JPH1019475A - Dust collecting device for melt furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collecting device for a melt furnace to reliably and high-efficiently suck and remove powder dust, fume, and toxic gas, generated in a series of working processes between charge of a raw material and the feed of molten iron. SOLUTION: A base duct 8 connected to a dust collection source is erected on a floor. A moving duct 9 is horizontally revolvably supported by the base duct 8. A dust collection hood 10 is arranged on the under surface of the protrusion end of the moving duct 9. An elevation mechanism is arranged at the base duct 8. A revolving mechanism is arranged between the base duct 8 and the moving duct 9. The moving duct 9 is expandably comprised by front and rear ducts 21 and 22 and an expansion mechanism is located between the two ducts 21 and 22. By operating displacement mechanism, the dust collection hood 10 is positioned above a generating spot for toxic dust to effect collection of dust.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collector for removing dust, fumes, harmful gases and the like generated around a melting furnace. This dust collector includes, for example, an umbrella-shaped dust collecting hood.

[0002]

2. Description of the Related Art When a melting furnace is operated, many harmful dusts and harmful gases are generated. At the time of charging the raw material, dust contained in the raw material rises in a plume from the melting furnace, and at the time of melting or tapping, a large amount of fume or harmful gas rises from the furnace opening or the tapping path. In order to remove such harmful dust, a melting furnace in which a plurality of dust collecting hoods are installed in a furnace body is known (literature unknown).

[0003] There, a first box-shaped dust collecting hood is formed so as to cover the furnace lid, and a second dust collecting hood is arranged on one side of the furnace lid. Further, a third dust collecting hood is arranged facing the tap hole. According to this melting furnace, dust at the time of charging the raw material can be suctioned and removed by the second dust collecting hood. Fumes and harmful gases generated during melting can be completely removed by suction with the first dust collection hood closing the furnace opening. The third dust collection hood is
Suction removal of harmful gas etc. rising from the tap.

[0004]

As described above, according to the melting furnace in which the first to third dust collecting hoods are installed in the furnace main body,
In a series of work processes from the input of raw materials to the tapping of hot water, harmful dust is suctioned and removed by each dust collecting hood, thereby preventing the working environment from being soiled. However, there is room for improvement in that harmful dust generated at the time of material input and tapping cannot be completely removed.

The second dust collecting hood is arranged only on one side of the furnace opening. Therefore, dust that rises in the vicinity of the second dust collecting hood when the raw material is charged can be sucked, but most of the dust is scattered around the melting furnace without being sucked. The third dust collecting hood can also suction fumes and harmful gases rising from the tap, but can hardly suck fumes generated from the ladle. In particular, the tendency is remarkable in a large ladle. When pouring the molten metal into the ladle through the runner, it is necessary to prepare a separate dust collector. When the ladle is suspended by the overhead traveling crane, the first dust collecting hood interferes with the suspension hooks and wires, so that the furnace main body can be tilted only at 90 degrees or less. There is a melting furnace with a dust collection hood arranged in a ring around the opening of the furnace, but a separate dust collection device must be prepared to remove harmful dust generated from the hot water supply path. Absent.

An object of the present invention is to provide a melting furnace capable of maintaining a favorable working environment by reliably sucking and removing harmful dust generated from a melting furnace or a ladle in a series of work processes from the input of raw materials to tapping. An object of the present invention is to provide a dust collector for a furnace. Another object of the present invention is to be able to displace the dust collecting hood to the optimum dust collecting position in response to the occurrence position of harmful dust in each work process. It is an object of the present invention to provide a dust collecting apparatus for a melting furnace which can collect harmful dust generated during operation of the melting furnace and efficiently collect the generated harmful dust.

Another object of the present invention is to provide an electromagnet and a ladle for charging raw materials which are suspended by an overhead traveling crane.
It is an object of the present invention to provide a dust collecting apparatus for a melting furnace which can efficiently collect dust by positioning a dust collecting hood at an optimum dust collecting position without interfering with a hanging hook or a wire. Another object of the present invention is to provide a dust collecting apparatus for a melting furnace which requires a small floor area for installation and can be additionally provided without any trouble to an existing melting furnace.

[0008]

Means for Solving the Problems A dust collector according to the present invention comprises:
A base duct 8 that is arranged on one side of the hot water tilting region of the melting furnace 1 and is connected to a dust collection source; a movable duct 9 that is provided to project upward from the melting furnace 1 continuously to the base duct 8; A dust collection hood 10 fixed to the end of the duct 9 is provided. The movable duct 9 is rotatably supported by the base duct 8, and is provided so as to be reciprocally swingable by the swivel mechanism 3 so that the dust collecting hood 10 can be reciprocated between the upper part of the melting furnace 1 and the upper part of the ladle 2. Can be The movable duct 9 is provided between the front duct 21, the front duct 21, and the rear duct 22 supported by the front duct 21 so as to be able to move back and forth. Retractable telescopic mechanism 24
And In the hood wall 41 of the dust collecting hood 10, escape grooves 42 and 43 are opened to avoid interference with the raw material input device 46 and the hanging body 6 for the ladle 2.

More specifically, the base duct 8 is provided with a fixed duct 11, an elevating duct 12 supported by the fixed duct 11 so as to be able to move up and down, and a fixed duct 11 provided between the fixed duct 11 and the elevating duct 12. An elevating mechanism 13 for performing an elevating operation. Lids 44 and 45 for opening and closing the escape grooves 42 and 43 are provided on the dust collecting hood 10, and a lid opening and closing mechanism for opening and closing the lids 44 and 45 is provided on the movable duct 9. The base duct 8 is erected and fixed at the corner of the retaining wall facing the furnace pit and the ladle pit. Either the front duct 21 or the rear duct 22 of the movable duct 9 is bent substantially in an L-shape in plan view, avoiding the molten metal tapping region of the melting furnace 1. The dust collecting hood 10 is formed in an umbrella shape, and escape grooves 42 and 43 are opened from the lower peripheral edge of the hood wall 41 to the vicinity of the upper peripheral edge. The lids 44 and 45 are provided so as to close most of the escape grooves 42 and 43 except for a part of the upper ends of the escape grooves 42 and 43. Thus, the escape grooves 42, 43 can be closed by the lids 44, 45 in a state where the suspension 6 is located at the upper end of the escape grooves 42, 43. The dust collecting hood 10 is provided with upper lids 42a, 43a for opening and closing the upper ends of the escape grooves 42, 43, and lower lids 42b, 43b for opening and closing other parts of the escape grooves 42, 43. Top lid 4
The lids 2a and 43a and the lower lids 42b and 43b can be individually opened and closed by a lid opening and closing mechanism.

[0010]

The dust collecting device changes the position of the dust collecting hood 10 in each of the work steps of charging, melting and tapping the raw material.
Dust is collected in a state where is located above the place where harmful dust is generated. For this purpose, the movable duct 9 is supported by the base duct 8 so as to be capable of turning, and furthermore, the reciprocating turning operation can be performed by the turning mechanism 23. Further, the movable duct 9 is connected to the front duct 21.
And the rear duct 22 so that the rear duct 22 can be moved in and out by the telescopic mechanism 24. At the time of charging the raw material and tapping the hot water, the suspended body 6 that suspends the raw material charging device 46 and the ladle 2 interferes with the dust collecting hood 10. In order to avoid this, in order to position the dust collecting hood 10 above the place where harmful dust is generated, escape grooves 42 and 43 are opened in the hood wall 41.

The dust collecting device in which the base duct 8 can be moved up and down by the fixed duct 11 and the elevating duct 12 is adapted to the dust collecting hood 1 according to the tilting state of the melting furnace 1 and the state of scattering of harmful dust.
By changing the position of 0 upward and downward, harmful dust can be efficiently captured. According to the dust collecting hood 10 in which the escape grooves 42 and 43 are opened and closed by the lids 44 and 45, the escape grooves 42 and 43 are
Blocking with 4 and 45 can prevent suction loss from the escape grooves 42 and 43. When one of the front duct 21 and the rear duct 22 is bent in a substantially L-shape, the dust collecting hood 10 is placed above the ladle 2 while the movable duct 9 is prevented from crossing the hot water tilting area of the melting furnace 1. Can be located.

When lids 44 and 45 are provided to close while leaving a part of the upper ends of the escape grooves 42 and 43, most of the escape grooves 42 and 43 can be covered by the lids 44 and 45 at the time of material input or tapping. By closing, suction loss from the escape grooves 42 and 43 can be suppressed.
Further, according to the lid structure in which the escape grooves 42, 43 are individually opened and closed by the upper lids 42a, 43a and the lower lids 42b, 43b, the whole of the escape grooves 42, 43 can be closed at the time of melting, etc. At the time of tapping, only the upper lids 42a and 43a can be opened and most of the escape grooves 42 and 43 can be closed with the lower lids 42b and 43b.

[0013]

1 to 11 show an embodiment of a dust collector according to the present invention. 1 and 2, reference numeral 1 denotes a melting furnace, and 2 denotes a ladle. The melting furnace 1 has a melting position in which the furnace opening surface is horizontal, and a position 90 ° from the melting position to the ladle pit side.
It can be tilted up and down between the tapping position that has been flipped up and tilted more than degrees. Reference numeral 3 denotes a fulcrum shaft for tilting up and down, and reference numeral 4 denotes a tap hole.
The ladle 2 is provided with a gate-shaped hanging frame 5 which is suspended and supported by a hanging wire 6 such as an overhead traveling crane or hoist or a hanging body 6 such as a hanging chain. At the front corner of the retaining wall facing the furnace pit and the ladle pit, a dust collecting device for sucking and removing harmful dust and gas generated during a series of work processes will be installed.

The dust collector includes a vertically long base duct 8 disposed in a retaining wall facing the hot water tilting region of the melting furnace 1, and a laterally extending protruding upper part of the melting furnace 1 continuous with an upper end of the base duct 8. And an umbrella-shaped dust collecting hood 10 fixed to the lower surface of the protruding end of the movable duct 9.

In FIG. 4, a base duct 8 is composed of a fixed duct 11 that is erected and fixed on the floor surface in the retaining wall, and a fixed duct 1 that is fixed.
An elevating mechanism 13 for moving the elevating duct 12 up and down is provided inside the fixed duct 11. A slide bearing member also serving as a sealing material is fixed to the inner surface of the upper end of the fixed duct 11 and the outer surface of the lower end of the elevating duct 12 to facilitate the elevating operation of the elevating duct 12. The fixed duct 11
It is connected to a dust collection source such as a suction fan and a bag filter via a duct 7 led out from the midway. Although not shown, a damper is provided inside the duct 7.

As shown in FIG. 5, the lifting mechanism 13 includes a forward / reverse rotation motor 14 disposed on the outer surface of the fixed duct 11 and a screw jack 15 disposed inside the fixed duct 11. The rotational power of the motor 14 is transmitted to the worm shaft 16 of the screw jack 15 via the coupling and the intermediate shaft, and the power is converted into rotation about the vertical axis by the worm mechanism in the jack case, and the output screw shaft 17 is raised and lowered. Let it.
The lower ends of the jack case and the protective pipe protruding from the lower part of the case are fixed to cross-shaped brackets 18 provided on the inner surface of the fixed duct 11, respectively. The upper end of the output screw shaft 17 is fixed to a cross-shaped connecting frame 19 provided on the inner surface of the lower end of the lifting duct 12.

In FIGS. 3 and 6, the movable duct 9 is
The front duct 21 includes a front duct 21 that is internally fitted to the upper end of the elevating duct 12 and protrudes laterally, and a rear duct 22 that is internally fitted to and connected to the front duct 21 so as to be retractable. A turning mechanism 23 is provided between the lifting duct 12 and the front duct 21, and a telescopic mechanism 24 is provided between the front and rear ducts 21 and 22. Front duct 2
A bearing 2 having a pivot shaft 25 fixed to a base end of the lifting duct 25 and a lower end and an intermediate portion of the pivot shaft 25 provided on an upper inner surface of the lifting duct 12.
The movable duct 9 is supported by the shafts 6 and 27, respectively.
Can be rotated around the central axis of the base duct 8. The two bearings 26 and 27 are supported by cross-shaped brackets 28 laid on the inner surface of the elevating duct 12, respectively. The lower bearing 27 has a radial bearing and a thrust bearing.

Referring to FIGS. 6 and 7, the turning mechanism 23 is constituted by using an air cylinder 30 as a power source, and is provided on a bracket 31 which is erected on the outer surface of the elevating duct 12 and protrudes from an upper surface of the front duct 21. The air cylinder 30 is disposed between the air cylinder 30 and the connecting piece 32. For details, a holder 33 that fixes the middle part of the cylinder body to the bracket 31
The piston rod is supported so as to be horizontally swingable about a shaft 34, and the piston rod is connected to the connecting piece 32 via a clevis 35 with a pin. By moving the piston rod back and forth, the movable duct 9 can reciprocate at least 90 degrees around the pivot shaft 25 as shown by the imaginary line, and the dust collecting hood 10 provided at the end of the duct is moved above the melting furnace 1. And the upper part of the ladle 2 are reciprocated.

As shown in FIG. 11, in order to prevent the movable duct 9 from abutting on the deck protruding from the upper peripheral surface of the melting furnace 1 when the melting furnace 1 is tilted to discharge hot water, a front duct is provided. 21 is bent substantially in an L-shape in plan view, and the tip of the duct is directed toward the tapping region of the melting furnace 1. The protruding end of the front duct 21 is formed in a straight line continuously with the bent portion, and the rear duct 22 is supported within the range of the straight duct portion so as to be able to move out and back.

In FIG. 8, an expansion / contraction mechanism 24 includes an air cylinder 38 having a cylinder body connected to the front duct 21 and a piston rod connected to the rear duct 22, and a pair of sliding rods arranged in parallel on both sides of the air cylinder 38. 3
9 and a guide 40 fixed to the upper surface of the front duct 21 and slidably supporting each sliding rod 39.
One end of the sliding rod 39 is connected to the rear duct 22. By moving the air cylinder 38 in and out, the rear duct 22 can be expanded and contracted and the turning radius of the dust collecting hood 10 can be changed to be large or small. Reference numeral 59 denotes a dust cover.

The dust collecting hood 9 is a truncated conical umbrella hood formed by joining stainless steel plates, and the upper end thereof is fixed to the lower surface of the protruding end of the rear duct 22. As shown in FIG. 9, escape grooves 42, 43 are opened at two locations before and after the inclined hood wall 41, and each of the escape grooves 42, 43 can be opened and closed by lids 44, 45 from the outer surface side of the groove. ing.
Both escape grooves 42 and 43 are provided in order to avoid interference with the suspension 6 for the ladle 2, and one of the escape grooves 43 interferes with the suspension 6 for the material input device 46 shown in FIG. Also serves as a groove to avoid. Each of the escape grooves 42 and 43 is formed in an upper tapered shape from the lower peripheral edge to the vicinity of the upper peripheral edge of the hood wall 41.

The lids 44 and 45 are hinges 4 provided above and below the side edges.
It is swingably openable and closable via 7, and is urged to close by a spring (not shown). These lids 44, 4
A lid opening / closing mechanism is provided to open and operate 5 against the spring. The lid opening / closing mechanism is provided with two air cylinders 48 and 49 on the upper surface of the protruding end of the rear duct 22, and is configured to be able to transmit the retracting operation to the lids 44 and 45 via the wire 50. The wire 50 is guided by a freely rotatable reel 51 to be led out to the hood wall 41, and its tip is connected to each of the lids 44 and 45.

Next, the usage of the dust collector in each work process will be described. At the time of material input, a material input device (electromagnetic lift) 46 using an electromagnet is used (FIG. 10A).
(See FIG. 10B) and a case where a charging car 54 having a built-in belt conveyor 53 is used (see FIG. 10B).
In the former case, after the rear lid 45 is opened to open the escape groove 43, the movable duct 9 is turned rearward by the turning mechanism 23, and the rear duct 22 is adjusted to extend and retract by the extension mechanism 24. The position of the rear escape groove 43 is set to the suspension 6 of the material input device 46.
, So that the hanging body 6 can be inserted deep inside. In this state, the elevating mechanism 13 is operated to move the movable duct 9 downward to bring the dust collecting hood 10 as close as possible to the electromagnet. Since the dust collecting hood 10 is formed of a stainless steel plate, it is not absorbed by the electromagnet.

When the power supply to the electromagnet is stopped in the above state, the raw material falls into the furnace, and the impact generates dust.
Dust rising from the furnace is sucked into a dust collecting hood 10 covering most of the furnace opening. Thereafter, the raw material input device 46
Is repeatedly performed. Meanwhile, the dust collection hood 10 is kept at the above-described dust collection position.

When charging the raw material using the charging car 54, the lifting duct 12 is raised and the dust collecting hood 10 is moved into the charging chute 5 with the lids 44 and 45 closed.
5 and sucks and removes dust that rises inside the charging chute 55. In this case, since the dust rises along the charging chute 55 due to the upward airflow generated in the furnace by continuously charging the raw materials, most of the dust can be sucked by the dust collecting hood 10. At this time, the charging chute 55 exhibits a chimney effect and efficiently guides the dust toward the dust collecting hood 10.

At the time of melting, as shown in FIG. 4, the dust collecting hood 10 is brought as close as possible to a position right above the furnace opening to suck and remove fumes and harmful gases generated at the time of melting. At this time,
The fumes and harmful gases naturally move upward on the convective hot airflow, and then are trapped in the dust collection airflow in the dust collection hood 10, so that the heat in the furnace can be prevented from being wasted. The heat loss of the melting furnace 1 can be sufficiently suppressed as compared with a conventional melting furnace in which dust is forcibly collected by using a furnace lid as a dust collecting hood. Further, the air volume for dust collection can be reduced by about 30%.

At the time of normal tapping, as shown in FIG. 2, the front lid 44 is opened, and the position of the dust collecting hood 10 is adjusted so that the hanging body 6 of the ladle 2 enters the inside of the escape groove 42. A dust collecting hood 10 covers an area above the tap 4 and the ladle 2 where fumes and the like are likely to be generated. Also in this case, the center of the escape groove 42 is matched with the moving direction of the hanging body 6 to facilitate the moving operation of the ladle 2 by the overhead traveling crane.

When the melting is completed and the remaining hot water is discharged,
The melting furnace 1 is raised and tilted from the melting position to 95 °. To avoid this, the dust collection hood 10
As shown in (a), the ladle 2 is covered from the front side with the hanging body 6 entering the rear escape groove 43. Melting furnace 1
With the tilting, the deck 36 also stands upright and approaches the movable duct 9. However, since the front duct 21 is bent in a substantially L-shape in plan view, the movable duct 9 can bypass the side edge of the deck 36, and the two ducts 9 and 36 do not interfere with each other.

In some melting furnaces, tapping may be performed by disposing a runner 56 between the melting furnace 1 and the ladle 2, as shown in FIG. 11 (b). In this case, the position of the dust collecting hood 10 is adjusted so as to cover the upper part of the runner 56 and the ladle 2, and the dust is collected in a state where the hanging body 6 enters the front escape groove 42. Thereby, most of the harmful dust generated from the runner 56 and the ladle 2 can be removed. In a case where hot water from the melting furnace 1 is received in a pot and then discharged to the ladle 2 via a runner, dust collection can be performed in a similar manner. As described above, according to the dust collecting apparatus of the present invention, harmful dust generated from the melting furnace 1, the ladle 2, and the like can be reliably removed by suction in a series of work steps from the input of the raw material to the discharge of the residual hot water.

FIG. 12 shows another embodiment of the lids 44 and 45.
Here, the lids 44 and 45 are provided so as to close most of the escape grooves 42 and 43 except for a part of the upper ends of the escape grooves 42 and 43.
According to such a lid structure, after the hanging body 6 enters the upper ends of the escape grooves 42, 43, the lid opening / closing mechanism is operated to operate the lids 44, 4.
5 can be closed and external air can be prevented from being sucked from the escape grooves 42 and 43. That is, suction loss from the escape grooves 42 and 43 can be prevented.

FIG. 13 shows still another embodiment of the lid structure, which differs from the above-described embodiment in that the escape grooves 42, 43 can be opened and closed by upper lids 42a, 43a and lower lids 42b, 43b. . The lower lids 42b and 43b correspond to the lids 44 and 45 described in FIG. 12, respectively, and can be automatically opened and closed by a lid opening and closing mechanism. Similarly, the upper lids 42a and 43a can be automatically opened and closed by the lid opening and closing mechanism. According to this lid structure, the entirety of the escape grooves 42, 43 during melting or the like is transferred to the upper lids 42 a, 43 a and the lower lid 4.
It can be closed by 2b and 43b, and only the upper lids 42a and 43a can be opened at the time of material input or tapping, so that suction loss can be prevented.

In the above-described embodiment, the motor 14 and the screw jack 15 are used as the driving sources of the elevating mechanism 13, but this is not necessary. For example, a hydraulic cylinder or an air cylinder can be used. Similarly, a hydraulic cylinder or a motor cylinder can be applied as a drive source of the turning mechanism 23 or the extension mechanism 24. Air cylinder 4 for lid opening and closing mechanism
8 and 49 can apply a solenoid or a rotary solenoid. The base duct 8 can be suspended and supported from the ceiling side.
The lids 44 and 45 are opened and closed by swinging up and down.
1 may be slid open and closed. It is possible to adopt a two-sided open lid structure. In some cases, lids 44, 45
Can be omitted. The dust collecting hood 10 does not need to be umbrella-shaped, and can be changed to a truncated pyramid or a box. Dust collection hood 10
Is provided so as to be able to rotate horizontally with respect to the rear duct 22, one escape groove can be omitted.

[0033]

According to the dust collecting apparatus of the present invention, the melting furnace 1 is used in all the melting operation steps from the input of the raw material to the tapping.
The harmful dust generated from the ladle 2 can be efficiently removed by a single dust collector with a smaller air volume, and the working environment can be maintained in a suitable state. The dust collecting hood 10 is moved to the optimum dust collecting position to remove the harmful dust in accordance with the occurrence position of the harmful dust in each work process, so that the position of the conventional dust collecting hood is fixed. Compared to the dust collector, dust can be collected more efficiently, and the cost and running cost required for introducing the entire device can be reduced. Since the harmful dust generated in each work process is removed by only one system of dust collector, the floor area required for the installation is small, and it is advantageous in that the existing melting furnace can be additionally installed without any problem.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a dust collector.

FIG. 2 is a vertical sectional side view showing a dust collecting mode at the time of tapping.

FIG. 3 is a plan view in the state of FIG. 2;

FIG. 4 is an overall front view of the dust collector.

FIG. 5 is a vertical sectional view showing details of a lifting mechanism.

FIG. 6 is a longitudinal sectional view showing a swiveling structure of a movable duct.

FIG. 7 is a plan view showing a turning mechanism.

FIG. 8 is a plan view showing a telescopic mechanism.

FIG. 9 is a plan view showing a lid opening / closing mechanism.

FIG. 10 is a side view showing a dust collection mode when a raw material is charged.

FIG. 11 is a side view showing a form of dust collection at the time of tapping.

FIG. 12 is a front view showing another embodiment of the lid structure.

FIG. 13 is a front view showing still another embodiment of the lid structure.

[Explanation of symbols]

1 ... melting furnace, 2 ... ladle, 6 ... hanging body, 8 ...
... Base duct, 9 movable duct, 10 dust collecting hood, 13 elevating mechanism, 21 front duct,
22: Rear duct, 23: Swivel mechanism, 24:
… Expansion mechanism, 42… Escape groove (front), 43… Escape groove (rear), 44… Lid (front), 45… Lid (rear)

Claims (5)

[Claims] 1. A base duct 8 which is arranged on one side of a hot water tilting area of a melting furnace 1 and is connected to a dust collection source, and is movable so as to project upward from the melting furnace 1 continuously with the base duct 8. Duct 9
And a dust collecting hood 10 fixed to the protruding end of the movable duct 9. The movable duct 9 is pivotally supported by the base duct 8, and the dust collecting hood 10 is located above the melting furnace 1 and above the ladle 2. The movable duct 9 is provided with a front duct 2 connected to the base duct 8 so as to be able to reciprocate between the movable duct 9 and the base duct 8.
1, a rear duct 22 supported by the front duct 21 so as to be able to move back and forth, and provided between the front and rear ducts 21 and 22;
A telescoping mechanism 24 for moving the rear duct 22 in and out; and a hood wall 41 of the dust collecting hood 10, an escape groove 42 for avoiding interference with the raw material input device 46 and the hanging body 6 for the ladle 2. 43
Dust collector for melting furnace with open. 2. A base duct 8 comprising: a fixed duct 11; an elevating duct 12 supported by the fixed duct 11 so as to be movable up and down;
A lid (4) provided between the fixed duct (11) and the elevating duct (12) to lift and lower the elevating duct (12);
The dust collector according to claim 1, wherein the movable duct (9) is provided with a lid opening / closing mechanism for opening and closing the lids (44, 45). 3. A base duct 8 is erected and fixed at a corner of a retaining wall facing a furnace pit and a ladle pit. One of the front duct 21 and the rear duct 22 of the movable duct 9 is connected to the melting furnace 1. The bent portion is formed in a substantially L-shape in a plan view, avoiding the tapping tilt region.
A dust collector for a melting furnace as described in the above. 4. The dust collecting hood 10 is formed in an umbrella shape, and escape grooves 42, 43 are opened from the lower peripheral edge to the vicinity of the upper peripheral edge of the hood wall 41, and the lids 44, 45 are provided with the escape grooves 42, 43. 43 is provided so as to close most of the escape grooves 42 and 43 except for a part of the upper end side of the escape groove 43.
4. The escape grooves 42, 43 can be closed by the lids 44, 45 in a state where they are located at the upper ends of the grooves 2, 43. 5.
A dust collector for a melting furnace as described in the above. 5. Dust collecting hood 10 includes upper lids 42a, 43a for opening and closing upper ends of escape grooves 42, 43, and escape grooves 42, 43.
4. A lower cover 42b, 43b for opening and closing the other part of the cover is provided, and each of the upper cover 42a, 43a and the lower cover 42b, 43b can be individually opened and closed by a cover opening / closing mechanism. Dust collector for melting furnace.