JP2557237Y2 - Crater for heating - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating crater used for removing slag in a cylinder and heating a cylinder or a hexagonal cylinder.

[0002]

2. Description of the Related Art In continuous casting, a long nozzle serving as a pouring passage has a cylindrical shape, but each time one operation is completed, the long nozzle has an inner diameter of about 100 to 150 mm. It is necessary to remove the slag attached to the inner part (FIG. 3). Conventionally, this operation has been manually performed by an operator by operating an oxygen lance, but is a severe operation under high heat. Recently, a mechanical processing method has been considered, but the mechanism is complicated, expensive, and difficult to handle. Further, in the heating operation of a cylinder, a hexagonal cylinder, or the like, a ring-shaped perforated heating crater, which is troublesome to manufacture, or a plurality of single heating craters are arranged side by side on the circumference to heat.

In consideration of these points, the present invention is effective for removing slag in a cylinder and for heating a cylindrical member such as a cylinder or a hexagonal cylinder by using only a single heating crater. It was devised as follows.

[0004]

That is, the gist of the present invention consists of a core rod, a crater main body and a cover, wherein the crater main body has a base having a hitting portion, and an inner portion screwed and fixed to the base. A cylindrical body and an outer cylindrical body, a flammable gas ejection hole is formed at a tip side between the inner and outer cylinders, and an outer oxygen ejection hole and an inner combustion support hole sandwiching the flammable gas ejection hole. Oxygen jet holes are drilled, and flammable gas jet angles θ ₁ = 6 ° to 14 ° and outer oxygen jet angles θ ₂ = 5 ° to 13 °. And a flammable gas are mixed to form a broadened heating flame, and further, auxiliary oxygen is spouted from the inside of the heating flame to the heating crater.

[0005]

In the heating crater of the present invention, a heating flame is blown out from a single heating crater located at the upper center of the heating crater at a certain distance from the standing long nozzle (FIG. 3). The flame heats the slag attached to the inner wall of the long nozzle, melts it, flows it downward, and cleans it. In addition, even when heating a cylinder, a hexagonal cylinder, or the like, the end of the heating flame is installed as shown in FIG. It can be heated.

[0006]

FIG. 1 shows an embodiment of a heating crater according to the present invention.
4 to FIG. Reference numeral 1 denotes a crater main body of the crater, a base 2 having a contact portion which is in contact with a corresponding blow pipe at a tapered surface, an inner cylindrical body 3 screwed and fixed to the base 2, and
Similarly, the outer cylindrical body 4 is used.

A core rod 5 is inserted into the inner hole of the crater main body 1, is in contact with the inner cylindrical body 3 at the tip end side, and is fixed to the base 2 by a set screw 6 at the head. The inner oxygen passage 7 is formed between the inner hole of the crater main body 1 and the inner hole. The set screw 6 has a lateral groove 6a for fixing the core rod.

Reference numeral 8 denotes a cover, which has a screw 10 for wrapping around the outside of the crater main body 1 and in contact with the outer cylindrical body 4 and for pushing up the nine surfaces of the base 2 to fix it to the corresponding blowpipe.
The inner surface of the cover 8 forms an oxygen through hole 11 with the outer tubular body 4.

Reference numeral 2a denotes a plurality of small holes which communicate with the through holes 7 formed in the first peripheral groove of the tapered surface of the crater main body.
Are a plurality of small holes which communicate with the through holes 12 between the inner and outer cylindrical bodies also formed in the second peripheral groove of the tapered surface. 2c is a plurality of small holes communicating with the through holes 11 formed in the third circumferential groove. Reference numeral 13 denotes a tip of the core rod 5 and the inner cylindrical body 3.
It has a slit portion having a plurality of vertical grooves engraved at a portion in contact with the slit.

[0010] As shown in FIG.
And recessed inwardly to have a distance h ₁ between the front end surface of the, also, the tip end surface of the inner cylindrical body 3 has a slightly inclined surface toward the outer periphery, between the front end surface of the outer tubular member 4 Has an interval h ₂ , but h ₂ = 0 may be sufficient in some cases.

Reference numeral 14 denotes a plurality of flammable gas through holes formed on the outer peripheral side of the distal end portion of the inner cylindrical body 3, and has an outward inclination angle of θ ₁ = 6 ° to 14 °. have. If the inclination angle is less than the lower limit of 6 °, there is a disadvantage that the heating range for the object is narrowed.If the inclination angle exceeds the upper limit of 14 °, there is a problem that the effect of the auxiliary oxygen is weakened.
The above range was set.

Reference numeral 15 denotes a distal end portion of the outer cylindrical body 4.
It extends outward and has a plurality of vertical grooves 15a with its leading end portion serving as a convex portion. An oxygen passage is formed between this externally inclined surface and the inclined surface 16 on the cover side parallel thereto. I have. The outward inclination angle is θ ₂ = 5 ° to 13 °,
Increase or decrease of the angle is approximately proportional to the increase or decrease of theta _1. Here, a vertical groove is formed on the inclined surface 15 side, but it may be provided on the cover 8 side. Further, although the oxygen passage is formed in a slit type with a vertical narrow, it may be formed in a so-called jagged type with a thin ring-shaped gap. The space portion 17 formed by the above h ₁ and h ₂ becomes a mixer portion for forcibly mixing first in this portion when the oxygen and the flammable gas are ejected. In the figure, 3a,
Reference numeral 4a denotes a plurality of protrusions provided in each passage for suppressing the pulsation of the combustible gas and oxygen.

Referring now to FIG. 3, reference numeral 20 denotes a long nozzle which is one of the objects, 21 denotes an attached slag,
Reference numeral 22 denotes a heating crater of the present invention, reference numeral 23 denotes a blowpipe to which the crater is attached, reference numeral 24 denotes a holder of the blowpipe, and reference numeral 25 denotes a heating flame by oxygen and combustible gas ejected from the heating crater 22.

When the heating crater of the present invention is operated, the combustible gas passing through the through holes 2b, 12, 14 and the through holes 2c, 1
Oxygen that has passed through 1 and 15a spreads outward at jetting angles of θ ₁ and θ ₂ , respectively, and is jetted out, and is forcibly mixed in the mixing section 17 and thereafter, and the heating flame heats the slag of the long nozzle. Then, the slag melts and flows down, and the inner surface is cleaned. In general, since the crater for heating uses a large flow rate of the oxygen flammable gas, the crater itself is likely to be heated and the flashback easily occurs because the crater itself is liable to be heated. It is mixed outside the crater (out-mixing) for safety.

On the other hand, the inner oxygen flow ejected from the through holes 2a, 7 and the slit groove 13 serves as an auxiliary fire by supplying oxygen from the inside to the burning heating flame, thereby reducing the length of the flame. Extend. The jet angle is parallel to the flow, but may be 1 to 3 degrees as required.

The positional relationship between the long nozzle and the heating crater depends on the spread of the heating flame.
For a long nozzle of about 0 mm, the distance B is 100 to
About 150mm is appropriate. The heating of the cylinder and the hexagonal cylinder is set at the position as shown in FIG. 4, and the entire cylindrical body 20 'can be efficiently heated by ejecting the heating flame from the circumferential end face.

In addition to using the heating crater fixed as shown in FIGS. 3 and 4, the heating range is enlarged by moving the blowing pipe tip on the holder so as to draw a small ring. It is also effective for craters that have a tendency to bias the flame of the heating flame.

[0018]

[Effect of the Invention] Since the heating crater has the above-described structure, slag removal of a long nozzle or the like can be easily performed without using a complicated mechanism without manual work as in the related art. . Also, when heating the end face of a cylinder or hexagonal cylinder, etc., by setting the size and ejection angle of the crater so as to conform to the inner diameter and outer diameter dimensions, a crater or a plurality of craters that are difficult to process as in the past Since the desired operation can be easily performed without the disadvantage of the above, the industrial profit can be said to be extremely large.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a heating crater of the present invention.

FIG. 2 is a plan view of the heating crater of the present invention as viewed from the front end thereof.

FIG. 3 is a sectional view showing a use state of the present invention.

FIG. 4 is a sectional view showing another example of a use state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crate main body 2 Base 3 Inner cylindrical body 4 External cylindrical body 5 Core rod 6 Set screw 7, 11 Oxygen through hole 8 Cover 12.14 Combustible gas through hole 13 Slit 15 Slope

Claims (1)

(57) [Scope of request for utility model registration] 1. A crater body comprising a core rod, a crater body and a cover, wherein the crater body comprises a base having a contact portion, and an inner cylindrical body and an outer cylindrical body screwed and fixed to the base. A flammable gas ejection hole is formed at the tip end between the bodies, an outer oxygen ejection hole and an inner combustion assisting oxygen ejection hole are formed with the flammable gas ejection hole interposed therebetween, and the respective flammable gas ejection angles are provided. Provided outward in the range of θ ₁ = 6 ° to 14 ° and the outer oxygen ejection angle θ ₂ = 5 ° to 13 °, and mixed with oxygen and combustible gas at the tip of the crater to form a divergent heating flame A heating crater, wherein oxygen for assisting combustion is jetted from the inside to the heating flame.