JP2582086B2 - Crushing method of sintered cake - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of crushing a sintered cake in a sintering ore mining section, and more particularly to a method of crushing a sintered cake to prevent over-crushing.

<Prior Art> FIG. 5 is a sectional view showing a conventional method for crushing a sintered cake. After the sintering machine 1 completes sintering, the sintering cake 2 separates from the pallet 3 at the discharge end, falls onto the crushing guide 4, and further has the crusher 5 and the receiving teeth 6.
Primary crushed by the cooling device 8 via the chute 7
Supplied above.

<Problems to be Solved by the Invention> The problem here is that when the sintered cake 2 is separated from the pallet 3 and falls on the crushing guide 4, it is excessively pulverized by a drop impact. Here, the powdering rate of -5 mm is 10 to 20% as shown in FIG. 6, which means that it is resintered as returned ore and the resintering cost is high. It is.

It is an object of the present invention to prevent the above-mentioned sintered cake from being excessively pulverized due to a drop impact and to reduce the amount of returned ore.

<Means for Solving the Problems> In order to achieve the above object, a method for crushing a sintered cake according to the present invention comprises a plurality of wedges arranged in a longitudinal direction at intervals in a pallet width direction of a sintering machine. A sintering raw material is charged on a pallet having a great bar with a mold projection, and sintering is performed while providing a groove extending in a longitudinal direction on a lower surface of the sintering raw material, and is separated from the pallet at a discharge end of the sintering machine. The sinter cake is inverted while being supported by the L-shaped arm of the sinter cake inversion device arranged adjacent to the discharge end, and then dropped on a crezzle type cutter having a downward gradient in a transfer direction arranged below. In this case, the sintered cake is crushed into blocks.

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a sintering apparatus in which a sintering cake inverting device 9 capable of suitably implementing the present invention and a crezzle type cutter 10 having a gradient in a transfer direction are provided between a sintering machine 1 and a crushing machine 5. FIG. 2 is a cross-sectional view showing a mining part, FIG. 2 is a perspective view showing a specific configuration of a sintered cake reversing device 9 and a grizzly cutter 10, and FIG. 3 is a cross-sectional view taken along the line AA of FIG. 4 (a) is a sectional view of the pallet 3, and FIG. 4 (b) is a plan view of the pallet 3.

As shown in FIG. 2, the sintered cake reversing device 9 includes an L-shaped arm 12 attached to a shaft 11 at a pitch of 200 to 400 mm.
The shaft 11 includes a cylinder 15 for providing reversing drive via a bearing 13 and a lever 14 for supporting both ends of the shaft 11.

In addition, a grizzly cutter having a downward slope in the transfer direction
As shown in FIG. 2, the structure of the cutter 10 is disposed below the sintering cake reversing device 9 and has a cutter 16 having a downward gradient in the transport direction at a pitch of 50 to 100 mm, a gantry 17 for supporting the cutter 16,
The cross section of the cutter 16 is hollow as shown in FIG. 3 in order to cool the cutter 16, and a cooling pipe 18 allows cooling water to flow through this section so that the cutter 16 can be forcibly cooled.

Further, as shown in FIG. 4, the wedge-shaped projection-equipped great bars 19 extending in the longitudinal direction at a height of 50 to 100 mm at a pitch of 100 to 150 mm in the width direction of the pallet 2 are arranged at equal intervals in the width direction. An inverted V-shaped groove 20 extending in the longitudinal direction is provided on the lower surface of the sintered cake 2.

In some cases, in addition to the wedge-shaped projection-equipped great bar extending in the longitudinal direction, a similar wedge-type projection-equipped great bar extending in the width direction with an interval in the longitudinal direction of the pallet may be provided. . In this case, it becomes difficult for the sintering cake to be detached from the pallet, and the pallet is detached while being moved to the return side, so that the installation positions of the sintering cake reversing device and the grizzly cutter need to be relatively shifted downward. .

<Operation> In general, the sintering secondary blending raw material 26 is loaded on the pallet 3 of the sintering machine 1 via the feed hopper 21, the drum feeder 22, and the chute 23 as shown in FIG. After that, it is flattened by the cut gate 24, the carbon material on the surface of the raw material 26 is ignited by the ignition furnace 25, and after ignition, it is directed downward by the main blower 30 via the wind leg 27, the gas main duct 28, and the dust collector 29. , The sintering reaction in the raw material proceeds continuously from the upper layer to the lower layer, the reaction is completed in about 15 to 20 minutes, and the sintered cake 2 is obtained in the mining section. .

At this time, according to the present invention, the lower surface of the sintered cake 2 is provided at a pitch of 100 to 150 mm in a width direction of the pallet 3 and a depth of 50 to 50 mm by a wedge-shaped great bar 19 having projections as shown in FIG.
A 100 mm inverted V-shaped groove 20 is formed.

At the discharge end of the sintering machine 1, the sinter cake 2 is intermittently detached due to the movement of the pallet 2.
Once the shaft 11 is rotated by about 90 ° by the cylinder 15 after being once supported at 12, the sintered cake 2 is inverted and falls onto the grizzly cutter 10 arranged below. Due to the drop impact force of the sinter cake 2 at this time, the sinter cake 2 is broken into blocks without excessive pulverization with the groove 20 facing upward as shown in FIG.

Of the crushed sintered cake, cutter 1
6 and discharged to the lower part, the lump cake of 100 mm or more slides down on the grizzly cutter 10 in the transport direction, is secondarily crushed by the crusher 5 and the receiving teeth 6 and is crushed by the lower chute 7.
To the cooler 8.

<Effect of the Invention> A sintered cake obtained by imparting an inverted V-shaped groove to the lower surface of the sintering raw material is inverted at the discharge end of the sintering machine, and is placed on a grizzly cutter provided at the lower portion. By dropping, the sintered cake can be broken into blocks.

As a result, excessive crushing due to a drop impact when the sinter cake is detached from the pallet at the discharge end and then falls on the crushing guide is prevented, and the amount of returned ore (-5 mm) is reduced.

[Brief description of the drawings]

1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view showing a main part of the present invention, FIG. 3 is a sectional view taken along the line AA of FIG. 2, and FIG. 4 is a cross-sectional view taken along the line BB in FIG. 1, FIG. 4 (b) is a plan view taken along the line CC in FIG. 4 (a), FIG. 5 is a cross-sectional view showing a conventional example, and FIG. It is a graph which shows the cumulative particle size distribution of sinter. DESCRIPTION OF SYMBOLS 1 ... Sintering machine, 2 ... Sintered cake, 3 ... Pallet, 5 ... Crusher, 9 ... Sintered cake reversing device, 10 ... Grizzled cutter, 11 ... Shaft, 12 ... L Arm, 15… Cylinder, 16… Cutter, 18… Cooling pipe, 19… Great bar with wedge-shaped projection, 20… Groove.

Claims (1)

(57) [Claims] 1. A sintering raw material is charged on a pallet having a plurality of wedge-shaped projection-equipped great bars arranged in a longitudinal direction at intervals in a pallet width direction of a sintering machine. Sintering while providing a groove extending in the longitudinal direction on the lower surface, sintering cake detached from the pallet at the discharge end of the sintering machine,
L of the sintered cake reversing device arranged adjacent to the discharge end
Sintering, wherein the sintering cake is crushed into blocks by dropping it on a grizzly cutter having a downward gradient in a transfer direction arranged below, after being inverted while being supported by the V-shaped arm. How to crush the cake.