EP0445087B1 - Box nozzle for ladles and the like, with lateral pressure springs - Google Patents
Box nozzle for ladles and the like, with lateral pressure springs Download PDFInfo
- Publication number
- EP0445087B1 EP0445087B1 EP91830071A EP91830071A EP0445087B1 EP 0445087 B1 EP0445087 B1 EP 0445087B1 EP 91830071 A EP91830071 A EP 91830071A EP 91830071 A EP91830071 A EP 91830071A EP 0445087 B1 EP0445087 B1 EP 0445087B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- cover
- slide
- refractory
- fixed
- 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
- 239000002184 metal Substances 0.000 claims abstract description 41
- 230000000712 assembly Effects 0.000 claims abstract description 13
- 238000000429 assembly Methods 0.000 claims abstract description 13
- 238000012423 maintenance Methods 0.000 claims abstract description 4
- 230000008878 coupling Effects 0.000 claims description 14
- 238000010168 coupling process Methods 0.000 claims description 14
- 238000005859 coupling reaction Methods 0.000 claims description 14
- 239000011819 refractory material Substances 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 240000004050 Pentaglottis sempervirens Species 0.000 description 4
- 235000004522 Pentaglottis sempervirens Nutrition 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000005253 cladding Methods 0.000 description 3
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- 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
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
- B22D41/40—Means for pressing the plates together
Definitions
- the object of the present invention is a box nozzle with lateral pressure springs, for ladles.
- Box nozzles have been used for several years for discharging ladle, tundishes and the like, stagewise, if desired.
- Box nozzles consist basically of a pair of refractory plates, one fixed, the other movable, each with an orifice: relative movement of these two plates permits regulation of the size of the opening through which the liquid steel leaves the ladle.
- Said pair of refractory plates is associated with a first refractory coupling positioned beneath the sliding plate and moving with it, and a second refractory coupling, positioned above the fixed refractory plate, inserted in the thickness of the refractory lining of the ladle, plus a third refractory coupling that surrounds it.
- a support and movement device which generally includes:
- the aforesaid metal plates have a large central opening, of course.
- the two refractory plates with orifices are suitably anchored, the fixed one to the lower face of the fixed upper metal plate, and the moving one to the upper face of the slide.
- French Patent Publication 2,247,302 refers to a box nozzle comprising a first fixed refractory plate, provided with a through orifice, and a second movable refractory plate, also with a through orifice, inserted in a metallic slide pivoting around a pin, to permit opening and closing of a passage, consisting in the through orifices, for liquid metal.
- the slide rests on springs, to urge said movable refractory plate against said fixed refractory plate; the pin, however, allows the slide, and hence the moving refractory plate, to move only about the axis of the pin itself.
- said means of connection must be such as to ensure precise, rapid and safe control by the operators.
- US Patent 4,660,749 utilizes a slide resting on a set of fully preloaded springs.
- a bracket is rotated around a hinged joint to bring said refractory plates into mutual contact, and then a nut, opposed to said hinged joint, is tightened.
- the fixed and movable refractory plates contact each other only at the edges thereof closest to the hinged joint; the forces created by tightening of said nut are concentrated at said edges, thereby causing cracking or otherwise damaging thereof.
- box nozzle As the size of box nozzle increases, it becomes more and more difficult to achieve the above conditions simply and safely, guaranteeing good reliability.
- an intermediate frame which tilts on two perpendicular axes lying in the plane of movement of the slide, is inserted between the slide and the cover. Inclination of said tilting frame is achieved by means of two rows of springs supported by the cover and parallel to the long sides thereof.
- the long sides of the intermediate tilting frame rest on the two rows of springs.
- the slide on which is mounted the sliding refractory plate runs in guides on top of the tilting frame.
- the tilting frame can always keep the two counterposed faces of the fixed and movable refractory plates in perfect contact with one another.
- the means of connection between the cover and the fixed upper refractory plate consist of bolts that are hinged at one end. Said bolts are tightened until the faces of said cover and said fixed upper metal plate are completely flush: hence the bolt-tightening operations call for no particular control by means of torque spanners, for example. However, the tightening operation is done last.
- spring assemblies which protrude from the upper face of said cover, are inserted on the bottom of the cover through threaded holes.
- the tilting frame is rested on the protuding ends of the spring assemblies and the moving slide is rested on top of this.
- Two pairs of counterposed guide strips are placed between the tilting frame and slide.
- the edges of the slide are then pushed towards the cover by means of a pair of counter-strips that are fixed to the cover by screws. Tightening the screws results in an initial compression of the spring assemblies, urging the ensamble of tilting frame, slide and related refractory plate and nozzle against protruding strips of the cover; the ensamble is thus firmly kept in position, to prevent movable parts such as the slide from accidentally falling, and to avoid an excessive initial pressure between the refractory plates.
- the cover which is now equipped with springs, tilting frame and slide, is turned over against the fixed upper metal plate and is pressed against it by fully tightening the hinged bolts which connect the cover to the fixed upper plate.
- the spring assemblies receive a second and definitive compression which ensures that the counterposed faces of the fixed and movable refractory plates are urged elastically against one another.
- Such definitive compression causes the slide to be detached from said protruding strips, thus permitting the tilting frame to find its proper position and the fixed and movable refractory plates to be in perfect contact.
- 10 indicates the fixed upper metal plate that is attached to the bottom of the ladle. Drilled hinge-pieces 11 and 12 are fixed to the longitudinal side of said plate. Hinged to these via pins are bolts 13 and catches 14.
- Said fixed lower plate known as the cover, is actually formed of a robust quadrangular frame with variously-shaped internal longitudinal flanges 21 in each of which are two large threaded holes 22, and external longitudinal flanges 23.
- the external flanges have notches 24 and 25 to permit the passage of bolts 13 and catches 14.
- Spring assemblies 40 are inserted in holes 22.
- the assemblies protrude from the upper face of cover 20 and provide elastic support for tilting frame 50 complete with seats 51 for the upper ends of the spring assemblies.
- Tilting frame 50 is complete with a large central opening 52 (see Figs. 5 and 12) which is roughly rectangular in shape.
- Fixed refractory plate 30 is mounted against the lower face 16 of the fixed upper plate.
- Fixed upper refractory coupling 31 rests against said fixed refractory plate.
- a small plate 80 which is attached to the upper face of a heat shield 81, connected to a ferrule 82 which surrounds and protects refractory coupling 71 that is attached to sliding plate 70.
- guide strips 62 fixed to the long sides of slide 60, destined to run on guide strips 53 attached to tilting frame 50.
- a third pair of strips 63 is fixed to the upper face of the long sides of cover 20 and, together with guide strips 53, ensures heightwise restriction of the movement of slide 60 which is moved by connecting shaft 83.
- the third fixed refractory coupling 32 which surrounds coupling 31 and rests against the upper surface of levelling plate 33, is visible in Fig.2.
- Coupling 32 is surrounded by the inner refractory lining 35 of the ladle.
- Fig.2 also illustrates the metal cladding 36 of fixed plate 30, as well as the metal claddings 72 and 73 of sliding refractory plate 70 and sliding coupling 71.
- catch 14 does not support flange 23 when nuts 15 are tightened, since its function is to indicate to the operator that nuts 15 have been completely tightened: if this is not the case it is not possible to tilt the catch to the position illustrated in Fig.2.
- Catch 14 also provide a guarantee against accidental opening of bolts 13.
- Fig.3 shows magnets 18 inserted in corresponding cavities of catches 14 and which act on the sides of cover 20 preventing the catches from turning outwards. It also illustrates the way spring assembly 40 supports tilting frame 50 on which slide 60 moves along guide strips 53 and 62.
- Fig.4 illustrates in greater detail the Belleville washers 41 of assembly 40: the springs are inserted on flanged bush 42 which, in turn, is inserted on pin 43 that has a retaining ring 44 at one end while the other is screwed to a cap 45 whose outer cylindrical surface is threaded and screwed in ring 46 that is also threaded externally.
- ring 46 is solely to create a wear thread on cover 20 and so, from the functional aspect, it can be considered to form an integral part of cover 20 in whose threaded holes 22 it is screwed by means of its external thread.
- Spring assembly 41 formed of parts 41, 42, 43, 44 and 45, is screwed in hole 22, already equipped with ring 46, until it comes up against the outer flange of cap 45.
- the spring assembly 40 can be fitted up with cover 20 in the open position illustrated in Fig.1 and, after this has been done, flanged bushes 42 rest against retaining rings 44 protruding from the inner face of cover 20.
- tilting frame 50 In a second stage tilting frame 50 is rested against the ends 42 of spring assemblies 40. Subsequently slide 60 is rested on the frame.
- clearance 120 (Fig.4) is nil owing to the thrust of the springs.
- Fig.4 also clearly illustrates conduit 47 which carries cold air to springs 41 via minor passages 48.
- Figs 6, 7 and 8 show the structural details of fixed upper metal plate 10 with recess 111 on its upper surface to receive the base of the third fixed refractory coupling 32, inserted into the ladle, as visible in Figs 3 and 4.
- the entire fixed upper metal plate 10 is pierced by a circular hole 112 which - as can be seen from Figs 2 and 3 - serves for the passage of the lower end of fixed refractory coupling 31 which can be extracted from below, from the outside of the ladle.
- the lower face of fixed upper metal plate 10 also has elongated recess 113 for housing fixed upper refractory plate 30.
- grooves 114 On the bottom of recess 112 are grooves 114 to facilitate correct positioning of fixed upper refractory plate 30 which, as already mentioned, is metal clad on the top and the sides. The same metal cladding is also utilized to retain refractory plate 30 in recess 113 by means of cylindrical magnets housed in blind holes 118.
- Holes 117 in fixed upper metal plate 10 serve to fix it to ladle-bottom levelling plate 33 via screws.
- sliding refractory plate 70 which, as already mentioned, is metal clad on the lower face and sides so as to permit the use of cylindrical magnets housed in circular holes 163 on the bottom of recess 162.
- One end of slide 60 has threaded holes 164 for connecting to control shaft 83.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
- Springs (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
Description
- a metal levelling plate positioned beneath the bottom of the ladle and equipped with an appropriate opening for inserting and extracting the second fixed refractory coupling;
- a fixed upper metal plate, suitably connected by bolts to the bottom of the ladle to which said levelling plate belongs;
- a fixed lower metal plate, referred to as "the cover" for short, which must be detachable to permit maintenance of the mechanism and refractory parts of the box nozzle; said cover or fixed lower metal plate is generally connected to the fixed upper metal plate by means of hinged bolts;
- a sliding metal frame referred to henceforth as "the slide" for short, which runs between the fixed upper metal plate and the fixed lower metal plate or cover;
- guides positioned between the fixed lower metal plate, or cover, and the sliding metal frame, or slide.
- Fig.1 is an exploded view of the component parts of the box nozzle as per the invention;
- Fig.2 is a longitudinal view of the box nozzle, half sectionalized, with the nozzle in the open position, namely with the orifices of the fixed and movable plates lined up; the term "longitudinal" used in this context means the direction parallel to the direction of movement of the sliding refractory plate;
- Fig.3 is a half cross-section of the box nozzle;
- Fig.4 illustrates a detail of the preceding figure at larger scale;
- Fig.5 (right half) illustrates a section on the V-V plane of Fig.3, while Fig.5 (left half) illustrates a section on the VA-VA plane of Fig.3: the V-V plane coincides with the plane on which lies the lower face of the levelling plate; plane VA-VA coincides with the separation and contact plane of the fixed and movable refractory plates;
- Fig.6 (upper half) provides a bird's-eye view of the fixed upper plate, while Fig.6 (lower half) provides a worm's-eye view thereof;
- Fig.7 is a cross-section through the fixed upper plate along VII-VII of Fig.6;
- Fig.8 is a longitudinal section of the same plate along VIII-VIII of Fig.6;
- Fig.9 (upper half) provides a worm's-eye view of the fixed lower plate, namely the cover, while Fig.9 (lower half) provides a bird's-eye view thereof;
- Fig.10 is a cross-section of the cover along X-X of Fig.9;
- Fig.11 is a longitudinal section of the cover along XI-XI of Fig.9;
- Fig.12 (upper half) provides a bird's-eye view of the tilting frame, while Fig.9 (lower half) provides a worm's-eye view thereof;
- Fig.13 is a cross-section of the tilting frame along XIII-XIII of Fig.12;
- Fig.14 is a longitudinal section of the tilting frame along XIV-XIV of Fig.12;
- Fig.15 (upper half) provides a bird's-eye view of the slide, while Fig.15 (lower half) provides a worm's-eye view thereof;
- Fig.16 is a cross-section of the slide along XVI-XVI of Fig.15;
- Fig.17 is a longitudinal section along XVII-XVII of Fig.15.
Claims (6)
- Box nozzle for ladles and the like, of the type including (i) a fixed upper metal plate (10) attached to the bottom of the ladle and bearing hinged
(ii) a lower metal plate (20), referred to as the cover, which can be pivoted between an open position, at about right angle from the upper plate (10), and a closed position, parallel and close to the upper plate (10), and maintained in the closed position by bolts (13) and nuts (15) and releasable from the upper plate (10) for maintenance of the box nozzle;
(iii) a third metal plate (60), referred to as the slide, placed between the upper plate (10) and the cover (20) and sliding within the latter, driven by driving means (83);
(iv) a first refractory plate (30) having a through orifice and being held in a fixed position within the upper plate (10);
(v) a second refractory plate (70) having a through orifice and being held in a fixed position within said slide (60) and sliding with the latter within the cover (20);
said second refractory plate (70) being put in contact with the first refractory plate (30) when the cover (20) is held against the upper plate (10) in the closed position, so that in such closed position the slide (60) is slidingly suspended on a set of spring assemblies (40) and is free to move, urged by each of said springs, to cope with any misalignment between the refractory plates (30) and (70), the only connection between the slide (60) and the upper fixed plate (10) being through sliding contact between the refractory plate (70), inserted in the slide (60), and the refractory plate (30) inserted in upper fixed plate (10), characterized in that guide strips (63) are fixed to the upper face of the long sides of the cover (20) and protrude therefrom towards the slide (60), said strips (63) being in contact and cooperating with the edges of the slide (60) and with the spring assemblies (40) screwed to the lower face of the cover (20) to keep the slide (60), the tilting frame (50) and the refractory parts (70, 71) in place when the box nozzle is opened about the hinges (11, 12), and detaching from said edges only when the nuts (15) are tightened, thus creating a clearance (120) and permitting free movement of the slide (60) and of the tilting frame (50). - Box nozzle according to claim 1, characterized in that pairs of guide strips (53, 62) are connected to counterposed long sides of the slide (60) and of the tilting frame (50).
- Box nozzle according to any one of the preceding claims, characterized in that said springs assemblies (40) consist each of an assembly of Belleville washers (41) inserted on a pin (43) between a flanged bush (42) and a threaded cap (45); wherein each of said threaded cap (45) is screwed into a treaded hole (22) of the cover (20), a number of said threaded holes (22) being aligned along long sides of the tilting frame (50) on which rest each of said flanged bushes (42).
- Box nozzle according to any one of the above claims, characterized in that on the long sides of said cover (20) there are conduits (47) conveying pressurized air to cool said spring assemblies (40).
- Box nozzle according to any one of above claims, characterized in that upper face of the fixed refractory plate (30) and lower face of the refractory plate (70) as well as lateral sides of both plates are all metal clad, and in that a coupling (71), also in refractory material, placed beneath said sliding refractory plate (70), is also metal clad and moreover protected by a ferule (82) providing support for a heat shield (81).
- Box nozzle according to any one of the above claims, characterized in that the cover (20) is safely held in its fully closed position by a swivelling catch (14) maintained in contact with cover (20) by magnets (18), the insertion of said catch (14) into a slot (25) indicating the correct tightening of nuts (15) on bolts (13).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT12435A IT1240587B (en) | 1990-03-02 | 1990-03-02 | DRAIN DISCHARGE FOR LADIES AND SIMILAR, WITH SIDE PRESSURE SPRINGS |
IT1243590 | 1990-03-02 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0445087A2 EP0445087A2 (en) | 1991-09-04 |
EP0445087A3 EP0445087A3 (en) | 1992-04-29 |
EP0445087B1 true EP0445087B1 (en) | 1998-06-03 |
Family
ID=11140132
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91830071A Expired - Lifetime EP0445087B1 (en) | 1990-03-02 | 1991-03-04 | Box nozzle for ladles and the like, with lateral pressure springs |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0445087B1 (en) |
AT (1) | ATE166815T1 (en) |
DE (2) | DE69129504T2 (en) |
ES (1) | ES2031795T3 (en) |
IT (1) | IT1240587B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69227770D1 (en) * | 1992-09-28 | 1999-01-14 | Vesuvius Italia Spa | Slider closure for metallurgical vessels equipped with lateral torsion bars |
WO2006027804A1 (en) * | 2004-09-07 | 2006-03-16 | Co.Me.Ca. Costruzioni Meccaniche Carpenteria S.P.A. | Dispensing device for steel casting and the like |
CN110369700B (en) * | 2019-07-08 | 2021-07-09 | 唐山不锈钢有限责任公司 | One-key type remote buggy ladle positioning and automatic cap removing and capping control device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1004615B (en) * | 1973-10-16 | 1976-07-20 | Sirma Soc Italiana | SHUTTER WITH A MOVABLE ORGAN ABLE IN ANGULAR MOVEMENT, COLARLY PARTS FOR CHECKING THE FLOW OF MELTED METALS FROM CONTAINERS OR LADIES |
JPH0335481Y2 (en) * | 1984-09-11 | 1991-07-26 | ||
ATE98918T1 (en) * | 1989-06-02 | 1994-01-15 | Sanac Nuova Spa | SLIDE CLOSURE FOR FOUNDING LADLES AND SIMILAR DEVICES. |
-
1990
- 1990-03-02 IT IT12435A patent/IT1240587B/en active IP Right Grant
-
1991
- 1991-03-04 DE DE69129504T patent/DE69129504T2/en not_active Expired - Fee Related
- 1991-03-04 ES ES91830071T patent/ES2031795T3/en not_active Expired - Lifetime
- 1991-03-04 EP EP91830071A patent/EP0445087B1/en not_active Expired - Lifetime
- 1991-03-04 DE DE199191830071T patent/DE445087T1/en active Pending
- 1991-03-04 AT AT91830071T patent/ATE166815T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ES2031795T3 (en) | 1998-10-16 |
DE69129504D1 (en) | 1998-07-09 |
EP0445087A3 (en) | 1992-04-29 |
IT9012435A0 (en) | 1990-03-02 |
DE69129504T2 (en) | 1999-01-07 |
DE445087T1 (en) | 1992-04-30 |
IT9012435A1 (en) | 1991-09-02 |
EP0445087A2 (en) | 1991-09-04 |
IT1240587B (en) | 1993-12-17 |
ATE166815T1 (en) | 1998-06-15 |
ES2031795T1 (en) | 1993-01-01 |
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