JP5461831B2 - Sinter cake support stand - Google Patents

Description

  The present invention relates to a sinter cake support stand of a sintering machine for producing sintered ore used as a raw material in a blast furnace or the like.

  In iron making processes such as blast furnaces, sintered ore obtained by sintering powder iron ore into a lump with a sintering machine is often used as a raw material. FIG. 8 shows a sinter production process by a general sintering machine. In this sintered ore production process, first, the main raw material powdered iron ore, the auxiliary raw material limestone, and the fuel coke are cut out from the hoppers 11, 12, and 13, respectively. Condition and granulate to make a sintered raw material. This sintered raw material is transported to the surge hopper 16 and temporarily stored, then cut out from the drum feeder 17 and supplied to the supply portion of the sintering pallet 19 via the chute 18, so that the sintered raw material is placed on the sintered pallet 19. Layer 20 is formed. Then, the coke on the surface layer of the sintering raw material layer 20 conveyed by the sintering pallet 19 is ignited by an ignition furnace 21, and the coke is burned while sucking air below the sintering raw material layer 20. The sintering raw material layer 20 is sequentially sintered from the upper layer to the lower layer. The raw material thus sintered is discharged from the discharge part of the sintering pallet 19 as sintered ore.

  In the sintering method as described above, the upper layer portion of the sintered raw material layer is sintered before the lower layer portion to form a sintered mass (hereinafter referred to as “sinter cake”), and the raw material layer as the sintering proceeds. The lower part of the body is compressed under the weight of the sinter cake and becomes dense. For this reason, a support member (hereinafter referred to as “sinter cake support stand” or simply “stand”) that receives the weight of the sinter cake is installed so as to be buried in the sintering material layer on the sintering pallet. Techniques have been put into practical use for preventing a reduction in combustion rate and uneven combustion due to higher density in the lower layer of the layer. This sinter cake support stand is composed of a trapezoidal plate-like main body portion and an attachment portion continuous therewith, and is often integrally cast with heat-resistant cast steel and attached to the sintered pallet at the attachment portion.

By the way, the sinter cake support stand wears by rubbing against the raw material supplied to the top of the main body portion, and the side portion on the front side in the traveling direction stays in the discharge portion of the sintering pallet 19. Immediately after passing through the discharge part of the sintering pallet 19, the side part on the rear side in the traveling direction is worn by being collided with the sintered ore discharged from the subsequent stand. . As these wears progress, the weight of the sinter cake cannot be supported gradually, so it is necessary to replace it with a new one relatively frequently. On the other hand, as means for suppressing the progress of the wear of the stand main body, overlay welding on the top and both sides and a technique of forming the top and both sides with a composite layer containing hard particles have been proposed. (For example, refer to Patent Documents 1 and 2.) In these methods, there is a problem that the labor and cost for manufacturing the stand are significantly increased.
JP 2002-13876 A JP 2007-270170 A

  The subject of this invention is extending the lifetime of the sintering cake support stand installed in the sintering pallet of a sintering machine at low cost.

  Therefore, the present invention is said to increase the thickness of the parts of the main body of the sinter cake support stand that are subject to wear directly from the sinter cake, and reduce the pressure acting on these parts to suppress the progress of wear. By taking this measure, the stand life can be extended at a lower cost than when overlay welding or composite layer formation is performed. Moreover, in an actual sintering machine, there are many cases where a plurality of stands are arranged side by side in the advancing direction of the sintering pallet in a state where the stands are adjacent to each other, and the stands of the stands positioned at the end of the stand row are arranged. Focusing on the fact that the side part is aligned with the top of each stand and the wear progresses quickly, and the side part on the side that is hard to wear is restrained from being thickened, thereby suppressing an increase in the material cost and weight of the stand. I did it.

  Specifically, as a first means for solving the above-mentioned problems, it is installed along the traveling direction of the sintering pallet of the sintering machine, and is arranged adjacent to each other between the side portions of the plate-like main body. In the sinter cake support stand that constitutes a part of a stand row composed of a plurality of sinter cake support stands and is arranged at the end of the stand row, the top and bottom surfaces of the main body portion including the center surface are provided. The surface of the central portion is formed so as to protrude from at least one of the planes to be included and to be thick, and the side portion of the main body portion extends obliquely downward from both side ends of the top portion. A thick portion protruding from at least one of a plane including the back surface and a plane including the back surface is provided, and the thick portion on the end side of the stand row is formed wider than the other thick portion. Here, if the thick wall part on the stand row end side of the main body part is formed so narrow that it is farther from the top part, the thick part remains on the top side that is easily worn out of the side parts over a long period of time. As a result, the increase in material cost and weight can be reduced by reducing the number of thickened parts.

  Further, as a second means, a stand comprising a plurality of sinter cake support stands installed along the advancing direction of the sintering pallet of the sintering machine and arranged side by side on the side portions of the plate-like main body portion. In a sinter cake support stand that constitutes a part of the row and is arranged at the row end of the stand row, the top of the main body is projected from at least one of the plane including the center surface and the plane including the back surface. A flat surface and a back surface including the surface of the central portion along the side edge on the stand row end side of the main body portion, with the side portions of the main body portion extending obliquely downward from both side ends of the top portion A thick wall portion projecting from at least one of the planes including the side wall is provided, and the side portion having the other side edge is formed between the plane including the surface of the central portion and the plane including the back surface. In this way, compared with the first means, the portion of the main body portion to be thickened is further reduced, and the material cost and weight can be reduced accordingly.

  Here, the top part of the main body part may be formed in a shape having a convex curved outline. In this way, the thermal stress analysis shows that the maximum value of thermal stress is smaller than when the main body is trapezoidal, so it is expected that the possibility of cracking in the main body will be reduced. Is done.

  Moreover, the thickness of the thick part provided along the top part and the side edge of the main body part is the thickness when these parts are formed between the plane including the surface of the central part and the plane including the back surface. It is desirable to set it as 1.1 to 1.3 times. If the increase in thickness is less than 10%, sufficient wear-inhibiting effect cannot be obtained. If it exceeds 30%, when the raw material is discharged as sintered ore, it is easily caught by the thick part and the discharge position tends to be out of the predetermined position. Because it becomes.

  Furthermore, the area of the front and back surfaces of the thick wall portion provided along the top and side edges of the main body is preferably 10 to 50% of the front and back surfaces of the entire main body. This is because if the area of the thick part is less than 10% of the whole, a sufficient wear suppression effect cannot be obtained, and if it exceeds 50%, the increase in weight increases.

  In the present invention, as described above, since the portion of the main body portion of the sinter cake support stand that is easily worn is thickened to suppress the progress of wear, overlay welding, composite layer formation, or the like is performed. It is possible to extend the life of the stand at lower cost. In addition, when installing multiple stands side by side in the direction of travel of the sintering pallet, the side parts that are hard to wear are restrained from becoming thicker, which increases material costs and weight due to thickening. Can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and FIGS. 2-1 to 3 show a first embodiment. As shown in FIG. 1, the sinter cake support stand 1 is installed along the traveling direction of the sintering pallet 19 of the sintering machine in two sets in a general sintered ore manufacturing process (see FIG. 8). The stand rows 2 are configured such that each stand row 2 is arranged at predetermined intervals in the traveling direction and the width direction of the pallet 19. As shown in FIGS. 2-1 (a) to (d), FIGS. 2-2 (a) to (c), and FIGS. 2-3 (a) and (b), the structure of the plate-like main body 3 is shown. The main body 3 having a height of 400 mm is embedded in the sintering raw material layer 20 formed on the sintering pallet 19 and having a height of about 800 mm. The sinter cake produced | generated by sintering of 20 upper layer parts is supported.

  The main body portion 3 is integrally cast with the mounting portion 4 using heat-resistant cast steel having the composition shown in Table 1, and as shown in FIG. 2, the top portion 3a having a convex curved contour, and the top portion 3a and the mounting portion are attached. The center part 3b located between the part 4 and the side part 3c which spreads diagonally downward from the both ends of the top part 3a. The top part 3a protrudes from the plane including the surface of the central part 3b and the plane including the back surface, and is formed thick. Thick portions 5a and 5b are provided along both side edges to protrude from a plane including the surface of the central portion 3b and a plane including the back surface, and one of the thick portions 5a is the thick portion 5b on the other side. It is formed wider than.

  Here, the thicknesses of the thick portions 5a and 5b provided along the top portion 3a and both side edges are the thicknesses when these portions are formed between the plane including the surface of the central portion 3b and the plane including the back surface. 1.1 to 1.3 times that. Moreover, the area of the surface of the thick part 5a, 5b and the back surface is 10 to 50% of the area of the surface and the back surface of the main body part 3 as a whole.

  Accordingly, as compared with the case where the entire main body is formed between the plane including the surface of the central portion 3b and the plane including the back surface as usual, the pressure received by the top 3a and both side portions 3c from the sinter cake is reduced. The progress of wear can be suppressed. Moreover, since the increase in the thickness of the thick part is limited to 10 to 30% (5 to 15% on one side), when the raw material is discharged as sintered ore, it is caught in the thick part and hinders the discharge. There is little fear. Furthermore, since the weight increases as the wall thickness increases, the heat capacity increases, and the temperature at which the stand is heated decreases, thereby reducing corrosion, cracking and wear.

  As shown in FIG. 1, when the stand row 2 is configured by arranging two stands 1 adjacent to each other between the side portions 3 c of the main body portion 3, the stand side portion located at the row end of the stand row 2. Since 3c is easily worn, the wide thick portion 5a is disposed on the stand column end side.

  This sinter cake support stand 1 has the above-described configuration, and the top portion 3a of the main body 3 is formed in a shape having a convex curved outline, so that the crack of the main body is smaller than when the main body is trapezoidal. Hard to occur. And since the top part 3a of the main body part 3 is thickened and the progress of wear is suppressed by providing the thick parts 5a and 5b along both side edges, when performing overlay welding, formation of a composite layer, etc. Longer service life can be achieved at lower cost. Moreover, by making the thick portion 5a of the stand side portion 3c located at the row end of the stand row 2 wider than the thick portion 5b on the other side, the wear of the side portion 3c on the stand row end side is effectively reduced. In addition to being suppressed, the side portion 3c on the side that is less likely to be worn has a small area of the thick portion 5b, so that an increase in material cost and an increase in weight due to thickening can be suppressed.

  As for the shape of the stand main body 3, it is desirable that the top 3a has a convex curve as in the above-described embodiment, but FIGS. 3-1 (a) to (d) and FIG. 3-2 (a). The whole can also be made into a trapezoid as shown to-(c) and FIGS. 3-3 (a), (b).

  Moreover, the modification of the thick part 5a of the stand row | line | column end side of the example shown to FIGS. 2-1 to 3 is shown to FIGS. 4-1 (a)-(d) and FIGS. 4-2 (a)-(c). And shown in FIGS. 4-3 (a) and (b). In this modification, the thick portion 5a on the stand row end side is formed so as to become narrower as it is farther from the top portion 3a. Therefore, the thick portion 5a remains on the side of the top portion 3a that is easily worn out of the side portions 3c for a long period of time, and the wear suppression effect substantially equivalent to the example of FIGS. The number of parts to be thickened is smaller than in the examples of 1-3, and the increase in material cost and weight due to the thickening can be further reduced.

  In this modification as well, as shown in FIGS. 5-1 (a) to (d), FIGS. 5-2 (a) to (c) and FIGS. 5-3 (a) and (b), The shape of the entire part 3 can be transformed into a trapezoid.

  Next, an experiment for confirming the wear resistance performance of the stand of the embodiment described above will be described. The experiment is shown in FIG. 1 in which two stands each having a conventional shape without a thick portion (comparative example) and two stands having a thick portion having the shape shown in FIGS. The wear rate (advancing speed of wear) was compared with continuous use in the installed state. The experimental conditions and results are shown in Table 2.

  Here, the thickness of the upper and lower ends of the main body of each stand is shown as an experimental condition in Table 2. The thickness of each comparative example increases linearly from the upper end to the lower end of the main body. This is because each example has a thick portion that is thicker than the corresponding part of each comparative example by a certain thickness (14 mm). The wear rate is obtained by dividing the amount of decrease in height at the center position in the width direction of each stand main body by the number of days used.

  As is clear from Table 2, the variation in wear rate is slightly large in both the comparative example and the example, but the average wear rate in the example is suppressed to ½ or less of the average wear rate in the comparative example. It was confirmed that it was excellent in wear resistance.

  FIGS. 6-1 (a) to (d), FIGS. 6-2 (a) to (c) and FIGS. 6-3 (a) and (b) show a second embodiment. In this embodiment, the side part 3c having one side edge of the main body part 3 is formed between a plane including the surface of the central part 3b and a plane including the back surface, and has a constant width along the other side edge. The thick part 5b which protrudes from the plane containing the surface of the center part 3b and the plane containing the back surface is provided. The configuration of the other parts is the same as that of the first embodiment, including that the top 3a of the contour of the convex curve shape is thickened. When a stand row similar to that shown in FIG. 1 is configured, the thick portion 5b on the other side is disposed on the row end side. Therefore, although the wear suppression effect is slightly smaller than that of the first embodiment, the material cost can be reduced and the weight can be reduced by the amount of the portion of the main body 3 that is thickened.

  In this embodiment as well, as shown in FIGS. 7-1 (a) to (d), FIGS. 7-2 (a) to (c) and FIGS. 7-3 (a) and (b), the stand body The shape of the entire part 3 can be transformed into a trapezoid.

  In addition, the present invention is not limited to each stand of a stand row constituted by two stands as in the above-described embodiments, but also a stand arranged at the end of a stand row constituted by three or more stands. Of course it can also be applied. In that case, the stand to which the present invention is not applied should be formed thick only at the top.

The perspective view which shows the installation state of the stand of 1st Embodiment. a is a perspective view of the stand of FIG. 1, b to d are a left side view, a right side view, and a front view of a, respectively. a to c are a back view, a plan view, and a bottom view of FIG. a is a sectional view taken along line IIa-IIa in FIG. 2-1 (d), and b is a sectional view taken along line IIb-IIb in FIG. 2-2 (b). a is a perspective view of a modification of the shape of the main body of the stand of FIGS. 2-1 to 3, and b to d are a left side view, a right side view, and a front view of a, respectively. a to c are a back view, a plan view, and a bottom view of FIG. a is a sectional view taken along line IIIa-IIIa in FIG. 3-1 (d), and b is a sectional view taken along line IIIb-IIIb in FIG. 3-2 (b). a is a perspective view of another modification of the main body shape of the stand of FIGS. 2-1 to 3, and b to d are a left side view, a right side view, and a front view of a, respectively. a to c are a back view, a plan view, and a bottom view of FIG. a is a sectional view taken along line IVa-IVa in FIG. 4-1 (d), and b is a sectional view taken along line IVb-IVb in FIG. 4-2 (b). a is a perspective view of a modification of the shape of the main body of the stand of FIGS. 4-1 to 3, and b to d are a left side view, a right side view, and a front view of a, respectively. a to c are a back view, a plan view, and a bottom view of FIG. a is a cross-sectional view taken along the line Va-Va of FIG. 5-1 (d), and b is a cross-sectional view taken along the line Vb-Vb of FIG. 5-2 (b). a is a perspective view of the stand of the second embodiment, b to d are a left side view, a right side view, and a front view of a, respectively. a to c are a back view, a plan view, and a bottom view of FIG. 6-1 (a), respectively. a is a sectional view taken along line VIa-VIa in FIG. 6-1 (d), and b is a sectional view taken along line VIb-VIb in FIG. 6-2 (b). a is a perspective view of a modification of the shape of the main body of the stand of FIGS. 6-1 to 3, and b to d are a left side view, a right side view, and a front view of a, respectively. a to c are a back view, a plan view, and a bottom view of FIG. a is a sectional view taken along line VIIa-VIIa in FIG. 7-1 (d), and b is a sectional view taken along line VIIb-VIIb in FIG. 7-2 (b). Illustration of general sinter manufacturing process

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stand 2 Stand row | line | column 3 Main-body part 3a Top part 3b Center part 3c Side part 4 Attachment part 5a, 5b Thick part 19 Sinter pallet

Claims (6)

It constitutes a part of a stand row consisting of a plurality of sinter cake support stands installed along the traveling direction of the sintering pallet of the sintering machine and arranged side by side on the side portions of the plate-like main body, in sinter cake supporting stand disposed in front end of the sintering pallets traveling direction of the stand column, the thick so as to protrude from at least one of the plane containing the plane and the back surface including the surface of the central portion of the top portion of the main body portion And forming at least one of a plane including the front surface of the central portion and a plane including the back surface along both side edges of the main body portion. A sinter cake support stand provided with a protruding thick part, wherein a thick part on the front side in the advancing direction of the sintering pallet is formed wider than a thick part on the rear side . 2. The sinter cake support stand according to claim 1, wherein a thick part on the front side of the main body part in the traveling direction of the sintering pallet is formed so as to be farther from the top part. It constitutes a part of a stand row consisting of a plurality of sinter cake support stands installed along the traveling direction of the sintering pallet of the sintering machine and arranged side by side on the side portions of the plate-like main body, in sinter cake supporting stand disposed in front end of the sintering pallets traveling direction of the stand column, the thick so as to protrude from at least one of the plane containing the plane and the back surface including the surface of the central portion of the top portion of the main body portion And forming the side portion of the main body portion so as to spread obliquely downward from both side ends of the top portion, including the center surface along the front side edge of the main body portion in the traveling direction of the sintering pallet. A thick portion protruding from at least one of the plane including the plane and the back surface is provided, and the side portion having the side edge on the rear side is formed between the plane including the surface of the central portion and the plane including the back surface. Sintake Key support stand.   The sinter cake support stand according to any one of claims 1 to 3, wherein a top portion of the main body portion is formed in a shape having a convex curved contour.   The thickness of the thick part provided along the top part and the side edge of the main body part is the thickness of the case where these parts are formed between the plane including the surface of the central part and the plane including the back surface. The sinter cake support stand according to any one of claims 1 to 4, wherein the ratio is 1 to 1.3 times.   The surface area and the back surface area of the thick wall portion provided along the top and side edges of the main body portion are 10 to 50% of the surface area and the back surface area of the entire main body portion. The sinter cake support stand according to any one of 5.

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