US3927959A - Free floating flight in a retort and method - Google Patents

Free floating flight in a retort and method Download PDF

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Publication number
US3927959A
US3927959A US503731A US50373174A US3927959A US 3927959 A US3927959 A US 3927959A US 503731 A US503731 A US 503731A US 50373174 A US50373174 A US 50373174A US 3927959 A US3927959 A US 3927959A
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United States
Prior art keywords
flight
retort
helical
heating surface
heating
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Expired - Lifetime
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US503731A
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English (en)
Inventor
Harold E Mescher
Walter E Heyer
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Pacific Scientific Co
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Pacific Scientific Co
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Priority to US503731A priority Critical patent/US3927959A/en
Priority to CA233,970A priority patent/CA1057052A/fr
Priority to DE19752538356 priority patent/DE2538356A1/de
Priority to JP50105552A priority patent/JPS5150804A/ja
Priority to FR7527322A priority patent/FR2283955A1/fr
Priority to GB36583/75A priority patent/GB1525752A/en
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Publication of US3927959A publication Critical patent/US3927959A/en
Assigned to FIRST PENNSYLVANIA BANK N A, A NATIONAL BANKING ASSOCIATION reassignment FIRST PENNSYLVANIA BANK N A, A NATIONAL BANKING ASSOCIATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SELAS CORPORATION OF AMERICA A CORP OF PA
Assigned to SELAS CORPORATION OF AMERICA A CORP. OF PA reassignment SELAS CORPORATION OF AMERICA A CORP. OF PA RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: FIRST PENNSYLVANIA BANK N.V., FOR ITSELF AND AS AGENT FOR THE PHILADELPHIA NATIONAL BANK
Assigned to BANCBOSTON FINANCIAL COMPANY reassignment BANCBOSTON FINANCIAL COMPANY SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SELAS CORPORATION OF AMERICA
Assigned to SELAS CORPORATION OF AMERICA reassignment SELAS CORPORATION OF AMERICA RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANCBOSTON FINANACIAL COMPANY A MA TRUST
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/14—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
    • F27B7/18—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being movable within the drum

Definitions

  • This invention relates to the field of heat treating furnaces and more particularly is directed to a rotary retort used for continuous processing of workpieces, requiring controlled heat treating to produce, for example, carburizing, carbonitriding, carbon restoration or hardening.
  • the flight or spiral which is mounted on the interior surface of the cylindrical retort is designed to move the workpieces from one end of the cylindrical retort to the other end.
  • the retorts used for the continuous processing of workpieces have generally been heavy walled rough cast retorts with cast-in spirals or have been fabricated retorts of wrought materials with the internal spiral welded directly to the cylindrical shell.
  • the presence of these and other typical conditions may cause the premature failure of the retort by cracking occurring adjacent the intersection of the flight and the shell.
  • the failure will appear as a spiral crack in the retort following the path of the flight while in the flight the cracking is radially due to the temperature difference from the inside to the outside diameter of the flight, wherein the outside diameter of the flight is welded to the shell.
  • the present invention comprises a pair of helical strips which are secured to the interior surface of the retort on opposite sides of the flight for holding the flight adjacent to the interior surface of the retort.
  • the flight is not directly connected to the interior surface of the retort and, therefore, is free to move relative to the interior surface of the retort.
  • the pair of helical strips do not protrude as far from the interior surface of the retort as the flight. Since the flight is free floating," no thermal stresses develop between the flight and the retort due to temperature differentials. Because the strips are essentially small, narrow bands, very little temperature difference can exist across them, and thus the bands and the retort are kept at essentially the same temperature.
  • the retort shell can be constructed of less ductile and less expensive materials. Furthermore, the desirable smooth bore features of the retort as required by certain workpieces is retained, so that none of the parts or workpieces will become caught in the retort and become mixed with subsequent parts of a different configuration.
  • This invention allows for the easy placement of the flight within the retort, by first tack welding the strips to opposite sides of the flight, and then connecting the two strips permanently to the interior surface of the retort shell by continuous welds.
  • the tack welds between the flight and the strips are readily broken by the first thermally produced stresses on the parts, thus permitting the flight to move between the strips.
  • FIG. 1 is a partial sectional view of a rotary retort heat treating furnace
  • FIG. 2 is a partial perspective view of the flight attached to the retort shell.
  • the cylindrical retort I0 is shown mounted in a heat treating furnace 12 supported by the legs 14.
  • a heating chamber 16 which heats the outer surface or shell 18 of the retort l0.
  • a circular plate 20 Positioned on one end 19 of the retort 10 is a circular plate 20 having an entry port 22 for receiving workpieces.
  • a series of discharge ribs 24 are located at the other end 23 of the retort 10 adjacent a discharge chute 26 for directing the exiting workpieces.
  • a flight or spiral 30 Positioned on the interior surface 28 of the retort I0 is a flight or spiral 30 which proceeds in a helical orien tation from adjacent one end 19 of the retort to adjacent the other end 23.
  • the flight or flange member 30 is held in position on the interior surface 28 of the retort 10 by a pair of helical guide strips or bands 32 and 34.
  • the lower surface 46 of the guide strip 34 is secured to the interior surface 28 of the retort by a continuous weld 48 and the bottom surface 50 of the guide strip 32 is also secured to the interior 28 by a continuous weld 52.
  • the outside edge 54 of the flight 30 is positioned closely adjacent the interior surface 28, but is not attached to that surface. There is no gap between the inside surface 56 of the strip 34 and the side 40 of the flight 30. Similarly, there is no gap between inside surface 58 of the strip 32 and the side 44 of the flight 30. Thisjuxtaposed relation of the strips 32 and 34 along the flight 30 is to insure that no foreign matter or workpieces can become lodged between the strips 32 and 34 and the flight 30.
  • the flight 30 is preferably a single continuous flight extending from the one end 19 of the retort in a spiral direction to the other end 23 of the retort.
  • orientation and construction of the helical strips 32 and 34 adjacent the flight 30 allow for relative movement of the flight with respect to said retort 10 in a direction generally normal to said retort surface 28 while preventing relative movement of the flight with respect to the retort in a direction generally parallel to the general direction of workpieces moving through the retort from the entry port 22 to the discharge end 23.
  • the top portion 36 of strip 34 is tack welded at spaced locations 38 to one side 40 of the flight 30 while the top portion 42 of the strip 32 is similarly tack welded at spaced locations 43 to the other side 44 of flight 30. Then, the flight with the attached strips is placed within the retort adjacent the interior surface 28.
  • the strips 32 and 34 are respectively welded securely to the interior surface 28 by the continuous welds 52 and 48 which follow the spiral path of the helical strips 32 and 34 throughout their placement within the retort.
  • the spaced tack welds 38 and 43 are designed to break after the retort is in operation in order to allow the flight to be in a "free floating" orientation with respect to the retort and the strips 32 and 34.
  • the spiral configuration of the flight causes it to support itself against the interior surface 28 of the retort.
  • the flight is welded at each of its extreme ends 60 and 62 to the interior surface of the retort in order to anchor it within the retort.
  • a heat treatment device for treating workpieces comprising:
  • a heat treatment device as defined in claim 1 wherein said maintaining means comprises:
  • a heat treating apparatus comprising:
  • a heating apparatus comprising:
  • a heating apparatus as defined in claim 5 wherein said holding means comprises a pair of track members secured to said heating surface forming a groove for receipt of said flight, said track members being parallel and following the path of said continuous helical flight member, said flight member being able to expand and contract relative to said heating surface without causing thermal stress cracking in said flight member and said heating surface adjacent their interface.
  • a heating device for treating workpieces moving in a direction from an entry port to a discharge end comprising:
  • said holding means preventing relative movement between said flange and said surface in a direction generally parallel with said direction of said moving workpieces while allowing said flange to move with respect to said surface in a direction generally perpendicular to said direction of said moving workpieces, so that temperature differentials between said heating surface and said flange member will not cause failure in said heating surface and said flange member adjacent their interface.
  • a heat treatment furnace comprising: a cylindrical retort; a pair of helical strips secured in parallel and spaced relation to each other on the interior surface of said retort; and
  • said flight member being movable relative to said interior surface of said retort to allow said flight member to freely expand and contract relative to said retort to prevent thermal stress cracking in said retort and said flight member adjacent their interface.
  • a method of placing a helical flight on the interior surface of a cylindrical heating retort to allow said flight to move relative to said retort comprising the steps of:
  • a method of placing a helical flight on the interior surface of a cylindrical heat treating retort comprising the step of positioning said helical flight on said surface by a pair of spaced helical strips a helical flight member positioned within said pair of Secured the surface in a manner to confine the flight while allowing the flight to move relative to said retort.
  • a heat treatment device for treating workpieces comprising:
  • heating surface located on said heating surface for directing said workpieces along said heating surface; and means connected to and extending away from said heating surface adjacent said guide means for maintaining the location of said guide means on said heating surface, said maintaining means being in juxtaposed relation along said guide means and allowing said guide means to move relative to said heating surface so that any temperature differential between said heating surface and said guide means will not cause thermal stress cracks in said heating surface and said guide means adjacent their interface.
  • a heat treating apparatus comprising:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Screw Conveyors (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Articles (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
US503731A 1974-09-06 1974-09-06 Free floating flight in a retort and method Expired - Lifetime US3927959A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US503731A US3927959A (en) 1974-09-06 1974-09-06 Free floating flight in a retort and method
CA233,970A CA1057052A (fr) 1974-09-06 1975-08-22 Separation flottante dans une cornue
DE19752538356 DE2538356A1 (de) 1974-09-06 1975-08-28 Waermebehandlungsvorrichtung mit sich frei bewegender foerderschraube und verfahren zur anordnung der foerderschraube in der vorrichtung
JP50105552A JPS5150804A (en) 1974-09-06 1975-08-30 Netsushorisochi oyobi sonokumitatehoho
FR7527322A FR2283955A1 (fr) 1974-09-06 1975-09-05 Dispositif de traitement thermique equipe interieurement d'une rampe mobile et procede de montage de la rampe
GB36583/75A GB1525752A (en) 1974-09-06 1975-09-05 Free floating flight in a retort

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US503731A US3927959A (en) 1974-09-06 1974-09-06 Free floating flight in a retort and method

Publications (1)

Publication Number Publication Date
US3927959A true US3927959A (en) 1975-12-23

Family

ID=24003283

Family Applications (1)

Application Number Title Priority Date Filing Date
US503731A Expired - Lifetime US3927959A (en) 1974-09-06 1974-09-06 Free floating flight in a retort and method

Country Status (6)

Country Link
US (1) US3927959A (fr)
JP (1) JPS5150804A (fr)
CA (1) CA1057052A (fr)
DE (1) DE2538356A1 (fr)
FR (1) FR2283955A1 (fr)
GB (1) GB1525752A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2325006A1 (fr) * 1975-09-22 1977-04-15 Sunbeam Equip Four a cornue rotative et son procede de realisation
US4259060A (en) * 1979-10-15 1981-03-31 Agf Inc. Discharge end structure for rotary retorts

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2198519B (en) * 1986-12-04 1990-10-03 John Hall Improved solid fuel burner
DE102008019835A1 (de) 2008-04-19 2009-10-29 Lwb Refractories Gmbh Drehrohrofen mit einer feuerfesten Auskleidung und Zustellung für einen solchen Drehrohrofen
DE102012006032A1 (de) 2012-03-27 2013-10-02 Mbb Fertigungstechnik Gmbh Verfahren zur Herstellung eines flächigen Prepreg-Materialzuschnitts

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1179952A (en) * 1916-01-11 1916-04-18 Mathieson Alkali Works Rotary kiln.
US3351181A (en) * 1965-12-23 1967-11-07 Kenneth M Allen Conveyors of granular material
US3441259A (en) * 1967-09-01 1969-04-29 Pacific Scientific Co Heat treating furnace
US3556498A (en) * 1969-01-08 1971-01-19 Duraloy Co The Heat treating retort with helix

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1179952A (en) * 1916-01-11 1916-04-18 Mathieson Alkali Works Rotary kiln.
US3351181A (en) * 1965-12-23 1967-11-07 Kenneth M Allen Conveyors of granular material
US3441259A (en) * 1967-09-01 1969-04-29 Pacific Scientific Co Heat treating furnace
US3556498A (en) * 1969-01-08 1971-01-19 Duraloy Co The Heat treating retort with helix

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2325006A1 (fr) * 1975-09-22 1977-04-15 Sunbeam Equip Four a cornue rotative et son procede de realisation
US4069007A (en) * 1975-09-22 1978-01-17 Sunbeam Equipment Corporation Rotary retort furnace
US4259060A (en) * 1979-10-15 1981-03-31 Agf Inc. Discharge end structure for rotary retorts
DE3028952A1 (de) * 1979-10-15 1981-04-23 AGF, Inc., Elizabeth, N.J. Ausstossende fuer drehretorten

Also Published As

Publication number Publication date
DE2538356A1 (de) 1976-03-25
FR2283955A1 (fr) 1976-04-02
GB1525752A (en) 1978-09-20
JPS5335847B2 (fr) 1978-09-29
CA1057052A (fr) 1979-06-26
JPS5150804A (en) 1976-05-04

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AS Assignment

Owner name: FIRST PENNSYLVANIA BANK N A 19TH FL.CENTRE SQ WEST

Free format text: SECURITY INTEREST;ASSIGNOR:SELAS CORPORATION OF AMERICA A CORP OF PA;REEL/FRAME:003997/0981

Effective date: 19820217

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Owner name: SELAS CORPORATION OF AMERICA A CORP. OF PA

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:FIRST PENNSYLVANIA BANK N.V., FOR ITSELF AND AS AGENT FOR THE PHILADELPHIA NATIONAL BANK;REEL/FRAME:004096/0520

Effective date: 19821231

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Owner name: BANCBOSTON FINANCIAL COMPANY, 100 FEDERAL STREET,

Free format text: SECURITY INTEREST;ASSIGNOR:SELAS CORPORATION OF AMERICA;REEL/FRAME:004557/0143

Effective date: 19860529

Owner name: BANCBOSTON FINANCIAL COMPANY,MASSACHUSETTS

Free format text: SECURITY INTEREST;ASSIGNOR:SELAS CORPORATION OF AMERICA;REEL/FRAME:004557/0143

Effective date: 19860529

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Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANCBOSTON FINANACIAL COMPANY A MA TRUST;REEL/FRAME:004945/0988

Effective date: 19880805

Owner name: SELAS CORPORATION OF AMERICA, PENNSYLVANIA

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANCBOSTON FINANACIAL COMPANY A MA TRUST;REEL/FRAME:004945/0988

Effective date: 19880805