CN202430254U - Demountable furnace floor and top and bottom combined blowing converter with same - Google Patents
Demountable furnace floor and top and bottom combined blowing converter with same Download PDFInfo
- Publication number
- CN202430254U CN202430254U CN2011205169484U CN201120516948U CN202430254U CN 202430254 U CN202430254 U CN 202430254U CN 2011205169484 U CN2011205169484 U CN 2011205169484U CN 201120516948 U CN201120516948 U CN 201120516948U CN 202430254 U CN202430254 U CN 202430254U
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- furnace bottom
- brick
- layer
- detachable
- shaft
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- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The utility model discloses a demountable furnace floor and a top and bottom combined blowing converter with the same. The demountable furnace floor comprises a furnace floor casing, a furnace floor lining, a bottom blowing element and a bottom blowing seat brick, wherein the furnace floor lining, the bottom blowing element and the bottom blowing seat brick are arranged on the furnace floor casing, and the bottom blowing element is surrounded by the bottom blowing seat brick. The demountable furnace floor is characterized in that the furnace floor lining is in a stepped shape with a high central area and a low edge area. The length of a joint between the furnace floor and a furnace body is increased, so that safety factor of the furnace floor is improved. In addition, the demountable furnace floor is constructed by means of combination of horizontal construction and vertical construction to prevent seams between bricks. Further, the mounting joints are protected by the demountable furnace floor, and thereby the joints can be effectively protected from corrosion.
Description
Technical field
The utility model relates to a kind of furnace bottom, specifically, relates to a kind of detachable furnace bottom and a kind of top and bottom combined blown converter that comprises this detachable furnace bottom.
Background technology
In the use of top and bottom combined blown converter; Building by laying bricks or stones and safeguarding of furnace bottom is very important; Owing to furnace bottom has additional the violent stirring that the furnace bottom gas supply element causes the furnace bottom molten steel, furnace bottom and deteriorate near the furnace lining of furnace bottom faster than other positions, so can influence the bulk life time of top and bottom combined blown converter.For guaranteeing the bulk life time of top and bottom combined blown converter, detachable furnace bottom has been proposed, shaft and furnace bottom are built by laying bricks or stones respectively, again furnace bottom is installed to shaft, be convenient to the maintenance of furnace bottom.
At present, the detachable furnace bottom of top and bottom combined blown converter mainly adopts furnace bottom and shaft bonded mode.Usually, form furnace bottom through the perpendicular refractory brick of building, the seam of shaft and furnace bottom is at bottom of furnace body furnace bottom top, and shaft pours into ramming mass with the furnace bottom seam areas, and dependence bottom of furnace body pin plate is connected with pin or through bolt said seam is compressed.Having the problem that the top and bottom combined blown converter of this furnace bottom mainly exists is: the first, furnace bottom and shaft seam are " one " font, and the inside and outside seam of top and bottom combined blown converter is apart from weak point, and SF is little; The second, because furnace bottom forms through the perpendicular refractory brick of building, specifically, furnace bottom brick cup and refractory brick all adopt perpendicular the block, occur the slit during installation between refractory brick and the refractory brick easily, even decay, and possibly do over again, and influence installation effectiveness; Three, seam areas is installed and lacks protection, be etched easily.
The utility model content
For seam inside and outside solving the converter that existing top and bottom combined blown converter exists apart from occurring the problem that slit and seam areas lack protection between weak point, the perpendicular refractory brick of building of furnace bottom and the refractory brick; The utility model provides a kind of so detachable furnace bottom and a kind of top and bottom combined blown converter that comprises this detachable furnace bottom; Seam between said detachable furnace bottom and the shaft is broken-line type; Thereby prolonged the length of the inside and outside seam of top and bottom combined blown converter, improved SF.
In addition; The utility model provides a kind of so detachable furnace bottom and a kind of top and bottom combined blown converter that comprises this detachable furnace bottom; Said detachable furnace bottom adopts flat the block with the perpendicular mode that combines of building to build by laying bricks or stones; And because the seam between detachable furnace bottom and the shaft is broken-line type, so can prevent the slit to occur between the refractory brick of perpendicular block of detachable furnace bottom.
In addition, the utility model provides a kind of so detachable furnace bottom and a kind of top and bottom combined blown converter that comprises this detachable furnace bottom, protects seam areas is installed; Promptly; Inner at body of heater, at furnace bottom and the flat one deck refractory brick of building of shaft seam areas, for example; Magnesia carbon brick, thus can prevent effectively that seam areas is etched.
The utility model provides a kind of detachable furnace bottom on the one hand; Said detachable furnace bottom comprises the furnace bottom shell and is arranged on bottom lining, bottom blowing element and the bottom blowing brick cup on the furnace bottom shell; Said bottom blowing brick cup surrounds bottom blowing element; Wherein, said bottom lining is the low step shape in middle section high rim zone.
According to the utility model, bottom lining can comprise that the furnace bottom permanent layer that forms according to flat block mode that is successively set on from top to bottom on the furnace bottom shell is with the furnace bottom middle layer and according to erecting the furnace bottom upper strata that the block mode forms.
According to the utility model, the number of bottom blowing element can be for a plurality of, and each bottom blowing element can be passed the furnace bottom shell and is installed on the furnace bottom shell, and said bottom blowing element is positioned at the middle section of bottom lining.
According to the utility model, the furnace bottom permanent layer can be provided with around the bottom blowing brick cup, and the furnace bottom permanent layer is built by laying bricks or stones by magnesia brick and formed.
According to the utility model, the furnace bottom middle layer can be provided with around the bottom blowing brick cup, and the furnace bottom middle layer is built by laying bricks or stones by magnesia carbon brick and formed.
According to the utility model, the furnace bottom upper strata can be provided with around the bottom blowing brick cup, and the furnace bottom upper strata is built by laying bricks or stones by magnesia carbon brick and formed.
According to the utility model, the furnace bottom upper strata can comprise: the brick of first height is arranged on said middle section around the bottom blowing brick cup; The brick of second height, the brick that centers on first height is arranged on said middle section; The brick of the 3rd height is arranged on said fringe region, and wherein, said second height is greater than the 3rd height and less than first height.
According to the utility model, said detachable furnace bottom also can comprise the furnace bottom flange on the top of the periphery that is arranged on the furnace bottom shell, and the upper surface of the brick of said the 3rd height is higher than the upper surface of furnace bottom flange.
According to the utility model on the other hand; A kind of top and bottom combined blown converter is provided; The detachable furnace bottom of said top and bottom combined blown converter bag be positioned at the shaft on the detachable furnace bottom, said detachable furnace bottom and seam between the shaft comprise be perpendicular to one another dock vertically seam of horizontal joint and butt joint.
According to the utility model, said shaft can comprise shaft housing, shaft skin and the shaft internal layer that sets gradually from outside to inside.
According to the utility model, said shaft skin can adopt refractory brick to build by laying bricks or stones according to the mode that is parallel to the shaft housing and form.
According to the utility model, the shaft internal layer can be built by laying bricks or stones on the upper surface of the said fringe region of detachable furnace bottom, and the part that contacts with detachable furnace bottom of shaft internal layer comprises the first layer of building by laying bricks or stones successively from top to bottom, the second layer and the 3rd layer.
According to the utility model, said the first layer, the second layer and the 3rd layer can be built by laying bricks or stones according to the mode of the bottom that is parallel to detachable furnace bottom.
According to the utility model, said the first layer can be formed by the brick of first length, and the gap between the periphery of the brick of said first length and detachable furnace bottom is first distance; The said second layer can be formed by the brick of second length, and the gap between the periphery of the brick of said second length and detachable furnace bottom is a second distance; Said the 3rd layer can be formed by the brick of the 3rd length, and the gap between the periphery of the brick of said the 3rd length and detachable furnace bottom is a second distance, and wherein, second length is greater than first length and less than the 3rd length, and second distance is greater than first distance.
According to the utility model, said shaft also can comprise the part that does not contact with detachable furnace bottom of building by laying bricks or stones on the 3rd layer, thereby forms shaft.
According to the utility model, can fill the butt joint horizontal joint and dock vertically seam through packing material.
According to the utility model, the butt joint vertically portion of sewing on can be built the refractory brick of one deck predetermined length by laying bricks or stones.
According to the detachable furnace bottom of the utility model, because the seam length increase between detachable furnace bottom and the shaft, so improved the SF of said furnace bottom.In addition, the mode that said detachable furnace bottom adopts flat block to combine with perpendicular block is built by laying bricks or stones and is formed, thereby prevents the slit to occur between brick and the brick.In addition, said detachable furnace bottom protects seam areas is installed, thereby can prevent effectively that seam areas is etched.
Description of drawings
In conjunction with the drawings, from the description of following embodiment, the utility model these and/or others and advantage will become clear, and are easier to understand, wherein:
Fig. 1 is the local diagrammatic sketch that schematically shows according to the top and bottom combined blown converter that comprises detachable furnace bottom of the embodiment of the utility model.
Embodiment
Now the embodiment to the utility model carries out detailed description, its example shown in the accompanying drawings, wherein, identical label is represented components identical all the time.Below through embodiment being described to explain the utility model with reference to accompanying drawing.
Fig. 1 is the local diagrammatic sketch that schematically shows according to the top and bottom combined blown converter that comprises detachable furnace bottom of the embodiment of the utility model.With reference to Fig. 1, detachable furnace bottom comprises furnace bottom shell 1, furnace bottom internal layer (refractory brick liner), bottom blowing brick cup and bottom blowing element 4.
Furnace bottom shell 1 is a bowl type, and by metal sheet, for example steel plate is processed.
In the perforate of the appropriate location of furnace bottom shell 1, the said hole that bottom blowing element 4 is installed in furnace bottom shell 1 is located, and makes extraneous gas pass furnace bottom shell 1 and gets in the top and bottom combined blown converters with bottom blowing element 4.
The bottom blowing brick cup is built by laying bricks or stones around bottom blowing element 4, with fixing and protection bottom blowing element 4.The bottom blowing brick cup comprises: protect brick 5 under the bottom blowing, build by laying bricks or stones on the upper surface of furnace bottom shell 1, and center on the bottom of bottom blowing element 4; Protect brick 6 in the bottom blowing, build by laying bricks or stones on the upper surface that under bottom blowing, protects brick 5, and center on the top of bottom blowing element 4.
Alternatively, protect to protect in brick 5 and the bottom blowing forming the recessed and projection that corresponds to each other on the brick 6 under the bottom blowing, combine securely so that protect under the bottom blowing to protect in brick 5 and the bottom blowing between the brick 6.For example, the central authorities that under bottom blowing, protect brick 5 are formed with recessed, and the correspondence position that in bottom blowing, protects brick 6 forms projection, and when building by laying bricks or stones, said projection is inserted in the female, protect brick 6 in brick 5 and the bottom blowing and combine securely thereby make to protect under the bottom blowing.
Though a bottom blowing element 4 has been shown in Fig. 1; But the utility model is not limited thereto, and bottom blowing element 4 can be for a plurality of, for example; Can be three, three bottom blowing element 4 can be on the same circumference in the center of circle at the center with detachable furnace bottom according to arranged at predetermined intervals.Alternatively, the angular interval between first bottom blowing element 4 and second bottom blowing element 4 can be 74 degree, and first bottom blowing element 4 and second bottom blowing element 4 can equate with angular interval between the 3rd bottom blowing element 4, is 143 and spends.Alternatively, said circular diameter can be 0.45 times of the interior diameter of detachable furnace bottom.
Though in the above-described embodiments; The bottom blowing brick cup comprises protecting under the bottom blowing in brick 5 and the bottom blowing and protects brick 6; But the utility model is not limited thereto; The bottom blowing brick cup can only comprise that centering on bottom blowing element 4 is arranged on parts on the furnace bottom shell 1, as long as bottom blowing element 4 can fixed and protect to this bottom blowing brick cup.
The position except that the position of building bottom blowing brick cup and bottom blowing element 4 by laying bricks or stones of furnace bottom shell 1 is built the refractory brick liner by laying bricks or stones, and this refractory brick liner comprises furnace bottom permanent layer 2, furnace bottom middle layer 3 and furnace bottom upper strata from down to up successively.
Bottom permanent layer 2 adopts the flat block of the refractory brick of pre-determined thickness, and for example, said refractory brick can be magnesia brick, and the thickness of said magnesia brick can be about 65mm.The flat block of the refractory brick of pre-determined thickness is adopted in furnace bottom middle layer 3, and for example, said refractory brick can be magnesia carbon brick, and the thickness of said magnesia carbon brick can be about 100mm.
The furnace bottom upper strata adopts perpendicular block of the different refractory brick of multiple length to form.Said refractory brick can be magnesia carbon brick.Specifically, adopt that the magnesia carbon brick 7 of predetermined length is perpendicular to be built with around the bottom blowing brick cup, thus protection bottom blowing brick cup.The length of said magnesia carbon brick 7 can be about 650mm.At the middle section of the bottom of detachable furnace bottom (promptly; The zone that does not contact with the basal surface of shaft; For example; This zone can be that diameter approximately is the border circular areas of 2040mm) periphery that goes up magnesia carbon brick 7 builds the magnesia carbon brick 8 of length less than the length of magnesia carbon brick 7 by laying bricks or stones, and for example, the length of said magnesia carbon brick 8 can approximately be 550mm.The periphery of magnesia carbon brick 8 is built the magnesia carbon brick 9 of length less than the length of magnesia carbon brick 8 by laying bricks or stones on the fringe region (that is, the zone that contact with the basal surface of shaft) of the bottom of detachable furnace bottom, and for example, the length of said magnesia carbon brick 9 can approximately be 200mm.The building the plane by laying bricks or stones and need be higher than furnace bottom flange 10 predetermined heights of this magnesia carbon brick 9, for example, about 20mm.
Alternatively, protecting brick 5 under the bottom blowing can be concordant with furnace bottom middle layer 3.
Though the furnace bottom upper strata of the utility model is adopted magnesia carbon brick 7,8 and 9 to build by laying bricks or stones and is formed; But the utility model is not limited thereto; The furnace bottom upper strata also can be adopted the refractory brick of other types to build by laying bricks or stones and formed, and the height of said refractory brick can be adjusted as required.
Through above-mentioned detachable furnace bottom of building formation by laying bricks or stones according to the utility model.
Continue below to describe according to the shaft of the top and bottom combined blown converter of the utility model and shaft and detachable combining of furnace bottom with reference to Fig. 1.
Shaft is built by laying bricks or stones on the fringe region of the bottom of above-mentioned detachable furnace bottom.As shown in Figure 1, the seam between shaft and the detachable furnace bottom is broken-line type, perpendicular type for example, and specifically, the basal surface of shaft contact with the top surface of detachable furnace bottom, thus horizontal joint 15 is docked in formation between the two; The inner surface of shaft contacts with the outer surface of detachable furnace bottom, thereby between the two, forms vertically seam 16 of butt joint.Angle between the seam 16 approximately is 90 degree to said butt joint horizontal joint 15 with docking vertically.
Shaft comprises shaft housing 11, shaft outer 12 and shaft internal layer 13 from outside to inside successively.
Shaft housing 11 can be by metal sheet, and for example steel plate forms.
Shaft outer 12 adopts refractory brick, and for example, magnesia brick is built by laying bricks or stones according to the mode that is parallel to shaft housing 11, can, the thickness of magnesia brick can be about 65mm.
Shaft internal layer 13 is built by laying bricks or stones on the upper surface of the fringe region of detachable furnace bottom, and the part that contacts with detachable furnace bottom of shaft internal layer 13 comprises the first layer 131 of building by laying bricks or stones successively from top to bottom, the second layer 132 and the 3rd layer 133.
Said the first layer 131, the second layer 132 and the 3rd layer 133 are built by laying bricks or stones according to the mode of the bottom that is parallel to detachable furnace bottom.The first layer 131 can be by the refractory brick of predetermined length, and for example, the rim of the mouth magnesia carbon brick is built by laying bricks or stones and formed, and alternatively, the length of said magnesia carbon brick can be about 520mm, and the gap between the periphery of said magnesia carbon brick and detachable furnace bottom is approximately 60mm.The second layer 132 can be by the refractory brick of length greater than the length of the magnesia carbon brick of the first layer 131, and for example, magnesia carbon brick is built by laying bricks or stones and formed, and the length of said magnesia carbon brick can be about 550mm.The 3rd layer 133 can be by the refractory brick of length greater than the length of the magnesia carbon brick of the second layer 132, and for example, magnesia carbon brick is built by laying bricks or stones and formed, and the length of said magnesia carbon brick can be about 590mm.Gap between the periphery of the second layer 132 and the 3rd layer 133 and detachable furnace bottom is approximately 80mm.
Shaft internal layer 13 also comprises the part that does not contact with detachable furnace bottom of building by laying bricks or stones on the 3rd layer 133.Thereby formation shaft.
Though the part that contacts with detachable furnace bottom of the shaft internal layer 13 of the utility model comprises the first layer 131 of building by laying bricks or stones successively from top to bottom, the second layer 132 and the 3rd layer 133; But the utility model is not limited thereto, and the gap between the periphery of the number of plies that the part that contacts with detachable furnace bottom of shaft internal layer 13 is included and the thickness of each layer and each layer and detachable furnace bottom all can be adjusted as required.
Alternatively, through packing material, for example, magnesia asphalt powder bulk cargo is filled butt joint horizontal joint 15, just its compacting.Preferably, adopt pure calcium aluminate cement to fill at furnace bottom flange 10 joints, and with its compacting.
Alternatively, through packing material, for example, magnesium carbon rammed mass ramming is filled vertically seam 16 of butt joint, and with its compacting.In addition, vertically stitch the refractory brick that one deck predetermined length is built on 16 tops by laying bricks or stones in butt joint, for example, magnesia carbon brick, the length of said magnesia carbon brick can be 400mm, to protect seam better.
According to the detachable furnace bottom of the utility model, the seam between said detachable furnace bottom and the shaft is broken-line type, thereby has prolonged the length of the inside and outside seam of top and bottom combined blown converter, has improved SF.
Detachable furnace bottom according to the utility model; Said detachable furnace bottom adopts flat the block with the perpendicular mode that combines of building to build by laying bricks or stones; And because the seam between detachable furnace bottom and the shaft is broken-line type, so can prevent the slit to occur between the brick of perpendicular block of detachable furnace bottom.
According to the detachable furnace bottom of the utility model, to being installed, seam areas protects, and promptly inner at body of heater, at furnace bottom and the flat one deck refractory brick of building of shaft seam areas, for example, and magnesia carbon brick, thus can prevent effectively that seam areas is etched.
Though the utility model is specifically described with reference to its exemplary embodiment and is shown; But will be understood by those skilled in the art that; Under the situation of spirit that does not break away from the utility model that is defined by the claims and scope, can carry out the various changes of form and details to it.
Claims (17)
1. detachable furnace bottom; Said detachable furnace bottom comprises the furnace bottom shell and is arranged on bottom lining, bottom blowing element and the bottom blowing brick cup on the furnace bottom shell; Said bottom blowing brick cup surrounds bottom blowing element, it is characterized in that, said bottom lining is the low step shape in middle section high rim zone.
2. detachable furnace bottom as claimed in claim 1 is characterized in that, bottom lining comprises that the furnace bottom permanent layer that forms according to flat block mode that is successively set on from top to bottom on the furnace bottom shell is with the furnace bottom middle layer and according to erecting the furnace bottom upper strata that the block mode forms.
3. detachable furnace bottom as claimed in claim 2 is characterized in that, the number of bottom blowing element is a plurality of, and each bottom blowing element is passed the furnace bottom shell and is installed on the furnace bottom shell, and said a plurality of bottom blowing element is positioned at the middle section of bottom lining.
4. detachable furnace bottom as claimed in claim 3 is characterized in that, the furnace bottom permanent layer is provided with around the bottom blowing brick cup, and the furnace bottom permanent layer is built by laying bricks or stones by magnesia brick and formed.
5. detachable furnace bottom as claimed in claim 4 is characterized in that, the furnace bottom middle layer is provided with around the bottom blowing brick cup, and the furnace bottom middle layer is built by laying bricks or stones by magnesia carbon brick and formed.
6. detachable furnace bottom as claimed in claim 5 is characterized in that, the furnace bottom upper strata is provided with around the bottom blowing brick cup, and the furnace bottom upper strata is built by laying bricks or stones by magnesia carbon brick and formed.
7. detachable furnace bottom as claimed in claim 6 is characterized in that, the furnace bottom upper strata comprises: the brick of first height is arranged on said middle section around the bottom blowing brick cup; The brick of second height, the brick that centers on first height is arranged on said middle section; The brick of the 3rd height is arranged on said fringe region, and wherein, said second height is greater than the 3rd height and less than first height.
8. detachable furnace bottom as claimed in claim 7 is characterized in that, said detachable furnace bottom also comprises the furnace bottom flange on the top of the periphery that is arranged on the furnace bottom shell, and the upper surface of the brick of said the 3rd height is higher than the upper surface of furnace bottom flange.
9. top and bottom combined blown converter; It is characterized in that; Said top and bottom combined blown converter comprise as each described detachable furnace bottom among the claim 1-8 be positioned at the shaft on the detachable furnace bottom, said detachable furnace bottom and seam between the shaft comprise be perpendicular to one another dock vertically seam of horizontal joint and butt joint.
10. top and bottom combined blown converter as claimed in claim 9 is characterized in that, said shaft comprises shaft housing, shaft skin and the shaft internal layer that sets gradually from outside to inside.
11. top and bottom combined blown converter as claimed in claim 10 is characterized in that, the outer employing of said shaft refractory brick is built by laying bricks or stones according to the mode that is parallel to the shaft housing and is formed.
12. top and bottom combined blown converter as claimed in claim 11; It is characterized in that; The shaft internal layer is built by laying bricks or stones on the upper surface of the said fringe region of detachable furnace bottom, and the part that contacts with detachable furnace bottom of shaft internal layer comprises the first layer of building by laying bricks or stones successively from top to bottom, the second layer and the 3rd layer.
13. top and bottom combined blown converter as claimed in claim 12 is characterized in that, said the first layer, the second layer and the 3rd layer are built by laying bricks or stones according to the mode of the bottom that is parallel to detachable furnace bottom.
14. top and bottom combined blown converter as claimed in claim 13 is characterized in that, said the first layer is formed by the brick of first length, and the gap between the periphery of the brick of said first length and detachable furnace bottom is first distance; The said second layer is formed by the brick of second length, and the gap between the periphery of the brick of said second length and detachable furnace bottom is a second distance; Said the 3rd layer of brick by the 3rd length forms, and the gap between the periphery of the brick of said the 3rd length and detachable furnace bottom is a second distance, and wherein, second length is greater than first length and less than the 3rd length, and second distance is greater than first distance.
15. top and bottom combined blown converter as claimed in claim 14 is characterized in that, said shaft also comprises the part that does not contact with detachable furnace bottom of building by laying bricks or stones on the 3rd layer, thereby forms shaft.
16. top and bottom combined blown converter as claimed in claim 9 is characterized in that, fills butt joint horizontal joint and the vertical seam of butt joint through packing material.
17. top and bottom combined blown converter as claimed in claim 9 is characterized in that, the refractory brick of one deck predetermined length is built in the butt joint vertically portion of sewing on by laying bricks or stones.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205169484U CN202430254U (en) | 2011-12-12 | 2011-12-12 | Demountable furnace floor and top and bottom combined blowing converter with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205169484U CN202430254U (en) | 2011-12-12 | 2011-12-12 | Demountable furnace floor and top and bottom combined blowing converter with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202430254U true CN202430254U (en) | 2012-09-12 |
Family
ID=46779718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205169484U Expired - Fee Related CN202430254U (en) | 2011-12-12 | 2011-12-12 | Demountable furnace floor and top and bottom combined blowing converter with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202430254U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108265155A (en) * | 2018-03-12 | 2018-07-10 | 海城利尔麦格西塔材料有限公司 | Flat brick building structure is returned in a kind of ball-type converter |
-
2011
- 2011-12-12 CN CN2011205169484U patent/CN202430254U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108265155A (en) * | 2018-03-12 | 2018-07-10 | 海城利尔麦格西塔材料有限公司 | Flat brick building structure is returned in a kind of ball-type converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120912 Termination date: 20151212 |
|
| EXPY | Termination of patent right or utility model |