CN108620546B - Plug-in device for preventing continuous casting billet tail billet from rising and using method thereof - Google Patents
Plug-in device for preventing continuous casting billet tail billet from rising and using method thereof Download PDFInfo
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- CN108620546B CN108620546B CN201710186456.5A CN201710186456A CN108620546B CN 108620546 B CN108620546 B CN 108620546B CN 201710186456 A CN201710186456 A CN 201710186456A CN 108620546 B CN108620546 B CN 108620546B
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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
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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
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
- B22D27/11—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of mechanical pressing devices
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Abstract
The invention discloses a plug-in device for preventing a continuous casting billet tail billet from rising and a use method thereof, wherein the plug-in device consists of two plug-ins and four undercarriage connecting rod mechanisms; the two plug-ins comprise a left plug-in and a right plug-in and are respectively arranged on the lifting support frame of the tundish trolley through two undercarriage connecting rod mechanisms; the left side plug-in components and the right side plug-in components have the same structure and are collectively called plug-in components, and the top of each plug-in component is welded and fixed with two mounting rings; the four undercarriage connecting rod mechanisms have the same structure and are respectively connected with the four mounting rings on the two plug-in units in a one-to-one correspondence manner; each undercarriage connecting rod mechanism consists of a plug-in connecting rod, a thrust oil cylinder, a fixed frame and an oil cylinder connecting rod which are connected with each other by a hinge structure; the fixed frame is fixed on the support frame of the lifting trolley of the tundish by bolts. The invention has high reliability of preventing the rising; the automation degree of the operation is high; can effectively protect continuous casting machine equipment.
Description
Technical Field
The invention relates to the field of continuous casting, in particular to a plug-in device for preventing a continuous casting billet from rising and a use method thereof, which can prevent the occurrence of drawing and rising accidents in the casting of a wide and thick plate continuous casting machine.
Background
The steel requirements specific to wide and thick plates necessarily require that a slight reduction means (as shown in figure 1) is adopted in continuous casting production, the slight reduction means is a means for improving the occurrence of central looseness and central segregation when a continuous casting slab is solidified, a proper reduction amount is added to the slab 11 at the solidification end 12 of the slab, and the roll gap of a sector section at the solidification end is reduced (namely, the distance between a roller and a roller on the sector section, namely the roll gap value is properly reduced), the internal quality defects of the continuous casting slab, and the like, can be overcome by the slight reduction means, the use of the slight reduction means enables the molten steel quantity extruded by the slight reduction after final casting to be larger than the molten steel shrinkage quantity in the solidification process, so that drawing and bulging accidents frequently occur in continuous casting of the wide and thick plates, once the bulging accidents occur, the continuous casting mold and the sector section of No. 0 or the sector section No. 1, and sometimes the molten steel shrinkage accidents due to improper operation can also cause the blank stagnation accidents, all the accidents not only cause large loss on equipment, but also bring great influence on the production logistics and steelmaking capacity, the current molten steel solidification of the molten steel surface, and the molten steel surface shrinkage of the molten steel is more easily balanced with the molten steel, and the molten steel is more easily caused by the short molten steel shrinkage of the molten steel in the top of the molten steel pouring process, so that the molten steel is smaller than the molten steel shrinkage of the molten steel pouring of a molten steel pouring process is more easily caused by the abnormal top of a molten steel pouring process, the top of a molten steel pouring short molten steel pouring process, the top of a molten steel pouring process is more easily caused by the small top of a submerged slag-up pouring.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an insert device for preventing a continuous casting billet tail blank from rising and a using method thereof.
The purpose of the invention is realized by the following technical scheme:
a plug-in device for preventing a continuous casting billet tail billet from rising consists of two plug-ins and four undercarriage connecting rod mechanisms;
the two plug-ins comprise a left plug-in and a right plug-in, the left plug-in and the right plug-in are respectively installed on a lifting support frame of the tundish trolley through two undercarriage connecting rod mechanisms respectively and are respectively arranged on two sides of a submerged nozzle of the tundish, and the trolley lifting support frame is positioned at the bottom of the tundish;
the left plug-in and the right plug-in are identical in structure and are collectively called as plug-ins, and two mounting rings are welded and fixed at the top of each plug-in;
the four undercarriage connecting rod mechanisms have the same structure and are respectively connected with the four mounting rings on the two plug-in units in a one-to-one correspondence manner;
every undercarriage connecting rod mechanism comprises plug-in components connecting rod, thrust cylinder, fixed frame and hydro-cylinder connecting rod, wherein: the lower end of the plug-in connecting rod is hinged with a mounting ring on the plug-in through a second shaft pin; the upper end of the plug-in connecting rod is hinged with the fixed frame through a first shaft pin; the middle part of the plug-in connecting rod is hinged with one end of the middle supporting rod through a third shaft pin; the other end of the middle support rod is hinged with one end of the thrust rod and the thrust oil cylinder through a fourth shaft pin; the other end of the thrust rod is hinged with the fixed frame through a fifth shaft pin; the end part of the thrust oil cylinder is connected and installed on the fixed frame by a hinge; the fixed frame is fixed on the support frame of the tundish lifting trolley by bolts.
The interior of the plug-in is a rectangular keel frame formed by welding structural steel; the keel frame is formed by pouring an aluminum-carbon refractory material into a rectangular plug-in unit in a die casting mode, and the bottom of the plug-in unit is provided with a triangular guide structure.
The keel frame is composed of two I-shaped steels and two rectangular steels, the two I-shaped steels are arranged in a vertical parallel mode, the two rectangular steels are supported and welded and fixed on the left side and the right side between the two I-shaped steels, the top of one I-shaped steel on the upper portion is a plug-in piece top, the left direction and the right direction of the plug-in piece top are welded and fixed through the two mounting rings, and the two mounting rings are parallel to each other.
The length of the plug-in unit is 800mm, the height of the plug-in unit is 600mm, the thickness of the plug-in unit is 200mm, and the bottom angle α of the guide structure is 120 degrees.
The undercarriage connecting rod mechanism is characterized in that the action process of the undercarriage connecting rod mechanism is that the plug-in is stretched and contracted from a standby position to a vertical insertion position, the operation process of the thrust oil cylinders is that the pushing-out and withdrawing actions are realized through hydraulic electromagnetic directional valves, and a speed regulating valve is arranged in each hydraulic loop of each thrust oil cylinder, so that the speed and the position of the four thrust oil cylinders are kept synchronous in the pushing-out process.
The other purpose of the invention is realized by the following technical scheme:
the use method of the plug-in device for preventing the rising of the continuous casting billet tail billet adopts the plug-in device for preventing the rising of the continuous casting billet tail billet, and comprises the following steps:
when the plug-in device is normal, the thrust oil cylinder in the undercarriage connecting rod mechanism is in standby and is in a retraction state, and the plug-in is not inserted into the crystallizer;
when an abnormal condition occurs, lifting a supporting frame of a lifting trolley of a tundish, pulling a molten steel surface in a crystallizer to a position 300mm away from the upper end of the crystallizer, starting a thrust oil cylinder in a landing gear connecting rod mechanism, extending the thrust oil cylinder to enable a plug-in connecting rod, the thrust oil cylinder, a fixed frame and an oil cylinder connecting rod to move through respective hinge structures, enabling two plug-ins to be perpendicular to the tundish and to be flush with an immersion nozzle, aligning the plug-ins to the central position of the crystallizer, enabling the supporting frame of the lifting trolley of the tundish to descend, enabling the plug-ins to be inserted into the crystallizer with the depth of 300mm, enabling the molten steel surface to ascend with the crystallizer, enabling the ascending liquid molten steel to be in contact with a copper plate of the crystallizer, forming a new blank shell of a continuous casting slab with the thickness of 5mm on the surface of the copper plate due to a cooling effect given by the crystallizer, lifting the, the newly extended blank shell enables the tail of the plate blank to leave a space for containing the extruded molten steel; and after the tundish is lifted again, retracting the thrust oil cylinder to enable the plug-in unit to return to the standby position, and cleaning cold steel on the surface of the plug-in unit in time when the tundish lifting trolley supporting frame is off-line.
The invention has the beneficial effects that:
the plug-in device for preventing the rising of the tail billet of the continuous casting billet ensures that the liquid level of the molten steel rises through squeezing the molten steel in the crystallizer to promote the generation of a shell of the elongated tail billet in the crystallizer, thereby increasing the space for containing the molten steel in the tail billet and preventing the rising in an indirect mode. The invention is especially suitable for being used on a continuous casting machine for continuously casting thick plates with the thickness of more than 300mm, and the generated benefits are very considerable.
Compared with the prior art, the method of the invention has the following characteristics: the reliability of preventing the bursting is high; the automation degree of the operation is high; can effectively protect continuous casting machine equipment.
To further illustrate the above objects, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of a light press method used in the continuous casting production of wide and thick plates;
FIG. 2 is a schematic structural diagram of a plug-in unit for preventing the rising of a continuous casting billet tail billet according to the invention;
figure 3 is a schematic view of the keel frame construction of the insert of figure 2;
FIG. 4 is a schematic view of the external structure of the insert of FIG. 2;
FIG. 5 is a schematic view of the landing gear link mechanism of FIG. 2 (with the thrust cylinder extended vertically and the insert inserted into the mold);
FIG. 6 is a schematic view of the landing gear link mechanism of FIG. 2 (thrust cylinder standby in retracted state, insert not inserted into mold);
fig. 7 is a using state diagram of the plug-in device for preventing the rising of the continuous casting billet tail billet.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to the drawings of the embodiment.
The plug-in unit for preventing the rising of the tail billet of the continuous casting billet is shown in figure 2 and consists of two plug-in units and four undercarriage connecting rod mechanisms.
The two plug-ins comprise a left plug-in 22 and a right plug-in 23, the left plug-in 22 and the right plug-in 23 are respectively installed on a tundish trolley lifting support frame 21 through two respective undercarriage connecting rod mechanisms 24 and are respectively arranged on two sides of a tundish submerged nozzle 25, and the trolley lifting support frame 21 is positioned at the bottom of a tundish.
The left insert 22 and the right insert 23 have the same structure and are collectively referred to as an insert 30, as shown in fig. 3, the insert 30 is internally provided with a rectangular keel frame formed by welding structural steel, the keel frame is composed of two i-beams 31 and two rectangular steels 32, the two i-beams 31 are arranged in parallel up and down, the two rectangular steels 32 are supported and welded and fixed on the left and right sides between the two i-beams 31, the top of the upper i-beam is the top of the insert, the left and right directions of the top of the insert are welded and fixed with two mounting rings 33, the two mounting rings 33 are mutually parallel, as shown in fig. 4, the keel frame is formed by casting an aluminum carbon refractory material into the insert 30 in a die casting mode, the insert 30 is rectangular, the bottom of the insert 30 is provided with a triangular guide structure 34, the length of the insert 30 is 800mm, the height of the insert is 600mm, the thickness of the insert 30 is 200mm, the bottom angle α degrees of the guide structure 34 is 120 degrees, and the guide structure 34 is arranged to be capable of discharging slag above the surface to the periphery, so as to prevent.
The four landing gear connecting rod mechanisms have the same structure and are respectively connected with the four mounting rings on the two plug-in units 30 in a one-to-one correspondence manner.
Each landing gear connecting rod mechanism 24 is composed of a plug-in connecting rod 41, a thrust cylinder 42, a fixed frame 43, and a cylinder connecting rod 44. Wherein:
the lower end of the inserter connecting rod 41 is hinged with a mounting ring 33 on the inserter through a second shaft pin 412; the upper end of the card connecting rod 41 is hinged with the fixed frame 43 through a first shaft pin 411; the middle part of the plug-in connecting rod 41 is hinged with one end of the middle supporting rod 45 through a third shaft pin 441; the other end of the middle support rod 45 is hinged with one end of the thrust rod 44 and the thrust cylinder 42 through a fourth shaft pin 442; the other end of the thrust rod 44 is hinged with the fixed frame 43 through a fifth shaft pin 443; the end of the thrust cylinder 42 is mounted on the fixed frame 43 by a hinge connection. The fixed frame 43 is fixed on the tundish lifting trolley support frame 21 by bolts, so that the fixed frame 43 and the tundish lifting trolley support frame 21 are lifted synchronously.
In the action process of each landing gear connecting rod mechanism 24, the thrust oil cylinders 42 stretch and retract to realize the movement of the plug-in from a standby position to a vertical insertion position, in the operation process of the thrust oil cylinders 42, the pushing-out and withdrawing actions are realized through hydraulic electromagnetic directional valves (not shown), and speed regulating valves (not shown) are respectively added to hydraulic circuits of each thrust oil cylinder in a hydraulic control oil circuit to ensure the synchronization and the coordination of the speed and the position in the pushing-out process of the four thrust oil cylinders.
The structure is formed by adopting a thrust oil cylinder 42 to push a movable chain connecting rod supporting mechanism, and the structure can properly solve the defects that the bottom space of the tundish is narrow, the plug-in components have heavier mass and manual insertion cannot be carried out manually.
The use method of the plug-in device for preventing the rising of the tail billet of the continuous casting billet comprises the following steps:
in use, as shown in figure 2, the left and right side inserts 22, 23 are mounted on the tundish lifting carriage support frame 21 at the bottom of the tundish via respective landing gear linkage mechanisms 24. In normal conditions, as shown in fig. 6, the thrust cylinder in the landing gear connecting rod mechanism is in standby and is in a retracted state, and the plug-in is not inserted into the crystallizer.
When an abnormal condition occurs (when the rising probability is very high after the guiding and pulling out), the supporting frame 21 of the lifting trolley of the tundish is lifted, then the liquid level of the steel in the crystallizer 26 is pulled to the position 300mm away from the upper end of the crystallizer 26, the thrust oil cylinder 42 in the landing gear connecting rod mechanism 24 is started, as shown in fig. 5, the thrust cylinder is extended so that the insert connecting rod 41, the thrust cylinder 42, the fixing frame 43 and the cylinder connecting rod 44 are moved by respective hinge structures, and the two inserts 30 are perpendicular to the tundish and flush with the submerged nozzle 25, the insert is then aligned with the central position of the crystalliser 26 and the tundish lifting trolley support frame 21 is lowered, inserting the insert into the crystalliser 26 with a depth of 300mm, due to the displacement effect, the molten steel in the mold 26 rises along with the molten steel level by L (as shown in fig. 7), this raised liquid level L can be suitably controlled by the stroke of lowering the tundish lift car support frame 21. But to ensure that the level of steel does not overflow the crystalliser. After the rising liquid molten steel is contacted with the crystallizer copper plate, a new blank shell of the continuous casting plate blank with the thickness reaching about 5mm is formed on the surface of the copper plate quickly due to the cooling effect given by the crystallizer copper plate, the insert is pulled out of the crystallizer by lifting the tundish after the insert is inserted into the crystallizer for 10 seconds, and the newly extended blank shell ensures that a large space is reserved at the tail part of the plate blank to contain the extruded molten steel. After the tundish is raised, the thrust cylinder 42 is retracted so that the card returns to the standby position. And timely cleaning cold steel on the surface of the plug-in when the tundish lifting trolley supporting frame 21 is off-line.
It should be understood by those skilled in the art that the above embodiments are for illustrative purposes only and are not intended to limit the present invention, and that changes and modifications to the above embodiments may fall within the scope of the appended claims.
Claims (6)
1. A plug-in unit device for preventing the rising of a continuous casting billet tail billet is characterized by consisting of two plug-in units and four undercarriage connecting rod mechanisms;
the two plug-ins comprise a left plug-in and a right plug-in, the left plug-in and the right plug-in are respectively installed on a lifting support frame of the tundish trolley through two undercarriage connecting rod mechanisms respectively and are respectively arranged on two sides of a submerged nozzle of the tundish, and the trolley lifting support frame is positioned at the bottom of the tundish;
the left plug-in and the right plug-in are identical in structure and are collectively called as plug-ins, and two mounting rings are welded and fixed at the top of each plug-in;
the four undercarriage connecting rod mechanisms have the same structure and are respectively connected with the four mounting rings on the two plug-in units in a one-to-one correspondence manner;
every undercarriage connecting rod mechanism comprises plug-in components connecting rod, thrust cylinder, fixed frame and hydro-cylinder connecting rod, wherein: the lower end of the plug-in connecting rod is hinged with a mounting ring on the plug-in through a second shaft pin; the upper end of the plug-in connecting rod is hinged with the fixed frame through a first shaft pin; the middle part of the plug-in connecting rod is hinged with one end of the middle supporting rod through a third shaft pin; the other end of the middle support rod is hinged with one end of the thrust rod and the thrust oil cylinder through a fourth shaft pin; the other end of the thrust rod is hinged with the fixed frame through a fifth shaft pin; the end part of the thrust oil cylinder is connected and installed on the fixed frame by a hinge; the fixed frame is fixed on the support frame of the tundish lifting trolley by bolts.
2. The insert device for preventing the rising of a slab end of a continuous casting slab as claimed in claim 1, wherein:
the interior of the plug-in is a rectangular keel frame formed by welding structural steel; the keel frame is formed by pouring an aluminum-carbon refractory material into a rectangular plug-in unit in a die casting mode, and the bottom of the plug-in unit is provided with a triangular guide structure.
3. The insert device for preventing the rising of a slab end of a continuous casting slab as claimed in claim 2, wherein:
the keel frame is composed of two I-shaped steels and two rectangular steels, the two I-shaped steels are arranged in a vertical parallel mode, the two rectangular steels are supported and welded and fixed on the left side and the right side between the two I-shaped steels, the top of one I-shaped steel on the upper portion is a plug-in piece top, the left direction and the right direction of the plug-in piece top are welded and fixed through the two mounting rings, and the two mounting rings are parallel to each other.
4. The insert device for preventing the rising of a slab end of a continuous casting slab as claimed in claim 2, wherein:
the length of the plug-in unit is 800mm, the height of the plug-in unit is 600mm, the thickness of the plug-in unit is 200mm, and the bottom angle α of the guide structure is 120 degrees.
5. The insert device for preventing the rising of a slab end of a continuous casting slab as claimed in claim 1, wherein:
the undercarriage connecting rod mechanism is characterized in that the action process of the undercarriage connecting rod mechanism is that the plug-in is stretched and contracted from a standby position to a vertical insertion position, the operation process of the thrust oil cylinders is that the pushing-out and withdrawing actions are realized through hydraulic electromagnetic directional valves, and a speed regulating valve is arranged in each hydraulic loop of each thrust oil cylinder, so that the speed and the position of the four thrust oil cylinders are kept synchronous in the pushing-out process.
6. A method for using the insertion device for preventing the rising of the continuous casting billet tail billet, which adopts the insertion device for preventing the rising of the continuous casting billet tail billet according to any one of claims 1 to 5, and is characterized by comprising the following steps:
when the plug-in device is normal, the thrust oil cylinder in the undercarriage connecting rod mechanism is in standby and is in a retraction state, and the plug-in is not inserted into the crystallizer;
when an abnormal condition occurs, lifting a supporting frame of a lifting trolley of a tundish, pulling a molten steel surface in a crystallizer to a position 300mm away from the upper end of the crystallizer, starting a thrust oil cylinder in a landing gear connecting rod mechanism, extending the thrust oil cylinder to enable a plug-in connecting rod, the thrust oil cylinder, a fixed frame and an oil cylinder connecting rod to move through respective hinge structures, enabling two plug-ins to be perpendicular to the tundish and to be flush with an immersion nozzle, aligning the plug-ins to the central position of the crystallizer, enabling the supporting frame of the lifting trolley of the tundish to descend, enabling the plug-ins to be inserted into the crystallizer with the depth of 300mm, enabling the molten steel surface to ascend with the crystallizer, enabling the ascending liquid molten steel to be in contact with a copper plate of the crystallizer, forming a new blank shell of a continuous casting slab with the thickness of 5mm on the surface of the copper plate due to a cooling effect given by the crystallizer, lifting the, the newly extended blank shell enables the tail of the plate blank to leave a space for containing the extruded molten steel; and after the tundish is lifted again, retracting the thrust oil cylinder to enable the plug-in unit to return to the standby position, and cleaning cold steel on the surface of the plug-in unit in time when the tundish lifting trolley supporting frame is off-line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710186456.5A CN108620546B (en) | 2017-03-24 | 2017-03-24 | Plug-in device for preventing continuous casting billet tail billet from rising and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710186456.5A CN108620546B (en) | 2017-03-24 | 2017-03-24 | Plug-in device for preventing continuous casting billet tail billet from rising and using method thereof |
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| CN108620546A CN108620546A (en) | 2018-10-09 |
| CN108620546B true CN108620546B (en) | 2020-03-06 |
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| CN111438343B (en) * | 2019-01-16 | 2021-08-13 | 宝山钢铁股份有限公司 | Tool for preventing continuous casting final pouring rising accident and preventing method thereof |
| CN110976833B (en) * | 2019-11-20 | 2021-07-23 | 河钢乐亭钢铁有限公司 | Quick-change cooling device and quick-change process for large-shrinkage steel grade hot tundish |
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| CN108620546A (en) | 2018-10-09 |
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