JPS6140331Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Field of industrial application] The present invention is designed to remove smoke and dust from a dust source whose vertical position changes depending on the work situation, such as when tapping steel into an electric furnace into a ladle suspended by a crane. This relates to a dust collection hood that suctions and collects dust.

[Prior art]

Conventionally, dust collection hoods have a suction port that covers the movement range of the dust source, and because of this, suction is drawn from areas that do not require suction (areas where dust is not generated), so the suction air volume can be increased. This required unnecessary power.

Some solutions include installing a dust collection hood that follows the movement of the dust source, but this requires a large amount of space for the moving equipment, has a complicated structure, and requires a considerable amount of power to move the hood. There are drawbacks. Furthermore, in order to move the hood, a gap is required between the hood and the duct and between the side wall of the hood and the ladle, and air enters through this gap during dust collection, resulting in insufficient dust collection. There is.

[Purpose of invention]

The present invention solves the above-mentioned drawbacks and is a dust collection hood that can obtain high dust collection effects with a small suction air volume, does not require a large space, has a simple structure, and can be operated with a small amount of power. The purpose is to provide

[Structure of the idea]

The gist of the present invention is to have a suction port that is horizontally partitioned by a plurality of dividing plates, which is rotatable near the end of the suction port, and a high-flow suction port located below. , and a cylinder in which suction ports are provided adjacent to each other in the circumferential direction so that the slow-flow suction ports are located at the top.

Next, the present invention will be explained with reference to an embodiment of the dust collecting hood shown in the drawings.

Figure 1 is a side sectional view of the dust collection hood of the embodiment, Figure 2
The figure is a plan view of FIG. 1.

The main parts of this dust collecting hood are a dust collecting cylinder 1, a suction part 4, and a side wall 8.

In these figures, 8 is erected in a U-shape,
The side wall 8 is a side wall that supports the dust collecting cylinder 1 and the suction part 4, and the side wall 8 has the suction part 4 on the wall facing the U-shaped opening side. The suction section 4 has a plurality of dividing plates 2
Suction ports 3A to 3 provided by dividing the horizontal direction by
It has I.

Reference numeral 1 denotes a fixed outer cylinder 5 that communicates with each of the suction ports 3A to 3I of the suction section 4, and a high-flow suction port 16 and a slow-flow suction port that are rotatably provided in the outer cylinder 5 in close proximity to the ends of each suction port. 17, and an inner cylinder 6 that limits the communication of the suction ports 3A to 3I to the suction ports that match both suction ports 16 and 17, and is connected to an exhaust fan (not shown). It's communicating. The outer cylinder 5 and the inner cylinder 6 are installed at the vertical center of the suction section 4 in order to equalize the suction air volume from the suction ports 3A to 3I even if the position of the dust source changes.

In a state where both the high flow rate suction port 16 on the narrow side and the slow flow rate suction port 17 on the wide side are communicating with any of the suction ports 3A to 3I, the high flow rate suction port 1
6 communicates with a suction port near the ladle 12, and the high-flow suction port 16 communicates with a suction port located upwardly from the ladle 12, and the slow-flow suction port 17 communicates with a suction port located upwardly from the ladle 12. are provided adjacent to each other in the circumferential direction so as to be located above.

FIG. 3 shows a specific example of the shape of the slow-flow suction port 17, and shows a state in which the high-flow suction port 16 is positioned at the suction port 3E, and the slow-flow suction port 17 is positioned at the suction ports 3A, 3B, and 3C. . In order to increase the flow path resistance as a means of performing slow flow suction, the suction port 3A is
3C shows a shape in which the opening area of the slow-flow suction port 17 is smaller than the total opening area of 3C, and FIG. 3a is an example in which the opening width in the circumferential direction of the inner cylinder is narrowed, and FIGS. 3b and c This is an example in which the opening length in the axial direction of the inner cylinder is reduced.

In FIGS. 1 and 2, 9 is a movable hood wall with a cover 10 that covers the upper side wall 8, 11 is a crane for transporting the ladle 12 to a predetermined position, and 13 is an electric furnace. Steel gutter, 14
-a is an air curtain nozzle provided at the lower end of the side wall 8 to block air from entering from below;
14-b is an air curtain nozzle for blocking air from entering from the side where the electric furnace 13 is located;
The blower 15 can blow out air for the air curtain.

[Function] Next, the function of the dust collection hood of the above embodiment will be explained.

First, when tapping steel in an electric furnace, the ladle 12 is set at a first predetermined position 12-a below and in front of the tapping gutter 13 of the electric furnace using the crane 11, and the movable hood wall 9 is driven to move the ladle 12 upwards from the side wall 8. Cover with cover 10. Next, the position of the inner cylinder is adjusted by rotating the inner cylinder 6 so that the suction port 3E located immediately above the ladle 12 set at the predetermined position 12-a communicates with the high flow rate suction port 16, and After the exhaust fan (not shown) and the air curtain blower 15 are operated, steel extraction is started.

The smoke dust emitted from the ladle 12 travels at a speed of more than several meters per second, but since the suction port 3E that performs high-flow suction is located close to the dust source, the high-flow rate is generated through the suction port 3E. Most of it is sucked by the suction port 16. The smoke dust that has not been sucked in by the suction port 3E is completely sucked in by the slow-flow suction port 17 via the suction ports 3A to 3C above the suction port 3E.

That is, the ratio of the area of the slow flow suction port 17 to the opening area of the suction holes of the suction ports 2A to 3C (slow flow suction port area/suction port area) is decreased, while the ratio of the area of the slow flow suction port 17 to the suction hole opening area of the suction ports 2A to 3C is
Since the area of the high-flow suction port 16 is not smaller than the area of Flow rate suction port 1
Therefore, the suction force of the exhaust fan can be concentrated on the suction port 3E, resulting in a high flow velocity at the suction port 3E, and a slow flow velocity at the suction ports 3A to 3C. Therefore, the ladle 1 is fed through the suction port 3E located in the vicinity of the dust source.
Dust generated from 2 can be side-suctioned at high flow rate and large flow rate, and most of the generated dust can be sucked here. Due to the suction of the suction port 3E, the smoke dust that has not been sucked in by the suction port 3E flows from the tapping gutter 13 side toward the suction port 3E, and is directed toward the upper suction ports 3A to 3C, and the flow rate decreases. Therefore, suction can be performed even at a slow flow rate through the slow-flow suction port 17, and dust is completely sucked out by suction through both suction ports 16 and 17.

Further, in this state, air curtain nozzles 14-a and 14-b provided at the front and lower ends of the side walls block air entering from the front and below of the hood, thereby increasing the smoke collection effect.

Dust generation is constantly prevented by rotating the inner cylinder 6 in accordance with the descent of the ladle 12 as the tapping process progresses, and making adjustments so that the suction port near the ladle 12 matches the high-flow suction port 16. All can be aspirated.

[Effect of idea]

In this way, according to the dust collection hood of the present invention, since it is equipped with the suction port and the inner cylinder having both suction ports, the exhaust fan is always placed close to the moving dust source. By concentrating the suction force, suction can be performed at a high flow rate and a large flow rate, thereby achieving a higher dust collection effect. According to this embodiment, the air flow rate required for suction by a conventional dust collector is 10 to 20%.
The same dust collection effect as before was obtained with a small suction flow rate.

In addition, the dust collection hood of the present invention does not require a large space, has a simple structure, has low equipment costs, can be operated with small power, and has low running costs.

According to the present invention, various drawbacks of the prior art can be solved as described above, and a more effective smoke collection effect can be obtained.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of the device according to the present invention, FIG. 2 is a plan view of the device according to the present invention, and FIG. 3 shows a specific example of the slow-flow suction port provided in the inner cylinder. In the figure 1...Dust collecting tube, 2...Dividing plate, 3A to 3I
... Suction port, 4 ... Suction part, 5 ... Outer cylinder, 6 ...
Inner cylinder, 8...Side wall, 9...Movable hood wall, 10
...Cover, 11...Crane, 12...Ladle,
13... Steel tapping gutter of electric furnace, 14-a, 14-b...
... Air curtain nozzle, 15... Air curtain blower, 16... High flow rate suction port, 17... Slow flow rate suction port.

Claims (1)

[Scope of utility model registration request] A suction port is horizontally partitioned by a plurality of dividing plates, and is rotatable near the end of the suction port, with a high-flow suction port located below and a slow-flow suction port located above. A dust collection hood comprising an inner cylinder in which each suction port is provided adjacent to each other in the circumferential direction so that the suction ports are located adjacent to each other in the circumferential direction.