CN112427611A - Fixed diameter nozzle replacement pouring device and fixed diameter nozzle pouring method - Google Patents
Fixed diameter nozzle replacement pouring device and fixed diameter nozzle pouring method Download PDFInfo
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- CN112427611A CN112427611A CN202011164644.6A CN202011164644A CN112427611A CN 112427611 A CN112427611 A CN 112427611A CN 202011164644 A CN202011164644 A CN 202011164644A CN 112427611 A CN112427611 A CN 112427611A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 84
- 230000007246 mechanism Effects 0.000 claims abstract description 26
- 238000009749 continuous casting Methods 0.000 claims abstract description 14
- 238000004513 sizing Methods 0.000 claims abstract 3
- 238000005266 casting Methods 0.000 claims description 40
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 238000007654 immersion Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 230000009471 action Effects 0.000 description 6
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/08—Accessories for starting the casting procedure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/56—Means for supporting, manipulating or changing a pouring-nozzle
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a fixed diameter nozzle replacing and pouring device and a fixed diameter nozzle opening and pouring method, belonging to the technical field of continuous casting, wherein the fixed diameter nozzle replacing and pouring device comprises an upper nozzle, an immersion nozzle, a first slide rail, a lower nozzle and a driving mechanism, which are connected with a tundish, the two lower nozzles have different apertures and are in sliding connection with the first slide rail, and the upper end of each lower nozzle is in close contact and communicated with the lower end of the upper nozzle when sliding to the lower part of the upper nozzle; the submerged nozzle is positioned below the lower nozzle, and the upper end of the submerged nozzle is tightly contacted and communicated with the lower nozzle communicated with the lower end of the upper nozzle; the driving mechanism is connected with the two lower water gaps and used for pushing the lower water gaps to move along the first sliding rail so as to select one of the lower water gaps to be communicated with the upper water gap and the submerged nozzle. The fixed diameter nozzle opening method firstly pours through the lower nozzle with smaller aperture, and after stabilization, the lower nozzle with larger aperture is replaced on line for pouring. The sizing nozzle replacement pouring device and the sizing nozzle opening pouring method provided by the invention improve the production efficiency.
Description
Technical Field
The invention belongs to the technical field of continuous casting, and particularly relates to a fixed diameter nozzle replacement pouring device and a fixed diameter nozzle opening pouring method.
Background
At present, continuous casting production modes with high drawing speed are increasingly popular, and the drawing speed in the continuous steel casting process greatly influences the yield, so that the cost is indirectly influenced. When the existing high-pulling-speed continuous casting machine is used for continuous casting and casting, molten steel in a tundish flows out from a water gap with a fixed aperture, and the molten steel enters a crystallizer from an immersion water gap. In the casting process, if a water gap with a larger aperture is adopted, the casting speed is not too high because the initial casting stage is unstable, and the crystallizer is easy to risk steel because the casting speed is lower because the aperture is larger. Therefore, the water gap with smaller aperture is always adopted in the existing production process. When the casting blank is stable, the pulling speed is limited due to the small aperture of the water gap, and if the pulling speed is high, the pulling-off phenomenon is easy to generate; if the original pulling speed is always kept, the production efficiency is influenced.
Disclosure of Invention
The invention aims to provide a fixed diameter nozzle replacement pouring device and a fixed diameter nozzle pouring method, and aims to solve the problems that when the existing high-casting-speed continuous casting pouring is carried out, a nozzle with a smaller aperture is always adopted for pouring, the casting speed is limited, and the production efficiency is influenced.
In order to achieve the purpose, the invention adopts the technical scheme that: the fixed diameter nozzle replacement pouring device comprises an upper nozzle, an immersion nozzle, a first slide rail, a lower nozzle and a driving mechanism, wherein the upper nozzle is connected with a tundish; the two lower water gaps have different apertures and are both connected with the first slide rail in a sliding way, and the upper end of each lower water gap is closely contacted and communicated with the lower end of the upper water gap when sliding to the position below the upper water gap; the submerged nozzle is positioned below the lower nozzle, the upper end of the submerged nozzle is tightly contacted and communicated with the lower nozzle communicated with the lower end of the upper nozzle, and the lower part of the submerged nozzle is used for extending into the crystallizer; the driving mechanism is respectively connected with the two lower water gaps and used for pushing the lower water gaps to move along the first slide rail so as to select one of the lower water gaps to be communicated with the upper water gap and the submerged nozzle.
As another embodiment of this application, still include first backup pad, fixed plate, be equipped with first slide rail in the first backup pad, be equipped with a plurality of first screws on the fixed plate, first adjusting nut of threaded connection on the first screw, the cover is equipped with first connecting plate and first spring on the first screw, first connecting plate sets up on first adjusting nut, first spring one end links to each other with first connecting plate, the other end links to each other with first backup pad, first spring is used for making the last mouth of a river and the lower mouth of a river of adjusting closely laminating well.
As another embodiment of this application, immersion nozzle is connected with the second backup pad, and the second backup pad is located first backup pad and fixed plate within a definite time, is equipped with the second screw rod in the second backup pad, and second screw rod threaded connection second adjusting nut, the cover is equipped with second connecting plate and second spring on the second screw rod, and the second connecting plate is set up on second adjusting nut, and second spring one end links to each other with the second connecting plate, and the other end links to each other with the second backup pad, and the second spring is used for making aligned immersion nozzle closely laminate with lower mouth of a river.
As another embodiment of the application, the outer wall and the inner wall of the opposite positive end of the submerged nozzle and the lower nozzle are respectively provided with a first inclined surface and a second inclined surface.
As another embodiment of the application, the driving mechanism comprises a hydraulic cylinder, a second slide rail and a slide block, wherein the hydraulic cylinder is fixedly arranged; the second sliding rail is arranged on one of the water outlets, and the length direction of the second sliding rail is parallel to the telescopic direction of the first spring; the slide block is arranged on the second slide rail in a sliding manner and is connected with the cylinder rod of the hydraulic cylinder.
As another embodiment of this application, the lower part of the mouth of a river is equipped with the mount pad, be equipped with first slide and the second slide that is parallel to each other in the mount pad, it is provided with first slide bar to slide in the first slide, be equipped with the second slide bar in the second slide, be equipped with the lever on the mount pad, the lever middle part is rotated with the mount pad and is connected, the both ends of lever respectively with first slide bar and the contact of second slide bar, the lever end is kept away from to the second slide bar is equipped with the third spring, all be equipped with the apron on first slide bar and the first slide bar, the mouth of a river is closed or opened down through relative or back-to-back movement to two apron, first slide bar passes through ejection mechanism.
As another embodiment of the application, a socket is arranged on the mounting seat, the first sliding rod is opposite to the socket, the ejection mechanism comprises a socket, an inserting rod and a fourth spring, the socket is arranged on the first sliding rail, and a third slideway is arranged in the socket; the inserted rod is arranged in the third slide way in a sliding manner, one end of the inserted rod can extend into a socket of the lower water gap opposite to the upper water gap, and two sides of the inserted end of the inserted rod are provided with guide inclined planes; and the fourth spring is arranged in the third slide way, one end of the fourth spring is connected with the inserted bar, and the other end of the fourth spring is connected with the socket and used for pushing the inserted bar to insert into the socket.
The method for casting the fixed diameter nozzle comprises the following steps:
a, after the middle ladle is knotted, a lower water gap with a smaller aperture is opposite to an upper water gap on the middle ladle;
b, baking the tundish, pouring when the molten steel in the tundish reaches a preset temperature, and starting a vibration device of the crystallizer and starting to give a pulling speed after the molten steel is injected into the crystallizer for a period of time;
and C, after the pulling speed of the continuous casting machine is stable and the head blank is discharged out of the crystallizer, replacing the lower water gap with a smaller aperture with the lower water gap with a larger aperture and improving the pulling speed.
As another embodiment of the application, after the lower nozzle with larger aperture is replaced, the pulling speed is controlled to be 2.5m/min-3 m/min.
As another embodiment of the present application, the predetermined temperature is 1530-1545 ℃.
The invention provides a fixed diameter nozzle replacement pouring device and a fixed diameter nozzle opening pouring method, which have the beneficial effects that: compared with the prior art, the fixed diameter nozzle replacement pouring device has the advantages that the upper nozzle is connected with the tundish; the aperture of each of the two lower water gaps is one big and one small, the two lower water gaps can slide along the first slide rail under the action of the driving mechanism, one of the lower water gaps is selected by the driving mechanism to be communicated with the upper water gap, the submersed nozzle is positioned below the lower water gap, the upper end of the submersed nozzle is in close contact with and communicated with the lower water gap communicated with the lower end of the upper water gap, and the lower part of the submersed nozzle extends into the crystallizer. When casting, the lower nozzle with smaller aperture is positioned between the upper nozzle and the submerged nozzle, the upper end of the lower nozzle is in close contact with and communicated with the upper nozzle, the lower end of the lower nozzle is in close contact with and communicated with the submerged nozzle, and the molten steel flows into the crystallizer from the tundish through the lower nozzle with smaller aperture and the submerged nozzle. Treat that conticaster pulling speed is stable and the head base goes out the crystallizer after, actuating mechanism promotes two lower mouths of a river and slides along first slide rail, make the great lower mouth of a river in aperture be located between water feeding mouth and immersion nozzle, realize the online replacement of two water feeding mouths, make the molten steel flow out from the package and flow into immersion nozzle through the great lower mouth of a river in aperture, can be by little grow at the in-process of opening and watering because of the aperture of lower mouth of a river, thereby can be stable and the head base goes out the crystallizer at conticaster pulling speed after, under the safe prerequisite, improve higher pulling speed, and the production efficiency is improved. The fixed diameter nozzle casting method provided by the invention is characterized in that a lower nozzle with a smaller aperture is communicated with an upper nozzle and an immersion nozzle, after the casting speed of a continuous casting machine is stable and a head billet is discharged out of a crystallizer, the lower nozzle with the smaller aperture is changed into a lower nozzle with a larger aperture on line, so that the lower nozzle with a small aperture is adopted for slow casting in the initial casting stage, the control of casting speed is convenient, the lower nozzle with a large aperture is changed after the casting speed is stable and the head billet is discharged out of the crystallizer, the casting speed can be increased, and the production efficiency can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a fixed diameter nozzle replacement pouring device provided by an embodiment of the invention;
FIG. 2 is a schematic structural view of a fixed diameter nozzle replacement casting device according to another aspect of the present invention;
FIG. 3 is a front view of a metering nozzle replacement casting apparatus according to an embodiment of the present invention;
FIG. 4 is a sectional view taken along line A-A of FIG. 3;
FIG. 5 is a schematic view of a metering nozzle arrangement for use with an embodiment of the invention;
FIG. 6 is a bottom view of FIG. 5;
FIG. 7 is a schematic view of the contact between the lower nozzle and the submerged entry nozzle in this embodiment;
fig. 8 is a sectional structural view taken along line B-B in fig. 7.
In the figure: 1. a middle package; 2. a water feeding port; 3. a water outlet; 4. a first support plate; 5. a fixing plate; 6. a crystallizer; 7. a first adjusting nut; 8. a first connecting plate; 9. a first screw; 10. a first spring; 11. a socket; 12. a first slide rail; 13. a hydraulic cylinder; 14. a mounting seat; 15. a second slide rail; 16. a slider; 18. an immersion nozzle; 19. a second support plate; 20. a second screw; 21. a second spring; 22. a second adjusting nut; 23. a second connecting plate; 24. a first slide bar; 25. inserting a rod; 26. a fourth spring; 27. a second slide bar; 28. pushing the top ball; 29. a lever; 30. a third spring; 31. a socket; 32. a cover plate; 1801. a first inclined plane; 1802. a second inclined plane.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and 2 together, the metering nozzle replacement casting device of the present invention will now be described. The fixed diameter nozzle replacement pouring device comprises an upper nozzle 2, an immersion nozzle 18, a first slide rail 12, a lower nozzle 3 and a driving mechanism, wherein the upper nozzle 2 is used for being connected with a tundish 1; the two lower water gaps 3 have different apertures and are both connected with the first slide rail 12 in a sliding way, and the upper end of each lower water gap 3 is closely contacted and communicated with the lower end of the upper water gap 3 when sliding under the upper water gap 2; the submerged nozzle 18 is positioned below the lower nozzle 3, the upper end of the submerged nozzle is tightly contacted and communicated with the lower nozzle 3 communicated with the lower end of the upper nozzle 2, and the lower part of the submerged nozzle is used for extending into the crystallizer 6; the driving mechanism is respectively connected with the two lower water gaps 3 and used for pushing the lower water gaps 3 to move along the first slide rail 12 so as to select one of the lower water gaps 3 to be communicated with the upper water gap 2 and the submerged nozzle 18.
Compared with the prior art, the fixed diameter nozzle replacement pouring device provided by the invention has the advantages that the upper nozzle 2 is connected with the tundish 1; the aperture of each of the two lower nozzles 3 is one big and one small, the two lower nozzles 3 can slide along the first slide rail 12 under the action of the driving mechanism, one of the lower nozzles 3 is selected by the driving mechanism to be communicated with the upper nozzle 2, the submerged nozzle 18 is positioned below the lower nozzle 3, the upper end of the submerged nozzle is closely contacted and communicated with the lower nozzle 3 communicated with the lower end of the upper nozzle 2, and the lower part of the submerged nozzle 18 extends into the crystallizer 6. When casting, the lower nozzle 3 with smaller aperture is positioned between the upper nozzle 2 and the submerged nozzle 18, the upper end is closely contacted and communicated with the upper nozzle 2, the lower end is closely contacted and communicated with the submerged nozzle 18, and the molten steel flows into the crystallizer 6 from the middle ladle 1 through the lower nozzle 3 with smaller aperture and the submerged nozzle 18. After the casting speed of the continuous casting machine is stable and the head blank is discharged out of the crystallizer 6, the driving mechanism pushes the two lower water gaps 3 to slide along the first slide rail 12, so that the lower water gap 3 with larger aperture is positioned between the upper water gap 2 and the submerged water gap 18, the online replacement of the two upper water gaps 2 is realized, the molten steel flows into the submerged water gap 18 through the lower water gap 3 with larger aperture after flowing out of the tundish 1, the aperture of the lower water gap 2 can be changed from small to large in the casting process, and therefore the higher casting speed is improved on the premise of safety after the casting machine is stable in casting speed and the head blank is discharged out of the crystallizer 6, and the production efficiency is improved.
As a specific embodiment of the fixed diameter nozzle replacement pouring device provided by the present invention, please refer to fig. 3, which further includes a first support plate 4 and a fixed plate 5, wherein the first support plate 4 is provided with a first slide rail 12, the fixed plate 5 is provided with a plurality of first screws 9, the first screws 9 are in threaded connection with first adjusting nuts 7, the first screws 9 are sleeved with a first connection plate 8 and a first spring 10, the first connection plate 8 is erected on the first adjusting nuts 7, one end of the first spring 10 is connected with the first connection plate 8, the other end is connected with the first support plate 4, and the first spring 10 is used for tightly fitting the aligned upper nozzle 2 and the lower nozzle 3.
In this embodiment, the first adjusting nut 7 is rotated to ascend or descend along the first screw 9, so as to drive the first connecting plate 8 to ascend or descend, and adjust the compression amount of the first spring 10, so as to push the lower nozzle 3 to be close to the upper nozzle 2, thereby ensuring the sealing property.
Referring to fig. 3, as a specific implementation manner of the embodiment of the present invention, the submerged nozzle 18 is connected to a second supporting plate 19, the second supporting plate 19 is located between the first supporting plate 4 and the fixing plate 5, a second screw 20 is disposed on the second supporting plate 19, the second screw 20 is in threaded connection with a second adjusting nut 22, a second connecting plate 23 and a second spring 21 are sleeved on the second screw 20, the second connecting plate 23 is erected on the second adjusting nut 22, one end of the second spring 21 is connected to the second connecting plate 23, the other end is connected to the second supporting plate 19, and the second spring 21 is used for tightly attaching the submerged nozzle 18 and the lower nozzle 3 which are aligned.
In this embodiment, the second adjusting nut 22 is rotated to ascend or descend along the second screw 20, so as to drive the second connecting plate 23 to ascend or descend, thereby adjusting the pressing amount of the second spring 21, and further pushing the submerged nozzle 18 to be close to the lower nozzle 3, thereby ensuring the sealing performance. In this embodiment, the two water discharge ports 3 are close to each other, and when the drive mechanism estimates that one of the water discharge ports 3 is separated from the space between the water supply port 2 and the submerged entry nozzle 18, the other water discharge port 3 is immediately entered. One of the lower nozzles 3 is moved out a point between the upper nozzle 2 and the submerged nozzle 18, and the other lower nozzle 3 is moved into a point between the upper nozzle 2 and the submerged nozzle 18.
Referring to fig. 7 and 8, as a specific implementation manner of the embodiment of the present invention, the outer wall and the inner wall of the opposite ends of the submerged nozzle 18 and the lower nozzle 3 are respectively provided with a first inclined surface 1801 and a second inclined surface 1802.
In this embodiment, the inner wall and the outer wall of the submerged nozzle 3 are respectively provided with the second inclined plane 1802 and the first inclined plane 1801, so that the submerged nozzle 18 can be conveniently squeezed into or out of the submerged nozzle 3 during replacement.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 to 2, the driving mechanism includes a hydraulic cylinder 13, a second slide rail 15, and a slider 16, wherein the hydraulic cylinder 13 is fixedly disposed; the second slide rail 15 is arranged on one of the lower water gaps 3, and the length direction of the second slide rail 15 is parallel to the telescopic direction of the first spring 10; the slide block 16 is slidably arranged on the second slide rail 15, and the slide block 16 is connected with the cylinder rod of the hydraulic cylinder 13.
In this embodiment, if the hydraulic cylinder 13 is placed on the first support plate 4, the first support plate 4 bears a heavy load, which is not favorable for the long-term use of the first spring 10. The hydraulic cylinder 13 is fixed outside the first supporting plate 4, the second sliding rail 15 is arranged on one of the water discharging openings 3, the sliding block 16 slides on the second sliding rail 15, the hydraulic cylinder 13 is connected with the sliding block 16, and when the water discharging opening 3 is vertically and finely adjusted under the action of the first spring 10, the pushing of the hydraulic cylinder 13 is not influenced.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 3 to 6, a mounting seat 14 is disposed at a lower portion of the drain 3, a first slide and a second slide which are parallel to each other are disposed in the mounting seat 14, a first slide 24 is slidably disposed in the first slide, a second slide 27 is disposed in the second slide, a lever 29 is disposed on the mounting seat 14, a middle portion of the lever 29 is rotatably connected to the mounting seat 14, two ends of the lever 29 are respectively in contact with the first slide 24 and the second slide 27, an end of the second slide 27 away from the lever 29 is provided with a third spring 30, the first slide 24 and the first slide 24 are both provided with cover plates 32, the two cover plates 32 close or open the drain 3 by moving relatively or reversely, and the first slide 24 is pushed and moved by a pushing mechanism to open or close the cover plates 32.
In this embodiment, two ends of the lever 29 are respectively hinged with the pushing balls 28, and the cylinder rod is respectively contacted with the first slide bar 24 and the second slide bar 27 through the two pushing balls 28.
In this embodiment, when the pushing mechanism pushes the first slide bar 24 to slide towards the lever 29, the first slide bar 24 pushes the lever 29 to rotate, so that the lever 29 pushes the second slide bar 27 to slide towards the opposite direction of the first slide bar 24, thereby moving the two cover plates 32 back to back and opening the drain 3. When the pushing mechanism is no longer pushed, the second slide rod 27 is reset under the action of the third spring 30, the pushing lever 29 is rotated reversely, so that the first slide rod 24 is pushed to reset, the two cover plates 32 move towards each other, and the drain 3 is closed. In this embodiment, under the action of the pushing mechanism, when the lower nozzle 3 is aligned with the upper nozzle 2 and the submerged nozzle 18, the cover plate 32 of the lower nozzle 3 is closed, and when the lower nozzle 3 is separated from the space between the upper nozzle 2 and the submerged nozzle 18, the cover plate 32 is instantly closed, so as to prevent part of the molten steel from being thrown out when the two lower nozzles 3 are switched.
In this embodiment, when the drain 3 is moved out, the two cover plates 32 move inward synchronously to close, the first inclined surface 1801 is disposed on the outer wall of the submerged drain 3, which does not obstruct the closing of the two cover plates 32, and the cover plate 32 can be squeezed into the space between the drain 3 and the submerged drain 18 through the first inclined surface 1801. While also facilitating the squeezing in of another collector nozzle 3 with a closed cover plate 32. When the cover plate 32 is opened, the submerged nozzle 18 is automatically attached to the lower nozzle 3 by the second spring 21.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 3 to 6, a socket 31 is disposed on the mounting seat 14, the first sliding rod 24 is opposite to the socket 31, the pushing mechanism includes a socket 11, a plug rod 25, and a fourth spring 26, the socket 11 is disposed on the first sliding rail 12, and a third sliding way is disposed in the socket 11; the inserted rod 25 is arranged in the third slide way in a sliding way, one end of the inserted rod can extend into the socket 31 of the lower nozzle 3 which is opposite to the upper nozzle 2, and two sides of the inserted end of the inserted rod 25 are provided with guide inclined planes; the fourth spring 26 is disposed in the third slide way, and has one end connected to the insertion rod 25 and the other end connected to the socket 11 for pushing the insertion rod 25 to be inserted into the insertion opening 31.
In this embodiment, when the lower nozzle 3 enters between the upper nozzle 2 and the submerged nozzle 18, the spigot 31 is aligned with the plunger 25, and the plunger 25 enters the first slide way from the spigot 31 under the elastic force of the fourth spring 26 to push the first slide bar 24 to move towards the lever 29, so that the cover plate 32 is opened. Because the two sides of the inserted link 25 are both provided with the guiding inclined planes, when the hydraulic cylinder 13 pushes the sewage outlet 3 to move, the mounting seat 14 moves to contact with the guiding inclined planes, the inserted link 25 is pushed to withdraw the socket 11, the second slide bar 27 is reset under the action of the third spring 30, the first slide bar 24 is driven to reset, the cover plate 32 is closed, and therefore when the two sewage outlets 3 are replaced, the automatic opening and closing of the cover plate 32 are realized.
In this embodiment, the two mounting seats 14 are connected by a blocking plate for blocking the insertion rod 25 from being inserted between the two mounting seats 14, so that the insertion rod 25 can only be inserted into the insertion opening 31.
The invention also provides a fixed diameter nozzle opening casting method. The method comprises the following steps:
a, after the middle ladle 1 is knotted, a lower water gap 3 with a smaller aperture is opposite to an upper water gap 2 on the middle ladle 1;
b, baking the tundish 1, pouring after the molten steel in the tundish 1 reaches a preset temperature, and starting a vibration device of the crystallizer 6 and starting to give a pulling speed after the molten steel is injected into the crystallizer 6 for a period of time;
and C, after the pulling speed of the continuous casting machine is stable and the head blank is discharged out of the crystallizer 6, replacing the lower water gap 3 with a smaller aperture with the lower water gap 3 with a larger aperture and improving the pulling speed.
The fixed diameter nozzle casting method provided by the invention is characterized in that the lower nozzle 3 with smaller aperture diameter is communicated with the upper nozzle 2 and the submerged nozzle 18, after the casting speed of the continuous casting machine is stable and the head blank is discharged from the crystallizer 6, the lower nozzle 3 with smaller aperture diameter is changed into the lower nozzle 3 with larger aperture diameter on line, so that the lower nozzle 3 with small aperture diameter is adopted for slow casting in the initial casting stage, the control of the casting speed is convenient, the lower nozzle 3 with large aperture diameter is changed after the casting speed is stable and the head blank is discharged from the crystallizer 6, the casting speed can be increased, and the production efficiency can be improved.
As a specific implementation manner of the embodiment of the invention, after the lower water gap 3 with larger aperture is replaced, the pulling speed is controlled to be 2.5m/min-3 m/min.
As a specific implementation manner of the embodiment of the present invention, the preset temperature is 1530-1545 ℃.
In this embodiment, a billet having a cross section of 165mm × 165mm is cast, the length of the crystallizer 6 is 900mm, and the fixed diameter nozzle opening method includes the following steps:
a, after the middle ladle 1 is knotted, a lower water gap 3 with the aperture of 16.5mm is opposite to an upper water gap 2 on the middle ladle 1;
b, the dummy bar is sent into a crystallizer 6 of a continuous casting machine, the sending depth is 80mm, a proper dry cold charge is added, the middle ladle is baked for 5 hours, the pouring is started after the temperature of molten steel in the middle ladle 1 reaches 1530-1545 ℃, the molten steel is injected into the crystallizer 6 and the vibration device of the crystallizer 6 is started and the pulling speed is started after 10 seconds;
and C, after the pulling speed of the continuous casting machine is stable and the head blank is discharged out of the crystallizer 6, replacing the lower water gap 3 with the aperture of 16.5mm with the lower water gap 3 with the aperture of 20mm and improving the pulling speed.
In this embodiment, the dummy bar is one of important apparatuses for continuous steel casting and iron making. The dummy bar consists of a dummy head, a transition piece and a bar body. Before pouring, the dummy bar head and part of transition piece enter the crystallizer 6 to form a movable 'inner bottom' of the crystallizer 6, after pouring, molten steel is solidified and is condensed with the dummy bar head, a withdrawal and straightening machine draws a dummy bar, and a casting blank is continuously drawn out of the crystallizer 6 until the dummy bar head passes through the rear part of the withdrawal and straightening machine to be separated from the casting blank and enters a dummy bar storage device.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Pouring device is changed at sizing mouth of a river, its characterized in that includes:
the water feeding port is used for being connected with the tundish;
a first slide rail;
the two lower water gaps have different apertures and are both connected with the first slide rail in a sliding manner, and the upper end of each lower water gap is closely contacted and communicated with the lower end of the upper water gap when sliding to the position below the upper water gap;
the submerged nozzle is positioned below the lower nozzle, the upper end of the submerged nozzle is tightly contacted and communicated with the lower nozzle communicated with the lower end of the upper nozzle, and the lower part of the submerged nozzle is used for extending into the crystallizer; and
and the driving mechanism is respectively connected with the two water outlets and is used for pushing the water outlets to move along the first slide rail so as to select one of the water outlets to be communicated with the upper water outlet and the submerged water outlet.
2. A fixed diameter nozzle replacement pouring device according to claim 1, further comprising a first support plate and a fixed plate, wherein the first slide rail is arranged on the first support plate, a plurality of first screws are arranged on the fixed plate, a first adjusting nut is connected to the first screws in a threaded manner, a first connecting plate and a first spring are sleeved on the first screws, the first connecting plate is arranged on the first adjusting nut in an overlapping manner, one end of the first spring is connected with the first connecting plate, the other end of the first spring is connected with the first support plate, and the first spring is used for enabling the aligned upper nozzle and the aligned lower nozzle to be tightly attached to each other.
3. A fixed diameter nozzle replacement pouring device according to claim 2, wherein a second support plate is connected to the submerged nozzle, the second support plate is located between the first support plate and the fixed plate, a second screw is arranged on the second support plate, the second screw is in threaded connection with a second adjusting nut, a second connecting plate and a second spring are sleeved on the second screw, the second connecting plate is overlapped on the second adjusting nut, one end of the second spring is connected with the second connecting plate, the other end of the second spring is connected with the second support plate, and the second spring is used for enabling the aligned submerged nozzle and the lower nozzle to be tightly attached.
4. A fixed diameter nozzle replacement pouring device as claimed in claim 3, wherein said submerged entry nozzle and said collector nozzle are provided with first and second inclined surfaces on the outer and inner walls of the opposite ends, respectively.
5. A metering nozzle replacement pouring device according to claim 2, wherein said drive mechanism comprises:
the hydraulic cylinder is fixedly arranged;
the second sliding rail is arranged on one of the water outlets, and the length direction of the second sliding rail is parallel to the telescopic direction of the first spring;
and the sliding block is arranged on the second sliding rail in a sliding manner and is connected with the cylinder rod of the hydraulic cylinder.
6. A fixed diameter nozzle replacement pouring device according to claim 4, wherein a mounting seat is arranged at the lower part of the lower nozzle, a first slide way and a second slide way which are parallel to each other are arranged in the mounting seat, a first slide rod is arranged in the first slide way in a sliding manner, a second slide rod is arranged in the second slide way, a lever is arranged on the mounting seat, the middle part of the lever is rotatably connected with the mounting seat, two ends of the lever are respectively contacted with the first slide rod and the second slide rod, a third spring is arranged at the end, far away from the lever, of the second slide rod, cover plates are arranged on the first slide rod and the first slide rod, the two cover plates close or open the lower nozzle through relative or reverse movement, and the first slide rod is pushed and moved through a pushing mechanism to realize the opening and closing of the cover plates.
7. A metering nozzle replacement pouring device according to claim 6, wherein said mounting block is provided with a socket, said first slide bar being opposite said socket, said ejector mechanism comprising:
the socket is arranged on the first sliding rail, and a third sliding way is arranged in the socket;
the inserted rod is arranged in the third slide way in a sliding manner, one end of the inserted rod can extend into a socket of the lower water gap opposite to the upper water gap, and two sides of the inserted end of the inserted rod are provided with guide inclined planes;
and the fourth spring is arranged in the third slide way, one end of the fourth spring is connected with the inserted bar, and the other end of the fourth spring is connected with the socket and used for pushing the inserted bar to be inserted into the socket.
8. The fixed diameter nozzle opening method is characterized by comprising the following steps:
A. after the tundish is knotted, the lower water gap with smaller aperture is opposite to the upper water gap on the tundish;
B. baking the tundish, pouring when the molten steel in the tundish reaches a preset temperature, and starting a vibration device of the crystallizer and starting to give a pulling speed after the molten steel is injected into the crystallizer for a period of time;
C. and after the casting speed of the continuous casting machine is stable and the head blank is discharged out of the crystallizer, replacing the lower water gap with the smaller aperture with the lower water gap with the larger aperture and improving the casting speed.
9. A method for opening a metering nozzle according to claim 8, wherein said casting speed is controlled to 2.5m/min to 3m/min after the replacement of the collector nozzle having a larger bore diameter.
10. The metering nozzle opening method according to claim 8, wherein the preset temperature is 1530-1545 ℃.
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| CN202011164644.6A CN112427611B (en) | 2020-10-27 | 2020-10-27 | Fixed diameter nozzle replacement pouring device and fixed diameter nozzle pouring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011164644.6A CN112427611B (en) | 2020-10-27 | 2020-10-27 | Fixed diameter nozzle replacement pouring device and fixed diameter nozzle pouring method |
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| CN112427611B CN112427611B (en) | 2022-04-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115351270A (en) * | 2022-06-28 | 2022-11-18 | 东北大学 | Fixing device of middle package bottom electromagnetism whirl water gap equipment |
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|---|---|
| CN112427611B (en) | 2022-04-26 |
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