Ring hood and dust collector

Abstract

To provide a ring hood or the like that can improve dust collection efficiency. [Solution] The ring hood 3 is positioned around the opening of the melting furnace 1 that stores molten metal and comprises a main body portion 30 having an opening above the outlet 13 of the melting furnace 1, and a shielding portion 35 that covers at least a part of the opening.

Description

Technical Field

[0001] The present invention relates to a ring hood provided in a furnace for storing hot water and a dust collection device including the ring hood.

Background Art

[0002] As a dust collection device for collecting dust such as fumes and gas soot, there has been proposed "a dust collection device for an electric furnace provided with a ring hood around an opening 5 of an electric furnace 1 having a furnace lid 4 that can be opened and closed and moved freely, and connecting the ring hood 2 to a dust collector 3, wherein the central opening 2A of the ring hood 2 is enlarged so that the furnace lid 4 of the electric furnace 1 can enter from above the ring hood 2 and reach the opening 5 of the electric furnace 1, and the opening 5 of the electric furnace 1 can be directly closed by the furnace lid 4" (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Even in the above dust collection device, although dust can be collected, there is a desire to further improve the dust collection efficiency. An object of the present invention is to provide a ring hood and a dust collection device capable of enhancing the dust collection efficiency.

Means for Solving the Problems

[0005] The ring hood according to the present invention includes a main body portion disposed around an opening of a melting furnace for storing molten metal and having an opening above the molten metal outlet of the melting furnace, and a shielding portion that closes at least a part of the opening. The dust collection device according to the present invention comprises a ring hood and a suction means communicating with the ring hood, wherein the ring hood is the ring hood described above. [Effects of the Invention]

[0006] The above configuration makes it possible to improve dust collection efficiency. [Brief explanation of the drawing]

[0007] [Figure 1] This is a view from above of a dust collection device according to an embodiment. [Figure 2] This diagram shows the dust collector viewed from a direction perpendicular to the direction in which the hot water outlet extends. [Figure 3] This diagram shows a cross-section of a dust collector, cut by a virtual plane along the direction in which the hot water outlet extends, viewed from a direction perpendicular to the direction in which the hot water outlet extends. [Figure 4] This is a perspective view of a melting furnace with a dust collection device installed. [Figure 5] This is a view from above of the hood body with the central opening in the open position. [Figure 6] This is a diagram of a melting furnace, where (a) is a view from above, and (b) is a view of a cross-section cut by a virtual plane along the direction in which the spout extends, as seen from a direction perpendicular to the direction in which the spout extends. [Figure 7] This is a diagram of the hood body, where (a) is a view from above, (b) is a view from the direction in which the upper and lower openings extend, and (c) is a view from below. [Figure 8] These are diagrams of the shielding body, where (a) is a view from above, (b) is a view from the direction in which the upper opening extends, and (c) is a view from a direction perpendicular to the direction in which the upper opening extends. [Figure 9] This diagram illustrates the hot water supply state, and shows that a shielding element is provided on the hood body. [Figure 10] This diagram illustrates the hot water supply situation, and shows no shielding material installed on the hood itself. [Figure 11]The diagram shows modified versions of the ring hood, where (a) the lid slides and (b) the lid moves up and down. [Modes for carrying out the invention]

[0008] <Overview> The first ring hood according to this embodiment comprises a main body portion that is positioned around the opening of a melting furnace for storing molten metal and has an opening above the outlet of the melting furnace, and a shielding portion that covers at least a part of the opening. This makes it possible to improve dust collection efficiency. The second ring hood according to the embodiment is a first ring hood in which the main body comprises an upper wall having an upper opening in a portion corresponding to the opening, a lower wall having a lower opening in a portion corresponding to the opening, and a peripheral wall connecting the outer edges of the upper wall and the lower wall, and the shielding portion is provided to close the upper opening of the upper wall. This makes it possible to provide a shielding portion with a simple structure. The third ring hood according to the embodiment is a first or second ring hood in which the main body is formed in the center and has a central opening, the central opening is opened and closed by a lid that moves by an opening and closing mechanism, and the shielding portion is configured such that the edge on the central opening side follows the movement trajectory of the lid. This makes it difficult for the shielding portion and the lid to interfere with each other.

[0009] <Embodiment> 1. Overall As shown in Figure 1, the dust collector 2 is installed in the melting furnace 1, which melts metals such as iron and cast metal. The melting furnace 1 stores the molten metal and dispenses it into a ladle 6, for example. During dispensing, dust and gases such as fumes (hereinafter referred to as "dust, etc.") are generated from the surface of the molten metal in the melting furnace 1 and from the ladle 6, and these dust, etc. are sucked up by the dust collector 2. Dispensing is performed by tilting the melting furnace 1, as shown in Figures 9 and 10. In this specification, the vertical direction is based on the state before the melting furnace 1 is tilted (the state in FIG. 2). That is, the direction perpendicular to the liquid surface of the molten metal in the melting furnace 1 before tilting is defined as the vertical direction, the bottom side of the melting furnace 1 is the lower side, and the side opposite to the bottom (the opening side) is the upper side. Moreover, FIG. 4 is a drawing closer to the actual machine, and the other drawings are schematic drawings for explaining the invention. Hereinafter, each part will be described.

[0010] 2. Each Part (1) Melting Furnace For the melting furnace 1, for example, an electric furnace, a high-frequency induction furnace, etc. can be used. Here, a high-frequency induction furnace is used. As shown in FIGS. 3 and 6, the melting furnace 1 has a bottomed cylindrical shape and includes a high-frequency coil (not shown) on the peripheral wall 11. The melting furnace 1 has a storage part 12 for storing molten metal inside, and a tapping port 13 on the upper part of the peripheral wall 11. The tapping port 13 extends to the outer side in the radial direction of the peripheral wall 11. The tapping port 13 is configured to incline upward (see FIG. 6(b)) and narrow in width (see FIG. 6(a)) as it moves away from the storage part 12 in the radial direction. The melting furnace 1 has a flange part 14 that projects radially from the upper end of the peripheral wall 11. As shown in FIGS. 2 and 3, the ring hood 3 of the dust collecting device 2 is mounted on the upper surface of the flange part 14 via a fixing plate 7.

[0011] (2) Dust Collecting Device As shown in FIGS. 1 and 2, the dust collecting device 2 includes at least a ring hood 3 and a suction means (not shown). The dust collecting device 2 here includes an opening / closing means 4 that opens and closes a central opening formed in the center of the ring hood 3 with a lid body 5.

[0012] The ring hood 3 is arranged around the opening 12a at the upper part of the melting furnace 1 as shown in FIGS. 1 to 3. The ring hood 3 includes a hood body 30 and a shielding body 35 as shown in FIGS. 1 to 4. Here, the hood body 30 and the shielding body 35 are configured separately. The hood body 30 corresponds to an example of the "main body part" of the present invention, and the shielding body 35 corresponds to an example of the "shielding part" of the present invention.

[0013] (2-1) Hood body As shown in FIGS. 3 and 7, the hood body 30 includes an upper wall 31, a lower wall 32, and a peripheral wall 33. As shown in FIGS. 7(a), (b) and 3, the upper wall 31 has a central opening 31a located above the opening 12a (see FIG. 6(b)) of the melting furnace 1 and an upper opening 31b located above the hot water outlet 13 of the melting furnace 1. Here, the central opening 31a and the upper opening 31b are continuous. The central opening 31a is substantially circular (accurately, it is not circular because it is connected to the upper opening 31b). The upper opening 31b is provided so as to extend in the radial direction from the central opening 31a. The upper opening 31b is formed such that the opening width decreases as it moves away from the central opening 31a. Thereby, the sealing property inside the hood body 30 can be enhanced. As shown in FIGS. 7(a), (b), 2 and 3, the upper wall 31 has raised portions 31c, 31d that bulge upward at a portion adjacent to the upper opening 31b. The raised portions 31c, 31d are provided on the side opposite to the central opening 31a in the upper opening 31b. The raised portions 31c, 31d bulge upward in an inclined shape as they go from the central opening 31a side toward the end of the upper opening 31b (in other words, as they move away from the central opening 31a). When viewed from above, the outer peripheral edge of the upper wall 31 has an arc shape on one side and a shape similar to a rectangle on the other side (the suction means side) with respect to the virtual line L1 connecting the center of the central opening 31a and the center in the width direction of the upper opening 31b. As shown in FIG. 4, the upper wall 31 is provided with a cleaning opening 31g, which is normally blocked by a plate material or the like.

[0014] As shown in FIGS. 7(c) and 3, the lower wall 32 has a central opening 32a located above the opening 12a of the melting furnace 1 and a lower opening 32b located above the hot water outlet 13 of the melting furnace 1. Here, the central opening 32a and the lower opening 32b are continuous. The central opening 32a is roughly circular in shape (more precisely, not perfectly circular because it is connected to the lower opening 32b). The lower opening 32b is provided so as to extend radially from the central opening 32a. The lower opening 32b is formed such that its opening width decreases as it moves away from the central opening 32a. This improves the airtightness inside the hood body 30. When viewed from below, the outer edge of the lower wall 32 has a shape that resembles an arc on one side and a rectangle on the other side (the side with the suction means) with respect to a virtual line L2 connecting the center of the central opening 32a and the center of the lower opening 32b in the width direction. Furthermore, the upper wall 31 and the lower wall 32 have similar shapes when viewed from above or below.

[0015] As shown in Figures 7(b) and 3, the peripheral wall 33 connects the outer edge of the upper wall 31 and the outer edge of the lower wall 32, with some exceptions. These exceptions are the side portions 31e and 32e that form a rectangular shape when viewed from above and below, on the other side of the imaginary lines L1 and L2. The side portions 31e and 32e that are not connected by the peripheral wall 33 are connected to suction ducts that are connected to suction means (not shown).

[0016] (2-2) Shielding body As shown in Figure 5, the shielding body 35 covers at least a portion of the opening in the hood body 30, that is, the upper opening 31b of the upper wall 31. Here, the upper opening 31b covers the tip side of the molten metal outlet 13 of the melting furnace 1 (the end opposite to the central opening 31a). In other words, the upper opening 31b covers the side opposite to the central opening 31a. The shielding body 35 is composed of, for example, a plate member formed by pressing a single metal plate. The plate member is also denoted by the symbol "35". As shown in Figure 5, the plate member 35 comprises a pair of fixed portions 351 and 352 fixed to adjacent portions of the hood body 30 adjacent to the upper opening 31b, a pair of extended portions 353 and 354 extending upward from the fixed portions 351 and 352, and a covering portion 355 that connects the upper ends of the pair of extended portions 353 and 354 and covers the upper opening 31b. Here, as shown in Figure 1, an arm 41 with a cover 5 at one end rotates around a rotation axis C1, and the plate member 35 is provided outside the outermost rotational trajectory L3 of the cover 5. For this reason, the fixed portion 351, the extended portion 353, and the covering portion 355 are provided so as to straddle the raised portion 31c of the hood body 30 and the flat portion 31f (see Figure 7(a)) located on the central opening 31a side relative to the raised portion 31c. This makes it possible to widen the area that covers the upper opening 31b of the upper wall 31 and improve the airtightness inside the hood body 30.

[0017] As shown in Figure 8, the fixing portion 351 has a raised-side fixing portion 351a that abuts against the raised portion 31c and a flat-side fixing portion 351b that abuts against the flat portion 31f. The fixing portion 352 abuts against the raised portion 31d and can also be called the raised-side fixing portion. The fixing portions 351 and 352 can be fixed by, for example, welding, screws (bolts), rivets, etc. Furthermore, by making the shielding body 35 detachable with screws, etc., maintenance of the melting furnace outlet 13 can be easily performed. The extended portion 353 has a raised-side extended portion 353a that is erected upward from the upper opening 31b side edge of the hood body 30 in the raised-side fixing portion 351a, a flat-side extended portion 353b that is erected upward from the upper opening 31b side edge of the hood body 30 in the flat-side fixing portion 351b, and an inner extended portion 353c that protrudes inward (towards the central opening 31a) from the central opening 31a side edge of the flat-side extended portion 353b. The extended portion 354 is erected upward from the upper opening 31b side edge of the hood body 30 in the raised-side fixing portion 352, and can also be called the raised-side extended portion.

[0018] As shown in Figure 8, the covering portion 355 has a raised-side covering portion 355a that covers the raised side of the hood body 30 and a flat-side covering portion 355b that covers the flat side of the hood body 30, and is located above the upper opening 31b. The edge of the flat-side covering portion 355b on the side of the central opening 31a has a shape that matches the outermost rotational trajectory L3 of the lid 5, in this case it is arc-shaped, as shown in Figure 1. As shown in Figures 8(c) and 3, the raised covering portion 355a is inclined upward as it moves away from the central opening 31a, similar to the raised portions 31c and 31d (see Figure 7). The flat covering portion 355b is parallel to the upper wall 31. As shown in Figure 3, the covering portion 355 is provided at an upper distance from the upper wall 31 of the hood body 30. This widens the space between the covering portion 355 and the outlet 13 of the melting furnace 1, allowing dust and other particles generated from the ladle 6 to be sucked up over a wide area when the molten metal is poured into the ladle 6.

[0019] (3) Opening and closing means As shown in Figures 1 and 2, the opening / closing mechanism 4 includes an arm 41 extending along the upper surface (upper wall 31) of the ring hood 3, a rotational drive mechanism (not shown) for rotating the arm 41 with the vertical direction as the axis of rotation C1, and a lifting drive mechanism (not shown) for raising and lowering the tip of the arm 41. A cover 5 that closes the central opening 31a of the upper wall 31 of the ring hood 3 is provided at one end of the arm 41. The other end of the arm 41 is supported by a support so that it can rotate with respect to a rotation axis perpendicular to the vertical direction. The rotational drive means rotates the support part around the rotation axis C1. Here, as shown in Figure 1, the lid 5 rotates between a "first position" where it is located outside the ring hood 3 and a "second position" where it is located on the central opening 31a of the ring hood 3. For example, a motor, cylinder, etc., can be used as the rotational drive means. The lifting drive mechanism drives the base of the arm 41 up and down. For example, a cylinder that extends and retracts in the vertical direction can be used as the lifting drive mechanism. As shown in Figure 3, the lid 5 has a fitting portion 51 that fits into the central opening 31a of the upper wall 31 of the ring hood 3, and a flange portion 52 that protrudes radially outward from the upper end of the fitting portion 51. This improves the airtightness inside the hood body 30 when the lid 5 closes the central opening 31a of the upper wall 31. The lid 5 opens, for example, when a metal ingot is placed into the melting furnace 1, and closes once the ingot is placed inside.

[0020] 3. Dust suction during hot water dispensing This will be explained using Figures 9 and 10. Figure 9 shows a shielding element 35 attached to the hood body 30, while Figure 10 shows no shielding element attached to the hood body 30. This is the only difference between the two; the other configurations are the same. Figures 9 and 10 schematically show how the molten metal 9 inside the furnace is poured into the ladle 6 by tilting the melting furnace 1 with a rotation axis perpendicular to the plane of the paper. Arrow A in the diagram indicates how dust and other particles generated from the molten metal 9 in the ladle 6 are sucked into the hood body 30 by the drive of the suction means (movement). The opening above the outlet 13 of the melting furnace 1 that sucks the material into the hood body 30 is called the suction port 30a. Furthermore, the area enclosed by the dashed line in the figure represents the air C above the upper opening 31b of the hood body 30 or the shielding body 35, and arrow B indicates how the air C is drawn into the hood body 30 (movement).

[0021] (1) When there is a shielding (Figure 9) In Figure 9, a shielding body 35 is provided above the upper opening 31b of the upper wall 31. This improves the airtightness inside the hood body 30 and increases the suction power. The suction port 30a consists of two openings: one between the upper wall 31 and the lower wall 32 of the hood body 30, and another between the covering portion 355 of the shielding body 35 and the upper wall 31 of the hood body 30. Therefore, dust and other particles can be sucked up from the suction port 30a from a wide area, including the area away from the molten metal 9 from which it is being dispensed (the arrow on the left in Figure 9). Furthermore, the air C above the upper opening 31b is less likely to be drawn into the hood body 30 because the upper opening 31b is covered by the shielding body 35.

[0022] (2) When there is no shielding (Figure 10) In Figure 10, since no shielding body 35 is provided, the suction port 30a consists only of an opening between the upper wall 31 and the lower wall 32 of the hood body 30 (see Figure 7). Therefore, dust and other particles in the area close to the molten metal 9 that is being dispensed (the right arrow in Figure 10) are sucked in through the suction port 30a. On the other hand, the air C above the upper opening 31b is drawn into the hood body 30 as shown by arrow B, because there is no shielding body 35 and the upper opening 31b is exposed. Dust that is not sucked in by the suction port 30a of the hood body 30, and is located in an area away from the molten metal 9 being discharged (left arrow in Figure 10), rises and is drawn into the hood body 30 along with the air C as shown by arrow B.

[0023] (3) Comparison The airtightness inside the hood body 30 is higher when the shielding body 35 is present, as shown in Figure 9, compared to when the shielding body 35 is absent, as shown in Figure 10. Furthermore, by providing the shielding body 35, the air C above the upper opening 31b of the hood body 30 is less likely to be drawn into the hood body 30, as shown in Figure 9. In this way, by providing the shielding body 35, the suction force is increased, and the suction of air C and other particles above the upper opening 31b is reduced. As a result, the amount of dust A generated in the ladle 6 can be increased, and a large amount of dust A can be sucked up. Furthermore, it has been confirmed that when the shielding body 35 is installed, the same amount of dust and other particles can be sucked up at 70% of the suction volume when the shielding body 35 is not installed.

[0024] Although embodiments have been described above, the invention is not limited to these embodiments, and may be modified in the following ways, for example. Furthermore, embodiments may be combined with modifications, or modifications may be combined with each other. Furthermore, examples not described in the embodiments or modifications, as well as design changes that do not depart from the gist of the invention, are also included in the present invention.

[0025] <Variation> 1. Shielding body (1) In the embodiment, the shielding body 35 is constructed separately from the hood body 30 and is fixed to the hood body 30 in a manner that is either detachable or detachable, but it may also be constructed integrally with the hood body. In this case, the ring hood has a main body portion corresponding to the hood body 30 and a shielding portion corresponding to the shielding body 35. (2) The covering portion 355 of the shielding body 35 is provided at an upper distance from the upper wall 31 of the hood body 30, but the upper surface of the covering portion 355 may be substantially flush with the upper surface of the upper wall 31, the lower surface of the covering portion 355 may be substantially flush with the upper surface of the upper wall 31, or the upper surface of the covering portion 355 may be substantially flush with the lower surface of the upper wall 31. In this context, "almost level" includes cases where there is no difference in height between the two surfaces, and cases where there is a difference in height between the two surfaces that does not pose a problem for practical use. (3) The shielding body 35 is provided on the upper surface of the upper wall 31 (the surface opposite to the lower wall 32), but it may also be provided on the lower surface of the upper wall 31 (the surface on the side of the lower wall 32). (4) The shielding body 35 was provided on the hood body 30, but it may also be provided on the lid 5 that opens and closes the central opening 31a of the hood body 30. In this case, the lid has an opening / closing part that opens and closes the central opening, and a shielding part that extends from the opening / closing part along the upper opening and shields the upper opening. (5) The shielding body 35 is provided so as to cover a part of the upper opening 31b, but it may also be provided so as to cover the entire upper opening 31b.

[0026] 2. Hood body (main body) (1) The hood body 30 has raised portions 31c and 31d on the side opposite to the central opening 31a in the upper opening 31b, but it is also possible to omit the raised portions 31c and 31d and have the shielding body 35 have portions corresponding to the raised portions 31c and 31d. (2) The hood body 30 is configured such that the central opening 31a and the upper opening 31b are continuous in the upper wall 31, and the central opening 32a and the lower opening 32b are continuous in the lower wall 32. However, the central opening 31a and the upper opening 31b, and the central opening 32a and the lower opening 32b may be configured independently so that at least one of them is not continuous. (3) Upper opening and lower opening When viewed from above, the upper opening 31b and the lower opening 32b extend radially from the central openings 31a and 32a, and the opening width (circumferential dimension of the opening) decreases as they approach the extension end. However, the opening width may increase as it approaches the extension end, or it may remain constant even as it approaches the extension end. Furthermore, the upper opening 31b and the lower opening 32b have the same size and shape when viewed from above, but their size and shape may differ. For example, the opening area of ​​the upper opening 31b may be larger than the opening area of ​​the lower opening 32b, or the opening width of the upper opening 31b may change along the radial direction, while the opening width of the lower opening 32b may not change along the radial direction.

[0027] 3. Operation of the lid and shielding As shown in Figure 1, the cover 5 is attached to one end of the arm 41, and the arm 41 rotates around the rotation axis C1 to close the central opening 31a of the hood body 30. The edge of the covering portion 355 of the shielding body 35 on the side of the central opening 31a is arc-shaped to match the outermost trajectory of the cover 5 in order to prevent interference with the rotating cover 5. However, the opening and closing operation of the central opening 31a of the lid 5 is not limited to rotational movement. For example, as shown in Figure 11(a), the motion may be linear, in which case the edge 1355a of the covering portion 1355 of the shielding body 1035 on the side of the central opening 31a may be made linear to match the linear trajectory of the cover body 5. Furthermore, as shown in Figure 11(b), the central opening 31a may be approached from above (in the direction perpendicular to the surface where the central opening 31a is formed). In this case, the edge 2355a of the covering portion 2355 of the shielding body 2035 on the central opening 31a side may be shaped to match the outer circumference shape of the cover 5 (in this case, an arc shape). Furthermore, when the lid performs linear motion (sliding motion) or vertical linear motion (lifting and lowering motion), the external shape of the lid may be circular, elliptical, polygonal (including rectangular and square shapes), similar shapes, or combinations thereof.

[0028] 4. Dust collector The dust collector 2 only needs to include at least a ring hood 3 with a shielding body 35 provided on the hood body 30, and a suction means. For example, a filter may be provided in the suction path between the ring hood and the suction means, or a damper may be provided to adjust the amount of suction. Furthermore, the dust collector 2 may be equipped with an opening / closing mechanism 4 for opening and closing the central opening 31a of the ring hood 3 with a cover 5, or the opening / closing mechanism 4 may be included in another device other than the dust collector 2, or it may be an opening / closing mechanism independent of the dust collector 2. [Explanation of symbols]

[0029] 1. Melting furnace 2. Dust collector 3 Ring Hood 4. Opening and closing means 5. Lid 30 Hood body (main body) 31a center opening 31b Upper opening (opening) 35 Shielding body (shielding part)

Claims

1. A main body portion is positioned around the opening of a melting furnace for storing molten metal and has an opening above the outlet of the melting furnace, A shielding portion that covers at least a part of the opening and Equipped with, Ring hood.

2. The main body is, An upper wall having an upper opening in the portion corresponding to the aforementioned opening, A lower wall having a lower opening in the portion corresponding to the aforementioned opening, A peripheral wall connecting the outer edges of the upper wall and the lower wall Equipped with, The shielding portion is provided so as to close the upper opening of the upper wall. The ring hood according to claim 1.

3. The main body is formed in the center and has a central opening. The aforementioned central opening is opened and closed by a lid that moves by an opening and closing mechanism. The shielding portion is configured such that its edge on the central opening side follows the movement trajectory of the lid. The ring hood according to claim 2.

4. Ring hood and, A suction means communicating with the ring hood Equipped with, The ring hood is the ring hood described in any one of claims 1 to 3. Dust collector.

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