CN113355485A - Spray gun replacing device for molten iron desulphurization and use method thereof - Google Patents
Spray gun replacing device for molten iron desulphurization and use method thereof Download PDFInfo
- Publication number
- CN113355485A CN113355485A CN202110562530.5A CN202110562530A CN113355485A CN 113355485 A CN113355485 A CN 113355485A CN 202110562530 A CN202110562530 A CN 202110562530A CN 113355485 A CN113355485 A CN 113355485A
- Authority
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- China
- Prior art keywords
- spray gun
- swing rod
- molten iron
- sliding seat
- quick
- 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
- 239000007921 spray Substances 0.000 title claims abstract description 98
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 7
- 230000023556 desulfurization Effects 0.000 claims description 7
- 230000003009 desulfurizing effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention belongs to the technical field of ferrous metallurgy molten iron desulphurization production, and particularly relates to a spray gun replacing device for molten iron desulphurization and a using method thereof, which are characterized by comprising a base, a rotating frame, a rotary servo motor, a replacing operation mechanism and a control system, wherein the rotating frame is arranged in the middle of the top of the base, a bearing is arranged between the rotating frame and the base, and the servo motor is vertically arranged at the bottom of the base; the replacing operation mechanism comprises a sliding seat, a walking motor, an operating hand, a guide groove beam, a connecting rod, a swing rod and a swing rod motor, wherein the bottom of the sliding seat is provided with the walking wheel, the walking wheel is connected with the walking motor through a belt or chain transmission, the top of the sliding seat is provided with the swing rod motor, and the swing rod motor is hinged with the bottom of the operating hand through the swing rod and the connecting rod in sequence; when the swing rod motor rotates, the operating hand horizontally slides back and forth along the guide groove beam and is provided with a U-shaped front end. Compared with the prior art, the invention has the beneficial effects that: the operating efficiency of the molten iron desulphurization spray gun is improved and the operating intensity is reduced.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy molten iron desulphurization production, and particularly relates to a spray gun replacing device for molten iron desulphurization and a using method thereof.
Background
The pre-desulfurization of molten iron is one of the indispensable processes for optimizing the metallurgical production process, and can reduce the coke ratio of continuous steel casting/iron making, improve the productivity, reduce the lime consumption and slag amount of steel making, and the like, thereby reducing the production cost. The molten iron pretreatment process for removing sulfur in molten iron before the molten iron enters a steel making furnace for smelting is also called molten iron external desulfurization. The traditional blast furnace continuous steel casting/iron making-converter steel making process is difficult to remove sulfur in molten iron, and high-quality low-sulfur steel can be produced only by adding a molten iron pre-desulfurization process before steel making and adding an external refining process after steel making. The spray gun is used in molten iron powder injection desulfurization and molten iron rotary desulfurization, the traditional replacement mode of the spray gun is mainly that the operation is replaced by pure workers, the special equipment is not replaced by the spray gun, and the gun replacement operation is high in intensity and low in efficiency.
The invention patent of the invention in China with the application number of 201810636234.3 discloses a molten iron desulfurization spray gun replacing device, which comprises a frame assembly, a compression roller, a side guide roller, a carrier roller, a moving arm and a hydraulic cylinder, wherein the compression roller, the side guide roller and the carrier roller are arranged on the frame assembly, the moving arm runs among the compression roller, the side guide roller and the carrier roller, the hydraulic cylinder is installed on the frame assembly, a piston rod of the hydraulic cylinder is hinged with the moving arm, a notch is formed in the front end of the moving arm, and the notch is matched with the diameter of a spray gun pipe. After the device is put into production, the device can help workers to simply and efficiently complete spray gun replacement operation. The connection of spray gun and rotary lifting device still remains flange and bolt in this scheme, inevitably influences the efficiency of changing, and degree of automation is low, still has the needs of further improvement.
Disclosure of Invention
The invention aims to provide a spray gun replacing device for molten iron desulphurization and a using method thereof, which overcome the defects of the prior art, use the replacing device with higher automation degree to replace the spray gun, improve the operating efficiency of the molten iron desulphurization spray gun and reduce the operating intensity, can be provided with a plurality of spray guns at one time, reserve at least one empty gun position, realize automatic replacement and storage and improve the utilization rate of the device.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the technical scheme is as follows: a spray gun replacing device for molten iron desulphurization is characterized by comprising a base, a rotating frame, a rotary servo motor, a replacing operation mechanism and a control system, wherein the rotating frame is arranged in the middle of the top of the base; the replacement operating mechanism comprises a sliding seat, a walking motor, an operating handle, a guide groove beam, a connecting rod, a swing rod and a swing rod motor, wherein the walking wheel is arranged at the bottom of the sliding seat and is connected with the walking motor through a belt or chain transmission, the swing rod motor is arranged at the top of the sliding seat, and the swing rod motor is hinged with the bottom of the operating handle through the swing rod and the connecting rod in sequence; when the swing rod motor rotates, the operating hand horizontally slides back and forth along the guide groove beam, and the operating hand is provided with a U-shaped front end; the sliding seat is fixedly connected with the guide groove beam through a bracket.
Furthermore, the travelling wheels are matched with the guide rails, travel switches are respectively arranged at the front ends and the rear ends of the guide rails, and the travel switches are connected with the control system.
Furthermore, a plurality of U-shaped spray gun hanging racks are uniformly arranged on the outer edge of the rotating frame in the circumferential direction, and U-shaped openings of the U-shaped spray gun hanging racks are outward along the radial direction.
Further, with the supporting spray gun structure of U-shaped spray gun stores pylon includes the rifle body and is located the canned paragraph at rifle body top, and the canned paragraph is equipped with centre gripping pipeline section, upper ring circle and lower ring from top to bottom in proper order, the upper ring circle matches with the U-shaped spray gun stores pylon, the lower ring circle matches with the U-shaped front end of operative employee, the centre gripping pipeline section matches with the quick change (holding) chuck on the spray gun rotary drive mechanism.
Further, the quick-change chuck is a three-jaw or four-jaw chuck for a machine tool.
The second technical proposal is that: a use method of a spray gun replacing device for molten iron desulphurization comprises the following specific steps:
1) before the replacement operation of the spray gun is started, the spray gun rotary driving mechanism lifts the old spray gun to a gun replacement position;
2) the rotating frame is driven by the rotary servo motor to rotate to an empty gun position for collecting the old spray gun;
3) the slide seat moves forwards under the driving of the walking motor until the U-shaped front end of an operator supports the lower ring of the old spray gun, the quick-change chuck is opened, and the spray gun rotation driving mechanism drives the quick-change chuck to ascend until a clamping pipe section is separated from the quick-change chuck;
4) the sliding seat carries the old spray gun to move backwards until an upper ring of the old spray gun and a U-shaped spray gun hanging frame at an empty gun position are in place, the swing rod motor rotates to enable the manipulator to move backwards until the old spray gun is transferred onto the rotating frame, and the swing rod motor stops rotating;
5) the rotating frame rotates to a new spray gun position, the swing rod motor rotates reversely to enable the operator to move forwards, a new spray gun is picked up, the sliding seat moves forwards, the new spray gun reaches the position below the quick-change clamp, and the sliding seat stops moving;
6) the spray gun rotation driving mechanism drives the quick-change chuck to fall down until the clamping pipe section enters the quick-change chuck, and an operator clamps the quick-change chuck tightly by using an electric torque wrench;
7) and the sliding seat moves backwards to reset and waits for the next replacement instruction of the control system.
Furthermore, an angle encoder or a circular grating encoder is arranged on the rotary servo motor.
Furthermore, a front limit switch and a rear limit switch are arranged on the guide groove beam, and the limit switches are connected with the control system and realize interlocking control with the swing rod motor.
Compared with the prior art, the invention has the beneficial effects that: 1) the operation automation degree is high, the operation efficiency of the molten iron desulphurization spray gun is improved, and the operation intensity is reduced. 2) The molten iron desulphurization spray gun replacing device has the advantages of reasonable design, compact structure, space saving and easy maintenance. After the spray gun is put into production, workers can be helped to simply and efficiently complete the spray gun replacement operation, and the automation degree is higher; 3) a plurality of spray gun positions and an empty gun position rotate under rotary servo motor's location, can realize automatic change and accomodate, and general spray gun is used 3 days, and a set of spray gun is whole to be used up and needs 15~20 days, has improved the device utilization ratio, has reduced the frequent handling operation of new and old spray gun.
Drawings
FIG. 1 is a schematic structural diagram of a use state of an embodiment of the present invention;
FIG. 2 is a schematic view of a connection structure of a spray gun and a quick-change chuck in an embodiment of the invention;
FIG. 3 is a schematic view of a replacement operating mechanism in an embodiment of the present invention;
fig. 4 is a schematic diagram of a distribution structure of U-shaped spray gun hangers on a rotating rack according to an embodiment of the invention.
In the figure: 1-base, 2-rotary frame, 3-rotary servo motor, 4-replacement operating mechanism, 5-bearing, 6-sliding base, 7-walking motor, 8-manipulator, 9-guide channel beam, 10-connecting rod, 11-swing rod, 12-swing rod motor, 13-walking wheel, 14-U-shaped front end, 15-guide rail, 16-travel switch, 17-U-shaped spray gun hanging frame, 18-gun body, 19-fixed section, 20-quick-change chuck, 21-old spray gun, 22-spray gun rotary driving mechanism, 23-limit switch, 24-two-layer platform, 25-bracket, 191-clamping pipe section, 192-upper ring and 193-lower ring.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples:
in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-4, the schematic structural diagram of the using state of the embodiment of the spray gun replacing device for molten iron desulphurization of the present invention includes a base 1, a rotating frame 2, a rotating servo motor 3, a replacing operation mechanism 4 and a control system, wherein the rotating frame 2 is arranged in the middle of the top of the base 1, a bearing 5 is arranged between the rotating frame 2 and the base 1, the rotating servo motor 3 is vertically arranged at the bottom of the base 1, the shaft end of the rotating servo motor 3 is fixedly connected with the rotating frame 2, and the device is arranged on a two-layer platform 24 of the conventional molten iron desulphurization injection operation and is matched with a spray gun rotation driving mechanism 22 to complete the replacing operation of the spray gun.
The replacement operating mechanism 4 comprises a sliding seat 6, a walking motor 7, an operating hand 8, a guide groove beam 9, a connecting rod 10, a swing rod 11 and a swing rod motor 12, wherein the bottom of the sliding seat 6 is provided with the walking wheel 13, the walking wheel 13 is connected with the walking motor 7 through belt transmission, the top of the sliding seat 6 is provided with the swing rod motor 12, and the swing rod motor 12 is hinged with the bottom of the operating hand 8 through the swing rod 11 and the connecting rod 10 in sequence; when the swing rod motor 12 rotates, the operating hand 8 horizontally slides back and forth along the guide groove beam 9, and the operating hand 8 is provided with a U-shaped front end 14; the sliding seat 6 is fixedly connected with the guide groove beam 9 through a bracket 25, and the structure is a crank connecting rod mechanism, so that the horizontal reciprocating movement of an operator can be realized, and the functions of picking and placing the spray gun are completed.
The traveling wheels 13 are matched with the guide rails 15, the front ends and the rear ends of the guide rails 15 are respectively provided with a travel switch 16, the travel switches 16 are connected with a control system, and the travel switches 16 are safe and protected to prevent derailment accidents.
The outer edge of the rotating frame 2 is uniformly provided with a plurality of U-shaped spray gun hanging frames 17 around the circumferential direction, and the U-shaped openings of the U-shaped spray gun hanging frames are outward along the radial direction, so that the spray gun can be conveniently assembled and disassembled.
The spray gun structure matched with the U-shaped spray gun hanging frame 17 comprises a gun body 18 and a fixing section 19 located at the top of the gun body, wherein the fixing section 19 is sequentially provided with a clamping pipe section 191, an upper ring 192 and a lower ring 193 from top to bottom, the upper ring 192 is matched with the U-shaped spray gun hanging frame 17, the lower ring 193 is matched with the U-shaped front end 14 of the operating hand 8, and the clamping pipe section 191 is matched with a quick-change chuck 20 on a spray gun rotation driving mechanism 22. Compared with the existing structure, the gun body obviously improves the functions of clamping and positioning, and has more reasonable structure and better effect.
The quick-change chuck 20 is a three-jaw or four-jaw chuck for a machine tool, and compared with a flange bolt structure, the quick-change chuck can realize quick clamping.
A use method of a spray gun replacing device for molten iron desulphurization comprises the following specific steps:
1) before the replacement of the spray gun, the spray gun rotary driving mechanism 22 lifts the old spray gun 21 to a gun replacement position;
2) the rotating frame 2 is driven by the rotary servo motor 3 to rotate to an empty gun position for collecting the old spray gun 21;
3) the slide carriage 6 moves forward under the driving of the walking motor 7 until the U-shaped front end 14 of the manipulator 8 supports the lower ring 193 of the old spray gun 21, the quick-change chuck 20 is opened, and the spray gun rotation driving mechanism 22 drives the quick-change chuck 20 to ascend until the clamping pipe section 191 is separated from the quick-change chuck 20;
4) the slide carriage 6 carries the old spray gun 21 to move backwards until an upper ring 192 of the old spray gun 21 and the U-shaped spray gun hanging frame 17 at the empty gun position are in place, the swing rod motor 12 rotates to enable the operating hand 8 to move backwards until the old spray gun 21 is transferred onto the rotating frame 2, and the swing rod motor 12 stops;
5) the rotating frame 2 rotates to a new spray gun position, the swing rod motor 12 rotates reversely to enable the operating hand 8 to move forwards, a new spray gun is picked up, the sliding seat 6 moves forwards, the new spray gun is carried to the position below the quick-change clamp, and the sliding seat 6 stops moving;
6) the spray gun rotation driving mechanism 22 drives the quick-change chuck 20 to fall down until the clamping pipe section 191 enters the quick-change chuck 20, and an operator clamps the quick-change chuck 20 by using an electric torque wrench;
7) the slide 6 moves backwards and resets to wait for the next replacement instruction of the control system.
Be equipped with angle encoder or circle grating encoder on the rotary servo motor 3, can be used to realize the accurate control of the angle of swivel mount, conveniently change operating device's automatic operation location.
The guide groove beam 9 is provided with a front limit switch 23 and a rear limit switch 23, the limit switches 23 are connected with the control system and realize interlocking control with the swing rod motor 12, and the safety measure is to prevent an operator from deviating from the guide groove beam 9 to cause accidents.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and its inventive concept within the technical scope of the present invention.
Claims (8)
1. A spray gun replacing device for molten iron desulphurization is characterized by comprising a base, a rotating frame, a rotary servo motor, a replacing operation mechanism and a control system, wherein the rotating frame is arranged in the middle of the top of the base; the replacement operating mechanism comprises a sliding seat, a walking motor, an operating handle, a guide groove beam, a connecting rod, a swing rod and a swing rod motor, wherein the walking wheel is arranged at the bottom of the sliding seat and is connected with the walking motor through a belt or chain transmission, the swing rod motor is arranged at the top of the sliding seat, and the swing rod motor is hinged with the bottom of the operating handle through the swing rod and the connecting rod in sequence; when the swing rod motor rotates, the operating hand horizontally slides back and forth along the guide groove beam, and the operating hand is provided with a U-shaped front end; the sliding seat is fixedly connected with the guide groove beam through a bracket.
2. The apparatus of claim 1, wherein the traveling wheels are matched with the guide rails, and travel switches are respectively provided at the front and rear ends of the guide rails and connected with the control system.
3. The replacement apparatus for the desulfurizing lance defined in claim 1, wherein the outer periphery of the rotating frame is provided with a plurality of U-shaped lance holders uniformly arranged around the circumference thereof with U-shaped openings directed radially outward.
4. The replacement device of the molten iron desulphurization spray gun according to claim 3, wherein the spray gun structure matched with the U-shaped spray gun hanging rack comprises a gun body and a fixed section positioned at the top of the gun body, the fixed section is sequentially provided with a clamping pipe section, an upper ring and a lower ring from top to bottom, the upper ring is matched with the U-shaped spray gun hanging rack, the lower ring is matched with the U-shaped front end of an operator, and the clamping pipe section is matched with a quick-change chuck plate on a spray gun rotation driving mechanism.
5. The replacement apparatus for the molten iron desulphurization lance defined in claim 4, wherein the quick-change chuck is a three-jaw or four-jaw chuck for a machine tool.
6. The use method of the spray gun replacing device for molten iron desulphurization is characterized by comprising the following specific steps:
1) before the replacement operation of the spray gun, the spray gun rotary driving mechanism lifts the old spray gun to a gun replacement position;
2) the rotating frame is driven by the rotary servo motor to rotate to an empty gun position for collecting the old spray gun;
3) the slide seat moves forwards under the driving of the walking motor until the U-shaped front end of an operator supports the lower ring of the old spray gun, the quick-change chuck is opened, and the spray gun rotation driving mechanism drives the quick-change chuck to ascend until a clamping pipe section is separated from the quick-change chuck;
4) the sliding seat carries the old spray gun to move backwards until an upper ring of the old spray gun and a U-shaped spray gun hanging frame at an empty gun position are in place, the swing rod motor rotates to enable the manipulator to move backwards until the old spray gun is transferred onto the rotating frame, and the swing rod motor stops;
5) the rotating frame rotates to a new spray gun position, the swing rod motor rotates reversely to enable the operator to move forwards, a new spray gun is picked up, the sliding seat moves forwards, the new spray gun is carried to the position below the quick-change clamp, and the sliding seat stops moving;
6) the spray gun rotation driving mechanism drives the quick-change chuck to fall down until the clamping pipe section enters the quick-change chuck, and an operator clamps the quick-change chuck tightly by using an electric torque wrench;
7) and the sliding seat moves backwards to reset and waits for the next replacement instruction of the control system.
7. The use method of the replacement device for the lance for molten iron desulfurization according to claim 6, wherein the rotary servo motor is provided with an angle encoder or a circular grating encoder.
8. The use method of the lance replacing device for molten iron desulphurization according to claim 6, wherein the guide channel beam is provided with a front limit switch and a rear limit switch, and the limit switches are connected with a control system and realize interlocking control with a swing rod motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110562530.5A CN113355485A (en) | 2021-05-24 | 2021-05-24 | Spray gun replacing device for molten iron desulphurization and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110562530.5A CN113355485A (en) | 2021-05-24 | 2021-05-24 | Spray gun replacing device for molten iron desulphurization and use method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113355485A true CN113355485A (en) | 2021-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110562530.5A Pending CN113355485A (en) | 2021-05-24 | 2021-05-24 | Spray gun replacing device for molten iron desulphurization and use method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN113355485A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9702507D0 (en) * | 1997-02-07 | 1997-03-26 | Kvaerner Davy Ltd | Oxygen lance for steel conversion |
| US20060180683A1 (en) * | 2005-02-14 | 2006-08-17 | Joseph Simms | Replacing a valve seat of an airless paint spray gun |
| CN205852118U (en) * | 2016-06-17 | 2017-01-04 | 中冶宝钢技术服务有限公司 | Oxygen Lance Nozzle for Converter replacing special purpose device |
| CN107140313A (en) * | 2017-07-05 | 2017-09-08 | 中冶华天工程技术有限公司 | A kind of magnesia spray gun is deposited and more changing device and application method automatically |
| CN108866275A (en) * | 2018-06-20 | 2018-11-23 | 鞍钢集团工程技术有限公司 | A kind of molten iron desulfuring spray gun more changing device and its application method |
-
2021
- 2021-05-24 CN CN202110562530.5A patent/CN113355485A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9702507D0 (en) * | 1997-02-07 | 1997-03-26 | Kvaerner Davy Ltd | Oxygen lance for steel conversion |
| US20060180683A1 (en) * | 2005-02-14 | 2006-08-17 | Joseph Simms | Replacing a valve seat of an airless paint spray gun |
| CN205852118U (en) * | 2016-06-17 | 2017-01-04 | 中冶宝钢技术服务有限公司 | Oxygen Lance Nozzle for Converter replacing special purpose device |
| CN107140313A (en) * | 2017-07-05 | 2017-09-08 | 中冶华天工程技术有限公司 | A kind of magnesia spray gun is deposited and more changing device and application method automatically |
| CN108866275A (en) * | 2018-06-20 | 2018-11-23 | 鞍钢集团工程技术有限公司 | A kind of molten iron desulfuring spray gun more changing device and its application method |
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Application publication date: 20210907 |