JP2002031482A - Small-sized cupola - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply, easily and efficiently conduct repairing of a refractory in a small-sized cupola from outside. SOLUTION: In the small-sized cupola, comprising refractories 4 adhered to an interior and a melting capability of substantially 5 t/hr or lower, a prescribed peripheral part 1A of a furnace body 1 around the vertical axis of a portion, having a melting zone 2 of the body 1 as a body is divided openably and closably, a connecting gap between the part 1A and the body 1 is buried with monolithic refractories 4A and a fixing means 3 which is detachable and attachable at the part 1A from and to the body 1 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a small cupola for melting cast iron and the like.

[0002]

2. Description of the Related Art Small cupolas are used to melt cast iron and the like. However, small cupolas having a melting capacity of 5 t / hr or less have a short operation time of 5 to 8 hr / day.
At present, the life of the refractory used in the melting zone of the furnace body is short, and it is necessary to repair each operation once.

[0003]

The erosion of the refractory of the furnace main body mainly appears in the range of about 1000 mm above and below the tuyere level, that is, in the melting zone. 600mm in 2t / hr furnace, 8 in 5t / hr furnace
It is very small, 50mm. Therefore, when repairing part of the refractory inside the furnace (overcoating) or refilling the refractory (brick), the worker inserts his body into the narrow inside,
It was very difficult to perform chipping, overcoating, and brick replacement, and it was inefficient because it was difficult to use breakers and other tools because of the small space, and it had to be done manually. .

[0004] In addition, since work is performed in a semi-closed space,
Dust generated at the time of repair (scraping, etc.) deteriorates the working environment and, as described above, the repair cycle (every day) is short, resulting in high temperature work in a state where the furnace body cannot be completely cooled. There is.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to make it possible to easily and efficiently repair a refractory in a small cupola from the outside.

[0006]

In order to achieve the above object, a small cupola according to the present invention is a small cupola having a refractory 4 stuck inside and having a melting capacity of about 5 t / hr or less, and comprising a furnace. A predetermined peripheral portion 1A around the longitudinal axis of the furnace main body 1 is divided and configured to be freely openable and closable at a portion mainly composed of the melting zone 2 of the main body 1, and a joining gap between the peripheral portion 1A and the furnace main body 1 is irregularly shaped. Fixing means 3 which is buried with an object 4A and the peripheral portion 1A of which is detachable from the furnace main body 1.
Is provided.

[0007] The small cupola having a dissolving capacity of about 5 t / hr or less referred to in the present invention refers to one having a dissolving capacity of substantially 5 t / hr, but as apparent from the object of the present invention, It is to be understood that it refers to all small cupolas whose inner diameter of the furnace body is so small that it is difficult to repair (partly and completely refill) internal refractories.

In the present invention, it is preferable that the fixing means 3 comprises hinge means 3A provided on one side of the peripheral portion 1A and cotter means 3B provided on the other side.

In the present invention, the fixing means 3 may comprise cotter means 3B provided on one side and the other side of the peripheral portion 1A.

In the present invention, it is preferable that the peripheral portion 1A is 180 degrees of the furnace main body 1.

[0011]

According to the miniature cupola of the present invention,
A predetermined peripheral portion 1A around the longitudinal axis of the furnace main body 1 is divided and configured to be openable and closable at a portion mainly including the melting zone 2 of the furnace main body 1,
Fixing means 3 in which a joining gap (parting surface) between the peripheral portion 1A and the furnace main body 1 is filled with an irregular-shaped refractory 4A, and the peripheral portion 1A is detachable from the furnace main body 1.
After the operation time (for example, after 8 hours) is completed, cooling is performed for a predetermined time, and then the peripheral portion 1A is cooled.
Is removed by releasing the fixing means 3, and the inner surface of the removed peripheral portion 1 </ b> A is subjected to surface fraying, overcoating (irregular refractory), and from the opened portion of the furnace main body 1 to the inner inner wall. Easily, from the outside using appropriate tools such as breakers, razors, refractories (bricks)
Replacing or topcoating can be performed.

[0012] Then, dust is generated at the time of such a filing operation or refractory (brick) replacement operation. As described above, since the removed peripheral portion 1A is operated under open air, it is necessary to use a dust collection system in a factory. Since there is no problem and the inside of the furnace main body 1 is operated from the outside opened by removing the peripheral portion 1A, the influence on the human body can be avoided. At the same time, even if the repair is performed in a short cycle, the repair work is performed without putting the body inside the high-temperature furnace body 1, so that the work can be performed easily.

In the present invention, when the fixing means 3 comprises hinge means 3A provided on one side of the peripheral portion 1A and cotter means 3B provided on the other side, the cotter is simply removed. Then, by simply opening and closing the peripheral portion 1A with the hinge means 3A like a door, the inside can be easily exposed and repair can be easily performed.

In the present invention, when the fixing means 3 comprises cotter means 3B provided on one side and the other side of the peripheral portion 1A, after removing the cotter on either side, the peripheral section 1A is removed. If the part 1A is suspended from the furnace main body 1 by, for example, hanging it with a chain hoist or the like, the repair work can be easily performed thereafter as described above.

In the present invention, if the peripheral portion 1A is 180 degrees (half-split) of the furnace body 1, the opening is large, and the subsequent repair work (severing, overcoating, re-placing) can be performed very easily. . However, there is no problem even if the opening is about 120 degrees, and depending on the situation at the site, a very small angle opening (100 degrees, 90 degrees, etc.) may be used as long as the repair work can be performed from the outside. Even so, the object of the present invention will be achieved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a small cupola according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially longitudinal front view of a main part of a furnace body 1 of a small cupola, in which a right side of a central longitudinal axis shows a fixed side and a cross-sectional state, and a left side shows a movable side (a peripheral portion 1A described later). Show the appearance. FIG.
FIG. 2 is a cross-sectional view of a main part of the furnace main body 1. FIG. 3 shows the furnace body 1
FIG. 4 is an enlarged plan view of a main part showing one hinge means 3A (portion indicated by A in FIG. 2) of the fixing means 3 of FIG. 3, and FIG. 4 is a side view of FIG. FIG. 5 is an enlarged plan view showing the other cotter means 3B (portion indicated by B in FIG. 2) of the fixing means 3, and FIG. 6 is a side view thereof.

This small cupola is a small cupola for melting cast iron having a melting ability of about 5 t / hr with a refractory 4 (fire-resistant brick) adhered inside.
In a portion mainly composed of about 1000 mm to 1500 mm above and below the tuyere level (most severe erosion), a 180 ° circumferential portion 1A around the longitudinal axis of the furnace body 1 is in a state shown by a virtual line in FIG. It is divided into openable and closable parts, that is, it is configured in half.

The joint gap (parting surface) between the peripheral portion 1A and the furnace body 1 is filled with an irregular refractory 4A (for example, G-Pax / trade name) as shown in FIGS. I have. The filling of the irregular-shaped refractory 4A is performed by a commonly used rammer. Further, a fixing means 3 is provided to make the peripheral portion 1A detachable from the furnace main body 1. Here, as shown in an enlarged manner in FIGS. 3 to 6, the fixing means 3 includes a pair of hinge means 3A provided on one side of the peripheral portion 1A in a vertical direction and a pair of hinge means 3A provided on the other side in a vertical direction. And cotter means 3B.

Accordingly, the opening and closing of the peripheral portion 1A is performed by pulling out and inserting the cotter 3b of the cotter means 3B with respect to the engaging pin 3c, thereby rotating the hinge means 3A about the longitudinal axis. Easy to do.

In FIG. 1, reference numeral 5A denotes a cooling water pipe on the fixed side of the furnace main body 1, 5B denotes a cooling water pipe attached to the peripheral portion 1A, and 6A similarly denotes a fixing water pipe of the furnace main body 1. The blower pipe 6B on the side indicates a blower pipe attached to the peripheral portion 1A.
The cooling water pipe 5B and the ventilation pipe 6B attached to A
The outer tube 1A is connected to the outer tube by a detachable joint, so that the peripheral portion 1A can be easily opened and closed.

As another mode of the fixing means 3, the cotter means 3B is formed on both sides of the peripheral portion 1A, and the cotter 3b is pulled out and inserted into the engaging pin 3c to operate the cotter 3A. At the time of removal, for example, it may be suspended using a means such as a chain hoist and lowered to a predetermined position.

[0022]

According to the small cupola of the present invention, a part of the furnace main body (a part which is severely damaged by erosion) is divided into two parts.
By rotating or removing this part, the furnace body is opened, and the difficulty of repair, which was a problem with small furnaces having a small inner diameter, is eliminated. , Brick refilling) can be easily performed from the outside and efficiently using a tool such as a breaker. Therefore, even in a small furnace having a short repair cycle in which a temperature drop cannot be expected early, there is no need to perform repair work by putting the body inside at a high temperature, or
There is also an advantage that the problem of sucking dust due to razor in a narrow interior can be solved.

Other specific effects of the present invention are as described in detail in the above-described embodiments and examples of the present invention.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of a main part of a small cupola according to the present invention.

FIG. 2 is a cross-sectional view of a main part of the small cupola according to the present invention.

FIG. 3 is an enlarged partial cross-sectional plan view of a main part of the small cupola according to the present invention.

FIG. 4 is an enlarged side view of a main part of the small cupola according to the present invention.

FIG. 5 is an enlarged partial cross-sectional plan view of a main part of the small cupola according to the present invention.

FIG. 6 is an enlarged side view of a main part of the small cupola according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace main body 1A peripheral part 2 Melting zone 3 Fixing means 3A Hinge means 3B Cotter means 4 Refractory (brick) 4A Irregular refractory

Continued on the front page F term (reference) 4K045 AA02 BA02 GA06 4K051 AA03 AB03 BF03 MB03 MB05 MB11

Claims (4)

[Claims] 1. A small cupola having a refractory 4 stuck inside and having a melting capacity of about 5 t / hr or less, and a portion mainly including a melting zone 2 of the furnace main body 1 and around a longitudinal axis of the furnace main body 1. A predetermined circumferential portion 1A is configured to be openable and closable, a joining gap between the circumferential portion 1A and the furnace body 1 is filled with an irregular refractory 4A, and the circumferential portion 1A is A small cupola provided with fixing means 3 which is detachable. 2. The fixing means 3 comprises hinge means 3A provided on one side of the peripheral portion 1A and cotter means 3 provided on the other side.
B. The small cupola according to claim 1, wherein 3. The small cupola according to claim 1, wherein said fixing means comprises cotter means 3B provided on one side and the other side of said peripheral portion 1A. 4. The small cupola according to claim 1, wherein the peripheral portion 1A is at 180 degrees of the furnace body 1.