JPH0332720B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for charging sintering raw materials in a DL sintering machine.

[Conventional technology]

As is well known, the DL sintering machine has pallets 1 arranged in an endless chain as shown in the block diagram of FIG. A charging hopper 3 for storing bed ore and a charging hopper 4 for bed ore are provided. There is usually a drum feeder 5 at the bottom of the charging hopper 3.
is provided, and by rotationally driving the drum feeder 5, the raw material 2 stored in the charging hopper 3 is
Cut out and place on pallet 1. A sloping chute (not shown) is provided between the drum feeder 5 and the pallet 1, and the raw material falling from the drum feeder 5 is generally charged through the sloping chute.
In this way, bedding ore is supplied to the pallet 1 from the charging hopper 4, and the raw material 2 cut out from the charging hopper 3 is charged thereon in a layered manner. The raw material 2 charged to the pallet 1 is ignited at the surface layer in the ignition furnace 6 to start firing, and as the pallet 1 advances, the firing progresses sequentially to the lower layer and reaches the ore discharge section 7.
The entire amount completes sintering and becomes sintered ore, which is discharged from the ore discharge section 7.

During this firing process, on both sides of pallet 1,
It is known that gaps occur due to compaction of raw materials. When this gap is created, the airflow resistance naturally decreases, and excessive air flows through this gap, making the ventilation in the width direction of the pallet 1 unbalanced. As a result, problems such as variations in the quality of the sintered ore and a decrease in product yield have occurred. Therefore, in order to prevent such problems from occurring, a method has been adopted in which the charging density is increased by, for example, tapping or pushing the material layers on both sides of the pallet 1.

By the way, the raw material level in the charging hopper 3 tends to be low at both sides in the width direction (direction perpendicular to the traveling direction of the pallet 1) and high at the center. For this reason, due to the well-known percolation phenomenon, coarse grain raw materials tend to gather near the side walls of the charging hopper 3, and fine grain raw materials tend to gather in the central part. Therefore, as a result of charging the raw material 2 into the pallet 1 with such a particle size distribution, the particle size distribution of the raw material layer on the pallet 1 also has a large amount of coarse-grained raw material near the side walls, and a large amount of fine-grained raw material in the center. This caused so-called grain size segregation, which increased the number of grains, and this, together with the gaps caused by compaction, caused a significant imbalance in ventilation in the width direction.

Many proposals have been made in the past regarding methods for preventing this particle size segregation. For example, JP-A-53-
In Publication No. 91001, the running speed of a shuttle conveyor that reciprocates and supplies raw materials to a charging hopper is slowed at both ends of the charging hopper and increased at the center, thereby increasing the raw material level in the hopper at both sides. A method of controlling the particle size distribution of raw materials on a pallet by distributing the particles high and low in the center has been disclosed.
In Japanese Patent No. 10878, a swingable cylindrical chute is used to supply raw materials to a charging hopper, and the hopper is adjusted by detecting that the chute has reached the maximum angle of inclination and maintaining that state. A means for equalizing the level of internal raw materials is disclosed.

[Problem that the invention seeks to solve]

None of the above-mentioned conventional techniques has a function that satisfies the controllability of particle size segregation in the width direction, and it has not been possible to reliably eliminate the imbalance in ventilation. In addition, equipment costs were high, and maintenance management was also difficult.

The present invention aims to fundamentally solve the problems in these conventional techniques, and provides a charging method that makes it possible to accurately control the particle size distribution of raw materials on a pallet according to the properties of the raw materials, operating conditions, etc. This is what we provide.

[Means for solving problems]

In order to solve the above problems, the present invention temporarily stores the sintering raw material in a charging hopper provided above the ore feeding side of an endless chain pallet, and then transfers it onto the pallet via a drum feeder. DL to charge
In a raw material charging method for a sintering machine, a plurality of strip members are provided in the upper opening of the charging hopper and are inclined downwardly from both side ends of the charging hopper toward the center, at least at the center side end. The sintering raw material is arranged at predetermined intervals so as to be sequentially stepped, and the sintering raw material is supplied from both ends of the charging hopper, thereby controlling the particle size distribution in the width direction of the sintering raw material. .

Next, the specific configuration of the present invention is shown in FIGS. 1 and 2.
A detailed description will be given based on the cross-sectional structural diagram of the raw material charging section shown in the figure.

In the figure, 1 is the pallet, 3 is the charging hopper,
5 is a drum feeder. The raw material 2 is transferred from a conveyor equipment, for example, a belt conveyor 8 to a charging hopper 3.
It is supplied to the charging hopper 3 via a chute 9 disposed at both end portions 3a of the hopper. In this example, two series of belt conveyors 8 are arranged corresponding to the charging hopper side ends 3a, but as shown in FIG. Hopper both ends 3a
It may be configured so that it is supplied to

A strip member 10 is provided in the upper opening 3b of the charging hopper 3.
is installed. This strip member 10 is composed of a strip member whose cross-sectional shape is round, square, etc.
A plurality of rods are arranged at predetermined intervals with respect to the traveling direction y of the pallet 1, and each one extends from both side ends 3a of the charging hopper 3 toward the center side of the pallet 1 in the width direction x, and downwards. I'm inclined to. That is, the center side end 3a of the strip member 10 is fixed to both side ends 3a of the charging hopper 3, and the center side end 10b is fixed at the center side of the hopper 3, and the center side is at a lower level than the both side ends 3a. In addition, as shown in FIG. 2, adjacent strip members 10 are arranged so that the heights of the center side end portions 10b are shifted and the heights of the adjacent strip members 10 are sequentially shifted.

The strip member 10 can be fixed, for example, by fixing the both end portions 10a to the lower part 9a of the chute 9 as shown in FIG. Although not shown, any suitable means may be used, such as fixing directly to the side wall of the charging hopper 3, or fixing to a bracket provided on the side wall of the charging hopper 3. On the other hand, for the center end portion 10b, upper and lower support members 11 are attached to the side wall of the charging hopper 3, as shown in the side sectional view in FIG. 2 and the perspective view in FIG. 3 showing details of part A in FIG. Attach the pallet 1 to this support member 11.
The holding member 12 is held at a predetermined interval in the traveling direction y of
, and then fixed to this holding member 12 via a fixture 13. Note that if a male screw is formed on the outer periphery of the holding member 12 and a female screw is formed on the inner surface of the fixing metal fitting 13 and screwed together, the holding member 12 is configured to be rotatable. The height of the fixture 13 can be easily adjusted simply by rotating it, which is effective.

If the spacing between the strip members 10 is still narrow, for example, as shown in FIG. Then, the holding member 12 is attached to this support auxiliary member 11a.
If the strip member 10 is held by the holding member 12a in the horizontal direction by stretching the holding member 12a in the horizontal direction, it is effective to avoid the phenomenon in which the holding member 12a is clogged with coarse sintering raw materials, etc. be.

The strip member 10 is connected to the charging hopper 3 as shown in FIG.
In other words, it is not essential to join the respective strip members 10 extending from both sides at the center side; for example, as shown in FIG. It may be configured to protrude from 3a by a predetermined length l. In the experience of the present inventors, the length l is the size of the hopper,
It was confirmed that the function of the present invention can be substantially achieved as long as it is 500 mm or more without being affected by the amount of raw material supplied. Furthermore, by fixing both ends 10a of the strip member 10 to the lower part of the chute 9a and attaching a vibrator 31 to the chute 9, and applying vibration to the chute 9 at an appropriate timing or continuously during operation, the chute 9 of the raw material 2 and the strip This is effective in preventing adhesion to the member 10.

[Effect]

As previously explained, the raw material 2 is first dropped into the chute 9 provided close to both ends 3a of the charging hopper 3, and from the chute 9 it is transferred to the charging hopper 3.
is supplied to both side ends 3a. A strip member 10 is attached to both end portions 3a of the charging hopper, and extends from the end portion 3a downwardly toward the center in the width direction.
The raw material 2 sews through the gap between the strip members 10 and falls downward.

By the way, the strip members 10 have predetermined intervals as described above, and extend downwardly and toward the center. Moreover, the center-side end portions 10b of the strip member 10 are sequentially arranged at different heights. For this purpose, the raw material 2 supplied to the side end portion 10a of the strip member 10 is fed to the center side while sliding or rolling on the strip member 10 by its own weight. During this time, fine grains fall near the side edges 10a, and as the grains become coarser they are fed to the center and fall. Therefore, in the raw material 2 that has fallen into the charging hopper 3, fine grains are deposited on both ends 3a, and many coarse grains are deposited in the center. In this state, when the raw material 2 is charged onto the pallet 1 by the drum feeder 5, fine grained raw materials are stacked near the side wall 1a of the pallet 1.
Coarse grain raw materials are stacked in the center of the pallet, which prevents the occurrence of gaps due to compaction of the raw materials during the firing process, and can effectively eliminate unbalanced ventilation.

Now, the interval d of the strip member 10 with respect to the pallet traveling direction y is usually set from 5 to 5, depending on the particle size characteristics of the raw material.
It is set within a range of 10mm. The degree of downward inclination is set within a range that allows the raw material 2 to maintain an efficient flow, and according to the experience of the present inventors, a preferred angle is 25 to 35 degrees. Furthermore, the center side end portion 10b of the strip member 10
The difference in level may be W-shaped or M-shaped as shown in FIGS. 2 and 6 mentioned above, and the height difference h
The preferred amount was about 30 to 40 mm in order to achieve the above effect.

It should be noted that the side end portions 10a of the strip member 10 may also be sequentially stepped at different levels within a range that satisfies the above condition (downward inclination). In particular, when the side end portion 10a is fixed to the lower part 9a of the chute 9 at approximately the same level as shown in FIG. The disadvantage is that the amount of fall is reduced. In order to eliminate such drawbacks, the side end portions 10a of the strip member 10 may also be sequentially stepped, or the seventh
As shown in Figure a, it is effective to fix the chute 9 at approximately the same level as the midsection of the chute 9.

〔Example〕

The invention was carried out on a sintering machine with a daily capacity of 5500 tons. The arrangement of the strip members 10 and the size of the charging hopper 3 in this embodiment are as shown in FIGS. 7a and 7b. In Fig. 7a, the straight line 20 is the center line of the charging hopper 3, and the strip members 10 are made of round steel with a diameter of 5 mm, and are arranged at intervals of 5 mm and at an angle of 0.85°, as shown in Fig. 7b. It was the difference. Also, strip member 1
The side end 10a of 0 is fixed to the upper surface of the chute 9,
Its fixing position was 450mm outside the hopper side edge.

In this way, the raw material 2 with an average particle size of about 3.1 mm is charged through the chute 9 provided at both ends of the hopper 3.
The particle size distribution of the raw material 2, which was fed from the raw material 2 and charged into the pallet 1 via the drum feeder 5, was investigated. Figure 8 shows an example of the investigation results as a diagram, and shows the average particle size of samples sampled at the measurement points shown in Figure 7 a, comparing the example of the present invention and the conventional example. It is.

As can be seen from FIG. 8, in the charging method based on the present invention, fine grain raw materials were concentrated on both sides of the pallet, and it was confirmed that the desired particle size distribution in the width direction could be ensured. Next, as a result of performing a sintering operation using the above charging method, it was found that no gaps were observed on both sides of the pallet with the charging method of the present invention, and the amount of air permeability measured just below the pallet was uniform in the width direction x. It was confirmed that there is.

Furthermore, the cost for carrying out the present invention is about 10% that of, for example, the above-mentioned equipment for controlling the running speed of the shuttle conveyor, and the maintainability is also extremely excellent.

〔Effect of the invention〕

As explained above, the present invention has a plurality of strip members that are inclined downwardly from both ends of a charging hopper toward the center, and are arranged in a predetermined manner so that the height of the end on the center side is shifted so that the heights of the strip members are sequentially different from each other. The sintering raw materials are arranged at intervals, and the sintering raw materials are supplied from both ends of the charging hopper to control the particle size distribution in the width direction on the pallet. Fine grain raw materials are stacked near the side walls, and coarse grain raw materials are stacked in the center. Therefore, during the sintering process, there are no gaps on either side of the pallet due to the sintering of the raw materials, and the unbalance of ventilation in the width direction of the pallet is eliminated, making it possible to sinter evenly and homogeneously, improving the quality of the sintered ore. It is possible to eliminate variations in the product and improve the yield of finished products. In addition, when implementing this charging method,
The structure of the equipment is simple, the maintenance management is excellent, and it is extremely easy to implement.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment based on the present invention, and shows a sectional structural view of a raw material charging section, Fig. 2 is a side sectional view of Fig. 1, and Fig. 3 is a perspective view of section A in Fig. 2. Fig. 4 is a cross-sectional structural diagram of a raw material charging section showing another embodiment based on the present invention, Fig. 5 is a structural diagram showing a well-known general sintering machine, and Fig. 6 is a structural diagram of another strip member holding structure. FIG. 7 is a side sectional view showing an embodiment, and FIG. 7 shows a specific embodiment based on the present invention, FIG. 7a is a longitudinal sectional view, and FIG.
is a side sectional view, and FIG. 8 is a diagram showing an example of the results of an investigation of the particle size distribution of the raw material in the width direction of the pallet. 1...Pallet, 2...Sintering raw material, 3...Charging hopper, 3a...Both ends of charging hopper, 3b...Top opening of charging hopper 3, 4...Charging hopper, 5...
Drum feeder, 8... Belt conveyor, 9... Shute, 10... Strip member, 10a... Side end of strip member, 10b... Center side end of strip member, 11... Support member, 11a... Support auxiliary member, 12, 12a... Holding member, 13... Fixing metal fittings.

Claims (1)

[Claims] 1 Raw material charging of the DL sintering machine, in which the sintering raw material is temporarily stored in a charging hopper installed above the feed side of an endless chain pallet, and then charged onto the pallet via a drum feeder. In the method, a plurality of strip members, which are inclined downward from both ends of the charging hopper toward the center, are arranged in the upper opening of the charging hopper at predetermined intervals so that at least the center side ends are successively stepped. A method for charging sintering raw materials, characterized in that the grain size distribution in the width direction of the sintering raw materials is controlled by arranging the sintering raw materials and supplying the sintering raw materials from both ends of the charging hopper.