US3905758A - Heat treatment tunnel kiln for products having a circular cross-section - Google Patents

Heat treatment tunnel kiln for products having a circular cross-section Download PDF

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Publication number
US3905758A
US3905758A US486256A US48625674A US3905758A US 3905758 A US3905758 A US 3905758A US 486256 A US486256 A US 486256A US 48625674 A US48625674 A US 48625674A US 3905758 A US3905758 A US 3905758A
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United States
Prior art keywords
treating zone
zone
cylindrical
tunnel kiln
main
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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
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US486256A
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English (en)
Inventor
Jean Moussou
Robert Calvet
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Ceraver SA
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Ceraver SA
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Priority to US05/597,788 priority Critical patent/US3982888A/en
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Publication of US3905758A publication Critical patent/US3905758A/en
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Classifications

    • 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
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F27B9/021—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces having two or more parallel tracks
    • F27B9/022—With two tracks moving in opposite directions
    • F27B9/023—With two tracks moving in opposite directions with a U turn at one end
    • 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
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • 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
    • F27B9/22—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 on rails, e.g. under the action of scrapers or pushers
    • F27B9/227—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 on rails, e.g. under the action of scrapers or pushers with rotation of the charge
    • 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
    • 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 being carried by a conveyor
    • 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
    • F27D5/00—Supports, screens or the like for the charge within the furnace
    • F27D5/0068—Containers
    • 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
    • F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
    • F27B9/045—Furnaces with controlled atmosphere
    • 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
    • F27B9/12—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity with special arrangements for preheating or cooling the charge
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0085—Movement of the container or support of the charge in the furnace or in the charging facilities
    • F27D2003/0089—Rotation about a horizontal or slightly inclined axis
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0085—Movement of the container or support of the charge in the furnace or in the charging facilities
    • F27D2003/0096—Advancement along the longitudinal axis of the workpiece
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0085—Movement of the container or support of the charge in the furnace or in the charging facilities
    • F27D2003/0097—Advancement along an axis perpendicular to the axis of the workpiece

Definitions

  • HEAT TREATMENT TUNNEL KILN FOR PRODUCTS HAVING A CIRCULAR CROSS-SECTION The present invention concerns a tunnel kiln for the heat treatment of products having a circular crosssection, comprising a main zone provided with means for making the products flow perpendicular to their longitudinal axis ans means for subjecting them at the same time to a rotation about that longitudinal axis by rolling in cylinders. It applies more particularly to kilns for the continuous sintering of long cylindrical ceramic parts in a definite atmosphere.
  • the tunnel kiln according to the invention is characterized in that it comprises, moreover, at least one zone besides the main zone and in that the latter and the other zone may be formed connected to different gas flow devices.
  • the main zone and the other zone are conntected to each other by a chamber which may be isolated either from the one or from the other, in a gas-tight manner.
  • the other zone is provided with means for making the products circulate parallel to their longitudinal axis.
  • the other zone comprises, moreover, means for subjecting the products to a rotation about their longitudinal axis.
  • the means for starting up the rotation of the prodacts in the other zone are constituted by helical grooves fast with the cylindrical supports of the products and lugs engaged in these grooves, fast with the inside wall of the said other zone.
  • the other zone is provided with slide rails for the on culating of the cylindrical supports of the products and the chamber is provided with mobile slide rails which may be brought into the extension of the slide rails of the other zone or be moved away therefrom when the chamber is isolated from the said other zone.
  • the circulating directions in the main zone and in the other zone are perpendicular to each other.
  • It comprises preliminary heat treatment and final heat treatment zones provided with means for making the products circulate parallel to their longitudinal axis, arranged on either side of the main zone.
  • the products are arranged in cylindrical supports provided with means for longitudinal spacing apart, the inside surface of the other zone being provided with seal rings along the outside surface of the supports, arranged in pairs, the distance between the seal rings of one pair being greater than the length of the longitudinal means for spacing the supports apart.
  • FIG. 1 is a diagrammatic plane view of a kiln comprising a preliminary treatment zone and a final treatment zone for circulating products parallel to their axis, and a main treatment zone for circulating products perpendicular to their axis.
  • FIG. 2 is a cutaway view through the axis AA in FIG. 1.
  • FIG. 3 is a perspective view of a cylindrical support moving in the preliminary treatment zone, as well as its connection of with the following support.
  • FIG. 4 is a cutaway view, through the axis of the preliminary treatment zone of the kiln, of two successive cylindrical supports crossing through a pair of sealing rings.
  • FIG. 5 is a cutaway view through the axis BB in FIG. 4.
  • the kiln according to the embodiment described comprises three zones 1, 2, 3.
  • the preliminary treatment zone 1 and final treatment (cooling) zone 2 are arranged parallel and connected by the transversal treatment zone 3.
  • the cylindrical supports 4 move longitudinally.
  • these supports move perpendicularly to their axis.
  • the products 5 to be fired are arranged in the supports 4 made in the form of drums, as shown in FIG. 3.
  • the supports arranged in a contiguous line in zones 1 and 2 are moved by push jacks 6 and 7.
  • Zones 1 and 2 are separated from zone 3 by two chambers 8 and 9, each formed by two gates l0, l1 and l2, 13, the gates 11 and 13 being closed when the gates 10 and 12 are open and viceversa.
  • Pairs of resilient seals made of carbon felt such as 18, 19 and 20, 21 provide fluid-tight sealing between the inside walls of zones 1 and 2 and the outside surface of the supports 4. These seals, shown more clearly in FIGS. 3 and 5, are arranged in pairs spaced in such a way that if one is between two neighbouring faces of two successive supports 4, the other bears on the outside surface of one support or the other. The distance between one pair of seals and the next is equal to the distance between the front ends of two successive supports.
  • Zone I and 2 are equipped with slide rails 22 (FIG. 5) guiding the axial movement of the supports 4.
  • the chamber 8 is fitted with mobile slide rails 33 which may be moved by means of sealed control devices (not shown) so as to come into contact with the adjacent end of the slide rails 22 in zone 1.
  • the chamber 9 is also fitted with slide rails 34 similar to the slide rails 22 in zone 1 which they extend with an interruption enabling the closing of the gate 11.
  • the supports 4 are in the form of drums provided with a shaft 23 adapted to transmit the thrust efforts of the push jacks 6 and 7.
  • Two distance pieces 24 are mounted for free rotation on the protruding stub of each shaft 23 on each support 4.
  • the combined length of each pair of distance pieces 24 is slightly greater than the diameter of the associated support 4, but their width is slighter than the latter, so as not to interfere with the slide rails 22.
  • the supports 4 are provided with helical grooves 25 (FIG. 3). Lugs 26 fixed to the inside walls of the kiln are received in the grooves 25. During the linear movement of the support 4, the reaction of the lugs 26 on the walls of the grooves 25 impose on the supports 4 a rotating movement depending on the pitch of the helical groove.
  • This slight distance is imperceptible in H65. 1 and 2, but it enables the supports 4 to move by rolling on the hearth 36, eliminating all detrimental sliding or friction between adjacent supports 4.
  • the registry of the distance pieces 24 can be maintained by various simple expedients, such as, for instance, locating the center of gravity of the distance pieces 24 directly be neath their respective shafts 23 so that the distance pieces 24 will automatically remain horizontal as the supports 4 roll on their peripheries.
  • a particular atmosphere may be provided and maintained by an independent flow of gas for which only the input orifices 27, 28, 29 and output orifices 30, 31, 32 are shown.
  • the chambers 8 and 9 are provided also with a gas flow enabling, before any opening of gates, the removal of the atmosphere prevailing therein to let in an atmo sphere balanced with that of the zone which will communicate with the chamber.
  • the chamher will be given the volume which is the closest to that of the support, compatible with the requirements of manoeuvring.
  • the gate 10 is opened and the slide rails 33 are brought forward in contact with the slide rails 22 in zone 1.
  • the jack 6 is started up.
  • the column of supports 4 situated in the zone 1 moves by a length slightly greater than the overall length of a support 4.
  • the slide rails 33 are withdrawn into the chamber 8 so as to permit the passage of the gate 10, which is closed again.
  • the atmosphere of the chamber 8 is then balanced with that of zone 3.
  • the atmosphere of the chamber 9 is balanced with that of zone 2.
  • the gate 12 is opened, and the slide rails 34 are brought forward in contact with the slide rails 22 in zone 2.
  • the jack 7 is started up; under its thrust, the cylindrical support 4 contained in the chamber 9 is brought into contact with the column of supports contained in the zone 2, then the column is pushed along a distance equal to the length of a support.
  • the jack 7 and the slide rails are then retracted, and; the gate 12 is closed again.
  • the atmosphere of the chamber 9 is balanced with that of zone 3.
  • the gates 11 and 13 are opened.
  • the push rod 35 is brought into action.
  • the cylindrical support 4 is contained in the chamber 8 rolls on one of the slide rails 33, then comes again into contact by its distance pieces 24 with the distant pieces of the neighboring cylindrical support 4 contained in zone 3.
  • the supports 4 contained in that zone constitute a layer of non-tangent cylinders spaced apart regularly by the distance pieces.
  • a retractable arm (not shown) may be provided to stop the supports 4 other than the one at the head of the column from continuing to roll to the point where they would interfere with the gate 13 after the push rod 35 has reached the end of its stroke.
  • the support 4 at the head of the layer being moved has reached a position on the sloping part of one of the slide rails 34, after which it continues to roll under the influence of gravity until it has reached its balance position in the chamber 9.
  • the gates 11 and 13 are closed again.
  • the atmospheres of the chambers 8 and 9 are balanced with those of zones 1 and 2.
  • a support containing products to be fired is brought into the column of supports 4 in zone 1.
  • a cylindrical support containing the fired products is removed from the column in zone 2. Subsequently the operations may begin again.
  • the number of zones of the kiln may be other than three, the kiln assuming the form of a L when it comprises only two zones or being able to comprise, moreover, more than three zones.
  • the supports may be constituted by isolated tubes or tubes fitted together in drums. They may optionally be or not be provided with one or several helical grooves having different pitches. They themselves may be arranged in a tube or an armature through which they cross, that tube or that armature themselves being driven in a rotating movement about their axis and arranged in a zone of the kiln.
  • the structure of the supports and the general structure of the kiln may have characteristics which are the object of the previously mentioned British patent application No. 18,963/74 of 30th April, 1974.
  • the flowing and the purifying of the gases in that zone of the kiln may comprise the arrangements which are the object of British patent application No.
  • a tunnel kiln comprising:
  • a. a plurality of cylindrical supports, each of which contains a plurality of cavities shaped to receive objects to be heat treated;
  • a first chamber connecting said main treating zone to said second treating zone, said first chamber being adapted to receive at least one of said cylindrical support at a time;
  • h. means for isolating said first chamber in a gas-tight manner from either said main treating zone or said second treating zone.
  • a tunnel kiln as claimed in claim 2 wherein said means in said second treating zone for rotating said cylindrical supports about their longitudinal axes during their translational movement in said second treating zone comprises helical grooves in said cylindrical supports and lugs mounted on the inside wall of said second treating zone and received in the helical grooves in said cylindrical support.
  • a second chamber connecting said main treating zone to said third treating zone, said second chamber being adapted to receive at least one of said cylindrical support at a time;
  • each of the cavities in said cylindrical supports is shaped to receive a single cylindrical product the longitudinal axis of which is parallel to the longitudinal axis of the cylindrical support in which it is received.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
US486256A 1973-07-13 1974-07-05 Heat treatment tunnel kiln for products having a circular cross-section Expired - Lifetime US3905758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US05/597,788 US3982888A (en) 1973-07-13 1975-07-21 Heat treatment tunnel kiln for products having a circular cross-section

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7325851A FR2237535A5 (enrdf_load_stackoverflow) 1973-07-13 1973-07-13

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/597,788 Continuation US3982888A (en) 1973-07-13 1975-07-21 Heat treatment tunnel kiln for products having a circular cross-section

Publications (1)

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US3905758A true US3905758A (en) 1975-09-16

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Country Status (4)

Country Link
US (1) US3905758A (enrdf_load_stackoverflow)
DE (1) DE2433383A1 (enrdf_load_stackoverflow)
FR (1) FR2237535A5 (enrdf_load_stackoverflow)
GB (1) GB1474786A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982888A (en) * 1973-07-13 1976-09-28 Ceraver Heat treatment tunnel kiln for products having a circular cross-section
US4047886A (en) * 1975-11-24 1977-09-13 Commissariat A L'energie Atomique Furnace for the continuous sintering of pellets of ceramic nuclear fuel material
US4106894A (en) * 1975-12-19 1978-08-15 Bertin & Cie Apparatus for heat treating fragmented materials
US4214868A (en) * 1978-06-21 1980-07-29 Itoh Iron & Steel Works Co. Ltd. Method of and an apparatus for soaking steel pieces
US4859823A (en) * 1988-09-16 1989-08-22 Ajax Magnethermic Corporation Electric induction heater
US4886449A (en) * 1982-12-04 1989-12-12 General Motors Corporation Vacuum brazing of aluminum alloy workpieces
US5003892A (en) * 1989-06-09 1991-04-02 D.O.C.C., Inc. Process for sterile disposal of syringes
US5096675A (en) * 1989-12-05 1992-03-17 Samsung Electron Devices Co., Ltd. Apparatus for continuous calcining in noxious gas
US5173046A (en) * 1990-04-04 1992-12-22 Walker Stuart M Apparatus for treating the exterior surface of plastic containers
US6165936A (en) * 1997-07-25 2000-12-26 Noritake Co., Ltd. Method for producing alumina-based porous supports
US6227848B1 (en) * 1994-06-07 2001-05-08 Imai Seisakusho Co., Ltd. Vertical continuous oven
CN102032779A (zh) * 2011-01-17 2011-04-27 江阴长源机械制造有限公司 一种氮气氛保护推板窑的密封仓
US20170144842A1 (en) * 2015-11-20 2017-05-25 Greatquo Technology Co., Ltd. Automatically cycling detecting-and-sorting device

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1551827A (en) * 1921-12-14 1925-09-01 Us Cast Iron Pipe And Foundry Pipe-annealing furnace
US1970320A (en) * 1930-06-21 1934-08-14 Samuel M Kier Tunnel kiln
US2592236A (en) * 1950-07-15 1952-04-08 Selas Corp Of America Work conveying mechanism for furnaces
US2707629A (en) * 1954-03-25 1955-05-03 Frank J Kennedy Method and apparatus for heating metal parts
US2820367A (en) * 1956-01-23 1958-01-21 Charles E Frantz Device for conveying and rotating objects
US3038587A (en) * 1961-01-03 1962-06-12 Forano Ltd Log conveying apparatus
US3713555A (en) * 1971-01-22 1973-01-30 Custom Machine Inc Conveyor
US3778221A (en) * 1969-02-26 1973-12-11 Allegheny Ludlum Ind Inc Annealing furnace and method for its operation
US3779696A (en) * 1971-02-26 1973-12-18 Midwestern Specialties Ltd Pipe handling method and apparatus
US3812909A (en) * 1972-08-31 1974-05-28 J Zaichenko Apparatus for heating and cooling long cylindrical parts

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1551827A (en) * 1921-12-14 1925-09-01 Us Cast Iron Pipe And Foundry Pipe-annealing furnace
US1970320A (en) * 1930-06-21 1934-08-14 Samuel M Kier Tunnel kiln
US2592236A (en) * 1950-07-15 1952-04-08 Selas Corp Of America Work conveying mechanism for furnaces
US2707629A (en) * 1954-03-25 1955-05-03 Frank J Kennedy Method and apparatus for heating metal parts
US2820367A (en) * 1956-01-23 1958-01-21 Charles E Frantz Device for conveying and rotating objects
US3038587A (en) * 1961-01-03 1962-06-12 Forano Ltd Log conveying apparatus
US3778221A (en) * 1969-02-26 1973-12-11 Allegheny Ludlum Ind Inc Annealing furnace and method for its operation
US3713555A (en) * 1971-01-22 1973-01-30 Custom Machine Inc Conveyor
US3779696A (en) * 1971-02-26 1973-12-18 Midwestern Specialties Ltd Pipe handling method and apparatus
US3812909A (en) * 1972-08-31 1974-05-28 J Zaichenko Apparatus for heating and cooling long cylindrical parts

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982888A (en) * 1973-07-13 1976-09-28 Ceraver Heat treatment tunnel kiln for products having a circular cross-section
US4047886A (en) * 1975-11-24 1977-09-13 Commissariat A L'energie Atomique Furnace for the continuous sintering of pellets of ceramic nuclear fuel material
US4106894A (en) * 1975-12-19 1978-08-15 Bertin & Cie Apparatus for heat treating fragmented materials
US4214868A (en) * 1978-06-21 1980-07-29 Itoh Iron & Steel Works Co. Ltd. Method of and an apparatus for soaking steel pieces
US4311454A (en) * 1978-06-21 1982-01-19 Itoh Iron & Steel Works Co. Ltd. Method of soaking steel pieces
US4886449A (en) * 1982-12-04 1989-12-12 General Motors Corporation Vacuum brazing of aluminum alloy workpieces
US4859823A (en) * 1988-09-16 1989-08-22 Ajax Magnethermic Corporation Electric induction heater
US5003892A (en) * 1989-06-09 1991-04-02 D.O.C.C., Inc. Process for sterile disposal of syringes
US5096675A (en) * 1989-12-05 1992-03-17 Samsung Electron Devices Co., Ltd. Apparatus for continuous calcining in noxious gas
US5173046A (en) * 1990-04-04 1992-12-22 Walker Stuart M Apparatus for treating the exterior surface of plastic containers
US6227848B1 (en) * 1994-06-07 2001-05-08 Imai Seisakusho Co., Ltd. Vertical continuous oven
US6165936A (en) * 1997-07-25 2000-12-26 Noritake Co., Ltd. Method for producing alumina-based porous supports
CN102032779A (zh) * 2011-01-17 2011-04-27 江阴长源机械制造有限公司 一种氮气氛保护推板窑的密封仓
CN102032779B (zh) * 2011-01-17 2012-11-21 江阴长源机械制造有限公司 一种氮气氛保护推板窑的密封仓
US20170144842A1 (en) * 2015-11-20 2017-05-25 Greatquo Technology Co., Ltd. Automatically cycling detecting-and-sorting device
US9718625B2 (en) * 2015-11-20 2017-08-01 Greatquo Technology Co., Ltd. Automatically cycling detecting-and-sorting device

Also Published As

Publication number Publication date
FR2237535A5 (enrdf_load_stackoverflow) 1975-02-07
DE2433383A1 (de) 1975-01-30
GB1474786A (en) 1977-05-25

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