JP6826142B2 - Lance pipe - Google Patents

Description

The present invention relates to a lance pipe.

In the refining process of steelworks, lance pipes are used to blow stirring gas and various treatment agents into hot metal and molten steel. As shown in FIG. 1 of Patent Document 1, the lance pipe for refining is connected to the lance holder by bolting the flange at the upper end of the core metal which serves as a passage for the stirring gas and various treatment agents. The lance pipe is suspended from an injection lance device and immersed in hot metal or molten steel. Further, the lance pipe is provided with reinforcing ribs for reinforcing the joint portion between the core metal of the lance pipe and the flange.

Japanese Unexamined Patent Publication No. 2011-208190

However, the lance pipe vibrates violently due to the reaction of blowing a stirring gas or the like into the hot metal or molten steel, or by the stirring flow of the hot metal or the like. Therefore, as shown in FIG. 10, the tip 113a of the reinforcing rib 113 of the lance pipe 110 serves as a fulcrum of the vibration of the lance pipe 110, and the core metal 112 of the lance pipe is subjected to concentrated stress. Further, the influence of the buoyancy received from the hot metal or the like also further promotes the concentration of stress on the portion where the core metal 112 and the tip 113a of the reinforcing rib 113 are joined. Therefore, there is a problem that the core metal 112 is easily broken at the portion A near the tip 113a of the reinforcing rib 113.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a lance pipe capable of preventing breakage of a core metal.

In order to solve the above problems, the lance pipe according to the present invention is attached to a core metal having a spout formed at one end, a flange provided at the other end of the core metal, and a joint portion between the core metal and the flange. A non-fixed region that is not fixed to the core metal is provided at the outlet side end of the at least one reinforcing rib.

Further, a gap may be provided between the non-fixed region of the reinforcing rib of the lance pipe according to the present invention and the outer circumference of the core metal, and this gap may be 0.005 mm to 2 mm.
Further, more preferably, the gap between the non-fixed region of the reinforcing rib and the outer circumference of the core metal may be 0.005 mm to 1 mm.

Further, the reinforcing rib has a fixing region fixed to the core metal, and the fixing region of the reinforcing rib may be 50% to 95% of the total length of the reinforcing rib.
Further, more preferably, the fixing region of the reinforcing rib may be 75% to 90% of the total length of the reinforcing rib.

According to the lance pipe according to the present invention, breakage of the core metal can be prevented.

It is a figure which shows the use example of the lance pipe which concerns on embodiment of this invention. It is sectional drawing which shows the whole structure of the lance pipe shown in FIG. FIG. 5 is an enlarged side view showing a portion of the lance pipe shown in FIG. 2 in which the first reinforcing rib and the second reinforcing rib are provided. FIG. 3 is an enlarged top view showing a portion of the lance pipe shown in FIG. 2 in which the first reinforcing rib and the second reinforcing rib are provided. It is sectional drawing which shows the shape which cut the lance pipe shown in FIG. 2 by a cutting line VV. It is sectional drawing which shows the shape which cut the lance pipe shown in FIG. 2 by a cutting line VI-VI. 7 (a) to 7 (e) are enlarged views showing the shape of the first reinforcing rib of the lance pipe according to another embodiment of the present invention. 8 (a) and 8 (b) are enlarged views showing the arrangement of reinforcing ribs of the lance pipe according to another embodiment of the present invention. It is a figure which shows the use example of the lance pipe which concerns on another embodiment of this invention. It is a side view which showed the part where the reinforcing rib of the lance pipe which concerns on the conventional example is provided.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, an example in which the lance pipe 10 is used in the torpedo wagon 1 will be described with reference to FIG.
The lance pipe 10 is inserted into the hot metal 5 in the torpedo wagon 1 and immersed. The lance pipe 10 is attached to the lance holder 20 by bolting via a flange 11 provided at the upper end. Further, the elevating rail 21 is attached to the lance holder 20. Therefore, the position of the lance pipe 10 in the torpedo wagon 1 can be adjusted by the elevating rail 21. The lance pipe 10 blows a stirring gas into the hot metal 5, and vibrates mainly in the vibration direction V due to the reaction of the blowing and the buoyancy from the hot metal 5.
What the lance pipe 10 blows into the hot metal 5 is not limited to the stirring gas, and may be various treatment agents.

Next, the detailed structure of the lance pipe 10 will be described with reference to FIGS. 2 to 6.
As shown in FIG. 2, the lance pipe 10 has a tubular core metal 12. Stirring gas flows inside the core metal 12. At one end of the core metal 12, a spout 12a for blowing out a stirring gas is formed. The end of the core metal 12 on the spout 12a side is bent. A flange 11 is provided at the other end of the core metal 12. Further, the portion of the core metal 12 that is immersed in the hot metal 5 is covered with the refractory material 14.
In the following description, the side where the spout 12a is provided is the lower side and the side where the flange 11 is provided is the upper side with respect to the core metal 12.

As shown in FIGS. 2 to 5, a pair of first reinforcing ribs 13a and a pair of second reinforcing ribs 13b are provided adjacent to the flange 11 at the joint portion between the flange 11 and the core metal 12. Here, as shown in FIG. 5, each of the pair of first reinforcing ribs 13a and the pair of second reinforcing ribs 13b are attached so as to project outward in the radial direction with respect to the outer circumference of the core metal 12. .. Further, as shown in FIGS. 3 and 4, the first reinforcing rib 13a and the second reinforcing rib 13b are provided orthogonal to the flange 11. Further, each of the first reinforcing rib 13a and the second reinforcing rib 13b is a substantially triangular plate material that becomes thinner toward the lower side. The length of the first reinforcing rib 13a in the longitudinal direction is 280 mm. On the other hand, the length of the second reinforcing rib 13b in the longitudinal direction is 250 mm. Therefore, the lower end 13aa of the first reinforcing rib 13a protrudes 30 mm downward from the lower end 13ba of the second reinforcing rib 13b. The lower end 13aa of the first reinforcing rib 13a is located above the upper end 14a of the refractory 14 that covers the core metal 12.

Further, as shown in FIG. 5, the pair of first reinforcing ribs 13a are provided at positions different from each other by 180 ° on the outer circumference of the core metal 12. The pair of first reinforcing ribs 13a are arranged along the vibration direction V of the lance pipe 10. Further, the pair of second reinforcing ribs 13b are also provided at positions different from each other by 180 ° on the outer circumference of the core metal 12. The first reinforcing ribs 13a and the second reinforcing ribs 13b are respectively displaced at intervals of 90 ° and are alternately arranged on the outer periphery of the core metal 12.

As shown in FIGS. 3 and 4, a portion near the lower end 13aa of the first reinforcing rib 13a, that is, a portion protruding downward with respect to the lower end 13ba of the second reinforcing rib 13b is directly on the outer circumference of the core metal 12. Not fixed. Here, the portion where the first reinforcing rib 13a is directly fixed to the outer periphery of the core metal 12 by welding is defined as the fixing region X1 of the first reinforcing rib 13a. Further, a portion near the lower end 13aa of the first reinforcing rib 13a, which is not directly fixed to the outer periphery of the core metal 12 by welding, is designated as a non-fixed region X2 of the first reinforcing rib 13a. Here, the length of the non-fixed region X2 of the first reinforcing rib 13a is 30 mm.
The second reinforcing rib 13b is welded to the outer periphery of the core metal 12 over almost the entire length.

As shown in FIGS. 3 to 5, a fillet welded portion 15 is formed at a joint portion between the fixed region X1 of the first reinforcing rib 13a and the core metal 12. Further, a fillet welded portion 15 is similarly formed at the joint portion between the second reinforcing rib 13b and the core metal 12. Here, the fixed region X1 of the first reinforcing rib 13a occupies about 90% of the total length of the first reinforcing rib 13a.

Further, as shown in FIGS. 3 and 6, a gap G is provided between the non-fixed region X2 of the first reinforcing rib 13a and the outer circumference of the core metal 12. The gap G between the non-fixed region X2 of the first reinforcing rib 13a and the core metal 12 is 0.1 mm. In this embodiment, the first reinforcing rib 13a is welded only in the range of the fixed region X1 with the first reinforcing rib 13a floating 0.1 mm from the core metal 12. Although omitted in FIG. 6, in the range of the fixed region X1, a part of the first reinforcing rib 13a and the core metal 12 is solidified after being melted into the fillet welded portion 15, and the fillet welded portion 15 and Strictly speaking, the boundary with the first reinforcing rib 13a penetrates into the steel material of the first reinforcing rib 13a before welding.

From the above, in the lance pipe 10 according to this embodiment, the non-fixed region X2 is provided in the vicinity of the lower end 13aa of the first reinforcing rib 13a among the first reinforcing rib 13a and the second reinforcing rib 13b. As a result, in the core metal 12, the stress to be applied to the vicinity of the lower end 13aa of the first reinforcing rib 13a is dispersed. That is, even when the lance pipe 10 vibrates significantly, the non-fixed region X2 of the first reinforcing rib 13a and the core metal 12 are not directly constrained to each other in the longitudinal direction of the lance pipe 10, so that the lower end of the first reinforcing rib 13a It is possible to prevent the 13aa from becoming a fulcrum of vibration and concentrating stress on a specific portion of the core metal 12. Moreover, since the non-fixed region X2 of the first reinforcing rib 13a limits the vibration of the core metal 12, it is applied to the welded end of the fixed region X1 at the boundary between the fixed region X1 and the non-fixed region X2 of the first reinforcing rib 13a. The stress due to vibration is also reduced as compared with the case where there is no non-fixed region X2.
Further, in general, residual stress may be generated in a welded portion such as the fixed region X1 due to expansion and contraction due to thermal history during welding, and a plate is formed at a welded portion at an end portion of a plate-shaped member such as a rib. Unlike the welded portion on the side surface of the shaped member, the weld metal tends to melt into the end face side by being heated from the end face side, so that the residual stress may be particularly large. On the other hand, at the welded end of the fixed region X1 at the boundary between the fixed region X1 and the non-fixed region X2 of the first reinforcing rib 13a, the non-fixed region X2 is present at the time of welding, so that heating from the end face or welding metal Since the penetration of the metal is prevented, an increase in residual stress is prevented.
Therefore, it is possible to prevent the core metal 12 of the lance pipe 10 from being broken or damaged.
Further, since the first reinforcing rib 13a and the second reinforcing rib 13b are provided at the joint portion between the core metal 12 and the flange 11, the effect of suppressing the vibration of the lance pipe 10 can be obtained.
Further, since the gap G is provided between the non-fixed region X2 and the outer circumference of the core metal 12, the lower end 13aa of the first reinforcing rib 13a becomes a fulcrum of vibration, and a specific portion of the core metal 12 is provided. It is prevented that stress is concentrated on the surface.

Further, in this embodiment, the gap G between the non-fixed region X2 of the first reinforcing rib 13a and the core metal 12 is 0.1 mm, but the gap G is not limited to this, and the gap G is more preferably 2 mm or less. May have a length in the range of 0.005 to 2 mm. That is, when the gap G exceeds 2 mm, the effect of the first reinforcing rib 13a in suppressing the vibration of the lance pipe 10 is reduced, and the non-fixed region X2 of the first reinforcing rib 13a is a coolant during fillet welding. Therefore, the effect of reducing the residual stress in the vicinity of the welded end tends to decrease. Further, when the gap G is 0.005 mm or more, the stress intensively applied to the core metal 12 can be sufficiently dispersed in the vicinity of the lower end 13aa of the first reinforcing rib 13a. A more preferable range for the gap G is a range of 0.005 to 1 mm. When the gap G is within the range of 0.005 to 1 mm, the first reinforcing rib 13a more effectively suppresses the vibration of the lance pipe 10, and the stress applied to the core metal 12 is sufficiently dispersed. ..

Further, in this embodiment, the fixing region X1 of the first reinforcing rib 13a is about 90% of the total length of the first reinforcing rib 13a, but is not limited to this, and the fixing region X1 of the first reinforcing rib 13a is fixed. The region X1 may occupy 50 to 95% of the total length of the first reinforcing rib 13a. That is, when the length of the fixed region X1 is shorter than 50% of the total length of the first reinforcing rib 13a, the effect of the first reinforcing rib 13a suppressing the vibration of the lance pipe 10 is reduced. Further, when the length of the fixed region X1 is longer than 95% of the total length of the first reinforcing rib 13a, the stress applied to the core metal 12 cannot be sufficiently dispersed near the lower end 13aa of the first reinforcing rib 13a. .. A more preferable range for the length of the fixed region X1 is a range of 75 to 90%. Since the length of the fixed region X1 is 75 to 90% of the total length of the first reinforcing rib 13a, the first reinforcing rib 13a more effectively suppresses the vibration of the lance pipe 10 and forms the core metal 12. Such stress is also sufficiently dispersed.
Further, the length of the non-fixed region X2 is more preferably equal to or larger than the width of the fillet welded portion 15 (the maximum diameter of the right-angled triangular cross-sectional shape of the fillet welded portion 15) in order to reduce the residual stress due to welding. Is preferably twice the width of the fillet welded portion 15, and is preferably 15 mm or more, more preferably 30 mm or more.

Further, not limited to this embodiment, as shown in FIG. 7A, a spacer 16 is provided between the fixed region X1 of the first reinforcing rib 13a and the core metal 12, and the first reinforcing rib 13a is not fixed. It is also possible to more reliably secure the gap G between the region X2 and the core metal 12.

Further, as shown in FIGS. 7 (b) to 7 (e), a notch is provided in the non-fixed region X2 in order to secure a gap G between the non-fixed region X2 of the first reinforcing rib 13a and the core metal 12. A part may be provided.
Specifically, as shown in FIG. 7B, the non-fixed region X2 of the first reinforcing rib 13a is cut out parallel to the longitudinal direction of the core metal 12 to form a rectangular cutout portion 23. You may. Further, as shown in FIG. 7 (c), the non-fixed region X2 of the first reinforcing rib 13a is cut out obliquely with respect to the longitudinal direction of the core metal 12 to form a triangular cutout portion 33. May be good. Further, as shown in FIG. 7D, the non-fixed region X2 of the first reinforcing rib 13a may be diagonally cut out in a curved arch shape to form the cutout portion 43. Further, as shown in FIG. 7 (e), the non-fixed region X2 of the first reinforcing rib 13a may be cut out in a stepped manner to form the cutout portion 53.
In FIGS. 7 (c) to 7 (e), the gap G between the non-fixed region X2 of the first reinforcing rib 13a and the core metal 12 has a length in the range of 0.005 to 2 mm over the entire length of the non-fixed region X2. Goodbye.
In FIGS. 7 (b) to 7 (e), the start points 23a, 33a, 43a, 53a of the cutout portions 23, 33, 43, 53 are provided in the welded fixed region X1.

Further, as shown in FIGS. 8A and 8B, even if all of the four reinforcing ribs attached to the core metal 12 are provided with a gap G between the non-fixed region X2 and the core metal 12. Good. Each of the four reinforcing ribs 63 shown in FIG. 8A is arranged at a position deviated by θ1 = 45 ° with respect to the vibration direction V of the lance pipe 10. Further, each of the four reinforcing ribs 73 shown in FIG. 8B is arranged at a position deviated by θ2 = 30 ° with respect to the vibration direction V of the lance pipe 10. That is, even if the mounting bolts, pipes, etc. of the flange 11 are provided at the positions corresponding to the vibration direction V of the lance pipe 10, the reinforcement having a gap G within 45 ° with respect to the vibration direction V is provided. By arranging the ribs, the effect of stress distribution can be sufficiently obtained.

Further, as in the usage example shown in FIG. 9, the lance pipe 70 according to another embodiment is inserted into the hot metal 5 in the ladle 71 and immersed. The lance pipe 70 has a linear shape, and agitated gas is ejected outward in the radial direction through the ejection port 72 at the tip portion. Since the lance pipe 70 may vibrate in all directions, it is desirable to install reinforcing ribs having a gap G between the lance pipe 70 and the core metal at equal intervals over the entire circumference of the lance pipe 110.

10,70 Lance pipe, 11 flange, 12 core metal, 12a spout, 13a first reinforcing rib, 13b second reinforcing rib, G gap, X1 fixed area, X2 non-fixed area.

Claims (5)

A core metal with a spout formed at one end,
A flange provided at the other end of the core metal and
It is provided with at least one reinforcing rib attached to the joint portion between the core metal and the flange.
A lance pipe provided with a non-fixed region that is not fixed to the core metal at the end of at least one reinforcing rib on the spout side. The lance pipe according to claim 1, wherein a gap is provided between the non-fixed region of the reinforcing rib and the outer periphery of the core metal, and the gap is 0.005 mm to 2 mm. The lance pipe according to claim 2, wherein the gap between the non-fixed region of the reinforcing rib and the outer circumference of the core metal is 0.005 mm to 1 mm. Any of claims 1 to 3, wherein the reinforcing rib has a fixed region fixed to the core metal, and the fixed region of the reinforcing rib occupies 50% to 95% of the total length of the reinforcing rib. The lance pipe described in item 1. The lance pipe according to claim 4, wherein the fixed region of the reinforcing rib occupies 75% to 90% of the total length of the reinforcing rib.

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