CN114485146B - Electric arc furnace wall gun movable support structure based on virtual rotating shaft - Google Patents
Electric arc furnace wall gun movable support structure based on virtual rotating shaft Download PDFInfo
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- CN114485146B CN114485146B CN202111682408.8A CN202111682408A CN114485146B CN 114485146 B CN114485146 B CN 114485146B CN 202111682408 A CN202111682408 A CN 202111682408A CN 114485146 B CN114485146 B CN 114485146B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
- F27B3/22—Arrangements of air or gas supply devices
- F27B3/225—Oxygen blowing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses an electric arc furnace wall gun movable support structure based on a virtual rotating shaft, belongs to the technical field of metallurgical equipment, and solves the technical problems that a furnace wall gun is difficult to install and adjust and a furnace wall is too large in hole in the prior art. The invention provides an electric arc furnace wall gun movable support structure based on a virtual rotating shaft, which comprises a furnace wall gun clamping unit, a sliding unit and a driving unit; the furnace wall gun clamping unit is used for clamping a furnace wall gun body; the sliding unit is fixed on the furnace wall of the electric arc furnace; one end of the driving unit is connected with the furnace wall gun clamping unit, and the other end of the driving unit is connected with one end of the sliding unit; the driving unit is used for driving the furnace wall gun body to slide in the sliding unit around the virtual rotating shaft. The invention simplifies the installation of the gun body, shortens the integral length of the gun body and finally reduces the opening size of the furnace wall of the electric arc furnace by designing the movable bracket structure of the furnace wall gun of the electric arc furnace.
Description
Technical Field
The invention relates to the technical field of metallurgical equipment, in particular to a movable support structure of an electric arc furnace wall gun based on a virtual rotating shaft.
Background
In recent years, the electric arc furnace smelting technology is greatly developed, and the technology such as scrap steel preheating, flat molten pool smelting, scrap steel adding without opening a cover and the like also benefit from the progress of the electric furnace reinforced smelting technology.
At present, the smelting process of an electric arc furnace adopts a multi-point oxygen spraying technology, and oxygen blowing positions are additionally arranged at positions including a furnace door, a furnace wall, a small furnace cover and the like to increase the oxygen consumption so as to achieve the purpose of strengthening smelting.
It should be noted that, because the conventional arc furnace has a low charging amount and a small diameter of the molten bath, a fixed furnace wall lance design is often adopted. However, as the capacity of the electric furnace increases, the diameter of the molten pool increases, the liquid level of the molten pool changes continuously in the smelting process, the fixed furnace wall gun can only be controlled by adjusting the jet intensity because the jet position is fixed, and the large molten pool is not suitable for the requirement of the modern electric arc furnace due to the lack of necessary adjusting means.
Compared with a fixed furnace wall gun, the movable furnace wall gun adopts a movable support design at present, the angle of the oxygen lance can be adjusted according to the furnace condition, but the existing movable support design adopts a solid rotating shaft design, and the opening of the furnace wall is far larger than that of the fixed furnace wall gun, so that the opening of the furnace wall is difficult to block.
The furnace doors and walls are the main leakage points for modern electric furnaces. When the electric furnace dust removal system adopts a negative pressure design for avoiding the escape of smoke dust, because the air pressure in the electric furnace is lower than the atmospheric pressure outside the electric furnace, a large amount of air is gushed from leakage points such as furnace doors, furnace wall openings and the like, and the influence on the atmosphere in the electric furnace is caused. In addition, the waterway circulation design of the water-cooled furnace wall is influenced by the oversize opening of the furnace wall, so that the electric furnaces adopting the movable furnace wall guns are fewer at present.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a movable support structure of an electric arc furnace wall gun based on a virtual rotating shaft, so as to solve the technical problems of the existing movable furnace wall gun that the opening is too large and the plugging is difficult due to the adoption of a solid rotating shaft.
The purpose of the invention is mainly realized by the following technical scheme:
the invention provides an electric arc furnace wall gun movable support structure based on a virtual rotating shaft, which comprises a furnace wall gun clamping unit, a sliding unit and a driving unit, wherein the furnace wall gun clamping unit is arranged on the furnace wall gun sliding unit;
the furnace wall gun clamping unit is used for clamping a furnace wall gun body; the sliding unit is fixed on the furnace wall of the electric arc furnace and is used for matching with the furnace wall gun clamping unit to realize specific track movement;
one end of the driving unit is connected with the furnace wall gun clamping unit, and the other end of the driving unit is connected with one end of the sliding unit; the driving unit is used for driving the furnace wall gun body to slide in the sliding unit around the virtual rotating shaft;
the sliding unit comprises an arc-shaped track, and the curvature center of the arc-shaped track is the virtual rotating shaft. When the sliding unit is designed by adopting the arc track, the circle center of the arc track is the position of the virtual rotating shaft.
In one possible design, the furnace wall gun holding unit comprises a furnace wall gun holding block; the furnace wall gun clamping block is fixedly connected with the furnace wall gun body; a first guide wheel and a second guide wheel are correspondingly arranged on two sides of the furnace wall gun clamping block;
the sliding unit further comprises an arc-shaped track bracket; the arc-shaped track is arranged at one end of the arc-shaped track support and is fixed on the furnace wall of the electric arc furnace through the arc-shaped track support; the circular arc track and the circular arc track support are both arranged along the vertical direction;
the first guide wheel and the second guide wheel are clamped on the circular arc-shaped track and can slide along the circular arc-shaped track; one end of the driving unit is connected with the furnace wall gun clamping block; the other end is connected with the circular arc track bracket.
In one possible design, the other end of the circular arc-shaped track support is provided with an ear seat, and a first pin shaft is arranged on the ear seat; a second pin shaft is arranged at one end of the furnace wall gun clamping block close to the lug seat;
one end of the driving unit is connected with the lug seat of the circular arc track support through a first pin shaft, and the other end of the driving unit is connected with the furnace wall gun clamping block through a second pin shaft.
In one possible design, the arc of the circular arc shaped track is greater than the tilting angle of the lance of the electric arc furnace.
In one possible design, the distance between the virtual rotating shaft and the center of the furnace wall of the electric arc furnace is set to be L, m; the opening height of the furnace wall of the electric arc furnace is H, and the H satisfies the following relational expression:
wherein H is the opening height of the furnace wall of the electric arc furnace, and m; d is the diameter of the furnace wall gun of the electric arc furnace, m; d is the furnace wall diameter of the electric arc furnace, m; alpha is the angle between the furnace wall gun body of the electric arc furnace and the horizontal plane when the furnace wall gun body initially rotates, beta is the angle between the furnace wall gun body of the electric arc furnace and the horizontal plane after the furnace wall gun body rotates from the initial rotation angle alpha, and beta is larger than alpha; l is the distance between the virtual rotating shaft and the center of the furnace wall of the electric arc furnace, m.
In one possible design, the value of the arc furnace wall opening height H is minimal when the distance L between the virtual rotation axis and the center of the arc furnace wall is less than or equal to L0:
wherein H is the opening height of the furnace wall, m; d is the diameter of the furnace wall gun of the electric arc furnace, m; d is the furnace wall diameter of the electric arc furnace, m; alpha is the angle between the furnace wall gun body of the electric arc furnace and the horizontal plane when the furnace wall gun body initially rotates, and beta is the angle formed by the furnace wall gun body of the electric arc furnace after the furnace wall gun body rotates from the initial rotation angle alpha.
In one possible design, the electric arc furnace wall gun body can rotate around virtual rotating shafts, the number of the virtual rotating shafts is n, and n is more than or equal to 1.
In one possible design, the drive unit comprises a hydraulic cylinder; one end of the hydraulic cylinder is connected with the lug seat, and the other end of the hydraulic cylinder is connected with the furnace wall gun clamping block.
In one possible design, the drive unit comprises an electric cylinder; one end of the electric cylinder is connected with the lug seat, and the other end of the electric cylinder is connected with the furnace wall gun clamping block.
In one possible design, the drive unit comprises a pneumatic cylinder; one end of the pneumatic cylinder is connected with the lug seat, and the other end of the pneumatic cylinder is connected with the furnace wall gun clamping block.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
(1) The arc furnace wall gun movable support structure based on the virtual rotating shaft is arranged on the furnace wall through the virtual rotating shaft, so that the size of the opening of the furnace wall can be greatly reduced, and the normal smelting atmosphere in the furnace can be maintained.
(2) Compared with the prior art, on one hand, the movable support structure provided by the invention can fix and support the furnace wall gun of the electric arc furnace; on the other hand, the movable bracket structure of the electric arc furnace wall gun has no solid rotating shaft, so that the movable bracket structure can be arranged at a position where the solid rotating shaft cannot be arranged due to interference.
(3) The arc furnace wall gun movable support structure based on the virtual rotating shaft can enable the furnace wall gun body to realize actions which cannot be finished by the gun body adopting the solid rotating shaft support.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram showing the relationship between the position of the opening in the wall of the electric arc furnace and the position of the virtual shaft;
FIG. 2 is a virtual spindle implementation principle based on a circular arc track;
FIG. 3 is a structural design of a virtual rotating shaft based on a circular arc track;
FIG. 4 is a schematic structural view of a circular arc track and an arc bracket;
FIG. 5 is a schematic view of the construction of a gun block for a furnace wall.
Reference numerals:
1-arc furnace wall gun; 2-furnace wall gun clamping blocks; 3-arc track support; 4-a hydraulic cylinder; 5-ear seat; 6-a first pin shaft; 7-circular arc track; 8-a second pin shaft; 9-first guide wheel.
Wherein H is the opening height of the furnace wall of the electric arc furnace, and m; d is the diameter of the furnace wall gun of the electric arc furnace, m; d is the furnace wall diameter of the electric arc furnace, m; alpha is the angle between the furnace wall gun body of the electric arc furnace and the horizontal plane when the furnace wall gun body initially rotates, beta is the angle formed by the furnace wall gun body of the electric arc furnace rotating from the initial rotation angle alpha, and beta is larger than alpha; l is the distance between the virtual rotating shaft and the center of the furnace wall of the electric arc furnace, m.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention and not to limit its scope.
The design principle of the virtual rotating shaft is as follows: as shown in FIG. 2, AB and CD intersect perpendicularly, and the intersection point E is the midpoint of AB. From the laws of geometry, when AB coincides with a circle of diameter R, the straight line CD must pass through the center O of the circle, independent of the angle θ of the CD. Thus, a CD can be considered to rotate around point O, which is the center of a circular arc with a diameter R, and exists independent of any entity, and can be considered to be a virtual axis of rotation for a linear CD.
Based on the design principle, the invention provides a virtual rotating shaft-based arc furnace wall 1 gun movable support structure, which can realize a rotating function around the virtual rotating shaft, so as to drive the arc furnace wall 1 gun to rotate, the rotating direction does not depend on a certain plane, the number of the virtual rotating shafts is n, and n is more than or equal to 1; it should be noted that the number and the position of the virtual rotating shafts can be set according to actual situations and needs.
Compared with the prior art, the virtual rotating shaft arranged in the invention does not exist in a physical form, and the occurrence of interference can be avoided to the maximum extent. When the number of the virtual shafts is more than 1, the arc furnace wall 1 gun clamped by the arc furnace wall 1 gun movable support structure can rotate around the virtual rotating shaft in space.
What the adoption among the prior art is the movable support of entity pivot structural design, must place outside the water-cooling oven in order to prevent to interfere the pivot, the disadvantage of this kind of structure lies in that 1 rifle of electric arc furnace oven is because the pivot is kept away from the oven when rotatory, rotatory 1 rifle of electric arc furnace oven exists great displacement on the longitudinal direction of 1 openings of electric arc furnace oven, in addition the diameter of 1 rifle bodies of electric arc furnace oven, need reserve sufficient space on the direction of height of electric arc furnace oven 1, otherwise the collision can take place for the rifle bodies of oven and electric arc furnace oven 1, the condition of taking place to interfere.
The electric arc furnace wall 1 gun adopting the virtual rotating shaft design has no physical rotating shaft, so the position of the virtual rotating shaft can be set at will, and when the virtual rotating shaft is coincident with the central line of the electric arc furnace wall 1, the opening height of the electric arc furnace wall 1 is the lowest. Because the position of the virtual rotating shaft can be set and adjusted at will, the furnace wall gun fixed by the furnace wall gun movable support based on the virtual rotating shaft can realize the function which cannot be realized by the conventional fixing mode.
The relationship between the opening size of the furnace wall 1 of the electric arc furnace and the position of the rotating shaft is shown in figure 1, a tubular water-cooled furnace wall is taken as an example in figure 1, and the diameter of a furnace wall water-cooled pipeline is d, m; namely the diameter of the furnace wall 1 of the electric arc furnace is d, m; the diameter of the furnace wall gun is D, m; the distance between the virtual rotating shaft and the center of the furnace wall 1 of the electric arc furnace is L and m; alpha and beta are included angles between a gun body of a gun 1 on the arc furnace wall and a horizontal plane, wherein alpha is the angle between the gun body of the gun 1 on the arc furnace wall and the horizontal plane when the gun body initially rotates, beta is the angle between the gun body of the gun 1 on the arc furnace wall and the horizontal plane after the gun body rotates from an initial rotation angle alpha, and beta is larger than alpha; l is the distance between the virtual rotating shaft and the center of the furnace wall, and m.
Setting the distance between the virtual rotating shaft and the center of the furnace wall of the electric arc furnace as L and m; the opening height of the furnace wall of the electric arc furnace is H, and the H satisfies the following relational expression:
as can be seen from equation (1), the furnace wall opening height H is influenced by the furnace wall lance diameter D, the arc furnace wall 1 diameter D, the lance rotation angles α and β, and the distance L between the virtual rotation axis and the center of the arc furnace wall 1. For a certain gun of the arc furnace wall 1, the diameter D of the gun and the diameter D of the arc furnace wall 1 are fixed values, the opening height of the arc furnace wall 1 is influenced by alpha, beta and L, and for the same rotation angle of the gun system, the distance L from the virtual rotating shaft to the center of the arc furnace wall 1 is mainly influenced.
When the distance L between the virtual rotating shaft and the center of the furnace wall 1 of the electric arc furnace is less than or equal to L0, the height H of the opening of the furnace wall is minimum:
the movable support adopting the solid shaft structure cannot achieve the aim, so that the importance of the virtual rotating shaft is embodied.
The virtual rotating shaft refers to a rotating shaft which is formed by rotating an object around, and does not have an entity, and in order to realize the design that the gun of the electric arc furnace wall 1 rotates around the virtual rotating shaft, the invention provides a movable bracket structure of the gun of the electric arc furnace wall 1 based on the virtual rotating shaft, which comprises a furnace wall gun clamping unit, a sliding unit and a driving unit; the furnace wall gun clamping unit is used for clamping a furnace wall gun body; the sliding unit is fixed on the furnace wall 1 of the electric arc furnace and is used for matching with the furnace wall gun clamping unit to realize specific track movement; one end of the driving unit is connected with the furnace wall gun clamping unit, and the other end of the driving unit is connected with one end of the sliding unit; the driving unit is used for driving the furnace wall gun body to slide in the sliding unit around the virtual rotating shaft.
It should be emphasized that the sliding unit includes a circular arc track 7, and the curvature center of the circular arc track 7 is the virtual rotation axis. When the sliding unit is designed by adopting the circular arc track 7, the circle center of the circular arc track 7 is the position of the virtual rotating shaft.
Specifically, as shown in fig. 3 to 5, the furnace wall gun clamping unit is fixedly connected with one end of the furnace wall gun body in a clamping manner, and the other end of the furnace wall gun body extends into the electric arc furnace; the sliding unit is arranged outside the electric arc furnace and is close to the opening of the furnace wall 1 of the electric arc furnace, and the arc unit is installed along the vertical direction; in addition, one end of the driving unit is connected with the arc-shaped unit, the other end of the driving unit is connected with the furnace wall gun clamping unit, the furnace wall gun body slides along the sliding unit through the telescopic motion of the driving unit, and meanwhile, the movement of rotating around the virtual rotating shaft is achieved.
Compared with the prior art, the driving unit and the sliding unit are arranged, and the driving unit is used for driving the gun on the furnace wall 1 of the electric arc furnace to slide along the sliding unit; meanwhile, the action that the gun of the furnace wall 1 of the electric arc furnace rotates around the virtual rotating shaft can be realized; by rotating the gun body of the furnace wall gun around the virtual rotating shaft instead of the fixed rotating shaft, the rotating point (namely the virtual rotating shaft) of the gun of the furnace wall 1 of the electric arc furnace is close to the furnace wall 1 (water-cooled furnace wall) of the electric arc furnace until the rotating point is positioned at the central line of the furnace wall 1 of the electric arc furnace, so that the requirement of installing the gun of the furnace wall 1 of the electric arc furnace on the opening height of the furnace wall 1 of the electric arc furnace can be greatly reduced.
In addition, the furnace door and the furnace wall of the modern electric arc furnace are the most important leakage points, and when the electric furnace dust removal system adopts negative pressure design for avoiding smoke dust escaping, because the pressure in the furnace is lower than the atmospheric pressure outside the furnace, a large amount of air is caused to flow in from the leakage points such as the furnace door and the open pore of the furnace wall, and the influence is caused to the atmosphere in the furnace. Meanwhile, the waterway circulation design of the water-cooled furnace wall can be influenced by the oversize opening of the furnace wall, so that fewer electric furnaces adopting movable furnace wall guns are needed; the invention can reduce the height of the opening of the furnace wall 1 of the electric arc furnace, and avoid a large amount of air in the electric arc furnace from leaking points such as the furnace door, the opening of the furnace wall and the like to rush in, thereby avoiding the influence on the atmosphere in the furnace, and playing an important role in strengthening smelting and maintaining the atmosphere in the furnace; it should be noted that, because the opening of the electric arc furnace wall 1 of the invention is small, the influence of the excessive opening of the electric arc furnace wall 1 on the design of the water circuit circulation of the water-cooled furnace wall can be avoided.
In order to fix the furnace wall gun so as to realize that the furnace wall 1 of the electric arc furnace rotates around a virtual rotating shaft, the furnace wall gun clamping unit comprises a furnace wall gun clamping block 2; the furnace wall gun clamping block 2 is fixedly connected with the furnace wall gun body; a first guide wheel 9 and a second guide wheel are correspondingly arranged at two sides of the furnace wall gun clamping block 2; the sliding unit is also provided with a circular arc track support 3; the arc-shaped track 7 is arranged at one end of the arc-shaped track support 3, and the arc-shaped track 7 is fixed on the furnace wall 1 of the electric arc furnace through the arc-shaped track support 3; the first guide wheel 9 and the second guide wheel are clamped on the circular arc-shaped track 7 and can slide along the circular arc-shaped track 7; one end of the driving unit is connected with the furnace wall gun clamping block 2; the other end is connected with the circular arc track bracket 3.
Specifically, as shown in fig. 3 to 5, the furnace wall gun clamping unit of the invention comprises a furnace wall gun clamping block 2, wherein a first guide wheel 9 and a second guide wheel are arranged on two sides of the furnace wall gun clamping block 2, the first guide wheel 9 and the second guide wheel penetrate through the bottom of the furnace wall gun clamping block 2, and the penetrating parts of the first guide wheel 9 and the second guide wheel are clamped on a circular arc-shaped rail 7; the arc-shaped track support 3 is detachably connected with the arc furnace wall 1, the arc-shaped track 7 is arranged at one end of the arc-shaped track support 3, one end of the driving unit is connected with the arc-shaped track support 3, the other end of the driving unit is connected with the furnace wall gun clamping block 2, and the furnace wall gun clamping block 2 slides in the arc-shaped track 7 through the penetrating parts of the first guide wheel 9 and the second guide wheel under the driving of the driving unit, so that the furnace wall gun body is driven to rotate around the virtual rotating shaft.
It should be noted that, the other end of the circular arc track support 3 of the present invention is provided with an ear seat 5, and the ear seat 5 is provided with a first pin 6; a second pin shaft 8 is arranged at one end of the furnace wall gun clamping block 2 close to the lug seat 5; one end of the driving unit is connected with the lug seat 5 of the circular arc track support 3 through a first pin shaft 6, and the other end of the driving unit is connected with the furnace wall gun clamping block 2 through a second pin shaft 8.
In order to meet the rotating requirement of the gun of the furnace wall 1 of the electric arc furnace, the radian of the arc-shaped track 7 is larger than the tilting angle of the gun of the furnace wall 1 of the electric arc furnace.
In order to adjust the installation angle of the gun movable support structure of the arc furnace wall 1, the arc track support 3 is detachably connected with the arc furnace wall 1 through a screw and a nut; when the installation angle of the 1 gun on the arc furnace wall needs to be adjusted, the installation angle of the 1 gun movable support on the arc furnace wall can be adjusted by disassembling the screw rod and the nut, and finally, the injection of the 1 gun on the arc furnace wall at different fixed angles is realized.
It should be noted that, in order to realize the variable-angle injection of the gun of the furnace wall 1 of the electric arc furnace in the smelting process, the driving unit of the invention comprises a hydraulic cylinder 4, an electric cylinder and a pneumatic cylinder.
When the hydraulic cylinder 4 is adopted, one end of the hydraulic cylinder 4 is connected with the lug seat 5, the other end of the hydraulic cylinder is connected with the furnace wall gun clamping block 2, and the gun on the furnace wall 1 of the electric arc furnace rotates around the virtual rotating shaft through the extension and retraction of a push rod of the hydraulic cylinder 4.
When adopting electronic jar, the one end and the ear seat 5 of electronic jar are connected, and the other end is connected with oven rifle clamp splice 2, and 1 rifle of electric arc furnace oven is rotated around virtual pivot through the flexible realization electric jar push rod.
When the pneumatic cylinder is adopted, one end of the pneumatic cylinder is connected with the lug seat 5, the other end of the pneumatic cylinder is connected with the furnace wall gun clamping block 2, and the gun on the furnace wall 1 of the electric arc furnace rotates around the virtual rotating shaft through the extension and retraction of a push rod of the pneumatic cylinder.
In conclusion, the gun movable support structure of the electric arc furnace wall 1 is arranged, so that the gun of the electric arc furnace wall 1 can rotate along the virtual rotating shaft; the problem that no entity and no interference exist in the position of the virtual rotating shaft; the position of the virtual rotating shaft is determined by design and is adjusted during installation, and because the rotating point of the furnace wall gun body can be close to the water-cooled furnace wall as much as possible due to the existence of the virtual rotating shaft, the requirement for opening the hole in the furnace wall can be greatly reduced, and the important role in strengthening smelting and maintaining the furnace atmosphere is played.
It should be explained that the virtual rotating shaft of the present invention is not limited to a certain direction and dimension, and the number n of rotating shafts (n ≧ 1) may be increased according to actual requirements to implement some complex actions, such as the furnace wall gun implementing multi-dimensional activities, and therefore the multi-virtual shaft structure is also within the scope of this patent protection.
Example 1
The arc furnace of this embodiment is specifically sized or dimensioned.
Take a 70t electric furnace in a factory as an example. The rated capacity of the electric furnace is 70t, the maximum loading capacity is 100t, the diameter of a molten pool is 4400mm, and the inner diameter of a water-cooled furnace wall of an upper furnace shell is 5600mm. The diameter D phi of the oxygen lance on the furnace wall is 100mm, the diameter of the pipeline on the water-cooled furnace wall of the electric arc furnace is phi 89mm, and the distance between pipelines is 90mm. The common angle of the oxygen lance is 30-45 degrees.
According to the conventional movable support design, the interference rotating shaft for rotating the support is considered to be at least 250mm away from the center line of the furnace wall. As L =250mm, α =30 °, β =45 °, D =100mm, D =89mm. According to the calculation, the critical length L 0 ＝58.02mm，L>L 0 。
For the furnace wall 1 gun of the electric arc furnace determined above, the diameter D of the furnace wall and the diameter D of the furnace wall 1 of the electric arc furnace are fixed values, the opening height of the furnace wall 1 of the electric arc furnace is influenced by α, β and L, while for the same rotation angle of the furnace wall gun system, the distance L from the virtual rotation axis to the center of the furnace wall 1 of the electric arc furnace is mainly influenced.
When the furnace wall gun body rotates from alpha to beta, the height of the opening of the furnace wall 1 of the electric arc furnace is H, and the H satisfies the following relation:
as can be seen from equation (1), the furnace wall opening height H is affected by the furnace wall lance diameter D, the arc furnace wall 1 diameter D, the lance rotation angles α and β, and the distance L between the virtual rotation axis and the center of the arc furnace wall 1.
The minimum opening height H =259.42mm of the furnace wall is calculated when the oxygen lance rotates from alpha to beta. The opening of the coil pipe type water-cooled furnace wall must meet the requirement of the whole pipeline degree, the distance between pipelines is 90mm, and therefore at least 3 layers of pipes need to be removed, namely the actual opening height is 271mm. If considering that the water inlet and return arrangement of the pipelines can only remove even number of pipelines, 4 layers of pipes need to be removed, and the actual opening height is 361mm.
Example 2
The arc furnace parameters were the same as in example 1, which uses a movable support design with a virtual shaft configuration.
The virtual rotating shaft of the arc furnace wall gun of the embodiment is positioned at the center of the arc furnace wall, namely the distance L between the virtual rotating shaft and the center of the arc furnace wall 1 is less than or equal to L 0 At this time, the furnace wall opening height H is minimum:
under the same parameters, the theoretical minimum opening height is calculated to be H =178.29mm, the opening distance is 181mm after two layers of pipes are removed, the moving requirement of the furnace wall gun can be met, the opening height is only 1/2-2/3 of the opening width of the embodiment 1, and the opening height is equivalent to that of a fixed furnace wall gun arranged at 45 degrees.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (7)
1. The electric arc furnace wall gun movable support structure based on the virtual rotating shaft is characterized by comprising a furnace wall gun clamping unit, a sliding unit and a driving unit;
the furnace wall gun clamping unit is used for clamping a furnace wall gun body; the sliding unit is fixed on the furnace wall of the electric arc furnace;
one end of the driving unit is connected with the furnace wall gun clamping unit, and the other end of the driving unit is connected with one end of the sliding unit; the driving unit is used for driving the furnace wall gun body to slide in the sliding unit around the virtual rotating shaft;
the sliding unit comprises an arc-shaped track, and the circle center of the arc-shaped track is positioned on the virtual rotating shaft;
the furnace wall gun clamping unit comprises a furnace wall gun clamping block; the furnace wall gun clamping block is fixedly connected with the furnace wall gun body; a first guide wheel and a second guide wheel are correspondingly arranged on two sides of the furnace wall gun clamping block; the first guide wheel and the second guide wheel penetrate through the bottom of the furnace wall gun clamping block, and the penetrating parts of the first guide wheel and the second guide wheel are clamped on the circular arc-shaped rail;
the sliding unit further comprises an arc-shaped track support; the arc-shaped track support is detachably connected with the furnace wall of the electric arc furnace, the arc-shaped track is arranged at one end of the arc-shaped track support, and the arc-shaped track is fixed on the furnace wall of the electric arc furnace through the arc-shaped track support; the circular arc track and the circular arc track support are both arranged along the vertical direction;
the first guide wheel and the second guide wheel are clamped on the circular arc-shaped track and can slide along the circular arc-shaped track; one end of the driving unit is connected with the furnace wall gun clamping block; the other end is connected with the circular arc track bracket;
under the driving of the driving unit, the furnace wall gun clamping block slides in the arc-shaped track through the penetrating parts of the first guide wheel and the second guide wheel, so that the furnace wall gun body is driven to rotate around the virtual rotating shaft; the other end of the circular arc-shaped track support is provided with an ear seat, and a first pin shaft is arranged on the ear seat; a second pin shaft is arranged at one end, close to the lug seat, of the furnace wall gun clamping block;
one end of the driving unit is connected with the lug seat of the circular arc track support through a first pin shaft, and the other end of the driving unit is connected with the furnace wall gun clamping block through a second pin shaft;
the electric arc furnace wall gun body can rotate around virtual rotating shafts, the number of the virtual rotating shafts is n, and n is larger than or equal to 1.
2. The electric arc furnace wall gun movable support structure based on the virtual rotating shaft as claimed in claim 1, wherein the radian of the circular arc track is larger than the tilting angle of the electric arc furnace wall gun.
3. The electric-arc furnace wall gun movable support structure based on the virtual rotating shaft as claimed in claim 2, wherein the distance between the virtual rotating shaft and the center of the electric-arc furnace wall is set to be L, m; the opening height of the furnace wall of the electric arc furnace is H, and the H satisfies the following relational expression:
wherein H is the opening height of the furnace wall of the electric arc furnace, and m; d is the diameter of the furnace wall gun of the electric arc furnace, m; d is the furnace wall diameter of the electric arc furnace, m; alpha is the angle between the furnace wall gun body of the electric arc furnace and the horizontal plane during initial rotation, beta is the angle between the furnace wall gun body of the electric arc furnace and the horizontal plane after the furnace wall gun body rotates from the initial rotation angle alpha, and beta is larger than alpha; l is the distance between the virtual rotating shaft and the center of the arc furnace wall, m.
4. The electric-arc furnace wall gun movable support structure based on the virtual rotating shaft as claimed in claim 3, characterized in that when the distance L between the virtual rotating shaft and the center of the electric-arc furnace wall is less than or equal to L 0 The value of the furnace wall opening height H of the electric arc furnace is minimum:
wherein H is the opening height of the furnace wall, m; d is the diameter of the furnace wall gun of the electric arc furnace, m; d is the furnace wall diameter of the electric arc furnace, m; alpha is the angle between the furnace wall gun body of the electric arc furnace and the horizontal plane when the furnace wall gun body initially rotates, and beta is the angle formed by the furnace wall gun body of the electric arc furnace after rotating from the initial rotation angle alpha.
5. The virtual rotating shaft-based electric arc furnace wall gun movable support structure according to any one of claims 1 to 4, characterized in that the driving unit comprises a hydraulic cylinder; one end of the hydraulic cylinder is connected with the lug seat, and the other end of the hydraulic cylinder is connected with the furnace wall gun clamping block.
6. The virtual rotating shaft-based electric arc furnace wall gun movable support structure according to any one of claims 1 to 4, characterized in that the driving unit comprises an electric cylinder; one end of the electric cylinder is connected with the lug seat, and the other end of the electric cylinder is connected with the furnace wall gun clamping block.
7. The virtual rotating shaft-based electric arc furnace wall gun movable support structure according to any one of claims 1 to 4, wherein the driving unit comprises a pneumatic cylinder; one end of the pneumatic cylinder is connected with the lug seat, and the other end of the pneumatic cylinder is connected with the furnace wall gun clamping block.
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| EP2080972A1 (en) * | 2008-01-08 | 2009-07-22 | L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Combined burner and lance apparatus for electric arc furnaces |
| ITMI20112020A1 (en) * | 2011-11-07 | 2013-05-08 | Tenova Spa | EQUIPMENT AND METHOD OF POSITIONING LANCE FOR ELECTRIC ARC FURNACE, ELECTRIC ARC FURNACE INCLUDING SUCH EQUIPMENT |
| CN105838844B (en) * | 2016-06-06 | 2017-11-10 | 中冶赛迪工程技术股份有限公司 | A kind of furnace wall gun pendulous device |
| CN215250993U (en) * | 2021-07-26 | 2021-12-21 | 沁阳市宏达钢铁有限公司 | Adjusting device for electric furnace wall oxygen lance |
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