EP1425545B1 - Apparatus for tapping molten metal - Google Patents
Apparatus for tapping molten metal Download PDFInfo
- Publication number
- EP1425545B1 EP1425545B1 EP02747784A EP02747784A EP1425545B1 EP 1425545 B1 EP1425545 B1 EP 1425545B1 EP 02747784 A EP02747784 A EP 02747784A EP 02747784 A EP02747784 A EP 02747784A EP 1425545 B1 EP1425545 B1 EP 1425545B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- crucible
- tapping
- support structure
- tube
- transporting device
- 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
Links
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 99
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 13
- 239000002184 metal Substances 0.000 title claims abstract description 13
- 239000000725 suspension Substances 0.000 claims abstract description 11
- 239000004411 aluminium Substances 0.000 claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims 1
- 239000002893 slag Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/06—Charging or discharging machines on travelling carriages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/12—Travelling ladles or similar containers; Cars for ladles
-
- 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
- F27D3/14—Charging or discharging liquid or molten material
-
- 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
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
- F27B3/19—Arrangements of devices for discharging
-
- 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
- F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
- F27D2003/0054—Means to move molten metal, e.g. electromagnetic pump
Definitions
- the invention relates to tapping of molten metal from aluminium electrolytic furnaces.
- Factories for producing aluminium comprise a large number of electrolytic furnaces or cells placed side by side in the furnace houses.
- the spacing between the cells is at a minimum in order to save space.
- the tapping is brought about by drawing the molten metal from the electrolytic cells via a tapping tube up into a tapping crucible that is successively brought to a tapping position in between the furnaces by means of a transporting device which, upon completed tapping operation, carries the crucible to a foundry or other location as required for discharging the molten metal from the crucible.
- the transporting device could be a crane, truck or the like, but currently specially designed tapping carriages are normally used, such as described in NO 132 774 and WO 8604839.
- the tapping crucible which normally has a circular-cylindrical cross section, is supported in the transporting device with its longitudinal axis vertical.
- the upper end wall of the crucible is in the form of a cover which can be removed from the underlying part of the crucible, permitting the latter to be lifted from the carriage. e.g. for raking out slag which is normally removed from the wall of the crucible by means of a special milling tool.
- tapping capacity as used herein is meant attainable volume of molten metal in the crucible, also called effective tapping volume.
- effective tapping volume attainable volume of molten metal in the crucible
- the possibility of expanding the capacity in such works is very limited. Owing to the narrow spacing between the electrolytic cells the width of the crucible, for example, and thus the diameter of the tapping crucible, is a limiting factor. In practice, therefore, the outer diameter of the crucible should not exceed 2 meter.
- Another limiting factor is the height of the metal column in the crucible.
- the metal is drawn into the crucible by means of a vacuum at a pressure of about 0.3 bar absolute, giving a maximum static suction head of about 3 meter.
- the crucible capacity of conventional tapping carriage/crucible structures of the above type can hardly be increased beyond about 3m 3 .
- the crucible diameter and crucible height has to be adapted to each individual work, requiring corresponding changes in the design of crucible, crucible cover, crucible support and the tapping carriage itself.
- the present invention solves the above capacity problem in a new and surprisingly simple way, namely by adapting the cylindrical tapping crucible with accessories in a manner permitting the crucible to be supported in the transporting device with the longitudinal axis of the crucible extending horizontally, such as stated in the appending patent claims in which the apparatus according to the invention is defined.
- the length of the tapping carriage is not a critical dimension like height and width. Consequently, based on the inventive principle, the length of the crucible and thus its effective tapping volume, can be extended beyond that which is practically feasible with conventional tapping carriages. It is a realistic possibility to double the maximum crucible capacity by using the solution according to the present invention.
- the respective tapping carriages can easily be adapted to these demands, by scaling the lengths of the carriage and crucible correspondingly, without the necessity of special adaption of the remaining parts of the tapping carriage.
- the crucible is divided radially in two parts that are releasably interconnected by means of a sealed flange connection, permitting the crucible, in disassembled condition with separated crucible parts, to be freed from slag with essentially the same tool that is used for conventional crucibles.
- the support structure in which the crucible is horizontally supported permits the crucible to be displaced, together with the tapping tube, along a ramp, parallelly with the longitudinal axis of the tapping tube, while preferably also being capable of horizontal displacement. This permits rapid positioning of the tapping carriage and tapping tube into tapping position relative to the furnace more easily and snugly than permitted when using conventional technique.
- the invention is intended to be used primarily in connection with a transporting device in the form of a specially constructed tapping carriage of substantially the same type as that disclosed in the above NO 132 744 and WO 8604839, and it will therefore be described in such connection. It should be appreciated, however, that the invention is also relevant in connection with other transporting devices, as more fully explained below.
- the tapping carriage shown in figure 1 is in the form of an automotive vehicle generally comprising a main frame 2 with front wheels 4, rear wheels 6, driver cab 8, and a tapping crucible or ladle 10 having a substantially circular cross-section. supported in a support structure 12 which is rigidly connected to the main frame 2, between the front and rear wheels of the carriage. Pivotably supported on the carriage is also a tapping tube 14 adapted to be connected to a substantially bell-shaped tapping head 16.
- the tapping and discharge operations are carried out in a well-known manner by means of under-pressure (vacuum) and over-pressure in crucible 10. Means for operating the tapping and discharge operations will normally be located in the driver cab together with operating means for controlling the movements of the tapping carriage. So far, the tapping carriage is generally in accordance with conventional tapping carriages of the introductorily mentioned type.
- FIG. 2 A favourable embodiment of a crucible 10 intended for being horizontally supported in accordance with the inventive principle, is shown in figures 2 and 3, the former figure also including an encircled detail.
- the crucible 10 consists of an elongate, substantially circular-cylindrical sidewall 22 having two preferably substantially flat end walls 24.
- the crucible 10 is divided into two parts 10a, 10b, along a radial plane through sidewall 22, in which the two crucible parts 10a, 10b are sealingly interconnected, preferably by means of a bolted flange connection 26, 28, provided with seals 30, 32 which, upon tightening of the flange bolts 36, are tightly compressed between the flange parts 26, 28 and opposing surfaces of the refractory lining 34 of the crucible.
- the seals 30, 32 could generally be of the standard heat-resistant type as used in conventional casting structures.
- the flange is made sufficiently massive and rigid to permit a few (6 - 8) strong bolts 36 to hold the crucible parts together.
- One of the crucible parts, preferably the foremost one (with reference to the tapping vehicle) 10a has a tapping opening or hatch 38 near the top of the cylinder wall 22, adapted to cooperate with the tapping head 16, as detailed below.
- An additional opening 40 is formed near the end wall of crucible part 10a, for mounting a socket 18 (fig. 1) communicating with a discharge tube (not shown) internally of the crucible.
- the required maximum crucible capacity can be achieved by providing the horizontally disposed crucible with an effective length enabling the designer to satisfy even very high capacity requirements, in spite of the previously discussed limitations on crucible diameter.
- This standard length could be about half the length of a crucible in the upper area of the capacity range, for example, to give a crucible having two crucible halves 10a, 10b of substantially equal lengths.
- the rear crucible part 10b is shown with a shorter length than the front crucible part 10a, which means that this crucible part is intended for a crucible belonging to the lower area of the capacity range.
- each of its end walls 24 is provided with a pair of protruding, downward-directed journals 44 adapted to be received in corresponding journal seats 46 (figure 5) in the crucible 10 support structure.
- the end walls 24 are formed with bracing ribs 48 distributing the supporting forces across the end walls.
- the journals 44 are positioned at the upper part of the end walls, equally horizontally and vertically spaced, as shown in figure 3.
- FIG 4 An advantageous embodiment of the crucible support structure 12 is shown in figure 4.
- the seats 46 for the journals 44 in each end of the crucible 10 are disposed in respective suspension members 50 spaced in accordance with the spacing between the journal pairs in the crucible end walls 24 and resting horizontally displaceable, via wheels 52, on respective support members 54 which, in their turn, are slidingly supported in a respective one of two parallel guides 58 which, at their top and bottom ends, are secured to the main frame 2 of the tapping carriage.
- Horizontal movement of the suspension members 50 is accomplished by respective actuating rams 59, while movement of the support members 54 along the guides 58 is accomplished by means of respective actuating rams 61 (figure 6).
- Load sensing means such as weighing cells 60, can conveniently be provided in connection with the crucible suspension, for easy determination of tapped molten metal weight.
- the crucible tapping opening 38 is adapted to cooperate with a tapping head 16.
- the tapping head 16 has a somewhat elongate shape adapted to the shape of the tapping opening 38 and is, near one end portion thereof, at 61 connected to a superjacent bridge 62 extending horizontally longitudinally of the crucible 10 and, near each end thereof, connected to the upper end of a swivel arm 64 which, at its lower end, is pivotably connected to the upper end of the suspension member 50 of the support structure 12.
- the bridge 62 is also, at each outer end thereof, connected to the piston rod of an actuating ram 66 which, at its lower end, is rotatably supported in a respective one of the support members 50.
- the bridge 62 with tapping head 16 can be swung from a tapping position in which the rim of the tapping head is urged into tight engagement with the rim of the tapping opening 38, to a raised position as indicated with thin contour lines in fig. 5, in which the crucible 10 is free to be disassembled for replacement, e.g. in connection with slag removal.
- the tapping tube 14 is adapted to swing out, as indicated with arrows B in fig. 4, from its position as shown in figure 1 where it is resting on the crucible 10 parallel to its longitudinal axis, into a downwardly and outwardly inclined position laterally of the carriage as shown in figure 6, substantially in the same manner as the tapping tube of the tapping carriage according to the previously mentioned NO 132 774.
- the tapping tube 14 is joumalled, via a cradle 70, on a tilted pivot 68 on a bracket 69 secured to the tapping head.
- Bracket 69 also carries a tilted actuating ram 71 (indicated in fig. 4 merely by its centre line) for pivoting the tapping tube.
- Tapping head 16 in its end wall 68 opposite its end connection 61 to bridge 62, has an opening surrounded by an annular seat tightly cooperating with a correspondingly shaped end portion of the tapping tube 14 when the latter has been swung down to its tapping position.
- the tapping carriage according to the invention is shown in a position beside an electrolytic cell 80, with its tapping tube 14 swung out into tapping position.
- the crucible 10 for easy and quick positioning of the tapping tube 14 relative to the electrolytic furnace, can be manoeuvred horizontally as indicated with arrows C, between two extreme positions by horizontal displacement of the suspension members 50 on the support members 54 transversally of the carriage, while the support members can slide up and down along the inclined guides parallel to the longitudinal axis of the tapping tube, as indicated by arrows C.
- the crucible 10 with accessories is shown in its upper, "rear" (i.e.
- the crucible When the crucible is to be removed from its support structure in the transporting device, it can easily be released from the tapping head and tapping tube by swinging the tapping tube and head up from their position in connection with the crucible tapping opening 38 by way of the support structure bridge 62 and rams 66, whereupon the crucible can be lifted free of the support structure.
- FIGS 7 - 8 illustrate a modified support structure 112 intended for use in connection with a crane as transporting device.
- Support structure 112 is in the form of a yoke with support arms 154 connected to a hook-shaped lower suspension portion 150 provided with seats 146 for journals 44 of the crucible 10.
- the yoke 112 is connected via a telescopic length-adjustable connection 113 and turnrim 115 to a subjacent transporting device indicated by line 117, such as the carriage of a travelling crane. If desireable, however, yoke 112 can easily be adapted for suspension in a crane hook or the like.
- support structure or yoke 112 is provided with a tapping head 16 connected to bridge 62, swivel arm 64 and rams 66 connected to yoke suspension portion 150.
- support structure 112 is not provided with means, such as guides 58 in support structure 12, for positioning the tapping tube in the melting furnace, because the required positioning movements are accomplished by the crane and possibly the telescopic connection.
Abstract
Description
Claims (3)
- Apparatus for use in tapping molten aluminium metal successively from a series of electrolytic cells of an aluminium production plant, said apparatus comprising a crucible (10) having a substantially circular-cylindrical side wall (22) divided along a radial plane into two separably interconnected parts (10a, 10b), a tapping opening (38) in the cylindrical side wall (22) and an end wall (24) connected at each end of the side wall; a tapping tube (14) adapted to be moved into an inclined position in which it communicates with the molten metal of an electrolytic cell (80) at one end and with crucible interior at the other end via a tapping head (16); and a support structure associated with a transporting device and comprising a pair of suspending members (50; 150) spaced outside each end wall (24) of the crucible (10) and provided with seat means (46; 146) mating with respective journal means (44) provided at each crucible end walls, permitting the crucible (10) to be supported in the transporting device with its longitudinal axis (20) substantially horizontal; the tapping tube (14) and tapping head (16) being connected to a bridge member (62) extending horizontally longitudinally above the crucible and swingably connected to the suspending members (50; 150) to permit displacement of the tapping head (16) between a raised position above the crucible tapping opening (38) and a lowered position in which the tapping head (14) seats on the tapping opening.
- Apparatus according to claim 1, wherein the support structure further comprises a pair of parallel, spaced guides (58) adapted to be mounted in the transport device along a ramp having an angle substantially equal to that of the tapping tube (14) during a tapping operation, and a pair of spaced support members (54) movably accommodated in said pair of spaced guides while supporting said suspension members (50) movably thereon.
- Apparatus according to claim 1, wherein the support structure further comprises a yoke (112) with support arms (154) connected to the suspension members (150).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20013908A NO312501B1 (en) | 2001-08-10 | 2001-08-10 | Method and crucible for use in tapping molten metal from aluminum electrolysis furnaces and the like, as well as drill construction for storing the crucible |
NO20013908 | 2001-08-10 | ||
PCT/NO2002/000269 WO2003014646A1 (en) | 2001-08-10 | 2002-07-22 | Method, apparatus and carriage for tapping of molten metal |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1425545A1 EP1425545A1 (en) | 2004-06-09 |
EP1425545B1 true EP1425545B1 (en) | 2005-05-18 |
Family
ID=19912726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02747784A Expired - Lifetime EP1425545B1 (en) | 2001-08-10 | 2002-07-22 | Apparatus for tapping molten metal |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1425545B1 (en) |
CN (1) | CN100400998C (en) |
AT (1) | ATE295954T1 (en) |
DE (1) | DE60204228T2 (en) |
NO (1) | NO312501B1 (en) |
WO (1) | WO2003014646A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2937341B1 (en) | 2008-10-16 | 2010-11-12 | Ecl | SERVICE MACHINE FOR INTERVENTION ON ELECTROLYSIS CELLS FOR THE PRODUCTION OF ALUMINUM BY IGNEE ELECTROLYSIS |
CN104792175B (en) * | 2015-04-21 | 2016-11-30 | 永兴县东宸有色金属再生利用有限公司 | Vacuum drying oven silver collection device |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1583473A1 (en) * | 1967-10-09 | 1970-08-13 | Hugo Moewius | Furnace system for melting basalt and similar minerals |
NO132774C (en) * | 1973-12-10 | 1975-12-29 | Ardal Og Sunndal Verk | |
DE2555198C2 (en) * | 1975-12-09 | 1978-09-28 | Gutehoffnungshuette Sterkrade Ag, 4200 Oberhausen | Mixer trolleys for the transport of molten metals |
DE3001107C2 (en) * | 1979-01-19 | 1983-12-01 | Davy International (Minerals & Metals) Ltd., Stockton-on-Tees, Cleveland | Mobile device for collecting molten metal |
US4381855A (en) * | 1981-05-06 | 1983-05-03 | Industrial Machine Works, Inc. | Technique for conserving hot metal temperature |
US4367865A (en) * | 1981-09-21 | 1983-01-11 | Republic Steel Corporation | Method and apparatus for emptying bottle cars |
IT1183397B (en) * | 1985-02-21 | 1987-10-22 | Techmo Car Spa | MOTOR VEHICLE FOR THE COMPLETE HANDLING OF LADDERS AND SIMILARS, IN PARTICULAR OF THOSE USED FOR THE COLLECTION OF ALUMINUM AND METAL ALLOYS IN GENERAL |
JPS62127416A (en) * | 1985-11-27 | 1987-06-09 | Kawatetsu Tekko Kogyo Kk | Method and apparatus for raking out slag lump in torpedo car |
US5058654A (en) * | 1990-07-06 | 1991-10-22 | Outboard Marine Corporation | Methods and apparatus for transporting portable furnaces |
NO934388D0 (en) * | 1993-09-21 | 1993-12-02 | Mo Industritransport As | Process and Tea Box for Use in the Transport of Melters, Particularly Metal Melters, in the Melting Industry |
US5544867A (en) * | 1995-03-13 | 1996-08-13 | Neyer; Richard H. | Apparatus and process for transporting molten metal |
-
2001
- 2001-08-10 NO NO20013908A patent/NO312501B1/en not_active IP Right Cessation
-
2002
- 2002-07-22 WO PCT/NO2002/000269 patent/WO2003014646A1/en not_active Application Discontinuation
- 2002-07-22 CN CNB028157362A patent/CN100400998C/en not_active Expired - Fee Related
- 2002-07-22 AT AT02747784T patent/ATE295954T1/en not_active IP Right Cessation
- 2002-07-22 EP EP02747784A patent/EP1425545B1/en not_active Expired - Lifetime
- 2002-07-22 DE DE60204228T patent/DE60204228T2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ATE295954T1 (en) | 2005-06-15 |
DE60204228D1 (en) | 2005-06-23 |
NO20013908D0 (en) | 2001-08-10 |
WO2003014646A1 (en) | 2003-02-20 |
EP1425545A1 (en) | 2004-06-09 |
CN100400998C (en) | 2008-07-09 |
CN1541325A (en) | 2004-10-27 |
NO20013908A (en) | 2002-05-21 |
DE60204228T2 (en) | 2006-01-26 |
NO312501B1 (en) | 2002-05-21 |
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