US20120223466A1 - Device for heat-treating sheet metal strips - Google Patents

Device for heat-treating sheet metal strips Download PDF

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Publication number
US20120223466A1
US20120223466A1 US13/501,556 US201013501556A US2012223466A1 US 20120223466 A1 US20120223466 A1 US 20120223466A1 US 201013501556 A US201013501556 A US 201013501556A US 2012223466 A1 US2012223466 A1 US 2012223466A1
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US
United States
Prior art keywords
pipe
elbows
middle pipe
bearing pin
radiator
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.)
Abandoned
Application number
US13/501,556
Inventor
Robert Ebner
Eduard Morbitzer
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.)
Ebner Industrieofenbau GmbH
Original Assignee
Ebner Industrieofenbau 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 Ebner Industrieofenbau GmbH filed Critical Ebner Industrieofenbau GmbH
Assigned to EBNER INDUSTRIEOFENBAU GMBH reassignment EBNER INDUSTRIEOFENBAU GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EBNER, ROBERT, MORBITZER, EDUARD
Publication of US20120223466A1 publication Critical patent/US20120223466A1/en
Abandoned legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/126—Radiant burners cooperating with refractory wall surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D91/00—Burners specially adapted for specific applications, not otherwise provided for
    • F23D91/02—Burners specially adapted for specific applications, not otherwise provided for for use in particular heating operations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
    • F23M9/003—Baffles or deflectors for air or combustion products; Flame shields in flue gas ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
    • F23M9/08—Helical or twisted baffles or deflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D99/0035—Heating indirectly through a radiant surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/03009—Elongated tube-shaped combustion chambers

Definitions

  • the invention relates to a device for heat-treating sheet metal strips having at least one radiator pipe unit, which has three pipes located in a common axial plane parallel to the sheet-metal strip, namely one middle pipe connectable to a burner and two outer pipes connected at both ends to the middle pipe via pipe elbows, and having a bearing pin, which is connected to the two pipe elbows between the middle pipe on one side and the two outer pipes on the other side, on the side of the radiator pipe unit opposite to the burner.
  • the sheet-metal strip to be treated which is conveyed parallel to the common axial plane of the pipes of the radiator pipe unit having a feed direction extending transversely to the pipe axes, is heated via the thermal radiation emitted from the pipes of the radiator pipe unit.
  • the mounting of the radiator pipe unit is to be designed so that the thermal expansions of the pipes in the axial direction are taken into consideration.
  • the middle pipe is axially fixed between the burner and outer pipes in a pivot bearing, while at the opposite end of the radiator pipe unit, a typically hollow bearing pin, which is welded onto the two pipe elbows connecting the ends of the middle pipe to the ends of the outer pipes, is supported so it is axially displaceable in a support.
  • the invention is therefore based on the object of implementing a device of the type mentioned at the beginning for heat-treating sheet metal strips in such a manner that the thermal expansions in the area of the pipe elbows connecting the metal pipe to the outer pipes can be taken into consideration when attaching the bearing pin to these pipe elbows.
  • the invention achieves the stated object in that the bearing pin is arranged on a bridge, which bridges a gusset between the two pipe elbows, having two sections extending on both sides of the axis of the middle pipe and inclined at an acute angle to the axis of the middle pipe.
  • the bridge has two sections extending on both sides of the axis of the middle pipe and inclined at an acute angle to the axis of the middle pipe, so that through an angle change of the sections of the bridge inclined to one another at an obtuse angle, because of bending strains occurring in the elastic range, a sufficient length compensation is possible upon a thermal expansion of the pipe elbows.
  • FIG. 1 shows a device according to the invention for heat-treating sheet metal strips in detail in the area of the radiator pipe unit in a simplified side view
  • FIG. 2 shows the radiator pipe unit in detail in the area of the bearing pin in a partially cutaway side view in a larger scale.
  • the device for heat-treating sheet metal strips has at least one radiator pipe unit 1 , which comprises a middle pipe 2 and two parallel outer pipes 3 located in a common axial plane with the middle pipe 2 .
  • the outer pipes 3 each have a flow connection to the middle pipe 2 via terminal pipe elbows 4 .
  • the hot exhaust gases flowing from a burner, which is attached to an extension 5 of the middle pipe 2 , into the middle pipe 2 are therefore partially guided in the circuit via the two outer pipes 3 .
  • a sheet-metal strip 6 which is indicated by dot-dash lines, and which is guided parallel to the common axial plane of the pipes 2 , 3 , in a feed direction 7 which extends transversely to the pipe axes, is heated with the aid of the radiant heat emitted from the pipes 2 , 3 .
  • the radiator pipe unit 1 is mounted on both sides of the pipes 2 and 3 , so that a substantially uniform distribution of the weight load on the two supports results. While the support 8 , which accommodates the extension 5 of the middle pipe 2 and is not shown for reasons of clarity, axially fixes the radiator pipe unit 1 , the opposing support 8 supports the radiator pipe unit 1 so it is axially displaceable. For this purpose, the radiator pipe unit 1 carries, on the end of the middle pipe 2 opposite to the extension 5 , a typically tubular bearing pin 9 , which is supported so it is axially displaceable in a corresponding receptacle of the support 8 .
  • the bridge 10 is formed for this purpose by two sections 12 , which extend at an acute angle to the axis of the middle pipe 2 and enclose an obtuse angle with one another. If the distance of the weld seams between the sections 12 and the pipe elbows 4 changes because of thermal expansions of the pipe elbows 4 , these length changes can be readily compensated for by elastic bending and a change of the angle of the sections 12 connected thereto.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Air Supply (AREA)
  • Tunnel Furnaces (AREA)

Abstract

A device is described for heat-treating sheet metal strips (6) having at least one radiator pipe unit (1), which has three pipes located in a common axial plane parallel to the sheet-metal strip (6), namely one middle pipe (2) attachable to a burner and two outer pipes (3) connected at both ends to the middle pipe (2) via pipe elbows (4), and having a bearing pin (9), connected to the two pipe elbows (4) between the middle pipe (2) on one side and the two outer pipes (3) on the other side, on the side of the radiator pipe unit opposite to the burner. To be able to take the occurring thermal expansions in the area of the pipe elbows (4) into consideration, it is proposed that the bearing pin (9) be arranged on a bridge (10), which bridges a gusset (11) between the two pipe elbows (4), having two sections (12) which extend on both sides of the axis of the middle pipe (2) and are inclined at an acute angle to the axis of the middle pipe (2).

Description

    FIELD OF THE INVENTION
  • The invention relates to a device for heat-treating sheet metal strips having at least one radiator pipe unit, which has three pipes located in a common axial plane parallel to the sheet-metal strip, namely one middle pipe connectable to a burner and two outer pipes connected at both ends to the middle pipe via pipe elbows, and having a bearing pin, which is connected to the two pipe elbows between the middle pipe on one side and the two outer pipes on the other side, on the side of the radiator pipe unit opposite to the burner.
    • DESCRIPTION OF THE PRIOR ART
  • For heat-treating sheet metal strips (DE 20 2008 009 065 U1), providing radiator pipe units which can be heated with the aid of burners is known, which have two outer pipes originating from a middle pipe connected to the burner, located parallel to the middle pipe in a common axial plane, so that with the aid of the outer pipes connected terminally via pipe elbows to the middle pipe, a partial stream of the hot exhaust gases of the burner flowing in the middle pipe can be guided in the circuit in each case. The sheet-metal strip to be treated, which is conveyed parallel to the common axial plane of the pipes of the radiator pipe unit having a feed direction extending transversely to the pipe axes, is heated via the thermal radiation emitted from the pipes of the radiator pipe unit. Because of the high temperatures of the radiator pipes, the mounting of the radiator pipe unit is to be designed so that the thermal expansions of the pipes in the axial direction are taken into consideration. For this purpose, the middle pipe is axially fixed between the burner and outer pipes in a pivot bearing, while at the opposite end of the radiator pipe unit, a typically hollow bearing pin, which is welded onto the two pipe elbows connecting the ends of the middle pipe to the ends of the outer pipes, is supported so it is axially displaceable in a support. However, because thermal expansions occur not only in the direction of the pipe axes, but rather also in the area of the pipe elbows transversely thereto, a significant strain of the weld seams results between the bearing pin and the pipe elbows, which results in the danger of cracking, in particular because the strength of the steels used is reduced because of the high temperature strain.
    • SUMMARY OF THE INVENTION
  • The invention is therefore based on the object of implementing a device of the type mentioned at the beginning for heat-treating sheet metal strips in such a manner that the thermal expansions in the area of the pipe elbows connecting the metal pipe to the outer pipes can be taken into consideration when attaching the bearing pin to these pipe elbows.
  • The invention achieves the stated object in that the bearing pin is arranged on a bridge, which bridges a gusset between the two pipe elbows, having two sections extending on both sides of the axis of the middle pipe and inclined at an acute angle to the axis of the middle pipe.
  • Through the bridge which bridges the gusset area between the two pipe elbows, an advantageous condition is provided for accommodating thermal expansions in the area of the pipe elbows, so that the connection between the bearing pin and the bridge can be kept substantially tension-free. In addition, a direct heat transfer from the pipe elbows to the bearing pin is suppressed by the bridge, whereby the thermal strain of the bearing pin is reduced. In order that thermal expansions in the area of the two pipe elbows can advantageously be accommodated via the bridge, the bridge has two sections extending on both sides of the axis of the middle pipe and inclined at an acute angle to the axis of the middle pipe, so that through an angle change of the sections of the bridge inclined to one another at an obtuse angle, because of bending strains occurring in the elastic range, a sufficient length compensation is possible upon a thermal expansion of the pipe elbows.
  • Particularly simple design conditions result in this context if the bridge is implemented as symmetrical to the axis of the metal pipe, because in this case the coaxial mounting of the radiator unit to the middle pipe can be ensured in a simple manner.
    • BRIEF DESCRIPTION OF THE DRAWING
  • The object of the invention is shown as an example in the drawing. In the figures
  • FIG. 1 shows a device according to the invention for heat-treating sheet metal strips in detail in the area of the radiator pipe unit in a simplified side view and
  • FIG. 2 shows the radiator pipe unit in detail in the area of the bearing pin in a partially cutaway side view in a larger scale.
    •  DESCRIPTION OF THE PREFERRED EMBODIMENT
  • As can be inferred from FIG. 1, the device for heat-treating sheet metal strips has at least one radiator pipe unit 1, which comprises a middle pipe 2 and two parallel outer pipes 3 located in a common axial plane with the middle pipe 2. The outer pipes 3 each have a flow connection to the middle pipe 2 via terminal pipe elbows 4. The hot exhaust gases flowing from a burner, which is attached to an extension 5 of the middle pipe 2, into the middle pipe 2 are therefore partially guided in the circuit via the two outer pipes 3. A sheet-metal strip 6, which is indicated by dot-dash lines, and which is guided parallel to the common axial plane of the pipes 2, 3, in a feed direction 7 which extends transversely to the pipe axes, is heated with the aid of the radiant heat emitted from the pipes 2, 3.
  • The radiator pipe unit 1 is mounted on both sides of the pipes 2 and 3, so that a substantially uniform distribution of the weight load on the two supports results. While the support 8, which accommodates the extension 5 of the middle pipe 2 and is not shown for reasons of clarity, axially fixes the radiator pipe unit 1, the opposing support 8 supports the radiator pipe unit 1 so it is axially displaceable. For this purpose, the radiator pipe unit 1 carries, on the end of the middle pipe 2 opposite to the extension 5, a typically tubular bearing pin 9, which is supported so it is axially displaceable in a corresponding receptacle of the support 8. Because of the high exhaust gas temperatures inside the pipes 2, 3, these pipes are subjected to a corresponding thermal expansion, the axial length compensation thus required being ensured via the bearing pin 9, which is displaceable in the support 8. However, not only the pipes 2, 3, but rather also the pipe elbows 4 are subject to a thermal strain, which causes a thermal expansion of the pipe elbows in the elbow longitudinal direction. In order that these thermal expansions in the area of the pipe elbows 4 can also be taken into consideration, the bearing pin 9 is not fastened directly on the pipe elbow 4, but rather is arranged on a bridge 10, which bridges the gusset area 11 between the two pipe elbows 4. Therefore, thermal expansions of the pipe elbows 4 can be compensated for via this bridge.
  • According to FIG. 2, the bridge 10 is formed for this purpose by two sections 12, which extend at an acute angle to the axis of the middle pipe 2 and enclose an obtuse angle with one another. If the distance of the weld seams between the sections 12 and the pipe elbows 4 changes because of thermal expansions of the pipe elbows 4, these length changes can be readily compensated for by elastic bending and a change of the angle of the sections 12 connected thereto.
  • This means that the weld seams between the sections 12 of the bridge 10 and the bearing pin 9 remain substantially free of tensions as a result of the thermal expansion of the pipe elbows 4, which avoids the danger otherwise occurring to the connection of the bearing pin 9 to the pipe elbows 4. In addition, the direct heat transfer from the pipe elbows 4 to the bearing pin 9 is interrupted via the sections 12 of the bridge 10 and therefore a lesser thermal strain of the bearing pin 9 can be expected.

Claims (2)

1. A device for heat-treating sheet metal strips (6) having at least one radiator pipe unit (1), which has three pipes located in a common axial plane parallel to the sheet-metal strip (6), namely one middle pipe (2) attachable to a burner and two outer pipes (3) connected at both ends to the middle pipe (2) via pipe elbows (4), and having a bearing pin (9), connected to the two pipe elbows (4) between the middle pipe (2) on one side and the two outer pipes (3) on the other side, on the side of the radiator pipe unit opposite to the burner, wherein the bearing pin (9) is arranged on a bridge (10), which bridges a gusset (11) between the two pipe elbows (4), having two sections (12) which extend on both sides of the axis of the middle pipe (2) and are inclined at an acute angle to the axis of the middle pipe (2).
2. The device according to claim 1, wherein the bridge (10) is implemented symmetrically to the axis of the middle pipe (2).
US13/501,556 2009-10-13 2010-08-30 Device for heat-treating sheet metal strips Abandoned US20120223466A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0161009A AT508264B1 (en) 2009-10-13 2009-10-13 DEVICE FOR HEAT TREATMENT OF TAPE BANDS
ATA1610/2009 2009-10-13
PCT/AT2010/000313 WO2011044596A1 (en) 2009-10-13 2010-08-30 Device for heat-treating sheet metal strips

Publications (1)

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US20120223466A1 true US20120223466A1 (en) 2012-09-06

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US13/501,556 Abandoned US20120223466A1 (en) 2009-10-13 2010-08-30 Device for heat-treating sheet metal strips

Country Status (12)

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US (1) US20120223466A1 (en)
EP (1) EP2488790A1 (en)
JP (1) JP5542945B2 (en)
KR (1) KR20120099399A (en)
CN (1) CN102597621A (en)
AT (1) AT508264B1 (en)
CA (1) CA2776760A1 (en)
MX (1) MX2012003805A (en)
RU (1) RU2506496C2 (en)
TW (1) TW201113480A (en)
WO (1) WO2011044596A1 (en)
ZA (1) ZA201202059B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120223466A1 (en) * 2009-10-13 2012-09-06 Ebner Industrieofenbau Gmbh Device for heat-treating sheet metal strips
US20140120821A1 (en) * 2012-10-26 2014-05-01 Hamilton Sundstrand Corporation Elbow for cabin air flow system
US8877120B2 (en) 2009-10-13 2014-11-04 Ebner Industrieofenbau Gmbh Device for heat-treating sheet metal strips

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008009065U1 (en) * 2008-07-04 2008-10-09 WS Wärmeprozesstechnik GmbH Radiant heating arrangement with delay compensation
ES2608158T5 (en) * 2013-01-02 2023-07-19 Massimiliano Bisson Support device for radiant tubes
DE102020100748A1 (en) * 2020-01-14 2021-07-15 Loi Thermprocess Gmbh Device for supporting at least two radiant heating tubes in an oven room and an industrial oven

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Publication number Priority date Publication date Assignee Title
US20120223466A1 (en) * 2009-10-13 2012-09-06 Ebner Industrieofenbau Gmbh Device for heat-treating sheet metal strips

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FR2643447B1 (en) * 1989-02-17 1991-10-04 Stein Heurtey RADIANT TUBE SYSTEM FOR HEATING OVENS
JP2579773Y2 (en) * 1993-02-25 1998-08-27 中外炉工業株式会社 Thermal storage radiant tube system
JP3549981B2 (en) * 1996-05-08 2004-08-04 新日本製鐵株式会社 Furnace support structure of radiant tube with alternating heat storage
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Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
US20120223466A1 (en) * 2009-10-13 2012-09-06 Ebner Industrieofenbau Gmbh Device for heat-treating sheet metal strips

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120223466A1 (en) * 2009-10-13 2012-09-06 Ebner Industrieofenbau Gmbh Device for heat-treating sheet metal strips
US8877120B2 (en) 2009-10-13 2014-11-04 Ebner Industrieofenbau Gmbh Device for heat-treating sheet metal strips
US20140120821A1 (en) * 2012-10-26 2014-05-01 Hamilton Sundstrand Corporation Elbow for cabin air flow system
US9381787B2 (en) * 2012-10-26 2016-07-05 Hamilton Sundstrand Corporation Generally wye shaped elbow for cabin air flow system

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EP2488790A1 (en) 2012-08-22
MX2012003805A (en) 2012-05-08
AT508264B1 (en) 2010-12-15
RU2506496C2 (en) 2014-02-10
JP5542945B2 (en) 2014-07-09
AT508264A4 (en) 2010-12-15
RU2012119519A (en) 2013-11-20
CA2776760A1 (en) 2011-04-21
WO2011044596A1 (en) 2011-04-21
JP2013507598A (en) 2013-03-04
TW201113480A (en) 2011-04-16
KR20120099399A (en) 2012-09-10
CN102597621A (en) 2012-07-18
ZA201202059B (en) 2013-05-29

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