EP3259085B1 - Verfahren und vorrichtung zur reparatur einer feuerfesten hülse eines metallurgischen gefässes - Google Patents

Verfahren und vorrichtung zur reparatur einer feuerfesten hülse eines metallurgischen gefässes Download PDF

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Publication number
EP3259085B1
EP3259085B1 EP15805170.6A EP15805170A EP3259085B1 EP 3259085 B1 EP3259085 B1 EP 3259085B1 EP 15805170 A EP15805170 A EP 15805170A EP 3259085 B1 EP3259085 B1 EP 3259085B1
Authority
EP
European Patent Office
Prior art keywords
mortar
sleeve
dispenser
wall
pipe
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.)
Active
Application number
EP15805170.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3259085A1 (de
Inventor
Raphael RENGGLI
Damian SCHACHER
Paul Guenther
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.)
Refractory Intellectual Property GmbH and Co KG
Original Assignee
Refractory Intellectual Property GmbH and Co KG
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 Refractory Intellectual Property GmbH and Co KG filed Critical Refractory Intellectual Property GmbH and Co KG
Priority to PL15805170T priority Critical patent/PL3259085T3/pl
Publication of EP3259085A1 publication Critical patent/EP3259085A1/de
Application granted granted Critical
Publication of EP3259085B1 publication Critical patent/EP3259085B1/de
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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
    • B22D41/50—Pouring-nozzles
    • B22D41/52—Manufacturing or repairing thereof
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings
    • C21C5/445—Lining or repairing the taphole
    • 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
    • F27D1/1626—Making linings by compacting a refractory mass in the space defined by a backing mould or pattern and the furnace wall
    • 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
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1509—Tapping equipment
    • F27D3/1536—Devices for plugging tap holes, e.g. plugs stoppers
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/12—Opening or sealing the tap holes

Definitions

  • the invention relates to a method for repairing a refractory sleeve of a metallurgical vessel according to the preamble of claim 1 or to a device for carrying out the method.
  • Refractory sleeves of the type mentioned at the beginning include the inner sleeves of pouring ladles containing molten metal.
  • the inner sleeve is inserted in a perforated brick of the refractory ladle lining and connects on the outside with the closure plate of a slide closure.
  • the inner sleeve forms the pouring channel of the pouring ladle and is therefore exposed to very strong wear and tear during operation. It is therefore often necessary to replace the worn sleeves with new, intact sleeves.
  • this process is usually very time-consuming, as you first have to break out the worn sleeve, repair the damaged seating surface of the perforated stone and then install the new sleeve so that it is correctly centered in the vessel. This results in long downtimes for the affected vessels.
  • a material feed pipe is provided with an impeller arranged on the front, which is driven by a rotary axis with a motor and deflects the material to be applied outwards to the point to be repaired.
  • the material is thereby deflected through this pipe up to openings in its front end face and to the impeller and by this and conveyed to the outside onto the surface of the spout to be repaired.
  • a device for repairing an opening in which a tubular element is provided with lateral bores, in which a piston accessible from the outside is integrated at one end, by means of which a mortar can be pressed through these bores.
  • the mortar since the mortar is relatively viscous, it can only be distributed with great effort and not evenly from all the holes. In addition, there is no guarantee that it will effectively remain in the container spout and not be partially torn out again after the tubular element has been ejected and subsequently pulled out of the container spout.
  • a repair device is provided with a repair head connected to a pipe and several lines leading through the pipe, sometimes for supplying refractory material, which is pressed against the inner circumferential surface of the spout.
  • a repair head connected to a pipe and several lines leading through the pipe, sometimes for supplying refractory material, which is pressed against the inner circumferential surface of the spout.
  • an expanding pressing tool is arranged on the outer jacket of the repair head.
  • the refractory material is dried and cured by a heating device on the repair head. Due to these multiple functions of this head, a complicated structure is given, which can hardly be implemented with the relatively thin bores and there is also a risk of clogging in this head.
  • the invention is based on the object of creating a method for repairing worn sleeves that ensures operational reliability and dimensional accuracy of the repaired sleeves.
  • the sleeve repair is carried out by mortaring the casting channel of the sleeve with a mortar dispenser which can be pushed into the casting channel in a known manner and which calibrates it over the entire length of the channel when it is withdrawn from the casting channel, the mortar dispenser during the Mortar is rotated coaxially to the pouring channel and after a defined period of time is also pulled out of the pouring channel while rotating.
  • the repair method according to the invention is characterized in that it can be carried out with a relatively small outlay in terms of equipment, because the rotating mortar dispenser accomplishes both the even mortaring of the duct wall and its precise calibration.
  • the method also has the advantage of a minimized expenditure of time, since it can be carried out at a relatively high vessel temperature, and because both the mortar-out and the hardening of the applied mortar mass take place quickly.
  • the process also makes it possible to automate the function of the mortar dispenser and to adapt it to relevant parameters such as the nature of the sleeve or that of the mortar used in each case.
  • the mortar dispenser is rotated at a comparatively fast rotational speed when mortaring out the pouring channel of the sleeve, which is such that the centrifugal force generated injects the mortar mass onto the channel wall of the sleeve with a strong centrifugal effect.
  • the invention also provides that when the rotating mortar dispenser is withdrawn from the pouring channel, the mortar mass sprayed onto the channel wall is stripped off helically with the mortar dispenser, the rotational speed of the mortar dispenser being adjustable depending on the nature of the mortar and the structure and nature of the channel wall. This way the mortar dispenser will deduct facilitated from the pouring channel, and this receives a perfectly smooth inner wall.
  • the invention also provides that the sleeve is mortared out at a sleeve temperature of preferably above 300.degree.
  • the device according to the invention for performing the proposed method is characterized in that the mortar dispenser is formed by a tubular part rotating around the longitudinal axis with radially longitudinally directed lamellae, the length of which corresponds to the length of the pouring channel of the sleeve to be repaired and whose outer diameter defined by the lamellae is equal to the nominal value of the Is dimensioned pouring channel diameter of the sleeve.
  • the mortar mass is evenly thrown out onto the duct wall of the sleeve by the rotating lamellae, so that the duct wall is covered with a compact and well-adhering layer of mortar.
  • the lamellae are slightly convexly curved in the direction of rotation of the tubular part.
  • the lamellae which rotate helically when the device is withdrawn, ensure precise calibration of the pouring channel with a perfectly smooth channel surface.
  • Fig. 1 shows a partial area of a steel pan 1, the spout 2 of which can be provided with a sliding lock, not shown.
  • the steel pan 1 has an outer steel jacket 3 with a refractory lining 4, in which a refractory perforated brick 5 for receiving an inner sleeve 6 made of refractory material is installed.
  • the sleeve repair is carried out according to the invention by mortaring the inner wall 6 'of the sleeve 6 with a mortar dispenser 9 which can be pushed into the pouring channel 7 and through which the mortar is conveyed outwards into a cavity 14 formed between the mortar dispenser 9 and the worn inner wall 6' of the sleeve 6.
  • the sleeve is mortared and calibrated with sufficient adhesive strength over the entire length of the channel.
  • the device 8 is operated according to the invention in such a way that the mortar dispenser 9 rotates relatively quickly for a defined time coaxially with the pouring channel 7 during mortaring and is pulled out of it while the mortar is hardening. In this way, the inner wall 6 'of the restored pouring channel 7 is machined evenly and smoothly, and during pouring it is prevented that melt flowing through is held back due to unevenness and possibly sticking.
  • the speed of rotation of the mortar dispenser 9 corresponds, for example, to that of a hand drill with approximately 500 to 1,000 revolutions per minute.
  • a drive shaft 19 for a rotary drive coupled to the mortar dispenser is shown.
  • the mortar dispenser 9 is rotated for a total of 60 seconds, for example, and if the inner wall of the sleeve is mortared at a sleeve temperature of preferably above 300 ° C. In this way, the sleeve repair can be carried out on the still hot pouring ladle.
  • the speed of rotation of the device can be a function can be adjusted by the nature of the mortar and the structure and nature of the sewer wall.
  • the mortar dispenser 9 consists of a cylindrical pipe part 10 with radially longitudinally directed lamellae 11, the length of the pipe part corresponding to the pouring channel length of the sleeve 6, while its outer diameter defined by the lamellae 11 is equal to the nominal value of the channel diameter of the inner sleeve.
  • the lamellae 11 are aligned axially parallel to the pipe part 10 and delimited at both ends by disc-shaped flanges 12, so that elongated free spaces 13 are formed between the individual lamellae for receiving the refractory mortar.
  • the mortar By rotating the pipe part 10, the mortar is thrown out of the free spaces 13 and evenly applied to the worn inner wall 6 'of the sleeve 6 over the entire length of the channel, the centrifugal effect contributing to the fact that the mortar is firmly attached to the inner wall 6' and the cavity 14 formed can stick in between.
  • the lamellae 11 are slightly convexly curved in the direction of rotation of the pipe part 10, so that the mortar is pushed outwards over the outer edges 11 'formed, and these edges 11' have a cutting effect.
  • the lamellae 11 rotating with the pipe part 10 also serve to strip off the excess mortar and to calibrate the pouring channel of the inner sleeve without damaging the channel wall. This also applies when pulling off the device, because then the rotating one continues Pipe part 10 completes a helical movement, which significantly supports the withdrawal process.
  • These free spaces 13 of the mortar dispenser 9 are advantageously dimensioned in such a way that a predetermined amount of mortar can be poured into it, for example by hand, which approximately corresponds to the cavity 14 formed between the mortar dispenser and the inner wall of the sleeve, so that such stripping of the mortar is made possible.
  • These free spaces 13 are therefore filled with mortar in such a way that this mortar is filled approximately flush with the outer circumference of the lamellae 11 and is evenly distributed in the process.
  • the sleeve repair method according to the invention is particularly suitable for casting systems in which the maintenance and delivery of the sliding closure of the pans is carried out centrally by means of a robot in a maintenance station, the so-called pan area.
  • Fig. 4 shows the spout of a pouring ladle 1 located in the maintenance station, in the perforated brick 5 of which an inner sleeve 6 is inserted.
  • a sliding closure 20, known per se, for closing and opening the pouring channel 7 is connected to the latter.
  • the wear zone 15 extends from the free passage area of the perforated brick 5 to the exit of the inner sleeve 6, with a fireproof closure plate (not shown) in the housing 21 of the slide closure 20 tightly adjoining this there.
  • the ladle 1 is in Fig. 4 in the maintenance position, in which it is laid horizontally.
  • the slide lock 20 is partially in Section with the refractory components that can be used in its mechanics, namely the closure plate, the slide plate and the pouring sleeve.
  • the sleeve 6 of the pouring ladle is freely accessible after the slide unit 16 of the slide lock has been pivoted out and the base plate has been removed, and can be repaired in the maintenance station while the maintenance and delivery of the slide lock is being carried out. The repair is done automatically there, preferably with the robot used to change plates.
  • a suitable repair device 17 is shown. It differs from the device 8 according to Fig. 2 only in that it has a second pipe part 18 of a mortar supply device provided as an extension to the pipe part 10 for coupling the device to the robot, which pipe part can simultaneously serve to supply the other pipe part 10 with mortar.
  • the repair device 17 is automatically and precisely positioned with the robot and driven via its drive shaft 19 in such a way that it is rotated in the pouring channel 7 at the optimum rotational speed in each case.
  • the device according to the invention can readily be designed differently than in the exemplary embodiment described. The only thing that matters is that it works as described above.
  • the sleeve repair method according to the invention is of course also suitable for other sleeves which are fastened in a refractory vessel lining and are exposed to severe wear there, such as those in a tapping of a converter, an electric furnace, or in a tundish.
  • Perforated stones, sleeve inserts, Free-wheeling nozzles or sleeve-shaped injected channels as sleeves can be repaired with the method according to the invention.
  • the method is particularly advantageous for repairing the inner sleeves of pouring ladles, because it offers the possibility of quickly repairing the inner sleeve in the course of the automation of the casting operation with every plate change and thus reducing the need for new inner sleeves. There is no need to clean the perforated stone when changing the case. The wear and tear on the perforated brick is reduced and there is no disruptive sintering.
  • lamellas instead of lamellas, other-shaped means delimiting the free spaces, for example thread-like elevations, could also be provided on the pipe part of the mortar dispenser.
  • this conveying of the mortar to the inner wall of a sleeve could also take place by pushing it outwards, for example by means of a cylindrical inflatable balloon-like body or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP15805170.6A 2015-02-20 2015-12-04 Verfahren und vorrichtung zur reparatur einer feuerfesten hülse eines metallurgischen gefässes Active EP3259085B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15805170T PL3259085T3 (pl) 2015-02-20 2015-12-04 Sposób i urządzenie do naprawy ogniotrwałej tulei naczynia metalurgicznego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00243/15A CH710773B1 (de) 2015-02-20 2015-02-20 Verfahren und Vorrichtung zur Reparatur einer feuerfesten Hülse eines metallurgischen Gefässes.
PCT/EP2015/078719 WO2016131510A1 (de) 2015-02-20 2015-12-04 Verfahren und vorrichtung zur reparatur einer feuerfesten hülse eines metallurgischen gefässes

Publications (2)

Publication Number Publication Date
EP3259085A1 EP3259085A1 (de) 2017-12-27
EP3259085B1 true EP3259085B1 (de) 2021-05-26

Family

ID=54783603

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EP15805170.6A Active EP3259085B1 (de) 2015-02-20 2015-12-04 Verfahren und vorrichtung zur reparatur einer feuerfesten hülse eines metallurgischen gefässes

Country Status (17)

Country Link
US (1) US10857593B2 (pl)
EP (1) EP3259085B1 (pl)
JP (1) JP6849601B2 (pl)
KR (1) KR102495554B1 (pl)
CN (1) CN107206483B (pl)
AR (1) AR103741A1 (pl)
BR (1) BR112017015145B1 (pl)
CA (1) CA2973136C (pl)
CH (1) CH710773B1 (pl)
ES (1) ES2878410T3 (pl)
MX (1) MX2017010438A (pl)
PL (1) PL3259085T3 (pl)
RU (1) RU2707684C2 (pl)
TW (1) TWI682819B (pl)
UA (1) UA122141C2 (pl)
WO (1) WO2016131510A1 (pl)
ZA (1) ZA201705337B (pl)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH710773B1 (de) 2015-02-20 2019-04-30 Refractory Intellectual Property Gmbh & Co Kg Verfahren und Vorrichtung zur Reparatur einer feuerfesten Hülse eines metallurgischen Gefässes.
EP3424618B1 (de) 2017-07-05 2021-03-10 Refractory Intellectual Property GmbH & Co. KG Schiebeverschluss für ein metallschmelze enthaltendes gefäss

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Also Published As

Publication number Publication date
ES2878410T3 (es) 2021-11-18
TW201637752A (zh) 2016-11-01
CA2973136C (en) 2023-03-07
AR103741A1 (es) 2017-05-31
TWI682819B (zh) 2020-01-21
US10857593B2 (en) 2020-12-08
JP2018508362A (ja) 2018-03-29
CN107206483B (zh) 2021-09-07
RU2017129309A3 (pl) 2019-06-20
CA2973136A1 (en) 2016-08-25
CH710773A2 (de) 2016-08-31
UA122141C2 (uk) 2020-09-25
RU2707684C2 (ru) 2019-11-28
RU2017129309A (ru) 2019-03-20
EP3259085A1 (de) 2017-12-27
PL3259085T3 (pl) 2021-11-15
CH710773B1 (de) 2019-04-30
BR112017015145A2 (pt) 2018-01-23
WO2016131510A1 (de) 2016-08-25
KR20170119686A (ko) 2017-10-27
MX2017010438A (es) 2017-11-13
BR112017015145B1 (pt) 2021-09-28
CN107206483A (zh) 2017-09-26
ZA201705337B (en) 2018-12-19
JP6849601B2 (ja) 2021-03-24
KR102495554B1 (ko) 2023-02-02
US20180029117A1 (en) 2018-02-01

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