KR101365520B1 - Heat-treatment apparatus of grain-oriented electrical sheets - Google Patents

Abstract

The heat treatment apparatus of the directional electrical steel sheet for uniformly heating the upper and lower parts of the coil is introduced.
The heat treatment apparatus includes a base plate on which a coil is placed, an inner cover having a lower edge portion coupled to an edge portion of the base plate to surround the coil, a support unit for supporting a lower portion of the base plate, and a base plate for directly heating the base plate. And a main burner installed on the inner wall of the annealing furnace for heating the inner cover from the outside.

Description

HEAT-TREATMENT APPARATUS OF GRAIN-ORIENTED ELECTRICAL SHEETS [0002]

The present invention relates to a heat treatment apparatus for a grain-oriented electrical steel sheet, and more particularly, to a heat treatment apparatus for a grain-oriented electrical steel sheet to install a sub-burner in the lower portion of the base plate to directly heat the coil through the base plate.

In general, the grain-oriented electrical steel sheet undergoes the first annealing of hot rolled, cold rolled and decarburized annealing, and then applies an annealing separator to the surface of the steel sheet and performs the second high temperature annealing. It is carried out by an indirect annealing method which is not applied directly to this electrical steel sheet.

As a technique related to annealing work of a directional electric steel sheet, refer to "a method and apparatus for preventing deformation of a coil edge in annealing of a directional electric steel sheet coil" (Patent Laid-Open Publication No. 10-1999-0042919).

In this technique, in order to prevent deformation occurring at the edge portion of the coil during the high temperature annealing treatment, a configuration in which a coil settlement portion for elastically supporting the coil is provided on the upper surface of the base is introduced.

In addition, as shown in FIG. 1, in another conventional continuous open frame furnace (COF) process, the heat treatment apparatus includes a circular plate 10 on which a coil 50 is placed, and a refractory, and sags of the circular plate 10. The upper support 20 which prevents the phenomenon, the lower support 30 radially disposed below the upper support 20, these circular plates 10, the burner combustion atmosphere which is an external atmosphere gas, and the hydrogen atmosphere gas which is an internal atmosphere gas In order to block direct contact therebetween, the upper support 20 and the lower support 30 are covered with a cover 40 fixed to the sand 61 of the bottom 60.

However, in the prior art, when the cover is heated by radiant heat transfer by an external heating source or cooled by convective heat transfer by an external cooling source, the heat is transferred to a coil inside the cover, where the upper portion of the coil is The heat is cooled and cooled due to the radiant heat, but since the lower part of the coil is heated and cooled through the circular plate heated and cooled by the radiant heat of the cover, a thermal temperature difference occurs in the upper and lower parts of the coil, which is the coil temperature difference. It caused a temperature deviation between the top and bottom of the, and eventually caused a problem that the magnetic quality deviation in the coil is greatly increased.

An object of the present invention for solving this problem is to provide a heat treatment apparatus for a grain-oriented electrical steel sheet so that the upper and lower portions of the coil are uniformly heated.

In order to achieve the above object, the present invention is a heat treatment apparatus for directional electrical steel sheet for uniformly heating the upper and lower parts of the coil, and includes a base plate, an inner cover, a support unit, a sub burner and a main burner. At this time, the coil is placed on the base plate, the inner cover is coupled to the lower edge portion of the base plate to surround the coil, the support unit supports the lower portion of the base plate, the sub-burner is the base plate It is installed in the support unit for direct heating, the main burner is installed on the inner wall of the annealing furnace to heat the inner cover from the outside.

Preferably, the present invention further includes a gas tube positioned in a plate hole formed at the center of the base plate to supply an internal atmosphere gas to an inner space of the inner cover.

Preferably, the present invention further includes a sealing plate interposed between the base plate and the support unit to support the gas tube.

Preferably, the main burner is installed on the opposite inner wall of the annealing furnace with the inner cover therebetween.

Preferably, the support unit is composed of a plurality of support pieces arranged on the lower side of the center of the base plate, the heat transfer space portion in which the sub-burner is selectively arranged is formed in the space between the plurality of support pieces.

Preferably, a plurality of inner covers are arranged side by side between opposing inner walls of the annealing furnace, and a plurality of base plates to which the plurality of inner covers are coupled is connected to one fuel supply unit via a fuel gas supply pipe. Each is heated via a subburner.

Preferably, the fuel gas supply pipe is provided with an automatic valve for opening and closing the fuel gas supply pipe by an electrical signal from the controller, and a manual valve for shutting off the supply of fuel gas in the event of a facility failure, and the automatic valve is supplied to one sub-burner. And a first automatic valve for shutting off the fuel gas, and a second automatic valve for shutting off the fuel gas supplied to the other sub-burner, wherein the first automatic valve and the first automatic valve are bypassed.

According to the present invention, the following remarkable effects can be realized.

First, the present invention has the advantage that by directly heating by installing a sub-burner in the lower portion of the base plate for supporting the coil, it is possible to quickly transfer heat to the lower portion of the coil, improve the overall productivity by shortening the process time .

Second, the present invention has the advantage that the upper and lower parts of the coil is uniformly heated, thereby improving the magnetic properties of the coil by reducing the magnetic deviation of the coil.

Third, the present invention has the advantage that the majority of the hydrogen gas used as a heat source of the sub-burner is used to heat the base plate, thereby greatly improving the heat transfer performance, and increase the amount of heat input of the coil to greatly reduce the magnetic quality variation in the coil. have.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing a heat treatment apparatus for an annealing process according to the prior art; FIG.
BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a directional electric steel sheet,
Figure 3 is a side cross-sectional view showing a heat treatment apparatus of a grain-oriented electrical steel sheet of a modified example of the present invention according to the first embodiment.
Figure 4 is a side cross-sectional view showing a heat treatment apparatus of a grain-oriented electrical steel sheet according to another modification of the present invention according to the first embodiment.
Figure 5 is a side cross-sectional view showing a heat treatment apparatus of a grain-oriented electrical steel sheet according to another modification of the present invention according to the first embodiment.
Figure 6 is a side cross-sectional view showing a heat treatment apparatus of a grain-oriented electrical steel sheet according to a second embodiment of the present invention.

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

The heat treatment apparatus of the grain-oriented electrical steel sheet according to the present invention, through the structure of heating the upper part of the coil by the indirect heating method and the lower part of the coil by the direct heating method, can quickly transfer heat to the coil, Allow the top and bottom of the to be heated uniformly.

This heat treatment apparatus includes a configuration for directly heating the lower part of the coil (first embodiment), and a configuration for controlling heating for the lower part of the coil (second embodiment).

2 is a side cross-sectional view of the heat treatment apparatus according to the first embodiment of the present invention.

As shown in FIG. 2, the heat treatment apparatus according to the first embodiment includes a base plate 100, an inner cover 200, a gas tube 300, a support unit 500, a sub-burner 710, and a main body. The burner 720 is configured to be provided in the annealing furnace 800 in which annealing of the electrical steel sheet is performed.

Specifically, the base plate 100 is formed in a circular plate shape, the coil (C) is placed on the upper surface, the lower surface is contacted and supported by the support unit 500. In the center of the base plate 100, a plate hole part 110 communicating with the center hole H of the coil C is formed in the center, where the center hole H of the coil C is the coil C. It is defined as the space formed at the center of winding when winding.

The sealing groove 120 is formed at the edge of the base plate 100. The sealing groove 120 is filled with the sealing member 400 when the base plate 100 and the inner cover 200 are coupled, and the lower edge portion 210 of the inner cover 200 is inserted.

In addition, the base plate 100 is composed of a steel (steel) material having excellent heat transfer characteristics. This is when the direct heating by the sub-burner 710 installed under the base plate 100, the heat of the sub-burner 710 is quickly and effectively transferred to the lower portion of the coil C through the base plate 100 made of steel To make it possible. Of course, the base plate 100 can be used in addition to the steel plate other types of high heat transfer rate.

The inner cover 200 has a container shape in which a lower portion thereof is opened, and the lower edge portion 210 is coupled to the sealing groove portion 120 of the base plate 100. In this case, the coil C mounted on the base plate 100 is accommodated in the inner space of the inner cover 200.

The inner cover 200 is indirectly heated by the main burner 720 installed inside the annealing furnace 800. For example, when the external atmosphere gas in the annealing furnace 800 is heated by the operation of the main burner 720, the inner cover 200 receives radiant heat to generate radiant heat, and the generated radiant heat is inside the inner cover 200. The upper side of the coil C accommodated in the coil C, more specifically, the coil C is heated. At this time, the lower portion of the coil (C) is directly heated by the heating of the sub-burner 710 installed in the lower portion of the base plate 100 to be described later.

Here, the external atmosphere gas is heated by the main burner 720 installed inside the annealing furnace 800 to be burner combustion atmosphere gas for indirectly heating the inner cover 200, the internal atmosphere gas is hydrogen, nitrogen or Composed of a reducing gas mixed with these, it is supplied to the inner space of the inner cover 200 through the gas tube (300).

The gas tube 300 is inserted into the plate hole 110 of the base plate 100 to supply an internal atmosphere gas to the inner space of the inner cover 200, which is an additional internal atmosphere gas supply pipe 740. From the gas tube 300 is supplied.

The gas tube 300 is inserted together with the sealing member 400 in the plate hole 110 of the base plate 100. At this time, the remaining plate hole 110, in which the gas tube 300 is not installed, is filled with a sealing member 400 for blocking the internal atmosphere gas and the external atmosphere gas. Preferably, the outer diameter of the gas tube 300 is designed to be wider than the outer diameter of the plate hole part 110, so that the gas tube 300 is supported on the outer diameter side of the plate hole part 110.

Sealing member 400 is for sealing the inner space of the inner cover 200 from the external atmosphere gas, the first sealing member 400 which is sealed at the coupling portion between the base plate 100 and the inner cover 200, The second sealing member 400 is sealed to the plate hole 110. The first sealing member 400 and the second sealing member 400 have the same height as the height of the base plate 100, and are made of the same material with only different positions.

These first sealing member 400 and the second sealing member 400 is preferably composed of sand. When the sealing member 400 is made of sand, it is possible to closely seal between the outer atmosphere gas and the inner atmosphere gas, and even if the shape of the base plate 100 is deformed by repeated thermal changes, the base plate 100 and the inner The sealing state between the covers 200 may be continuously maintained.

The support unit 500 is composed of a plurality of support pieces arranged on the lower side of the center of the base plate 100, the heat transfer space portion 501, the sub-burner 710 is selectively disposed in the space between the plurality of support pieces Is formed. The heat transfer space part 501 is a predetermined space provided under the base plate 100, and the sub burner 710 is provided in this space, whereby the lower portion of the coil C lying on the upper surface of the base plate 100. Can be heated directly.

The sub-burner 710 is a heating source for heating the base plate 100 and receives the hydrogen gas from a fuel supply unit (not shown) through the fuel gas supply pipe 730 to heat the base plate 100. When the base plate 100 is heated by the sub-burner 710 in this way, the heat may be directly transmitted to the lower portion of the coil C placed on the base plate 100.

In particular, when the plurality of inner covers 200 are arranged side by side between the inner walls of the annealing furnace 800, the plurality of sub plates may be provided in the base plates 100 to which the plurality of inner covers 200 are coupled, respectively. A burner 710 may be installed, and at this time, the plurality of sub-burners 710 are connected to one fuel supply unit (not shown) via a fuel gas supply pipe 730.

3 is a side cross-sectional view of a heat treatment apparatus as a modified example of the present invention according to the first embodiment.

As shown in FIG. 3, according to a modification of the first embodiment, the base plate 100 may be divided into a first base plate 100 and a second base plate 100.

The first base plate 100 is configured in a ring shape which communicates with the center hole H of the coil C, and the second base plate 100 is accommodated by the first base plate 100 and the sealing member 400. The mounting groove portion 101 is formed in a container shape formed inside.

That is, the second base plate 100 is disposed on the upper surface of the support unit 500, and the gas tube 300, the first base plate 100, and the seating groove 101 of the second base plate 100 are disposed. The sealing member 400 is accommodated and the coil C is placed on the upper surface of the first base plate 100.

4 is a side cross-sectional view of a heat treatment apparatus according to another modified example of the present invention according to the first embodiment, and FIG. 5 is a side cross-sectional view of a heat treatment apparatus according to another modified example of the present invention according to the first embodiment. to be.

As shown in FIG. 4, according to another modification of the first embodiment, a sealing plate 600 may be installed between the base plate 100 and the support unit 500.

The sealing plate 600 is configured in the form of a sealing gasket such as heat resistant ceramic paper to stably support the gas tube 300. For example, the sealing plate 600 is installed between the second base plate 100 and the support unit 500, and the first base plate 100 and the sealing member in the seating groove 101 of the second base plate 100. 400 is accommodated, the gas tube 300 and the sealing member 400 is mounted on the upper surface of the sealing plate 600.

In the present embodiment, a configuration in which a pair of heat treatment apparatuses are arranged side by side in the annealing furnace has been described, but as shown in FIG. 5, one heat treatment apparatus may be disposed in the annealing furnace.

6 is a side cross-sectional view of a heat treatment apparatus according to a second embodiment of the present invention.

On the other hand, as shown in Figure 6, the heat treatment apparatus according to the second embodiment, the base plate 100, the inner cover 200, the gas tube 300, the support unit 500, the sub-burner 710, It may be configured to include a main burner 720, automatic valve, controller 900 and manual valve (930). Here, the base plate 100, the inner cover 200, the gas tube 300, the support unit 500, the sub-burner 710 and the main burner 720 configuration is the base plate according to the first embodiment described above 100, the inner cover 200, the gas tube 300, the support unit 500, the sub burner 710, and the main burner 720.

However, an automatic valve and a manual valve 930 are attached to the fuel gas supply pipe 730 that supplies fuel gas to the sub burner 710, and the controller 900 is electrically connected to the automatic valve.

The automatic valve includes a first automatic valve 910 for blocking fuel gas supplied to one sub burner 710 and a second automatic valve 920 for blocking fuel gas supplied to another sub burner 710. The first automatic valve 910 and the second automatic valve 920 is automatically opened and closed by the electrical signal of the controller 900, the sub-burner 710 so that the lower temperature of the coil (C) is properly adjusted Control the fuel gas supplied to the fuel supply unit.

To this end, the base plate 100 is provided with a thermocouple (not shown) for measuring the lower temperature of the coil (C), the controller 900 is a lower temperature measurement value of the coil (C) measured in the thermocouple and preset After comparing the lower temperature proper value of the coil C, an electrical signal is applied to the automatic valve so that the lower temperature of the coil C is maintained at the proper temperature.

In addition, the first automatic valve 910 and the second automatic valve 920 are bypassed, and the controller 900 may provide an appropriate electrical signal to the first automatic valve 910 or the second automatic valve 920. By applying, the sub-burner 710 connected to the first automatic valve 910 or the second automatic valve 920 may be selectively controlled.

The manual valve 930 is installed at the entry side of the fuel gas supply pipe 730 through which the fuel gas flows into the first automatic valve 910 and the second automatic valve 920, and blocks the supply of fuel gas in the event of equipment failure. It plays a role.

The manual valve 930 is operated in an open state under normal circumstances, but if an abnormality occurs in the controller 900, the first automatic valve 910, the second automatic valve 920, or other equipment element, the manual valve 930 is operated manually. By shutting off the supply of fuel gas, it is possible to replace or repair an abnormal element while stopping the operation of the equipment.

In the present embodiment, a pair of heat treatment devices are provided in the annealing furnace 800, and a configuration in which two automatic valves are installed in the fuel gas supply pipe 730 connecting the pair of heat treatment devices has been described. The number of automatic valves may be added or subtracted according to the number of heat treatment devices installed in the 800.

As described above, the present invention can directly heat the base plate on which the coil is mounted through the sub-burner, so that the upper and lower portions of the coil can be uniformly heated, thereby improving the magnetic properties of the coil by reducing the magnetic deviation of the coil. It has excellent advantages such as.

Although the present invention has been described in detail using the preferred embodiments, the scope of the present invention is not limited to the specific embodiments, and should be interpreted by the appended claims. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the present invention.

100: base plate 101: seat groove
110: plate hole portion 120: sealing groove portion
200: inner cover 300: gas tube
400: sealing member 500: support unit
600: sealing plate 710: subburner
720: main burner 730: fuel gas supply pipe
740: internal atmosphere gas supply pipe 800: annealing furnace
900: controller 910: first automatic valve
920: second automatic valve 930: manual valve

Claims (7)

A heat treatment apparatus for a directional electric steel plate for uniformly heating an upper and lower portions of a coil,
A plurality of base plates on which coils are placed;
A plurality of inner covers having lower edges coupled to edges of the base plates to surround the coils;
A support unit for supporting a lower portion of the base plate;
A plurality of sub-burners installed in the support unit to directly heat each of the base plates, and connected to one fuel supply unit via a fuel gas supply pipe;
A thermocouple mounted to the base plate to measure the temperature of the lower portion of the coil; And
A main burner installed on an inner wall of the heat treatment apparatus with the inner cover interposed to heat the inner cover from the outside;
An automatic valve installed in the fuel gas supply pipe to open and close the fuel gas supply pipe; And
A controller configured to receive a preset lower temperature optimum value of the coil, receive lower temperature information of the coil from the thermocouple, and transmit an operation signal to the automatic valve by comparing with the lower temperature proper value. Heat treatment apparatus of steel plate. The method according to claim 1,
Heat treatment apparatus for a grain-oriented electrical steel sheet characterized in that it further comprises a gas tube located in the plate hole formed in the center of the base plate to supply the internal atmosphere gas to the inner space of the inner cover. The method according to claim 2,
Heat treatment apparatus for a grain-oriented electrical steel sheet further comprises a sealing plate interposed between the base plate and the support unit to support the gas tube. delete The method according to claim 1,
The support unit is composed of a plurality of support pieces disposed on the lower side of the center of the base plate, the heat transfer space portion is selectively formed in the space between the plurality of support pieces is a sub-burner is characterized in that Heat treatment device. delete The method according to claim 1,
The fuel gas supply pipe is provided with a manual valve for shutting off the supply of fuel gas in the event of equipment failure,
The automatic valve is composed of a first automatic valve for shutting off fuel gas supplied to one sub-burner, and a second automatic valve for shutting off fuel gas supplied to another sub-burner. 1 Automatic valve heat treatment apparatus of a grain-oriented electrical steel sheet, characterized in that the bypass is connected.

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