RU2307300C2 - Sintering machine fire grate car - Google Patents

Abstract

FIELD: metallurgy, sintering equipment.

SUBSTANCE: invention relates to sintering equipment for agglomeration of ores and concentrates, namely, to design of fire grate cars. Proposed car has frame with carrying beams of running rollers, fire grate and sides made of two parts and detachable in height. Lower part of side is made detachable at lower level of transported material and it consists of several cross parts installed with clearances in between. Upper part of side is made in form of flat sheet provided with upper and lower rows of cuts displaced relative to each other in longitudinal direction and overlapping in middle part by Δ=0.1-0.3 of height of side upper part. Lower part of side is widened relative to longitudinal axis of car by b=0.02-0.04 of width of car fire grate. Such design of upper and lower parts of side makes it possible to dispense with special-shape sections with preservation of strength characteristics, prevents formation of cracks in lower part of side, exclude additional mechanical stresses in zone of connection of upper and lower parts of side.

EFFECT: improved repairability of car and increased capacity.

2 cl, 3 dwg

Description

The invention relates to the field of ferrous and non-ferrous metallurgy, and more particularly to sintering equipment for sintering ores and concentrates, and for the construction of grate carts.

Known grate trolley sinter machine (USSR Author's Certificate No. 578547, MKI F21B 21/04) containing a frame with load-bearing beams of running rollers and stationary sides connected to removable sides having the shape of an asymmetric strip with longitudinal ridges on the outside of the trolley. The disadvantage of this trolley is the low productivity and low durability of the removable boards, as well as the increased cost of manufacturing.

Known grate trolley sinter machine (USSR Author's Certificate No. 1370410, MKI F27B 21/04), containing a frame with load-bearing beams of the rollers and stationary sides installed at a distance from each other from their inner side, equal to 0.92-0.96 the distance between flanges of running rollers, and connected to removable sides made of profile steel and having longitudinal ridges on the outside of the trolley, the height of which is 0.25-0.35 of the height of the removable sides. Productivity increases due to the increase in the area of the grate trolley, and the stability of removable boards increases due to a certain configuration of the ridges, while the cost is reduced due to the implementation of removable boards from profile rolling.

The disadvantage of this trolley is the lack of durability and reliability due to the presence of stationary sides cast completely with the frame of the trolley, in which, due to the difference in temperature conditions of heating of the frame and the sides, dangerous temperature stresses cause cracking. In addition, the lower sides cast integrally with a massive body do not have the possibility of equal expansion with the upper sides, since they differ in the heating mode and thermal expansion coefficients, as a result of which additional mechanical stresses arise in the upper board at the points of its fastening. In addition, the completely fixed stationary sides and the complex configuration of the removable sides made of profile hire significantly complicate the manufacture of the trolley and increase its cost. The maintainability of the trolley is unsatisfactory, because in production conditions, there is not always a rare profile rental for replacing worn removable flanges, and in the event of defects in stationary flanges, the entire frame must be replaced.

The problem solved by the invention is to eliminate the possibility of cracking of the part of the sides adjacent to the grate, the elimination of mechanical stresses in the area of joining of the sides of the board, simplifying the design and increasing maintainability by using sheet metal trolleys for the manufacture of boards.

This problem is solved as follows.

In the well-known grate cart of an agglomeration machine, comprising a frame with supporting beams of running rollers, a grate and beads made of two parts detachable, ACCORDING TO THE INVENTION, the lower part of the bead is detachable at the level of the material being moved and consists of several transverse parts mounted with gaps between them. the upper removable part of the side is made in the form of a flat sheet in which the upper and lower rows of slots are made, offset relative to each other in the longitudinal direction and per describing in the middle portion by an amount Δ = 0,1-0,3 height of the upper bead.

In addition, the lower part of the bead has a broadening relative to the longitudinal axis of the cart by a value of b = 0.02-0.04 of the width of the grate.

The implementation of the upper and lower sides of the side in this way allows you to accordingly exclude the use of profile rolled products of a special shape while maintaining strength characteristics, eliminate cracking of the lower side of the side, eliminate additional mechanical stresses in the connection zone of the upper and lower sides of the side, as well as increase the maintainability of the trolley as a whole and increase performance.

Figure 1 shows a General view of the proposed trolley.

In Fig.2 shows a view on board the cart (view A in Fig.1).

Figure 3 shows the diagram of the distribution of stresses on board the cart.

The grate of the sinter machine consists of a frame 1 with load-bearing beams 2 of the running rollers 3, the grate of grate 4 and the sides, made detachable from two parts of the upper 5 and lower 6. The lower part 6 of the bead is made in the form of cast parts 7, 8 having a broadening b = 0.02-0.04 width In the grate there are 4 trolleys and bolted 9 on the frame 1 of the trolley at the lower level of placement of the transported charge 10. The gap e ₁ between parts 7, 8 is 2 mm. The upper part 5 of the bead is made in the form of a flat sheet attached by means of a bolted connection 11 to the lower part 6 of the bead.

The upper part 5 of the side has slots 12 located in places of greatest stress along its height, which are established empirically. According to the obtained stress diagrams (Fig. 3), the upper and lower rows of slots 12 are made, displaced relative to each other in the longitudinal direction and overlapping in the middle part by Δ = 0.1-0.3 of the height H of the upper part 5 of the bead.

The presence of slots 12 prevents the formation of thermal fatigue cracks in places of maximum temperature stresses due to uneven heating of the sides in a cyclic mode. Overlapping Δ provides the possibility of thermal expansion along the entire height of the upper part 5 of the side, which eliminates the appearance of temperature cracks. With a decrease in the overlap Δ, cracking occurs in the middle zone of the side part 5. With an increase in the overlap Δ, the design of the upper part 5 of the side is weakened.

The total width of the slots is at least 8 mm, and the width of each slot e ₂ individually does not exceed 4 mm. When the total width of the slots is less than 8 mm and when the upper edges of the sides are heated to a temperature of 500-600 ° C (experimentally established), the length of the upper part 5 of the side along the top due to thermal expansion extends beyond the size of the cart, which leads to deformations. When the width of the slot is more than 4 mm, a mixture is precipitated through it.

The implementation of the upper part 5 of the side in this way allows you to make it from a flat sheet while maintaining all the strength characteristics by removing temperature stresses in places of their increase. At the same time, the weight of the part is reduced, and the replacement of profile rolled products on a sheet provides the possibility of its operational production at the place of operation.

The implementation of the lower part of the side 6 detachable at the lower level of the transported hot material allows you to perform it from several parts and in conjunction with the mentioned connector to eliminate the occurrence of temperature cracks in it. In addition, the detachable lower side of the bead improves maintainability, since in case of wear only it must be replaced directly.

The slots 12 in the upper part 5 of the side and the presence of a gap e ₁ between the parts 7, 8 of the lower part 6 of the side together provide a commensurate expansion of the upper and lower parts of the sides and eliminate additional mechanical stresses.

The broadening b of the lower part 6 of the bead provides an increase in the area of the transported material and, consequently, the productivity of the sintering machine by 4-8%.

When the broadening value b is less than 0.02 of the width of the grate of the carriage, the broadening effect becomes insignificant, and when the value of b is more than 0.04, stagnation zones with worse sintering of the charge are formed at the sides.

Claims (2)

1. The grate of the sintering machine, comprising a frame with supporting beams of the rollers, the grate and the sides, made detachable in height of two parts, characterized in that the lower part of the side is detachable at the lower level of the transported material and consists of several transverse parts mounted with gaps between them, while the upper part of the bead is made in the form of a flat sheet in which the upper and lower rows of slots are made, displaced relative to each other in the longitudinal direction and overlapping in the middle part by Δ = 0.1-0.3 the height of the upper part of the side. 2. The grate of the sinter machine according to claim 1, characterized in that the lower part of the bead has a broadening relative to the longitudinal axis of the trolley by a value b = 0.02-0.04 of the width of the grate of the trolley.

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