KR101669403B1 - roof cover improved heat reservance for electric furnace - Google Patents

roof cover improved heat reservance for electric furnace Download PDF

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Publication number
KR101669403B1
KR101669403B1 KR1020160084152A KR20160084152A KR101669403B1 KR 101669403 B1 KR101669403 B1 KR 101669403B1 KR 1020160084152 A KR1020160084152 A KR 1020160084152A KR 20160084152 A KR20160084152 A KR 20160084152A KR 101669403 B1 KR101669403 B1 KR 101669403B1
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KR
South Korea
Prior art keywords
door
roof cover
opening
electric furnace
bobbin
Prior art date
Application number
KR1020160084152A
Other languages
Korean (ko)
Inventor
김현석
김석곤
Original Assignee
주식회사 청우기연
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Priority to KR1020160084152A priority Critical patent/KR101669403B1/en
Application granted granted Critical
Publication of KR101669403B1 publication Critical patent/KR101669403B1/en

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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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1808—Removable covers
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1808—Removable covers
    • F27D1/1816—Removable covers specially adapted for arc furnaces
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1808—Removable covers
    • F27D2001/1825—Means for moving the cover

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

A loop cover for an electric furnace with improved warmth is disclosed.
A roof cover for an electric furnace for opening and closing an opening of an electric furnace loop, the roof cover having an improved warmth, the loop cover including: a roof cover body (110); A first door 120 for opening / closing a ladle entrance 111 provided at one side of the roof cover main body 110; A second door 130 for opening and closing the ingot or strip inlet 112 provided at the other side of the roof cover body 110; A support rod 141 rotatably installed in the electric furnace loop 1a and a connecting rod 142 connected to one side of the roof cover body 110 and passing through the roof cover body 110 on the other side, And a lifting handle 143 for lifting and lowering the connection rod 142 while lifting up the roof cover main body 110 from the electric furnace roof 1a while being installed on the support base 141. [ ); And a first door opening / closing unit 150 for opening and closing the first door 120 in a hinged manner while being supported by the support table 141.

Description

[0001] The present invention relates to a roof cover for an electric furnace,

The present invention relates to a roof cover for an electric furnace for opening and closing a loop of an electric furnace.

In particular, the present invention relates to a loop cover for an electric furnace with improved warmth that can reduce heat loss through a structural improvement that allows the roof cover to partially open.

Generally, an electric furnace is a facility for producing steel by dissolving and refining raw materials such as iron by arc heat generated between an electrode rod and scrap by applying current to a plurality of electrode rods.

In such an electric furnace, a raw material such as scrap is charged through a crane or the like in a state in which a loop covering the top is opened before the scrap is melted, and a high voltage is applied through a plurality of electrodes to dissolve the raw material by high heat arc heat. The molten steel in which the raw materials such as scrap iron are dissolved is moved to the ladle through the ladle formed in the lower part of the electric furnace, and the ladle filled with the molten steel is moved to another process by the carriage provided for traveling.

1 is a sectional view showing an example of a conventional electric furnace. 1, a conventional electric furnace comprises a crucible 2 for dissolving a target metal, a heater 4 made of a silicon carbide (SiC) heating element, and a heat resistant layer 6 including an alumina (Al 2 O 3) And a roof cover 40 for opening and closing the upper end opening of the crucible. The roof cover 40 is made up of a heat insulating layer 8, 18, 28, a guide 30 for covering the open upper end periphery of the crucible,

However, in the above-described conventional electric furnace, when the roof cover 40 is opened, there is a drawback in that heat loss is large because the upper end of the crucible 2 is entirely opened by using the handle 50 type handle.

In other words, the upper opening of the crucible 2 is an inlet and outlet for drawing molten steel, which must be kept open at all times when molten steel is taken out by the ladle, and must also be opened when the ingot or scrap is replenished. However, since the conventional roof cover 40 has a one-piece structure and the entire crucible is opened, the heat inside the crucible is discharged to the outside through the opening, resulting in a disadvantage that heat loss is large.

1. Registration patent publication No. 10-0866464 (Electric furnace and its shaft method) 2. Patent Registration No. 10-1293060 (roof for electric furnace)

The main object of the present invention is to provide a loop cover for an electric furnace with improved warmth that can reduce heat loss through a structural improvement that partially opens the roof cover of the electric furnace.

According to the above object, there is provided a roof cover for an electric furnace for opening and closing an opening of an electric furnace roof, the roof cover comprising: a roof cover main body; A first door for opening / closing a ladle door provided at one side of the roof cover body; A second door for opening and closing the ingot or strip input port provided on the other side of the roof cover body; A connecting rod rotatably installed in the electric furnace main body; a connecting rod having one side connected to the roof cover main body and the other side passing through the roof cover main body; A roof cover main body lifting unit comprising a lifting handle for lifting the roof cover main body from the main body; And a first door opening / closing unit for opening and closing the first door in a hinged manner while being supported by the support.

Preferably, the first door opening / closing unit includes: a bracket provided on the support; A wire guide roller provided at an upper end of the bracket; A wire bobbin supported between the bobbin support plates provided on both sides of the bracket so as to be able to rotate forward and backward; A handle member disposed outside the one bobbin support plate and coupled to one end of the wire bobbin to rotate the bobbin support plate; And a wire connected to the wire bobbin with one end connected to the end of the first door and the other end connected to the wire bobbin while the intermediate portion is guided by the wire guide roller, The first door can be opened or closed as the wire is wound or unwound on the wire bobbin.

Preferably, the handle member includes: a handle body coupled to the wire bobbin; The bobbin support plate according to claim 1, wherein the bobbin support plate includes: a bobbin support plate having a first end and a second end, The tip of the fixing pin can be drawn in and the handle member can be fixed.

Preferably, the first door and the second door are made of a metal skin constituting a surface and a refractory provided on the inner surface of the metal skin, wherein the refractory is formed by a ceramic fiber layer and a castable layer in a ratio of 2: 3 . ≪ / RTI >

The present invention provides a loop cover for an electric furnace with improved warmth that can reduce heat loss through structural improvement to partially open the loop of an electric furnace.

Further, the refractory of the first and second doors is constituted by laminating a ceramic fiber and a lightweight castable, thereby providing a roof cover for an electric furnace with improved heat insulation that can maintain high thermal insulation while reducing weight.

1 is a sectional view showing an example of a conventional electric furnace
Fig. 2 is a perspective view of an electric furnace to which the roof cover according to the present invention is applied
Fig. 3 is a cross-sectional view taken along the line A in Fig.
4 is a detailed perspective view and operating state diagram of the first door opening / closing unit according to the present invention.
5 is a perspective view showing the opened state of the first and second doors,
6 is a cross-sectional view of the first door and the second door

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The terms used in the present invention are defined in consideration of the functions of the present invention and may vary depending on the intention or custom of the user or the operator. Therefore, the definitions of these terms are meant to be in accordance with the technical aspects of the present invention As well as the other.

In addition, optional terms in the following embodiments are used to distinguish one element from another element, and the element is not limited by the terms. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

FIG. 2 is a perspective view of an electric furnace to which a roof cover according to the present invention is applied, FIG. 3 is a view of FIG. 2 viewed from direction A, FIG. 4 is a detailed perspective view and operation state view of a first door opening / 5 is a perspective view showing an opened state of the first and second doors, and Fig. 6 is a sectional view of the first door and the second door.

2 and 3, the roof cover 100 for an electric furnace with improved warmth according to the present invention is for opening and closing the opening 1b of the electric furnace roof 1a, (Not shown) of molten steel in the furnace 1 or to open the opening when the ingot or strip is replenished.

However, if the entire opening is adversely affected, the performance characteristics of the molten steel are adversely affected. Therefore, it is desirable to partially open the opening. The present invention improves the structure of the roof cover 100 in order to realize this point.

Specifically, the roof cover 100 of the present invention includes a roof cover body 110, a first door 120, a second door 130, a roof cover body lift unit 140, and a first door opening / closing unit 150 ).

The roof cover main body 110 is a disk-shaped structure for selectively opening and closing an opening 1b formed at the center of the loop 1a constituting the upper portion of the electric furnace 1 and covered on the opening portion .

The first door 120 is for opening and closing a ladle entrance 111 provided at one side of the roof cover body 110. The ladle entrance 111 is an opening used when the melted molten steel in the electric furnace 1 is taken out by the ladle and must be kept open at all times during the drawing operation of the molten steel.

In the present invention, unlike the conventional fully open type, only the ladle outlet 111 corresponding to a part of the roof cover body 110 is opened, so that the temperature loss of the inside of the electric furnace 1 from the outside can be minimized.

The second door 130 is fixed to the other end of the roof cover main body 110 by an ingot provided on the other side of the roof cover main body 110 so as to be suitable for machining or redissolution such as rolling, Or a strip inlet 112 for opening and closing the metal strip. The ingot or strip inlet 112 is an opening used for replenishing the ingot or strip into the electric furnace 1 and must be opened when the ingot or strip is replenished.

In the present invention, unlike the conventional open type, only the ingot or strip entrance 112 corresponding to a part of the roof cover main body 110 is opened, thereby minimizing the temperature loss of the inside of the electric furnace.

Although the second door 130 is manually opened and closed by a handle in the drawing, the second door 130 may be automatically opened and closed by a cylinder, a motor, a gear, or the like. However, since the temperature of the electric furnace is high, it is necessary to take measures to withstand the high temperature environment of the automatic switchgear.

The roof cover main body lifting unit 140 opens the entire loop cover main body 110 away from the opening 1b of the loop 1a and is rotatably installed in the electric furnace loop 1a. A connecting rod 142 having one end connected to the roof cover main body 110 and the other end passing through the supporting rod 141 and a connecting rod 142 disposed on the supporting rod 141, And a lift handle 143 for raising and lowering the other end to raise and lower the rope cover body 110 from the electric furnace loop 1a.

Here, the support base 141 has an approximately a (base station) shape including a vertical portion and a horizontal portion, and the support portion 141 is rotated by an external force while a vertical portion is fitted on the support provided on the loop 1a. The horizontal portion has a length extending from the strut to the central portion of the upper surface of the roof cover body 110.

When the lifting handle 143 is lowered from the horizontal portion of the supporting table 141 in a levering manner, the connecting rod 142 connected to the lifting handle 143 is lifted and the connecting rod 142 is lifted, As a result, the entire rope cover body 110 connected thereto is lifted. Then, when the support base 141 is rotated, the rope cover body 110 is released from the opening of the loop 1a, so that the opening is completely opened.

The first door opening and closing unit 150 serves to open and close the first door 120 while being supported by the horizontal portion of the support base 141. The bracket A wire guide roller 153 provided at an upper end of the bracket 151 and a bobbin support plate 152 provided at both sides of the bracket 151. The wire bobbin 151 A handle member 155 disposed on the outer side of the one bobbin support plate for rotating the wire bobbin 154 while being coupled with one end of the wire bobbin 154, And a wire 156 connected to the distal end of the first door 120 at one end and to the wire bobbin 154 at the other end.

Both ends of the wire bobbin 156 are coupled to the bobbin support plate 152 through a bearing block 157 so that both ends of the wire bobbin 156 can rotate forward and reverse, And is fixed through the formed wire fixing hole.

The bobbin support plate 152 may have an axial groove 152a formed at one side thereof to facilitate attachment and detachment of the wire bobbin 156. [ This axial groove 152a takes the form of a long hole so that the positional displacement of the wire bobbin 154 is also possible.

The handle member 155 which is a component of the first door opening and closing unit 150 includes a handle body 155a coupled to the wire bobbin 156 and a handle body 155b at the end of the handle body 155a. And a fixing pin 155b which is installed to penetrate in the direction of the bobbin supporting plate 152 and is movable toward the bobbin supporting plate 152. [

A plurality of pin grooves 152b are formed on the surface of the secured support plate 152 along the rotation radius of the fixing pin 155b so that the tip of the fixing pin 155b is inserted into any one of the pin grooves 152b. So that the handle member 155 is fixed. As a result, the opening angle of the first door 120 can be freely adjusted.

6, the first door 120 and the second door 130 are provided with metal skins 121 and 131 constituting the surface and refractories 122 and 132 provided on the inner surfaces of the metal skins 121 and 131 , And the refractory layers 122 and 132 are preferably formed by laminating the ceramic fiber layers 122a and 132a and the light weight castable layers 122b and 132b at a thickness ratio of 2: 3.

Since the refractory 122 is composed of two layers, an air layer is included between the two layers, so that the heat insulating property is excellent and the ceramic fiber layers 122a and 132a and the light weight castable layers 122b and 132b have weight The first and second doors 120 and 130 can be easily opened and closed.

A description 160 is a temperature sensor for measuring the temperature inside the electric furnace.

On the other hand, the connection rod 142 may be coated with a wear-resistant coating layer.

This abrasion-proof coating layer is formed by spraying a powder composed of 96 to 98% by weight of chromium oxide (Cr 2 O 3 ) and 2 to 4% by weight of titanium dioxide (TiO 2 ) And a hardness of 900 to 1000 HV.

The reason why ceramic is applied to the outer circumferential surface of the connection rod 142 is to prevent abrasion and corrosion. Compared to chrome plating or nickel chrome plating, the ceramic coating has excellent corrosion resistance, scratch resistance, abrasion resistance, impact resistance and durability.

Chromium oxide (Cr 2 O 3 ) acts as a passivity layer to block oxygen entering the inside of the metal, thereby preventing rusting.

Titanium dioxide (TiO 2 ) is a white pigment because it is very stable physicochemically and has high hiding power. And is also widely used for ceramics having high refractive index because of high refractive index. And has characteristics of photocatalytic property and superhydrophilic property. Titanium dioxide (TiO 2 ) acts as an air purification function, an antibacterial function, a harmful substance decomposition function, a pollution prevention function, and a discoloration prevention function. This titanium dioxide (TiO 2 ) ensures that the wear-resistant coating layer is coated on the outer circumferential surface of the connection rod 142 and dissolves and removes foreign matter adhering to the wear-resistant coating layer to prevent damage to the wear-resistant coating layer .

Here, chromium oxide (Cr 2 O 3) and when using hayeoseo mixing titanium dioxide (TiO 2), the mixing ratio of these, chrome oxide (Cr 2 O 3) Titanium dioxide (TiO 2) in 96-98% by weight 2 By weight to 4% by weight.

When the mixing ratio of chromium oxide (Cr 2 O 3 ) is less than 96 to 98%, the coating of chromium oxide (Cr 2 O 3 ) is often broken in an environment such as high temperature, ) Of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the inner circumferential surface of the outer circumferential surface of the outer circumferential surface

When the mixing ratio of titanium dioxide (TiO 2 ) is less than 2 to 4 wt%, the effect of titanium dioxide (TiO 2 ) is insignificant so that the purpose of mixing it with chromium oxide (Cr 2 O 3 ) is discolored. That is, titanium dioxide (TiO 2 ) dissolves and removes foreign matter adhered to the outer circumferential surface of the connecting rod 142 to prevent the outer circumferential surface of the connecting rod 142 from being corroded or damaged. The mixing ratio thereof is 2 to 4 weight %, There is a problem that it takes much time to decompose the attached foreign matter.

A coating layer made of such materials is applied to the periphery of the AAAAAA to a thickness of 50 to 600 mu m, to a hardness of 900 to 1000 HV, and to a surface roughness of 0.1 to 0.3 mu m.

The abrasion-proof coating layer is sprayed with the powder powder and the gas at 1400 DEG C at a Mach 2 speed around the outer circumferential surface of the AAAAAA at a speed of 50 to 600 mu m.

When the thickness of the anti-wear coating layer is less than 50 탆, the above-described effect of the ceramic coating layer can not be guaranteed. When the thickness of the anti-wear coating layer exceeds 600 탆, There is a problem that working time and material cost are wasted by application.

The temperature of the outer circumferential surface of the connecting rod 142 is increased while the wear prevention coating layer is applied to the outer circumferential surface of the connecting rod 142. The outer circumferential surface of the connecting rod 142 (Not shown) so as to maintain a temperature of 150 to 200 ° C.

A sealing material made of anhydrous chromic acid (CrO 3 ) made of a metal-based glass quartz system may further be applied to the periphery of the anti-wear coating layer. Anhydrous chromic acid is applied as an inorganic sealing material around the coating layer made of chromium nickel powder.

Anhydrous chromic acid (CrO 3 ) is used in places that require high abrasion resistance, lubricity, heat resistance, corrosion resistance and releasability, is not discolored in the atmosphere, has high durability, and has good abrasion resistance and corrosion resistance. The coating thickness of the sealing material is preferably about 0.3 to 0.5 mu m. If the coating thickness of the sealing material is less than 0.3 mu m, the sealing material easily peels off even in a slight scratch groove, and the above-mentioned effect can not be obtained. When the coating thickness of the sealing material is made thick enough to exceed 0.5 mu m, pin holes, cracks, and the like are increased on the plated surface. Therefore, the coating thickness of the sealing material is preferably about 0.3 to 0.5 mu m.

Therefore, since the coating layer having excellent abrasion resistance and oxidation resistance is formed around the outer circumferential surface of the connecting rod 142, the outer circumferential surface of the connecting rod 142 is prevented from being worn or oxidized, thereby extending the service life of the product.

Further, the support base 141 may be made of FCD cast iron.

This FCD cast iron is heated to 1600 to 1650 ° C to be molten, then subjected to a desulfurization treatment, to a spheroidizing treatment agent containing about 0.3 to 0.7% by weight of magnesium, to a spheroidizing treatment at 1500 to 1550 ° C, and then to heat treatment.

Since FCD cast iron is a cast iron in which graphite is spherically crystallized during the solidification process by adding magnesium or the like to the molten metal of general gray cast iron, the shape of graphite is spherical compared to gray cast iron. Since such FCD cast iron has less notch effect, stress concentration phenomenon is reduced, and strength and toughness are greatly improved.

In the support 141 of the present invention, the FCD cast iron is heated to 1600 to 1650 占 폚 to be molten, then subjected to a desulfurization treatment, and a spheroidizing treatment agent containing about 0.3 to 0.7% by weight of magnesium is put therein and subjected to spheroidizing treatment at 1500 to 1,550 占 폚 Followed by post-heat treatment.

Here, if the FCD cast iron is heated to less than 1600 DEG C, the entire structure can not be sufficiently melted, and if it is heated above 1650 DEG C, unnecessary energy is wasted. Therefore, it is preferable to heat the FCD cast iron to 1600 to 1650 캜.

If the amount of magnesium is less than 0.3% by weight, the effect of injecting the spheroidizing agent is negligible. If the amount of magnesium is more than 0.7% by weight, the effect of injecting spheroidizing agent There is a problem that an expensive material cost is increased while not greatly improving. Therefore, the mixing ratio of magnesium in the spheroidizing agent is preferably about 0.3 to 0.7% by weight.

When the spheroidizing treatment agent is injected into the molten FCD cast iron, it is subjected to spheroidizing treatment at 1500~1550 ° C. If the spheroidizing treatment temperature is lower than 1500 ° C., the spheroidizing treatment is not properly performed. If the spheroidizing treatment temperature is higher than 1550 ° C., the spheroidizing treatment effect is not greatly improved, but unnecessary energy is wasted. Therefore, the spheroidization treatment temperature is preferably 1500 to 1550 ° C.

Since the support 141 of the present invention is made of the FCD cast iron, the notch effect is small, so that the stress concentration phenomenon is reduced, and the strength and toughness are greatly improved.

The discoloring portion can be coated on the outer surface of the first door 120. This discoloring portion is applied to the surface of the first door 120 with two or more color change materials whose color changes when the temperature becomes a predetermined temperature or more and is separated into two or more sections according to the temperature change, And a protective film layer is applied on the discolored portion to prevent the discolored portion from being damaged.

Here, the discoloring portion may be formed by applying a temperature discoloring material having a discoloration temperature of not less than 40 DEG C and not less than 60 DEG C, respectively. The discoloring portion is for detecting a change in temperature of the paint by changing color according to the temperature of the first door 120.

The discoloring unit may be formed by applying a coloring material having a color change to a surface of the first door 120 when the temperature of the discoloring unit is higher than a predetermined temperature. In addition, the temperature discoloring substance is generally composed of a microcapsule structure having a size of 1 to 10 탆, and the microcapsules can exhibit a colored and transparent color due to the bonding and separation phenomenon depending on the temperature of the electron donor and the electron acceptor.

In addition, the temperature-changing materials can change color quickly and have various coloring temperatures such as 40 ° C, 60 ° C, 70 ° C, and 80 ° C, and such coloring temperature can be easily adjusted by various methods. Such a temperature-coloring material may be various kinds of temperature-coloring materials based on principles such as molecular rearrangement of an organic compound and spatial rearrangement of an atomic group.

For this purpose, it is preferable that the discoloring unit is formed so as to be divided into two or more sections according to the temperature change by applying two or more temperature-coloring materials having different discoloration temperatures. The temperature-coloring layer preferably uses a temperature-coloring material having a relatively low temperature of the discoloration temperature and a temperature-discoloring material having a relatively high discoloration temperature, more preferably a discoloration temperature of not lower than 40 ° C and not lower than 60 ° C A color change portion can be formed by using a temperature coloring material.

Accordingly, the temperature change of the first door 120 can be checked step by step, thereby detecting the temperature change of the paint. Accordingly, the first door 120 can be operated in an optimum state, 1 door 120 can be prevented from being damaged in advance.

In addition, the protective film layer is coated on the discolored portion, thereby preventing the discolored portion from being damaged due to external impact, easily recognizing discoloration of the discolored portion, and considering the weakness of the temperature discolored material, Is preferably used.

The periphery of the roof cover body 110 can be coated with a polypropylene resin composition having excellent impact resistance against external impact or external environment. The polypropylene resin composition comprises a polypropylene random block copolymer composed of 75 to 95% by weight of an ethylene-propylene-alphaolefin random copolymer and 5 to 25% by weight of an ethylene-propylene block copolymer having an ethylene content of 20 to 50% by weight .

The polypropylene random block copolymer is preferably 75 to 95% by weight of the ethylene-propylene-alphaolefin random copolymer and 5 to 25% by weight of the ethylene-propylene block copolymer. The ethylene- When the content of the ethylene-propylene block copolymer is less than 5% by weight, the impact resistance is deteriorated. When the content of the ethylene-propylene block copolymer is more than 25% by weight, the rigidity is deteriorated do. Wherein the ethylene-propylene-alpha olefin random copolymer comprises 0.5 to 7% by weight of ethylene and 1 to 15% by weight of an alpha-olefin having 4 to 5 carbon atoms and improves mechanical stiffness and heat resistance of the polypropylene resin composition, As shown in Fig. The ethylene content is preferably from 0.5 to 5% by weight, more preferably from 1 to 3% by weight. When the content of ethylene is less than 0.5% by weight, the whitening resistance is deteriorated. When the content is more than 7% by weight, . Further, the alpha olefin means any alpha olefin except ethylene and propylene, and is preferably butene.

When the number of carbon atoms is less than 4 or more than 5, the reactivity of the alpha-olefin with the comonomer is low during the production of the random copolymer, making it difficult to produce the copolymer. Further, it may contain 1 to 15% by weight, preferably 1 to 10% by weight, and more preferably 3 to 9% by weight of the above-mentioned alpha olefin. If the amount of the alpha-olefin is less than 1% by weight, the crystallinity becomes higher than necessary and the transparency is lowered. When the amount of the alpha-olefin is more than 15% by weight, the crystallinity and rigidity are lowered and the heat resistance is significantly lowered.

In addition, the ethylene-propylene block copolymer contains 20 to 50% by weight of ethylene and imparts impact resistance to the polypropylene resin composition and enables finely dispersing, thereby imparting both whitening resistance and transparency. The ethylene content may preferably be 20 to 40% by weight, and if it is less than 20% by weight, the impact resistance is deteriorated. If it exceeds 50% by weight, the impact resistance and whitening resistance may be deteriorated.

In addition, a coating layer containing a silicon component may be formed on the surface of the temperature sensor 160 in order to solve the problem of contamination of the surface, which causes the temperature sensor 160 to come out and shorten its service life. The coating layer prevents the adhesion of microorganisms and floating matters, thereby preventing the outflow of the microparticles and suspending the microparticles, and suspending the use of the temperature sensor 160 semi-permanently.

A brief description will be given of a method for preparing the coating liquid. First, dimethyldichlorosilane solution is dissolved in ethyl acetate at a volume ratio of 2-5% to prepare a coating liquid. At this time, if the content of the dimethyldichlorosilane solution is less than 2%, the coating effect can not be sufficiently obtained. If the content exceeds 5%, the coating layer becomes too thick and the efficiency drops. It is preferable that the viscosity of the solution is in the range of 0.8-2 cp (centipoise) in consideration of the application time and the coating thickness. This is because if the viscosity is too low, the application time must be long. If the viscosity is too high, the application may become thick and dry, and uneven application may cause the temperature sensor 160 to be out of order.

In the present invention, the surface of the temperature sensor 160 is coated with a coating solution prepared as described above to a thickness of 1 m or less. At this time, if the thickness of the coating layer exceeds 1 탆, the sensitivity of the temperature sensor 160 is lowered. Therefore, in the present invention, the thickness of the coating layer is limited to 1 탆 or less. In addition, as a method of applying the thickness as described above, a spray method of spraying the surface of the temperature sensor 160 about two or three times may be used.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

100: Loop cover 110: Loop cover body
120: first door 130: second door
140: roof cover body lift unit 150: first door opening / closing unit
160: Temperature sensor

Claims (4)

A loop cover (100) for an electric furnace for opening and closing an opening of an electric furnace loop,
The roof cover (100)
A roof cover body 110;
A first door 120 for opening / closing a ladle entrance 111 provided at one side of the roof cover main body 110;
A second door 130 for opening and closing the ingot or strip inlet 112 provided at the other side of the roof cover body 110;
A support rod 141 rotatably installed in the electric furnace loop 1a and a connecting rod 142 connected to one side of the roof cover body 110 and passing through the roof cover body 110 on the other side, And a lifting handle 143 for lifting and lowering the connection rod 142 while lifting up the roof cover main body 110 from the electric furnace roof 1a while being installed on the support base 141. [ ); And
And a first door opening / closing unit (150) for opening and closing the first door (120) in a hinged manner while being supported by the support base (141);
The first door opening / closing unit (150)
A bracket 151 provided on the support 141;
A wire guide roller 153 provided at an upper end of the bracket 151;
A wire bobbin 154 supported between the bobbin support plates 152 provided on both sides of the bracket 151 so as to be able to rotate forward and backward;
A handle member (155) disposed on the outside of the one bobbin support plate and rotating the bobbin support plate (152) while being coupled with one end of the wire bobbin (154); And
And a wire 156 having one end connected to the distal end of the first door 120 and the other end connected to the wire bobbin 154 while the intermediate portion is guided by the wire guide roller 153,
The first door 120 is opened and closed as the wire 156 is wound on or unwound from the wire bobbin 154 as the wire bobbin 154 is rotated by the handle member 155, cover.
delete The method according to claim 1,
The handle member (155)
A handle body 155a coupled with the wire bobbin 154;
And a fixing pin 155b which is provided at a distal end of the handle body 155a so as to penetrate the handle body in a thickness direction thereof and is movable toward the bobbin holding plate 152,
A loop cover for an electric furnace with improved warmth keeping the front end of the fixing pin 155b inserted into at least one of at least one pin groove 152b formed on a surface of the bobbin support plate 152 to fix the handle member 155, .
delete
KR1020160084152A 2016-07-04 2016-07-04 roof cover improved heat reservance for electric furnace KR101669403B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107421333A (en) * 2017-08-26 2017-12-01 芜湖鼎瀚再制造技术有限公司 A kind of metal melting bell
KR101863535B1 (en) * 2018-03-05 2018-06-29 김현석 Energy saving aluminum warming furnace
KR102118563B1 (en) * 2020-03-04 2020-06-08 주식회사 월드캐스트 Electric melting furnace thermal cover
CN112707637A (en) * 2020-12-09 2021-04-27 江苏永鼎股份有限公司 Device for preventing misoperation of optical rod sintering furnace

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100771933B1 (en) * 2006-06-30 2007-10-31 주식회사환경과생명 Electric heater panel assembly equiped eletric aluminum melting and holding furnace
KR100866464B1 (en) 2006-11-23 2008-10-31 이춘홍 The axial road method besides to an electricity resist crucible
KR101293060B1 (en) 2011-03-30 2013-08-05 현대제철 주식회사 Roof for electric furnace
KR20160063835A (en) * 2014-11-27 2016-06-07 강상열 Cover apparatus for a melt metallurgic furnace

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100771933B1 (en) * 2006-06-30 2007-10-31 주식회사환경과생명 Electric heater panel assembly equiped eletric aluminum melting and holding furnace
KR100866464B1 (en) 2006-11-23 2008-10-31 이춘홍 The axial road method besides to an electricity resist crucible
KR101293060B1 (en) 2011-03-30 2013-08-05 현대제철 주식회사 Roof for electric furnace
KR20160063835A (en) * 2014-11-27 2016-06-07 강상열 Cover apparatus for a melt metallurgic furnace

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107421333A (en) * 2017-08-26 2017-12-01 芜湖鼎瀚再制造技术有限公司 A kind of metal melting bell
CN107421333B (en) * 2017-08-26 2019-07-16 芜湖鼎瀚再制造技术有限公司 A kind of metal melting bell
KR101863535B1 (en) * 2018-03-05 2018-06-29 김현석 Energy saving aluminum warming furnace
KR102118563B1 (en) * 2020-03-04 2020-06-08 주식회사 월드캐스트 Electric melting furnace thermal cover
CN112707637A (en) * 2020-12-09 2021-04-27 江苏永鼎股份有限公司 Device for preventing misoperation of optical rod sintering furnace

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