KR102305759B1 - Door apparatus for heating furnace - Google Patents

Abstract

The present invention relates to a door apparatus for a heating furnace capable of minimizing heat loss in a heating furnace by reducing an area through which external air can penetrate into a heating furnace when a slab is extracted, which includes a lower door; an upper door that is disposed on the lower door and is capable of elevating; an auxiliary door capable of elevating along one side of the lower door and one side of the upper door; and the auxiliary door and the upper door are respectively installed, and after the auxiliary door rises by a certain height, the auxiliary door and the upper door are caught, so that the upper door is raised together with the additional rise of the auxiliary door. including a locking part.

Description

Heating furnace door device

The present invention relates to, for example, a door device for opening and closing a heating furnace in order to extract a slab located inside the heating furnace, and to a door device for a heating furnace capable of minimizing heat loss to the heating furnace when the slab is extracted.

For example, the slab produced in the steel mill is put into the furnace for hot rolling, which is a post process, and the slab heated to a predetermined temperature is extracted through one side of the furnace.

This heating furnace has an extraction door for extracting the slab, and the heated slab is drawn out of the furnace through the extraction door using the fork of the extractor, and the drawn slab is moved toward the rolling roll by the transfer roll. .

It is desirable to maintain an appropriate temperature and pressure inside the furnace for heating the slab. When the extraction door is opened to extract the slab, the high-temperature gas inside the furnace is is discharged to the outside of the furnace, and at the same time, low-temperature air from the outside of the furnace is introduced into the furnace.

As such, when the extraction door is opened, the area exposed to external air inevitably increases, thereby lowering the temperature in the heating furnace and adversely affecting the quality of the product, as well as increasing the amount of fuel used, resulting in wastage of energy.

(Patent Document 1) KR 1128941 B1

Accordingly, an object of the present invention is to provide a door device for a heating furnace capable of minimizing heat loss in the heating furnace by reducing the area and time in which external air can penetrate into the heating furnace when the slab is extracted.

A door device for a heating furnace according to an embodiment of the present invention includes: a lower door; an upper door that is disposed on the lower door and is capable of elevating; an auxiliary door capable of elevating along one side of the lower door and one side of the upper door; and the auxiliary door and the upper door are respectively installed, and after the auxiliary door rises by a certain height, the auxiliary door and the upper door are caught, so that the upper door is raised together with the additional rise of the auxiliary door. It is characterized in that it includes a locking portion.

As described above, according to the present invention, only the part that interferes with the extractor can be opened first, so that the area and time for external air to penetrate into the heating furnace during extraction of the slab is reduced, thereby reducing the inflow of low-temperature air into the heating furnace It has the effect of minimizing the heat loss caused by it.

1 is a perspective view illustrating a door device of a heating furnace according to an embodiment of the present invention.
FIG. 2 is a front view showing the lower door and the upper door shown in FIG. 1 separated.
3 is a plan view of FIG. 2 .
FIG. 4 is a front view of the auxiliary door shown in FIG. 1 .
5 is a front view illustrating a state in which the lower door, the upper door, and the auxiliary door are combined.
6 is a plan view of FIG. 5 .
7 to 9 are views for explaining the operation of the door device of the heating furnace according to an embodiment of the present invention.

Hereinafter, it will be described in detail with reference to exemplary drawings of the present invention. Note that in adding reference numerals to the components of each drawing, the same components are given the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a perspective view illustrating a door device of a heating furnace according to an embodiment of the present invention.

The door device of the heating furnace according to an embodiment of the present invention opens an opening on one side of the heating furnace 1, so that the material S such as a heated slab can be extracted or transported. This door device includes doors installed so as to be movable up and down, that is, in the height direction, on one side of the heating furnace.

When the material S injected into the heating furnace 1 is heated, the door device closes the opening of the heating furnace to block the internal heat of the heating furnace. On the other hand, when the heating of the material by the heating furnace is completed, the door of the door device rises by a certain height, and in order to take out the material, the fork 2 of the extractor enters the heating furnace and enters the fork groove (not shown). inserted, and the material can then be extracted from the furnace.

A door device for a heating furnace according to an embodiment of the present invention, the lower door 10; an upper door 20 that is disposed on the lower door and can be lifted; Auxiliary door 30 capable of elevating along one side of the lower door and one side of the upper door; and a locking part 40 that is installed on the auxiliary door and the upper door, respectively, and causes the upper door to rise together with the additional rise of the auxiliary door as the auxiliary door is caught between the auxiliary door and the upper door after the auxiliary door rises by a certain height may include.

A more detailed description of the configuration and operating relationship of the lower door 10, the upper door 20, and the auxiliary door 30 will be described below with reference to FIGS. 2 to 9 .

The door device of the heating furnace according to an embodiment of the present invention may further include a lifting driving unit 50 installed in the heating furnace 1 to raise and lower the auxiliary door 30 .

The lifting driving unit 50 may be located on the upper portion of the heating furnace 1 , and may connect the auxiliary door 30 and the weight unit 60 . The auxiliary door and the weight are moved in opposite directions to each other by the lift driving unit.

The lift driving unit 50 may include a shaft 51 , a plurality of weight wheels 52 , a plurality of connecting members 53 , and the like.

The shaft 51 is formed, for example, in a bar shape of a circular cross section, and is installed horizontally and rotatably on the upper portion of the heating furnace 1 . The shaft may be located along the upper tip adjacent the opening of the furnace.

The plurality of weight wheels 52 are spaced apart from each other and fixedly disposed on the shaft 51 , and may rotate together with the shaft.

At least one of the plurality of connecting members 53 is connected to the auxiliary door 30 , and is wound around the corresponding weight wheel 52 . The other one of the plurality of connecting members is connected to the weight unit 60 and wound around the corresponding weight wheel.

A chain or wire rope made of a metal material may be employed as the connecting member 53 , and accordingly, the weight wheel 52 may also be formed in the form of a sprocket or a drum depending on the shape of the connecting member.

The lift driving unit 50 may include a motor 54 connected to the shaft 51 to rotate the shaft. The motor 54 generates a rotational force and can control the rotational direction of the shaft. That is, the shaft may be rotated in one direction or in the reverse direction by the motor.

A gearbox 55 or a chain mechanism 56 may be interposed between the motor 54 and the shaft 51 . When a gearbox is adopted, the rotational force of the motor may be transmitted to the shaft in an increased state. In addition to this or when a chain mechanism is employed without a gearbox, the rotational force of the motor can be accurately transmitted to the shaft without loss to rotate the shaft.

On the other hand, the weight portion 60 is connected to at least one of both ends of the longitudinal direction of the shaft 51, it may be located in the side of the heating furnace (1). Such a weight portion can be accommodated in a casing (not shown), properly protected, and smoothly guided up and down.

In addition, the weight unit 60 is composed of a plurality of plates each having a predetermined weight, and may be assembled in a vertically stacked state. For this reason, the weight unit can adjust the weight by adjusting the number of plates.

The operation of the lift driving unit 50 having the above-described configuration will be briefly described.

For example, when the shaft 51 rotates in one direction by driving the motor 54, the connecting member 53 connected to the auxiliary door 30 moves the auxiliary door upward while being wound around the corresponding weight wheel 52, That is, at the same time as lifting, the connecting member connected to the weight unit 60 moves the weight unit downward while being released from the corresponding weight wheel.

On the other hand, when the shaft 51 rotates in the reverse direction by the reverse driving of the motor 54 , the connecting member 53 connected to the auxiliary door 30 is released from the corresponding weight wheel 52 and moves the auxiliary door downward. That is, at the same time as the lowering, the connecting member connected to the weight unit 60 moves the weight unit upward while being wound around the corresponding weight wheel.

As such, the rotation of the motor 54 and the shaft 51 of the lift driving unit 50 implements the movement in the height direction of the auxiliary door 30 and the movement in the reverse direction and the height direction of the weight unit 60 accordingly. do. Accordingly, the door device can open and close the opening on one side of the heating furnace 1 by the doors.

FIG. 2 is a front view showing the lower door and the upper door shown in FIG. 1 separated from each other, and FIG. 3 is a plan view of FIG. 2 . 4 is a front view of the auxiliary door, FIG. 5 is a front view illustrating a state in which the lower door, the upper door, and the auxiliary door are combined, and FIG. 6 is a plan view of FIG. 5 .

The lower door 10 has a substantially rectangular parallelepiped shape and is fixedly disposed on the ground or at the bottom of the equipment in front of the opening of the heating furnace 1 .

In addition, the lower door 10 is formed with a plurality of through grooves 12 through which the fork 2 of the extractor for transport of the material (S) such as a heated slab can pass through. Each of these through grooves may have a substantially U-shaped cross section by sailing from the upper surface of the lower door to the lower surface of the lower door by a predetermined depth.

Behind the lower door 10, the fork groove of the heating furnace into which the fork 2 of the extractor is inserted may be located. The fork groove and the through groove 12 of the lower door communicate with each other so that the fork can be smoothly inserted into the fork groove, and the height of the through groove 12 is properly aligned, and the cross-sectional shape and cross-sectional area of the through groove are the same as the fork groove or have a cross-sectional shape It is better to have the same cross-sectional area as the fork groove and slightly larger than the fork groove. In other words, it is preferable that the fork groove of the heating furnace and the through groove of the lower door are formed to correspond to each other.

A first guide groove 11 extending in the height direction may be formed on one side of the lower door 10, for example, the front surface, and the auxiliary door 30 is connected to the lower door along the first guide groove. It can move relative to each other stably in the height direction. The first guide groove is formed to open toward the front, upper and lower surfaces of the lower door.

In addition, a plurality of through grooves 12 are formed in the wall portion of the first guide groove in the first guide groove 11, so that the first guide groove and the through groove communicate with each other.

The upper door 20 has a substantially rectangular parallelepiped shape, and is installed so as to be able to move up and down in front of the opening of the heating furnace 1 from which the material S, such as a heated slab, is extracted. The upper door may be installed to engage with each other on the lower door 10 .

For example, a centrally protruding engagement protrusion 23 is formed on the lower surface of the upper door 20 , and a centrally concave engagement groove 13 is formed on the upper surface of the lower door 10 , and these engagement projections and engagement grooves are formed on the upper surface of the lower door 10 . These may be configured to engage with each other.

In addition, a sand layer (not shown) containing silica sand or the like may be accommodated in the meshing groove 13 . Accordingly, when the upper door 20 is engaged with each other to the lower door 10 to close the opening of the heating furnace 1, airtightness between the upper door and the lower door can be secured.

A second guide groove 21 extending in the height direction may be formed on one side, for example, the front surface of the upper door 20 , and the auxiliary door 30 moves in the height direction with respect to the upper door along the second guide groove. Able to move stably. The second guide groove is formed to open toward the front and upper and lower surfaces of the upper door.

The second guide groove 21 has the same width (length in a direction perpendicular to the height direction) and depth (length in the thickness direction of the lower door 10) as the first guide groove 11, the auxiliary door (30) It is preferable for smooth lifting and lowering movement.

On the upper surface of the upper door 20, a hook holder 41 constituting the locking part 40 is installed upright, and the hook 42 of the auxiliary door 30 to be described later is coupled to the hook holder.

The hook holder 41 may be formed as a member of a substantially door shape, and the lower end of each leg may be fixed to the upper surface of the upper door 20 to have a closed cross-section ring shape. In other words, the hook movement hole 43 may be formed in the hook holder toward the side of the upper door.

The auxiliary door 30 is disposed on the outer surfaces of the lower door 10 and the upper door 20 , and is connected to the connecting member 53 of the above-described elevating driving unit 50 to move up and down in the height direction.

This auxiliary door 30, when the first guide groove 11 is formed in the lower door 10 and the second guide groove 21 is formed in the upper door 20, the first guide groove and the second It may have a shape and size that can be at least partially inserted into the guide groove.

In addition, as shown in the drawings, the auxiliary door 30 may have a height sufficient to cover the heights of the lower door 10 and the upper door 20, but is not necessarily limited thereto, and at least the It is good to have a height that can cover the height.

On the upper surface of the auxiliary door 30, a hook 42 constituting the locking part 40 is installed to protrude to the side of the auxiliary door, and this hook is coupled with the hook holder 41 of the upper door 20 described above. do.

The hook 42 is inserted into the hook movement hole 43 of the hook holder 41 and can be moved according to the lifting movement of the auxiliary door 30 within the hook movement hole, and when the auxiliary door rises above a predetermined height The hook is caught on the end 44 of the moving hole.

In this specification and drawings, the configuration of the locking part 40 is illustrated while explaining the hook 42 and the hook holder 41 having a hook moving hole 43, but the configuration of the locking part is not necessarily limited thereto. , if the same operating relationship can be exhibited, for example, it may be provided as a pair of pillar members or protruding members that are appropriately disposed on the auxiliary door 30 and the upper door 20 and extend in a direction perpendicular to each other.

Accordingly, it is possible to apply a driving force to the upper door 20 to further raise the auxiliary door 30 through the engaging part 40, so that the upper door can rise together with the additional rise of the auxiliary door. there will be

In particular, due to the locking part 40, the auxiliary door 30 is raised to a certain height by the lift driving unit 50 including one motor 54, and then the upper door 20 can also be raised together. The advantage of being able to configure a door device is obtained.

In addition, since the opening of the heating furnace 1 can be differentially opened due to this configuration, the area and time for which external air can penetrate into the heating furnace when extracting a material such as a slab can be reduced.

7 to 9 are views for explaining the operation of the door device of the heating furnace according to an embodiment of the present invention.

First, the doors of the door device close the opening of the heating furnace until the material S, such as a slab, carried into the heating furnace 1, is heated to a temperature suitable for the post-processing to prevent the heat inside the heating furnace from escaping. prevent (see Fig. 7).

When the heating of the material (S) is completed, the fork (2) of the extractor enters into the heating furnace (1) to take it out and must be inserted into the fork groove.

To this end, the motor 54 of the elevating driving unit 50 is driven to rotate the shaft 51 in one direction, and accordingly, the connecting member 53 connected to the auxiliary door 30 is wound around the corresponding weight wheel 52 . While moving the auxiliary door upward (see FIG. 8), the connecting member connected to the weight unit 60 moves the weight unit downward while being released from the corresponding weight wheel.

At this time, the auxiliary door 30 can move relative to the lower door and the upper door in the height direction along the first guide groove 11 of the lower door 10 and the second guide groove 21 of the upper door 20 . have.

In addition, the hook 42 of the auxiliary door 30 inserted into the hook movement hole 43 of the hook holder 41 of the upper door 20 moves in the height direction according to the lifting movement of the auxiliary door in the hook movement hole. can move

The rotation of the motor 54 and the shaft 51 of the lifting drive unit 50 raises the auxiliary door 30 by a predetermined height. The lower end of the auxiliary door is at a height that sufficiently exposes the through groove 12 of the lower door 10 and the fork groove of the heating furnace 1, for example, at a height equal to or higher than the upper surface of the lower door. can be moved until

In this way, when the fork 2 of the extractor enters the heating furnace 1, it is possible to prevent the heat from leaking to the outside by preventing the opening of the heating furnace from being completely opened. That is, since the upper door 20 is not raised, heat loss due to unnecessary opening of the door can be significantly reduced.

The fork 2 of the extractor is further moved horizontally until it reaches the lower surface of the material S. Then, by raising the fork approximately vertically, the material placed on the skid (not shown) in the heating furnace 1 is seated on the fork.

In order to seat the material S on the fork by vertically raising the fork 2 in this way, the motor 54 and the shaft 51 of the elevating drive unit 50 rotate further in one direction so as not to interfere with the rising fork to assist In addition to raising the door 30 by a certain height, the upper door 20 must also be raised. In this case, the opening of the heating furnace 1 can be fully opened.

The motor 54 of the elevating driving unit 50 is further driven to further rotate the shaft 51 in one direction, and accordingly, the connecting member 53 connected to the auxiliary door 30 is wound around the corresponding weight wheel 52 . At the same time as moving the auxiliary door further upward (refer to FIG. 9), the connecting member connected to the weight unit 60 is released from the corresponding weight wheel to further move the weight unit downward.

At this time, the auxiliary door 30 may move relative to the upper door along the second guide groove 21 of the upper door 20 in the height direction.

In addition, the hook 42 of the auxiliary door 30 inserted into the hook movement hole 43 of the hook holder 41 of the upper door 20 is caught by the end 44 of the hook movement hole.

Accordingly, it is possible to apply a driving force to the upper door 20 to further raise the auxiliary door 30 through the engaging part 40, so that the upper door can rise together with the additional rise of the auxiliary door. have.

The additional rising height of the auxiliary door 30 allows the lower end of the raised auxiliary door and upper door 20 to be located at a higher point than the upper end of the fork 2 or the upper surface of the material S seated on the fork height can be determined.

For example, by installing a sensor such as, for example, a cam-type limit switch in the motor 54 constituting the lift driving unit 50, the motor is operated until the lower end of the auxiliary door 30 matches the upper surface of the lower door 10. It rotates so that the auxiliary door can be moved, and from when the signal that the fork (2) of the extractor rises is transmitted until the lower end of the auxiliary door is located at a point higher than the top of the fork, the motor rotates further to make the auxiliary door move. It can be controlled so that it can be raised further.

After the opening of the heating furnace 1 is opened by a predetermined interval between the lower door 10 and the upper door 20, the fork 2 of the extractor on which the material S is seated comes out of the heating furnace, 50) drives the motor 54 in the reverse direction so that the shaft 51 rotates in the reverse direction, and accordingly, the connecting member 53 connected to the auxiliary door 30 is released from the corresponding weight wheel 52 and opens the auxiliary door. At the same time as moving downward, the connecting member connected to the weight unit 60 moves the weight unit upward while being wound around the corresponding weight wheel.

As a result, the doors of the door device are lowered to their original positions so that the heating furnace 1 can be closed again.

In this way, by dividing the opening of the door into two steps, it not only prevents the heat inside the heating furnace from leaking due to the opening of the door, but also reduces the area and time for outside air to enter into the heating furnace. It is possible to minimize the heat loss in the heating furnace.

As described above, according to the present invention, a plurality of through grooves through which the fork of the extractor can pass are formed in the fixed lower door, and by configuring these through grooves to be opened and closed by the auxiliary door, only the parts that interfere with the extractor are formed. It can be opened first, so that the fork of the extractor can enter the heating furnace, and the upper door can be opened by the additional raising and jamming of the auxiliary door only for the time required for extraction of the material.

As the complete opening time of the opening of the heating furnace by the upper door is shortened, the phenomenon that cold outside air flows into the heating furnace and the high-temperature gas inside the heating furnace leaks to the outside of the heating furnace is suppressed as much as possible, Accordingly, it is possible to reduce the heat loss of the heating furnace to improve the thermal efficiency as well as to greatly improve the quality of the material.

Moreover, since it is possible to stably maintain the temperature inside the heating furnace, the waste of fuel required for heating and maintaining the temperature can be eliminated, so the present invention is very useful from an economical point of view.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

1: Furnace 2: Fork
10: lower door 11: first guide groove
12: through groove 13: engagement groove
20: upper door 21: second guide groove
23: interlocking protrusion 30: auxiliary door
40: hook 41: hook hanger
42: hook 43: hook moving hole
44: end 50: elevating drive unit
51: shaft 52: weight wheel
53: connection member 54: motor
55: gearbox 56: chain mechanism
60: weight part

Claims (8)

lower door;
an upper door that is disposed on the lower door and is capable of elevating;
an auxiliary door capable of elevating along one side of the lower door and one side of the upper door; and
It is installed in the auxiliary door and the upper door, respectively, and after the auxiliary door rises by a certain height, the auxiliary door and the upper door are caught, so that the upper door is raised together with the additional rise of the auxiliary door jam part
A door device of a heating furnace comprising a.
According to claim 1,
A door device for a heating furnace in which a plurality of through grooves through which a fork of an extractor for transporting a material can pass are formed in the lower door.
According to claim 1,
A first guide groove extending in the height direction is formed on one side of the lower door, and a second guide groove extending in the height direction is formed on one side of the upper door, so that the first guide groove and the second guide groove are formed. A door device for a heating furnace in which the auxiliary door moves relative to the lower door and the upper door in a height direction along a groove.
According to claim 1,
A protruding meshing protrusion is formed on the lower surface of the upper door, and a concave meshing groove is formed on the upper surface of the lower door, so that the meshing protrusion and the meshing groove are engaged with each other.
5. The method of claim 4,
The door device of the heating furnace in which the sand layer is accommodated in the engagement groove.
According to claim 1,
The locking part,
a hook holder installed upright on the upper surface of the upper door;
A hook installed to protrude laterally from the upper surface of the auxiliary door
A door device of a heating furnace comprising a.
7. The method according to any one of claims 1 to 6,
The door device of the heating furnace further comprising an elevation driving unit installed in the heating furnace to raise and lower the auxiliary door.
8. The method of claim 7,
The lifting drive unit,
a shaft rotatably installed on the upper portion of the heating furnace;
a plurality of weight wheels fixedly disposed on the shaft and rotated together with the shaft;
a plurality of connecting members connected to the auxiliary door and the weight unit and respectively wound around the corresponding weight wheel among the plurality of weight wheels; and
A motor connected to the shaft to rotate the shaft
A door device of a heating furnace comprising a.

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