JP3554466B2 - Vacuum refining equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vacuum refining facility used in a vacuum degassing method for molten steel or the like.
[0002]
[Prior art]
Conventionally, there are vacuum smelting facilities B and C in the form shown in FIGS. 13 and 14 as vacuum smelting facilities in which the lower end of a vacuum tank is immersed in molten steel in a smelting pot to suck up the molten steel and degas.
The vacuum refining equipment B shown in FIG. 13 is configured such that the refining pot 100 is pushed up to the vacuum tank 101 using the pot push-up device 102, and the lower end of the vacuum tank 101 is immersed in the molten steel in the refining pot 100.
[0003]
On the other hand, in a vacuum refining facility C shown in FIG. 14, a vacuum chamber 105 is mounted on one end of a swing arm 104 whose center is swingably supported by a support table 103, and the other end of the swing arm 104 A hydraulic cylinder 106 is attached to the apparatus, the vacuum tank 105 is lowered by the operation of the hydraulic cylinder 106, and the lower end is immersed in molten steel in a refining pot 107.
With such a configuration, both of the vacuum smelting facilities B and C can perform degassing by sucking molten steel from the smelting pots 100 and 107.
[0004]
[Problems to be solved by the invention]
However, the above-mentioned conventional vacuum refining facilities B and C still have the following problems to be solved.
That is, as shown in FIG. 13, in the vacuum refining facility B, the refining pot 100 and the molten steel must be pushed up, so that the pot pushing-up device 102 needs a large thrust. The pit for installing the lifting device 102 must also be large. Therefore, the equipment cost of the vacuum refining equipment B is high, and there is a problem in terms of durability of the installation floor.
[0005]
On the other hand, as shown in FIG. 14, in the vacuum refining facility C, the vacuum tank 105 needs to be connected to the vacuum tank 105 using a swivel joint in order to move the vacuum duct 108 up and down following the up and down movement of the vacuum tank 105. The swivel joint needs to be large because a high temperature and a large amount of dust pass therethrough. Further, in order to protect the swivel joint, it is necessary to provide a gas cooler upstream of the swivel joint. Further, usually, an oxygen supply device, an alloy supply device, and the like are attached to the vacuum chamber 105. Therefore, not only the weight of the vacuum chamber 105 but also the heavy objects such as the vacuum duct 108, the swivel joint, the gas cooler, the oxygen supply device, and the alloy supply device must be integrally moved up and down by the hydraulic cylinder 106. The cylinder 106 has increased in size, and the foundation on which the hydraulic cylinder 106 has been installed has also increased in size, so that the equipment cost of the vacuum refining equipment C has become as expensive as the vacuum refining equipment B.
[0006]
Further, in order to replace the vacuum tank 105, it is necessary to separate the vacuum tank 105 from the vacuum refining facility C by another lifting winch and transport the vacuum tank 105 to a repair position, and the supply device of the utility is also complicated. .
[0007]
The present invention has been made in view of such circumstances, and can reduce the equipment cost of a vacuum refining facility by reducing the lifting weight of a vacuum tank elevating device that moves up and down a vacuum tank. It is an object of the present invention to provide a vacuum refining facility that can smoothly carry out repair work.
[0008]
[Means for Solving the Problems]
The vacuum refining equipment according to claim 1, which meets the above object, has a vacuum tank disposed above and below the refining pot so as to be able to move up and down. The lower end of the vacuum tank is immersed in the molten steel of the refining pot to suck up and degas the molten steel. In a vacuum refining facility for performing such operations, a vacuum tank elevating device for elevating and lowering the vacuum chamber along a vertical guide column, and disposed above the vacuum chamber, the upper end of which is slidably connected to a fixed duct and the lower end thereof An opening is provided with a slide duct connected in a mounted state to the upper end opening of the vacuum tank via a seal ring, and a duct lower limit stopper that regulates a lower limit of the slide duct. The slide duct can be moved up and down in conjunction therewith, and the vacuum tank can be separated from the slide duct by a lowering operation of the vacuum tank by a predetermined distance or more.
[0009]
The vacuum refining equipment according to claim 2 is the vacuum refining equipment according to claim 1, wherein the slide duct is slidably fitted to the fixed duct, and a slide fitting surface between the slide duct and the fixed duct. Is provided with an annular seal.
[0010]
The vacuum refining equipment according to claim 3 is the vacuum refining equipment according to claim 1 or 2, wherein an alloy addition chute is attached to a cylindrical connection portion below the slide duct, and the alloy addition chute communicates with the alloy addition device. An upper fixed chute to be connected and a lower elevating chute slidably attached to the upper fixed chute are formed, and a lower end of the lower elevating chute is detachably connected to the cylindrical connecting portion, and the lower elevating chute is The side wall of the chute is fixedly connected to the slide duct.
[0011]
The vacuum smelting equipment according to claim 4 is the vacuum smelting equipment according to any one of claims 1 to 3, wherein a lance insertion opening provided with a sealing device is provided at a top of the cylindrical connection part. A long oxygen lance is attached to the refining pot so as to advance and retreat through the sealing device.
The vacuum refining equipment according to claim 5 is the vacuum refining equipment according to any one of claims 1 to 4, wherein the vacuum tank elevating device includes an elevating table that moves up and down along the vertical guide column. A vacuum tank holding device capable of detachably holding the vacuum tank is attached to the elevating table.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
[0013]
First, the overall configuration of a vacuum refining facility A according to an embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, as shown in FIG. 1, the vacuum refining facility A is installed at one corner of a building 12 configured by connecting upper portions of a plurality of columns 10 with an upper frame 11.
A refining pot transfer cart 14 is mounted on the floor 13, and a refining pot 15 is set on the upper surface of the refining pot transfer cart 14. Above the refining pot 15, a vacuum tank 16 is provided so as to be able to move up and down. The vacuum refining 16 can immerse the lower end into the molten steel 17 of the refining pot 15, suck up the molten steel 17, and perform degassing and the like. it can.
[0014]
On the floor 13, a vertical guide column 18 is provided upright in a state of being juxtaposed to the refining pot transfer cart 14, and an elevating table 19 is attached to the vertical guide column 18 so as to be able to move up and down. As shown in FIG. 1, the elevating table 19 has a vertically elongated elevating frame 20 that is attached to the vertical guide column 18 so as to be able to move up and down. A vacuum vessel mounting beam 21 extending horizontally. A vacuum tank holding device 29 is attached to the front end of the vacuum tank mounting beam 21, and the vacuum tank 16 is detachably attached to the vacuum tank holding device 29.
[0015]
As shown in FIGS. 1 and 2, a vacuum duct 23 is provided above the vacuum chamber 16. The vacuum duct 23 has an upper part fixedly connected to a small horizontal beam 24 forming a part of the building 12 via a bracket 25 and has a telescopic duct 27 at a lower part, and a lower end of the fixed duct 26 at an upper part. And a slide duct 28 having a cylindrical connecting part 22 at the lower part, and a lower end opening of the cylindrical connecting part 22 is provided with a seal ring at an upper end opening of the vacuum chamber 16. It is connected in a mounted state via an O-ring 53 as an example. The slide duct 28 is configured to move up and down together with the cylindrical connecting portion 22 in conjunction with the elevating and lowering of the vacuum chamber 16.
[0016]
As shown in FIGS. 1 and 2, the slide duct 28 is mounted on a duct elevating frame 31, and the duct elevating frame 31 is attached to a fixed vertical support 30 forming a part of the building 12 so as to be able to move up and down. .
As shown in FIG. 1, a lance insertion opening 32 is provided at the top of the cylindrical connecting portion 22, and a long oxygen lance 33 penetrates through the lance insertion opening 32 and can freely advance and retreat toward the refining pot 15. Mounted on. The top of the oxygen lance 33 is mounted on a lance elevating frame 34, and the lance elevating frame 34 is attached to a fixed vertical support 35 forming a part of the building 12 so as to be able to move up and down.
[0017]
As shown in FIG. 3, an alloy addition chute 36 is disposed behind the vacuum duct 23. The alloy addition chute 36 is formed of an upper fixed chute 38 fixedly connected to a horizontal beam 37 forming a part of the building 12, and two lower elevating chutes 39 and 40 slidably mounted on the upper fixed chute 38, The lower end of the lowermost elevating chute 40 at the lowermost stage is detachably connected to the cylindrical connecting portion 22 via a detachable connecting device 41.
[0018]
Next, the configuration of each part of the vacuum refining facility A having the above-described overall configuration will be described in detail with reference to FIGS.
(Vacuum chamber 16)
As shown in FIG. 1, the vacuum chamber 16 is formed of a vertically long cylinder, and has a molten steel inflow space therein. On the other hand, a first receiving bracket 42 gripped by the vacuum tank gripping device 29 and a second receiving bracket mounted on a vacuum tank exchange truck (not shown) are provided on the upper and middle portions of the outer surface of the vacuum chamber 16 respectively. A bracket 43 is attached.
[0019]
(Elevator 19)
As shown in FIG. 1, the lifting frame 20 of the lifting table 19 includes upper and lower guide wheels 44 and 45, and the guide wheels 44 and 45 smoothly move up and down along the vertical guide column 18. .
[0020]
Various types of vacuum tank elevating devices 46 for raising and lowering the elevating table 19 are conceivable. In the present embodiment, the vacuum tank elevating device 46 has a pulley 47 attached to the upper end of the elevating frame 20, and one end thereof is vertically The other end of the wire 48 attached to the upper end of the guide column 18 extends downward and winds around the pulley 47, then extends upward, and winds around the pulley 49 installed at the upper end of the vertical guide column 18. Then, it extends downward and is wound around a take-up winch 50 installed on the floor 13.
[0021]
By operating the take-up winch 50 with this configuration, the elevator 19 can be moved up and down along the vertical guide column 18, and in conjunction with this elevating, the vacuum tank gripping device 29 and the vacuum tank 16 are also integrated. You can go up and down. Further, unlike the conventional case, the vacuum tank lifting device 46 only needs to lift and lower only the vacuum tank gripping device 29 and the vacuum tank 16. The vacuum duct 23, the alloy addition chute 36, which is a heavy material, and the lance lifting device 79 described later Since it is not necessary to move up and down, the driving force can be made as small as possible. That is, the size of the vacuum chamber elevating device 46 can be reduced as much as possible.
[0022]
(Cylindrical connection part 22)
As shown in FIG. 4, the cylindrical connecting portion 22 forms a part of a slide duct 28 described later, and is used for connecting the slide duct 28 to the vacuum chamber 16. As shown in FIG. 2, an annular flange 51 having a water-cooled jacket structure is attached to a lower portion of the tubular connecting portion 22. The annular flange 51 is placed in alignment with the upper surface of an annular flange 52 having a water-cooled jacket structure attached to the top of the vacuum chamber 16.
[0023]
An O-ring 53 made of rubber, which is an example of a seal ring, is mounted between the annular flanges 51 and 52 in order to enhance the sealing performance between the vacuum chamber 16 and the cylindrical connecting portion 22. That is, high airtightness can be obtained by compressing the O-ring 53 by the weight of the cylindrical connecting portion 22. Further, when the inside of the vacuum chamber 16 is decompressed by the vacuum generator, the sealing property between the cylindrical connecting portion 22 and the vacuum chamber 16 is further enhanced.
[0024]
As shown in FIG. 2, a side connection portion 54 is provided on a part of the peripheral wall of the cylindrical connection portion 22, and the main body of the slide duct 28 is continuously connected to the side connection portion 54 in an airtight state. ing. As shown in FIGS. 2, 3, and 7, a lance insertion opening 32, which will be described later, is formed at the top of the cylindrical connecting portion 22.
[0025]
(Vacuum duct 23)
The vacuum duct 23 is used to evacuate the inside of the vacuum chamber 16, and is connected to the vacuum chamber 16 via a cylindrical connecting portion 22 provided at a lower end thereof. It is connected to the.
As shown in FIG. 5, the vacuum duct 23 is configured by a slide duct 28 slidably fitted to the fixed duct 26, and the sealing property between the fixed duct 26 and the slide duct 28 is improved. The following configuration is used to secure them.
[0026]
That is, as shown in FIG. 6, a cylindrical seal portion 57 having upper and lower flanges 55 and 56 is attached to the upper end and the lower end of the slide duct 28. A plurality of annular seals 58 are mounted. The inner surfaces of these annular seals 58 are slidably abutted on the peripheral wall of the fixed duct 26 having a water cooling jacket structure. A thick seal mounting ring 59 having an annular groove on the inner peripheral surface is mounted on the upper flange 55, and is expanded in the annular groove by a pressurized gas supplied from the outside to fix the fixed duct. A tire-like rubber seal 59a pressed on the peripheral wall of the tire 26 is fitted.
As shown in FIG. 6, a plurality of guide rollers 60 are mounted on the upper surface of the seal mounting ring 59 at intervals in the circumferential direction via brackets 61. The outer peripheral surface of each guide roller 60 is It is in rolling contact with the outer peripheral surface of the fixed duct 26.
[0027]
As shown in FIGS. 2 and 3, the telescopic duct 27 forming a part of the fixed duct 26 has bellows 63 and 64 with flanges attached to the upper and lower ends of a main body 62 of the telescopic duct, and a bellows with flange by a tie rod 65. It is constituted by connecting flanges 63 and 64 to each other.
With this configuration, without using a large swivel joint, sufficient sealing performance is ensured, and by allowing not only relative sliding between the fixed duct 26 and the slide duct 28 but also constant relative rotation, It is possible to absorb the misalignment of the core when the cylindrical connecting portion 22 is raised and lowered, that is, the horizontal swing of the vacuum duct 23 with respect to the cylindrical connecting portion 22 in the front-rear and left-right directions. Elevating operation can be ensured.
[0028]
Further, as shown in FIGS. 1 and 2, the duct elevating frame 31 on which the slide duct 28 is mounted is configured to be able to elevate and lower along the fixed vertical support 30 by the duct elevating device 66. That is, the duct elevating device 66 attaches the pulley 67 to the upper end of the duct elevating frame 31, extends the other end of the wire 68 having one end attached to the upper end of the fixed vertical support 30 downward, and winds it around the pulley 67. After being extended upward and wound around a pulley 69 provided at the upper end of the fixed vertical support 30, a take-up winch 71 provided at the upper end of the vertical support 70 erected on the floor 13 It is constituted by winding.
[0029]
By operating the take-up winch 71 with this configuration, the duct elevating frame 31 can be moved up and down along the fixed vertical support 30, and by this elevating, the slide duct 28 can be moved up and down in synchronization with the vacuum chamber 16. Can be.
Note that the slide duct 28 may be mounted on the upper portion of the vacuum chamber 16 together with the cylindrical connecting portion 22 without the need for the duct elevating device 66. Also in this case, the slide duct 28 can be moved up and down in synchronization with the vacuum chamber 16.
[0030]
A duct lower limit stopper 30a is attached to a lower portion of the fixed vertical support 30 to set a lower limit of the duct lifting frame 31. Therefore, the lower limit of the slide duct 28 is regulated, and when the vacuum tank lifting / lowering device 46 is operated to lower the vacuum tank 16, the slide duct 28 is also lowered integrally to the lower limit position. By operating the vacuum tank lifting / lowering device 46 to further lower the vacuum tank 16, that is, when the vacuum tank 16 is lowered by a predetermined distance or more, only the vacuum tank 16 is lowered and the vacuum tank 16 is separated from the cylindrical connecting portion 22, Thereafter, by detaching the vacuum tank 16 from the vacuum tank holding device 29, only the vacuum tank 16 can be loaded on a vacuum tank exchange cart (not shown).
[0031]
(Lance insertion opening 32)
As shown in FIGS. 7 and 8, an annular pedestal 72 having a water-cooled jacket structure is formed on the top of the cylindrical connecting portion 22. A cover plate 73 having a jacket structure is placed so as to be able to freely move away from the edge cutting line 74. An O-ring 72a, which is an example of a sealing device, is interposed between the annular pedestal 72 and the cover plate 73. An opening is provided at the center of the lid plate 73, and a lower end of a cylindrical seal portion 74a, which is an example of a sealing device, is similarly provided on the periphery of the opening. A plurality of annular seals 75 are mounted on the inner surface of the cylindrical seal portion 74a. The inner surfaces of these annular seals 75 are slidably in contact with the outer peripheral surface of the oxygen lance 33.
[0032]
A flange 76 is connected to an upper portion of the cylindrical seal portion 74a, and the flange 76 is connected to a lower end of a suspension chain 77 whose upper end is connected to the lance lifting frame 34. In FIG. 7, reference numeral 78 denotes a chain holding cylinder for accommodating the hanging support chain 77 which is loosened when the oxygen lance 33 is lowered.
With this configuration, the sealing performance between the oxygen lance 33 and the cylindrical connection portion 22 can be sufficiently ensured, and oxygen can be blown to the molten steel 17 in the refining pot 15 under vacuum.
[0033]
As shown in FIG. 1, in the present embodiment, a lance lifting / lowering device 79 that raises / lowers the oxygen lance 33 connects one end of a wire 81 to a bracket 80 provided on an upper portion of the lance lifting / lowering frame 34, and Is wound around a pulley 82 attached to the upper end of the fixed vertical support 35, and then wound around a take-up winch 83 similarly installed at the upper end of the fixed vertical support 35a. I have.
[0034]
(Alloy-added chute 36)
As shown in FIGS. 3 and 9 (a), 9 (b) and 9 (c), the alloy addition chute 36 is a vertically long cylindrical body and has an upper fixed chute 38 whose upper part is connected to the alloy addition device 36a. And two lower elevating chutes 39 and 40, each of which is a vertically elongated cylinder, slidably attached to the upper fixed chute 38, and are formed in a telescopic shape. The lower part of the lower elevating chute 40 in the lower stage is detachably connected. Via a device 41, it is detachably connected to an alloy input port 84 provided on the peripheral wall of the cylindrical connecting portion 22. At the lower end of the upper fixed chute 38 and the upper end of the upper lower elevating chute 39, retaining pieces 38a, 39a are attached, respectively, and the lower end of the upper lower elevating chute 39 and the upper end of the lower lower elevating chute 40 Are provided with retaining pieces 39b and 40a, respectively.
[0035]
The side wall of the lower elevating chute 40 is fixedly connected to the slide duct 28 of the vacuum duct 23 by two connecting arms 85.
With this configuration, not only the cylindrical connecting portion 22 and the slide duct 28 but also the lower elevating chutes 39 and 40 can be integrally raised and lowered in conjunction with the elevating and lowering of the vacuum chamber 16. At this time, since the alloy addition device 36a is connected to the upper fixed chute 38 in communication, the alloy can be charged into the molten steel 17 in the refining pot 15 while the vacuum chamber 16 is held at an arbitrary height position. .
[0036]
In the present embodiment, the detachable connecting device 41 for detachably connecting the lower elevating chute 40 at the lower stage to the alloy input port 84 of the tubular connecting portion 22 has the following configuration. That is, as shown in FIG. 3, the alloy inlet port 84 of the tubular connecting portion 22 is closed by the lid 84a when the alloy is not charged into the refining pot 15 or the vacuum tank 16. When the alloy is charged, the lid 84a is turned by the turning device 84b to open the alloy input port 84. At the lower end of the lower lower elevating chute 40, an upper end of an inclined fixed cylinder 41a whose tip extends toward an alloy inlet 84 is continuously provided. A connecting cylinder 41c having 41b is slidably mounted, and this annular flange 41b is pressed against the corresponding annular flange 84c of the alloy inlet 84 by the drive cylinders 41d and 41e.
[0037]
(Vacuum tank holding device 29)
As shown in FIGS. 1 and 10, in the vacuum chamber holding device 29, the base of a vacuum chamber mounting plate 86 formed of a rectangular plate is fixedly connected to the front end of the vacuum chamber mounting beam 21 of the elevating table 19. In addition, an opening 87 through which the vacuum chamber 16 is inserted is provided at the tip of the vacuum chamber mounting plate 86. The opening 87 is provided with three receiving bracket through-grooves 87a to 87c at intervals in the circumferential direction. The receiving bracket through-grooves 87a to 87c are closed by turning receiving seats 88a to 88c formed of rectangular plates, respectively.
[0038]
Further, these swivel receiving seats 88a to 88c are configured to be swivelable around pivots 90a to 90c by swivel cylinders 89a to 89c, and a vacuum tank receiving position indicated by a solid line in FIG. It will be turned between the insertion position. Then, after the swivel cylinders 89a to 89c are operated to move the swivel receiving seats 88a to 88c to the vacuum tank insertion position, the vacuum tank mounting plate 86 is lowered to receive the first receiving bracket 42 of the vacuum chamber 16 as a bracket. After descending to a position above the vacuum chamber mounting plate 86 through the through grooves 87a to 87c, and thereafter operating the swivel cylinders 89a to 89c to move the swivel receiving seats 88a to 88c to the vacuum chamber mounting position, the vacuum chamber mounting is performed. The vacuum chamber 16 can be mounted on the vacuum chamber mounting plate 86 by raising the plate 86 and bringing the lower surface of the first receiving bracket 42 into contact with the upper surfaces of the swivel receiving seats 88a to 88c.
[0039]
Further, in the present embodiment, as shown in FIGS. 10 and 11, there are provided clamping devices 91a to 91c for fixing the swivel receiving seats 88a to 88c at the vacuum tank receiving position. Each of the clamp devices 91a to 91c is substantially composed of an air cylinder 92 and a clamp piece 94 which is fitted into a clamp piece fitting hole 93 provided in a side wall of each of the turning receiving seats 88a to 88c.
[0040]
Further, in the present embodiment, as shown in FIGS. 10 and 12, the vacuum chamber 16 is provided with a horizontal pressing force on the vacuum chamber mounting plate 86 so as to protrude from each of the swivel receiving seats 88 a to 88 c. Positioning devices 96a and 96b are mounted on the L-shaped stopper plates 95a to 95c for pressing the first receiving bracket 42 attached to the vacuum chamber 16 and positioning and fixing the vacuum chamber 16. . Each of the positioning devices 96a and 96b is substantially composed of an electric cylinder 97 and a pressing rod 99 capable of pressing the outer peripheral wall 98 of the vacuum chamber 16.
[0041]
With this configuration, the vacuum chamber 16 can be securely mounted and fixed at a predetermined position on the vacuum chamber mounting plate 86.
When the vacuum tank 16 is replaced by loading the vacuum tank holding device 29 on the elevating table 19, the vacuum tank 16 is loaded on a vacuum tank receiving device such as a ground-side vacuum tank exchange cart, and then, The vacuum chamber 16 can be easily replaced by opening the vacuum chamber holding device 29 and separating the vacuum chamber 16 from the elevating table 19. On the other hand, the operation of mounting the vacuum chamber 16 on the elevating table 19 can be easily performed by performing the above operation in reverse order.
2 and 3, reference numeral 99a denotes an air cylinder for clamping the lid plate 73 to the annular pedestal 72 at the lance insertion opening 32.
[0042]
Next, a molten steel refining operation using the vacuum refining equipment A having the above-described configuration will be described below with reference to FIGS.
First, the refining pot 15 is transferred from the converter to the refining pot transfer cart 14 to immediately below the vacuum tank 16. Next, the vacuum tank lifting device 46 is operated to lower the vacuum tank 16 together with the lifting table 19, and the lower part is immersed in the molten steel 17 in the refining pot 15. At this time, the duct elevating device 66 also operates in conjunction with it, and the slide duct 28 and the cylindrical connecting portion 22 integral with the slide duct 28 also descend in synchronization with the vacuum tank 16, and the vacuum tank 16 and the slide duct 28 The airtight state can be maintained. Thereafter, the inside of the vacuum chamber 16 is evacuated through the vacuum duct 23 to suck the molten steel 17 into the vacuum chamber 16 to perform degassing.
[0043]
After the smelting and refining operation is completed, the vacuum tank raising and lowering device 46 is operated to move up the vacuum tank 16, and the smelting pot transfer cart 14 transfers the smelted steel to a place where the next process is performed, and from the converter. The new smelting pot 15 is transferred to a position directly below the vacuum tank 16 on the smelting pot transfer cart 14, and the smelting operation can be performed in the same manner.
[0044]
When the vacuum tank 16 is melted and needs to be replaced, the vacuum tank 16 is loaded on a vacuum tank receiving device such as a ground-side vacuum tank exchange cart, and then the vacuum tank gripping device 29 is opened. By separating the vacuum chamber 16 from the lift 19, the vacuum chamber 16 can be easily replaced.
[0045]
As described above, the present invention has been described with reference to one embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and is described in the claims. Other embodiments and modifications that can be considered within the scope of the present invention are also included.
[0046]
【The invention's effect】
In the vacuum refining equipment according to claims 1 to 5, the fixed duct located above and the vacuum tank which is raised and lowered by the vacuum tank lifting / lowering device are connected via the slide duct. The airtightness between the slide duct and the vacuum chamber can be ensured only by the vacuum force generated in the vacuum chamber, eliminating the need for a large swivel joint as in the past, and the vacuum chamber required to raise and lower the vacuum chamber. The lifting device can be reduced in size, and the equipment cost of the vacuum refining equipment can be reduced.
[0047]
In addition, since the lower limit of the slide duct is regulated by the duct lower limit stopper, the vacuum tank can be easily separated from the slide duct and placed on the vacuum tank exchange cart by lowering the vacuum tank by a predetermined distance or more. The repair work of the vacuum tank can be performed quickly and smoothly.
[0048]
In the vacuum refining equipment according to claim 2, the slide duct is slidably fitted to the fixed duct, and an annular seal is interposed between the slide fitting surface of the slide duct and the fixed duct. , And the airtightness of the vacuum duct can be ensured.
[0049]
In the vacuum refining facility according to the third aspect, since the alloy addition device is connected to the tubular connection portion below the slide duct through the expandable alloy addition chute, the vacuum tank is held at an arbitrary height position. In this state, the alloy can be added to the molten steel in the smelting pot.
[0050]
In the vacuum refining equipment according to claim 4, a lance insertion opening provided with a sealing device is provided at the top of the cylindrical connection portion, and a long oxygen lance is attached to the refining pot so as to advance and retreat through the sealing device. Therefore, oxygen can be blown to the molten steel in the smelting pot while maintaining a sufficient vacuum.
[0051]
In the vacuum refining equipment according to the fifth aspect, the vacuum tank holding device capable of detachably holding the vacuum tank is attached to the elevating table. Therefore, when replacing the vacuum tank, the vacuum tank receiving device on the ground side is used. After loading the vacuum tank, the vacuum tank holding device can be opened and the vacuum tank can be separated from the elevator, and when loading the vacuum tank on the elevator, the vacuum tank holding device can be easily used. Can be mounted on a lifting platform. Therefore, the repair work of the vacuum chamber can be easily performed.
[Brief description of the drawings]
FIG. 1 is a front view showing the overall configuration of a vacuum refining facility according to an embodiment of the present invention.
FIG. 2 is an enlarged front view of the main part.
FIG. 3 is an enlarged side view of the main part.
FIG. 4 is a longitudinal sectional view of a slide duct.
FIG. 5 is an explanatory view of a sliding state of a slide duct with respect to a fixed duct.
FIG. 6 is an explanatory diagram of an enlarged structure of a sliding portion between a fixed duct and a slide duct.
FIG. 7 is a front sectional view of a lance insertion opening.
FIG. 8 is a plan view of the same.
FIG. 9 is an explanatory diagram of an expansion / contraction operation of an alloy addition chute.
FIG. 10 is a plan view of the vacuum chamber holding device.
FIG. 11 is an enlarged explanatory view of the main part.
FIG. 12 is an enlarged explanatory view of the main part.
FIG. 13 is an explanatory diagram of the entire configuration of a conventional vacuum refining facility.
FIG. 14 is an explanatory diagram of the overall configuration of a conventional vacuum refining facility.
[Explanation of symbols]
A vacuum refining equipment 10 pillars
11 Upper frame 12 Building
13 Floor surface 14 Refining pot transfer cart
15 Refining pot 16 Vacuum tank
17 Molten steel 18 Vertical guide support
19 Elevating table 20 Elevating frame
21 Vacuum chamber mounting beam 22 Cylindrical connection
23 Vacuum duct 24 Small horizontal beam
25 Bracket 26 Fixed duct
27 Telescopic duct 28 Slide duct
29 Vacuum tank holding device 30 Fixed vertical support
30a Duct lower limit stopper 31 Duct lifting frame
32 Lance insertion opening 33 Oxygen lance
34 Lance lifting frame 35 Fixed vertical support
35a Fixed vertical support 36 Alloy added chute
36a Alloy adding device 37 Horizontal beam
38 upper fixed chute 38a retaining piece
39 Lower elevating chute 39a Retaining stopper
39b retaining piece 40 lower elevating chute
40a Retaining prevention piece 41 Detachable connection device
41a Fixed inclined cylinder 41b Annular flange
41c Connecting cylinder 41d Driving cylinder
41e Drive cylinder 42 First receiving bracket
43 second receiving bracket 44 guide wheel
45 Guide wheel 46 Vacuum tank lifting device
47 Pulley 48 Wire
49 Pulley 50 Winding winch
51 annular flange 52 annular flange
53 O-ring 54 Side connection
55 Upper flange 56 Lower flange
57 Cylindrical seal 58 Ring seal
59 Seal mounting ring 59a Rubber seal
60 Guide roller 61 Bracket
62 Telescopic duct body 63 Bellows with flange
64 Bellows with flange 65 Tie rod
66 Duct elevating device 67 Pulley
68 wire 69 pulley
70 Vertical prop 71 Winding winch
72 annular base 72a O-ring
73 Lid plate 74 Edge cutting line
74a cylindrical seal part (seal device) 75 annular seal
76 Flange 77 Suspension chain
78 Chain holding cylinder 79 Lance lifting device
80 Bracket 81 Wire
82 Pulley 83 Winding winch
84 alloy inlet 84a lid
84b Swivel device 84c Annular flange
85 Connecting arm 86 Vacuum tank mounting plate
87 opening 87a receiving bracket through groove
87b Groove for receiving bracket 87c Groove for receiving bracket
88a Swivel support 88b Swivel support
88c Swivel seat 89a Swivel cylinder
89b Swivel cylinder 89c Swivel cylinder
90a Axis 90b Axis
90c Axis 91a Clamping device
91b Clamping device 91c Clamping device
92 Air cylinder 93 Clamp piece insertion hole
94 Clamp piece 95a Stopper plate
95b Stopper plate 95c Stopper plate
96a Positioning device 96b Positioning device
97 Electric cylinder 98 Outer wall
99 Press rod 99a Air cylinder

Claims (5)

In a vacuum smelting facility in which a vacuum tank is disposed at the top of the smelting pot so as to be able to move up and down, and the lower end of the vacuum tank is immersed in the molten steel of the smelting pot to suck up the molten steel and degas, etc.
A vacuum tank lifting / lowering device for raising and lowering the vacuum tank along a vertical guide column; and a vacuum tank lifting / lowering device disposed above the vacuum tank, wherein an upper part is slidably connected to a fixed duct and a lower end opening is an upper end of the vacuum tank. A slide duct connected to the opening via a seal ring in a mounted state, and a duct lower limit stopper for restricting a lower limit of the slide duct, and moving up and down the slide duct in conjunction with the elevation of the vacuum chamber Vacuum refining equipment, wherein the vacuum tank can be separated from the slide duct by lowering the vacuum tank by a predetermined distance or more. 2. The vacuum according to claim 1, wherein the slide duct is slidably fitted to the fixed duct, and an annular seal is provided on a slide fit surface between the slide duct and the fixed duct. Refining equipment. An alloy addition chute is attached to a lower cylindrical connection portion of the slide duct, the alloy addition chute is connected to an alloy addition device, and an upper fixed chute and a lower lift chute slidably attached to the upper fixed chute. The lower end of the lower elevating chute is detachably connected to the cylindrical connecting portion, and a side wall of the lower elevating chute is fixedly connected to the slide duct. 2. The vacuum refining equipment according to 2. A lance insertion opening provided with a sealing device is provided at the top of the cylindrical connection portion, and a long oxygen lance is attached to the refining pot so as to be able to advance and retreat through the sealing device. Item 4. A vacuum refining facility according to any one of Items 1 to 3. The vacuum tank lifting / lowering device includes a lifting / lowering table that moves up and down along the vertical guide column, and a vacuum tank holding device capable of detachably holding the vacuum tank is attached to the lifting / lowering table. Item 5. The vacuum refining equipment according to any one of Items 1 to 4.

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