CA2088850A1 - Device for carrying a charge in a furnace - Google Patents
Device for carrying a charge in a furnaceInfo
- Publication number
- CA2088850A1 CA2088850A1 CA 2088850 CA2088850A CA2088850A1 CA 2088850 A1 CA2088850 A1 CA 2088850A1 CA 2088850 CA2088850 CA 2088850 CA 2088850 A CA2088850 A CA 2088850A CA 2088850 A1 CA2088850 A1 CA 2088850A1
- Authority
- CA
- Canada
- Prior art keywords
- skid pipe
- riders
- carrying
- longitudinal direction
- charge
- 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.)
- Abandoned
Links
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
- F27D3/02—Skids or tracks for heavy objects
- F27D3/022—Skids
-
- 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
- F27D5/00—Supports, screens, or the like for the charge within the furnace
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A device for carrying a charge in a reheating furnaces comprising at least one skid pipe through which a cooling fluid flows, the skid pipe having at least one rider provided with at least one surface to support said charge running off center in the longitudinal direction of the skid pipe. According to the invention neighboring surfaces are laterally spaced relative to each other and run at least partially to the side of the skid pipe. Charge exposure to the relatively low temperature around the skid pipe is kept at a very low level and charge temperature is therefore very uniform.
A device for carrying a charge in a reheating furnaces comprising at least one skid pipe through which a cooling fluid flows, the skid pipe having at least one rider provided with at least one surface to support said charge running off center in the longitudinal direction of the skid pipe. According to the invention neighboring surfaces are laterally spaced relative to each other and run at least partially to the side of the skid pipe. Charge exposure to the relatively low temperature around the skid pipe is kept at a very low level and charge temperature is therefore very uniform.
Description
~ ~ ~ $ ~i h ~
Device for Carrying a Charge in a Furnace B~CKGROVND OF THE INVENTION
The present invention relates to a device for carrying a charge and more particularly slabs, billets, ingots and the llke in a furnace, said device comprising at least one skid pipe through which a cooling fluid flows and at least two riders fit fox service at elevated temperature arranged on said skid pipe and having at least one surface to support said charge running off-center substantially parallel to said skid pipe.
A device of the kind hereinbefore described ls known from German Patent No. 34 34 356. Said patent divulges a skid system comprising riders with carrying surfaces located alternately to the left and to the right of the center plane of the skid system to reduce charge skid marks attributable to the charge resting on its support. Such skid marks representing charge areas of relatively low temperature are a distinct disadvantage because they are the cause of quality difficiencies such as differences in thickness and width and texture variations in the rolled product unless said skid marks are removed prior to rolling by relatively complex and costly operations.
Experience has taught that skid marks may be produced not only by the surfaces of ridexs carrying the charge in a walking beam furnace or the like but also by the skid pipes through which cooling fluid passes thereby creating areas of relatively low temperatureO The quality deficiencies associated with said relatively cool areas are becoming increasingly important as specifications of final products become more and more stringent.
T~E INVENTION
It is an object of the present invention to improve skid systems of the kind described hereinbefore and to make -provision for a very even and uniform temperature distribution in the charge by reasonably simple means which do not have a major impact on production operations.
Device for Carrying a Charge in a Furnace B~CKGROVND OF THE INVENTION
The present invention relates to a device for carrying a charge and more particularly slabs, billets, ingots and the llke in a furnace, said device comprising at least one skid pipe through which a cooling fluid flows and at least two riders fit fox service at elevated temperature arranged on said skid pipe and having at least one surface to support said charge running off-center substantially parallel to said skid pipe.
A device of the kind hereinbefore described ls known from German Patent No. 34 34 356. Said patent divulges a skid system comprising riders with carrying surfaces located alternately to the left and to the right of the center plane of the skid system to reduce charge skid marks attributable to the charge resting on its support. Such skid marks representing charge areas of relatively low temperature are a distinct disadvantage because they are the cause of quality difficiencies such as differences in thickness and width and texture variations in the rolled product unless said skid marks are removed prior to rolling by relatively complex and costly operations.
Experience has taught that skid marks may be produced not only by the surfaces of ridexs carrying the charge in a walking beam furnace or the like but also by the skid pipes through which cooling fluid passes thereby creating areas of relatively low temperatureO The quality deficiencies associated with said relatively cool areas are becoming increasingly important as specifications of final products become more and more stringent.
T~E INVENTION
It is an object of the present invention to improve skid systems of the kind described hereinbefore and to make -provision for a very even and uniform temperature distribution in the charge by reasonably simple means which do not have a major impact on production operations.
- 2 - 2~8 ~s~ ~
To provide such msans the present invention teaches that neighbouring charge carrying surEaces should be laterally spaced relativ to each other and run at least partially to the slde of the skid pipe.
The riders of which said surfaces form parts are sequentially arranged along the skid pipe, the positions of their carrying sur-faces relative to said skid pipe alternatiny.
The surface areas of said carrying surfaces are minimized for the mass of the charge they are designed to support. As in accordance with the present invention said carxying surfaces are at least partially located to the two sides of said skid pipe off the skid pipe center, skid marks attributable to the relatively cool area around the skid pipe are kept at a relatively low level because the bottom of the charge and above all the part of the charge underside above the center of the skid pipes may be heated directly beyond the centerline represented by the skid pipe from alternating sides as it is exposed for more than half of the charge furnace time.
With respect to such skid marks it is well known that uniform tem-perature distribution in the charge with substantially no skid marks is important to maintain specified dimensions more accurately in the rolling operation following reheating and to obtain a better quality rolled product.
In a preferred embodiment of the present invention, each face end of each rider is at the side opposite the charge carrying surface pro-vided with a protrusion substantially across half of the width of said face end, the side with said carrying surface thereby being recessed. The rider protrusion hereinbefore described penetrates into the recessed part of the next following rider. The inter-penetration of riders alternately exposed to a force rotating to the left and to the right respectively interlocks said riders thereby preventing said riders from being rotated off the skid pipe.
As an alternative in another preferred embodiment of the present invention each rider extends below the top surface of said skid pipe and rests on tilt stopping means firmly connected with said skid pipe underneath its charge carrying surface.
2 ~ 8 ~ ~
Further in another preferred embodiment of the device proposed by the present invention the rider surface to the side of its charge carrying surface is roof-shaped and said roof-shaped surface is pro-vided with a cutout for the insertion of a ceramic component.
Said component may be made from any ceramic material which enhances the reflection of thermal radiation to increase heat transfer to the bottom surface of the charge.
The roof-shaped configuration of the rider surface of the area ad-jacent to the rider's charge carrying surface offers the additional advantage of preventing scale build-up.
Said surface may be inclined in the direction of charge travel but is perfectly sloped in the transverse direction because the slope in the transverse direction may be steeper than the slope in the longitudinal direction.
Further, in yet another embodiment of the present invention the rider may be fitted around a fitting on said rider and a bolt is passed through said fitting and through said rider in a direction trans-verse to the longitudinal e~tension of the skid pipe. Such a bolted joint is simple and allows easy rider replacement after removal of said bolt by a hammer blow or the like without any cutting or welding operation being necessary.
It is apparent to any skilled person versed in the art that the em-bodiments of the present invention described hereinbefore may be combined in various ways without altering the substance of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described with the help of pre-ferred embodiments illustrated in the acompanying drawings.
Fig. 1 shows a cross section of an embodiment of the present invention ~ ~ 2 ~
Fig. 2 shows another embodiment of -the present invention along line I - I in Fig. 3 Fig. 3 is a partial top view of the embodiment of the present invention shown in Fig. 2 DETAI~ED DESCRIPTION OF THE PRESENT INVENTION
Referring first to Fig. 1 and Fig. 2, the embodiment of the present invention shown therein comprises a skid pipe (1) running in the longitudinal direction of a furnace,. A coollng fluid which may be water or steam flows through said s}cid pipe for skid pipe cooling.
Said skid pipe (1) is provided with a multiplicity of riders (2) to carry the charge (3), each such rider (2) has a charge carrying sur-face (4) on which said charge (3) rests. Said charge carrying surface (4) runs partially to one side of said skid pipe. Riders (2) are arranged on said skid pipe in alternating sequence to displace the charge carrying surfaces (4) of two neighbouring riders relative to each other thereby allowing the charge bottom and more particularly the charge bottom area over the center of said skid pipe to be heated directly beyond the charge centerline from alternating sides for more than half of the charge furnace time.
To the side of said charge carrying surface (4), a surface (5~ of the rider (2) is roof-shaped with a lateral slope to allow any scale to fall down said slope. Said surface (5) is provided with a cut-out (6) filled by ceramic material which protects the rider made from cast material for elevated temperature surface against overheating and enhances heat transfer to the charge bottom by reflecting thermal radiation.
In the embodimen-t of the present invention depicted in Fig. 1, strip-type built stopper means (8) welded to skid pipe (1) are pro-vided below the charge carrying surface (4) of the rider (2).
Said rider (2) fits around a fitting (9) on said skid pipe (1). A
bolt (10) passes through said fitting (9) and said rider (2) in a direction transverse to the longitudinal direction of said skid pipe (l) and is fastened by tack-welding. If necesseary, said bolt (10) may be removed e~sily by a blow allowing the easy removal of riser (2).
Said riser (2) extends around the upper part of the cooled skid pipe (1) approaching the skid pipe insulation system (11), the gap (12) between said skid pipe insulation system (11) and the rider (2) being filled with ceramic fiber material.
In the embodiments of the present invention depicted in E'igs. 2 and 3, the sides of the rider faces opposite the charge carrying surface (4) are provided with protrusions (13) substantially over half the face width, recesses (1~) recognisable in Fig. 3 thereby being formed on the riser face sides underneath the charge carrying surface (4).
Each protrusion (14) penetrates into recess (13a) of the neigh-bouring rider (2a).
Said interpenetration of the riders (2 and 2a) being exposed to forces acting in the counterclockwise and in the clockwise senses respectively interlock said riders and thereby prevents said riders from being turned off said skid pipe.
Fig. 3 is a partial top view of two complete riders (2 and 2a). Gaps (15) filled with ceramic fiber material or the like are provided between said two riders to accommodate thermal expansion.
It is apparent to any person versed in the art that further embodi-ments of the present invention may be devised. A rider may be pro-vided with more than one (for example two) charge carrying surfaces arranged in a stagge!red row behind each other. Further, the skid pipe cross-section may be round or rectangular.
To provide such msans the present invention teaches that neighbouring charge carrying surEaces should be laterally spaced relativ to each other and run at least partially to the slde of the skid pipe.
The riders of which said surfaces form parts are sequentially arranged along the skid pipe, the positions of their carrying sur-faces relative to said skid pipe alternatiny.
The surface areas of said carrying surfaces are minimized for the mass of the charge they are designed to support. As in accordance with the present invention said carxying surfaces are at least partially located to the two sides of said skid pipe off the skid pipe center, skid marks attributable to the relatively cool area around the skid pipe are kept at a relatively low level because the bottom of the charge and above all the part of the charge underside above the center of the skid pipes may be heated directly beyond the centerline represented by the skid pipe from alternating sides as it is exposed for more than half of the charge furnace time.
With respect to such skid marks it is well known that uniform tem-perature distribution in the charge with substantially no skid marks is important to maintain specified dimensions more accurately in the rolling operation following reheating and to obtain a better quality rolled product.
In a preferred embodiment of the present invention, each face end of each rider is at the side opposite the charge carrying surface pro-vided with a protrusion substantially across half of the width of said face end, the side with said carrying surface thereby being recessed. The rider protrusion hereinbefore described penetrates into the recessed part of the next following rider. The inter-penetration of riders alternately exposed to a force rotating to the left and to the right respectively interlocks said riders thereby preventing said riders from being rotated off the skid pipe.
As an alternative in another preferred embodiment of the present invention each rider extends below the top surface of said skid pipe and rests on tilt stopping means firmly connected with said skid pipe underneath its charge carrying surface.
2 ~ 8 ~ ~
Further in another preferred embodiment of the device proposed by the present invention the rider surface to the side of its charge carrying surface is roof-shaped and said roof-shaped surface is pro-vided with a cutout for the insertion of a ceramic component.
Said component may be made from any ceramic material which enhances the reflection of thermal radiation to increase heat transfer to the bottom surface of the charge.
The roof-shaped configuration of the rider surface of the area ad-jacent to the rider's charge carrying surface offers the additional advantage of preventing scale build-up.
Said surface may be inclined in the direction of charge travel but is perfectly sloped in the transverse direction because the slope in the transverse direction may be steeper than the slope in the longitudinal direction.
Further, in yet another embodiment of the present invention the rider may be fitted around a fitting on said rider and a bolt is passed through said fitting and through said rider in a direction trans-verse to the longitudinal e~tension of the skid pipe. Such a bolted joint is simple and allows easy rider replacement after removal of said bolt by a hammer blow or the like without any cutting or welding operation being necessary.
It is apparent to any skilled person versed in the art that the em-bodiments of the present invention described hereinbefore may be combined in various ways without altering the substance of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described with the help of pre-ferred embodiments illustrated in the acompanying drawings.
Fig. 1 shows a cross section of an embodiment of the present invention ~ ~ 2 ~
Fig. 2 shows another embodiment of -the present invention along line I - I in Fig. 3 Fig. 3 is a partial top view of the embodiment of the present invention shown in Fig. 2 DETAI~ED DESCRIPTION OF THE PRESENT INVENTION
Referring first to Fig. 1 and Fig. 2, the embodiment of the present invention shown therein comprises a skid pipe (1) running in the longitudinal direction of a furnace,. A coollng fluid which may be water or steam flows through said s}cid pipe for skid pipe cooling.
Said skid pipe (1) is provided with a multiplicity of riders (2) to carry the charge (3), each such rider (2) has a charge carrying sur-face (4) on which said charge (3) rests. Said charge carrying surface (4) runs partially to one side of said skid pipe. Riders (2) are arranged on said skid pipe in alternating sequence to displace the charge carrying surfaces (4) of two neighbouring riders relative to each other thereby allowing the charge bottom and more particularly the charge bottom area over the center of said skid pipe to be heated directly beyond the charge centerline from alternating sides for more than half of the charge furnace time.
To the side of said charge carrying surface (4), a surface (5~ of the rider (2) is roof-shaped with a lateral slope to allow any scale to fall down said slope. Said surface (5) is provided with a cut-out (6) filled by ceramic material which protects the rider made from cast material for elevated temperature surface against overheating and enhances heat transfer to the charge bottom by reflecting thermal radiation.
In the embodimen-t of the present invention depicted in Fig. 1, strip-type built stopper means (8) welded to skid pipe (1) are pro-vided below the charge carrying surface (4) of the rider (2).
Said rider (2) fits around a fitting (9) on said skid pipe (1). A
bolt (10) passes through said fitting (9) and said rider (2) in a direction transverse to the longitudinal direction of said skid pipe (l) and is fastened by tack-welding. If necesseary, said bolt (10) may be removed e~sily by a blow allowing the easy removal of riser (2).
Said riser (2) extends around the upper part of the cooled skid pipe (1) approaching the skid pipe insulation system (11), the gap (12) between said skid pipe insulation system (11) and the rider (2) being filled with ceramic fiber material.
In the embodiments of the present invention depicted in E'igs. 2 and 3, the sides of the rider faces opposite the charge carrying surface (4) are provided with protrusions (13) substantially over half the face width, recesses (1~) recognisable in Fig. 3 thereby being formed on the riser face sides underneath the charge carrying surface (4).
Each protrusion (14) penetrates into recess (13a) of the neigh-bouring rider (2a).
Said interpenetration of the riders (2 and 2a) being exposed to forces acting in the counterclockwise and in the clockwise senses respectively interlock said riders and thereby prevents said riders from being turned off said skid pipe.
Fig. 3 is a partial top view of two complete riders (2 and 2a). Gaps (15) filled with ceramic fiber material or the like are provided between said two riders to accommodate thermal expansion.
It is apparent to any person versed in the art that further embodi-ments of the present invention may be devised. A rider may be pro-vided with more than one (for example two) charge carrying surfaces arranged in a stagge!red row behind each other. Further, the skid pipe cross-section may be round or rectangular.
Claims (14)
1. A device for carrying a charge and more particularly slabs, billets, ingots and the like in a furnace, said device com-prising - at least one skid pipe defining a longitudinal direction and a centerline running in said direction, said skid pipe being capable of carrying a cooling fluid flowing through said skid pipe; and - at least two riders capable of withstanding an elevated temperature arranged on said skid pipe, each such rider having at least one carrying surface capable of supporting said charge and running off-center substantially parallel to said centerline in said longitudinal direction, neighboring carrying surfaces being laterally spaced relative to each other and running at least partially to the side of said skid pipe.
2. The device according to claim 1 wherein each rider has two face ends, each face end consisting of a first part on the side of said carrying surface and a second part, said second part pro-truding in said longitudinal direction from said first part, said protruding second part of the face end of one of a series of riders being opposite to the first part of the face end of the neighboring rider.
3. The device according to claim 1 wherein at least one tilt stopping means connected with said skid pipe is provided and wherein at least one of said riders extends below the top surface of said skid pipe to rest on said tilt stopping means with its carrying surface above said tilt stopping means.
4. The device according to claim 1 wherein at least one of said riders is provided with a surface inclined in a direction transverse to said longitudinal direction to one side of said carrying surface.
5. The device according to claim 4 wherein said inclined surface is provided with a cut-out in which a ceramic component is arranged.
6. The device according to claim 1 wherein at least one of said riders is provided with a surface inclined in said longitudinal direction to one side of said carrying surface.
7. The device according to claim 6 wherein said inclined surface is provided with a cut-out in which a ceramic component is arranged.
8. The device according to claim 1 wherein at least one of said riders is provided with a surface inclined in said longitudinal direction and in a direction transverse to said longitudinal direction to one side of said carrying surface.
9. The device according to claim 8 wherein said inclined surface is provided with a cutout in which a ceramic component is arranged.
10. The device according to claim 1 wherein said skid pipe is provided with a fitting protruding upwardly into a recess in one of said riders, a bolt transverse to said longitudinal direction passing through said rider and said fitting.
11. The device according to claim 1 wherein said riders are steel castings capable of withstanding an elevated temperature.
12. A device for carrying a charge and more particularly slabs, billets, ingots and the like in a furnace, said device com-prising:
- at least one skid pipe defining a longitudinal direction and a centerline running in said direction, said skid pipe being capable of carrying a cooling fluid flowing through said skid pipe;
- at least two riders capable of withstanding an elevated temperature arranged on said skid pipe, each such rider having two carrying surfaces capable of supporting said charge and running off-center substantially parallel to said centerline in the longitudinal direction thereof, neigh-boring carrying surfaces being laterally spaced relative to each other and running at least partially to the side of said skid pipe and each such rider also having two face ends, each such face end having a first part on the side of said carrying surface and a second part, each such second part protruding relative to the neighboring first part in said longitudinal direction, the protruding second part of one in a series of riders being opposite to the first part of the neighboring rider; and - at least two tilt stopping means connected with said skid pipe at least one of said riders extending below the top surface of said skid pipe and resting on said tilt stopping means so that at least one of said tilt stopping means is underneath each carrying surface.
- at least one skid pipe defining a longitudinal direction and a centerline running in said direction, said skid pipe being capable of carrying a cooling fluid flowing through said skid pipe;
- at least two riders capable of withstanding an elevated temperature arranged on said skid pipe, each such rider having two carrying surfaces capable of supporting said charge and running off-center substantially parallel to said centerline in the longitudinal direction thereof, neigh-boring carrying surfaces being laterally spaced relative to each other and running at least partially to the side of said skid pipe and each such rider also having two face ends, each such face end having a first part on the side of said carrying surface and a second part, each such second part protruding relative to the neighboring first part in said longitudinal direction, the protruding second part of one in a series of riders being opposite to the first part of the neighboring rider; and - at least two tilt stopping means connected with said skid pipe at least one of said riders extending below the top surface of said skid pipe and resting on said tilt stopping means so that at least one of said tilt stopping means is underneath each carrying surface.
13. The device according to claim 12 wherein at least one of said riders is provided with a surface inclined in a direction trans-verse to said longitudinal direction to one side of each carry-ing surface and each such inclined surface is provided with a cut-out in which a ceramic component is arranged,
14. The device according to claim 12 wherein said riders axe steel castings fit for elevated temperature service.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19924203595 DE4203595C2 (en) | 1992-02-10 | 1992-02-10 | Device for supporting feed material in a heating furnace |
| DEP4203595.3 | 1992-02-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2088850A1 true CA2088850A1 (en) | 1993-08-11 |
Family
ID=6451199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2088850 Abandoned CA2088850A1 (en) | 1992-02-10 | 1993-02-05 | Device for carrying a charge in a furnace |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2088850A1 (en) |
| DE (1) | DE4203595C2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4324421C2 (en) * | 1993-07-21 | 2002-06-06 | Loi Thermprocess Gmbh | Device for supporting heat treatment material in a heating furnace |
| DE4343675A1 (en) * | 1993-12-21 | 1995-06-22 | Italimpianti Deutschland Gmbh | Walking beam furnace |
| DE19710870A1 (en) * | 1997-03-15 | 1998-09-17 | Techint Italimpianti Deutschla | Walking beam furnace |
| DE102018129446B4 (en) * | 2018-11-22 | 2024-03-14 | Saint-Gobain Industriekeramik Rödental GmbH | Beam for beam conveyor furnace |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1255539A (en) * | 1969-07-16 | 1971-12-01 | British Iron Steel Research | Furnace skids and beams |
| DE2705745C2 (en) * | 1977-02-11 | 1985-02-14 | Ruhrgas Ag, 4300 Essen | Cooled support beam for heating furnaces |
| DE3434356C2 (en) * | 1984-09-19 | 1986-01-23 | Engels, Paul, 4030 Ratingen | Attachments for cooled support tubes in heating ovens |
| DE4002870A1 (en) * | 1990-02-01 | 1991-08-08 | Loi Ind Ofenanlagen | DEVICE FOR SUPPORTING HEAT TREATMENT IN A WARMING OVEN |
-
1992
- 1992-02-10 DE DE19924203595 patent/DE4203595C2/en not_active Expired - Lifetime
-
1993
- 1993-02-05 CA CA 2088850 patent/CA2088850A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE4203595C2 (en) | 2001-07-19 |
| DE4203595A1 (en) | 1993-08-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |