CA1074112A - Clay gun for a shaft furnace - Google Patents
Clay gun for a shaft furnaceInfo
- Publication number
- CA1074112A CA1074112A CA257,165A CA257165A CA1074112A CA 1074112 A CA1074112 A CA 1074112A CA 257165 A CA257165 A CA 257165A CA 1074112 A CA1074112 A CA 1074112A
- Authority
- CA
- Canada
- Prior art keywords
- clay
- chamber
- gun
- segments
- piece
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Blast Furnaces (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Reciprocating Pumps (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In order to give easy access to the ejector piston of a clay gun for plugging the taphole of a shaft furnace and enabling the piston segments to be removed and replaced wihout loss of time a conical piece which can be withdrawn from the clay chamber is so construded that the ejector piston, in the completely disengaged position, at least partly penetrates the said conical piece.
In order to give easy access to the ejector piston of a clay gun for plugging the taphole of a shaft furnace and enabling the piston segments to be removed and replaced wihout loss of time a conical piece which can be withdrawn from the clay chamber is so construded that the ejector piston, in the completely disengaged position, at least partly penetrates the said conical piece.
Description
IMPROVEMENTS IN AND RELATING TO A CLAY GUN FOR A SH~FT
FURNACE
The present invention relates to a clay gun for plugging the tapholes of a shaft furnace, particularly a blast furnace with high counter-pressure.
It is known that the tapholes of a shaft furnaee 9 particularly of a blast furnace, are plugged with a sealing compound, generally consisting of clay and applied at a high pressure by means of a clay gun. This clay gun comprises a clay chamber and an ejector piston which slides therein in order to expel the clay through the nose of the gun into the taphole. The high counter-pressure of modern blast furnaces and the eonsistence of the sealing compound now employed neces-sitate very high pressures for sealing the tapholes, this being one of the reasons why the ejector pis-ton of modern clay guns is practically always operated by means of a hydraulie jack.
Owing to the high operating pressure~ of modern clay guns, whieh tend to be increased still further, particular care has to be devoted to the construetion of the segments of the ejeetor piston whieh slides in the elay chamber. The faet is that the segments of this piston have to be capable of preven-ting clay from finding ist way via the per~hery t~ the piston rod sida when the piston rod is operated for the purpose of ejecting the clay through the nose of the gun. Since these f~etions ean only be satisfactorily fulfilled if the segments are in faultless eonditions, and sinee, moreover, these segments are exposed to considerable strains during the operation of sealing up the pouring holes, they have to be removed and replaeed at regular intervals. Now for the segments of the ejeetor piston of a conventional clay gun to be rendered acees-sible the said chamber and the hydraulic jack have -to be diseonnected from eaeh other and the entire elay ehamber has to be dismantled9 ~3'~
The object of the present invention is to provide a new design for a clay chamber, giving easy access to the ejec-tor piston and enabling its segments to be removed and replaced without loss of time and without the neces9i-ty of detaching the entire clay chamber.
According to the present invention -there is provided a clay gun for plugging the taphole of a shaft furnace, having a clay chamber, said clay chamber being prolonged in the direction of the taphole by an intermediate conical piece and the nose of the gun9 and an ejector piston sliding in said clay chamber and fitted with segments, the improvement consisting in that the intermediate conical piece is so construc-ted that the ejector piston, in the completely disengaged position, at least partly penetrates the said intermediate piece~ which can be ~ithdr~n from the clay chamber.
~he invention will be understood more clearly from the description of one embodiment thereof, discussed solely by way of an example and by reference to the one single drawing attached, representing a longitudinal section through one end of a clay gun.
~he attached drawing shows the end of a clay gun 1, comprising a clay chamber 2 of which the outer wail 4 is prolonged by an intermediate conical piece 6 terminating in a nose 8 through which the clay contained in the chamber
FURNACE
The present invention relates to a clay gun for plugging the tapholes of a shaft furnace, particularly a blast furnace with high counter-pressure.
It is known that the tapholes of a shaft furnaee 9 particularly of a blast furnace, are plugged with a sealing compound, generally consisting of clay and applied at a high pressure by means of a clay gun. This clay gun comprises a clay chamber and an ejector piston which slides therein in order to expel the clay through the nose of the gun into the taphole. The high counter-pressure of modern blast furnaces and the eonsistence of the sealing compound now employed neces-sitate very high pressures for sealing the tapholes, this being one of the reasons why the ejector pis-ton of modern clay guns is practically always operated by means of a hydraulie jack.
Owing to the high operating pressure~ of modern clay guns, whieh tend to be increased still further, particular care has to be devoted to the construetion of the segments of the ejeetor piston whieh slides in the elay chamber. The faet is that the segments of this piston have to be capable of preven-ting clay from finding ist way via the per~hery t~ the piston rod sida when the piston rod is operated for the purpose of ejecting the clay through the nose of the gun. Since these f~etions ean only be satisfactorily fulfilled if the segments are in faultless eonditions, and sinee, moreover, these segments are exposed to considerable strains during the operation of sealing up the pouring holes, they have to be removed and replaeed at regular intervals. Now for the segments of the ejeetor piston of a conventional clay gun to be rendered acees-sible the said chamber and the hydraulic jack have -to be diseonnected from eaeh other and the entire elay ehamber has to be dismantled9 ~3'~
The object of the present invention is to provide a new design for a clay chamber, giving easy access to the ejec-tor piston and enabling its segments to be removed and replaced without loss of time and without the neces9i-ty of detaching the entire clay chamber.
According to the present invention -there is provided a clay gun for plugging the taphole of a shaft furnace, having a clay chamber, said clay chamber being prolonged in the direction of the taphole by an intermediate conical piece and the nose of the gun9 and an ejector piston sliding in said clay chamber and fitted with segments, the improvement consisting in that the intermediate conical piece is so construc-ted that the ejector piston, in the completely disengaged position, at least partly penetrates the said intermediate piece~ which can be ~ithdr~n from the clay chamber.
~he invention will be understood more clearly from the description of one embodiment thereof, discussed solely by way of an example and by reference to the one single drawing attached, representing a longitudinal section through one end of a clay gun.
~he attached drawing shows the end of a clay gun 1, comprising a clay chamber 2 of which the outer wail 4 is prolonged by an intermediate conical piece 6 terminating in a nose 8 through which the clay contained in the chamber
2 is expelled. ~his clay is detached at a very high~pressure by means of a piston 10 affixed to the end of Q piston rod 12 actuated by a hgdraulic jack, not shown in the drawing.
~he ejector piston 10, which is shown in this drawing in its completely disengaged position, is fitted with two segments 14 and 16 secured by means of nuts 20 between the body of the piston 10 and a securing ring 18. ~hese segments 14 and 16 prevent the clay from finding its way "upstream"
.. .
.. . . .
.. . ............. -. . ..... .. . . ......... . .... ..
, ~ ~7 ~
via the p~riphery o~ th~ pi3ton 10, to ~h~ ~id~ corr~ponding to the piston rod 12, when the piston 10 is operated in order to expel the clay through the nose 8 of the gun 1. The provision of these segments 14 and 16 is all the more justi-fied since modern clay guns operate at very high pressures, up to 200 kg/cm2 and even more. It is therefore essential, in view of these high pressures, to ensure that there is not the slightest gap left between the periphery of the piston 10 and the internal surface of the wall of the clay chamber By reason of this very high pressure, as well as the abrasive properties of the clay9 these segments 14 and 16 are subàected to considerable strain and therefore have - to be renewed and replaced fairly frequently.
In order to facilitate the replacement of the segments 14 and 16, particularly the operation ~ dismantling them, a securing system has been provided which involves a securing ring 18 and screws 20. The fact is that this system enables the segments 14 and 16 to be withdrawn by means of a trans-latory movement in the axial direction, so that the said ~ -segments 14 and 16 can be constructed in the form of completely closed rings. Owing~ however, to the operating conditions of the ejector piston 10, the segments 14 and 15 cannot be immediately withdrawn after simply releasing the nuts 20.
~or both the presence of the clay and the heat radiated short time on the entire surface of the ejector piston 10 and to extend into even the smallest interstices between the segments 14 and 16. The said segments14 and 16 therefore cannot be imm~iately detached9 even after the nuts 20 have been undone, and the outer surface of the segments has to - : ,
~he ejector piston 10, which is shown in this drawing in its completely disengaged position, is fitted with two segments 14 and 16 secured by means of nuts 20 between the body of the piston 10 and a securing ring 18. ~hese segments 14 and 16 prevent the clay from finding its way "upstream"
.. .
.. . . .
.. . ............. -. . ..... .. . . ......... . .... ..
, ~ ~7 ~
via the p~riphery o~ th~ pi3ton 10, to ~h~ ~id~ corr~ponding to the piston rod 12, when the piston 10 is operated in order to expel the clay through the nose 8 of the gun 1. The provision of these segments 14 and 16 is all the more justi-fied since modern clay guns operate at very high pressures, up to 200 kg/cm2 and even more. It is therefore essential, in view of these high pressures, to ensure that there is not the slightest gap left between the periphery of the piston 10 and the internal surface of the wall of the clay chamber By reason of this very high pressure, as well as the abrasive properties of the clay9 these segments 14 and 16 are subàected to considerable strain and therefore have - to be renewed and replaced fairly frequently.
In order to facilitate the replacement of the segments 14 and 16, particularly the operation ~ dismantling them, a securing system has been provided which involves a securing ring 18 and screws 20. The fact is that this system enables the segments 14 and 16 to be withdrawn by means of a trans-latory movement in the axial direction, so that the said ~ -segments 14 and 16 can be constructed in the form of completely closed rings. Owing~ however, to the operating conditions of the ejector piston 10, the segments 14 and 15 cannot be immediately withdrawn after simply releasing the nuts 20.
~or both the presence of the clay and the heat radiated short time on the entire surface of the ejector piston 10 and to extend into even the smallest interstices between the segments 14 and 16. The said segments14 and 16 therefore cannot be imm~iately detached9 even after the nuts 20 have been undone, and the outer surface of the segments has to - : ,
3'7~
be hammered, in order to unstick and release them. This naturally ne~essltates access ~n tha radia~ direction ~ the piston 10 and the segments 14 and 16, an object which) with the conventional clay guns~ can only be achieved by dismantling the entire cla~ chamber 2.
According to the present invention, the interm~iate conical piece 6 is provided with a cylindrical prolongation 22 which is coaxial with the wall 4 of the clay chamber 2 and detachable from the said wall 4. The length of the cylindrical part 22 is such that its internal surface extends at least over the entire width of the segments 14 and 16 when the ejector piston 10 is in its disengaged position, The inter-mediate piece 6 is firmly affixed by its cylindrical part 22 to the wall 4 of the clay chamber 2, by means of a collar 24.
The intermediate piece 6 and the nose 8 are preferably connec- i - ted to the cylindrical wall 4 by means of a hinge, so that after the movable collar 24 has been detached the assembly consisting of the nose 8, the intermediate piece 6 and the cylindrical part 2? can pivot about a vertical axis. The clay chamber Qan thus be completely opened and the entire front face of the ejector piston 10 disengaged when the said piston is in its most advanced position.
Thanks to the cylindrical part 22 of the intermediate piece 6, the segments 14 and 16, in the present invention, extend beyond the cylindrical wall 4 when the ejector piston 10 is in the disengaged position. This gives easy access all - around these segments and considerably facilitates -the opera-tion of replacing them.
It often happens that the ejector piston of a clay gun has to be replaced in its entiret~0 In such cases the advantages offered by the present invention become still more .
~'7~
evident, 3ince in the case of the segment~ -the ejector piston 10 can be replaced by opening the clay chamber 2 at the level of the intermediate piece 6 instead of dismantling the said clay chanlber completely. It should be noted that the ejector pis-ton is generally affixed to its rod by bolts, so that it can be detached therefrom.
Ihe access provided by the present invention between the intermediate piece 6 a~ the cylindrical wall 4 is also found highly advantageous when the clay chamber has to be cleaned For in this case easy access is a~forded not only to the cylindrical part of the clay chamber 2 but also to the interior of the conical portion of the intermediate piece 6.
In order to avoid jamming between the segments 14 and 16 and the cylindrical wall 4 when the piston 10 is being retracted, the internal face of the cylindrical wall 4 can be made slightly divergent at the end adjacent to the cylindri~
cal part 22, in order to assist the re-entry of the segments 14 a~d 16 into the cylindrical wall 4 during the retraction from the position shown in the drawing. Instead of adopting this divergent construction for the internal sur~ace of the cylindrical wall 4 it would be equally possible to give the segments rounded edges, particularly the segment 14 9 in order to enable them to engage the said cylindrical wall 4 more easily.
~eedless to say 9 the invention is not confined to an ejector piston comprising two segments and it is easily possible to provide either more than two or fewer than two segments. Similarly, the provisionof open and slightly elastic segments in place of closed segments would not go beyond the scope of the invention.
'
be hammered, in order to unstick and release them. This naturally ne~essltates access ~n tha radia~ direction ~ the piston 10 and the segments 14 and 16, an object which) with the conventional clay guns~ can only be achieved by dismantling the entire cla~ chamber 2.
According to the present invention, the interm~iate conical piece 6 is provided with a cylindrical prolongation 22 which is coaxial with the wall 4 of the clay chamber 2 and detachable from the said wall 4. The length of the cylindrical part 22 is such that its internal surface extends at least over the entire width of the segments 14 and 16 when the ejector piston 10 is in its disengaged position, The inter-mediate piece 6 is firmly affixed by its cylindrical part 22 to the wall 4 of the clay chamber 2, by means of a collar 24.
The intermediate piece 6 and the nose 8 are preferably connec- i - ted to the cylindrical wall 4 by means of a hinge, so that after the movable collar 24 has been detached the assembly consisting of the nose 8, the intermediate piece 6 and the cylindrical part 2? can pivot about a vertical axis. The clay chamber Qan thus be completely opened and the entire front face of the ejector piston 10 disengaged when the said piston is in its most advanced position.
Thanks to the cylindrical part 22 of the intermediate piece 6, the segments 14 and 16, in the present invention, extend beyond the cylindrical wall 4 when the ejector piston 10 is in the disengaged position. This gives easy access all - around these segments and considerably facilitates -the opera-tion of replacing them.
It often happens that the ejector piston of a clay gun has to be replaced in its entiret~0 In such cases the advantages offered by the present invention become still more .
~'7~
evident, 3ince in the case of the segment~ -the ejector piston 10 can be replaced by opening the clay chamber 2 at the level of the intermediate piece 6 instead of dismantling the said clay chanlber completely. It should be noted that the ejector pis-ton is generally affixed to its rod by bolts, so that it can be detached therefrom.
Ihe access provided by the present invention between the intermediate piece 6 a~ the cylindrical wall 4 is also found highly advantageous when the clay chamber has to be cleaned For in this case easy access is a~forded not only to the cylindrical part of the clay chamber 2 but also to the interior of the conical portion of the intermediate piece 6.
In order to avoid jamming between the segments 14 and 16 and the cylindrical wall 4 when the piston 10 is being retracted, the internal face of the cylindrical wall 4 can be made slightly divergent at the end adjacent to the cylindri~
cal part 22, in order to assist the re-entry of the segments 14 a~d 16 into the cylindrical wall 4 during the retraction from the position shown in the drawing. Instead of adopting this divergent construction for the internal sur~ace of the cylindrical wall 4 it would be equally possible to give the segments rounded edges, particularly the segment 14 9 in order to enable them to engage the said cylindrical wall 4 more easily.
~eedless to say 9 the invention is not confined to an ejector piston comprising two segments and it is easily possible to provide either more than two or fewer than two segments. Similarly, the provisionof open and slightly elastic segments in place of closed segments would not go beyond the scope of the invention.
'
Claims (8)
1. A clay gun for plugging the taphole of a shaft furnace including a clay chamber, said clay chamber being pro-longed in the direction of the taphole by an intermediate conical piece and the nose of the gun, and an ejector piston sliding in said clay chamber and fitted with segments, the improvement consisting in that the intermediate conical piece is so constructed that the ejector piston, in the completely disengaged position, at least partly penetrates the said intermediate piece, which can be withdrawn from the clay chamber.
2. A clay gun as claimed in claim 1, wherein the intermediate piece comprises a cylindrical portion which extends at least over the width of the segments of the ejector piston when the latter occupies its completely disengaged position.
3. A clay gun as claimed in claim 2, wherein the inter-mediate piece is detachably affixed to the clay chamber by means of a detachable collar.
4. A clay gun as claimed in claim 1, wherein the inter-mediate piece is detachably affixed to the clay chamber by means of a detachable collar.
5. A clay gun as claimed in claim 3, wherein the intermediate piece is hinged to the clay chamber and wherein the latter can be opened by dismantling the securing collar and turning over the assembly consisting of nose, intermediate piece and cylindrical portion.
6. A clay gun as claimed in any one of claims 1 to 3 wherein the ejector piston is provided with two closed annular segments affixed coaxially thereto by means of a securing ring and a set of nuts.
7. A clay gun as claimed in claim 2 or 3, wherein the clay chamber has a cylindrical wall and the end of the said cylindrical wall which is adjacent to the cylindrical portion of the intermediate piece is made slightly divergent.
8. A clay gun as claimed in claim 1 or 2, wherein the segments have rear external edges which are slightly rounded.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU73045A LU73045A1 (en) | 1975-07-24 | 1975-07-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1074112A true CA1074112A (en) | 1980-03-25 |
Family
ID=19728002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA257,165A Expired CA1074112A (en) | 1975-07-24 | 1976-07-16 | Clay gun for a shaft furnace |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5215506A (en) |
| AT (1) | AT355067B (en) |
| BE (1) | BE844427A (en) |
| CA (1) | CA1074112A (en) |
| DE (1) | DE2632554C3 (en) |
| FR (1) | FR2318932A1 (en) |
| GB (1) | GB1525304A (en) |
| IT (1) | IT1065061B (en) |
| LU (1) | LU73045A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1989799A (en) * | 1935-02-05 | Clay gun | ||
| US1889433A (en) * | 1932-11-29 | Mud gun | ||
| DE723343C (en) * | 1939-07-19 | 1942-08-03 | Dango & Dienenthal Kg | Tap hole tamping machine for blast furnaces or the like. |
| DE1219958B (en) * | 1963-11-16 | 1966-06-30 | Dango & Dienenthal Kommandit G | Hydraulic cylinder piston drive for the mass piston of a tap hole tamping machine |
-
1975
- 1975-07-24 LU LU73045A patent/LU73045A1/xx unknown
-
1976
- 1976-07-09 AT AT503776A patent/AT355067B/en not_active IP Right Cessation
- 1976-07-09 FR FR7621163A patent/FR2318932A1/en active Granted
- 1976-07-16 CA CA257,165A patent/CA1074112A/en not_active Expired
- 1976-07-20 DE DE19762632554 patent/DE2632554C3/en not_active Expired
- 1976-07-22 BE BE6045620A patent/BE844427A/en not_active IP Right Cessation
- 1976-07-22 GB GB3050976A patent/GB1525304A/en not_active Expired
- 1976-07-23 JP JP8860076A patent/JPS5215506A/en active Pending
- 1976-07-23 IT IT2566276A patent/IT1065061B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5215506A (en) | 1977-02-05 |
| GB1525304A (en) | 1978-09-20 |
| BE844427A (en) | 1976-11-16 |
| AT355067B (en) | 1980-02-11 |
| ATA503776A (en) | 1979-07-15 |
| DE2632554C3 (en) | 1985-04-25 |
| IT1065061B (en) | 1985-02-25 |
| FR2318932A1 (en) | 1977-02-18 |
| DE2632554B2 (en) | 1980-06-04 |
| FR2318932B1 (en) | 1980-02-22 |
| LU73045A1 (en) | 1976-03-02 |
| DE2632554A1 (en) | 1977-02-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |