CN111578719B - Sealing device for electric furnace electrode - Google Patents
Sealing device for electric furnace electrode Download PDFInfo
- Publication number
- CN111578719B CN111578719B CN202010549811.2A CN202010549811A CN111578719B CN 111578719 B CN111578719 B CN 111578719B CN 202010549811 A CN202010549811 A CN 202010549811A CN 111578719 B CN111578719 B CN 111578719B
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- electrode
- shell
- electric furnace
- sealing
- sealing device
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- 238000007789 sealing Methods 0.000 title claims abstract description 133
- 239000011449 brick Substances 0.000 claims abstract description 35
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 238000007906 compression Methods 0.000 claims description 16
- 230000006835 compression Effects 0.000 claims description 16
- 239000011819 refractory material Substances 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 25
- 229910002804 graphite Inorganic materials 0.000 abstract description 25
- 239000010439 graphite Substances 0.000 abstract description 25
- 230000000694 effects Effects 0.000 abstract description 6
- 239000002910 solid waste Substances 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000007907 direct compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/08—Heating by electric discharge, e.g. arc discharge
- F27D11/10—Disposition of electrodes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/12—Arrangements for cooling, sealing or protecting electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention relates to an electric furnace electrode sealing device, and belongs to the field of electrode configuration. The inside insulating, heat-resisting electrode hole brick that is provided with of base and base pass through insulating connection and bell fixed, and A type briquetting, B type briquetting, inner seal circle and the outer sealing washer cooperation in the seal tube constitute a set of labyrinth seal device, and inboard flexible sealing circle and graphite electrode direct contact are responsible for graphite electrode's dynamic seal. The sealing cylinder is fixed on the base through the clamping buckle, so that the problem that the graphite electrode is not easy to center with the electrode hole of the base below can be solved during installation; the elastic pressing device can adjust the pressure of the pressing block in the sealing cylinder on the flexible inner sealing ring and the flexible outer sealing ring, so as to adjust the tightness degree of the contact between the sealing ring and the electrode, and achieve the effect of sealing adjustment. The electrode sealing device has compact structure and convenient adjustment and maintenance, solves the problem of dynamic sealing of the electrode of the solid waste recycling electric furnace at high temperature under electrification, and realizes closed smelting in the furnace.
Description
Technical Field
The invention belongs to the field of electrode configuration, and particularly relates to an electrode sealing device of a solid waste recycling electric furnace.
Background
The traditional metallurgical electric furnace has low requirements on the tightness of electrode holes, such as a steelmaking electric arc furnace and a ladle refining furnace, and is provided with an integral small refractory furnace cover at the electrode hole of the furnace cover so as to play roles in insulating, heat insulation and splash prevention of the electrode, and the electrode hole is also provided with a large gap for preventing the electrode from moving and colliding with the small refractory furnace cover.
The traditional iron alloy submerged arc furnace has larger size, when the diameter of the used electrode is a graphite electrode, the diameter is generally more than phi 700mm, and when a self-baking electrode is used, the diameter can reach phi 2000mm, so that the appearance of various electrode sealing devices of the type of furnace is also large; in addition, the internal structure of the electrode sealing device of the submerged arc furnace is complex, most of the electrode sealing device consists of a water cooling jacket, refractory bricks, nitrogen seals, compression springs and the like, and the sealing device can play roles in insulation and heat insulation, but the problems that the follow-up performance of the sealing device (following electrode) is poor and the compression effect of the compression springs is not ideal generally exist due to the fact that the shape of the sealing device is huge and the self weight of the sealing device is heavy, gaps are formed on the sealing surface of an electrode hole when the electrode moves for a long time, smoke leakage is generated, and the submerged arc furnace mostly works in a semi-closed state at present. The solid waste recycling electric furnace is relatively small, so that the traditional ferroalloy submerged arc furnace electrode sealing device is directly used or scaled down and is not applicable.
Compared with the traditional metallurgical electric furnace, the solid waste recycling electric furnace has small relative performance, the electrodes are mostly graphite electrodes with the diameter phi below 300mm, the treatment objects are solid waste and dangerous waste, the requirements on the tightness of the furnace are high, and the traditional electrode sealing device cannot meet the requirements, so that a novel electrode sealing device is needed to solve the problem of follow-up sealing of small-diameter electrodes at high temperature and under electrification.
Disclosure of Invention
In view of the above, the invention aims to provide an electric furnace electrode sealing device, which solves the problem of the follow-up sealing of a medium-and-small-diameter electrode at high temperature and under electrification.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The sealing device for the electric furnace electrode comprises a sealing cylinder arranged above a furnace cover of the electric furnace, wherein the sealing cylinder comprises a shell I, a pressing block group and a nitrogen sealing device; the shell I is of a cylindrical structure, an annular bottom plate is arranged at the lower port of the shell I, an upper flange I extending outwards is arranged at the upper port of the shell I, a plurality of press block groups are stacked above the bottom plate at the inner side of the shell I, and a nitrogen sealing device is arranged between the press block groups; the pressing block group comprises an A-type pressing block and a B-type pressing block which are correspondingly matched, the matching surfaces of the A-type pressing block and the B-type pressing block are concave-convex surfaces, and an inner sealing ring and an outer sealing ring are clamped between the matching surfaces.
The device also comprises a base and an elastic pressing device; the base includes cylindric casing II and winds casing II ring and establish the electrode hole brick in casing II inner wall department, and casing II's last port corresponds with lower port department and is equipped with the flange II and lower flange II that outwards extends, and wherein lower flange II is connected with the electrode hole flange seat insulation of electric stove bell, and last flange II can dismantle with the bottom plate of casing I through the clamp buckle and be connected.
The elastic pressing device comprises a pressing plate, a tension bolt and a combined disc spring, wherein the pressing plate is pressed at the top of the pressing block group and is connected with the upper flange I through the tension bolt, the combined disc spring is sleeved on the tension bolt, and two end faces of the combined disc spring correspondingly prop up between the upper flange I and the head of the tension bolt.
Further, the electrode Kong Zhuanxing arranged around the inner wall of the shell II is in a pipe body structure with an end cover part, wherein the lower end surface of the end cover part arranged corresponding to the shell II is pressed above an electrode hole flange seat of the electric furnace cover, and the pipe body below the end cover part extends into the electric furnace from a port of the electrode hole flange seat along the axial direction of the electrode; the electrode hole bricks are insulating refractory bricks.
Further, the upper end face of the end cover part of the electrode hole brick is not higher than the upper end face of the upper flange II, and the end head of the electrode hole brick pipe body extending into the electric furnace extends out of the furnace cover refractory material or is flush with the thickness of the furnace cover refractory material; a gap exists between the inner wall surface of the pipe body structure formed by the electrode hole bricks and the electrode.
Further, a ceramic fiber felt is filled in the gap between the electrode hole brick and the inner wall surface of the shell II.
Further, both the A-type pressing block and the B-type pressing block are made of insulating refractory materials.
Further, the A-type pressing block is of a convex structure, the B-type pressing block is of a cross structure, the inner side and the outer side of the A-type pressing block which are stacked with each other correspond to form an inner ring concave space and an outer ring concave space, the inner sealing ring is filled in the inner ring concave space to be matched with the electrode, and the outer sealing ring is filled in the outer ring concave space to be matched with the inner wall surface of the shell I.
Further, the inner sealing ring is in extrusion contact with the electrode, and the outer sealing ring is in extrusion contact with the inner wall surface of the shell I.
Further, a plurality of groups of clamping buckles are arranged on the upper flange II at intervals around the circumference of the shell II; each clamping buckle comprises a compression bolt and a C-shaped bracket, the lower end of the C-shaped bracket is fixedly connected to the upper flange II, and the compression bolt penetrates through the upper end of the C-shaped bracket and is propped against the bottom plate of the shell I.
Further, an insulating pad is arranged between the lower flange II of the shell II and the electrode hole flange seat of the electric furnace cover, a bolt connecting hole is correspondingly formed in the lower flange II and the electrode hole flange seat, the lower flange II and the electrode hole flange seat are connected through a bolt, and an insulating sleeve is arranged in the bolt connecting hole.
Further, the nitrogen sealing device is an annular tube made of heat-resistant stainless steel, a nitrogen inlet is arranged outside the annular tube, and a plurality of air outlet small holes are uniformly distributed on the inner circumference of the annular tube.
The invention has the beneficial effects that:
(1) The base is fixed with the furnace cover through insulating connection on one hand, and insulation between the upper sealing cylinder and the furnace cover is realized on the other hand; the insulating and heat-resistant electrode hole bricks are arranged in the base, so that the isolation of main smoke and heat in a hearth can be realized, and the insulation of the sealing cylinder to the graphite electrode can be realized.
(2) A type briquetting, B type briquetting, interior sealing washer and outer sealing washer cooperation in the seal tube constitute a set of labyrinth seal, and inboard flexible sealing washer and graphite electrode direct contact are responsible for the dynamic seal of graphite electrode, and outside flexible sealing washer and compact brick (A type briquetting, B type briquetting) are responsible for the sealed of seal tube inner space, and inside and outside flexible sealing washer and briquetting combination design be multilayer structure, have formed the multistage sealed face that has certain flexibility.
(3) The nitrogen sealing device generates air seal in the partial space in the sealing cylinder, so that the flue gas in the furnace can be prevented from overflowing along the gap.
(4) The sealing cylinder is fixed on the base through the clamping buckle, and after the clamping buckle is removed, the sealing cylinder can integrally move along with the electrode, so that the problem that the graphite electrode is difficult to center with an electrode hole of the base below can be solved during installation.
(5) The tightness degree of the tension bolt is adjusted, the pressure of the pressing block in the sealing cylinder on the flexible inner sealing ring and the flexible outer sealing ring can be adjusted, and the tightness degree of the sealing ring in contact with the electrode is adjusted, so that the sealing effect is adjusted.
In general, the electrode sealing device has compact structure and convenient adjustment and maintenance, solves the problem of dynamic sealing of the electrode of the solid waste recycling electric furnace at high temperature and under electrification, and realizes closed smelting in the furnace.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural view of an electrode sealing device of the electric furnace;
FIG. 2 is a schematic view of a base;
FIG. 3 is an enlarged view of portion A of FIG. 1;
FIG. 4 is a schematic structural view of a seal cartridge;
FIG. 5 is a top view of FIG. 1;
fig. 6 is an enlarged view of a portion B of fig. 1;
fig. 7 is an enlarged view of a portion C of fig. 1.
Reference numerals:
The electrode hole flange seat 1, the base 2, the clamping buckle 3, the sealing cylinder 4, the elastic pressing device 5, the graphite electrode 6 and the furnace cover refractory material 7;
the base is provided with: a casing II 21, an electrode hole brick 22, an insulating pad 23, bolts 24, an insulating sleeve 25, a ceramic fiber mat 26, an upper flange II 211, a lower flange II 212 and an end cover part 221;
Clamping buckle: a compression bolt 31, a C-shaped bracket 32;
In the sealing cylinder: the nitrogen gas sealing device comprises a shell I41, a nitrogen sealing device 42, an A-shaped pressing block 43, a B-shaped pressing block 44, an inner sealing ring 45, an outer sealing ring 46, a bottom plate 411, an upper flange I412 and a nitrogen gas inlet 421;
In the elastic pressing device: a pressing plate 51, a tension bolt 52 and a combined disc spring 53.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1, the electric furnace electrode sealing device comprises a sealing cylinder 4 arranged above a furnace cover of an electric furnace, wherein the sealing cylinder 4 comprises a shell I41, a pressing block group and a nitrogen sealing device 42; the shell I41 is of a cylindrical structure, an annular bottom plate 411 is arranged at the lower port of the shell I41, an upper flange I412 extending outwards is arranged at the upper port of the shell I41, a plurality of press block groups are stacked above the bottom plate 411 at the inner side of the shell I41, and the nitrogen sealing device 42 is arranged between the press block groups; the press block group comprises an A-type press block 43 and a B-type press block 44 which are correspondingly matched, the matching surfaces of the A-type press block 43 and the B-type press block 44 are concave-convex surfaces, and an inner sealing ring 45 and an outer sealing ring 46 are clamped between the matching surfaces. The device also comprises a base 2 and an elastic pressing device 5; the base 2 comprises a cylindrical shell II 21 and electrode hole bricks 22 which are annularly arranged at the inner wall of the shell II 21 around the shell II 21, an upper flange II 211 and a lower flange II 212 which extend outwards are correspondingly arranged at the upper port and the lower port of the shell II 21, wherein the lower flange II 212 is in insulating connection with the electrode hole flange seat 1 of the electric furnace cover, and the upper flange II 211 is detachably connected with the bottom plate 411 of the shell I41 through a clamping buckle 3. The elastic pressing device 5 comprises a pressing plate 51, a tension bolt 52 and a combined disc spring 53, wherein the pressing plate 51 is pressed on the top of the pressing block set and is connected with the upper flange I412 through the tension bolt 52, the combined disc spring 53 is sleeved on the tension bolt 52, and two end faces of the combined disc spring 53 correspondingly prop up between the upper flange I412 and the head of the tension bolt 52.
Specifically, referring to fig. 2, the electrode hole bricks 22 provided around the inner wall of the case ii 21 form a tube structure having an end cap portion 221, wherein the lower end face of the end cap portion 221 provided corresponding to the case ii 21 is pressed above the electrode hole flange seat 1 of the furnace lid of the electric furnace, and the tube portion below the end cap portion 221 extends from the electrode hole flange seat 1 port all the way into the electric furnace in the electrode axial direction; the electrode aperture brick 22 is an insulating refractory brick.
The upper end surface of the end cap 221 in the electrode brick 22 is not higher than the upper end surface of the upper flange ii 211, and is preferably arranged flush so as to achieve a tight fit with the bottom plate 411 in the case i 41. The end of the electrode hole brick pipe body extending into the electric furnace can extend out of the furnace cover refractory material 7 or be flush with the thickness of the furnace cover refractory material 7, namely, the pipe opening at the lowest end of the electrode hole brick pipe body is required to pass over the inner surface of the furnace cover refractory material 7 or be flush with the inner surface. The graphite electrode 6 is inserted into the pipe body structure formed by the electrode hole bricks.
In the base 2, a shell II 21 is a copper steel shell made of heat-resistant stainless steel and is fixed on an electrode hole flange seat 1 through insulating connection; the electrode hole bricks 22 in the shell II 21 are special-shaped and high-temperature resistant insulating refractory bricks, and the electrode hole bricks 22 extending into the furnace are sleeved on the graphite electrode 6 and pressed on the electrode hole flange seat 1, so that the charged graphite electrode 6 and high-temperature flue gas in the furnace can be isolated from the outside, and the effects of insulation and heat insulation are achieved. An appropriate gap is reserved between the inner wall of the pipe body structure formed by the electrode hole bricks 22 and the graphite electrode 6, and the size of the gap is determined according to the horizontal shaking displacement amount of the graphite electrode 6 during operation.
The insulation connection in this solution is realized by an insulation pad 23, an insulation sleeve 25. Specifically, referring to fig. 3, an insulating pad 23 is arranged between a lower flange ii 212 of a housing ii 21 and an electrode hole flange seat 1 of an electric furnace cover, bolt connection holes are correspondingly formed in the lower flange ii 212 and the electrode hole flange seat 1 and are connected through bolts 24, and an insulating sleeve 25 is arranged in each bolt connection hole. An insulating pad 23 is arranged between the upper flange surface and the lower flange surface which are connected, an insulating sleeve 25 is arranged in the bolt connecting hole, and after the bolts are screwed, the upper shells of the base 2, the sealing cylinder 4 and the like are insulated from the electrode hole flange seat 1.
The gap between the electrode hole brick 22 and the inner wall surface of the shell II 21 is preferably filled with a ceramic fiber felt 26, and the ceramic fiber felt 26 can prevent the flue gas from overflowing.
Referring to fig. 4, both the a-type compacts 43 and the B-type compacts 44 are made of insulating refractory material. The a-type pressing block 43 in this embodiment is a torus, the cross section of which is in a convex shape, and the B-type pressing block is also a torus, the cross section of which is in a cross shape. The inner and outer sides of the a-type pressing block 43 and the B-type pressing block 44 which are stacked on each other are respectively formed into an inner concave space and an outer concave space, the inner sealing ring 45 is filled in the inner concave space so as to be in press contact with the electrode, and the outer sealing ring 46 is filled in the outer concave space so as to be in press contact with the inner wall surface of the housing i 41.
The sealing cylinder 4 is arranged on the base 2, the shell I41 is a cylinder steel shell made of heat-resistant stainless steel, the A-type pressing block 43 and the B-type pressing block 44 are special-shaped high-temperature-resistant insulating refractory bricks, the matching surfaces of the A-type pressing block 43 and the B-type pressing block 44 are arranged to be concave-convex surfaces, when the multiple layers of the A-type pressing block 43 and the B-type pressing block 44 are nested and combined and stacked together, concave-convex surfaces on the two pressing blocks can be matched to form concave-convex spaces, and the concave-convex spaces can be correspondingly used for placing/filling inner sealing rings and outer sealing rings and can be matched with the inner sealing rings and the outer sealing rings to form a labyrinth structure to serve as a multi-stage sealing surface.
The inner sealing ring 45 and the outer sealing ring 46 are formed by coiling insulating packing with certain flexibility and high temperature resistance on site, the inner sealing ring 45 is directly contacted with the graphite electrode 6 to form a contacted dynamic sealing surface, the outer sealing ring 46 is directly contacted with the inner wall surface of the shell I41, the inner sealing ring 45 and the outer sealing ring 46 can be compressed and deformed by the A-type pressing block 43 and the B-type pressing block 44 under the compression of the elastic compression device 5, and the graphite electrode 6 and the shell I41 are expanded and squeezed in the radial direction of the electrode to realize sealing.
The nitrogen sealing device 42 is an annular pipe made of heat-resistant stainless steel, a nitrogen inlet 421 is arranged outside the annular pipe, and a plurality of air outlet small holes are uniformly distributed on the inner circumference of the annular pipe. After nitrogen is introduced, an air seal can be formed in the local space in the sealing cylinder 4, so that flue gas in the furnace is prevented from overflowing through the gaps.
Referring to fig. 5 to 7, the sealing cylinder 4 is fixed to the base 2 by a clamping buckle 3. The clamping buckles 3 are provided with a plurality of groups and are circumferentially arranged on the upper flange II 211 at intervals around the shell II 21; each clamping buckle 3 comprises a compression bolt 31 and a C-shaped bracket 32, the lower end of the C-shaped bracket 32 is fixedly connected to the upper flange II 211, and the compression bolt 31 penetrates through the upper end of the C-shaped bracket 32 and is propped against the bottom plate 411 of the shell I41. Specifically, the compression bolt 31 passes through the threaded hole of the C-shaped bracket 32 and presses the outer edge of the bottom plate 411, and the compression bolt 31 clamps the base 2 and the sealing cylinder 4 by tightening the compression bolt 31; by loosening the compression bolt 31, the sealing cylinder 4 can move horizontally and integrally with the graphite electrode 6, so that the graphite electrode 6 and the base 2 can be conveniently and centrally adjusted during installation, and meanwhile, the clamping of the clamping buckle 3 is not influenced by the sealing cylinder 4 and the base 2.
In this embodiment, the elastic pressing device 5 has two groups, that is, two pressing plates 51 are respectively disposed on two sides of the graphite electrode 6, two ends of each pressing plate are provided with bolt holes, and the pressing plates are connected and locked with the upper flange I412 through the tension bolts 52 passing through the bolt holes to press the pressing block groups sleeved outside the graphite electrode. The tension bolt 52 presses the combined disc spring 53 to downwards tension the pressing plate 51, and the pressing plate 51 compresses the inner sealing ring 45 and the outer sealing ring 46 through the A-shaped pressing block 43 and the B-shaped pressing block 44; the tightening force of the tightening bolt 52 can be adjusted to adjust the direct compression degree of the inner seal ring 45 and the outer seal ring 46.
In the electrode sealing device, a shell II 21 in a base 2 is fixed with a furnace cover through insulating connection on one hand, and insulation between an upper sealing device and the furnace cover is realized on the other hand; the insulating and heat-resistant electrode hole bricks 22 are arranged in the base 2, so that the isolation of main smoke and heat in a hearth can be realized, and the insulation of the sealing cylinder 4 to the graphite electrode 6 is realized. A type briquetting 43, B type briquetting 44, interior sealing washer 45 and outer sealing washer 46 in the seal tube cooperate a set of labyrinth seal who constitutes, and inboard flexible sealing washer and graphite electrode direct contact are responsible for the dynamic seal of graphite electrode, and outside flexible sealing washer and pinch-off brick (A type briquetting 43, B type briquetting 44) are responsible for the sealed interior space of seal tube, and inside and outside flexible sealing washer and briquetting combination design are multilayer structure, have formed the multistage sealed face that has certain flexibility. The nitrogen seal device 42 creates a gas seal in the partial space within the sealed canister to prevent the fume from escaping up the gap. The sealing cylinder is fixed on the base 2 through the clamping buckle 3, and after the clamping buckle 3 is removed, the sealing cylinder can integrally move along with the electrode, so that the problem that the graphite electrode is difficult to center with an electrode hole of the base below can be solved during installation. The tightness degree of the tension bolt is adjusted, the pressure of the pressing block in the sealing cylinder on the flexible inner sealing ring and the flexible outer sealing ring can be adjusted, and the tightness degree of the sealing ring in contact with the electrode is adjusted, so that the sealing effect is adjusted.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (10)
1. The sealing device for the electric furnace electrode comprises a sealing cylinder arranged above a furnace cover of the electric furnace, wherein the sealing cylinder comprises a shell I, a pressing block group and a nitrogen sealing device; the shell I is of a cylindrical structure, an annular bottom plate is arranged at the lower port of the shell I, an upper flange I extending outwards is arranged at the upper port of the shell I, a plurality of press block groups are stacked above the bottom plate at the inner side of the shell I, and a nitrogen sealing device is arranged between the press block groups; the press block group comprises an A-type press block and a B-type press block which are correspondingly matched, the matching surfaces of the A-type press block and the B-type press block are concave-convex surfaces, and an inner sealing ring and an outer sealing ring are clamped between the matching surfaces; the method is characterized in that: the device also comprises a base and an elastic pressing device;
the base comprises a cylindrical shell II and electrode hole bricks which are annularly arranged at the inner wall of the shell II around the shell II, an upper flange II and a lower flange II which extend outwards are correspondingly arranged at the upper port and the lower port of the shell II, wherein the lower flange II is in insulating connection with an electrode hole flange seat of an electric furnace cover, and the upper flange II is detachably connected with a bottom plate of the shell I through a clamping buckle;
the elastic pressing device comprises a pressing plate, a tension bolt and a combined disc spring, wherein the pressing plate is pressed at the top of the pressing block group and is connected with the upper flange I through the tension bolt, the combined disc spring is sleeved on the tension bolt, and two end faces of the combined disc spring correspondingly prop up between the upper flange I and the head of the tension bolt.
2. The electric furnace electrode sealing device according to claim 1, wherein: the electrode Kong Zhuanxing arranged around the inner wall of the shell II is of a tube structure with an end cover part, wherein the lower end surface of the end cover part arranged corresponding to the shell II is pressed above an electrode hole flange seat of the electric furnace cover, and the tube positioned below the end cover part extends into the electric furnace from a port of the electrode hole flange seat along the axial direction of the electrode; the electrode hole bricks are insulating refractory bricks.
3. The electric furnace electrode sealing device according to claim 2, wherein: the upper end face of the electrode hole brick end cover part is not higher than the upper end face of the upper flange II, and the end head of the electrode hole brick pipe body extending into the electric furnace extends out of the furnace cover refractory material or is flush with the thickness of the furnace cover refractory material; a gap exists between the inner wall surface of the pipe body structure formed by the electrode hole bricks and the electrode.
4. An electric furnace electrode sealing device according to any one of claims 1 to 3, wherein: and a ceramic fiber felt is filled in the gap between the electrode hole brick and the inner wall surface of the shell II.
5. The electric furnace electrode sealing device according to claim 1, wherein: both the A-type pressing block and the B-type pressing block are made of insulating refractory materials.
6. The electric furnace electrode sealing device according to claim 1 or 5, wherein: the A-type pressing block is of a convex structure, the B-type pressing block is of a cross structure, the inner side and the outer side of the A-type pressing block which are stacked with each other correspond to form an inner ring concave space and an outer ring concave space, the inner sealing ring is filled in the inner ring concave space to be matched with the electrode, and the outer sealing ring is filled in the outer ring concave space to be matched with the inner wall surface of the shell I.
7. The electric furnace electrode sealing device according to claim 6, wherein: the inner sealing ring is in extrusion contact with the electrode, and the outer sealing ring is in extrusion contact with the inner wall surface of the shell I.
8. The electric furnace electrode sealing device according to claim 1, wherein: the clamping buckles are provided with a plurality of groups and are circumferentially arranged on the upper flange II at intervals around the shell II; each clamping buckle comprises a compression bolt and a C-shaped bracket, the lower end of the C-shaped bracket is fixedly connected to the upper flange II, and the compression bolt penetrates through the upper end of the C-shaped bracket and is propped against the bottom plate of the shell I.
9. The electric furnace electrode sealing device according to claim 1, wherein: an insulating pad is arranged between the lower flange II of the shell II and the electrode hole flange seat of the electric furnace cover, a bolt connecting hole is correspondingly arranged on the lower flange II and the electrode hole flange seat, the lower flange II and the electrode hole flange seat are connected through a bolt, and an insulating sleeve is arranged in the bolt connecting hole.
10. The electric furnace electrode sealing device according to claim 1, wherein: the nitrogen sealing device is an annular pipe made of heat-resistant stainless steel, a nitrogen inlet is arranged outside the annular pipe, and a plurality of air outlet small holes are uniformly distributed on the inner circumference of the annular pipe.
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| CN112797787B (en) * | 2020-12-30 | 2021-11-23 | 江苏三环奥纳科技有限公司 | Nanocrystalline magnetically soft alloy smelting system |
| CN112760441B (en) * | 2021-01-19 | 2024-07-16 | 西安杰能冶金设备科技有限公司 | Disc spring type pressure ring jacking device |
| CN114744421B (en) * | 2022-06-09 | 2022-08-26 | 中国飞机强度研究所 | Airtight high-temperature high-voltage conductive electrode packaging system for testing thermal strength of aerospace plane |
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