RU2210708C2 - Sinter machine truck - Google Patents

Abstract

FIELD: ferrous metallurgy. SUBSTANCE: invention relates to agglomerating of ores. Proposed sinter truck contains base which carries running and load rollers, bars and boards consisting of upper and lower parts with inclined inner surface, and longitudinal tennons located on lower parts of boards. Inner surface of lower part of each boards has three planes conjugated in tandem. First plane is located over longitudinal tennon, while two others form longitudinal projection whose apex is located at a distance equal to 0.08-0.22 of sinter truck boards height from working surface. Traces of first and other planes conjugated with first plane are intersected along line located at a distance equal to 0.005-0.02 of width of sinter truck from side surface of each tennon in contact with bars and at a distance equal to 0.02-0.06 of board height from working surface of bars. EFFECT: prevention of appearance of looseness in board zone of sinter truck between sinter and boards. 1 tbl, 2 dwg

Description

 The invention relates to the field of ferrous metallurgy, in particular to equipment for sintering ores and can be used on conveyor-type sintering machines.

 The closest to the proposed technical solution for the technical nature and the achieved result, according to the authors, is a sintering trolley sinter machine at the request of the Russian Federation 94005167 class. F 27 B 21/08, dated 02.14.94, publ. 01/27/96, Bull. 3, comprising a base on which running and load rollers, grates and sides are mounted, consisting of upper and lower parts, the inner surface of which is inclined, and longitudinal spikes placed on the lower parts of the sides.

 A disadvantage of the known technical solution is that in the dash area of the sintering car between the cake and the sides there are leaks (cracks) through which air is sucked, which reduces the vacuum in the vacuum chambers of the gas discharge path of the sinter machine and, as a result, reduces its performance. At the same time, part of the agglomerate located in the appliance zone of the sintering carriage is burned, which leads to an increase in the amount of substandard agglomerate.

 The task to which the proposed technical solution is aimed is to prevent leaks in the dash area of the sintering carriage between the cake and sides. In this case, obtaining such a technical result as increasing the production and quality of the sinter is achieved.

 The above disadvantages are eliminated by the fact that in a sintering trolley of an agglomeration machine containing a base on which running and load rollers, grates and boards are mounted, consisting of upper and lower parts, the inner surface of which is inclined, and longitudinal spikes. placed on the lower parts of the sides, the inner surface of the lower part of each of the sides contains three consecutive planes, the first of which is located above the longitudinal spike, and the other two form a longitudinal protrusion, the top of which is located from the working surface of the grid-irons at a distance of 0, 08-0.22 of the height of the side of the sintering carriage, while the traces of the first and its associated planes intersect along a line located from the side surface of each of the studs in contact with the grates, on standing equal width 0,05-0,02 Spekatelnye trolley and the operating surface of the grate at a distance equal to the height of its side 0.02-0.06.

 A comparative analysis of the proposed technical solution with the prototype shows that the proposed technical solution is distinguished by its structural design, namely the shape of the lower part of the sides of the sintering carriage and its parameters. It follows that the proposed solution meets the criteria of the invention of "Novelty."

 A comparative analysis of the proposed solution, not only with the prototype, but also with other technical solutions, did not reveal the essential features inherent in the proposed technical solution. Thus, the proposed combination of significant differences provides the above technical result, which, according to the authors, meets the criteria of the invention "Inventive step".

The proposed technical solution will be clear from the following description and the drawings attached to it:
figure 1 shows a General view of the sintering cart;
figure 2 shows a fragment I of figure 1.

 The sintering trolley of the sintering machine contains a base 1, on the axles 2 of which the running 3 and cargo 4 rollers are mounted. On the base 1 are also fixed grate 5 and sides, consisting of the upper 6 and lower 7 parts, the inner surface of which is made inclined. The lower parts 7 of the sides are provided with longitudinal spikes 8 included in the corresponding recesses 9 of the upper part of the base 1. The inner surface of the lower part 7 of each of the sides contains three consecutive planes. The first - the plane 10 is located above the longitudinal spike 8, and the other two - the planes 11 and 12 form a longitudinal protrusion 13, the top of which is placed from the working surface -A- of the grid-irons 5 at a distance -h- equal to 0.08 ÷ 0.22 of the height - N-side of the sintering trolley. In this case, traces 10 and 11a of the first 10 and 11 planes conjugate to it intersect along a line 14 located from the side surface 15 of each of the spikes 8 in contact with the grid-irons 5 at a distance of -a equal to 0.005 ÷ 0.02 of width -B- the sintering trolley and from the working surface -A- of the grid-irons 5 at a distance of - 0- equal to 0.02-0.06 of the height -H- of its side.

 Sintering trolley operates as follows.

 The sintering trolley is included in the continuous conveyor belt of the sintering machine. As the ribbon advances onto the calf, the safety bed and the sinter charge are alternately loaded, which are subsequently subjected to ignition, sintering and, if necessary, cooling.

 In the instrument zone, the sucked-in gases are forced to move along a path repeating the geometry of the side walls, since in this zone the coefficient of gas friction on the smooth side walls is less than when it passes through the charge layer. But since the inner surface of the lower part of the bead is made of three conjugate planes (with the formation of a longitudinal protrusion and depression, see figure 2), the path of the passage of gases increases, and their direction also changes (along the curved surface of the wall). In addition, under the action of the vacuum created under the sintering trolleys and its own weight, the charge layer in the dash zone is pressed against the board. This is especially pronounced (a larger charge layer and a large projection onto a horizontal section) in the lower instrument zone. As a result, the process of self-compaction of the charge in the instrument zone is organized, the resistance to gas passage increases, which ultimately helps to prevent leaks between the cake and sides of the sintering carriage.

 Placing the top of the longitudinal protrusion 13 from the working surface -A- of the grid-irons 5 at a distance -h- equal to less than 0.08 of the height -H- of the sintering carriage, and the intersection line 14 of the tracks 10, 11a of the planes 10 and 11 located from the side surface 15 of each of the spikes 8 at a distance -a equal to less than 0.005 of the width of the -B sintering carriage and from the working surface -A- of the grid-irons 5 at a distance of -b- equal to more than 0.06 height -H- of the side of the sintering trolley, it is undesirable as in this case, “straightening” of the inner surface of the lower part 7 of the side occurs, a decrease in the path of the gases and a decrease in resistance to their passage, resulting in leaks and an increase in leakage in the instrument zone, a decrease in vacuum under the sintering carts and, ultimately, a decrease in the productivity of sinter production.

 Placing the top of the longitudinal projection 13 from the working surface -A- of the grid-irons 5 at a distance -h- equal to more than 0.22 of the height -H- of the side of the sintering carriage, and the intersection line 14 of the tracks of the planes 10 and 11 located from the side surface 15 of each of the spikes 8, at a distance -a- equal to more than 0.02 of the width -B- of the sintering trolley, and from the working surface -A- at a distance -b- equal to less than 0.02 of the height -H- of the sintering trolley, it is also impractical because that increases the likelihood of "underperformance" of the agglomerate and the strength properties significantly worsen VA the lower part of the sides, the consequence of which may be their breakdown and the emergence of an emergency during operation of the sinter machine. Along with this, significant labor costs arise, associated with the manufacture of castings of the lower parts of the sides of the sintering trolleys.

 In the sinter production of NLMK OJSC on the sinter machine AKM-312, tests of the operation of sintering carts of a new design were carried out. The table shows the average values of the studied technical characteristics in the production of sinter on them, which show a decrease in harmful air leaks, alignment of the sintering temperature field along the width of the sintering trolley and improvement of metallurgical properties of the sinter in the instrument zone.

 Thus, the implementation of the inner surface of the lower part of each side of the sintering trolley of the proposed design ensures the prevention of leaks in the appliance area of the sintering trolley by self-compaction of the charge in the said zone, which leads to an increase in vacuum under the sintering trolleys and, as a result, to an increase in the productivity of sinter production. Along with this, its quality also rises.

Claims (1)

 A sintering trolley of an agglomeration machine comprising a base on which running and load rollers, grates and boards are mounted, consisting of upper and lower parts, the inner surface of which is inclined, and longitudinal spikes placed on the lower parts of the sides, characterized in that the inner surface of the lower parts of each of the sides contains three planes sequentially conjugated with each other, the first of which is located above the longitudinal spike, and the other two form a longitudinal protrusion, the apex of which is puppy from the working surface at a distance equal to 0.08-0.22 height of the bead of the sintering carriage, while the traces of the first and the planes associated with it are crossed along a line located from the side surface of each of the studs in contact with the grate, at a distance of 0.005 -0.02 width of the sintering trolley, and from the working surface of the grid-irons at a distance equal to 0.02-0.06 of the height of its side.

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