CN111578719A - Electric furnace electrode sealing device - Google Patents
Electric furnace electrode sealing device Download PDFInfo
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- CN111578719A CN111578719A CN202010549811.2A CN202010549811A CN111578719A CN 111578719 A CN111578719 A CN 111578719A CN 202010549811 A CN202010549811 A CN 202010549811A CN 111578719 A CN111578719 A CN 111578719A
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- 238000007789 sealing Methods 0.000 title claims abstract description 126
- 239000011449 brick Substances 0.000 claims abstract description 37
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 34
- 238000009413 insulation Methods 0.000 claims description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 11
- 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
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 2
- 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 7
- 239000002910 solid waste Substances 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 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
- 238000010586 diagram Methods 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
- 238000012423 maintenance Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction 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
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Classifications
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- 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
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- 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
Abstract
The invention relates to an electric furnace electrode sealing device, belonging to the field of electrode configuration. The base is internally provided with an insulating and heat-resistant electrode hole brick, the base is fixed with the furnace cover through insulating connection, an A-type pressing block, a B-type pressing block, an inner sealing ring and an outer sealing ring in the sealing cylinder are matched to form a set of labyrinth sealing device, and the inner flexible sealing ring is in direct contact with the graphite electrode and is responsible for dynamic sealing of the graphite electrode. The sealing cylinder is fixed on the base through the clamping buckle, so that the problem that the graphite electrode and the electrode hole of the lower base are not easy to align during installation can be solved; the elastic pressing device can adjust the pressure of the pressing block in the sealing cylinder on the flexible inner and outer sealing rings, so that the tightness degree of the contact between the sealing rings and the electrodes is adjusted, and the effect of adjusting sealing is achieved. The electrode sealing device has a compact structure, is convenient to adjust and maintain, solves the problem of dynamic sealing of the solid waste recycling electric furnace electrode under high temperature and 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 for a solid waste recycling electric furnace.
Background
The traditional metallurgical electric furnace has low requirement on the tightness of an electrode hole, for example, a steel-making electric arc furnace and a ladle refining furnace are all provided with an integral small refractory furnace cover at the electrode hole of the furnace cover, so that the effects of insulation, heat insulation and splashing prevention of an electrode are achieved, and the electrode hole can be collided with the small refractory furnace cover for preventing the electrode from moving and still leave a large gap.
The traditional iron alloy ore thermoelectric furnace body is large, the diameter is generally over phi 700mm when the diameter of the used electrode is a graphite electrode, and the diameter can reach phi 2000mm when a self-baking electrode is used, so that the appearance of various electrode sealing devices of the electric furnace is also large; in addition, the internal structure of the electrode sealing device of the submerged arc furnace is complex, the electrode sealing device is mostly composed of a water cooling sleeve, a refractory brick, a nitrogen seal, a compression spring and the like, although the sealing device can play a role in insulation and heat insulation, the sealing device has the problems of large external shape and heavy weight, the sealing device (the follow-up electrode) is poor in follow-up property and the compression effect of the compression spring is not ideal, in general, gaps can appear on the sealing surface of an electrode hole for a long time when the electrode moves, smoke leakage is generated, and most of the submerged arc furnaces work in a semi-closed state at present. The solid waste recycling electric furnace is relatively small, so that the traditional ferroalloy ore-smelting electric furnace electrode sealing device is not applicable by directly using or reducing the proportion.
Compared with the traditional metallurgical electric furnace, the solid-waste electric furnace has small body type relativity, the graphite electrode with the diameter of less than 300mm is adopted as the electrode, the processing objects are solid waste and dangerous waste products, the requirement on the tightness of the furnace is high, and the traditional electrode sealing device can not meet the requirement, so that a novel electrode sealing device is needed to solve the problem of follow-up sealing of the middle and small diameter electrode under high temperature and electrification.
Disclosure of Invention
In view of the above, the present invention provides an electric furnace electrode sealing device to solve the problem of follow-up sealing of medium and small diameter electrodes under high temperature and electrification.
In order to achieve the purpose, the invention provides the following technical scheme:
an electric furnace electrode sealing device comprises a sealing cylinder arranged above a furnace cover of an electric furnace, wherein the sealing cylinder mainly 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 pressing block groups are stacked above the bottom plate on the inner side of the shell I, and a nitrogen sealing device is arranged between the pressing block groups; the pressing block group comprises an A-type pressing block and a B-type pressing block which are correspondingly matched, 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 mainly comprises II and the electrode hole brick of establishing in II inner walls departments of casing around II rings of casing of cylindric casing, and the last port of casing II corresponds with lower port department and is equipped with II and the lower flange II of the upper flange that outwards extends, and wherein the electrode hole flange seat insulating connection of lower flange II and electric stove bell, and the upper flange II can be dismantled with the bottom plate of casing I through pressing from both sides tight buckle and be connected.
The elastic pressing device comprises a pressing plate, a tension bolt and a combined disc spring, 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 are correspondingly propped between the upper flange I and the head of the tension bolt.
Further, an electrode hole brick arranged around the inner wall of the shell II forms a pipe body structure with an end cover part, wherein the lower end face of the end cover part correspondingly arranged with the shell II is pressed above an electrode hole flange seat of an electric furnace cover, and a pipe body positioned below the end cover part extends into the electric furnace from an electrode hole flange seat port along the axial direction of the electrode; the electrode hole brick is an insulating refractory brick.
Furthermore, the upper end surface of the end cover part of the electrode hole brick is not higher than the upper end surface of the upper flange II, and the end of the electrode hole brick 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 is reserved between the inner wall surface of the tube body structure formed by the electrode hole bricks and the electrodes.
Further, a gap between the electrode hole brick and the inner wall surface of the shell II is filled with ceramic fiber felt.
Further, the A-type pressing block and the B-type pressing block are both made of insulating refractory materials.
Furthermore, the A-type pressing block is of a convex structure, the B-type pressing block is of a cross structure, the A-type pressing block and the B-type pressing block which are stacked mutually 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.
Furthermore, a plurality of groups of clamping buckles are arranged on the upper flange II at intervals in the circumferential direction around the shell II; each clamping buckle mainly 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 pressed on 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, bolt connecting holes are correspondingly formed in the lower flange II and the electrode hole flange seat and are connected through bolts, and insulating sleeves are arranged in the bolt connecting holes.
Furthermore, the nitrogen sealing device is a ring-shaped pipe made of heat-resistant stainless steel, a nitrogen gas inlet is formed outside the ring-shaped pipe, and a plurality of small air outlet holes are uniformly distributed on the inner circumference of the ring-shaped pipe.
The invention has the beneficial effects that:
(1) the base is fixed with the furnace cover through insulation connection, and the other side realizes insulation between the upper sealing cylinder and the furnace cover; the base is internally provided with insulating and heat-resistant electrode hole bricks, 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 is realized.
(2) A type briquetting, B type briquetting, inner seal circle and the outer seal circle in the sealed section of thick bamboo cooperate and form a set of labyrinth sealing device, inboard flexible seal circle and graphite electrode direct contact are responsible for the movive seal of graphite electrode, and outside flexible seal circle and compress tightly the sealed of brick (A type briquetting, B type briquetting) responsible for sealed section of thick bamboo inner space, and the flexible seal circle and the briquetting integrated design in inside and outside are multilayer structure, have formed the multistage sealed face that has certain flexibility.
(3) The nitrogen sealing device generates gas seal in the local space in the sealing cylinder, and can prevent the smoke in the furnace from overflowing along the gap.
(4) The sealing cylinder is fixed on the base through the clamping buckle, and after the clamping buckle is disassembled, the sealing cylinder can move integrally along with the electrode, so that the problem that the graphite electrode and the electrode hole of the lower base are not easy to align when the sealing cylinder is installed can be solved.
(5) The tightness degree of the tension bolt is adjusted, the pressure of the press block in the sealing cylinder on the flexible inner and outer sealing rings can be adjusted, the tightness degree of the contact between the sealing rings and the electrodes is further adjusted, and the effect of adjusting sealing is achieved.
In general, the electrode sealing device has compact structure and convenient adjustment and maintenance, solves the problem of dynamic sealing of the solid waste recycling electric furnace electrode under high temperature and electrification, and realizes the 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 objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural view of the electrode sealing device of the electric furnace;
FIG. 2 is a schematic structural diagram of a base;
FIG. 3 is an enlarged view of portion A of FIG. 1;
FIG. 4 is a schematic structural view of a sealing cartridge;
FIG. 5 is a top view of FIG. 1;
FIG. 6 is an enlarged view of portion B of FIG. 1;
fig. 7 is an enlarged view of a portion C of fig. 1.
Reference numerals:
the electrode hole sealing device comprises an electrode hole flange seat 1, a base 2, a clamping buckle 3, a sealing cylinder 4, an elastic pressing device 5, a graphite electrode 6 and a furnace cover refractory material 7;
in the base: the shell II 21, the electrode hole bricks 22, the insulating pad 23, the bolts 24, the insulating sleeve 25, the ceramic fiber felt 26, the upper flange II 211, the lower flange II 212 and the end cover part 221;
in the clamping buckle: a hold-down bolt 31, a C-shaped bracket 32;
in the sealed cylinder: the device comprises a shell I41, a nitrogen sealing device 42, an A-type pressing block 43, a B-type pressing block 44, an inner sealing ring 45, an outer sealing ring 46, a bottom plate 411, an upper flange I412 and a nitrogen inlet 421;
in the elastic pressing device: a pressure plate 51, a tension bolt 52 and a combined disc spring 53.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood 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 numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
As shown in figure 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 mainly comprises a shell I41, a briquetting 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 I, a plurality of pressure block groups are stacked above the bottom plate 411 on the inner side of the shell I41, and the nitrogen sealing device 42 is arranged between the pressure block groups; the pressing block group comprises an A-type pressing block 43 and a B-type pressing block 44 which are correspondingly matched, matching surfaces of the A-type pressing block 43 and the B-type pressing 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 mainly comprises a cylindrical shell II 21 and an electrode hole brick 22 annularly arranged on 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, the lower flange II 212 is in insulated connection with an electrode hole flange seat 1 of an electric furnace cover, and the upper flange II 211 is detachably connected with a 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 presses on the top of the pressing block group 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 heads of the combined disc spring 53 are correspondingly propped between the upper flange I412 and the head of the tension bolt 52.
Specifically, referring to fig. 2, the electrode hole bricks 22 arranged around the inner wall of the casing ii 21 form a tubular structure having an end cap portion 221, wherein the lower end face of the end cap portion 221 arranged corresponding to the casing ii 21 is pressed above the electrode hole flange seat 1 of the electric furnace lid, and the tubular portion below the end cap portion 221 extends from the end of the electrode hole flange seat 1 to the inside of the electric furnace along the axial direction of the electrode; the electrode hole bricks 22 are insulating refractory bricks.
The upper end face of the end cover portion 221 in the electrode hole brick 22 is not higher than the upper end face of the upper flange ii 211, and is preferably arranged in a flush manner, so that a tight fit with the bottom plate 411 in the housing i 41 is achieved. The end of the electrode hole brick tube body extending into the electric furnace can extend out of the furnace cover refractory material 7 or is flush with the thickness of the furnace cover refractory material 7, namely, the lowest end tube opening of the electrode hole brick tube body should exceed the inner surface of the furnace cover refractory material 7 or be flush with the inner surface. The tube body structure formed by the electrode hole bricks is used for inserting the graphite electrode 6.
In the base 2, a shell II 21 is a copper-shaped steel shell made of heat-resistant stainless steel and is fixed on the electrode hole flange seat 1 through insulation connection; the electrode hole bricks 22 in the shell II 21 are specially-made special-shaped high-temperature-resistant insulating refractory bricks, the electrode hole bricks 22 extending into the furnace are sleeved on the graphite electrode 6 and are pressed on the electrode hole flange seat 1, the electrified graphite electrode 6 and high-temperature smoke in the furnace can be isolated from the outside, and therefore the effects of insulation and heat insulation are achieved. A proper gap is left between the inner wall of the tube 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 of the graphite electrode 6 during working.
The insulation connection in the scheme is realized by the insulation pad 23 and the insulation sleeve 25. Specifically, referring to fig. 3, an insulating pad 23 is arranged between a lower flange ii 212 of the casing ii 21 and the electrode hole flange seat 1 of the electric furnace cover, bolt connecting holes are correspondingly arranged on the lower flange ii 212 and the electrode hole flange seat 1 and are connected through bolts 24, and insulating sleeves 25 are arranged in the bolt connecting holes. 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 bolt is tightened, the upper shells of the base 2, the sealing cylinder 4 and the like are insulated from the electrode hole flange seat 1.
Preferably, a gap between the electrode hole brick 22 and the inner wall surface of the shell II 21 is filled with a ceramic fiber felt 26, and the ceramic fiber felt 26 can prevent smoke from overflowing.
Referring to fig. 4, each of the a-type compact 43 and the B-type compact 44 is made of an insulating refractory material. The a-type pressure block 43 in this embodiment is a torus having a convex cross-section, and the B-type pressure block is also a torus having a cross-section. The inner sides and the outer sides of the A-type pressing block 43 and the B-type pressing block 44 which are stacked mutually correspond to form an inner ring concave space and an outer ring concave space, the inner sealing ring 45 is filled in the inner ring concave space so as to be in pressing contact with the electrode, and the outer sealing ring 46 is filled in the outer ring concave space so as to be in pressing contact with the inner wall surface of the shell I41.
The sealing cylinder 4 is arranged on the base 2, the shell I41 is a cylindrical steel shell made of heat-resistant stainless steel, the A-type pressing block 43 and the B-type pressing block 44 are made of special-shaped high-temperature-resistant insulating refractory bricks, the matching surface of the A-type pressing block 43 and the B-type pressing block 44 is set to be a concave-convex surface, when the multiple layers of A-type pressing blocks 43 and the B-type pressing blocks 44 are nested, combined and stacked together, the concave-convex surfaces on the two pressing blocks can be matched to form a concave-convex space, and the concave-convex space can be used for not only correspondingly placing/filling the inner sealing ring and the outer sealing ring, but also can be matched with the.
The inner sealing ring 45 and the outer sealing ring 46 are both formed by coiling insulating packing on site, the insulating packing is high-temperature resistant and has certain flexibility, the inner sealing ring 45 is in direct contact with the graphite electrode 6 to form a contacted dynamic sealing surface, the outer sealing ring 46 is in direct contact with the inner wall surface of the shell I41, under the compression of the elastic pressing device 5, 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, the graphite electrode 6 and the shell I41 are expanded and tightly squeezed in the radial direction of the electrode, and sealing is achieved.
The nitrogen sealing device 42 is an annular tube made of heat-resistant stainless steel, a nitrogen inlet 421 is arranged outside the annular tube, and a plurality of small air outlet holes are uniformly distributed on the inner circumference of the annular tube. After nitrogen is introduced, a gas seal can be formed in the local space in the sealing cylinder 4, so that the smoke in the furnace is prevented from overflowing through the gap.
Referring to fig. 5 to 7, the sealing cylinder 4 is fixed to the base 2 by a clip 3. The clamping buckles 3 are arranged on the upper flange II 211 at intervals in the circumferential direction around the shell II 21; each clamping buckle 3 mainly 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 pressed against the bottom plate 411 of the shell I41. Specifically, the pressing bolt 31 penetrates through a threaded hole of the C-shaped bracket 32 and is pressed at the outer edge of the bottom plate 411, and the base 2 and the sealing cylinder 4 are tightly clamped by the pressing bolt 31 through screwing the pressing bolt 31; the compression bolt 31 is loosened, the sealing cylinder 4 can horizontally and integrally move along with the graphite electrode 6, so that the centering adjustment of the graphite electrode 6 and the base 2 is facilitated during installation, and meanwhile, the clamping of the clamping buckle 3 is not influenced by the non-centering of the sealing cylinder 4 and the base 2.
In this embodiment, the elastic pressing devices 5 are two sets, that is, a pressing plate 51 is respectively disposed on two sides of the graphite electrode 6, bolt holes are disposed on two ends of each pressing plate, and the pressing plate is connected and locked with the upper flange i 412 through a tensioning bolt 52 passing through the bolt holes to press the pressing plate set sleeved outside the graphite electrode. The tension bolt 52 presses the combined disc spring 53 to tension the pressure plate 51 downwards, and the pressure plate 51 compresses the inner sealing ring 45 and the outer sealing ring 46 through the A-type pressure block 43 and the B-type pressure block 44; adjusting the tension of the tension bolt 52 adjusts the degree of direct compression of the inner seal ring 45 against 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 insulation connection, and the other side realizes insulation between an upper sealing device and the furnace cover; the base 2 is internally provided with insulating and heat-resistant electrode hole bricks 22, 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, inner seal ring 45 and outer seal ring 46 in the sealed cylinder cooperate and form a set of labyrinth sealing device, inboard flexible seal ring and graphite electrode direct contact are responsible for the dynamic seal of graphite electrode, the flexible seal ring in the outside and compress tightly the brick (A type briquetting 43, B type briquetting 44) and are responsible for the sealed of sealed cylinder inner space, the flexible seal ring and the briquetting integrated design in inside and outside are multilayer structure, have formed the multistage sealed face that has certain flexibility. The nitrogen sealing device 42 generates gas seal in the local space in the sealing cylinder, and can prevent the smoke in the furnace from overflowing along the gap. The sealing cylinder is fixed on the base 2 through the clamping buckle 3, and after the clamping buckle 3 is disassembled, the sealing cylinder can move integrally along with the electrode, so that the problem that the graphite electrode and the electrode hole of the lower base are not easy to align when the sealing cylinder is installed can be solved. And the tightness degree of the tension bolt is adjusted, the pressure of a press block in the sealing cylinder on the flexible inner and outer sealing rings can be adjusted, and then the tightness degree of the contact between the sealing rings and the electrodes is adjusted, so that the effect of adjusting the sealing is achieved.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. An electric furnace electrode sealing device comprises a sealing cylinder arranged above a furnace cover of an electric furnace, wherein the sealing cylinder mainly 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 pressing block groups are stacked above the bottom plate on the inner side of the shell I, and a nitrogen sealing device is arranged between the pressing block groups; the pressing block group comprises an A-type pressing block and a B-type pressing block which are correspondingly matched, 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 method is characterized in that: the device also comprises a base and an elastic pressing device;
the base mainly comprises a cylindrical shell II and electrode hole bricks annularly arranged on 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, the lower flange II is in insulation 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, 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 are correspondingly propped 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 hole bricks arranged around the inner wall of the shell II form a pipe body structure with an end cover part, wherein the lower end surface of the end cover part correspondingly arranged with the shell II is pressed above an electrode hole flange seat of an electric furnace cover, and a pipe body positioned below the end cover part extends into the electric furnace from an electrode hole flange seat port along the axial direction of the electrode; the electrode hole brick is an insulating refractory brick.
3. The electric furnace electrode sealing device according to claim 2, wherein: the upper end surface of the electrode hole brick end cover part is not higher than the upper end surface of the upper flange II, and the end of the electrode hole brick tube body extending into the electric furnace extends out of the furnace cover refractory material or is flush with the furnace cover refractory material in thickness; a gap is reserved between the inner wall surface of the tube body structure formed by the electrode hole bricks and the electrodes.
4. The electric furnace electrode sealing device according to any one of claims 1 to 3, characterized in that: and a gap between the electrode hole brick and the inner wall surface of the shell II is filled with ceramic fiber felt.
5. The electric furnace electrode sealing device according to claim 1, wherein: the A-type pressing block and the B-type pressing block are both 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 A-type pressing block and the B-type pressing block which are stacked mutually 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: a plurality of groups of clamping buckles are arranged on the upper flange II at intervals in the circumferential direction around the shell II; each clamping buckle mainly 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 pressed on 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, bolt connecting holes are correspondingly formed in the lower flange II and the electrode hole flange seat and connected through bolts, and insulating sleeves are arranged in the bolt connecting holes.
10. The electric furnace electrode sealing device according to claim 1, wherein: the nitrogen sealing device is a ring-shaped pipe made of heat-resistant stainless steel, a nitrogen gas inlet is arranged outside the ring-shaped pipe, and a plurality of small air outlet holes are uniformly distributed on the inner circumference of the ring-shaped pipe.
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| CN202010549811.2A CN111578719A (en) | 2020-06-16 | 2020-06-16 | Electric furnace electrode sealing device |
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| CN202010549811.2A CN111578719A (en) | 2020-06-16 | 2020-06-16 | Electric furnace electrode sealing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112797787A (en) * | 2020-12-30 | 2021-05-14 | 江苏三环奥纳科技有限公司 | Nanocrystalline magnetically soft alloy smelting system |
| CN114744421A (en) * | 2022-06-09 | 2022-07-12 | 中国飞机强度研究所 | Airtight type high-temperature high-voltage conductive electrode packaging system for testing thermal strength of aerospace plane |
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| CN114744421A (en) * | 2022-06-09 | 2022-07-12 | 中国飞机强度研究所 | Airtight type high-temperature high-voltage conductive electrode packaging system for testing thermal strength of aerospace plane |
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