JPH08159456A - Door for heating furnace - Google Patents

Abstract

PURPOSE: To obtain a door for a heating furnace, which does not trouble in the elevation thereof, by a method wherein the inside of a peripheral frame of an elevating door is constituted of solid refractories and, in addition thereto, at least one row of solid refractories are arranged at the central part of the door in up-and-down direction, in the elevating door, covering the charging port of a work to be heated for a heating furnace and lined with a ceramic fiber heat insulating layer. CONSTITUTION: A door is constituted of a structure wherein a part of the surface of the door except a peripheral frame 10 or the vicinity of a central part, seen from the front surface substantially, is constituted of at least one row of solid refractories 6, arranged in up-and-down direction, instead of ceramic fiber 11. The solid refractories are arranged by a method wherein a multitude of anchors 12 are welded to the inside of an iron skin at predetermined positions and kneaded solid refractories 6 are stamped thereon. The number of solid refractories 6 can be one row or more than three rows while the width or space can be determined by a surface pressure received by the door. According to this structure, the inward deformation of the door due to a temperature difference between the inside and the outside of the door can be restrained and, as a result, the solid refractories 6, lined on the peripheral frame 10, will never be contacted with so-called lintel 7 or the end wall 8 of the furnace.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door for a heating furnace, and more particularly, when a steel product such as a continuous cast slab is hot-rolled to produce a thick plate, a bar steel or the like, before carrying out the hot-rolling. It is related to the door structure of a continuous heating furnace that keeps a steel material at a predetermined temperature.

[0002]

2. Description of the Related Art As shown in FIG. 2, a continuous heating furnace used for hot rolling, thick plate rolling, strip rolling, etc. of steel is a steel that has been conveyed from the previous process by a charging device such as a pusher or a charger. While the cold piece, the hot piece and the hot piece of No. 1 are charged from the furnace inlet 2 and conveyed to the furnace extraction port 4 by the walking beam 3, the steel material 1 is heated to a predetermined temperature and soaked.

By the way, the door 5 of this continuous heating furnace is usually made of iron on the outside air side, and the entire inside of the furnace is made of a refractory, and the iron shell on the outside air side is cooled by cooling water piping. is there. For the refractory material lined in the door 5, a solid refractory material (such as castable) was used before, but in recent years, in order to reduce the weight of the door 5 or improve the heat insulating property, a ceramic fiber is used. It's being used. FIG. 3 shows a typical refractory structure of a so-called ceramic fiber type door.

[0004]

The above-mentioned ceramic fiber type door is certainly very effective in reducing the weight and improving the heat insulating property, and recently, most furnaces use this type of door. . However, when the door 5 of the system of FIG. 3 is used for a long period of time, it has been found that the door 5 is deformed toward the inside of the furnace due to the temperature difference between the inside and outside thereof, as shown in FIG. And as this deformation grows,
A solid refractory material 6 stretched on the outer peripheral frame 10 when the door 5 is opened and closed is a so-called linter 7 (a member horizontally extending above the furnace opening) of the heating furnace inlet 2 and a furnace end wall 8, and FIG. And 5
As shown in (b), they come into contact with each other and interfere with each other. Therefore, the chain 9 that suspends the door 5 and the lintel 7 are
As a result, a large impact is applied to the refractory, which often causes the refractory of the Lintel 7 to fall off or the chain 9 to be cut off, which hinders smooth heating work.

Therefore, in view of the above situation, an object of the present invention is to provide a heating furnace door which does not hinder the vertical movement even if most of the inner surface is a ceramic fiber type.

[0006]

In order to achieve the above object, the inventor diligently reviewed the defects of the ceramic fiber type door, and came up with the present invention. That is, the present invention is a lift door that covers a heated material inlet of a heating furnace and is lined with a ceramic fiber heat insulating layer. It is a door for a heating furnace in which at least one row of solid refractories is arranged in the direction. Further, the present invention is also a door for a heating furnace, wherein the solid refractory material is one kind selected from castable refractory material, plastic refractory material and refractory brick.

In this case, the solid refractory material is not one produced by laminating fibrous raw materials like a ceramic fiber heat insulating material, but a predetermined amount of powdery raw materials is mixed, kneaded and worked. Refractory that hardens afterwards, or refractory that has a fixed shape and hardens before construction, such as brick.

[0008]

In the present invention, the heating material charging port of the heating furnace is covered,
In the lift door lined with a ceramic fiber heat insulation layer,
In addition to the solid refractory inside the surrounding frame of the lift door, at least one row of solid refractory is arranged in the vertical direction of the central portion, so that the lift door has a difference in temperature inside and outside thereof. Even if the deformation toward the inside of the furnace due to the above occurs, the deformation is suppressed by the newly provided solid refractory material. As a result, when the elevator door is opened and closed, the solid refractory material stretched around the door outer frame does not come into contact with the so-called lintel at the furnace entrance or the furnace end wall, and the lintel refractory material does not fall off or the chain is broken. Further, in the present invention, since the solid refractory material is one kind selected from castable refractory material, plastic refractory material, and refractory brick, it is possible to reliably achieve the above effect at almost the same manufacturing cost as that of the steel material. Smooth heating became possible. Hereinafter, the content of the present invention will be specifically described with reference to FIG.

[0009]

EXAMPLE A structure of a heating furnace door according to the present invention is shown in FIG. As is apparent from FIG. 1, in the present invention, a part of the surface of the door 5 other than the peripheral frame 10 (almost in the vicinity of the central portion when viewed from the front).
In place of the ceramic fiber 11, the solid refractory 6 is arranged in two rows in the vertical direction. In this embodiment, a large number of anchors 12 are welded to a predetermined position inside the steel shell, and the kneaded castable refractory material is stamped on the anchors. However, in the present invention, any conceivable arrangement method may be adopted. Further, in this embodiment, the solid refractories 6 are arranged in two rows near the center of the inner surface of the door 5, but the number may be one row or three rows or more depending on the size of the door 5. That is, the width and interval of the solid refractory material 6 are determined by the surface pressure that the door 5 receives. For example, in the case of a door having a width of 6.5 m and a length of 2.3 m in FIG. The distance between the two rows was 900 mm. And by the improvement of this door structure, the door of FIG.
It can be expected that it can be used without any repairs for about 10 years, and of course the outer frame 10 of the door 5 is the so-called Linkel 7 during that time.
There is no trouble of colliding with the furnace end wall 8.

It should be noted that although all of the above explanations have been made in the heating furnace in which the object to be heated is the steel material 1, it goes without saying that the heating furnace in which the door 5 according to the present invention is applied is not limited to the steel material 1. Yes.

[0011]

As described above, according to the present invention, even in a heating furnace having a ceramic fiber type door, the door can prevent contact with the so-called linkel of the furnace inlet and the furnace end wall when opening and closing, and the chain. Trouble such as cutting loss was solved. As a result, the heating operation is not interrupted on the way, and the production of thick plates, bar steel and the like can be performed smoothly and efficiently.

[Brief description of drawings]

FIG. 1 is a view showing a door for a heating furnace according to the present invention,
(A) is the back side of the front surface of the door, (b) is a cross section taken along the line AA of (a), and (c) is a vertical cross section of (a).

FIG. 2 is a vertical cross-sectional view of a continuous heating furnace.

3A and 3B are diagrams showing a conventional ceramic fiber-lined door, in which (a) is the back side of the front of the door, and (b) is A of (a).
-A arrow cross section, (c) is a vertical cross section of (a).

FIG. 4 is a schematic view showing a deformation state of a conventional door.

FIG. 5 is a schematic view showing a problem of a conventional door, (a)
Shows the door rising, and (b) shows the door descending.

[Explanation of symbols]

 1 Steel Material 2 Furnace Inlet 3 Walking Beam 4 Furnace Extraction Port 5 Door 6 Solid Refractory 7 Lintel 8 Furnace End Wall 9 Chain 10 Surrounding Frame 11 Ceramic Fiber 12 Anchor 13 Iron Outer Shell 14 Water Cooling Pipe

Claims (2)

[Claims] 1. An elevating door which covers a heating material inlet of a heating furnace and is lined with a ceramic fiber heat insulation layer, wherein a solid refractory is provided on the inside of a peripheral frame of the elevating door, and a central upper and lower parts thereof are provided. A door for a heating furnace in which at least one row of solid refractories is arranged in the direction. 2. The heating furnace door according to claim 1, wherein the solid refractory material is one of castable refractory material, plastic refractory material, and refractory brick.