JP2020121849A - Granular material discharge gate - Google Patents

Abstract

To provide a granular material discharge gate having superior maintainability and longer life, and easily manufactured.SOLUTION: An openable and closable granular material discharge gate for discharging a granular material from a granular material storage container storing the granular material includes: a gate body; and a plurality of weirs provided on a surface of the gate body on the granular material storage container side. The granular material to be fed into the granular material storage container is held between the plurality of weirs, to configure self-lining.SELECTED DRAWING: Figure 6

Description

The present invention relates to an openable and closable granular material discharge gate for discharging a granular material such as a blast furnace raw material from a granular material storage container.

At the top of the blast furnace, a plurality of bunkers, which are containers for individually storing raw materials such as iron ore and coke powder, are provided. The inside of these bunker is charged into the blast furnace by opening a raw material discharge gate (powder and granule discharge gate) provided at the bottom of the bunker (for example, FIG. 6 of Patent Document 1).

The raw material discharge gate, which is a particulate discharge gate, is used to prevent wear and cracks from occurring due to falling contact with the raw material (powder and granules) that is put into the bunker and the flow of load when discharging the raw material. The mainstream structure is one in which a liner is attached to the main body (parent board) and the gate body (parent board) is protected by controlling and replacing the thickness of the liner.

JP 2001-294326 A

However, depending on the installation location of the raw material discharge gate (powder and granular material discharge gate), there are cases where the impact is large, and where periodic inspection and confirmation cannot be performed for a long period. In such a gate, the liner is deformed and the gate body (parent plate) is deformed together with the liner, and it is not necessary to replace only the liner, but it is necessary to replace the entire gate including the main body (parent plate). Not good and poor maintainability. In addition, the liner wear may locally progress due to the impact of dropping the raw material, or the liner may crack due to insufficient strength, and it is often necessary to replace the liner before the life of the liner is reached. There is. In addition, when a liner is provided, it is difficult to obtain high manufacturing precision, and it takes time to manufacture.

Therefore, an object of the present invention is to provide a powdery or granular material discharge gate which has good maintainability, has a long life, and is easy to manufacture.

In order to solve the above problems, the present invention provides the following [1] to [5].

[1] An openable granular material discharge gate for discharging a raw material from a granular material storage container that stores the granular material,
The gate body,
A plurality of weirs provided on the surface of the gate body on the side of the granular material storage container,
Have
A granular material discharge gate, characterized in that the granular material charged in the granular material storage container is held between the plurality of weirs to constitute a cell lining.

[2] The powder according to the above [1], wherein the powder or granular material is a raw material for blast furnace, and the raw material for blast furnace discharged by opening the powder or granular material discharge gate is charged into the blast furnace. Particle discharge gate.

[3] A height and/or an interval of the weir are set so that the powdery particles are held between the plurality of weirs in a state where the powdery material discharge gate is opened. The powder or granular material discharge gate according to the above [1] or [2].

[4] The weir spacing is determined by using the angle of repose of the powder or granular material as an index so that the gate body is not exposed when the powder or granular material discharge gate is opened. ] The powder discharge gate according to any one of [3].

[5] The powder/granule discharge gate according to any one of [1] to [4], wherein the surface of the gate body is subjected to overlay welding.

According to the present invention, the gate main body is provided with a plurality of weirs, and the powder granules are held between the plurality of weirs so as to configure the cell lining, so that the construction of the liner becomes unnecessary, and the maintainability is good, In addition, it is possible to obtain a powdery or granular material discharge gate that has a longer life and is easy to manufacture.

It is a side view which shows the state which provided an example of the granular material discharge gate to which this invention is applied in the bottom part of the bunker, and shows the state with the gate closed. It is a side view showing a state where an example of a granular material discharge gate to which the present invention is applied is provided at the bottom of a bunker, and shows a state in which the gate is opened. It is a side view which shows the other example of the granular material discharge gate to which this invention is applied. FIG. 4 is a cross-sectional view of the powder/granule discharge gate of FIG. 3. It is a sectional view showing a granular material discharge gate concerning one embodiment of the present invention. It is sectional drawing which shows the implementation state of the granular material discharge gate of FIG. It is sectional drawing which shows typically the state which the parent board was exposed when the powder-and-particles discharge gate was opened. It is sectional drawing which shows typically the state which does not expose a parent board when a powdery-particles discharge gate is opened. It is a top view which shows an example of arrangement|positioning of a weir. It is a top view which shows the other example of arrangement|positioning of a weir.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 and 2 are side views showing an example of a granular material discharge gate to which the present invention is applied, provided in the bottom of a bunker. FIG. 1 is a state in which the gate is closed, and FIG. 2 is a state in which the gate is open. Indicates the state.

As shown in these figures, the granular material discharge gate 1 is openably and closably provided at the bottom of a bunker 2 which is a granular material storage container for storing granular materials, for example, blast furnace raw materials such as iron ore and coke. And is used, for example, when charging raw materials into a blast furnace. As shown in FIG. 1, when the raw material which is a granular material is loaded into the bunker 2, the granular material discharge gate 1 is closed and the granular material (raw material) is loaded by the belt conveyor 3. It Further, as shown in FIG. 2, the granular material discharge gate 1 is opened, whereby the granular material (raw material) is discharged from the bunker 2 and charged into, for example, a blast furnace.

1 and 2 show a granular material discharge gate 1 in which two gates are separated from each other, but as shown in the plan view of FIG. 3 and the sectional view of FIG. The type in which 1a and the outer gate 1b are vertically overlapped may be used. At this time, as shown in FIG. 3, since the centers of the end portions of the inner gate 1a and the outer gate 1b are concave, it is possible to adjust the discharge amount of the granular material (raw material).

FIG. 5 is a cross-sectional view showing a powder or granular material discharge gate according to an embodiment of the present invention. The granular material discharge gate 1 has a main plate 10 that is a gate body and a plurality of weirs 11 provided on the surface of the main plate 10 on the bunker 2 side. FIG. 6 is a cross-sectional view showing an implementation state of the granular material discharge gate of FIG. By providing the plurality of weirs 11, when the bunker 2 is initially charged with the powder or granular material (raw material), the powder or granular materials 12 are retained in the pockets between the plurality of weirs 11 as shown in FIG. It By allowing the granular material 12 to be retained between the plurality of weirs 11 even when the granular material discharge gate 1 is opened, the retained granular material 12 functions as cell flying, It is possible to suppress abrasion due to the powder or granular material (raw material) when charging the powder or granular material (raw material). Also, since no liner is provided, there is no risk of the liner breaking.

At this time, the weir 11 is set to have a height and/or an interval such that the weir 11 can hold the powder 12 even when the powder discharge gate 1 is opened. Further, when the master plate 10 is exposed when the powder discharge gate 1 is opened, as shown in FIG. 7, the powder (raw material) collides with the exposed portion when the powder is charged. Therefore, as shown in FIG. 8, when the powder and granular material discharge gate 1 is opened, the interval between the weirs 11 is set so that the parent plate 10 is not exposed, using the angle of repose of the powder and granular material (raw material) 12 as an index. It is preferable to determine. However, depending on the properties of the powdery particles 12, there are cases where the adhesiveness and the adhesiveness are high, and there are also cases where the powdery particles are compacted by the impact of dropping. In such a case, the distance between the weirs 11 can be made wider than the distance determined by the repose angle of the powder or granular material (raw material).

As the parent plate 10, general structural steel, cast products, or the like are used. Further, as the weir 11, a conventional liner material having an edge can be used. As the material of the weir 11, a wear-resistant steel plate such as high chromium steel used as a liner material, ceramics, or the like can be used. Further, the weir 11 can be fixed to the parent board 10 by welding, bolt fastening, or the like.

When it is feared that the granules (raw material) collide with the master board 10 or the load flow of the granules (raw material) shortens the life of the master board 10 with the master board 10 exposed, the master board 10 The surface of 10 may be subjected to overlay welding (hard overlay welding). As a result, the strength of the parent plate 10 is increased, and the life of the powder and granular material discharge gate 1 can be further extended.

The arrangement of the weir 11 is not particularly limited, and is appropriately set so that the powdery particles can be easily held. For example, they may be arranged in parallel as shown in FIG. 9 or may be arranged in a staggered manner as shown in FIG.

As for the cell flying itself, for example, application examples such as cell flying to a conveyor chute part (for example, JP-A-2014-118294) and cell-lining for protecting a bunker inner liner (for example, JP-A-2011-106001) are available. Exists. However, these are fixed objects, and the idea of performing cell-lining on a movable object such as a granular material discharge gate has not existed in the past.

According to the present invention, a plurality of weirs are provided in the particulate discharge gate, and the granular material is packed in the pocket between the plurality of weirs so that the granular material is retained even when the particulate discharge gate is opened. It is possible to maintain the self-flying effect while being a movable object.

Therefore, in the particulate discharge gate, it is not necessary to provide a liner on the entire surface of the master plate, and it is not necessary to replace the liner and the gate set due to the deformation of the liner and the accompanying deformation of the master plate. .. In addition, since the liner is not provided, the liner wear is not locally promoted by the drop impact of the raw material which is the powder or granular material, and the liner is not cracked due to insufficient strength, so that the life can be extended. Further, there is no problem of manufacturing accuracy as in the case of providing the liner, and the manufacturing is easy.

Furthermore, by applying build-up welding (hard build-up welding) on the surface of the master plate 10, the strength of the master plate 10 is increased, and the life of the particulate discharge gate 1 can be further extended.

Although the embodiments of the present invention have been described above, these are merely examples and are not restrictive, and omissions, substitutions, and changes can be made in various forms without departing from the scope of the idea of the present invention. Needless to say.

For example, in the above-described embodiment, an example in which the present invention is applied to the discharge gate of the blast furnace raw material is shown, but the present invention is not limited to this, and when discharging powder or granules that may cause damage or wear to the powder or granule discharge gate. If so, it is applicable.

1 Particle discharge gate 1a Inner gate 1b Outer gate 2 Bunker 3 Belt conveyor 10 Parent board (gate body)
11 weir 12 powder and granules

Claims (5)

An openable granular material discharge gate for discharging the granular material from a granular material storage container that stores the granular material,
The gate body,
A plurality of weirs provided on the surface of the gate body on the side of the granular material storage container,
Have
A granular material discharge gate, characterized in that the granular material charged in the granular material storage container is held between the plurality of weirs to constitute a cell lining. The powder/granule discharge gate according to claim 1, wherein the powder/granule is a raw material for a blast furnace, and the blast furnace raw material discharged by opening the powder/granular discharge gate is charged into the blast furnace. .. The height and/or the interval of the weir are set so that the powder and granules are held between the plurality of weirs in a state where the powder and granule discharge gate is opened. The powder or granular material discharge gate according to claim 1 or claim 2. The interval between the weirs is determined by using the angle of repose of the granular material as an index so that the gate body is not exposed when the granular material discharge gate is opened. 3. The powder/granule discharge gate according to any one of 3 above. The powder or granular material discharge gate according to any one of claims 1 to 4, wherein the surface of the gate main body is subjected to overlay welding.

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