JPH069063A - Preventing device for particle size segregation in transport process - Google Patents

Abstract

PURPOSE:To prevent particle size segregation of materials deposited in a surge hopper utilizing the force at falling of granular materials into the surge hopper by providing a chute formed into a groove-like discharge port provided with mixing plate funnel-shapedly, and providing a repulsion plate on the upper part of a mixing plate opposite to the transport end part of the chute. CONSTITUTION:By letting fall discharged materials from the center part of a belt conveyor 1 on a mixing plate 3 on the opposite side after colliding to a repulsion plate 2, the materials are let flow down spreading on the mixing plate 3. Further, remaining materials are directly let fall from the charging belt conveyor 1 onto a mixing plate 4. Meanwhile, the materials falling on the mixing plate 4 are let flow even in the thin part formed on the overlapped part with the repulsion plate 2, and let flow down spreading on the whole mixing plate 4. Thus, the materials of the mixing plate 4 and the mixing plate 3 can be mixed while colliding. As a result of this, there is no possibility that the material of large granular diameter is rolled down from the peak to the skirts of a deposited mountain, and particle size segregation is favorably eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a particle size segregation prevention device for charging a granular raw material conveyed by a belt conveyor into a surge hopper so as to make the particle size distribution uniform.

[0002]

2. Description of the Related Art Generally, when ores and cokes are cut from a storage hopper to a conveyor, particle size segregation occurs on the belt conveyor. When this is temporarily stored in a surge hopper (relay tank) and further cut out on a belt conveyor, particle size segregation is promoted.

Conventionally, for example, Japanese Utility Model Laid-Open No. 2-14346 discloses a device in which a two-divided repulsion plate is attached up to half in the width direction of a raw material falling from a belt conveyor to a surge hopper, and there is nothing in the remaining half position. However, the raw material on the center of the belt conveyor in the width direction is stored in the center of the surge hopper, and the raw material on the end of the belt conveyor in the width direction is stored on the wall side of the surge hopper.

For this reason, when there is a raw material having a relatively small particle size in the widthwise central portion of the belt conveyor and a raw material having a relatively large particle size is segregated and accumulated on both sides in the widthwise direction of the belt conveyor, it is left as it is. Particle size segregation also appears in the raw material in the surge hopper. That is, the central part of the surge hopper has a small particle size, and the surge hopper wall side has a large particle size.

In Japanese Patent Publication No. 1-30886, as shown in FIGS. 6 and 7, a distributor 12 and a two-divided chute 13 which divide the raw material falling from the charging belt conveyor 1 into the surge hopper 14 into half in the width direction. A device consisting of is disclosed.

In this apparatus, the particle size distribution of the raw material charged from the charging belt conveyor 1 is made symmetrical and
It is disclosed that if a pile of piles having the hopper center axis as the axis of symmetry is formed in the surge hopper 14, segregation in the width direction can be prevented on the conveyor 15 at the time of discharge.

The raw material charged in the surge hopper forms a pile of piles near both walls of the surge hopper, and fine grains are formed at the center of the pile and coarse grains and segregation occur at the bottom of the pile. For this reason, conversely to the above, the central portion of the surge hopper is a raw material having a relatively large grain size, and a raw material having a relatively small grain size is deposited on the wall side.

Further, in the shape of the surge hopper, the cutting method is center leading drop or wall leading drop, and if there is particle size segregation in the hopper as described above, the cut material on the belt conveyor in the longitudinal direction is cut off. Segregation becomes remarkable.

That is, if the particles are segregated and charged as shown in FIG. 8 (a), in the center cutting method of the surge hopper, the particle size distribution in the longitudinal direction of the conveyor is in the order of 1 to 4, and the small diameter is used. → Small diameter → Large diameter → Large diameter. Further, as shown in FIG. 8B, in the end cutting method of the surge hopper, large diameter → small diameter → small diameter → large diameter.

When the grain size segregation in the width direction and the length direction as described above occurs, for example, in the case of the raw material charged into the blast furnace, it affects the grain size distribution in the circumferential direction in the blast furnace and affects the gas distribution in the furnace. This causes unevenness and becomes a factor that hinders stable operation of the blast furnace.

[0011]

In order to prevent the particle size segregation of the material in the longitudinal direction of the belt conveyor when the material is cut out from the surge hopper by the above method, the particle size segregation does not occur in the surge hopper. Is to be charged. The present invention provides an apparatus for preventing the particle size segregation of the raw material deposited in the surge hopper by utilizing the force when the granular raw material falls in the surge hopper.

[0012]

According to the present invention, a chute having a groove-shaped discharge port provided with a mixing plate in a funnel shape is provided at the conveying end of a granular material conveying system in which a surge hopper is arranged. It is a particle size segregation prevention device in the carrying process in which a repulsion plate is provided above the mixing plate facing the carrying end.

[0013]

The operation of the present invention will be described with reference to FIGS. In the present invention, the mixing plates 3 and 4 are provided in the shape of a funnel and the chute having the groove-shaped discharge port 10 is provided, and the repulsion plate 7 is provided above the mixing plate 4. It rides on the mixing plate 3 through the plate 2 and falls while spreading on both sides of the mixing plate 3.

Further, the raw materials on both sides of the belt conveyor 1 directly drop onto the mixing plate 4, and spread and fall with a phenomenon that the raw material flows into the overlapping portion (central portion) with the repulsion plate 2 from both sides.

As a result, the raw material in the central part of the belt conveyor 1 and the raw materials on both sides are dropped and mixed from the same position and fall into the surge hopper 6. Therefore, even if there is segregation of the particle size on the belt conveyor 1, for example, The occurrence of particle size segregation in the surge hopper 6 is eliminated.

Further, since the raw materials respectively spread on the mixing plates 3 and 4 fall into the surge hopper 6 at a predetermined angle, both raw materials collide with each other or cross each other during the dropping. As a result, the raw material falls directly onto a relatively wide area and is deposited, resulting in a low pile. As a result, the raw material having a large grain size does not roll down from the peak of the pile to the skirt, and further, the grain size is not segregated and excellent.

[0017]

Embodiments of the present invention will be described with reference to the drawings.
1 to 3 are configuration diagrams of a particle size segregation prevention device in the raw material charging device of the present embodiment. This apparatus comprises a repulsion plate 2 and mixing plates 3 and 4, and a metal 7 having a self-liner on the surface is attached. The lower end of the mixing plate 3 and the lower end of the mixing plate 4 are provided with a predetermined space (about 200 mm) to form the groove-shaped discharge port 10.

Further, the repulsion plate 2 and the mixing plate 4 are separated by a space α (500
(mm)) and is installed above the mixing plate 4 and fixed to a base (not shown).

Experiments have shown that the mixing plates 3 and 4 are 55 °
It is provided at an angle a of ± 5 ° and has the same width as the first belt conveyor 1. Also, the repulsion plate 2 has an angle b of 65 ° ± 5 °,
It is preferable that the width is designed to be 30 to 50% of the width of the first belt conveyor 1.

In this embodiment, the raw materials are mixed by utilizing the raw material dropping force generated when the raw materials fall into the surge hopper 6 via the charging belt conveyor 1, and the raw materials discharged from the central portion of the belt conveyor 1 are mixed. Collides with the repulsion plate 2 and then drops it onto the mixing plate 3 on the opposite side, so that the raw material is mixed plate 3
Run down while spreading over the top. Further, the remaining raw materials fall on the charging belt conveyor 1 or directly on the mixing plate 4.

On the other hand, the raw material dropped on the mixing plate 4 flows into the thin portion formed in the overlapping portion of the repulsion plate 2 and spreads down the entire mixing plate 4 while flowing down. Thus, the raw materials of the mixing plate 4 and the raw materials of the mixing plate 3 can be collided and mixed.

It is preferable to increase the plate width of the mixing plates 3 and 4 so that the charging raw material falls in the same width as the width of the surge hopper 1. Further, the raw materials spread and fall on the mixing plates 3 and 4, and both raw materials collide with each other and are scattered or crossed under the groove-shaped discharge port 10 to have a small angle of repose in the surge hopper. Nakaridge type mountain is formed. This allows
Raw materials from the belt conveyor are mixed well, and raw materials with large particle size do not fall down from the top of the mountain and accumulate at the bottom of the mountain, and segregation of raw material particle size and brand segregation in the surge hopper is significantly reduced. Improve.

Segregation of grain size in width direction and segregation of grain size in longitudinal direction When average grain size is set to 1 as shown in FIG.
In the method of Japanese Patent No. 6, the segregation in the belt longitudinal direction is ± 4.
Although it was over 0%, in this example, the particle size segregation can be improved to ± 8%.

In the above, the present embodiment has mainly described the raw material transfer of the blast furnace, but the present invention is not limited to this, and can be applied to the transfer of powder and granules, which deviates from the scope of the present invention. Not something to do.

[0025]

INDUSTRIAL APPLICABILITY The present invention has a great effect of mixing the raw materials during storage in the actual hopper and preventing the segregation of the particle diameter due to the landslide in the hopper. Further, there is an effect that unmixed raw materials can be mixed and stored in the hopper.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a plan view of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a particle size segregation graph in the belt width direction.

FIG. 5 is a particle size segregation graph in the belt longitudinal direction.

FIG. 6 is a schematic diagram of a conventional example.

FIG. 7 is an explanatory diagram of an operation of a conventional example.

8A and 8B are explanatory views of a raw material flow path of a conventional example.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideki Yanami 1st Nishinosu, Oita-shi, Oita-shi Nippon Steel Corporation Oita Works

Claims (1)

[Claims] 1. A chute in which a mixing plate is provided in a funnel shape to form a groove-shaped discharge port is provided at a conveying end of a granular material conveying system in which a surge hopper is arranged, and the mixing is opposed to the conveying end of the chute. A particle size segregation prevention device in a carrying process, characterized in that a repulsion plate is provided above the plate.