JPS6286104A - Slag pot - Google Patents

Abstract

PURPOSE:To prevent the deformation of ribs by thermal stress during long-term use by juxtaposing a pair of the ribs to the lower side of a housing groove for a tilting pin supporting part, fixing and uniting the same to the entire length of the bottom surface of the supporting part and specifying the projection length of the ribs. CONSTITUTION:The anchor-shaped tilting pin supporting part 3 is projected to the lower side of a trunion shaft 2 provided to a main body 1 of a slag pot to form the housing groove 4 for the tilting pin to the top surface side of the supporting part 3. A pair of the flat plate-shaped ribs 5 are juxtaposed to the bottom surface side of the horizontal plate-shaped projection 3a of the supporting part positioned below the housing groove 4 and the inside end faces thereof are integrally fixed from the bottom surface at the base end of the projection 3a of the main body 1 to the outside peripheral end in the bottom plate part of the body 1. The top end face thereof is fixed over the entire length of the bottom surface of the projection 3a. The projection length at the bottom end of the ribs projecting from the angle part in the bottom plate part 6 of the main body 1 is sized at 20-40% of the outside diameter of the bottom plate part 6. The outside end face of the ribs at the angle in the angle part at the top end of the bottom surface of the projection 3a from the top end at the bottom end of the ribs 5 is formed to a linear face.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is applicable to molten pig iron in steel plants, molten slag waste generated in the /8 steel processing process, or /8 steel ladle bottoms in ingot making and continuous casting factories. This relates to a cast steel container, that is, a slag pot, which stores the molten slag waste remaining in the slag, cools it, and then transports it to a treatment plant.

(Prior Art) As shown in Figs. 7 to 10, the conventional slug pot has a front anchor-shaped tilting pin support portion (3) protruding from the lower steel shell of the trunnion shaft (2) on the lower surface side. In the middle part -
It has a structure in which hanging ring pieces 15 for reversing the slag pot are disposed at certain locations.

(Problem to be Solved by the Invention) When molten slag is injected into such a slag pot with the molten ground fully bent, the temperature at the bottom rises rapidly and the temperature difference with the upper part of the pot causes significant thermal stress. occurs, the bottom expands, and the outer periphery of the lower end of the iron skin swells outward, resulting in a considerably thicker diameter.

Now, the temperature of the bottom of the pot rises from t to t, and the bottom diameter d becomes d.
If the expansion diameter becomes d = d (1 + α (1 - 1)) (where α is the expansion coefficient of steel), then the following formula holds true: In a normal slag pot, the expansion size is d = 150 mm. will also be reached.

On the other hand, since the expansion decreases toward the upper shell of the slag pot, significant bending stress is generated in the steel shell around the tilting pin support part (3), as shown in FIGS. 9 and 10. As shown in Fig. 7.8, the shape results in a state where the slag pot digs into the inside, and this state remains due to plastic deformation of the slag pot during the cooling process.

This residual amount is accumulated over a long period of repeated use, and the amount of biting deformation increases approximately in proportion to the number of times of use.

Therefore, in the conventional slug pot, the normal level (al) of the tilting pin support part (3) is displaced upward by the inclination angle (bl) as shown in FIG. The dimensions were significantly lower than the original value, and the product became unusable due to the inability to support tilting.It was necessary to either scrap it and make a new one, or to undergo major repairs, which required considerable expense and construction time. .

The present invention solves the drawbacks and problems of the conventional slag pot and provides a slag pot having a structure most suitable for long life.

(Means for Solving the Problem) As shown in the drawings corresponding to the embodiments, the slag pot of the present invention has an anchor-shaped tilting pin supported below a trunnion shaft (2) provided in the slag pot main body ( ). The tilting pin is stored on both sides of the upper surface of the tilting pin support part (3). 6 (4) (4) In the slug pot formed with
(4) (4) A pair of ribs (5) (5) are arranged in parallel below (4), and the upper end surface of these ribs (5) (5) is attached to the tilting pin support (3). The length of the ribs (5) (5) protruding from the bottom of the slag pot body (1) is fixed to the entire length of the bottom surface of the slag pot body (1).
It is characterized by being formed to a dimension that is 20 to 40% of the bottom diameter of (1), and is configured to prevent inward deformation due to thermal stress by these ribs (5) (5). It is.

(Function of the invention) In other words, in order to prevent the slag pot from biting and deforming due to thermal stress, it is not necessary to simply increase the cross-sectional area as a strength amplifier (in other words, it is necessary to increase the cross-sectional area of the pot bottom plate where the lowest temperature part has the maximum expansion). Ribs (5) (5) are protruded from the outside on the extension line of the bottom plate, and the distance from the center of the bottom plate is as large as possible.These ribs (5) (5) allow the iron skin of the pot to This prevents it from digging in and deforming.

This kind of technical idea is completely different from the idea of reinforcing brackets as compression members that simply support shelf boards from the back side. It was created based on the equivalent transformation theory, which is similar to the function of reinforcing bars in reinforced concrete structures that compensate for the toughness of reinforcing bars, or the function of concrete that protects reinforcing bars from thermal expansion without following it.

That is, the rib f5) (5) is integrated with the tilting pin support part (3) and is connected to the vicinity of the upper trunnion shaft (2) where the temperature does not rise much through the anchor-shaped support part (3). In this way, the left and right four ribs (
5) In (5), we purposely adopted a structure that does not connect and integrate the bottom part on the outermost side, where the temperature rise is very small, because it was necessary to make the slag pot as compact as possible and to have a function to suppress weight increase. be.

This is because the slag pot is permanently installed, but the molten waste and some molten metal are poured into this slag pot, and 2 to 4
When the predetermined amount is reached by charging, the slag pot is transported by a dump truck equipped with a dedicated tilting cargo handling device, and lifted by supporting the left and right trunnion shafts (2) of the slag pot with the arcuate claws at the ends of the two levers at the processing plant. The slag pot is tilted by a hydraulic link and a lever mechanism, and the tilting pin is inserted into the groove (4) of the support part (3) to discharge the molten metal while supporting it. This is because it is necessary to make the difference between the total weight of the slag pot and the total weight of the slag pot as large as possible.

Furthermore, in the present invention, these ribs f5) +5
) are provided in pairs on the lower surface of the support portion (3), and the technical basis thereof will be explained based on FIG.

In the figure, the thermal expansion of the bottom plate part (6) of the slag pot main body (1), which has the highest temperature, is radial from the bottom plate center O, that is, in the tilting pin support part (3), the thermal expansion is at the base end P of the rib (5). occurs in the direction of P as shown by the straight line OP,
Restrained by the rib (5), the reaction force is applied to the bottom plate (6)
acts in the direction from point P to Q parallel to the line OT connecting the center 0 of and the center between the ribs (5) (5), so its vector OQ becomes 0Q=sin cxOP, and similarly, the vector OQ of the other rib ( 5) A reaction force due to thermal expansion also acts on the base point S, and its vector 0R (R is the intersection of a line parallel to the straight line OT passing through point S and a line passing through the center 0 perpendicular to this) is 0R=sin βO8. However, both ribs (5) (5) and the center line O
Since they are parallel and symmetrical to T, op=os, α-β, and therefore OQ and OR are equal and cancel each other out, and these ribs (5) are integrated with the support (3).
In (5), no rotational deformation occurs at all.

Next, the present inventors discovered that the rib (5) (
It was found that the protrusion dimension of 5) has a correlation with the diameter of the bottom plate part (6), and it was possible to set the protrusion dimension of the rib (5) (5) necessary for a long-life slag pot with little thermal deformation. Ta.

That is, the diameter of the bottom plate part (6) of the slag pot main body (1) is D.
mm, and the protruding dimension of the ribs (5) (5) is L mm, then L = cD (c is a constant), and in the relationship, change the value of the constant C from 0.10 to 0°40 in 0.05 increments. Change the volume to 9IT? The rib protrusion dimension of a slag pot with a dead weight of 7 tons and a bottom outer diameter of 1700 mm was determined and tested, and the data shown in the following table was obtained.

Dimensions Test Results Usability cDL
Biting deformation Rib maximum temperature Rating 0.10170017
0 extremely large 650℃ ×××0.15
Large 5801・XX0.20～
Slightly large 500 = 00.25
〃 None 430〃 O0,3
0〃 None 350〃 O0,3
5〃 None 280〃 O0,4
0〃 None 200〃 ◎As is clear from the table above, the protruding length of the ribs (5) (5) may be 0.20 to 0.40% of the diameter of the bottom plate.

Next, examples of the present invention will be shown.

(Explanation of Examples) In Fig. 1 and Fig. 2, (1) is a cross section of an inverted truncated circle 5f.
The main body is a fl-shaped slug pot, with a trunnion shaft +21 [21] protruding from the center of the front and rear surfaces of its upper end, and a tilting pin support whose front shape is irregularly formed below these trunnion shafts (2). The portion (3) is integrally provided in a protruding manner.

The tilting pin support portion (3) is a horizontal plate-shaped protrusion 3a that protrudes horizontally from the iron shell of the slug bond main body (1), and a portion between the center of the upper surface of the protrusion 3a and the lower surface of the trunnion shaft (2). Consisting of continuous longitudinal protrusions 3b, the plate-shaped protrusions 3
There is a storage groove f4+ +4) (4) for the tilting pin on both sides of the top surface of a.
) is formed over the entire length of the protrusion 3a.

+5) +5) are these storage m t4+ (4) (4
) is a pair of flat ribs located below the protrusion 3a and arranged in parallel on the lower surface side of the protrusion 3a, whose inner end surface is the main body of the slag pot (1).
It is integrally fixed to the iron skin from the lower surface of the base end of the protrusion 3a to the outer peripheral edge of the bottom plate of the main body (1), and the upper end surface is fixed over the entire length of the lower surface of the protrusion 3a. It is. Furthermore, the bottom plate part (6) of the slag pot main body (1)
) The length of the lower end of the rib (5) protruding from the corner of the rib (5) is formed to a dimension that corresponds to 20 to 40% of the outer diameter of the bottom plate (6), and the lower end of the rib (5) Projecting part 3 from part
The outer end surface of the rib (5) between the tip corners of the lower surface of a is formed into a linear surface.

Further, on the outer peripheral surface of the slag pot main body (1), a plurality of reinforcing members (7) extending from the upper end to the lower end are protruded at regular intervals in the circumferential direction.

Note that the outer peripheral portion of the bottom plate portion (6) is formed into an annular thick portion 6a.

(8) is a tilting pin that fits into the retracted ti (4) (4) of the protrusion 3a.

Next, a method of constructing a slag pot having the rib f5) (5) of the above structure by modifying a conventionally used slag pot will be described.

First, the support part (3) of the conventional slag pot shown in Fig. 4
, the hanging ring piece 15 disposed on the lower surface of the ring piece 15 is removed by gas cutting along the lower surface of the iron skin of the slug head and the supporting part (3), and the cut surface is cut out by gouging. After processing, as shown in Fig. 5, a rib (5) with a protrusion width of 470 mm, a plate thickness of 80 mm, and a high tensile strength mi of 50 kg/mm class is formed.
(5), 45° to this rib (5), 40m deep.
After chamfering the grooves on both sides of m, weld the upper and inner end surfaces to both sides of the lower surface of the support part (3) and the outer surface of the iron skin of the slag pot using carbon dioxide arc semi-automatic welding.
It was 6.

With this configuration, it was possible to reliably prevent the periphery of the support portion from biting inward and being deformed due to thermal stress.

Next, Figure 6 shows that the entire steel shell, including the lower support part (3), has deformed and cracked, and the bottom plate part (6) has numerous melting losses and tortoise shell cracks, making it unusable. This figure shows an embodiment of the present invention in which a conventional slag pot that has been used as a slag pot is modified to obtain a slag pot with a quality higher than that of a new one.

In the figure, first, the height is 800 m+, the inner diameter of the upper end opening is 2230 vw, and the inner diameter of the lower end bottom plate (6) is 146 mm.
(JIllm, the thickness of the outer circumferential annular thick part 6a of the bottom plate part (6) is 1201) III+, the rib (5) projecting forward and backward
The dimension between the outer end surfaces of (5) is 3040 mm, and these ribs (5) have a thickness of 80 mm and a protrusion dimension of 595 m1)1
That is, the lower half of the slag pot is formed with a diameter ratio of 35% to the bottom plate part, and the plate thickness center-to-center dimension is 420n+m, and is arranged in parallel on both sides of the lower surface of the support part (3), and has a weight of about 5500 kg. is cast with 5C49 material and normalized at 930°C.

On the other hand, the upper half of the slag pot, which was no longer usable, was cut off, and the lower end opening of this upper half was joined to the upper end opening of the cast slag pot, welded, and integrated. An excellent slag pot with about 5 times the lifespan was obtained at about 30% the cost.

(Effects of the Invention) As described above, according to the slag pot of the present invention, on the lower surface side of the tilting pin support portion (3) protruding from the slag pot main body (1), on the upper surface side of the support portion (3). The storage groove formed (
4) A pair of ribs (5) (5) are arranged below (4) + 4) (4) in parallel, and the upper end surface of these ribs (t5) (5) (rolling pin support part (3) ) is fixed integrally over the entire length of the lower surface of the slag pot main body (1), and the protruding length of the rib (5) from the bottom of the slag pot main body (1) is 20 to 40% of the bottom diameter of the slag pot main body (1). These ribs (5) (5) can firmly prevent the peripheral part of the support part (3) from being deformed by digging into the inside during long-term use. It is possible to significantly reduce the deformation of the subcutaneous region, greatly increasing the service life, and it is safe to use and has good workability.

Further, the technical structure of the present invention can be easily applied to conventional slag pots by repairing or modifying them, and can be used economically and semi-permanently without being discarded.

[Brief explanation of drawings]

Fig. 1 is a partially longitudinal front view showing an embodiment of the present invention, Fig. 2 is a partially longitudinal side view thereof, Fig. 3 is a bottom view for explaining thermal stress, and Figs. 4 and 5 are A side view of the main parts showing an example of converting a conventional slag pot to the slag pot of the present invention, FIG. 6 is a side view of the lower half of the pot showing another example of the conversion, and FIG. 7 is a side view of the bottom half of the pot. FIG. 8 is a partially vertical side view of a deformed conventional slag pot; FIG. 9 is a front view of the main part showing the state before deformation; FIG.
The figure is a side view thereof. (1)... Slug pot main body, (2)... Trunnion shaft, (3)... Tilting pin support part, (4)... Storage groove, (5) (5)... Rib.

Claims (1)

[Claims] An anchor-shaped tilting pin support part (3) is provided protruding below the trunnion shaft (2) provided on the slug pot main body (1), and a tilting pin storage groove is provided on both sides of the upper surface of the tilting pin support part (3). (4
) (4), a pair of ribs (5) (5) are provided on the lower surface side of the tilting pin support portion (3) and positioned below the storage grooves (4) (4). The upper end surfaces of these ribs (5) (5) are connected to the tilting pin support part (3).
) are fixed integrally over the entire length of the lower surface of the slag pot main body (1), and the protruding length of the ribs (4) from the bottom of the slag pot main body (1) is 20 to 40% of the bottom diameter of the slag pot main body (1).
A slag pot characterized by being formed to the dimensions of.