US3806309A - Temperature measurement - Google Patents

Temperature measurement Download PDF

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Publication number
US3806309A
US3806309A US00314392A US31439272A US3806309A US 3806309 A US3806309 A US 3806309A US 00314392 A US00314392 A US 00314392A US 31439272 A US31439272 A US 31439272A US 3806309 A US3806309 A US 3806309A
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US
United States
Prior art keywords
furnace
housing
radiation
level
thermal insulation
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 - Lifetime
Application number
US00314392A
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English (en)
Inventor
W Laws
Chesney H Mc
F Salter
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.)
British Iron and Steel Research Association BISRA
Pentax Corp
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British Iron and Steel Research Association BISRA
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 British Iron and Steel Research Association BISRA filed Critical British Iron and Steel Research Association BISRA
Application granted granted Critical
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Assigned to ASAHI KOGAKU KOGYO KABUSHIKI KAISHA reassignment ASAHI KOGAKU KOGYO KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ROLLEI OF AMERICA INC 100 LEHIGH DR RAIRFIELD NJ A NJ CORP
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces

Definitions

  • No.2 314,392 A reheating furnace for slabs or billets is provided with at least one temperature measuring device having an upwardly directed radiation receiving surface pro- [30] Forms" Application grionty D vided by a plate located at the upper end of a cyclin- Dec. 22, 1971 Great Britam 59655/71 drical housing Substantial thermal insulation is vided around the housing and in use the radiation re- [52] US. CL", 432/50,:36/15 B, 432/126 caving surface f plate i disposed closely adja; [5]] Int. Cl.
  • a furnace for heating metal slabs including means for i supporting metal slabs during their movement through the furnace, a plurality of heat sources located within the furnace and at least one temperature measuring device having an upwardly directed radiation receiving surface disposed at a level below the level of the top of the supporting means; said device being so constructed and arranged that in use the radiationreceiving surface is disposed closely adjacent and facing the underside of a slab. being heated, said surface being substantially shielded from ambient radiation within the furnace whereby radiation is received on said surface substantially solely from the under surface of the slab.
  • the measuring device according to the invention can be spaced a small distance from the slab so that background radiation is eliminated.
  • the spacing can for example be between 1 and 3 centimetres.
  • the furnace can be on any type of furnace but is preferably a pusher furnace in which the supporting means consists of skids extending along the length of the furnace supported on cross members.
  • the temperature measuring device can be mounted on a supporting system independent of the skid support system or can be mounted on a cross member that also supports the skids.
  • the device can be rigidly mounted but it is also possible to have the radiation receiving surface movable so that it can be deflected by bent slabs. For example the device can be pivoted and spring urged.
  • the furnace can be of a type in which all the burners are directed in the same sense or of a type in which the burners in the preheat zone areopposed to the burners in the soak zone.
  • the temperature measuring device preferably includes a housing, a plate forming said radiation receiving surface thermally insulated from the housing, and a thermocouple connected to the plate, the leads for the thermocouple passing through said housing.
  • the housing is surrounded by insulating material presenting a generally flat surface generally level with the radiation receiving surface.
  • the leads can pass through the furnace in close proximity with the cross member which may be suitably cooled.
  • FIG. 1 shows a longitudinal cross section through one example of a slab reheating furnace with temperature measuring devices in accordance with the invention
  • FIG. 2 is a section on the line II II of FIG. I and FIG. 3 is a cross section through the temperature measuring devices shown in FIGS. 1 and 2. r
  • A' slab reheating pusher furnace 2 has two heating zones 4 and 6 with a waste gas offtake 8 between them.
  • the zone 4 is longer than the zone 6 and each zone is heated by burners 10 in the end walls of the zones so that the flames of the burners 10 in zone 4 are opposed to the flames of the burnersl0 in zone 6.
  • Water cooled skids 12 extend along the length of the furnace 2 for supporting slabs 14 to be heated.
  • the burners 10 are disposed above and below the skids 12 so that the slabs are heated from below as well as above.
  • the skids 12 are supported on cross members 16 consisting of water cooled pipes which in turn are supported on water cooled upright members 18.
  • Slabs 14 to be heated are introduced through an entrance 20 and are pushed through the furnace 2 by successively introduced slabs until the slabs are discharged through discharge chute 22.
  • the skids 12 consist of water cooled pipe 24 supported on which is a rail 27 on which the slabs 14 bear.
  • a number of temperature measuring devices 26 are spaced along the length of the furnace 2 mounted on cross members 16.
  • Each device 26 includes a cylindrical housing 28 connected to the cross member 16 by a sleeve 30 to which it is welded after the desired height of the device has been determined.
  • the housing 28 is surrounded with thermal insulation 32.
  • a thermocouple 40 passesinto the plate 34.
  • the plate 34 is held in position by a cylindrical member 48.
  • a lead for the thermocouple passes through a plug 46 in the member 48 at the bottom end of the housing 28 and passes along the cross member 16.
  • the lead 50 is strapped to the cross member 16 and is covered with thermal insulation 52.
  • the inside of the member 48 is filled with insulating material.
  • the upper surface 36 of plate 34 is arranged to be spaced between 1 to 3 centimetres below the level of the top of the rails 27 that support the slabs l4 and hence the same distance below the bottom of the slabs 14.
  • the upper surface. 42 of the insulation material 32 is level with the surface 36 and offers sufficient blockage such that practically no radiation reaches the surface 36 except radiation from the slabs 14.
  • the thermocouple 40 will therefore register a reading which is remeasuring device 26, the slabs 14, are in turn, shielded from the furnace heat. This is generally undesirable,
  • a metal slab reheating furnace comprising: means for supporting metal slabs during their movement through the furnace; heat sources within the furnace and at least one temperature measuring device comprising a housing having an open upper end; a plate providing an upwardly directed radiation receiving surface disposed in the open upper end of said housing at a level below the level of the top of said supporting tion is received on said surface substantially solely from the under surface of the slab.
  • thermo insulation means surround the exterior side wall surface of said housing.
  • thermo insulation means is disposed level with said radiation receiving surface of said plate.
  • a furnace as claimed in claim 3 wherein said housing comprises a hollow cylindrical member packed with thermally insulating material.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Radiation Pyrometers (AREA)
  • Tunnel Furnaces (AREA)
US00314392A 1971-12-22 1972-12-12 Temperature measurement Expired - Lifetime US3806309A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5965571A GB1409251A (en) 1971-12-22 1971-12-22 Temperature measurement in reheating furnaces

Publications (1)

Publication Number Publication Date
US3806309A true US3806309A (en) 1974-04-23

Family

ID=10484165

Family Applications (1)

Application Number Title Priority Date Filing Date
US00314392A Expired - Lifetime US3806309A (en) 1971-12-22 1972-12-12 Temperature measurement

Country Status (10)

Country Link
US (1) US3806309A (de)
JP (1) JPS4871307A (de)
AU (1) AU463250B2 (de)
BE (1) BE793161A (de)
CA (1) CA957527A (de)
DE (1) DE2261197A1 (de)
FR (1) FR2164782B1 (de)
GB (1) GB1409251A (de)
IT (1) IT976143B (de)
NL (1) NL7217511A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4070148A (en) * 1976-06-14 1978-01-24 International Business Machines Corporation Apparatus for monitoring product temperature in an open ended, secondary emission, product carrying conveyor furnace
US4081291A (en) * 1973-12-21 1978-03-28 British Steel Corporation Temperature measurement sensor
US4741695A (en) * 1985-08-09 1988-05-03 Chugai Ro Co., Ltd. Walking beam type reheating furnace
US4884967A (en) * 1988-09-26 1989-12-05 Combustion Concepts, Inc. Steel reheating furnace
US20120024284A1 (en) * 2009-02-23 2012-02-02 Extrutec Gmbh Device for preheating objects, particularly aluminum strands, rods, or pins, as well as a system having such a device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2047958B (en) * 1979-04-04 1983-05-25 Atomic Energy Authority Uk Temperature sensors
DE102010061834A1 (de) 2010-08-12 2012-02-16 Sms Siemag Ag Ofen, insbesondere Tunnelofen, einer metallurgischen Anlage und Verfahren zur Messung von Temperaturen und Stoffkonzentrationen in der Ofenluft in dem Ofen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1944449A (en) * 1931-04-01 1934-01-23 Caterpillar Tractor Co Metallurgical apparatus
US3447745A (en) * 1966-07-25 1969-06-03 Electric Furnace Co Furnace heating control
US3539100A (en) * 1968-08-02 1970-11-10 Granco Equipment Temperature sensing of billets
US3637198A (en) * 1970-01-12 1972-01-25 Koppers Wistra Ofenbau Gmbh Furnace for heat treating of metallic workpieces

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1944449A (en) * 1931-04-01 1934-01-23 Caterpillar Tractor Co Metallurgical apparatus
US3447745A (en) * 1966-07-25 1969-06-03 Electric Furnace Co Furnace heating control
US3539100A (en) * 1968-08-02 1970-11-10 Granco Equipment Temperature sensing of billets
US3637198A (en) * 1970-01-12 1972-01-25 Koppers Wistra Ofenbau Gmbh Furnace for heat treating of metallic workpieces

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081291A (en) * 1973-12-21 1978-03-28 British Steel Corporation Temperature measurement sensor
US4070148A (en) * 1976-06-14 1978-01-24 International Business Machines Corporation Apparatus for monitoring product temperature in an open ended, secondary emission, product carrying conveyor furnace
US4741695A (en) * 1985-08-09 1988-05-03 Chugai Ro Co., Ltd. Walking beam type reheating furnace
US4820150A (en) * 1985-08-09 1989-04-11 Chugai Ro Co., Ltd. Walking beam type reheating furnace
US4884967A (en) * 1988-09-26 1989-12-05 Combustion Concepts, Inc. Steel reheating furnace
US20120024284A1 (en) * 2009-02-23 2012-02-02 Extrutec Gmbh Device for preheating objects, particularly aluminum strands, rods, or pins, as well as a system having such a device

Also Published As

Publication number Publication date
IT976143B (it) 1974-08-20
FR2164782A1 (de) 1973-08-03
NL7217511A (de) 1973-06-26
BE793161A (fr) 1973-04-16
DE2261197A1 (de) 1973-07-05
AU463250B2 (en) 1975-06-30
JPS4871307A (de) 1973-09-27
CA957527A (en) 1974-11-12
GB1409251A (en) 1975-10-08
FR2164782B1 (de) 1977-02-04
AU5007272A (en) 1974-06-20

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AS Assignment

Owner name: ASAHI KOGAKU KOGYO KABUSHIKI KAISHA 36-9 MAENO CHO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ROLLEI OF AMERICA INC 100 LEHIGH DR RAIRFIELD NJ A NJ CORP;REEL/FRAME:004206/0898

Effective date: 19820521