EP0194573B1 - Vorrichtung zum Einsetzen von Tieglen in Schmelzöfen - Google Patents

Vorrichtung zum Einsetzen von Tieglen in Schmelzöfen Download PDF

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Publication number
EP0194573B1
EP0194573B1 EP86102904A EP86102904A EP0194573B1 EP 0194573 B1 EP0194573 B1 EP 0194573B1 EP 86102904 A EP86102904 A EP 86102904A EP 86102904 A EP86102904 A EP 86102904A EP 0194573 B1 EP0194573 B1 EP 0194573B1
Authority
EP
European Patent Office
Prior art keywords
crucible
rod
anchor
lifting gear
casing
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
Application number
EP86102904A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0194573A1 (de
Inventor
Michael Herrmann
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.)
Dorentrup Feuerfest GmbH
Original Assignee
Dorentrup Feuerfest 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 Dorentrup Feuerfest GmbH filed Critical Dorentrup Feuerfest GmbH
Priority to AT86102904T priority Critical patent/ATE36406T1/de
Publication of EP0194573A1 publication Critical patent/EP0194573A1/de
Application granted granted Critical
Publication of EP0194573B1 publication Critical patent/EP0194573B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F27B14/10—Crucibles
    • 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F27B2014/0825—Crucible or pot support
    • F27B2014/0831—Support or means for the transport of crucibles
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D2001/1605—Repairing linings
    • 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

Definitions

  • the invention relates to a device for inserting crucibles in melting furnaces, with an armature reaching under the bottom of the crucible and a lifting device running coaxially through the crucible and an opening of the crucible bottom.
  • Such devices are used, for example, in foundries to insert the cup-shaped crucible made of refractory material from above into a melting furnace, for example an induction furnace.
  • an insertion device in which the armature is formed by a metal plate resting on the underside of the crucible bottom and the hoist has a rod engaging in an opening in the metal plate. After inserting the crucible into the furnace, the rod is released from the opening of the metal plate and the hoist is removed from the crucible while the metal plate remains under the crucible bottom. In this case, in some induction furnaces, the metal plate of the insertion device is exposed to the alternating field of the induction furnace, so that there is an undesirable heating of the metal plate.
  • insertion devices are known in which the hoist is provided with arms which can be tensioned radially against the inner surfaces of the crucible wall, so that the crucible is only held non-positively on the hoist.
  • the crucible which is made of relatively brittle material, will be damaged or destroyed if the arms are clamped too strongly against the crucible walls, or that the crucible will slide off the lifting device if the clamping force of the arms is too low.
  • the invention has for its object to provide a crucible inserting device which allows simple and secure fastening of the crucible with the aid of an armature which engages positively on the crucible bottom and in which the armature can be completely removed after the crucible has been inserted.
  • This object is achieved in that the armature is expandable in the radial direction.
  • the anchor arranged at the lower end of the lifting device is inserted from above through the opening of the crucible bottom and then spread radially so that it engages positively under the crucible bottom or in a recess formed at the lower end of the opening of the crucible bottom .
  • the armature is preferably formed by a number of support arms which are arranged in a star shape around a tensioning piece which absorbs the tensile force of the lifting device and is movable with respect to the supporting arms and are articulatedly attached to the lifting device with their upper ends.
  • the armature is spread out in that the support arms are pivoted outwards with the aid of the clamping piece.
  • the clamping piece is loosened again so that the armature can be pulled upwards through the opening of the crucible bottom with the support arms hanging freely downwards.
  • the clamping piece is designed as a pyramid which is connected to the hoist in an axially fixed manner or as a cone, and the support arms are fastened to a sleeve which is axially movable with respect to the hoist within a limited range.
  • the clamping piece moves upwards with respect to the support arms, so that the support arms are automatically spread.
  • the clamping piece is designed as a plate which is rotatable with respect to the support arms and which is provided with radially projecting cams for spreading the support arms.
  • a crucible 10 made of refractory material has a cylindrical wall 12 and a flat bottom 14. In the middle of the bottom 14 there is an opening 16 which is widened to a conical recess 18 on the underside of the bottom.
  • the hoist 20 has a tube 28 provided with an eyelet 26 at the upper end and a tube 30 inserted into the lower end of tube 28.
  • the lower tube 30 is provided with a number of transverse bores 32 and can be locked to the tube 28 at different heights by means of a bolt 34 running through a transverse bore at the lower end of the tube 28.
  • a rod 36 coaxial to the tubes 28, 30 is fixedly connected to the lower end of the tube 30.
  • the armature 24 comprises a coaxially arranged on the rod 36, box-shaped, downwardly open sleeve 42, on the lower edge of which four flap-shaped support arms 44 are articulated, and a pyramid-shaped clamping piece 46 which is fixedly connected to the lower end of the rod 36 and movable in the vertical direction.
  • the coaxial through the interior of the crucible 10 tube 28 of the hoist 22 is provided with telescopically extendable arms 48 which rest with their free ends on the inner surface of the wall 12 and are locked with the aid of set screws 50, so that the crucible 10 against one Tilting movement is secured in relation to the hoist.
  • the sleeve 42 of the armature 24 is in a low position, in which the support arms 44 are held in the spread position by the clamping piece 46, as shown in FIG. 1. If the hoist 22 is lifted with the aid of a crane which engages the eyelet 26, the support arms 44 lie flat with their free ends against the conical inner surface of the recess 18.
  • the dimensions of the clamping piece 46 and the sleeve 42 are chosen such that the Support arms 44 are clamped in the position shown in Figure 1 between the bottom 14 of the crucible and the clamping piece 46 so that the sleeve 42 can not move upwards.
  • the tensile force exerted on the hoist 22 is therefore transmitted to the base 14 of the crucible via the clamping piece 46 and the support arms 44. In this way, the crucible 10 can be safely raised, moved into a position above the melting furnace and lowered into the melting furnace.
  • the set screws 50 are loosened and the telescopic arms 48 are pushed inwards. Then the hoist 22 is lowered further, so that the clamping piece 46 releases the support arms 44. With the aid of the pull rope 52, the sleeve 42 is pulled upwards. As a result, the support arms 44 are pivoted inwards, so that the armature 24 can be pulled upward through the opening 16 of the crucible bottom when the hoist 22 is raised again.
  • the opening 16 of the crucible bottom is clogged with refractory material.
  • Figures 2 and 3 show a modified embodiment of the invention, which differs from the previously described embodiment with regard to the design of the clamping piece.
  • the clamping piece is formed by a plate 54 connected in a rotationally fixed manner to the rod 36 and provided with four cams 56 projecting radially.
  • the flank 58 leading in the case of a clockwise rotation is chamfered in a ramp shape.
  • the beveled flanks 58 merge via rounded corners 60, 62 into the outer edge 64 of the cam or into the steep flank 66 of the adjacent cam.
  • the plate 54 is provided with a central internally threaded bore 68, into which the lower end of the rod 36 is screwed.
  • plate 54 is secured against rotation with respect to rod 36.
  • the sleeve 42 provided with the support arms 44 is rotatable with respect to the rod 36.
  • the plate 54 is held in a position in which the support arms 44 lie in the spaces between the cams 56.
  • the hoist is lowered so far that the lower ends of the support arms 44 are supported on the floor surface on which the crucible 10 is placed.
  • the hoist is then rotated clockwise so that the support arms 44 slide onto the ramped bevelled flanks 58 of the cams 56 and are spread until the support arms 44 rest against the tangentially extending outer edges 64 of the cams 56
  • plate-shaped stops 70 are provided on the steep flanks 66 of the cams 56, which prevent the plate 54 from rotating further.
  • the plate 54 is rotated counterclockwise with the aid of the lifting device. A turning of the sleeve 42 is prevented in that the support arms 44 are supported on the bottom of the melting furnace.
  • the support arms 44 again lie in the spaces between the cams 56, so that the armature can be released from the bottom opening of the crucible.
  • FIG. 4 shows an expandable anchor 72 according to another embodiment of the invention.
  • a horizontal plate 74 is attached, on which a rubber element 76 in the form of a thick-walled annular tube is supported.
  • a plate 78 surrounding the rod 36 lies on the upper edge of the rubber element 76.
  • a sleeve 82, provided with radial arms 80, is pushed onto a section of the rod 36 above the plate 78 and is provided in the upper region with an internal thread, not shown, which engages with an external thread of the rod 36.
  • the sleeve 82 is rotated clockwise with the help of the arms 80 as seen from above.
  • the plate 78 is lowered into the position shown in broken lines in FIG. 4 with elastic deformation of the rubber element 76.
  • the compression of the rubber element 76 in the axial direction of the armature results in an expansion of the rubber element in the radial direction, so that the rubber element positively engages the conical wall of the recess 18 of the crucible bottom.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Saccharide Compounds (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Discharge Heating (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
EP86102904A 1985-03-07 1986-03-05 Vorrichtung zum Einsetzen von Tieglen in Schmelzöfen Expired EP0194573B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86102904T ATE36406T1 (de) 1985-03-07 1986-03-05 Vorrichtung zum einsetzen von tieglen in schmelzoefen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19858506543U DE8506543U1 (de) 1985-03-07 1985-03-07 Vorrichtung zum einsetzen von tiegeln in schmelzoefen
DE8506543U 1985-03-07

Publications (2)

Publication Number Publication Date
EP0194573A1 EP0194573A1 (de) 1986-09-17
EP0194573B1 true EP0194573B1 (de) 1988-08-10

Family

ID=6778287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102904A Expired EP0194573B1 (de) 1985-03-07 1986-03-05 Vorrichtung zum Einsetzen von Tieglen in Schmelzöfen

Country Status (5)

Country Link
EP (1) EP0194573B1 (fi)
AT (1) ATE36406T1 (fi)
DE (2) DE8506543U1 (fi)
ES (1) ES8706253A1 (fi)
FI (1) FI81906C (fi)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5280495A (en) * 1992-02-14 1994-01-18 Ajax Magnethermic Corporation Furnace refractory extraction system and method
CN113071982B (zh) * 2021-04-26 2022-10-18 曲靖晶龙电子材料有限公司 一种坩埚吊运工装

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8335877U1 (de) * 1984-03-08 Prokon Feuerfest GmbH, 4815 Schloß Holte-Stukenbrock Hebezeuganordnung an einem vorgefertigten Schmelztiegel
BE335866A (fi) *
GB975469A (en) * 1962-08-17 1964-11-18 Taylor & Sons Ltd Improvements relating to lifting devices
DE2919705C2 (de) * 1979-05-16 1982-12-23 Brown, Boveri & Cie Ag, 6800 Mannheim Tiegelofen mit einem aus einer Stampfmasse hergestellten und im Ofen gesinterten Tiegel

Also Published As

Publication number Publication date
ES8706253A1 (es) 1987-06-01
FI860949A0 (fi) 1986-03-06
FI860949A (fi) 1986-09-08
ATE36406T1 (de) 1988-08-15
FI81906C (fi) 1990-12-10
ES552720A0 (es) 1987-06-01
EP0194573A1 (de) 1986-09-17
FI81906B (fi) 1990-08-31
DE8506543U1 (de) 1985-05-30
DE3660520D1 (en) 1988-09-15

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