JP2006118769A - Stand for supporting sintering cake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage to the tip of a crushing guide and to elongate the service life of a stand itself by easily separating a sintering cake from the stand when the sintering cake is discharged. <P>SOLUTION: The stand S for supporting the sintering cake is placed on a sintering pallet of a downward suction sintering machine. One surface in a range of 50-150 mm from the upper top of a side surface of an upper blade section of the stand S is reduced by 2-10 mm in thickness, and the thickness reduced section 3 is eiliminated by applying a building-up welded section 5 to the thickness reduced section 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sinter cake support stand (hereinafter simply referred to as a stand) for producing sintered ore to be used in a blast furnace in an ironworks.

  When manufacturing a sintered ore, air permeability may deteriorate by compressing the sinter cake itself by the dead weight of the sinter cake. As a method of preventing this and improving productivity, a plate-like support member having a trapezoidal cross section parallel to the advancing direction of the sintering pallet and a height of 200 to 400 mm, that is, a so-called stand is embedded vertically in the raw material packed layer. There is a method of arranging.

  However, in the process of sintering the sintering raw material in the sintering pallet, the deterioration form of the stand disposed in the sintering raw material layer has the occurrence and progress of cracks due to the thermal cycle due to operation, There is corrosion and wear due to rubbing with sintered ore in a high-temperature oxidizing / sulfurizing atmosphere for firing and discharging raw materials. Patent Document 1 discloses a method of extending the life extension by applying wear-resistant overlay welding to a ridgeline portion of the upper end of the stand where cracks are generated or a side portion where thinning wear occurs in order to prevent deterioration of the stand and further improve the life. Has been proposed.

  As shown in FIGS. 3 (a) and 3 (b), a built-up weld portion 6 having a thickness t of 3 mm is formed along the ridge line portion of the upper blade portion 1 of the trapezoidal flat plate stand S, and the upper portion A wear-resistant overlay weld 4 having a thickness t ′ of 3 mm is formed on both side surfaces of the blade portion 1.

JP 2002-13876 A

  However, in the build-up shape in the wear-resistant build-up welding described in Patent Document 1, in the blade portion 1, the build-up weld portion 4 protrudes from the material surface of the blade portion 1 by 3 mm on one side and 6 mm on both sides. For this reason, when the sinter cake is discharged, the sinter cake is caught on the build-up weld 4 and may be discharged after the normal discharge timing. For this reason, the impact load due to falling ore falling on the tip of the crushing guide disposed below the sintering pallet is increased, the wear of the crushing guide is increased, and the life of the crushing guide is inevitably shortened. There is. In addition, since the sinter cake is caught on the stand, the load on the stand itself increases, and there is a problem that further life extension cannot be expected.

  An object of the present invention is to prevent the wear of the tip of the crushing guide and extend the life of the stand itself while the sinter cake is easily detached from the stand when the sinter cake is discharged.

  The present invention has been made to solve the above-mentioned problems, and the means thereof is a stand disposed on a sintering pallet of a lower suction type sintering machine, from the upper top portion of the side of the upper blade portion of the stand. , A thickness of 2 to 10 mm, preferably 5 to 10 mm in thickness on one side in advance, and the thinned portion is subjected to build-up welding to eliminate the reduced thickness portion.

  This reduced thickness portion or build-up weld portion is 50 to 150 mm, preferably 70 to 150 mm, from the upper top portion of the side surface of the upper blade portion. This is because the degree of rubbing is small and there is a sufficient life extension effect due to the wear resistance and heat crack resistance inherent in the stand material, and it is not necessary to exceed that. On the other hand, when the thickness is 50 mm or less, the upper blade portion below the surface is worn and the effect cannot be obtained.

  Further, the thickness reduction (skin cut) thickness is set to 2 mm to 10 mm. When the thickness is 2 mm or less, the build-up thickness of the wear-resistant and corrosion-resistant build-up welded portion is small, and the expected life extension effect cannot be obtained. If the thickness is 10 mm or more, it is not necessary to obtain a wear resistance effect, and if the material of the upper blade is thin, the thickness of the upper blade is too small, This is because the design strength and proof strength of the material are insufficient. However, in order to sufficiently obtain the effect of extending the stand life, it is preferable that the build-up thickness is 5 mm or more.

  According to the present invention, when the sinter cake is discharged, the sinter cake is easily detached from the stand, and the life of the stand can be extended without damaging the tip of the crushing guide. The effect in the field is great.

Embodiments of the present invention will be described below.
FIG.1 and FIG.2 has shown the stand of the example of this invention arrange | positioned on the sintering pallet of a downward suction type sintering machine. The stand S shown in FIGS. 1A to 1C includes an upper blade portion 1 having a height of 300 mm and a thickness of 40 mm and a pedestal portion 2 having a height of 125 mm. And as shown by the solid line, on both side surfaces of the upper blade part 1, the position from the upper end to 100 mm is reduced by 2.5 mm on one side (skin cut) to provide the reduced thickness part 3. The nickel-base alloy powder, which is a wear-resistant and corrosion-resistant welding material having the components shown in Table 1, is welded to the thinned portion 3 with a thickness of 2.5 mm by the plasma powder overlay welding method. A weld 5 was formed.

  Furthermore, the build-up weld 6 was formed with a thickness of 2.5 mm along the ridge line portion of the upper blade portion 1. By this build-up welded portion 5, the thinned (skin cut) portions on both side surfaces of the upper blade portion 1 disappeared, and the entire side surface was made smooth with no step.

The stand S was installed on a pallet of a DL-type sintering machine having an effective area of 660 m ² , and the charging thickness of the sintering raw material was 600 mm and the production amount was 18000 t / day.
As a result of measuring the amount of wear of the stand S by stopping the sintering machine for periodic repair on the 365th day after installing the stand S, the amount of wear of the stand S including the overlay welding 5 and 6 is However, there was little wear of the crushing guide.

  Here, the dotted lines in FIGS. 1A and 1B and FIGS. 2A and 2B show other examples of the present invention. That is, the dotted line in FIG. 1 (a) is the thickness reduced so that the lower end of the reduced thickness portion 3 on the side surface of the upper blade portion 1 is stepped, and overlay welding is performed in accordance with this, and overlay welding is performed. The part 5 is formed.

  Further, as shown in FIG. 2 (a), the lower end of the thinned portion 3 on the side surface of the upper blade portion 1 is thinned so as to be inclined upward. And as shown in FIG.2 (b), build-up welding is also performed according to this and the build-up welding part 5 is formed.

  In any of these cases, the thinned portion 3 was set such that Y was 150 mm and X was 80 mm. This is because the wear load is larger on the rear side (Y side) than on the front side (X side) with respect to the traveling direction of the pallet truck, and the amount of wear has been measured. This is because the area of the welded portion 5 can be reduced, and an equivalent life extension effect can be obtained at a lower cost.

BRIEF DESCRIPTION OF THE DRAWINGS Embodiment of this invention is shown, (a) is a perspective view of a stand, (b) is a top view, (c) is sectional drawing which follows the II-II line of (b). FIG. 4 shows another embodiment of the present invention, in which (a) is a perspective view of a stand and (b) is a plan view. It shows a conventional example, (a) is a plan view of the stand, (b) is a cross-sectional view taken along the line II of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper blade part 2 Base part 3 Thinning part 4, 5, 6 Overlay welding part S: Stand

Claims (1)

  A sinter cake support stand disposed on a sintering pallet of a lower suction type sintering machine, wherein the thickness is reduced by 2 mm to 10 mm on one side in advance in the range of 50 to 150 mm from the upper top of the side of the upper blade portion of the stand. A sinter cake support stand characterized in that the meat thinning portion is subjected to overlay welding to eliminate the thinning portion.

Images