EP0033845A1 - Process and apparatus for changing transport rollers in a roller-hearth furnace - Google Patents

Process and apparatus for changing transport rollers in a roller-hearth furnace Download PDF

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Publication number
EP0033845A1
EP0033845A1 EP81100181A EP81100181A EP0033845A1 EP 0033845 A1 EP0033845 A1 EP 0033845A1 EP 81100181 A EP81100181 A EP 81100181A EP 81100181 A EP81100181 A EP 81100181A EP 0033845 A1 EP0033845 A1 EP 0033845A1
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EP
European Patent Office
Prior art keywords
roller
replaced
furnace
contact
support roller
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
EP81100181A
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German (de)
French (fr)
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EP0033845B1 (en
Inventor
Horst Ing.-Grad. Nickel
Karl Ing.-Grad. Lefor
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.)
Sundwiger Eisenhuette Maschinenfabrik Grah & Co
Sundwiger Eisenhutte Maschinenfabrik Grah and Co
Original Assignee
Sundwiger Eisenhuette Maschinenfabrik Grah & Co
Sundwiger Eisenhutte Maschinenfabrik Grah and Co
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Application filed by Sundwiger Eisenhuette Maschinenfabrik Grah & Co, Sundwiger Eisenhutte Maschinenfabrik Grah and Co filed Critical Sundwiger Eisenhuette Maschinenfabrik Grah & Co
Publication of EP0033845A1 publication Critical patent/EP0033845A1/en
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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
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/562—Details
    • C21D9/563—Rolls; Drums; Roll arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types

Definitions

  • the invention relates to a method and a device for replacing idlers in roller hearth continuous annealing furnaces during ongoing furnace operation.
  • the annealed material is passed through the furnace via rotatably driven idler rollers, which are supported on both sides in bearings on the side walls of the furnace, and annealed.
  • the furnace had to be shut down to change the idler.
  • the annealing material had to be removed from the furnace beforehand. If not was possible, for example due to the excess length of the annealing material, the part of the annealing material that was in the furnace while changing the idler rollers was heated for an unacceptably long time and could not be used later. Due to the production shutdown during the idler roller change, this was relatively expensive.
  • the present invention is based on the object of providing a method and a device which enable a carrying roller change during the ongoing furnace operation, that is to say without interrupting the conveyance of the annealing material through the furnace.
  • the advantage resulting from the invention lies in the fact that relatively simple measures enable furnace operation to continue while the idlers are changed.
  • the change of idlers does not lead to a pro loss of production and is therefore less expensive than the previously known method for changing the idlers.
  • the axially parallel in the furnace 1 driven rollers 2 are in one plane and convey a strip 3 as annealing material in the direction of arrow 4 through the furnace 1, where it is annealed.
  • the supporting rollers 2 ' which are to be exchanged are adjacent supporting rollers 2 "raised so far above its normal working position that the belt 3 comes out of contact with the support roller 2 ', which can then be stopped and removed from the oven 1 without impairing the ongoing furnace operation and replaced by a newly inserted support roller 2.
  • the idler rollers 2 After completion of the idler roller replacement, the idler rollers 2 "are lowered from their raised position back into the working position, whereby the belt 3 comes back into contact with the replaced idler roller 2 '.
  • the support roller 2 'to be replaced is lowered until it comes out of contact with the strip 3 to be heated, whereupon it can be exchanged for a new support roller without disturbing the ongoing operation.
  • the strip 3 to be annealed is raised by means of a device 5, which generates compressed gas, such as compressed air, which is arranged below the support roller and which can optionally be displaced in the longitudinal direction of the furnace 1, in the region of the support roller 2 'to be replaced , after which it can be replaced.
  • compressed gas such as compressed air
  • a lifting and / or lowering device 6 is attached. indicates by means of which the support roller bearing 7 and, if appropriate, the rotary drive 8 of the support roller 2 'to be replaced can be raised or lowered by the amount h after loosening the bearing attachment on the side wall of the furnace 1. For this purpose, a correspondingly large cutout must be formed in the side wall of the furnace 1.
  • the position shown in FIG. 5 can be the lowered position of the support roller 2 'to be replaced, but can also be the starting position of the support rollers 2 "adjacent to the support roller 2' to be replaced, which are then raised by the amount h before the support roller change.
  • This Lifting the support rollers 2 can also be done by means of a crane, which makes a special lifting device unnecessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

1. A process for changing transport rollers in a roller-hearth furnace in which the transport roller (2) to be exchanged is taken out of the furnace before introduction of the new transport roller, characterized in that, during continuous conveying of heated material through the furnace, the heated material (3) in the region of the transport roller (2') to be exchanged is brought out of contact with this transport roller by lifting the heated material itself or by lowering the transport roller (2') to be exchanged and, after introduction of the new transport roller, is brought back into contact with the new transport roller.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Auswechseln von Tragrollen in Rollenherd-Durchlaufglühöfen während des laufenden Ofenbetriebs.The invention relates to a method and a device for replacing idlers in roller hearth continuous annealing furnaces during ongoing furnace operation.

In Rollenherd-Durchlaufglühöfen wird das Glühgut über drehbar angetriebene Tragrollen, die beidseitig in Lagern an den Seitenwänden des Ofens gelagert sind, durch den Ofen geführt und dabei geglüht.In roller hearth continuous annealing furnaces, the annealed material is passed through the furnace via rotatably driven idler rollers, which are supported on both sides in bearings on the side walls of the furnace, and annealed.

Wenn ein vorzeitiger Austausch einer beschädigten Tragrolle erforderlich wurde, mußte bisher der Ofen stillgesetzt werden, um den Tragrollen-Wechsel durchzuführen. Zuvor mußte das Glühgut aus dem Ofen entfernt werden. Falls dies nicht möglich war, z.B. wegen zu großer Restlänge des Glühguts, wurde der während des Tragrollen-Wechsels im Ofen befindliche Teil des Glühguts unzulässig lange erhitzt und konnte später nicht verwendet werden. Durch Produktionsstillstand während des Tragrollen-Wechsels war dieser verhältnismäßig kostenaufwendig.Previously, if an early replacement of a damaged idler was required, the furnace had to be shut down to change the idler. The annealing material had to be removed from the furnace beforehand. If not was possible, for example due to the excess length of the annealing material, the part of the annealing material that was in the furnace while changing the idler rollers was heated for an unacceptably long time and could not be used later. Due to the production shutdown during the idler roller change, this was relatively expensive.

Der vorliegenden Erfindung liegt nun die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zu schaffen, die einen Tragrollen-Wechsel während des laufenden Ofenbetriebs, also ohne Unterbrechung der Förderung des Glühguts durch den Ofen, ermöglichen.The present invention is based on the object of providing a method and a device which enable a carrying roller change during the ongoing furnace operation, that is to say without interrupting the conveyance of the annealing material through the furnace.

Zur Lösung dieser Aufgabe wird erfindungsgemäß ein Verfahren und eine Vorrichtung mit den in den Ansprüchen angegebenen Merkmalen vorgeschlagen. Für die praktische Ausführung des erfindungsgemäßen Verfahrens und der Vorrichtung gibt es verschiedene Varianten, von denen die wichtigsten im Zusammenhang mit den in der Zeichnung dargestellten Ausführungsbeispielen erläutert werden.To achieve this object, a method and a device with the features specified in the claims are proposed. There are various variants for the practical implementation of the method and the device according to the invention, the most important of which are explained in connection with the exemplary embodiments illustrated in the drawing.

Der sich durch die Erfindung ergebende Vorteil liegt darin, daß durch verhältnismäßig einfache Maßnahmen eine Fortsetzung des Ofenbetriebs während des Tragrollen-Wechsels ermöglicht wird. Der Tragrollen-Wechsel führt damit nicht zu einem Produktionsausfall und ist daher kostengünstiger als das bisher bekannte Verfahren zum Wechsel der Tragrollen.The advantage resulting from the invention lies in the fact that relatively simple measures enable furnace operation to continue while the idlers are changed. The change of idlers does not lead to a pro loss of production and is therefore less expensive than the previously known method for changing the idlers.

In der Zeichnung zeigen

  • Fig. 1 in schematischer Seitenansicht den Ofen im normalen Betrieb,
  • Fig. 2 ein Ausführungsbeispiel für den Wechsel einer Tragrolle,
  • Fig. 3 ein weiteres Ausführungsbeispiel für den Wechsel einer Tragrolle und
  • Fig. 4 ein weiteres Ausführungsbeispiel,
  • Fig. 5 einen Teilquerschnitt durch den Ofen.
Show in the drawing
  • 1 is a schematic side view of the furnace in normal operation,
  • 2 shows an embodiment for changing a support roller,
  • Fig. 3 shows another embodiment for changing a support roller and
  • 4 shows a further exemplary embodiment,
  • Fig. 5 shows a partial cross section through the furnace.

Gemäß Fig. 1 liegen die achsparallel im Ofen 1 drehbar angetriebenen Tragrollen 2 in einer Ebene und fördern ein Band 3 als Glühgut in Pfeilrichtung 4 kontinuierlich durch den Ofen 1 hindurch, wo es geglüht wird.According to Fig. 1, the axially parallel in the furnace 1 driven rollers 2 are in one plane and convey a strip 3 as annealing material in the direction of arrow 4 through the furnace 1, where it is annealed.

Gemäß dem in Fig. 2 dargestellten Ausführungsbeispiel sind die der auszuwechselnden Tragrolle 2' benachbarten Tragrollen 2" so weit über ihre normale Arbeitsstellung angehoben, daß das Band 3 außer Kontakt mit der Tragrolle 2' kommt, die dann stillgesetzt und ohne Beeinträchtigung des laufenden Ofenbetriebs aus dem Ofen 1 herausgenommen und durch eine neu eingesetzte Tragrolle 2 ersetzt werden kann. Nach Abschluß des Tragrollen-Wechsels werden die Tragrollen 2" aus ihrer angehobenen Lage wieder in die Arbeitsstellung abgesenkt, wodurch das Band 3 wieder in Kontakt mit der ausgewechselten Tragrolle 2' kommt.According to the exemplary embodiment shown in FIG. 2, the supporting rollers 2 'which are to be exchanged are adjacent supporting rollers 2 "raised so far above its normal working position that the belt 3 comes out of contact with the support roller 2 ', which can then be stopped and removed from the oven 1 without impairing the ongoing furnace operation and replaced by a newly inserted support roller 2. After completion of the idler roller replacement, the idler rollers 2 "are lowered from their raised position back into the working position, whereby the belt 3 comes back into contact with the replaced idler roller 2 '.

Bei dem in Fig. 3 dargestellten Ausführungsbeispiel wird die auszuwechselnde Tragrolle 2' so weit abgesenkt, bis sie außer Kontakt mit dem zu glühenden Band 3 kommt, worauf sie gegen eine neue Tragrolle ausgewechselt werden kann, ohne daß der laufende Betrieb gestört wird.In the embodiment shown in Fig. 3, the support roller 2 'to be replaced is lowered until it comes out of contact with the strip 3 to be heated, whereupon it can be exchanged for a new support roller without disturbing the ongoing operation.

Fig. 4 zeigt ein weiteres Ausführungsbeispiel, bei dem das zu glühende Band 3 mittels einer Druckgas-,etwa Druckluft, erzeugenden, unterhalb der Tragrolleri angeordneten, gegebenenfalls in Längsrichtung des Ofens 1 verschiebbaren Vorrichtung 5 im Bereich der auszuwechselnden Tragrolle 2' von dieser abgehoben wird, wonach sie ausgewechselt werden kann.4 shows a further exemplary embodiment, in which the strip 3 to be annealed is raised by means of a device 5, which generates compressed gas, such as compressed air, which is arranged below the support roller and which can optionally be displaced in the longitudinal direction of the furnace 1, in the region of the support roller 2 'to be replaced , after which it can be replaced.

In Fig. 5 ist eine Hub- und/oder Absenkvorrichtung 6 ange-. deutet, mittels der das Tragrollen-Lager 7 und gegebenenfalls der Drehantrieb 8 der auszuwechselnden Tragrolle 2' nach Lösen der Lagerbefestigung an der Seitenwand des Ofens 1 um den Betrag h angehoben oder abgesenkt werden kann. Hierzu muß ein entsprechend großer Ausschnitt in der Seitenwand des Ofens 1 gebildet sein.5, a lifting and / or lowering device 6 is attached. indicates by means of which the support roller bearing 7 and, if appropriate, the rotary drive 8 of the support roller 2 'to be replaced can be raised or lowered by the amount h after loosening the bearing attachment on the side wall of the furnace 1. For this purpose, a correspondingly large cutout must be formed in the side wall of the furnace 1.

Die in Fig. 5 gezeigte Lage kann die abgesenkte Stellung der auszuwechselnden Tragrolle 2' sein, jedoch auch die Ausgangsstellung der zu der auszuwechselnden Tragrolle 2' benachbarten Tragrollen 2" sein, die vor dem Tragrollen-Wechsel dann um den Betrag h angehoben werden. Dieses Anheben der Tragrollen 2" kann auch mittels Kran erfolgen, wodurch eine besondere Hubvorrichtung entbehrlich wird.The position shown in FIG. 5 can be the lowered position of the support roller 2 'to be replaced, but can also be the starting position of the support rollers 2 "adjacent to the support roller 2' to be replaced, which are then raised by the amount h before the support roller change. This Lifting the support rollers 2 "can also be done by means of a crane, which makes a special lifting device unnecessary.

Claims (5)

1. Verfahren zum Auswechseln von Tragrollen in Rollenherddurchlauföfen während des laufenden Ofenbetriebs, dadurch gekennzeichnet, daß das im Bereich der auszuwechselnden Tragrolle befindliche Glühgut durch Anheben des Glühgutes selbst oder durch Absenken der auszuwechselnden Tragrolle außer Kontakt mit dieser Tragrolle gebracht und diese dann aus dem Ofen genommen und eine neue Tragrolle eingesetzt wird, worauf der Kontakt zwischen der neuen Tragrolle und dem Glühgut wieder hergestellt wird.1. A method for replacing idlers in roller hearth continuous furnaces during ongoing furnace operation, characterized in that the annealing material located in the region of the idler roller to be replaced is brought out of contact with this idler roller by lifting the annealing material itself or by lowering the idler roller to be replaced and then removed from the furnace and a new support roller is inserted, whereupon the contact between the new support roller and the annealing material is restored. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß mindestens eine der beiden der auszuwechselnden Tragrolle benachbarten Tragrollen so weit angehoben wird, bis das Glühgut außer Kontakt mit der auszuwechselnden Tragrolle kommt.2. The method according to claim 1, characterized in that at least one of the two of the support roller to be replaced adjacent support rollers is raised until the annealed material comes out of contact with the support roller to be replaced. 3. Verfahren nach. Anspruch 1, dadurch gekennzeichnet, daß die auszuwechselnde Tragrolle im Ofen so weit abgesenkt wird, bis sie außer Kontakt mit dem Glühgut ist, worauf sie ausgewechselt wird und die neu eingesetzte bis zur Berührung mit dem Glühgut in ihre Arbeitsstellung angehoben wird.3. Procedure according to. Claim 1, characterized in that the support roller to be replaced is lowered in the furnace until it is out of contact with the annealing material, whereupon it is replaced and the newly inserted one is raised into its working position until it comes into contact with the annealing material. 4. Vorrichtung zur Ausübung des Verfahrens nach Anspruch 1, gekennzeichnet durch das Glühgut (3) von der auszuwechselnden Tragrolle (2') abhebende Druckgasdüsen (5).4. Apparatus for performing the method according to claim 1, characterized by the annealing material (3) from the supporting roller (2 ') to be lifted off by pressurized gas nozzles (5). 5. Vorrichtung zur Ausübung des Verfahrens nach einem der Ansprüche 2 oder 3, gekennzeichnet durch an den Lagern (7) und/oder Drehantrieben (8) der Tragrollen (2) angreifende Hub- bzw. Absenkvorrichtungen (6).5. Device for carrying out the method according to one of claims 2 or 3, characterized by lifting or lowering devices (6) acting on the bearings (7) and / or rotary drives (8) of the support rollers (2).
EP81100181A 1980-02-09 1981-01-13 Process and apparatus for changing transport rollers in a roller-hearth furnace Expired EP0033845B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3004805A DE3004805C2 (en) 1980-02-09 1980-02-09 Method and device for replacing support rollers in roller hearth continuous annealing furnaces
DE3004805 1980-02-09

Publications (2)

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EP0033845A1 true EP0033845A1 (en) 1981-08-19
EP0033845B1 EP0033845B1 (en) 1988-01-07

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080290A1 (en) * 1981-11-19 1983-06-01 Armco Inc. Lift-off means and method for use with a horizontal continuous hearth roll furnace for the treatment of metallic strip
EP0101931A1 (en) * 1982-08-13 1984-03-07 Ruhrgas Aktiengesellschaft Roller exchanging process in a continuous roller hearth furnace, and furnace for the application of it
WO1989003967A1 (en) * 1987-10-23 1989-05-05 Ruhrgas Aktiengesellschaft Process and device for cleaning the surface of the rollers of a roller hearth furnace
EP0352533A2 (en) * 1988-07-23 1990-01-31 Drever International S.A. Device for the transport of strip metal, particularly high grade strip metal, in the furnaces of annealing or pickling lines
EP3048402A1 (en) * 2015-01-20 2016-07-27 LOI Thermprocess GmbH Support roller exchange device
US9976598B2 (en) 2015-01-20 2018-05-22 Loi Thermprocess Gmbh Roller bearing replacement device and process for replacing roller bearings
US10830536B2 (en) 2018-03-15 2020-11-10 Ford Motor Company Roller transport assembly for transporting rollers to and from a roller hearth furnace

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4203395C2 (en) * 1992-02-06 1993-11-25 Didier Ofu Eng Method for guiding thin slabs, sheets and steel strips to be heated in high-temperature roller hearth furnaces and high-temperature roller hearth furnace for carrying out the method
FR2760077B1 (en) * 1997-02-27 1999-04-30 Stein Heurtey DEVICE FOR ENSURING THE REPLACEMENT OF A TAPE SUPPORT ROLLER IN A HEAT TREATMENT OVEN
AT14592U1 (en) * 2015-01-20 2016-02-15 Loi Thermprocess Gmbh Bearing roller changing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2872174A (en) * 1954-01-08 1959-02-03 Drever Co Roller furnace construction and method of maintenance operation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1232997B (en) * 1963-05-09 1967-01-26 Ofu Ofenbau Union G M B H Roller hearth for a roller hearth furnace for the heat treatment of, in particular, metallic goods
US3328861A (en) * 1965-06-24 1967-07-04 Pullman Inc Roller hearth tunnel kilns

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2872174A (en) * 1954-01-08 1959-02-03 Drever Co Roller furnace construction and method of maintenance operation

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080290A1 (en) * 1981-11-19 1983-06-01 Armco Inc. Lift-off means and method for use with a horizontal continuous hearth roll furnace for the treatment of metallic strip
EP0101931A1 (en) * 1982-08-13 1984-03-07 Ruhrgas Aktiengesellschaft Roller exchanging process in a continuous roller hearth furnace, and furnace for the application of it
WO1989003967A1 (en) * 1987-10-23 1989-05-05 Ruhrgas Aktiengesellschaft Process and device for cleaning the surface of the rollers of a roller hearth furnace
EP0352533A2 (en) * 1988-07-23 1990-01-31 Drever International S.A. Device for the transport of strip metal, particularly high grade strip metal, in the furnaces of annealing or pickling lines
EP0352533A3 (en) * 1988-07-23 1991-01-16 Drever International S.A. Device for the transport of strip metal, particularly high grade strip metal, in the furnaces of annealing or pickling lines
EP3048402A1 (en) * 2015-01-20 2016-07-27 LOI Thermprocess GmbH Support roller exchange device
US9976598B2 (en) 2015-01-20 2018-05-22 Loi Thermprocess Gmbh Roller bearing replacement device and process for replacing roller bearings
US10072709B2 (en) 2015-01-20 2018-09-11 Loi Thermprocess Gmbh Carrier roller bearing system of a carrier roller of a roller hearth furnace, carrier roller handling system for switching roller bearings and process for switching roller bearings
US10161455B2 (en) 2015-01-20 2018-12-25 Loi Thermprocess Gmbh Roller bearing replacement device and process for switching roller bearings
US10161454B2 (en) 2015-01-20 2018-12-25 Loi Thermprocess Gmbh Roller bearing replacement device
US10830536B2 (en) 2018-03-15 2020-11-10 Ford Motor Company Roller transport assembly for transporting rollers to and from a roller hearth furnace

Also Published As

Publication number Publication date
DE3004805C2 (en) 1981-12-10
DE3004805A1 (en) 1981-10-01
EP0033845B1 (en) 1988-01-07
DE3176595D1 (en) 1988-02-11

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