CA2298399A1 - Nozzle- and porous plug-extracting apparatus - Google Patents
Nozzle- and porous plug-extracting apparatus Download PDFInfo
- Publication number
- CA2298399A1 CA2298399A1 CA 2298399 CA2298399A CA2298399A1 CA 2298399 A1 CA2298399 A1 CA 2298399A1 CA 2298399 CA2298399 CA 2298399 CA 2298399 A CA2298399 A CA 2298399A CA 2298399 A1 CA2298399 A1 CA 2298399A1
- Authority
- CA
- Canada
- Prior art keywords
- nozzle
- ram
- ladle
- extractor
- jaws
- 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
-
- 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
- B22D41/56—Means for supporting, manipulating or changing a pouring-nozzle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
- B22D1/005—Injection assemblies therefor
-
- 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
- C21C5/46—Details or accessories
- C21C5/4653—Tapholes; Opening or plugging thereof
-
- 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
- F27D3/1527—Taphole forming equipment, e.g. boring machines, piercing tools
-
- 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
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/161—Introducing a fluid jet or current into the charge through a porous element
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
BACKGROUND OF THE INVENTION
This invention relates to an apparatus for extracting an insert from the bottom of a steel-making ladle . More part-icularly the invention relates to an apparatus which extracts both a porous plug and a nozzle from a ladle while the ladle is at normal operating temperature.
Steel is conventionally made in a ladle heated to a temp-erature at which the constituents of the steel become molten.
The constituents are mixed by gases which are introduced through a so-called "porous plug" into the ladle . Molten steel is drawn from the ladle through a nozzle at the bottom of the container.
The nozzle and porous plug are conventionally mounted within blocks formed of refractory material and the blocks extend through openings in the bottom of the ladle. Mortar is usually used to bind the nozzle and plug to the blocks.
After repeated use, a nozzle and a porous plug become eroded to a point where they are no longer useful. When the plug and nozzle are to be replaced, the mortar which binds them to the block must first be broken. The steps involved in breaking the mortar are difficult and time consuming. First the ladle must be emptied then cooled to ambient temperature.
The mortar must then be chipped away by means of a jack-hammer to separate the nozzle and plug from the block so that they can be removed and replaced.
The condition of the block and the refractory lining of the ladle is severely damaged at the time the nozzle and por-ous plug are being removed. The reason is that the thermal shock sustained by the refractory material as its temperature drops from operating to ambient temperature causes it to spall. The violent vibrations caused by the hammering action of the jack-hammer also causes spalling. Major repairs of the lining and the blocks are usually required before the ladle can be returned to service.
SUMMARY OF THE INVENTION
The extracting apparatus of the subject invention over-comes the problems described above . The nozzle and porous plug are removed smoothly by pneumatic means and not violently by a jack-hammer. Moreover they can be removed while the ladle is at operating temperature so that the refractory lining and blocks are not damaged by thermal shock.
Removal of the nozzle and porous plug at operating temp-erature gives rise to a significant savings in the cost of energy over the conventional practice of removal at ambient temperature. The conventional practice requires that the ladle be reheated to restore it to operating temperature after the
This invention relates to an apparatus for extracting an insert from the bottom of a steel-making ladle . More part-icularly the invention relates to an apparatus which extracts both a porous plug and a nozzle from a ladle while the ladle is at normal operating temperature.
Steel is conventionally made in a ladle heated to a temp-erature at which the constituents of the steel become molten.
The constituents are mixed by gases which are introduced through a so-called "porous plug" into the ladle . Molten steel is drawn from the ladle through a nozzle at the bottom of the container.
The nozzle and porous plug are conventionally mounted within blocks formed of refractory material and the blocks extend through openings in the bottom of the ladle. Mortar is usually used to bind the nozzle and plug to the blocks.
After repeated use, a nozzle and a porous plug become eroded to a point where they are no longer useful. When the plug and nozzle are to be replaced, the mortar which binds them to the block must first be broken. The steps involved in breaking the mortar are difficult and time consuming. First the ladle must be emptied then cooled to ambient temperature.
The mortar must then be chipped away by means of a jack-hammer to separate the nozzle and plug from the block so that they can be removed and replaced.
The condition of the block and the refractory lining of the ladle is severely damaged at the time the nozzle and por-ous plug are being removed. The reason is that the thermal shock sustained by the refractory material as its temperature drops from operating to ambient temperature causes it to spall. The violent vibrations caused by the hammering action of the jack-hammer also causes spalling. Major repairs of the lining and the blocks are usually required before the ladle can be returned to service.
SUMMARY OF THE INVENTION
The extracting apparatus of the subject invention over-comes the problems described above . The nozzle and porous plug are removed smoothly by pneumatic means and not violently by a jack-hammer. Moreover they can be removed while the ladle is at operating temperature so that the refractory lining and blocks are not damaged by thermal shock.
Removal of the nozzle and porous plug at operating temp-erature gives rise to a significant savings in the cost of energy over the conventional practice of removal at ambient temperature. The conventional practice requires that the ladle be reheated to restore it to operating temperature after the
2 nozzle and porous plug are removed. Considerable time and en-ergy ire required to accomplish that . No such time is lost nor energy expended according to the practice of the subject in-vention.
The subject extracting apparatus has a gripper for re-moving a porous plug and a nozzle-extractor for removing a nozzle. The two parts are interchangeable so that both a nozzle and plug may be extracted by the same apparatus.
DESCRIPTION OF THE DRAWINGS
The extracting apparatus of the invention is described in detail with reference to the accompanying drawings in which:
Figure 1 is an elevation of the extracting apparatus used to remove a nozzle in conjunction with a steel-making ladle and a dolly for supporting the apparatus;
Figure 2 is an enlarged elevation of the extracting apparatus used to remove a porous plug in conjunction with a steel-making ladle and a dolly;
Figure 3 is an enlarged end view of the gripper for extracting a nozzle, partly cut away, in conjunction with a ladle;
Figure 3A is an enlarged elevation of the forward end of the nozzle extractor;
Figure 4 is an enlarged elevation of the gripper for
The subject extracting apparatus has a gripper for re-moving a porous plug and a nozzle-extractor for removing a nozzle. The two parts are interchangeable so that both a nozzle and plug may be extracted by the same apparatus.
DESCRIPTION OF THE DRAWINGS
The extracting apparatus of the invention is described in detail with reference to the accompanying drawings in which:
Figure 1 is an elevation of the extracting apparatus used to remove a nozzle in conjunction with a steel-making ladle and a dolly for supporting the apparatus;
Figure 2 is an enlarged elevation of the extracting apparatus used to remove a porous plug in conjunction with a steel-making ladle and a dolly;
Figure 3 is an enlarged end view of the gripper for extracting a nozzle, partly cut away, in conjunction with a ladle;
Figure 3A is an enlarged elevation of the forward end of the nozzle extractor;
Figure 4 is an enlarged elevation of the gripper for
3 extraction of a porous plug, partly cut away, in conjunction with a ladle.
Figure 5 is an enlarged end view of the carriage il-lustrated in Figures 1 and 2;
Figure 6 is a plan view of the dolly for supporting the extracting apparatus;
Figures 7 and 8 are enlarged elevations of the gripper for extracting a nozzle;
Figures 9 and 10 are enlarged elevations of the gripper for extracting a porous plug; and Figure 11 is a perspective view of the gripper for ex-tracting a porous plug.
Like reference characters refer to like parts throughout the description of the drawings.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to Figures 1,2 and 3, the extracting ap-paratus of the invention, generally 10 is connected to a dolly 12. The apparatus is adjacent to a steel-making ladle 14 which has a porous plug 16 and a nozzle 18. The size of the plug and nozzle is exaggerated relative to the ladle for a better un-derstanding of the apparatus. In some drawings the plug is above the nozzle, for example in Figures 1 and 3 and in some the plug is below the nozzle, see for example Figures 2 and 4.
Figure 5 is an enlarged end view of the carriage il-lustrated in Figures 1 and 2;
Figure 6 is a plan view of the dolly for supporting the extracting apparatus;
Figures 7 and 8 are enlarged elevations of the gripper for extracting a nozzle;
Figures 9 and 10 are enlarged elevations of the gripper for extracting a porous plug; and Figure 11 is a perspective view of the gripper for ex-tracting a porous plug.
Like reference characters refer to like parts throughout the description of the drawings.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to Figures 1,2 and 3, the extracting ap-paratus of the invention, generally 10 is connected to a dolly 12. The apparatus is adjacent to a steel-making ladle 14 which has a porous plug 16 and a nozzle 18. The size of the plug and nozzle is exaggerated relative to the ladle for a better un-derstanding of the apparatus. In some drawings the plug is above the nozzle, for example in Figures 1 and 3 and in some the plug is below the nozzle, see for example Figures 2 and 4.
4 As is well known, gases used in the steel making oper-a.tion'are introduced into the molten steel through a pipe 20 (Figure 3) which extends from the exterior of the ladle and through the porous plug to the interior of the ladle. Molten steel in the interior of the ladle is extracted through the nozzle.
With reference to Figure 4, the interior of the ladle is lined with refractory material 22 and both plug and nozzle are mounted in blocks 24, 26 also formed of refractory material.
As is conventional the plug and nozzle are attached to the blocks by means of mortar or other binding agent to prevent leakage of the molten steel through the space between the blocks and the nozzle and plug.
With reference to Figures 1,2 and 6, the dolly has an up-right mast 30 which extends upwardly from a base in the form of a rectangular frame composed of parallel end members 32, 32a and side members 36, 36a. The frame is reinforced by par-allel intermediate members 34, 34a. The frame is mounted on castors 38.
The extracting apparatus is attached to a carriage 40 having wheels 42 which run along opposite sides of the lower flange 44 of an I beam 46. The I beam is attached to the mast by means of a cylinder 48 which is welded to one end of the I-beam. The cylinder is pivotally mounted in bushings formed in spaced ears 54, 56 and the ears are connected to a plate 58.
The plate is attached to the mast by means of bolts 60 which extend through apertures in the plate and in the mast. A num-ber of such apertures are formed in the mast so that the height of the beam can be varied.
An upper horizontal beam 62 is welded to the upper end of the mast and an ear 64 extends downward from the end of the beam for supporting a chain hoist as described below.
Preferably the components which make up the dolly are I-beams or channels formed of steel.
With reference to Figure 3 the nozzle-extracting ap-paratus of the invention includes a housing 70 within which an elongated rod or ram 72 is mounted. An actuator 74 such as a hydraulic or pneumatic cylinder is also mounted within the housing and the ram extends through the actuator and outwardly through an opening in the forward end of the housing. The act-uator causes the ram to advance toward the ladle and to with-draw from it in a direction coaxial with the longitudinal axis 72a-72a of the ram.
The ram is composed of two segments, a rear segment 72b within the housing and a forward segment 72c partly inside and partly outside the housing. The two segments are intercon-nected by means of a joint 76 composed of a vertical hub 78 and a~pair of horizontal pegs 80. The pegs extend outwardly from diametrically opposite sides of the hub and into openings in the two ram segments. The ram segments are maintained in the openings by means of cotter pins (not illustrated) which extend through apertures in the pegs and the rams. By removal of the cotter pins, the two ram segments may be disconnected from the joint.
A nozzle-extractor is pivotally mounted to the forward end of the ram. The extractor is in the form of a bar or pin 90 which pivots between first and second positions. In the first position illustrated in Figure 3A, the pin is horizontal and its longitudinal axis coincides with the longitudinal axis 72a-72a of the ram as extended. When the pin is in this pos-ition, it fits into the bore 92 of the nozzle 18 so as not to inhibit the advance and retraction of the ram within the bore.
In Figure 3 the pin is in the second position. In that position the pin is vertical and is adapted to contact the interior end wall 94 of the nozzle such that when the ram is withdrawn from the bore, the pin draws the nozzle from the ladle.
One end 90a of the pin is heavier than the other end and when ram 72 is horizontal, gravity will cause the heavier end to swing downward. As a result the pin will normally be in the second position. In that position, the pin may bind with the wall of the bore of the nozzle as it is being inserted through the bore of the ram. To hold the pin in the first position so that it can be inserted into the bore without binding, duck tape is wound around the pin and ram. If the pin is inserted quickly, the tape will hold the pin in the first position un-til the pin is beyond the interior end wall 94 of the nozzle.
The heat from the ladle will cause the tape to burn and when that happens, the pin will swing to the second position.
Other frangible material which will break in the heat from the ladle can be substituted for duck tape.
With reference to Figures 4 and 9-11, a gripper 100 is substituted for the forward ram segment 72c and the joint 76 of Figure 3 when the apparatus of the invention is used to extract porous plug 16. The gripper has a channel 101 having a peg 102 which fits into the opening in the rear segment 72b of the ram. The gripper may thus be attached to the ram in the same way as joint 76 of the nozzle extractor.
The gripper has a pair of j aws 104 , 106 pivotal ly mounted to ears 107 attached to the channel. A boss 108 is attached to each jaw and a second boss 110 is attached to each flange of the channel. A coil spring 112 interconnects each pair of bosses and serves to resiliently bias the jaws apart from each other .' With reference to Figures 9 and 10, an annular shoulder 114 is formed on the inside wall of housing 70. When the ram is withdrawn, the jaws come into contact with the shoulder and the jaws pivot toward each other. The shoulder accordingly serves to oppose the bias of the coil springs.
OPERATION
The steps involved in removing a nozzle using the ex-tracting apparatus include first~adjusting the height of beam 44 by means of a chain hoist (not illustrated) suspended from ear 64 of the upper beam. Bolts 60 are removed from the mast so that I beam 46 may move up and down relative to the mast.
The beam should support the extracting apparatus such that the ram is at the same level as the bore of the nozzle. When the apparatus is at the correct position, the bolts are inserted into the mast to hold the apparatus in position.
Forward ram segment 72c having nozzle-extracting pin 90 at its forward end is then attached to the ram and the pin is taped into the first position. The pin is advanced into the bore by means of actuator 74 until it is beyond the interior end wall 94 of the nozzle. The heat in the bore will cause the tape to burn away and the pin will rotate into the second pos-ition.
The ram is then withdrawn by means of the actuator. The pin will bear against the interior end wall 94 of the nozzle with sufficient force to cause the mortar which binds the nozzle to the block to fracture.
The force required to fracture the mortar is in the order of 10 tons. The actuator is capable of causing the pinto ap-ply a force of as much as 100 tons to the interior end wall so that there is ample force to fracture the mortar.
The nozzle can then be removed from the block and the dolly rolled away from the ladle. At this point, the hot used nozzle can then be removed from the extraction apparatus and discarded.
The steps involved in removing a porous plug using the extracting apparatus include most of the steps for removal of the nozzle. The forward segment 72c of the ram and joint 76 are removed and the gripper assembly is attached to the joint by insertion of pin 102 into the rear ram segment and securing it therein by means of a cotter pin or other means.
The ram is then extended sufficiently by means of the cy-linder until the jaws of the gripper are outside housing 70.
The dolly is positioned such that pipe 20 of the plug is be-tween the jaws of the gripper. The ram is then retracted by means of the actuator thereby bringing the shoulder 114 of the housing into contact with the jaws with resulting clamping of the jaws to the pipe.
Further withdrawal of the ram causes the bond between the plug and the block in which it is located to fracture . The plug can the be removed in a manner similar to removal of the nozzle.
At the time the nozzle and porous plug are being extract-ed, the ladle will be under continuous fire. There is no ne-cessity to allow it to cool during this time.
It will be understood of course that modifications can be made in the preferred embodiments illustrated and described herein without departing from the scope and purview of the invention as defined in the appended claims.
With reference to Figure 4, the interior of the ladle is lined with refractory material 22 and both plug and nozzle are mounted in blocks 24, 26 also formed of refractory material.
As is conventional the plug and nozzle are attached to the blocks by means of mortar or other binding agent to prevent leakage of the molten steel through the space between the blocks and the nozzle and plug.
With reference to Figures 1,2 and 6, the dolly has an up-right mast 30 which extends upwardly from a base in the form of a rectangular frame composed of parallel end members 32, 32a and side members 36, 36a. The frame is reinforced by par-allel intermediate members 34, 34a. The frame is mounted on castors 38.
The extracting apparatus is attached to a carriage 40 having wheels 42 which run along opposite sides of the lower flange 44 of an I beam 46. The I beam is attached to the mast by means of a cylinder 48 which is welded to one end of the I-beam. The cylinder is pivotally mounted in bushings formed in spaced ears 54, 56 and the ears are connected to a plate 58.
The plate is attached to the mast by means of bolts 60 which extend through apertures in the plate and in the mast. A num-ber of such apertures are formed in the mast so that the height of the beam can be varied.
An upper horizontal beam 62 is welded to the upper end of the mast and an ear 64 extends downward from the end of the beam for supporting a chain hoist as described below.
Preferably the components which make up the dolly are I-beams or channels formed of steel.
With reference to Figure 3 the nozzle-extracting ap-paratus of the invention includes a housing 70 within which an elongated rod or ram 72 is mounted. An actuator 74 such as a hydraulic or pneumatic cylinder is also mounted within the housing and the ram extends through the actuator and outwardly through an opening in the forward end of the housing. The act-uator causes the ram to advance toward the ladle and to with-draw from it in a direction coaxial with the longitudinal axis 72a-72a of the ram.
The ram is composed of two segments, a rear segment 72b within the housing and a forward segment 72c partly inside and partly outside the housing. The two segments are intercon-nected by means of a joint 76 composed of a vertical hub 78 and a~pair of horizontal pegs 80. The pegs extend outwardly from diametrically opposite sides of the hub and into openings in the two ram segments. The ram segments are maintained in the openings by means of cotter pins (not illustrated) which extend through apertures in the pegs and the rams. By removal of the cotter pins, the two ram segments may be disconnected from the joint.
A nozzle-extractor is pivotally mounted to the forward end of the ram. The extractor is in the form of a bar or pin 90 which pivots between first and second positions. In the first position illustrated in Figure 3A, the pin is horizontal and its longitudinal axis coincides with the longitudinal axis 72a-72a of the ram as extended. When the pin is in this pos-ition, it fits into the bore 92 of the nozzle 18 so as not to inhibit the advance and retraction of the ram within the bore.
In Figure 3 the pin is in the second position. In that position the pin is vertical and is adapted to contact the interior end wall 94 of the nozzle such that when the ram is withdrawn from the bore, the pin draws the nozzle from the ladle.
One end 90a of the pin is heavier than the other end and when ram 72 is horizontal, gravity will cause the heavier end to swing downward. As a result the pin will normally be in the second position. In that position, the pin may bind with the wall of the bore of the nozzle as it is being inserted through the bore of the ram. To hold the pin in the first position so that it can be inserted into the bore without binding, duck tape is wound around the pin and ram. If the pin is inserted quickly, the tape will hold the pin in the first position un-til the pin is beyond the interior end wall 94 of the nozzle.
The heat from the ladle will cause the tape to burn and when that happens, the pin will swing to the second position.
Other frangible material which will break in the heat from the ladle can be substituted for duck tape.
With reference to Figures 4 and 9-11, a gripper 100 is substituted for the forward ram segment 72c and the joint 76 of Figure 3 when the apparatus of the invention is used to extract porous plug 16. The gripper has a channel 101 having a peg 102 which fits into the opening in the rear segment 72b of the ram. The gripper may thus be attached to the ram in the same way as joint 76 of the nozzle extractor.
The gripper has a pair of j aws 104 , 106 pivotal ly mounted to ears 107 attached to the channel. A boss 108 is attached to each jaw and a second boss 110 is attached to each flange of the channel. A coil spring 112 interconnects each pair of bosses and serves to resiliently bias the jaws apart from each other .' With reference to Figures 9 and 10, an annular shoulder 114 is formed on the inside wall of housing 70. When the ram is withdrawn, the jaws come into contact with the shoulder and the jaws pivot toward each other. The shoulder accordingly serves to oppose the bias of the coil springs.
OPERATION
The steps involved in removing a nozzle using the ex-tracting apparatus include first~adjusting the height of beam 44 by means of a chain hoist (not illustrated) suspended from ear 64 of the upper beam. Bolts 60 are removed from the mast so that I beam 46 may move up and down relative to the mast.
The beam should support the extracting apparatus such that the ram is at the same level as the bore of the nozzle. When the apparatus is at the correct position, the bolts are inserted into the mast to hold the apparatus in position.
Forward ram segment 72c having nozzle-extracting pin 90 at its forward end is then attached to the ram and the pin is taped into the first position. The pin is advanced into the bore by means of actuator 74 until it is beyond the interior end wall 94 of the nozzle. The heat in the bore will cause the tape to burn away and the pin will rotate into the second pos-ition.
The ram is then withdrawn by means of the actuator. The pin will bear against the interior end wall 94 of the nozzle with sufficient force to cause the mortar which binds the nozzle to the block to fracture.
The force required to fracture the mortar is in the order of 10 tons. The actuator is capable of causing the pinto ap-ply a force of as much as 100 tons to the interior end wall so that there is ample force to fracture the mortar.
The nozzle can then be removed from the block and the dolly rolled away from the ladle. At this point, the hot used nozzle can then be removed from the extraction apparatus and discarded.
The steps involved in removing a porous plug using the extracting apparatus include most of the steps for removal of the nozzle. The forward segment 72c of the ram and joint 76 are removed and the gripper assembly is attached to the joint by insertion of pin 102 into the rear ram segment and securing it therein by means of a cotter pin or other means.
The ram is then extended sufficiently by means of the cy-linder until the jaws of the gripper are outside housing 70.
The dolly is positioned such that pipe 20 of the plug is be-tween the jaws of the gripper. The ram is then retracted by means of the actuator thereby bringing the shoulder 114 of the housing into contact with the jaws with resulting clamping of the jaws to the pipe.
Further withdrawal of the ram causes the bond between the plug and the block in which it is located to fracture . The plug can the be removed in a manner similar to removal of the nozzle.
At the time the nozzle and porous plug are being extract-ed, the ladle will be under continuous fire. There is no ne-cessity to allow it to cool during this time.
It will be understood of course that modifications can be made in the preferred embodiments illustrated and described herein without departing from the scope and purview of the invention as defined in the appended claims.
Claims (2)
1. Apparatus for extracting from a steel-making ladle a porous plug of the type having a pipe for introducing gases into said ladle, said apparatus comprising: a housing; a ram mounted within said housing; a gripper having a pair of jaws each mounted to a forward end of said ram and pivotal toward and away from each other; resilient means for biasing said jaws away from each other; means opposed to the bias of said resilient means for causing said jaws to pivot toward each other to grip said pipe; and an actuator for causing said ram to advance and to withdraw in a direction coaxial with the longitudinal axis of said ram such that when said jaws grip said pipe and said actuator is activated, said ram withdraws from said ladle with resulting extraction of said nozzle from said ladle.
2. Apparatus for extracting from a steel-making ladle a nozzle having a bore which extends between oppositely facing extending interior and exterior end walls and through which molten steel flows from the interior to the exterior of said ladle, said apparatus comprising: a housing; a ram mounted within said housing; an actuator for causing said ram to ad-vance and to withdraw in a direction coaxial with the long-itudinal axis of said ram; a nozzle-extractor mounted to a forward end of said ram and pivotal between first and second positions, said nozzle-extractor when in the first position being adapted to fit into said bore so as not to inhibit the advance and withdrawal of said ram within said bore, said nozzle-extractor when in the second position, being adapted to contact the interior end wall of said nozzle such that when said ram is withdrawn, said nozzle-extractor draws the nozzle from the ladle; and frangible means for securing said nozzle-extractor in the first position and breakable in the heat within said nozzle and ladle with resulting pivoting of said nozzle-extractor to the second position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2298399 CA2298399A1 (en) | 2000-02-16 | 2000-02-16 | Nozzle- and porous plug-extracting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2298399 CA2298399A1 (en) | 2000-02-16 | 2000-02-16 | Nozzle- and porous plug-extracting apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2298399A1 true CA2298399A1 (en) | 2001-08-16 |
Family
ID=4165308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2298399 Abandoned CA2298399A1 (en) | 2000-02-16 | 2000-02-16 | Nozzle- and porous plug-extracting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2298399A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103801685A (en) * | 2014-02-26 | 2014-05-21 | 北京首钢国际工程技术有限公司 | Steel ladle bottom blowing air block dismantling device and working method thereof |
| EP2783773A1 (en) * | 2013-03-28 | 2014-10-01 | SMS Siemag AG | Device and method for extracting a gas purging plug from the wall of a metallurgical container |
| CN114260267A (en) * | 2021-12-03 | 2022-04-01 | 中冶赛迪工程技术股份有限公司 | Cleaning device for steel tapping hole of molten steel container |
-
2000
- 2000-02-16 CA CA 2298399 patent/CA2298399A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2783773A1 (en) * | 2013-03-28 | 2014-10-01 | SMS Siemag AG | Device and method for extracting a gas purging plug from the wall of a metallurgical container |
| CN103801685A (en) * | 2014-02-26 | 2014-05-21 | 北京首钢国际工程技术有限公司 | Steel ladle bottom blowing air block dismantling device and working method thereof |
| CN114260267A (en) * | 2021-12-03 | 2022-04-01 | 中冶赛迪工程技术股份有限公司 | Cleaning device for steel tapping hole of molten steel container |
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