CA1153671A - Method of and apparatus for descaling hot strip steel - Google Patents
Method of and apparatus for descaling hot strip steelInfo
- Publication number
- CA1153671A CA1153671A CA000362435A CA362435A CA1153671A CA 1153671 A CA1153671 A CA 1153671A CA 000362435 A CA000362435 A CA 000362435A CA 362435 A CA362435 A CA 362435A CA 1153671 A CA1153671 A CA 1153671A
- Authority
- CA
- Canada
- Prior art keywords
- strip
- downstream
- scale
- jets
- enclosure
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A hot steel strip is displaced under longitudinal tension along a transport path from an upstream feed bridle to a down-stream feed bridle. The hot steel strip is stretch-bent adjacent the upstream feed bridle to free scale from the strip in an enclosure in which the freed scale is collected. Downstream of this enclosure high-pressure water jets in another enclosure are played on the strip to free and separate the remaining scale from the strip. This freed scale is also collected. The strip is then pinched between a pair of rollers downstream of the high-pressure water jets so as to drive all water from the surfaces of the strip, whereupon it passes through the downstream feed bridle.
A hot steel strip is displaced under longitudinal tension along a transport path from an upstream feed bridle to a down-stream feed bridle. The hot steel strip is stretch-bent adjacent the upstream feed bridle to free scale from the strip in an enclosure in which the freed scale is collected. Downstream of this enclosure high-pressure water jets in another enclosure are played on the strip to free and separate the remaining scale from the strip. This freed scale is also collected. The strip is then pinched between a pair of rollers downstream of the high-pressure water jets so as to drive all water from the surfaces of the strip, whereupon it passes through the downstream feed bridle.
Description
Field of the Invention The present invention relates to a method of and an apparatus for descaling hot strip steel. More particularly this invention concerns a system for descaling hot strip s-teel as it emerges from a hot-rolling string and before it is coiled up or surface-treated for distribution and sale.
Background of the Invention Stretch~bending, such as described in my United States patent 3,924,428, is frequently used for descaling hot strip steel.
As the strip steel is bent back and forth over the stretch-bending rollers the scale is mostly broken free. At such a stretch-bend-ing station it is therefore possible to collect enormous amounts of scale. The normal procedure is to follow up such a s-tretch-bending descaling operation with a pickling. In this manner relatively clean, scale-~ree strip steel is produced.
It has been suggested to eliminate the pickling- operation by various procedures which eliminate the residual scale on the strip steel and which remove the dust also. Any residual scale or dust left on the steel will adhere to the downstream feed bridle, normally two or more spaced rollers that are ariven-to advance the strip along its transport path. If scale or dust is left on the strip it will build up on this donwstream bridle, requiring periodic cleaning while at the same time roughening the roller surfaces so that they can slip on the steel stock.
The equipment for eliminating residual scale and dust is often relatively complex. It normally requires a massive hood and vacuum arrangement to surround the path downstream of the stretch-bending descaler. E'orming such a closed chamber around ` 1 ~
.: .- ' ~
'' ' ~ - `.
~ ~3~
the downstream equipment makes it difficult to monitor the opera-tions. Such an arrangement also normally is provided even in the old-fashioned pickling process, in order to prevent the pick-ling solution from being excessively fouled with particles and dust.
It has also been suggested to wash or rinse the dust and loose scale off the strip steel by means of a water bath or low-pressure spray. While such a procedure does lay the dust and carry off most of the loose scaIe, it nonetheless is relative-ly ineffective against the still attached scale. Furthermore,thus wetting the band makes driving it by means of the downstream feed bridle relatively difficult as an aquaplaning effect takes place allowing considerable slippage between the bridle rollers and the strip steel.
Objects of the Invention It is therefore an object of the present invention to provide an improved descaling method and apparatus for hot strip steel.
Another object is -to provide such a method which over-comes the above-given disadvantages, producing in a relatively simple manner a clean dust-and-scale-free steel strip.
- Summary of the Invention These objects are attained according to the instant invention in an arranyement wherein, after the hot steel strip has been stretch-bent to free scale from it and this freed scale has been collected, high-pressure water jets are played on the strip downstream of the stretch-bending s-tation to separate the remaining scale from the strip, this remaining scale being .
6~
collected a-t the spray-descaling station. The strip is then passed through the nip between a pair of pinch-drying rollers which drive all of the surface water from the strip. Thence the strip can pass through the downstream feed bridle.
The me-thod and apparatus according to the invention thus ensure that the high-pressure wa-ter streams, working with water pressures of at least 100 a-tmospheres, strip the remaining scale from the strip. The use of such high-pressure streams directly in the stretch-bending descaler has been found completely ineffec-tive, since one of the purposes of such a stretch-bender is to level the steel strip. According to this invention the spray de-scaling takes place in a separate enclosure from the stretch bending so that the strip remains perfectly planar.
As a result of the near perfect planarity of the strip the pinch rollers that follow the spray descaler are able to drive virtually all of the water from the strip. Residual heat in the strip will ensure its complete drying before it enters the down-stream bridle. Thus any aquaplaning effect is completely out of the question. Further treatment of the thus leveled and descaled strip is relatively easy. The strip can, for example, be fed to a subsequent pickling and galvanizing step with ease since the leveled and descaled strip is relatively easy to handIe.
According to further features of this invéntion the jets that emit the descaling water streams are provided above and below the strips and in sets spaced above and below the path the strip follows. These jets can be mounted on beams extending horizontally perpendicular to the displacement direction of the strip and themselves set up so that they can oscillate and thereby ~1~3~
movably play their water streams over the surfaces of the strips, Provided between these sets of jets are support rollers on which the strip rides, so that it remains perfectly positioned between the jets. These support rollers further ensure that the planarity of the still relatively hot strip is maintained. It is necessary to maintain this planarity in order to ensure efficient operation of the downstream pinch-drying rollers.
The pinch-drying rollers may according to the instant invention be contained in a second downstream enclosure largely lQ separate from the downstream enclosure surrounding the jets. This downstream enclosure has intake and outle-t slots through which the strip passes and is provided with elastic lips at these slots to prevent leakage between the enclosures and to strip part of the water off the strip.
According to this invention all of the enclosures have inclined floors along which water sprays may be directed to drive the freed scale to the lower floor end where a drain is provided.
The upstream enclosure can be constituted at least in part as an exhaust hood and provided with an exhaust blower that carries off air from the enclosure and airborne scale. A cyclone or the like downstream of the blower can separate out these air-borne particles for recovery. Such a procedure is preferred to using a fine spray in the upstream enclosure to lay the dust.
The system according to the instant invention ensures a good prelimlnary descaling of the strip before it enters the downstream feed-roller bridle. Any loose particles left on the strip after leaving the stretch bender are removed in the subse-quent water descaler by the high-pressure water. Thus any build-,.J
.
i3~
up of scale on the downstream bridle rollers is impossible. ,Thestretch bender itself operates dry so that it will have a long service life. A pickling operation following the apparatus according to this inven-tion is not going to be subjected to any substantial dust buildup, as the strip will enter such a pickling operation relatively clean. Thus acid consumption is reduced.
As a result it is possible to operate with substantially higher conveyor speed so as to increase the overall processing speed and efficiency.
Description of the Drawing FIG. 1 is a side partly sectional and schematic view of the apparatus for carrying out the method of this invention; and FIG, 2 is a similar view showing an alternative arrange-ment according to this invention.
Specific Description As seen in FIG. 1 a hot steel strip 5 straight from a production facility is displaced in a transport direction D from an upstream feed bridle 2 having bridle rollers 2a to a down-stream feed bridle 3 having bridle rollers 3a. The rollers 2a, like the rollers 3a, are driven positively by a motor 21 and are spaced from each other by a distance substantially greater than the thickness of the strip 5 so that they do not pinch this strip Immediately downstream of the upstream feed bridle 2 is a stretch-bender 1 having a plurality of stretch-bending roliers la within an enclosureor chamber 4. This chamber 4 has a roof 16 formed as a hood connected to an exhaust blower 17 and an inclined floor 18 terminating at i-ts lower end at a drain 19 provided with ~ .
.
a gate valve 20. ~ater jets 7a are directed downwardly parallel to the sloping floor 18 to wash scale freed from the strip 5 by the rollers la down to the drain 19 whence it can pass out through the valve 20 into a collec-ting cart 27. Thus in this stretch-bender 1 much of the scale on the strip 5 will be removed and either sucked out by the blower 17 as airborne particles or collected in the wa-ter a-t the bottom of the enclosure 4. Further details about stretch-bending and drive arrangements can be seen in my earlier United States patents 3,777,532 and 3,924,428.
Immedi'ately downstream of the enclosure 4 as seen in FIG. 1 is another enclosure 6 provided internally with two longitudinally spaced pairs of idler-type support rollers 12 and four sets of descaling sprayers 7_ directed generally opposite to the direction D at the strip 5. These jets 7_ are supplied with water at at least 100 atmospheres. They are mounted on water-feed beams ll which may be oscillated by means of a motor 22 driving a wheel 23 having an eccentric 24 connected via a link 25 to an arm 26 extending from each beam 11. Thus as the motor 22 rotates the wheel 23 each beam 11 will be pivot-ed about its axis which extends horizontally perpendicular to the - direction D on the respective side of the strip 5. Two sets of sprays 7_ are provided between the two pairs of support rollers 12 and a further pair of sets is provided immediately downstream of these rollers 12.
The compartment 6 has a floor 14 at whose lower end is provided a drain 15 and at whose upper end is provided a sprayer 7c that washes particles down the'floor'14 toward the drain 15.
In addition the compartment or chamber 6 is provided at its up-stream and downstream ends with slots 28 through which the strip 5 passes and provided with elastic lips or skirts 13 that prevent water from the jets 7_ from spraying out of the enclosure 6.
The support rollers 12 ensure that the leveled and partially descaled strip 5 will remain perfectly planar and posi-tioned between the jets 7_ whlch cool it substantially. These jets 7_ will wash virtually all of the remaining scale as particles from -the surfaces of the strip 5 so that these particles can be collected in a water slurry at the drain 15.
FIG. 1 shows how two pairs of idler-type pinch rollers 8 are provided in the chambers 6 downstream of the furthest down-stream jets 7b. These rollers 8 are perfectly cylindrical and define nips that pinch the strip 5. Since the strip 5 is almost perfectly descaled by the time it reaches the rollers 8 and is nearly perfectly planar, these rollers 8 can drive virtually all oE the liquid from the surfaces of the strip 5. Thus when the strip 5 exits from the.downstream slot 28 it will be almost per-fectly dry. The rollers 8 are themselves not driven, like the rollers 12, but instead are rotated by engagement with the strip FIG. 2 shows how a partition 9 having a slot 29 in line with the slots 28 can form a downstream compartment 10 containing the drying rollers 8. This slot 29 is provided with elastic lips 13 like the slots 28 to prevent any spray from entering the chamber 10 directly. A second drain 15' is provided in the floor 18 upstream of the partition 9 to allow it to drain.
On leaving the downstream slot 28 the belt is almost perfectly dry and passes through -the bridle 3 to a subsequent operation, such as a pickling tank. The treatment accordiny to the instant invention can operate relatively rapidly, as the stretch-bending rollers la operate dry and the strip 5 issues from the apparatus perfectly dry. Buildup of particles on the downstream feed rollers 3a is impossible, since the strip 5 is free of particles by the time it engages these rollers 3a.
,
Background of the Invention Stretch~bending, such as described in my United States patent 3,924,428, is frequently used for descaling hot strip steel.
As the strip steel is bent back and forth over the stretch-bending rollers the scale is mostly broken free. At such a stretch-bend-ing station it is therefore possible to collect enormous amounts of scale. The normal procedure is to follow up such a s-tretch-bending descaling operation with a pickling. In this manner relatively clean, scale-~ree strip steel is produced.
It has been suggested to eliminate the pickling- operation by various procedures which eliminate the residual scale on the strip steel and which remove the dust also. Any residual scale or dust left on the steel will adhere to the downstream feed bridle, normally two or more spaced rollers that are ariven-to advance the strip along its transport path. If scale or dust is left on the strip it will build up on this donwstream bridle, requiring periodic cleaning while at the same time roughening the roller surfaces so that they can slip on the steel stock.
The equipment for eliminating residual scale and dust is often relatively complex. It normally requires a massive hood and vacuum arrangement to surround the path downstream of the stretch-bending descaler. E'orming such a closed chamber around ` 1 ~
.: .- ' ~
'' ' ~ - `.
~ ~3~
the downstream equipment makes it difficult to monitor the opera-tions. Such an arrangement also normally is provided even in the old-fashioned pickling process, in order to prevent the pick-ling solution from being excessively fouled with particles and dust.
It has also been suggested to wash or rinse the dust and loose scale off the strip steel by means of a water bath or low-pressure spray. While such a procedure does lay the dust and carry off most of the loose scaIe, it nonetheless is relative-ly ineffective against the still attached scale. Furthermore,thus wetting the band makes driving it by means of the downstream feed bridle relatively difficult as an aquaplaning effect takes place allowing considerable slippage between the bridle rollers and the strip steel.
Objects of the Invention It is therefore an object of the present invention to provide an improved descaling method and apparatus for hot strip steel.
Another object is -to provide such a method which over-comes the above-given disadvantages, producing in a relatively simple manner a clean dust-and-scale-free steel strip.
- Summary of the Invention These objects are attained according to the instant invention in an arranyement wherein, after the hot steel strip has been stretch-bent to free scale from it and this freed scale has been collected, high-pressure water jets are played on the strip downstream of the stretch-bending s-tation to separate the remaining scale from the strip, this remaining scale being .
6~
collected a-t the spray-descaling station. The strip is then passed through the nip between a pair of pinch-drying rollers which drive all of the surface water from the strip. Thence the strip can pass through the downstream feed bridle.
The me-thod and apparatus according to the invention thus ensure that the high-pressure wa-ter streams, working with water pressures of at least 100 a-tmospheres, strip the remaining scale from the strip. The use of such high-pressure streams directly in the stretch-bending descaler has been found completely ineffec-tive, since one of the purposes of such a stretch-bender is to level the steel strip. According to this invention the spray de-scaling takes place in a separate enclosure from the stretch bending so that the strip remains perfectly planar.
As a result of the near perfect planarity of the strip the pinch rollers that follow the spray descaler are able to drive virtually all of the water from the strip. Residual heat in the strip will ensure its complete drying before it enters the down-stream bridle. Thus any aquaplaning effect is completely out of the question. Further treatment of the thus leveled and descaled strip is relatively easy. The strip can, for example, be fed to a subsequent pickling and galvanizing step with ease since the leveled and descaled strip is relatively easy to handIe.
According to further features of this invéntion the jets that emit the descaling water streams are provided above and below the strips and in sets spaced above and below the path the strip follows. These jets can be mounted on beams extending horizontally perpendicular to the displacement direction of the strip and themselves set up so that they can oscillate and thereby ~1~3~
movably play their water streams over the surfaces of the strips, Provided between these sets of jets are support rollers on which the strip rides, so that it remains perfectly positioned between the jets. These support rollers further ensure that the planarity of the still relatively hot strip is maintained. It is necessary to maintain this planarity in order to ensure efficient operation of the downstream pinch-drying rollers.
The pinch-drying rollers may according to the instant invention be contained in a second downstream enclosure largely lQ separate from the downstream enclosure surrounding the jets. This downstream enclosure has intake and outle-t slots through which the strip passes and is provided with elastic lips at these slots to prevent leakage between the enclosures and to strip part of the water off the strip.
According to this invention all of the enclosures have inclined floors along which water sprays may be directed to drive the freed scale to the lower floor end where a drain is provided.
The upstream enclosure can be constituted at least in part as an exhaust hood and provided with an exhaust blower that carries off air from the enclosure and airborne scale. A cyclone or the like downstream of the blower can separate out these air-borne particles for recovery. Such a procedure is preferred to using a fine spray in the upstream enclosure to lay the dust.
The system according to the instant invention ensures a good prelimlnary descaling of the strip before it enters the downstream feed-roller bridle. Any loose particles left on the strip after leaving the stretch bender are removed in the subse-quent water descaler by the high-pressure water. Thus any build-,.J
.
i3~
up of scale on the downstream bridle rollers is impossible. ,Thestretch bender itself operates dry so that it will have a long service life. A pickling operation following the apparatus according to this inven-tion is not going to be subjected to any substantial dust buildup, as the strip will enter such a pickling operation relatively clean. Thus acid consumption is reduced.
As a result it is possible to operate with substantially higher conveyor speed so as to increase the overall processing speed and efficiency.
Description of the Drawing FIG. 1 is a side partly sectional and schematic view of the apparatus for carrying out the method of this invention; and FIG, 2 is a similar view showing an alternative arrange-ment according to this invention.
Specific Description As seen in FIG. 1 a hot steel strip 5 straight from a production facility is displaced in a transport direction D from an upstream feed bridle 2 having bridle rollers 2a to a down-stream feed bridle 3 having bridle rollers 3a. The rollers 2a, like the rollers 3a, are driven positively by a motor 21 and are spaced from each other by a distance substantially greater than the thickness of the strip 5 so that they do not pinch this strip Immediately downstream of the upstream feed bridle 2 is a stretch-bender 1 having a plurality of stretch-bending roliers la within an enclosureor chamber 4. This chamber 4 has a roof 16 formed as a hood connected to an exhaust blower 17 and an inclined floor 18 terminating at i-ts lower end at a drain 19 provided with ~ .
.
a gate valve 20. ~ater jets 7a are directed downwardly parallel to the sloping floor 18 to wash scale freed from the strip 5 by the rollers la down to the drain 19 whence it can pass out through the valve 20 into a collec-ting cart 27. Thus in this stretch-bender 1 much of the scale on the strip 5 will be removed and either sucked out by the blower 17 as airborne particles or collected in the wa-ter a-t the bottom of the enclosure 4. Further details about stretch-bending and drive arrangements can be seen in my earlier United States patents 3,777,532 and 3,924,428.
Immedi'ately downstream of the enclosure 4 as seen in FIG. 1 is another enclosure 6 provided internally with two longitudinally spaced pairs of idler-type support rollers 12 and four sets of descaling sprayers 7_ directed generally opposite to the direction D at the strip 5. These jets 7_ are supplied with water at at least 100 atmospheres. They are mounted on water-feed beams ll which may be oscillated by means of a motor 22 driving a wheel 23 having an eccentric 24 connected via a link 25 to an arm 26 extending from each beam 11. Thus as the motor 22 rotates the wheel 23 each beam 11 will be pivot-ed about its axis which extends horizontally perpendicular to the - direction D on the respective side of the strip 5. Two sets of sprays 7_ are provided between the two pairs of support rollers 12 and a further pair of sets is provided immediately downstream of these rollers 12.
The compartment 6 has a floor 14 at whose lower end is provided a drain 15 and at whose upper end is provided a sprayer 7c that washes particles down the'floor'14 toward the drain 15.
In addition the compartment or chamber 6 is provided at its up-stream and downstream ends with slots 28 through which the strip 5 passes and provided with elastic lips or skirts 13 that prevent water from the jets 7_ from spraying out of the enclosure 6.
The support rollers 12 ensure that the leveled and partially descaled strip 5 will remain perfectly planar and posi-tioned between the jets 7_ whlch cool it substantially. These jets 7_ will wash virtually all of the remaining scale as particles from -the surfaces of the strip 5 so that these particles can be collected in a water slurry at the drain 15.
FIG. 1 shows how two pairs of idler-type pinch rollers 8 are provided in the chambers 6 downstream of the furthest down-stream jets 7b. These rollers 8 are perfectly cylindrical and define nips that pinch the strip 5. Since the strip 5 is almost perfectly descaled by the time it reaches the rollers 8 and is nearly perfectly planar, these rollers 8 can drive virtually all oE the liquid from the surfaces of the strip 5. Thus when the strip 5 exits from the.downstream slot 28 it will be almost per-fectly dry. The rollers 8 are themselves not driven, like the rollers 12, but instead are rotated by engagement with the strip FIG. 2 shows how a partition 9 having a slot 29 in line with the slots 28 can form a downstream compartment 10 containing the drying rollers 8. This slot 29 is provided with elastic lips 13 like the slots 28 to prevent any spray from entering the chamber 10 directly. A second drain 15' is provided in the floor 18 upstream of the partition 9 to allow it to drain.
On leaving the downstream slot 28 the belt is almost perfectly dry and passes through -the bridle 3 to a subsequent operation, such as a pickling tank. The treatment accordiny to the instant invention can operate relatively rapidly, as the stretch-bending rollers la operate dry and the strip 5 issues from the apparatus perfectly dry. Buildup of particles on the downstream feed rollers 3a is impossible, since the strip 5 is free of particles by the time it engages these rollers 3a.
,
Claims (15)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of descaling a hot steel strip comprising the steps of:
displacing said hot steel strip under longitudinal tension along a transport path from an upstream to a downstream feed location;
stretch-bending said hot steel strip at a stretch-bending station between said locations to free scale from said strip;
collecting the freed scale at said stretch-bending station;
playing high-pressure water jets on said strip at a spray-descaling station between said stretch-bending station and said downstream location to free and separate the remaining scale from said strip;
collecting the freed scale also at said spray-descaling station; and pinching said strip between a pair of drying rollers at a drying station between said spray-descaling station and said downstream location to drive water from said strip.
displacing said hot steel strip under longitudinal tension along a transport path from an upstream to a downstream feed location;
stretch-bending said hot steel strip at a stretch-bending station between said locations to free scale from said strip;
collecting the freed scale at said stretch-bending station;
playing high-pressure water jets on said strip at a spray-descaling station between said stretch-bending station and said downstream location to free and separate the remaining scale from said strip;
collecting the freed scale also at said spray-descaling station; and pinching said strip between a pair of drying rollers at a drying station between said spray-descaling station and said downstream location to drive water from said strip.
2. The method defined in claim 1 wherein said strip is dis-placed along said path by being engaged over drive bridles each including at least two bridle rollers spaced radially apart by a distance substantially greater than the thickness of said strip at said locations.
3. The method defined in claim 2, further comprising the step of isolating said pinch rollers in a separate compartment from said jets.
4. The method defined in claim 2 wherein said pinch rollers idle and are rotationally driven by said strip, said pinch rollers defining a nip of substantially the same width as the thickness of said strip.
5. The method defined in claim 1 wherein said water jets have a pressure of at least 100 atmospheres.
6. An apparatus for descaling a hot steel strip, said apparatus comprising:
feed means including upstream and downstream bridle-roller pairs for displacing said strip under longitudinal tension along a transport path from said upstream to said donwstream bridle-roller pairs;
means including staggered stretch-bending rollers along said path downstream of said upstream bridle-roller pair for stretch-bending said hot steel strip to free scale from said strip;
means including an upstream enclosure surrounding said path and stretch-bending rollers for collecting the freed scale;
a plurality of high-pressure water jets directed at said strip downstream of said enclosure;
means for feeding water under high pressure to said jets to play water streams from said jets on said strip and thereby free the remaining scale from said strip;
means including a downstream enclosure for collecting the freed scale also at said jets; and a pair of pinch rollers defining a strip-pinching nip between said jets and said downstream bridle-roller pair for physically driving water from said strip before entry of same into said downstream roller pair.
feed means including upstream and downstream bridle-roller pairs for displacing said strip under longitudinal tension along a transport path from said upstream to said donwstream bridle-roller pairs;
means including staggered stretch-bending rollers along said path downstream of said upstream bridle-roller pair for stretch-bending said hot steel strip to free scale from said strip;
means including an upstream enclosure surrounding said path and stretch-bending rollers for collecting the freed scale;
a plurality of high-pressure water jets directed at said strip downstream of said enclosure;
means for feeding water under high pressure to said jets to play water streams from said jets on said strip and thereby free the remaining scale from said strip;
means including a downstream enclosure for collecting the freed scale also at said jets; and a pair of pinch rollers defining a strip-pinching nip between said jets and said downstream bridle-roller pair for physically driving water from said strip before entry of same into said downstream roller pair.
7. The apparatus defined in claim 6, further comprising a second downstream enclosure between the first-mentioned down-stream enclosure and said downstream bridle-roller pair and surrounding said pinch rollers.
8. The apparatus defined in claim 7 wherein said second downstream enclosure is formed with an upstream inlet slot and a downstream outlet slot through which said strip passes and is provided at least at said upstream slot with elastic lips elastic-ally engaging said strip and partially stripping water therefrom.
9. The apparatus defined in claim 6 wherein said jets are provided above and below said strip and are directed generally oppositely to the travel direction of said strip along said path.
10. The apparatus defined in claim 9, further comprising means for oscillating said jets while directing same at said strip.
11. The apparatus defined in claim 6 wherein several sets of said jets are spaced along said path, said apparatus further comprising support rollers engaging said strip between said sets-of jets.
12. The apparatus defined in claim 6 wherein said down-stream enclosure has a downwardly tilted floor having a lower end provided with a drain, said apparatus further comprising a spray directing rinse water downwardly along said floor to wash said scale into said drain.
13. The apparatus defined in claim 6 wherein said upstream enclosure is formed as a draft hood and is provided with an exhaust blower for withdrawing air and airborne scale from said upstream enclosure.
14. The apparatus defined in claim 13 wherein said upstream enclosure has a floor provided with a drain and a gate openable for withdrawing coarse scale from said upstream enclosure.
15. The apparatus defined in claim 13, further comprising a water spray for washing said coarse scale into said drain.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2942270.6-14 | 1979-10-19 | ||
| DE19792942270 DE2942270C2 (en) | 1979-10-19 | 1979-10-19 | Descaling plant for descaling hot strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1153671A true CA1153671A (en) | 1983-09-13 |
Family
ID=6083847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000362435A Expired CA1153671A (en) | 1979-10-19 | 1980-10-15 | Method of and apparatus for descaling hot strip steel |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1153671A (en) |
| DE (1) | DE2942270C2 (en) |
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| CN110038912A (en) * | 2018-01-17 | 2019-07-23 | 宝山钢铁股份有限公司 | De-scaling water collecting device on a kind of milling train |
| CN112170350A (en) * | 2020-10-16 | 2021-01-05 | 四川汇源钢建科技股份有限公司 | Metal surface washing and cleaning device and cleaning method thereof |
| CN116967301A (en) * | 2023-09-22 | 2023-10-31 | 金鼎重工有限公司 | Dephosphorization machine for H-shaped steel rolling |
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| DE4123956C2 (en) * | 1991-07-19 | 1994-07-21 | Thyssen Stahl Ag | Process and plant for producing a metal strand by casting |
| DE4423664A1 (en) * | 1994-07-07 | 1996-05-15 | Bwg Bergwerk Walzwerk | Process for producing cold-rolled steel strips from stainless steel and metal strips, in particular from titanium alloys |
| WO1997011798A1 (en) * | 1995-09-26 | 1997-04-03 | Hermetik Hydraulik Ab | Process for cold descaling |
| DE10155122B4 (en) * | 2001-11-09 | 2010-07-29 | Sms Siemag Aktiengesellschaft | Method and device for stretch-bending straightening of metal strip, in particular hot or cold rolled steel strip |
| DE102012103366A1 (en) | 2012-04-18 | 2013-10-24 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Method and apparatus for crushing a scale-damaged metal strip |
| CN103831731B (en) * | 2014-03-10 | 2016-01-13 | 浙江金润环保设备有限公司 | Sand blasting apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2391499A (en) * | 1941-06-25 | 1945-12-25 | Bertha L Yoder | Process of and apparatus for operating on sheet metal |
| DE2350503B1 (en) * | 1973-10-08 | 1975-01-23 | Bwg Bergwerk Walzwerk | Method and device for descaling and leveling sheet metal strips |
| JPS54161189A (en) * | 1978-06-09 | 1979-12-20 | Ishikawajima Harima Heavy Ind Co Ltd | Fluid injection device |
-
1979
- 1979-10-19 DE DE19792942270 patent/DE2942270C2/en not_active Expired
-
1980
- 1980-10-15 CA CA000362435A patent/CA1153671A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110038912A (en) * | 2018-01-17 | 2019-07-23 | 宝山钢铁股份有限公司 | De-scaling water collecting device on a kind of milling train |
| CN112170350A (en) * | 2020-10-16 | 2021-01-05 | 四川汇源钢建科技股份有限公司 | Metal surface washing and cleaning device and cleaning method thereof |
| CN116967301A (en) * | 2023-09-22 | 2023-10-31 | 金鼎重工有限公司 | Dephosphorization machine for H-shaped steel rolling |
| CN116967301B (en) * | 2023-09-22 | 2023-12-05 | 金鼎重工有限公司 | Dephosphorization machine for H-shaped steel rolling |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2942270C2 (en) | 1984-05-17 |
| DE2942270A1 (en) | 1981-04-30 |
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