JPH0144430B2 - - Google Patents
Info
- Publication number
- JPH0144430B2 JPH0144430B2 JP13496686A JP13496686A JPH0144430B2 JP H0144430 B2 JPH0144430 B2 JP H0144430B2 JP 13496686 A JP13496686 A JP 13496686A JP 13496686 A JP13496686 A JP 13496686A JP H0144430 B2 JPH0144430 B2 JP H0144430B2
- Authority
- JP
- Japan
- Prior art keywords
- refractory
- ladle
- lid
- burner
- air
- 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
- 238000001035 drying Methods 0.000 claims description 21
- 239000007789 gas Substances 0.000 description 22
- 238000002485 combustion reaction Methods 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000000567 combustion gas Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Landscapes
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、製鉄所、製鋼所または窯業メーカ
ー等において、溶銑、溶鋼その他溶融金属を収容
する取鍋の内張り耐火物の張り替え時における、
前記内張り耐火物の乾燥装置に関するものであ
る。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for relining the refractory lining of a ladle that accommodates hot metal, molten steel, and other molten metals at a steel mill, a steel mill, or a ceramic manufacturer.
The present invention relates to a drying device for the refractory lining.
製鉄所、製鋼所または窯業メーカー等におい
て、溶銑、溶鋼その他溶融金属を収容するための
取鍋は、その内張り耐火物の張り替えを行なつた
ときに、内張り耐火物を乾燥することが必要であ
る。第６図は従来の取鍋の内張り耐火物の乾燥装
置の１例を示す一部切穴き側面断面図である。第
６図に示すように、従来の乾燥装置は、取鍋１３
の上端に載置して、取鍋１３の開口面を覆う、下
面に断熱材１５が張設された蓋１６と、蓋１６
に、蓋１６を貫通して設けられた乾燥用バーナ１
７と、蓋１６に、蓋１６を貫通して設けられた排
ガス排出用の煙突２０と、煙突２０の途中に設け
られた熱交換器１８とからなつている。１９は取
鍋１３の鉄皮である。
In ironworks, steel mills, ceramic manufacturers, etc., when the refractory lining of ladles used to store hot metal, molten steel, and other molten metals is replaced, it is necessary to dry the refractory lining. . FIG. 6 is a partially perforated side sectional view showing an example of a conventional ladle lining refractory drying device. As shown in FIG. 6, the conventional drying device has a ladle 13
a lid 16 placed on the upper end to cover the opening surface of the ladle 13 and having a heat insulating material 15 stretched on the lower surface;
A drying burner 1 is provided through the lid 16.
7, a chimney 20 for discharging exhaust gas provided through the lid 16, and a heat exchanger 18 provided in the middle of the chimney 20. 19 is the iron skin of the ladle 13.
取鍋１３の内張り耐火物１４を乾燥するに当つ
ては、蓋１６を取鍋１３の上端に載置して、取鍋
１３の開口面を覆う。次いで、乾燥用バーナ１７
によつて取鍋１３内に燃焼ガスを噴射し、その熱
によつて内張り耐火物１４を乾燥する。このよう
にして、内張り耐火物１４を乾燥した高温の燃焼
排ガスは、煙突２０を通つて、取鍋１３内から外
部へ排出される。熱交換器１８は、バーナ１７の
燃焼用の空気を取り入れる配管２１内の空気を昇
温するために設けられている。バーナ１７の燃焼
時の空気は、熱交換器１８を通るバーナ１７の排
ガスによつて昇温される。バーナ１７から噴射す
る火炎の温度は、燃焼用の空気が昇温されること
により高温となり、取鍋１３の内張り耐火物１４
の乾燥能率の向上に役立つている。 When drying the refractory lining 14 of the ladle 13, the lid 16 is placed on the upper end of the ladle 13 to cover the opening surface of the ladle 13. Next, the drying burner 17
Combustion gas is injected into the ladle 13, and the refractory lining 14 is dried by the heat. The high-temperature combustion exhaust gas that has dried the refractory lining 14 in this manner is discharged from the inside of the ladle 13 to the outside through the chimney 20. The heat exchanger 18 is provided to raise the temperature of the air in the pipe 21 that takes in air for combustion in the burner 17. The air during combustion in the burner 17 is heated by the exhaust gas from the burner 17 passing through the heat exchanger 18 . The temperature of the flame injected from the burner 17 becomes high as the temperature of the combustion air increases, and the temperature of the flame injected from the burner 17 becomes high, and
Helps improve drying efficiency.
しかしながら、上述した従来の耐火物乾燥装置
には、次のような問題がある。 However, the conventional refractory drying apparatus described above has the following problems.
蓋には、バーナ、熱交換器、燃料配管、燃焼
空気配管、およびその他の各種制御装置等が、
取り付けられているので、蓋がこれら装置で複
雑になり、各装置の保守点検が困難である。さ
らにこれらの装置を取り付けるために蓋の強度
を強化する必要があるので、蓋の重量が大きく
なる。 The lid contains burners, heat exchangers, fuel piping, combustion air piping, and other various control devices.
Because of the mounting, the lid is complicated by these devices and maintenance and inspection of each device is difficult. Furthermore, the strength of the lid must be strengthened in order to attach these devices, which increases the weight of the lid.
熱交換器のように、高さの大きいものがある
ため、装置全体の高さが高くなる。 Some devices, such as heat exchangers, are tall, so the overall height of the device increases.
蓋の重量が重く、装置の高さ寸法が大きいた
め、装置の移動、取扱い等に困難性が伴うとと
もに、天井クレーン等の懸吊荷重制限、高さ制
限等の条件によつて取扱いが規制を受けること
がある。 Because the lid is heavy and the height of the device is large, it is difficult to move and handle the device, and handling is restricted due to conditions such as hanging load restrictions and height restrictions for overhead cranes, etc. I may receive it.
燃焼用空気の予熱は、煙突を通過する排ガス
の熱のみで行われる。従つて、煙突以外の部
分、例えば取鍋の上縁と蓋の下面との接触部の
隙間から逃げる排ガスの量が多いと、煙突を通
過する排ガスの量が減少するので、燃焼用空気
の予熱効果があがらない。 Preheating of the combustion air is performed solely by the heat of the exhaust gases passing through the chimney. Therefore, if there is a large amount of exhaust gas escaping from parts other than the chimney, such as the gap between the upper edge of the ladle and the bottom surface of the lid, the amount of exhaust gas passing through the chimney will decrease, so preheating of the combustion air will be reduced. It's not effective.
従つてこの発明の目的は、取鍋内の燃焼排ガス
の熱によつて、バーナの燃焼空気を、効率良く、
しかも確実に昇温することが可能な、取鍋の内張
り耐火物乾燥装置を提供することにある。
Therefore, an object of the present invention is to efficiently convert the combustion air of the burner by using the heat of the combustion exhaust gas in the ladle.
Moreover, it is an object of the present invention to provide a ladle lining refractory drying device that can reliably raise the temperature.
この発明は、取鍋の上端に載置して、前記取鍋
の開口面を覆う蓋と、前記蓋の中央部に貫通して
設けられたバーナとからなる取鍋の内張り耐火物
乾燥装置において、前記蓋を環状枠と前記環状枠
の直径部に取り付けられた支持板と、前記環状枠
および前記支持板の下面に取り付けられた耐火物
とから構成し、前記耐火物に、一方の端部が前記
蓋の側面部において空気取入用配管に連結され、
他方の端部が前記バーナに連結された、前記一方
の端部から取り入れた空気を、前記他方の端部か
ら前記バーナに送り込むための複数条の空気流通
孔と、前記複数条の空気流通孔間において前記耐
火物を垂直に貫通する複数個の排ガス排出孔とを
設けたことに特徴を有するものである。
The present invention provides a ladle lining refractory drying device comprising a lid placed on the upper end of the ladle to cover the opening surface of the ladle, and a burner penetrating through the center of the lid. , the lid is composed of an annular frame, a support plate attached to a diameter part of the annular frame, and a refractory attached to the lower surface of the annular frame and the support plate, and one end of the lid is attached to the refractory. is connected to an air intake pipe at a side part of the lid,
a plurality of air circulation holes, the other end of which is connected to the burner, for sending air taken in from the one end to the burner from the other end; and the plurality of air circulation holes. The present invention is characterized in that a plurality of exhaust gas exhaust holes are provided that vertically penetrate the refractory material in between.
次にこの発明を図面を参照しながら説明する。
第１図はこの発明の取鍋の内張り耐火物乾燥装置
の１実施態様を示す平面図、第２図は側面図、第
３図は蓋下面の耐火物の部分斜視図である。第１
図〜第３図に示すように、取鍋の内張り耐火物乾
燥装置１は、蓋２およびバーナ３からなつてい
る。バーナ３は蓋２の中央部に蓋２を貫通して設
けられている。蓋２は、環状枠４と環状枠４の直
径部に取り付けられた支持板５と、環状枠４およ
び支持板５の下面に取り付けられた耐火物６とに
よつて構成されている。耐火物６は、コージユラ
イト質のセラミツク材質の成形（焼成）が可能
で、且つ、耐熱性に優れた断熱材を使用するべき
である。耐火物６は、ボルト締結式、嵌め込み
式、または、固定式により、環状枠４および支持
板５に取り付けられる。耐火物６には、支持板５
と平行に断面が四角形の複数条の空気流通孔７
が、蓋２の一方の側面部２ａから、他方の側面部
２ｂまで貫通して設けられている。耐火物６に
は、耐火物６を垂直に貫通する断面が四角形の複
数個の排ガス排出孔８が設けられている。排ガス
排出孔８は、第３図に示すように、複数条の空気
流通孔７，７…間に、一定の間隔をあけて、耐火
物６のほぼ全面に設けられている。空気流通孔７
と排ガス排出孔８との間の耐火物６ａの厚さは、
１〜５mmとするべきである。蓋２の一方の側面部
２ａには、側面部２ａの形状に沿つて、空気導入
用の集合管９が弧状に設けられている。集合管９
は、複数条の空気流通孔７の各々の一端に接続さ
れ、空気取入用配管１０から取り入れた、バーナ
３の燃焼用の空気を、複数条の空気流通孔７の
各々に送り込む。蓋２の他方の側面部２ｂには、
側面部２ｂの形状に沿つて、空気排出用の集合管
１１，１１が弧状に設けられている。集合管１
１，１１は、複数条の空気流通孔７の各々の他端
に接続されている。集合管１１，１１の上部に
は、集合管１１，１１から排出された空気を、バ
ーナ３に送り込むための連結管１２，１２が接続
されている。
Next, the present invention will be explained with reference to the drawings.
FIG. 1 is a plan view showing one embodiment of the ladle lining refractory drying device of the present invention, FIG. 2 is a side view, and FIG. 3 is a partial perspective view of the refractory on the lower surface of the lid. 1st
As shown in FIGS. 3 to 3, a ladle lining refractory drying device 1 includes a lid 2 and a burner 3. The burner 3 is provided in the center of the lid 2 so as to penetrate through the lid 2. The lid 2 is composed of an annular frame 4, a support plate 5 attached to the diameter portion of the annular frame 4, and a refractory 6 attached to the lower surface of the annular frame 4 and the support plate 5. The refractory 6 should be a heat insulating material that can be molded (fired) from cordierite ceramic material and has excellent heat resistance. The refractory 6 is attached to the annular frame 4 and the support plate 5 by bolting, fitting, or fixed. The support plate 5 is attached to the refractory 6.
Multiple air circulation holes 7 with a rectangular cross section parallel to the
is provided to penetrate from one side surface portion 2a of the lid 2 to the other side surface portion 2b. The refractory 6 is provided with a plurality of exhaust gas discharge holes 8 having a rectangular cross section and extending vertically through the refractory 6. As shown in FIG. 3, the exhaust gas discharge holes 8 are provided on almost the entire surface of the refractory 6 at regular intervals between the plurality of air circulation holes 7, 7, . . . . Air circulation hole 7
The thickness of the refractory 6a between and the exhaust gas discharge hole 8 is:
It should be between 1 and 5 mm. On one side surface 2a of the lid 2, a collecting pipe 9 for introducing air is provided in an arc shape along the shape of the side surface 2a. Collection pipe 9
is connected to one end of each of the plurality of air circulation holes 7, and sends combustion air for the burner 3 taken in from the air intake pipe 10 to each of the plurality of air circulation holes 7. On the other side 2b of the lid 2,
Collecting pipes 11, 11 for air discharge are provided in an arc shape along the shape of the side surface portion 2b. Collecting pipe 1
1 and 11 are connected to the other end of each of the plurality of air circulation holes 7. Connecting pipes 12, 12 for sending air discharged from the collecting pipes 11, 11 to the burner 3 are connected to the upper parts of the collecting pipes 11, 11.
第４図はこの発明の取鍋の内張り耐火物乾燥装
置を取鍋に載置した状態を示す一部切欠き側面断
面図である。第４図に示すように、取鍋の内張り
耐火物を乾燥する場合には、先ず、取鍋の内張り
耐火物乾燥装置１を、取鍋１３の上端に載置して
取鍋１３の開口面を覆う。次いで、バーナ３によ
り、取鍋１３内に燃焼ガスを噴射させて、取鍋１
３の内張り耐火物１４の乾燥を行う。１９は取鍋
１３の鉄皮である。燃焼中の燃焼ガスの排ガス
は、蓋２の下面全体を加熱した後、排ガス排出孔
８から、取鍋１３の外部へ排出される。この際、
空気流通孔７内を通る空気は、耐火物６を通し
て、燃焼ガスの排ガスにより昇温される。この昇
温された空気は集合管１１，１１および連結管１
２，１２を通つて、バーナ３に送り込まれ、バー
ナ３の燃焼用空気として使用される。バーナ３
は、昇温された空気により、効率良く高温の燃焼
ガスを取鍋１３内に噴射することができる。 FIG. 4 is a partially cutaway side sectional view showing the ladle lining refractory drying device of the present invention placed on a ladle. As shown in FIG. 4, when drying the refractory lining of a ladle, first, the ladle lining refractory dryer 1 is placed on the upper end of the ladle 13 and the opening surface of the ladle 13 is dried. cover. Next, combustion gas is injected into the ladle 13 by the burner 3, and the ladle 1
Dry the lining refractory 14 in step 3. 19 is the iron skin of the ladle 13. The exhaust gas of the combustion gas during combustion heats the entire lower surface of the lid 2 and is then discharged to the outside of the ladle 13 through the exhaust gas discharge hole 8. On this occasion,
The air passing through the air circulation hole 7 passes through the refractory 6 and is heated by the exhaust gas of the combustion gas. This heated air is transferred to the collecting pipes 11, 11 and the connecting pipe 1.
2 and 12, and is sent to the burner 3 and used as combustion air for the burner 3. Burner 3
By using the heated air, high temperature combustion gas can be efficiently injected into the ladle 13.
第５図は、この発明の他の実施態様を示す平面
図である。この実施態様においては、排ガス排出
孔８の数が少なく、例えば第５図に示すように、
耐火物６の中央部にのみ設けられている。このよ
うに、排ガス排出孔８の数を少なくすると、燃焼
排ガスにより蓋２が高温に加熱されるため、バー
ナ３に送り込まれる空気の温度を高めることがで
きる。さらに、バーナ３に送り込まれる空気の温
度をより高めるためには、排ガス排出孔８を少数
とし、さらに、排ガス排出孔８および空気流通孔
７が設けられていない耐火物６の下面に上部が塞
がつた垂直な溝を設けて、蓋２の下面の熱を受け
る面積を大きくする。 FIG. 5 is a plan view showing another embodiment of the invention. In this embodiment, the number of exhaust gas discharge holes 8 is small, for example, as shown in FIG.
It is provided only in the center of the refractory 6. When the number of exhaust gas discharge holes 8 is reduced in this manner, the lid 2 is heated to a high temperature by the combustion exhaust gas, so that the temperature of the air sent into the burner 3 can be increased. Furthermore, in order to further increase the temperature of the air sent to the burner 3, the number of exhaust gas discharge holes 8 is reduced, and the lower surface of the refractory 6 where the exhaust gas discharge holes 8 and the air circulation holes 7 are not provided is blocked at the top. A rough vertical groove is provided to increase the area of the lower surface of the lid 2 that receives heat.
なお、空気流通孔７および排ガス排出孔８の断
面形状は、矩形、六角形等の多角形、丸形等のい
ずれでもよい。 Note that the cross-sectional shapes of the air circulation holes 7 and the exhaust gas discharge holes 8 may be any one of a rectangular shape, a polygonal shape such as a hexagonal shape, a round shape, and the like.
以上述べたように、この発明の取鍋の内張り耐
火物乾燥装置によれば、
蓋の上に熱交換器および煙突を搭載しない構
造なので、保守点検が容易に行える。
As described above, the ladle lining refractory drying device of the present invention has a structure in which neither a heat exchanger nor a chimney is mounted on the lid, making maintenance and inspection easy.
空気の通過する部分が中空なため、さらに、
耐火物として使用するセラミツク材自体が軽量
なため、蓋全体の重量が軽減する。 Furthermore, since the part through which the air passes is hollow,
Since the ceramic material used as the refractory material itself is lightweight, the weight of the entire lid is reduced.
熱交換器および煙突がないので、装置全体の
高さが減少し、取扱い、移動等が容易となり、
天井クレーン等の懸吊荷重制限等の制限を受け
ない。 Since there is no heat exchanger or chimney, the overall height of the device is reduced, making it easier to handle and move.
It is not subject to restrictions such as hanging load restrictions of overhead cranes, etc.
取鍋内の燃焼排ガスの熱を、蓋の下面のほぼ
全面で受けることができるので、効率良く熱交
換をすることができ、省エネに寄与する。 Since the heat of the combustion exhaust gas in the ladle can be received over almost the entire bottom surface of the lid, heat can be exchanged efficiently, contributing to energy savings.
等、工業上優れた効果がもたらされる。etc., bring about excellent industrial effects.
第１図はこの発明の取鍋の内張り耐火物乾燥装
置の１実施態様を示す平面図、第２図は側面図、
第３図は蓋下面の耐火物の部分斜視図、第４図は
この発明の取鍋の内張り耐火物乾燥装置を取鍋に
載置した状態を示す一部切欠き側面断面図、第５
図はこの発明の他の実施態様を示す平面図、第６
図は従来の取鍋の内張り耐火物乾燥装置の１例を
示す一部切欠き側面断面図である。図面におい
て、
１……取鍋の内張り耐火物乾燥装置、２……
蓋、３……バーナ、４……環状枠、５……支持
板、６……耐火物、７……空気流通孔、８……排
ガス排出孔、９……集合管、１０……空気取入用
配管、１１……集合管、１２……連結管、１３…
…取鍋、１４……耐火物、１５……断熱材、１６
……蓋、１７……バーナ、１８……熱交換器、１
９……鉄皮、２０……煙突、２１……配管。
FIG. 1 is a plan view showing one embodiment of the ladle lining refractory drying device of the present invention, FIG. 2 is a side view,
FIG. 3 is a partial perspective view of the refractory on the lower surface of the lid, FIG. 4 is a partially cutaway side sectional view showing the ladle lining refractory drying device of the present invention placed on the ladle, and FIG.
Figure 6 is a plan view showing another embodiment of the invention.
The figure is a partially cutaway side sectional view showing an example of a conventional ladle lining refractory drying device. In the drawings, 1... Ladle lining refractory drying device, 2...
Lid, 3...burner, 4...annular frame, 5...support plate, 6...refractory, 7...air circulation hole, 8...exhaust gas discharge hole, 9...collecting pipe, 10...air intake Necessary piping, 11...collecting pipe, 12...connecting pipe, 13...
...Ladle, 14...Refractory, 15...Insulating material, 16
... Lid, 17 ... Burner, 18 ... Heat exchanger, 1
9... Iron skin, 20... Chimney, 21... Piping.
Claims (1)
覆う蓋と、前記蓋の中央部に貫通して設けられた
バーナとからなる取鍋の内張り耐火物乾燥装置に
おいて、 前記蓋を環状枠と前記環状枠の直径部に取り付
けられた支持板と、前記環状枠および前記支持板
の下面に取り付けられた耐火物とから構成し、前
記耐火物に、一方の端部が前記蓋の側面部におい
て空気取入用配管に連結され、他方の端部が前記
バーナに連結された、前記一方の端部から取り入
れた空気を、前記他方の端部から前記バーナに送
り込むための複数条の空気流通孔と、前記複数条
の空気流通孔間において、前記耐火物を垂直に貫
通する複数個の排ガス排出孔とを設けたことを特
徴とする取鍋の内張り耐火物乾燥装置。[Claims] 1. A refractory lining for a ladle, which comprises a lid that is placed on the upper end of the ladle and covers the opening surface of the ladle, and a burner that is provided through the center of the lid. In the drying device, the lid includes an annular frame, a support plate attached to a diameter portion of the annular frame, and a refractory attached to the lower surface of the annular frame and the support plate, and the refractory has one side. An end of the lid is connected to an air intake pipe on a side surface of the lid, and the other end is connected to the burner. A refractory lining for a ladle, characterized in that a plurality of air circulation holes are provided for feeding air into the refractory, and a plurality of exhaust gas discharge holes that vertically penetrate the refractory are provided between the plurality of air circulation holes. Material drying equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13496686A JPS62292253A (en) | 1986-06-12 | 1986-06-12 | Drying device for lining refractory of ladle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13496686A JPS62292253A (en) | 1986-06-12 | 1986-06-12 | Drying device for lining refractory of ladle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62292253A JPS62292253A (en) | 1987-12-18 |
| JPH0144430B2 true JPH0144430B2 (en) | 1989-09-27 |
Family
ID=15140752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13496686A Granted JPS62292253A (en) | 1986-06-12 | 1986-06-12 | Drying device for lining refractory of ladle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62292253A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02127363U (en) * | 1989-03-30 | 1990-10-19 | ||
| CN110434320A (en) * | 2019-09-18 | 2019-11-12 | 山东钢铁股份有限公司 | A kind of steel smelting equipment and its baking of tundish device protection plate |
| CN111922327B (en) * | 2020-09-24 | 2022-07-05 | 河北煜剑节能技术有限公司 | High-efficient be built by contract and roast package ware |
-
1986
- 1986-06-12 JP JP13496686A patent/JPS62292253A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62292253A (en) | 1987-12-18 |
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