CA1156270A - Nodule collector - Google Patents
Nodule collectorInfo
- Publication number
- CA1156270A CA1156270A CA000371324A CA371324A CA1156270A CA 1156270 A CA1156270 A CA 1156270A CA 000371324 A CA000371324 A CA 000371324A CA 371324 A CA371324 A CA 371324A CA 1156270 A CA1156270 A CA 1156270A
- Authority
- CA
- Canada
- Prior art keywords
- seafloor
- inner frame
- collecting chamber
- outer frame
- cutting blade
- 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
Landscapes
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
NODULE COLLECTOR
Abstract of the Disclosure A nodule collector for deep sea mining includes an outer sledge and an inner sledge disposed in and connected to the outer sledge for trailing movement therewith. The inner sledge is provided with a transversely extending cutting blade, a plurality of jet nozzles arranged along the cutting blade, and a longitu-dinally oriented duct. Then the collector travels across the seafloor, the cutting blade cuts into the seafloor and rises it thereover. The water jet from the nozzles impinges upon the sumit of the risen seafloor so that nodules and sediments at the sumit are carried away by the jet water and introduced through the duct into a collecting chamber provided in the outer sledge. The collecting chamber has a special design to prevent entrance of undesirably large sized nodules thereinto and residence of undesirably small sized nodules and sediments therein. The nodules collected in the collecting chamber are successively transported up to the mining ship for recovery.
Abstract of the Disclosure A nodule collector for deep sea mining includes an outer sledge and an inner sledge disposed in and connected to the outer sledge for trailing movement therewith. The inner sledge is provided with a transversely extending cutting blade, a plurality of jet nozzles arranged along the cutting blade, and a longitu-dinally oriented duct. Then the collector travels across the seafloor, the cutting blade cuts into the seafloor and rises it thereover. The water jet from the nozzles impinges upon the sumit of the risen seafloor so that nodules and sediments at the sumit are carried away by the jet water and introduced through the duct into a collecting chamber provided in the outer sledge. The collecting chamber has a special design to prevent entrance of undesirably large sized nodules thereinto and residence of undesirably small sized nodules and sediments therein. The nodules collected in the collecting chamber are successively transported up to the mining ship for recovery.
Description
115~2~
Background of the Invention This invention relates to an apparatus for the recovery of mineral nodules, especially manganese nodules from the seafloor.
An ocean mining system is generally comprised of a mining ship, a riser and a collector vehicle adapted to travel on the seafloor. Nodules which exist on or partly burried in the seafloor sediments are gathered by the collector and are transported to the mining ship through the riser. Since the mining operation is conducted at depths of several thousand meters, the collector is one of the most important components in the mining system.
Thus, the collector should have a high collecting effici-ency and must be able to continuously and effectively operate for a long period of time. Moreover, the collec-tor should not feed muddy sediments to the riser since otherwise the surface of the ocean would be considerably polluted.
Summary of the Invention It is, therefore, an object of an aspect of the present invention to provide an apparatus which can recover mineral nodules, especlally manganese nodules, from the seafloor with a high collecting efficiency and which can operate for a long period of time without encountering troubles.
An object of an aspect of the present invention isto provide an apparatus of the above-mentioned type, which can selectively recover nodules of desired sizes from the seafloor. ~
1 15~27(~
An aspect of the invention is as follows:
An apparatus for recovering mineral nodules from the seafloor, comprising: an outer frame having a bottom portion formed into a sledge so that said outer frame can travel on the seafloor; an inner frame disposed within said outer frame and having a bottom portion formed into a sledge; a joint member connecting the front end of said inner frame to a leading end portion of said outer frame so that said inner frame may be trailed by said outer frame on the seafloor; a buoyant member provided on said inner frame to prevent said inner frame sinking into the seafloor; a collecting chamber provided at the trailing end of said outer frame; a transversely oriented cutting blade secured to said inner frame and projected from the bottom of said inner frame so that the seafloor surface may be raised by said cutting blade when said outer frame travels on the seafloor; a longitudinally extend-ing duct provided on said inner frame having one end open adjacent to said cutting blade and the other end open adjacent to said collecting chamber; a plurality of transversely arranged jet nozzles secured to said inner frame and adapted to jet water therefrom; said collecting chamber, cutting blade and jet nozzles being so arranged that the summit of the seafloor raised by said cutting blade may be scoured and introduced into said collecting chamber through said duct by water jetted from said nozzle; and a pump member mounted on said outer frame for feeding water to said jet nozzles.
Brief Description of the Drawings Other objects, features and advantages of the present invention will become apparent from the detailed description of 1 15~270 ; preferred embodiments of the pre~ent invention which follows, when considered in light of the accompanying drawings, in which:
Fig. 1 is a partial perspective view, cut away in part, Ischematically showing one embodiment of the nodule collector ,laccording to the present invention;
Fig. 2 is an elevational view explanatory of the collector of Fig. 1; and Fig. 3 is a partial perspective view, cut away in part, l¦schematically showing a collecting chamber of the nodule collector ¦¦of Fig. 1.
¦I Description of the Preferreu Embodiments .
One embodiment of a nodule collector constructed in accordance with the present invention is illustrated in Figs. 1 I'lthrough 3, and reference should be had first to Figs. 1 and 2.
!I The reference numeral 10 denotes an outer frame generally rect-llangular in shape and having a pair of laterally spaced apart ¦Isledges 12 at its underside. Disposed within the outer frame 10 is an inner frame 14 which is also provided with a pair of sledges ,l16 at its suitable underside portions. As can be seen in Fig. 2, 1l the front end of the inner frame 14 is connected to the leading end of the outer frame 10 by means of a jo~nt member, preferably la flexible joint. As a result of this construction, the outer llframe 10 can travel on the seafloor with the inner frame 14 being iltrailed thereby. The inner frame 14 is provided with a buoyant member 20 to control the uncerside level of the inner frame 14 relative to the surface of the seafloor. Good results are obtained wh~n the und~rside of the inn~r frame 14 is maintained in the s~.e level as the seafloor.
A cutting blade 22 extends transversely between opposite sides of the inner frame 14 and is fixed there. As shown in Fig.
Background of the Invention This invention relates to an apparatus for the recovery of mineral nodules, especially manganese nodules from the seafloor.
An ocean mining system is generally comprised of a mining ship, a riser and a collector vehicle adapted to travel on the seafloor. Nodules which exist on or partly burried in the seafloor sediments are gathered by the collector and are transported to the mining ship through the riser. Since the mining operation is conducted at depths of several thousand meters, the collector is one of the most important components in the mining system.
Thus, the collector should have a high collecting effici-ency and must be able to continuously and effectively operate for a long period of time. Moreover, the collec-tor should not feed muddy sediments to the riser since otherwise the surface of the ocean would be considerably polluted.
Summary of the Invention It is, therefore, an object of an aspect of the present invention to provide an apparatus which can recover mineral nodules, especlally manganese nodules, from the seafloor with a high collecting efficiency and which can operate for a long period of time without encountering troubles.
An object of an aspect of the present invention isto provide an apparatus of the above-mentioned type, which can selectively recover nodules of desired sizes from the seafloor. ~
1 15~27(~
An aspect of the invention is as follows:
An apparatus for recovering mineral nodules from the seafloor, comprising: an outer frame having a bottom portion formed into a sledge so that said outer frame can travel on the seafloor; an inner frame disposed within said outer frame and having a bottom portion formed into a sledge; a joint member connecting the front end of said inner frame to a leading end portion of said outer frame so that said inner frame may be trailed by said outer frame on the seafloor; a buoyant member provided on said inner frame to prevent said inner frame sinking into the seafloor; a collecting chamber provided at the trailing end of said outer frame; a transversely oriented cutting blade secured to said inner frame and projected from the bottom of said inner frame so that the seafloor surface may be raised by said cutting blade when said outer frame travels on the seafloor; a longitudinally extend-ing duct provided on said inner frame having one end open adjacent to said cutting blade and the other end open adjacent to said collecting chamber; a plurality of transversely arranged jet nozzles secured to said inner frame and adapted to jet water therefrom; said collecting chamber, cutting blade and jet nozzles being so arranged that the summit of the seafloor raised by said cutting blade may be scoured and introduced into said collecting chamber through said duct by water jetted from said nozzle; and a pump member mounted on said outer frame for feeding water to said jet nozzles.
Brief Description of the Drawings Other objects, features and advantages of the present invention will become apparent from the detailed description of 1 15~270 ; preferred embodiments of the pre~ent invention which follows, when considered in light of the accompanying drawings, in which:
Fig. 1 is a partial perspective view, cut away in part, Ischematically showing one embodiment of the nodule collector ,laccording to the present invention;
Fig. 2 is an elevational view explanatory of the collector of Fig. 1; and Fig. 3 is a partial perspective view, cut away in part, l¦schematically showing a collecting chamber of the nodule collector ¦¦of Fig. 1.
¦I Description of the Preferreu Embodiments .
One embodiment of a nodule collector constructed in accordance with the present invention is illustrated in Figs. 1 I'lthrough 3, and reference should be had first to Figs. 1 and 2.
!I The reference numeral 10 denotes an outer frame generally rect-llangular in shape and having a pair of laterally spaced apart ¦Isledges 12 at its underside. Disposed within the outer frame 10 is an inner frame 14 which is also provided with a pair of sledges ,l16 at its suitable underside portions. As can be seen in Fig. 2, 1l the front end of the inner frame 14 is connected to the leading end of the outer frame 10 by means of a jo~nt member, preferably la flexible joint. As a result of this construction, the outer llframe 10 can travel on the seafloor with the inner frame 14 being iltrailed thereby. The inner frame 14 is provided with a buoyant member 20 to control the uncerside level of the inner frame 14 relative to the surface of the seafloor. Good results are obtained wh~n the und~rside of the inn~r frame 14 is maintained in the s~.e level as the seafloor.
A cutting blade 22 extends transversely between opposite sides of the inner frame 14 and is fixed there. As shown in Fig.
2, the cut'ing blade 22 is protruded ~rom the bottom surface of ; the inner frame 14 and is oriented such that when the inner frame 1 14 moves forward, i. e. in the direction shown by the arrow X, the cutting blade 22 c~n cut into the seafloor and rise it thereover.
I Preferably, the angle of inclination e of the cutting blade 22 1 is 60 or more.
In front of the cutting blade 22, a plurality of nozzles 24 are located. The nozzles 24 are supported to the inner frame 14 and their heads are generally laterally aligned along the ' transversely oriented cutting blade 22. The nozzles 24 are adapted to jet water in directions so that the jet water may impinge on the sumit of the seafloor surface risen by the cutting blade 22.
~iounted on the outer frame 10 is a pump 26 for feeding water to the nozzles 24. The nozzles 24 are connected to pipes 28 branched from a pipe 30 connected to the exhaust port of the pump 26. The inta~e port of the pump 26 is connected to a pipe 32 which opens at its free end to the leading end of the outer frame !
10. The pump 26 is operated by a driving means 34 mounted on the outer frame 10.
The inner frame 14 has a duct 36 longitudinally disposed therein. As can be seen in Fig. 2, one end of the duct 36 is opened to recei~e water jet from the nozzles 24 while the other 1 15~270 end ther~of` op~ns ~dJacently to a collection chamber 38 formed in the trai].ing end of the outer frame 10.
In order to minimize tne loss in velocity of the jet flows within the duct 36, the duct is oriented in the same 5 1l direction as that of water jet from the nozzles 24.
One embodiment of the collection chamber 38 is illust- !
f rated in Fig. 3. The collection cha~lber 38 has a front side 40 formed of a net member and serving as oversize rejection screen.
l The mesh size of the oversize rejection screen 40 is selected so that the screen 40 may prevent passage therethrough of substances whose sizes are larger that a desired upper size, e. g. larger than 80 mm. The opposite side 42 and upper side 44 of the collecting chamber 38 are also formed of a net member and serve as Iseparation screen. The separation screen 42 and 44 has a mesh lS '~size finer than the rejection screen 40 and allows passage there-',through of substances having smaller sizes than a desired lower ~limit, e. g. smaller than 5 mm.
Disposed transversely at the bottom of the collecting ,chamber 38 is a screw conveyor 46 which is rotatingly driven by a ~motor 48. By rotation of the screw 46, the nodules collected at 'the bottom of the collecting chamber 38 are conveyed in the direction indicated by the arrow Y. A riser pipe 50 extends . i downward into the collecting chamber 38 and terminates near the ~ bottom of the chamber 38. At the bottom of the chamber 38, a ,'nozzle 52 is mounted in vertical alingment with the riser pipe 50. The nozzle 52 is supplied with water from the pump 26 through a connecting pipe 54 branched from the pipe 30. The other end of the riser pipe 50 is connected to a suction pump (not shown) provided on the mining ship. Thus, the nodules 1 15~270 conveyed by the screw 46 can be successively introduced into the riser pipe 50 and transported up to the mining ship by the suction force of the pump on the mining ship as well as pushing force of , the jet water from the nozzle 52.
In operation, the nodule collector is placed on the seafloor and is towed by the mining ship. Any suitable cable may be used for towing the collector by the mining ship. The ¦riser 50 itself can be used for this purpose. When the nodule llcollector travels across the seafloor at a predetermined speed, ~¦for example at one knot, the outer frame 10 is partly burried in ¦the seafloor by gravity. However, the inner frame 14 can travel ¦on the seafloor with its sledges being in contact with and in parallel with the surface of the seafloor, since the inner frame l 14 is provided with the buoyant member 20 and is connected to the 1 outer frame 10 by means of the flexible joint 18. As the collector ¦
is advanced, the cutting blade 22 fixed to the inner frame 14 can cut into the seafloor and rises it thereover. By driving the motor34 of the pump 26, clean sea water is introduced from the ¦intake of the pipe 32 and jetted from the nozzles 24 for the ~limpingement with the apex of the risen seafloor at a speed sufficient to carry the nodules into the collecting chamber 38 through the duct 36. The arrangement and the number of the nozzles 24 may be determined so that uniform ~et flows are established throughout the duct 36.
, Nodules are known to exist partially burried in the cl~yey seafloor sediment. Since~ with the nodule collector according to the present invention, such nodules are tend to be exposed on the surface of ~he seafloor by the rising action of the ;cutting blade 22, the amount of the sediments entralned with the 1 15~270 nodules by the scouring ~ction of the Jet water from the nozzlcs 24 may be minimize~.
j The nodules and sediments removed from the seafloor ~Imove up the inclined duct 36 and substantially all the nodules 5 ll having diameters smaller than the mesh size of the oversize I rejection screen 40 can enter into the collecting chamber 38.
Noaules having too large diameters to pass through the screen 40 are directed down onto the seafloor. The sediments introduced into the collecting chamber 38 together with the nodules are allowed to pass through the separation screen 42 provided opposite to the oversize rejection screen 40 and are discharged out of the collection chamber 38. Also nodules having smaller diameters than the mesh size of the separation screen 42 may be discharged from tne chamber 38, leaving nodules having selected range of diameters.
15 1I The nodules left within the collection chamber 38 are successively displaced transversely by means of the screw conveyor 46 and are introduced into the riser pipe 50 by jet flows from the ¦nozzle 54 and suction force from the riser pipe 50 for trans-l~portation to the mining ship. On the mining ship, the nodules are 1~1 separated from the se~water and recovered.
The nodule collector of this invention is very simple in ¦
structure and is capable of operating for a long period of time without troubles, such as clogging of riser and entra~nment of l¦muddy sediments in the recovered nodules. The combination of ~et !~ nozzles and cutting blade may improve the collecting efficiency ¦of the collector and reduce the amount of muddy or silty sediments !
,introd~ced into the duct.
I, The invention may be embodied in other specific forms I without departing from the spirit or essential characteristics " thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of j ¦ the invention being indicated by the appended claims rather than l by the foregoing description, and all the changes which come 1 within the meaning and range of equivalency of the claims are thereiore intended to be embranced therein iO 1~
l 9
I Preferably, the angle of inclination e of the cutting blade 22 1 is 60 or more.
In front of the cutting blade 22, a plurality of nozzles 24 are located. The nozzles 24 are supported to the inner frame 14 and their heads are generally laterally aligned along the ' transversely oriented cutting blade 22. The nozzles 24 are adapted to jet water in directions so that the jet water may impinge on the sumit of the seafloor surface risen by the cutting blade 22.
~iounted on the outer frame 10 is a pump 26 for feeding water to the nozzles 24. The nozzles 24 are connected to pipes 28 branched from a pipe 30 connected to the exhaust port of the pump 26. The inta~e port of the pump 26 is connected to a pipe 32 which opens at its free end to the leading end of the outer frame !
10. The pump 26 is operated by a driving means 34 mounted on the outer frame 10.
The inner frame 14 has a duct 36 longitudinally disposed therein. As can be seen in Fig. 2, one end of the duct 36 is opened to recei~e water jet from the nozzles 24 while the other 1 15~270 end ther~of` op~ns ~dJacently to a collection chamber 38 formed in the trai].ing end of the outer frame 10.
In order to minimize tne loss in velocity of the jet flows within the duct 36, the duct is oriented in the same 5 1l direction as that of water jet from the nozzles 24.
One embodiment of the collection chamber 38 is illust- !
f rated in Fig. 3. The collection cha~lber 38 has a front side 40 formed of a net member and serving as oversize rejection screen.
l The mesh size of the oversize rejection screen 40 is selected so that the screen 40 may prevent passage therethrough of substances whose sizes are larger that a desired upper size, e. g. larger than 80 mm. The opposite side 42 and upper side 44 of the collecting chamber 38 are also formed of a net member and serve as Iseparation screen. The separation screen 42 and 44 has a mesh lS '~size finer than the rejection screen 40 and allows passage there-',through of substances having smaller sizes than a desired lower ~limit, e. g. smaller than 5 mm.
Disposed transversely at the bottom of the collecting ,chamber 38 is a screw conveyor 46 which is rotatingly driven by a ~motor 48. By rotation of the screw 46, the nodules collected at 'the bottom of the collecting chamber 38 are conveyed in the direction indicated by the arrow Y. A riser pipe 50 extends . i downward into the collecting chamber 38 and terminates near the ~ bottom of the chamber 38. At the bottom of the chamber 38, a ,'nozzle 52 is mounted in vertical alingment with the riser pipe 50. The nozzle 52 is supplied with water from the pump 26 through a connecting pipe 54 branched from the pipe 30. The other end of the riser pipe 50 is connected to a suction pump (not shown) provided on the mining ship. Thus, the nodules 1 15~270 conveyed by the screw 46 can be successively introduced into the riser pipe 50 and transported up to the mining ship by the suction force of the pump on the mining ship as well as pushing force of , the jet water from the nozzle 52.
In operation, the nodule collector is placed on the seafloor and is towed by the mining ship. Any suitable cable may be used for towing the collector by the mining ship. The ¦riser 50 itself can be used for this purpose. When the nodule llcollector travels across the seafloor at a predetermined speed, ~¦for example at one knot, the outer frame 10 is partly burried in ¦the seafloor by gravity. However, the inner frame 14 can travel ¦on the seafloor with its sledges being in contact with and in parallel with the surface of the seafloor, since the inner frame l 14 is provided with the buoyant member 20 and is connected to the 1 outer frame 10 by means of the flexible joint 18. As the collector ¦
is advanced, the cutting blade 22 fixed to the inner frame 14 can cut into the seafloor and rises it thereover. By driving the motor34 of the pump 26, clean sea water is introduced from the ¦intake of the pipe 32 and jetted from the nozzles 24 for the ~limpingement with the apex of the risen seafloor at a speed sufficient to carry the nodules into the collecting chamber 38 through the duct 36. The arrangement and the number of the nozzles 24 may be determined so that uniform ~et flows are established throughout the duct 36.
, Nodules are known to exist partially burried in the cl~yey seafloor sediment. Since~ with the nodule collector according to the present invention, such nodules are tend to be exposed on the surface of ~he seafloor by the rising action of the ;cutting blade 22, the amount of the sediments entralned with the 1 15~270 nodules by the scouring ~ction of the Jet water from the nozzlcs 24 may be minimize~.
j The nodules and sediments removed from the seafloor ~Imove up the inclined duct 36 and substantially all the nodules 5 ll having diameters smaller than the mesh size of the oversize I rejection screen 40 can enter into the collecting chamber 38.
Noaules having too large diameters to pass through the screen 40 are directed down onto the seafloor. The sediments introduced into the collecting chamber 38 together with the nodules are allowed to pass through the separation screen 42 provided opposite to the oversize rejection screen 40 and are discharged out of the collection chamber 38. Also nodules having smaller diameters than the mesh size of the separation screen 42 may be discharged from tne chamber 38, leaving nodules having selected range of diameters.
15 1I The nodules left within the collection chamber 38 are successively displaced transversely by means of the screw conveyor 46 and are introduced into the riser pipe 50 by jet flows from the ¦nozzle 54 and suction force from the riser pipe 50 for trans-l~portation to the mining ship. On the mining ship, the nodules are 1~1 separated from the se~water and recovered.
The nodule collector of this invention is very simple in ¦
structure and is capable of operating for a long period of time without troubles, such as clogging of riser and entra~nment of l¦muddy sediments in the recovered nodules. The combination of ~et !~ nozzles and cutting blade may improve the collecting efficiency ¦of the collector and reduce the amount of muddy or silty sediments !
,introd~ced into the duct.
I, The invention may be embodied in other specific forms I without departing from the spirit or essential characteristics " thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of j ¦ the invention being indicated by the appended claims rather than l by the foregoing description, and all the changes which come 1 within the meaning and range of equivalency of the claims are thereiore intended to be embranced therein iO 1~
l 9
Claims (6)
1. An apparatus for recovering mineral nodules from the seafloor, comprising: an outer frame having a bottom portion formed into a sledge so that said outer frame can travel on the seafloor; an inner frame disposed within said outer frame and having a bottom portion formed into a sledge; a joint member connecting the front end of said inner frame to a leading end portion of said outer frame so that said inner frame may be trailed by said outer frame on the seafloor; a buoyant member provided on said inner frame to prevent said inner frame sinking into the seafloor; a collecting chamber provided at the trailing end of said outer frame; a transversely oriented cutting blade secured to said inner frame and projected from the bottom of said inner frame so that the seafloor surface may be raised by said cutting blade when said outer frame travels on the seafloor; a longitudinally extend-ing duct provided on said inner frame having one end open adjacent to said cutting blade and the other end open adjacent to said collecting chamber; a plurality of transversely arranged jet nozzles secured to said inner frame and adapted to jet water therefrom; said collecting chamber, cutting blade and jet nozzles being so arranged that the summit of the seafloor raised by said cutting blade may be scoured and introduced into said collecting chamber through said duct by water jetted from said nozzle; and a pump member mounted on said outer frame for feeding water to said jet nozzles.
2. An apparatus as set forth in claim 1, wherein said joint member is a flexible joint so that vertical movement of said inner frame is independent from the movement of said outer frame.
3. An apparatus as set forth in claim 1, wherein said duct is oriented substantially in the same direction as the jet direction from said nozzles.
4. An apparatus as set forth in claim 1, further comprising a conveyor means provided within said collecting chamber for conveying nodules collected on the bottom of said collecting chamber to a nodule discharge port.
5. An apparatus as set forth in claim 4, further comprising a vertically oriented jet nozzle provided opposite to said discharge port and adapted to jet water therefrom for facilitating discharge of the nodules from said dis-charge port.
6. An apparatus as set forth in claim 1, wherein said collecting chamber comprises an oversize rejection screen facing the open end of said duct and formed of a first net member, and a separation screen arranged opposite to said oversize rejection screen and formed of a second net member, the mesh size of said first net member being greater than said second net member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21406/1980 | 1980-02-22 | ||
| JP2140680A JPS56119095A (en) | 1980-02-22 | 1980-02-22 | Device for collecting mineral nodule distributing on surface of deposit layer of sea bottom |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1156270A true CA1156270A (en) | 1983-11-01 |
Family
ID=12054155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000371324A Expired CA1156270A (en) | 1980-02-22 | 1981-02-20 | Nodule collector |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS56119095A (en) |
| CA (1) | CA1156270A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017021708A3 (en) * | 2015-07-31 | 2017-03-16 | Rotech Group Limited | Separator apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60117014U (en) * | 1984-01-18 | 1985-08-07 | 三菱重工業株式会社 | Tool head for deep hole machining |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3802740A (en) * | 1972-12-21 | 1974-04-09 | Int Nickel Co | Concentration of minerals |
| JPS5243704A (en) * | 1975-10-02 | 1977-04-06 | Sumitomo Metal Mining Co | Device for picking up ore on water bottom |
-
1980
- 1980-02-22 JP JP2140680A patent/JPS56119095A/en active Granted
-
1981
- 1981-02-20 CA CA000371324A patent/CA1156270A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017021708A3 (en) * | 2015-07-31 | 2017-03-16 | Rotech Group Limited | Separator apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5740320B2 (en) | 1982-08-26 |
| JPS56119095A (en) | 1981-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |