EP4281723A1 - Shielding shoe for walking beam furnaces - Google Patents
Shielding shoe for walking beam furnacesInfo
- Publication number
- EP4281723A1 EP4281723A1 EP21805961.6A EP21805961A EP4281723A1 EP 4281723 A1 EP4281723 A1 EP 4281723A1 EP 21805961 A EP21805961 A EP 21805961A EP 4281723 A1 EP4281723 A1 EP 4281723A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shielding
- shoe
- walking beam
- post
- beam furnace
- 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.)
- Pending
Links
- 239000004567 concrete Substances 0.000 claims abstract description 13
- 239000011373 stamped concrete Substances 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 241000190070 Sarracenia purpurea Species 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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
- F27B9/14—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 tunnel furnace
- F27B9/201—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 tunnel furnace walking beam furnace
-
- 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
- F27D1/0003—Linings or walls
- F27D1/0033—Linings or walls comprising heat shields, e.g. heat shieldsd
-
- 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
- F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements
-
- 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
- F27D99/0073—Seals
-
- 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
- F27D2003/0046—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising one or more movable arms, e.g. forks
- F27D2003/0048—Walking beams
Definitions
- the object of this invention is a shielding shoe for covering openings in the bottom of a walking beam furnace.
- the shielding shoe is fastened to a vertical post of the walking beam furnace in the area of a semicircular recess and essentially consists of refractory poured concrete or refractory stamped concrete.
- the subject of this invention is also a walking beam furnace which has the shielding shoe according to the invention.
- the shielding shoe is a refractory prefabricated component that is installed to cover the scale funnels and slot openings in the floor of walking beam furnaces.
- Walking beam furnaces are used in rolling mills to heat slabs, blocks or billets to rolling temperature.
- the walking beam conveyors consist of walking beams, which are supported by vertical supports, the so-called uprights, also called standing tubes or lifting support tubes, and which are given the working movement in the form of a rectangular orbit over the uprights.
- the latter consist of high-strength steel tubes with a ceramic jacket and associated tube cooling.
- the uprights pass through approximately slit - shaped openings on the kiln floor , with below the kiln floor or
- the drive of the walking beam conveyor together with additional units can be arranged on the furnace floor.
- Two shielding shoes are fastened per upright above the slots and are intended to avoid or reduce the loss of energy from the furnace through direct radiation into the water cup. Reduce . The shielding shoes are getting strong stressed and must therefore be replaced at certain intervals
- the prior art shielding shoes are made of refractory concrete with a mounting plate that is welded to the post. Slotted pins of various lengths are arranged on the sheet to fix the refractory concrete to the sheet. Two shielding shoes are each placed on a separate plate-like steel console in order to be able to absorb the increased weight of the prefabricated components.
- the refractory cast concrete of the shielding shoe is "green" when delivered and is therefore not thermally treated due to the metal components used. This also results in a limited storage time for the shielding shoe.
- a shielding shoe is already known from DE 20 2019 002 656 U1, which has a steel-free shielding body and is therefore fired or sintered before assembly.
- the shielding shoe according to DE 20 2019 002 656 Ul however, it is also a heavy, unwieldy component that is difficult to assemble in the tight space conditions that prevail in walking beam furnaces.
- the invention is therefore based on the object of providing a shielding shoe that can be mounted more easily.
- the shielding shoe according to the invention has a honeycomb structure underneath the shielding casing.
- the honeycomb structure is also made of refractory poured concrete or refractory stamped concrete.
- the new shielding shoe essentially only consists of poured and fired (up to 1,400 °C possible) refractory poured concrete or refractory stamped concrete.
- the shielding shoe is considerably lighter than conventional shielding shoes. A weight saving of more than 35% is possible.
- the honeycomb structure nevertheless ensures the required stability.
- the shielding casing preferably has a constant thickness above the honeycomb structure. This allows stresses in the material to be minimized.
- the honeycomb structure that is to say the webs of the honeycomb, has a uniform wall thickness, as this also allows stresses to be reduced.
- the form has
- the curved brackets ensure a secure hold.
- the shielding shoe can rest on a retaining ring attached to the post. It is advantageous if a retaining clip and a retaining ring halves each form a one-piece component, which makes assembly on the post particularly simple. However, these can also be separate components.
- the shielding shoe preferably has at least one, preferably two, block holes on its upper side, that is to say in the shielding jacket. Clamps can then be screwed into these clamp holes as an assembly aid.
- the present invention also relates to a walking beam furnace with at least one post that protrudes through an opening in the floor of the walking beam furnace. According to the invention, two shielding shoes according to one of claims 1 to 6 are fastened to the post.
- FIG. 2 shows a plan view of the shielding shoes from FIG. 1;
- FIG. 3 shows a schematic cross section through two mounted shielding shoes according to the invention
- FIG. 4 shows a plan view of the two shielding shoes according to the invention from FIG. 3;
- FIG. 1 and FIG. 2 each show two conventional shielding shoes 2 which are fastened to a post 1.
- FIG. These shielding shoes 2 usually consist of:
- the ceramic fiber mat 5 is attached as slotted pins 4 to the rolled sheet 3 with the anchors already welded on. Then the slotted pins 4 are spread open. The entire unit forms a shielding shoe 2 with the refractory cast concrete cast in a mold.
- a halved cast plate 6 (also called plate) is used for the assembly and for the support of the shielding shoe 2 .
- the two parts (left and right) of the cast plate 6 are placed in a predetermined position on the post 1, welded and covered with a ceramic fiber mat 7.
- Two shielding shoes 2 are required to completely cover the bottom slot. During assembly, a Shielding shoe 2 placed on one half of the cast plate 6 and the other on the second half. Both shielding shoes 2 are welded to the rolled sheet metal 3 on the post 1 .
- the welded-on metal sheets 3 In order to change a shielding shoe 2, the welded-on metal sheets 3 must be separated from the post 1 and the metal sheets 3 of the new shielding shoes 2 must be welded on again in the same position.
- FIGS. 3 and 4 now show an exemplary embodiment for the shielding shoes la according to the invention.
- the shielding shoes 1a have a semicircular recess 9a for receiving on the post 5a.
- two new retaining clips 2a made of highly heat-resistant stainless steel or Cast stainless steel welded to the post 5a and covered with a ceramic fiber mat 4a towards the furnace chamber.
- the retaining clip 2a is C-shaped in the present example. In plan view, this is a C-shaped component which is welded to the post 5a with its rear side.
- the new shielding shoe la In order to assemble or disassemble the new shielding shoe la, this is pushed onto the new retaining brackets 2a or. taken out .
- two curved slots 10a are provided in the shielding shoe la in the region of its semicircular recess 9a, in which the two legs of the retaining clip 2a can be accommodated.
- the shielding shoe 1a is held securely by the curved shape of the slots 10a and the risk of stress cracks is minimized.
- the shielding shoe 1a rests on a circular retaining ring 6a.
- the upper side of the shielding shoe 1a is formed by the shielding jacket 8a.
- the shielding jacket here has a uniform thickness x.
- the honeycomb structure 7a which is also made of refractory cast concrete or. consists of refractory stamped concrete. This honeycomb structure is produced by pouring the concrete into a suitable mold, leaving out the future webs of the honeycomb.
- the honeycomb structure 7a has a uniform wall thickness y.
- a block hole 3a is provided in the shielding shoe 1a to facilitate assembly/disassembly. During assembly/disassembly, a block with an eyelet is screwed into the block hole 3a, into which the hook of a lifting tool can then be hung. For operation, the pin hole 3a can be sealed with a fireproof compound.
- the new shielding shoe la is thermally pre-treated (up to 1,400 °C possible). This means that long - term storage in a dry and frost - free place is possible without loss of quality .
- two identical shielding shoes 1a are attached to the post 5a.
- they have an elliptical floor plan in common.
- two retaining clips 2a are fastened to the post 5a here.
- the shielding jackets 8a of the two shielding shoes la form an umbrella-like shape here, so that falling scale can slide off the shielding jacket 8a. This will become disruptive
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA50030/2021A AT523403B1 (en) | 2021-01-21 | 2021-01-21 | SHIELD SHOE FOR LIFTING BEAM OVEN |
PCT/EP2021/081050 WO2022156932A1 (en) | 2021-01-21 | 2021-11-09 | Shielding shoe for walking beam furnaces |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4281723A1 true EP4281723A1 (en) | 2023-11-29 |
Family
ID=77411372
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21805961.6A Pending EP4281723A1 (en) | 2021-01-21 | 2021-11-09 | Shielding shoe for walking beam furnaces |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4281723A1 (en) |
AT (1) | AT523403B1 (en) |
WO (1) | WO2022156932A1 (en) |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2204602C2 (en) * | 1972-02-01 | 1973-12-06 | Didier-Kellogg Industrieanlagenbau Gmbh, 4300 Essen | Slot seal for walking beam oven |
JPS59200717A (en) * | 1983-04-28 | 1984-11-14 | Nippon Steel Corp | Shielding construction in aperture part of moving beam post of billet heating furnace |
JPS6082451U (en) * | 1983-11-10 | 1985-06-07 | 石川島播磨重工業株式会社 | Heat shielding lid for the hearth opening of a walking beam heating furnace |
JPH0449Y2 (en) * | 1985-08-29 | 1992-01-06 | ||
DE3705822A1 (en) * | 1987-02-24 | 1988-09-01 | Italimpianti Deutschland Gmbh | RIFLE BAR OVEN |
US4838785A (en) * | 1988-07-05 | 1989-06-13 | Cameron Forge Company | Walking beam furnace insulation |
JP2702631B2 (en) * | 1991-12-12 | 1998-01-21 | 株式会社クボタ | Hearth opening cover support members |
DE4440275A1 (en) * | 1994-11-11 | 1996-05-15 | Schulte D W Gmbh & Co Kg | Cover shoe for use on the walking beam conveyor of a walking beam furnace |
DE9422056U1 (en) * | 1994-11-11 | 1997-10-23 | D.W. Schulte GmbH & Co. KG, 58840 Plettenberg | Cover shoe for use on the walking beam conveyor of a walking beam furnace |
KR100516125B1 (en) * | 2001-12-22 | 2005-09-21 | 주식회사 포스코 | Insulation method for a walking beam type furnace |
EP1528343A1 (en) * | 2003-10-27 | 2005-05-04 | Siemens Aktiengesellschaft | Refractory tile with reinforcing members embedded therein, as liner for gas turbine combustion chamber |
DE202019002656U1 (en) | 2019-06-24 | 2020-09-28 | Intocast Ag | Radiation shoe |
-
2021
- 2021-01-21 AT ATA50030/2021A patent/AT523403B1/en active
- 2021-11-09 EP EP21805961.6A patent/EP4281723A1/en active Pending
- 2021-11-09 WO PCT/EP2021/081050 patent/WO2022156932A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2022156932A1 (en) | 2022-07-28 |
AT523403B1 (en) | 2021-08-15 |
AT523403A4 (en) | 2021-08-15 |
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