JPH081324A - Nozzle for removing fused slag - Google Patents

Abstract

PURPOSE:To surely perform the removing operation of fused slag without causing fin by tilting the spouting-out direction of fuel gas and oxygen from a slag removing nozzle at a fixed angle to the rear of a cast slab. CONSTITUTION:Respective ejectors 6, 7, 9 and 10 are provided with a gradient at a fixed angle theta to a rear 12a so that solvent oxygen spouting-out port 6, fuel gas spouting-out hole groups 7 and 10, and oxygen spouting-out hole group 9 for shield approach the rear 12a most on a side near an angle (d) with a slag removing nozzle 1 mounted directly on a manifold. It is desirable that the inclined angle theta of respective spouting-out ports 6, 7, 9 and 10 is in the range of approximately 10 deg. to 25 deg. to the rear 12a, and the best result is attained at theta = approximately 17 deg.. Also, for a distance between the removing nozzle 1 and a cast slab 12, approximately 50mm from the tip of the fuel spouting-out hole group 7 is proper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crater for removing fusing slag generated in gas cutting of a slab.

[0002]

2. Description of the Related Art In gas cutting of a thick slab produced by, for example, continuous casting, fusing slag is generated at the back edge of the slab that has been cut. That is, as shown in FIG. 5, when a flame 13 ′ is jetted from the cutting tip 13 to the cast piece 12 to perform gas cutting from the front side (upper side in the figure) of the cast piece 12, the back surface 12 a of the cast piece 12 is The fusing slag 14 is generated. Here, the adhesion state of the fusing slag 14 is about 10 mm in thickness and about 30 to 40 mm in width, and the corner (end edge) d is fixed to the back surface 12a as a root, and the portion apart from the corner d is It is relatively lightly attached to the back surface 12a.
In the figure, the part of the other party (right side in the figure) that has been cut is omitted.

If the fusing slag 14 is left unattended,
It has to be removed because it interferes with the process after cutting and causes defects such as rolling flaws and rolling roll flaws and reduces the manufacturing yield. Conventionally, the removal of the fusing slag 14 has been performed manually, but in recent years, as shown in FIG. 6, the removal craters 1 ′ are installed in parallel with the back surface 12 a, and the fusing slag 14 is removed by the injected flame. Has come to be used.

However, in this method, as shown in FIGS. 6 and 7, a part of the blown-out fusing slag 14 is finned (also referred to as a secondary burr) on a portion of the back surface 12a adjacent to the slag adhering portion. .) F, and they were attached again. Similar to the fusing slag 14, the fins f also have an adverse effect on the next process if left unattended.

Therefore, as shown in FIG. 8, the removal crater 1 is installed so as to be inclined with respect to the back surface 12a so as to be closest to the back surface at the corner portion d side, and the force of the flame hitting the fusing slag 14 is applied to the corner portion d. Fusing slag 1 while gradually decreasing with increasing distance from
A method of preventing the generation of the fin f by removing 4 has been considered.

[0006]

However, in order to set the removal crater 1'inclined, the removal crater 1'can be set.
A plurality of O-rings and the like for maintaining airtightness are attached between a head block for holding the air conditioner and a manifold (all not shown) arranged in parallel with the back surface 12a to which the head block is connected. It was necessary to insert a tilting block or the like.

Further, in order to keep the removal crater 1'in an appropriate position, fine adjustment is required, the number of parts is increased, and it takes a lot of time for handling and maintenance. Especially, since looseness between parts is likely to occur due to heat,
It was necessary to give sufficient consideration to the deterioration of position accuracy and gas leakage.

[0008]

DISCLOSURE OF THE INVENTION The present invention is a removal crater designed to solve this problem and remove fusing slag efficiently, such as a jet flow of fusing oxygen and a heating flame. The jet outlet and the jet hole group itself are inclined so that the jet flow direction is inclined at a constant angle in advance with respect to the installation direction of the removal crater.

That is, according to the present invention, a slit-shaped melt-cutting oxygen jet port and a heating fuel gas jet hole group located above the oxygen jet port and arranged in parallel with the above-mentioned melt-cutting oxygen jet port are provided. A lower block having, and a group of heating fuel gas ejection holes and a group of shielding oxygen ejection holes, which are located below the lower block with the lapping oxygen jet port interposed therebetween and are arranged in parallel with the lapping oxygen jet port, respectively. In the removal crater including the upper block having the above, it is previously selected as the above-mentioned melt-cutting oxygen jets, heating fuel gas jets, and shield oxygen jets, which were conventionally arranged in parallel with the back surface of the slab. The removal crater is easily and surely installed by giving the same inclination to the main body of the removal crater based on the optimum tilt angle.

[0010]

EXAMPLES Examples of the present invention will be described below with reference to FIGS. 1 and 2 are side views from one side and the other side, respectively, of a removal crater suitable for explaining the present invention. FIG. 3 is a front view of the removal crater shown in FIG.

Reference numeral 1 is a removal crater according to the present invention, reference numeral 2 is its head block, reference numeral 2'is a mounting portion to the manifold, and reference numeral 3 is an upper block firmly connected to the head block 2. The upper block 3 is also a lower block 4 that is also firmly connected to the head block 2,
Fix the end walls 5, 5'by sandwiching them on both sides,
As a result, between the end walls 5 and 5 ', a slit-shaped jetting oxygen jet port 6 is formed.

Reference numeral 7 denotes a fuel gas ejection hole group consisting of a plurality of holes which are arranged in parallel with the long sides of the burnishing oxygen ejection ports 6 and open into a recess 8 at the tip of the upper block 3. Also, reference numeral 9
Is a group of oxygen ejection holes for shield that are parallel to the fuel gas ejection hole group 7 and are arranged outside (downward) of the fuel gas ejection hole group 7 and open in the same recess 8. The direction of this shield oxygen ejection hole group 9 is inclined slightly upward toward the tip of the upper block 3,
As a result, the oxygen ejected from the shielding oxygen ejection hole group 9 merges with this flow at the other end while shielding the fuel gas ejection hole group 7 from the outside.

On the other hand, reference numeral 10 designates a group of fuel gas ejection holes which are arranged in parallel with the long sides of the melt-cutting oxygen ejection ports 6 and open in a recess 11 at the tip of the lower block 4. Reference numeral K denotes a flame when fuel gas, shield oxygen, and fusing oxygen are ejected from the fuel gas ejection hole groups 7, 10, the shielding oxygen ejection hole group 9, and the fusing oxygen ejection port 6, respectively. Indicates.

Further, in the case of the present invention, each of these ejection ports (hole group) 6, 7, 9, 10 has a burnt oxygen ejection port 6 and a fuel gas ejection port with the removal crater 1 mounted directly on the manifold. Hole groups 7 and 10 and shield oxygen ejection hole group 9
However, as shown in FIG. 4, the back surface 1 is closest to the corner d.
The rear surface 12a is provided so as to be inclined toward the rear surface 12a at a constant angle θ.

Here, each of the ejection ports (hole group) 6, 7,
The inclination angles θ of 9 and 10 are 10 ° to 2 with respect to the back surface 12a.
It is desirable to set it in the range of 5 °. As a result of various studies, θ
The best result is obtained at about = 17 °. Further, the distance L between the removal crater 1 and the cast slab 12 is appropriately about 50 mm from the tip of the fuel gas ejection hole group 7.

When removing the fusing slag 14,
First, the removal crater 1 is directly attached on the manifold. In this case, the removal crater 1 is tilted at a predetermined angle α (generally, the angle α is 30 °) along the corner d as shown in FIG. 1 so that the tip faces the back surface 12a.

Next, low-pressure oxygen is ejected from the melt-cutting oxygen ejection port 6 and fuel gas is ejected from the fuel gas ejection hole groups 7 and 10 to form a heating flame, and further, shielding oxygen is ejected from the shielding oxygen ejection hole group 9. Is spouted from the outside to start heating one end of the fusing slag 14 attached to the slab 12. After that, the pressure of the fusing oxygen is switched to a high pressure to form an appropriate flame K, and the removal crater 1 is moved along the adhesion surface of the fusing slag 14 to remove the fusing slag 14. In this case, the removal crater 1 is fixed, and the slab 12 is moved along the attachment direction of the fusing slag 14 to remove the fusing slag 14.
May be removed. In addition, the moving speed in this case is about 2 to 4 m / min, though it depends on the steel type.

As described above, the fusing slag 14 is strongly fixed at the corner d at the lower end of the cutting surface, and is relatively lightly attached at a portion apart from here and laterally spreading on the back surface 12a. However, in the removal crater 1 of the present invention, the flame that hits the fusing slag 14 is provided by inclining the fusing oxygen jet port 6, the fuel gas jet hole groups 7 and 10 and the shield oxygen jet hole group 9 at a constant angle θ. Is gradually reduced as the distance from the corner portion d increases, and the excessive flame force is reduced to prevent the fin f from being generated.

Therefore, in the removal crater 1 of the present invention, in order to give the removal crater 1 an inclination, it is not necessary to insert an inclination block or the like between the head block 2 and the manifold in consideration of airtightness. Therefore, the number of parts is small, and handling and maintenance are easy.
That is, when the removal crater 1 is used, just like the general removal crater 1 ′, the removal crater 1 itself is simply attached directly to the manifold to surely remove the fusing slag without the fins f. be able to.

The operation using the removal crater 1 is mainly performed when the cast slab is in a hot state, but it can also be applied in a cold state.

[0021]

As described above, in the removal crater of the present invention, the ejection directions of the fuel gas and oxygen are inclined at a constant angle θ with respect to the back surface of the slab, so that each ejection flow is different from the conventional one. Does not hit the fusing slag with an equivalent force, and there is no insertion of a tilting block or the like for giving a tilt to the removal crater, and the accompanying adjustments and defects during use.

That is, when this removal crater is used, as in the case of a general fusing crater, it is possible to surely remove the fusing slag without fins by simply attaching the crater itself directly on the manifold. The effect on work is great.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a partial cross-sectional view taken along the arrow I showing the entire removal crater.

FIG. 2 shows an embodiment of the present invention and is a side view along arrow II showing the entire removal crater.

FIG. 3 is an enlarged view of the removal crater shown in FIG. 1 along arrow III.

FIG. 4 is a schematic view showing a position of a removal crater of the present invention with respect to a steel slab.

FIG. 5 is an explanatory diagram of gas cutting of a slab.

FIG. 6 is a schematic view showing a position of a conventional removal crater with respect to a steel piece.

FIG. 7 is a plan view taken along the arrow VII showing the fin formation state on the back surface of the steel slab.

FIG. 8 is a schematic diagram showing a position with respect to a steel piece when a conventional removal crater is inclined.

[Explanation of symbols]

 1,1 'Removal crater 3 Upper block 4 Lower block 5,5' End wall 6 Welding oxygen jet nozzles 7,10 Fuel gas jet nozzle group 9 Shield oxygen jet nozzle group 12 Steel piece 12a Back surface 14 Welding slag d Corner part f fin K flame

Front page continued (72) Inventor Masao Takanaka 11-1 Showa-machi, Kure-shi, Hiroshima Nisshin Steel Co., Ltd. (72) Inventor Katsuyoshi Ishimura 11-11 Showa-machi, Kure-shi, Hiroshima Nisshin Steel Co., Ltd. Company Kure Steel Works (72) Inventor Tetsuya Fujimoto 11-11 Showa-cho, Kure City, Hiroshima Prefecture Nisshin Steel Co., Ltd. Kure Works

Claims (2)

[Claims] 1. A removal crater which is mounted on a manifold and which removes the slag by injecting a flame toward a fusing slag formed on the back edge of the slab as the slab melts The cutting oxygen jet outlet, a lower block located above the oxygen jet outlet and having a group of fuel gas jet holes for heating arranged in parallel with the oxygen jet jet, and the welding oxygen jet outlet. An upper block having a heating fuel gas ejection hole group and a shielding oxygen ejection hole group, which are located below the lower block and sandwiched therebetween, and which are arranged in parallel with the fusing oxygen ejection holes, respectively. The oxygen ejection port, each fuel gas ejection hole group, and the shield oxygen ejection hole group are arranged so that the removal crater is directly mounted on the manifold so as to come closest to the back surface on the edge side. back Removal crater fusing slag, characterized in that is provided obliquely at a certain angle to. 2. The angle is 10 ° to 2 with respect to the back surface.
The crater for removing fusing slag according to claim 1, wherein the crater is 5 °.