JPS63286527A - Apparatus for treating molten metal - Google Patents
Apparatus for treating molten metalInfo
- Publication number
- JPS63286527A JPS63286527A JP12026387A JP12026387A JPS63286527A JP S63286527 A JPS63286527 A JP S63286527A JP 12026387 A JP12026387 A JP 12026387A JP 12026387 A JP12026387 A JP 12026387A JP S63286527 A JPS63286527 A JP S63286527A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- gas
- inert gas
- lance
- metal processing
- 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.)
- Pending
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 55
- 239000002184 metal Substances 0.000 title claims abstract description 55
- 238000007664 blowing Methods 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 239000007789 gas Substances 0.000 abstract description 32
- 239000011261 inert gas Substances 0.000 abstract description 26
- 238000000034 method Methods 0.000 abstract description 7
- 239000001257 hydrogen Substances 0.000 abstract 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 abstract 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は溶湯の有害ガスおよび非金属介在物の除去に使
用される溶湯処理装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a molten metal processing apparatus used for removing harmful gases and nonmetallic inclusions from molten metal.
（従来の技術）
鋳造前の溶湯には水素ガスなどの有害ガスや非金属介在
物が含まれており、これらの有害ガスや非金属介在物は
得られた鋳塊およびこの鋳塊から作られる製品に欠陥を
生じさせる原因となっている。そのため、溶湯中から水
素ガスや非金属介在物を除去する必要があり、これらを
除去する処理方法として溶湯中に窒素ガス、アルゴンガ
ス等の不活性ガスを気泡状態で吹込む方法が従来から採
用されていた。(Prior art) Molten metal before casting contains harmful gases such as hydrogen gas and nonmetallic inclusions, and these harmful gases and nonmetallic inclusions are produced in the obtained ingot and the ingot made from this ingot. This causes product defects. Therefore, it is necessary to remove hydrogen gas and nonmetallic inclusions from the molten metal, and the conventional treatment method for removing these has been to blow inert gas such as nitrogen gas or argon gas into the molten metal in the form of bubbles. It had been.
従来上述した方法を実行する溶湯処理装置としては、炉
心に挿入される不活性ガス吹込み用ランスを先端に取付
けた黒鉛製の処理ガス吹込みパイプを自転させながら溶
湯処理を行なう装置が、例えば特開昭６０−２０８４３
２号公報において知られている。Conventional molten metal processing equipment that carries out the above-mentioned method includes, for example, equipment that processes molten metal while rotating a graphite processing gas injection pipe that is inserted into the reactor core and has an inert gas injection lance attached to its tip. Japanese Patent Publication No. 60-20843
It is known from Publication No. 2.
（発明が解決しようとする問題点）
しかしながら、不活性ガス吹込み用ランスは炉心に挿入
されるため、たとえ炉心で自転させたとしても発生した
気泡が炉中央に集中するとともにパイプに巻き付く仁と
もあり、炉全体に気泡が広がらない欠点が特に炉の直径
が大きくなるに従って顕著であった。(Problem to be solved by the invention) However, since the lance for inert gas injection is inserted into the reactor core, even if it is rotated in the reactor core, the generated bubbles will concentrate in the center of the reactor and the bubbles will wrap around the pipes. However, the disadvantage that bubbles could not spread throughout the furnace was particularly noticeable as the diameter of the furnace became larger.
そのため、処理ガスと溶湯との接触面積が小さくならざ
るを得す、有害ガスおよび非金属介在物の除去効率が悪
くなるとともに処理に長時間を要するため、不活性ガス
の消費量も多く経済的にも問題があった。Therefore, the contact area between the process gas and the molten metal has to be small, the removal efficiency of harmful gases and non-metallic inclusions is poor, and the process takes a long time, resulting in a large amount of inert gas consumption. There was also a problem.
本発明の目的は上述した不具合を解消して、有害ガスお
よび非金属介在物の除去効率を向上させることができる
溶湯処理装置を提供しようとするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a molten metal processing apparatus capable of solving the above-mentioned problems and improving the removal efficiency of harmful gases and nonmetallic inclusions.
（問題点を解決するための手段）
本発明の溶湯処理装置は、溶湯処理槽と、溶湯処理槽内
へ挿脱可能であって先端にガス吹込み用ランスを設けた
ガス吹込みパイプと、ガス吹込みパイプを自転させる自
転用駆動装置と、ガス吹込みパイプを溶湯処理槽の中心
に対して公転させる公転用駆動装置とを具え、ガス吹込
みパイプを自転と同時に公転させながら溶湯を処理する
ことを特徴とするものである。(Means for Solving the Problems) The molten metal processing apparatus of the present invention includes a molten metal processing tank, a gas blowing pipe that can be inserted into and removed from the molten metal processing tank and has a gas blowing lance at its tip. Equipped with an autorotation drive device that rotates the gas injection pipe and a revolution drive device that makes the gas injection pipe revolve around the center of the molten metal processing tank, molten metal is processed while the gas injection pipe rotates and revolves at the same time. It is characterized by:
（作 用）
上述した構成において、先端にガス吹込み用ランスを設
けたガス吹込みパイプを、自転用駆動装置により自転さ
せるとともに溶湯処理装置の中心に対して公転用駆動装
置により公転させることにより、溶湯中での気泡が装置
全体に広がり有害ガスや非金属介在物の除去を効率よ〈
実施することができる。(Function) In the above-mentioned configuration, the gas blowing pipe, which has a gas blowing lance at its tip, is rotated by the rotation drive device and revolved around the center of the molten metal processing device by the revolution drive device. , bubbles in the molten metal spread throughout the equipment, making removal of harmful gases and non-metallic inclusions more efficient.
It can be implemented.
また、複数のガス吹込みパイプを使用し各ガス吹込みパ
イプの溶湯処理装置の中心に対する半径を異ならせた場
合は、パイプ１本の場合より有害ガスや非金属介在物の
除去効率をさらに改善できるため好ましい。In addition, when multiple gas injection pipes are used and each gas injection pipe has a different radius relative to the center of the molten metal processing equipment, the removal efficiency of harmful gases and nonmetallic inclusions is further improved compared to the case with a single pipe. It is preferable because it can be done.
さらに、ガス吹込み用ランスのガス吹込み部がガス吹込
みパイプの中心軸に対して下方拡がりのテーパを有して
いると、発生する気泡の巻き込みによる粗大化が防止さ
れ微細な気泡を溶湯中に供給でき、有害ガスや非金属介
在物の除去効率をさらに改善できるため好ましい。Furthermore, if the gas blowing part of the gas blowing lance has a taper that expands downward with respect to the central axis of the gas blowing pipe, it is possible to prevent the bubbles that are generated from becoming coarse due to entrainment, and to remove fine bubbles from the molten metal. This is preferable because it can be supplied into the atmosphere and further improve the removal efficiency of harmful gases and nonmetallic inclusions.
（実施例）
第１図は本発明の溶湯処理装置の一実施例の部分断面図
である。第１図において、溶湯１を貯留する炉２の上部
に段部３を設け、この段部３に円筒形の支持枠４が挿脱
可能なように構成する。支持枠４の上部には段部５を設
け、この段部５上に複数の歯車６と回転テーブル７の外
周部に設けた歯部８とを噛合させた状態で載置する。複
数の歯車６のうちの１個は支持枠４の一部に設けた支持
プレート９上の公転用モーター１０と接続され、この公
転用モーター１０を駆動することにより回転テーブル７
は段部５上で回転する。(Embodiment) FIG. 1 is a partial sectional view of an embodiment of the molten metal processing apparatus of the present invention. In FIG. 1, a step 3 is provided at the upper part of a furnace 2 for storing molten metal 1, and a cylindrical support frame 4 is configured to be removably inserted into this step 3. A step part 5 is provided on the upper part of the support frame 4, and a plurality of gears 6 and a tooth part 8 provided on the outer peripheral part of the rotary table 7 are placed on this step part 5 in a meshed state. One of the plurality of gears 6 is connected to a revolution motor 10 on a support plate 9 provided in a part of the support frame 4, and by driving this revolution motor 10, the rotation table 7 is rotated.
rotates on the stepped portion 5.
回転テーブル７の表面上には、支持台１１を介して自転
用モーター１２と不活性ガス吹込み口１３を設ける。不
活性ガス吹込み口１３の上端および下端は回動自在に構
成する。また、回転テーブル７の裏面上にはコネクター
１４を介して先端に不活性ガス吹込み用ランス１５を設
けた不活性ガス吹込みパイプ１６を設ける。先端にパイ
プ１６およびランス１５を有するコネクター１４は、回
転テーブル７上の支持台１１中で自転用モーター１２と
図示しないベルトで接続され自転用モーター１２の駆動
により自転するとともに、不活性ガス吹込み口１３の下
端と接続され不活性ガス吹込み口１３に供給される不活
性ガスを溶湯中ヘランス１５から吹込むことが可能であ
る。A rotation motor 12 and an inert gas inlet 13 are provided on the surface of the rotary table 7 via a support 11. The upper and lower ends of the inert gas inlet 13 are configured to be rotatable. Further, an inert gas blowing pipe 16 having an inert gas blowing lance 15 at its tip is provided on the back surface of the rotary table 7 via a connector 14. The connector 14, which has a pipe 16 and a lance 15 at its tip, is connected to an autorotation motor 12 by a belt (not shown) in a support base 11 on the rotary table 7, and is rotated by the rotation motor 12 while being inert gas blown into the connector 14. The inert gas connected to the lower end of the port 13 and supplied to the inert gas blowing port 13 can be blown into the molten metal from the herance 15 .
ランス１５およびパイプ１６は無機質材料特に黒鉛から
なると好ましく、またランス１５のガス吹込み部はパイ
プ１６の中心軸に対して図示のように下方拡がり、換言
すれば上方向きのテーパを設けることにより気泡の粗大
化を防止している。さらに、支持枠４の内部は溶湯１と
面し高温となるため、図示しない耐火物層を設けている
。さらにまた、支持枠４と回転テーブル１２とによりほ
ぼ密閉構造となるため、炉２に装着した状態で炉２の蓋
の役目をも果し、全体として本発明の溶湯処理装置を構
成している。The lance 15 and the pipe 16 are preferably made of an inorganic material, particularly graphite, and the gas injection part of the lance 15 expands downward as shown in the figure with respect to the central axis of the pipe 16. In other words, by providing an upward taper, air bubbles are eliminated. This prevents the grain from becoming coarse. Furthermore, since the inside of the support frame 4 faces the molten metal 1 and becomes high temperature, a refractory layer (not shown) is provided. Furthermore, since the support frame 4 and the rotary table 12 form an almost airtight structure, it also serves as a lid for the furnace 2 when attached to the furnace 2, and as a whole constitutes the molten metal processing apparatus of the present invention. .
上述した構成の溶湯処理装置において、実際に溶湯処理
をする場合は、支持枠４を炉２の所定位置に装着しラン
ス１５を溶湯１内に浸漬した状態でガス吹込み口１３か
ら不活性ガスを供給するとともに、公転用モーター１０
および自転用モーター１２を同時に駆動してランス１５
が自転しながら炉心を中心として公転するようにして溶
湯処理を実施している。このとき、自転回転数は１５
ｒｐｍ以下、公転回転数は２ ｒｐｍ以下であると気泡
の分散が効率よ（行なえるため好ましい。In the molten metal processing apparatus configured as described above, when actually processing molten metal, the support frame 4 is installed in a predetermined position of the furnace 2, the lance 15 is immersed in the molten metal 1, and an inert gas is supplied from the gas injection port 13. In addition to supplying the revolution motor 10
and the autorotation motor 12 are simultaneously driven to drive the lance 15.
Molten metal processing is carried out by rotating and revolving around the reactor core. At this time, the rotational speed is 15
rpm or less, and the revolution speed is preferably 2 rpm or less because bubbles can be efficiently dispersed.
第２図（ａ） 、 （ｂ）は本発明の溶湯処理装置の他
の例を示す平面図および部分断面図である。本実施例に
おいて、第１図に示す実施例と同一の部材には同一の符
号を付してその説明を省略する。第２図に示す実施例に
おいて第１図に示す実施例と異なるのは、炉心からの距
離を異ならせた２個の不活性ガス吹込み用ランス１５−
１ 、１５−２をコネクター１４−１ 、１４−２およ
びパイプ１６−１．１６−２を介して回転テーブル７に
装着した点である。FIGS. 2(a) and 2(b) are a plan view and a partial sectional view showing another example of the molten metal processing apparatus of the present invention. In this embodiment, the same members as those in the embodiment shown in FIG. 1 are given the same reference numerals, and their explanations will be omitted. The difference between the embodiment shown in FIG. 2 and the embodiment shown in FIG. 1 is that two inert gas injection lances 15-
1 and 15-2 are attached to the rotary table 7 via connectors 14-1 and 14-2 and pipes 16-1 and 16-2.
各ランス１５−１ 、１５−２の自転は自転用モーター
１２とコネクター１４−１ 、１４−２とをベルト１７
−１゜１７−２により接続することにより行なうととも
に、不活性ガスの吹込みはガス吹込み口１３から供給さ
れる不活性ガスを支持台ｌｌ内で分岐させることにより
ランス１５−１ 、１５−２の両方からガスが吹込まれ
るよう構成している。第２図に示す実施例においては、
溶湯処理時の公転半径がランス毎に異なるため気泡の分
散をより効果的に実施できる。The rotation of each lance 15-1 and 15-2 is achieved by connecting the rotation motor 12 and the connectors 14-1 and 14-2 to the belt 17.
-1° 17-2, and the inert gas is blown into the lances 15-1 and 15-2 by branching the inert gas supplied from the gas inlet 13 within the support base 11. The structure is such that gas is blown from both sides. In the embodiment shown in FIG.
Since the revolution radius during molten metal processing differs for each lance, bubbles can be dispersed more effectively.
以下、実際の例について説明する。An actual example will be explained below.
１−旌一桝
第１図に示す本発明のランスを自転および公転させる溶
湯処理装置と比較例としてランスを炉中央に固定して自
転のみを実施した従来の装置を使用して、第１表に示す
成分のベリリウム銅溶湯を第２表に示す条件で処理した
。1-JiichimasuThe molten metal processing equipment shown in Figure 1, in which the lance of the present invention rotates and revolves, and the conventional equipment, in which the lance is fixed in the center of the furnace and only rotates, are used as a comparative example. Molten beryllium copper having the components shown in Table 2 was treated under the conditions shown in Table 2.
本発明例および比較例における溶湯内の水素ガス濃度の
時間変化を第３図に、またサンプリングした試料の非金
属介在物量の時間変化を第４図に示す。FIG. 3 shows the time change in the hydrogen gas concentration in the molten metal in the inventive examples and comparative examples, and FIG. 4 shows the time change in the amount of nonmetallic inclusions in the sampled samples.
第３図の結果より、比較例において水素ガス濃度を０．
７ ｐｐｍに減少させるのに約１５分必要であったが本
発明例では約７分と半減しているのがわかる。また、第
４図の結果より、介在物量の除去効率が向上しているの
がわかる。From the results shown in Figure 3, the hydrogen gas concentration was reduced to 0.
It can be seen that it took about 15 minutes to reduce the concentration to 7 ppm, but in the example of the present invention, this time was reduced by half to about 7 minutes. Moreover, from the results shown in FIG. 4, it can be seen that the removal efficiency of the amount of inclusions is improved.
本発明は上述した実施例にのみ限定されるものではなく
、幾多の変形、変更が可能である。例えば上述した実施
例では支持枠４を円筒形にして炉２の上部に設けた段部
３に挿入して駆動装置等を炉２の上に固定したが、支持
枠４を四角形等信の形状として炉２の上部に何らかの手
段により固定して載置することもできる。さらに、ラン
ス１５の自転および公転の機構も上述した実施例にのみ
限定されるものではなく、駆動装置によりランス１５が
自転および公転する構造であれば良いことは明らかであ
る。さらにまた、上述した実施例ではランス１５の形状
をテーパ状としたが、従来形状のランスを使用してもそ
の効果があることは明らかである。The present invention is not limited only to the embodiments described above, and numerous modifications and changes are possible. For example, in the embodiment described above, the support frame 4 was made into a cylindrical shape and inserted into the step 3 provided at the top of the furnace 2 to fix the driving device and the like on the furnace 2. It can also be fixedly mounted on the upper part of the furnace 2 by some means. Furthermore, it is clear that the mechanism for the rotation and revolution of the lance 15 is not limited to the above-mentioned embodiments, and any structure may be used as long as the lance 15 is rotated and revolved by the drive device. Furthermore, although the lance 15 has a tapered shape in the above-described embodiment, it is clear that the same effect can be obtained even if a lance of a conventional shape is used.
（発明の効果）
以上詳細に説明したところから明らかなように、本発明
の溶湯処理装置によれば、先端に不活性ガス吹込み用ラ
ンスを設けた不活性ガス吹込みパイプを溶湯処理時に自
転および公転させることにより、不活性ガスが溶湯処理
槽全体に均一微細にいきわたり不活性ガスと溶湯との接
触面積が増大し、有害ガスおよび非金属介在物の除去効
率を飛躍的に向上させることができる。(Effects of the Invention) As is clear from the detailed explanation above, according to the molten metal processing apparatus of the present invention, the inert gas injection pipe provided with the inert gas injection lance at the tip is rotated during molten metal processing. By rotating the tank, the inert gas is distributed uniformly and finely throughout the molten metal processing tank, increasing the contact area between the inert gas and the molten metal, and dramatically improving the removal efficiency of harmful gases and non-metallic inclusions. can.
第１図は本発明の溶湯処理装置の一実施例を示す部分断
面図、
第２図（ａ） 、 （ｂ）は本発明の溶湯処理装置の他
の例を示す平面図および部分断面図、
第３図は本発明例および従来例における処理時間と溶湯
中の水素ガス濃度との関係を示すグラフ、第４図は同じ
く処理時間と溶湯・鋳塊中の非金属介在物量との関係を
示すグラフである。
１・・・溶湯 ２・・・炉３．５・・・
段部 ４・・・支持枠６・・・歯車
７・・・回転テーブル８・・・歯部
９・・・支持プレートｌＯ・・・公転用モータ
ー １１・・・支持台１２・・・自転用モーター
１３・・・不活性ガス吹込み口
１４．１４−１．１４−２・・・コネクター１５、１５
−１．１５−２・・・不活性ガス吹込み用ランス１６、
、１６−１．１６−２・・・不活性ガス吹込みパイプ１
７−１．１７−２・・・ベルト
特許出願人 日本碍子株式会社
代理人弁理士 杉 村 暁 秀同 弁理士
杉 村 興 作ぐ
第３図
肌理時ＨＩ吟〕FIG. 1 is a partial sectional view showing one embodiment of the molten metal processing apparatus of the present invention, FIGS. 2(a) and 2(b) are a plan view and a partial sectional view showing another example of the molten metal processing apparatus of the present invention, Figure 3 is a graph showing the relationship between the treatment time and hydrogen gas concentration in the molten metal in the present invention and the conventional example, and Figure 4 is a graph showing the relationship between the treatment time and the amount of nonmetallic inclusions in the molten metal/ingot. It is a graph. 1... Molten metal 2... Furnace 3.5...
Stepped portion 4...Support frame 6...Gear
7... Rotary table 8... Teeth
9...Support plate lO...Motor for revolution 11...Support stand 12...Motor for rotation 13...Inert gas inlet 14.14-1.14-2...Connector 15 , 15
-1.15-2...Inert gas injection lance 16,
, 16-1.16-2...Inert gas blowing pipe 1
7-1.17-2...Belt patent applicant Nippon Insulator Co., Ltd. Representative Patent Attorney Akatsuki Sugimura Patent Attorney Oki Sugimura Create Figure 3 Texture Time HIgin]
Claims (1)
端にガス吹込み用ランスを設けたガス吹込みパイプと、
ガス吹込みパイプを自転させる自転用駆動装置と、ガス
吹込みパイプを溶湯処理槽の中心に対して公転させる公
転用駆動装置とを具え、ガス吹込みパイプを自転と同時
に公転させながら溶湯を処理することを特徴とする溶湯
処理装置。 ２、前記ガス吹込みパイプが複数であり、各ガス吹込み
パイプが溶湯処理槽の中心に対して異なる半径を有する
よう配置されている特許請求の範囲第１項記載の溶湯処
理装置。 ３、前記ガス吹込み用ランスのガス吹込み部が前記ガス
吹込みパイプの中心軸に対して下方拡がりのテーパを有
する特許請求の範囲第１項記載の溶湯処理装置。[Claims] 1. A molten metal processing tank, a gas blowing pipe that can be inserted into and removed from the molten metal processing tank and has a lance for blowing gas at its tip;
Equipped with an autorotation drive device that rotates the gas injection pipe and a revolution drive device that makes the gas injection pipe revolve around the center of the molten metal processing tank, molten metal is processed while the gas injection pipe rotates and revolves at the same time. A molten metal processing device characterized by: 2. The molten metal processing apparatus according to claim 1, wherein there is a plurality of gas blowing pipes, and each gas blowing pipe is arranged to have a different radius with respect to the center of the molten metal processing tank. 3. The molten metal processing apparatus according to claim 1, wherein the gas blowing portion of the gas blowing lance has a taper expanding downward with respect to the central axis of the gas blowing pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12026387A JPS63286527A (en) | 1987-05-19 | 1987-05-19 | Apparatus for treating molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12026387A JPS63286527A (en) | 1987-05-19 | 1987-05-19 | Apparatus for treating molten metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63286527A true JPS63286527A (en) | 1988-11-24 |
Family
ID=14781880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12026387A Pending JPS63286527A (en) | 1987-05-19 | 1987-05-19 | Apparatus for treating molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63286527A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10126060B2 (en) | 2015-05-01 | 2018-11-13 | Opta Minerals Inc. | Lance drive system |
-
1987
- 1987-05-19 JP JP12026387A patent/JPS63286527A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10126060B2 (en) | 2015-05-01 | 2018-11-13 | Opta Minerals Inc. | Lance drive system |
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