697B2 (sv) 1978-05-26
DE2251788A1 (de) 1974-05-02

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