Mobile dust collector

Abstract

To provide a mobile dust collector that can efficiently collect fumes generated when cutting steel materials. [Solution] The mobile dust collector 1 comprises a dust collection hood 40 located near the steel material W to be cut and sucking up fumes generated during cutting, a suction duct 30 connected to the dust collection hood 40, a dust collector 23 connected to the end of the suction path formed by the suction duct 30, and a trolley 3 that moves along a transport track 14 to move the dust collection hood 40 and the dust collector 23 together.

Description

Technical Field

[0001] The present invention relates to a mobile dust collection device used for dust collection of fumes generated when cutting steel materials.

Background Art

[0002] In a steelmaking plant or the like, rolling rolls, blooms, etc. (hereinafter collectively referred to as "return materials") as waste materials generated when newly manufacturing alloy materials or products are gas-cut to a size that can be charged into an electric furnace (for example, about 1.5 m in length) for remelting in an electric furnace. Since fumes are generated during gas cutting, it is necessary to collect the fumes in order to prevent deterioration of the surrounding environment. Here, in order to efficiently collect fumes when cutting return materials arranged over a wide outdoor area, it is necessary to arrange a dust collection hood that sucks in the fumes generated during cutting at an appropriate position, and to suppress the pressure loss in the suction path extending from the dust collection hood to maintain a high dust collection capacity.

[0003] As a dust collection device used when cutting a steel material to be cut such as a return material, there is, for example, one described in Patent Document 1 below. In this Patent Document 1, a dust collection hood that covers the working space during gas cutting, a crane hanger provided on the upper surface of the dust collection hood, a telescopic suction duct having one end attached to the central portion of the upper surface of the dust collection hood, and an external dust collector attached to the other end of the suction duct are provided. A dust collection device has been proposed. However, the dust collection device described in Patent Document 1 has to move the dust collection hood and the suction duct each time using a mobile jib crane according to the cutting work place. At that time, it is difficult to finely adjust the installation position of the dust collection hood, and there is a concern about a decrease in dust collection efficiency. In addition, if a wide movable range is to be secured, the length of the suction duct has to be increased, and the pressure loss increases accordingly, resulting in a decrease in the dust collection capacity.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Japanese Patent Publication No. 2011-21800 [Overview of the project] [Problems that the invention aims to solve]

[0005] Against the background described above, the present invention aims to provide a mobile dust collector that can efficiently collect fumes generated when cutting steel materials. [Means for solving the problem]

[0006] The mobile dust collector in the first aspect of this invention is defined as follows: A dust collection hood located near the steel material being cut to suck up fumes generated during cutting, A suction duct connected to the dust collection hood, A dust collector connected to the end of the suction path formed by the aforementioned suction duct, A trolley that moves along a transport track to move the dust collection hood and dust collector as a single unit, It is equipped with.

[0007] According to this defined mobile dust collector, the dust collection hood can be moved over a wide area along the transport track, allowing dust collection to be performed at any location in the steel material storage area. In this case, since the dust collection hood and the dust collector move together, even if a wide range of movement for the dust collection hood is ensured, the length of the suction path between the dust collection hood and the dust collector remains constant, thus avoiding the problem of reduced dust collection capacity caused by the range of movement of the dust collection hood.

[0008] The second aspect of this invention is defined as follows: In the first phase, the mobile dust collector has side walls erected on the trolley and surrounding the trolley in a circumferential direction, and a roof that closes the area enclosed by the side walls from above, and the dust collection hood is provided in the indoor area enclosed by these side walls and roof. According to this second phase, since dust collection is performed in the indoor area enclosed by the side walls and roof, it is possible to avoid deterioration of dust collection efficiency caused by outdoor weather conditions, etc.

[0009] The third aspect of this invention is defined as follows: In the first aspect of the specified mobile dust collector, the dust collection area within the dust collection hood is divided into a central area facing the suction port of the suction duct and a lateral area separated from the central area by a partition plate, and the lateral area is configured to communicate with the central area through a notch provided in the partition plate. According to this defined third phase, the dust collection force in the central area can be set particularly high, and fumes from the steel to be cut located near the central area can be efficiently collected. Fumes that have spread outside the dust collection range of the central area can be collected through the lateral areas.

[0010] The fourth aspect of this invention is defined as follows: In the first aspect, a mobile dust collector is provided, which is installed to close off the corner area of ​​the dust collection zone within the dust collection hood, and which guides the fumes sucked into the dust collection zone toward the suction port of the suction duct. According to this defined fourth phase, the problem of fumes accumulating inside the dust collection hood (in the corners of the dust collection area) can be resolved.

[0011] The fifth aspect of this invention is defined as follows: In the first phase, a mobile dust collector is provided, in which a dust collection hood is formed to be long in the left-right direction perpendicular to the front-rear direction which is the direction of movement of the trolley, a plurality of dust collection areas separated in the left-right direction are set inside the dust collection hood. The suction duct connected to each dust collection area is provided with a flow path opening / closing means. According to the fifth aspect defined as above, even when changing the cutting position in the left - right direction in the cut steel material, it is possible to cope by selecting any one of the plurality of dust collection areas provided in the left - right direction as a dust collection area suitable for dust collection without moving the dust collection hood itself.

Brief Description of the Drawings

[0012] [Figure 1] It is a plan view of a mobile dust collection device according to an embodiment of the present invention. [Figure 2] It is a cross - sectional view taken along line II - II of FIG. 1. [Figure 3] It is a cross - sectional view taken along line III - III of FIG. 1. [Figure 4] It is a view showing the dust collection hood of FIG. 1 together with the suction duct, (A) is a plan view, (B) is a front view showing a partially cut - out part, and (C) is a view showing the flow - rectifying plate attached inside the dust collection hood alone. [Figure 5] It is a cross - sectional view taken along line V - V of FIG. 4. [Figure 6] It is an explanatory view of a steel material cutting operation using the mobile dust collection device.

Modes for Carrying Out the Invention

[0013] Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a mobile dust collection device according to an embodiment of the present invention. FIG. 2 is a cross - sectional view taken along line II - II of FIG. 1. FIG. 3 is a cross - sectional view taken along line III - III of FIG. 1. In FIG. 1, reference numeral 1 denotes a mobile dust collection device installed in a return material storage area. The mobile dust collection device 1 includes a self - propelled cart 3, a dust collection hood 40 that moves together with the cart 3, and a dust collector 23, and collects the fumes generated when gas - cutting a return material W as a cut steel material.

[0014] The carriage 3 includes a base 11 to which the dust collector 23 and the side wall portions 16 are attached and fixed, and a plurality of wheels 12 attached to the lower surface side of the base 11, and is configured to be able to travel along a rail 14 (specifically, 14a, 14b, 14c) which is a conveyance track linearly extending in the front-rear direction. As shown in FIG. 2, in this embodiment, three wheels 12 are configured to travel on one rail, and nine wheels 12 are attached to the lower surface side of the base 11 with respect to the three rails 14a, 14b, 14c. The four wheels 12 arranged near the four corners of the base 11 are drive wheels driven by a motor, and the remaining five wheels 12 are driven wheels.

[0015] The side wall portions 16 attached to the base 11 are composed of side wall portions 16a, 16b facing each other in the front-rear direction and side wall portions 16c, 16d facing each other in the left-right direction. These side wall portions 16 surround the upper region of the carriage 3 in the circumferential direction. And at the upper ends of these side wall portions 16, a roof portion 18 is attached so as to close the region surrounded by the side wall portions 16 from above. In this embodiment, a cutting work area 19 is set in the indoor area surrounded by these side wall portions 16 and the roof portion 18, and a work deck 60, a gas cutting device (not shown), and a dust collection hood 40 are provided in the cutting work area 19.

[0016] In FIG. 1, the portion between the rails 14a and 14b is a placement area for the return material W to be gas-cut, and a plurality of sleeper members 20 are arranged at intervals in this return material placement area. The sleeper member 20 is a prismatic member long in the front-rear direction and holds the return material W at a certain interval from the ground.

[0017] In the base 11 of the carriage 3, the portion overlapping the return material placement area is cut out in the front-rear direction. Also, as shown in FIG. 2, openings provided with shutter-type opening and closing doors 17a, 17b are provided in the portions of the front-rear side wall portions 16a, 16b erected on the base 11 that overlap the return material placement area.

[0018] As shown in Figures 1 and 2, when the return material W to be cut is placed on the front side of the trolley 3, the trolley 3 moves forward, and after the return material W is placed in the cutting work area 19 provided in the indoor area of ​​the mobile dust collector 1, the cutting work of the return material W is performed. In other words, since dust collection is performed in the indoor area enclosed by the side walls 16 and the roof 18, deterioration of dust collection efficiency due to outdoor weather conditions can be avoided.

[0019] As shown in Figure 1, a dust collector 23 is mounted on the outside (right side in the figure) of the side wall 16d on the trolley 3. The dust collector 23 consists of a dust collector body 24 and an exhaust fan 25 connected to the dust collector body 24. The dust collector body 24 is connected to the end of the suction path extending from the dust collection hood 40, and the fumes sucked in by the exhaust fan 25 are separated by a filter (not shown) inside the dust collector body 24, and the air is separated and discharged to the outside air.

[0020] The suction duct 30, which connects the dust collection hood 40 and the dust collector body 24 to form a suction path, is composed of a base pipe 31 and a connecting duct 32. One end of the base pipe 31 is connected to the dust collector body 24, and the other end extends horizontally above the cutting work area 19 in the indoor area enclosed by the side wall 16 and the roof 18. As shown in Figure 3, the connecting duct 32 is a duct that connects the base pipe 31 and the dust collection hood 40 in an indoor area. In this embodiment, the base pipe 31 and the dust collection hood 40 are connected using three connecting ducts 32 that are spaced apart in the left-right direction.

[0021] Each connecting duct 32 is equipped with an opening / closing damper 33 as a means for opening and closing the flow path, and by opening and closing the opening / closing damper 33, the position in which dust collection takes place (specifically, its left-right position) can be selected. The connecting duct 32 also includes an expandable duct 32b whose pipe section is formed in a bellows shape, and its length expands and contracts in accordance with the raising and lowering operation of the dust collection hood 40, which will be described later.

[0022] The dust collection hood 40 is a component that is located near the return material W to be cut and sucks up fumes generated during cutting. It is arranged in the cutting work area 19 in a manner that extends long in the left-right direction. As shown in Figure 2, the dust collection hood 40 is suspended via a lifting device 37, such as a chain block, positioned between the building-side member 36 and the dust collection hood 40. More specifically, as shown in the enlarged section, the lifting fitting 45 on the dust collection hood 40 side is hooked onto a lower hook 39 provided at the lower end of the load chain 38 of the lifting device 37. The dust collection hood 40 can be raised and lowered by operating the suspension device 37, as shown by the dashed line in Figure 2. By adjusting the height of the dust collection hood 40 to match the size of the return material W to be cut, the dust collection efficiency can be improved.

[0023] Next, the shape of the dust collection hood 40 will be described. As shown in Figures 4 and 5, the dust collection hood 40 is a box-shaped member composed of an upper plate 41 extending horizontally, a rear plate 42 extending vertically, a front plate 43 inclined downwards and backwards, and side plates 44, 44 that close both ends in the left and right directions. Its cross-sectional shape is an inverted trapezoid, with the upper side being longer than the lower side, as shown in Figure 5. The tip (suction port 34) of a connecting duct 32, which extends from the dust collection hood 40 and forms part of the suction path to the dust collector 23, is connected to the upper plate 41 of the dust collection hood 40. The inside of the dust collection hood 40 is a dust collection area 47 that communicates with the suction port 34, and a downward-facing fume intake port 48 is formed at the lower end of the dust collection hood 40. The fume intake port 48 is formed as a long opening in the left-right direction, extending from one side plate 44 to the other side plate 44 of the dust collection hood 40, and fumes generated from the return material W are mainly sucked into the dust collection hood 40 through the fume intake port 48.

[0024] As shown in Figures 4(B) and 5, a slit-shaped gap (second fume intake port) 49 extending in the left-right direction is formed between the upper end of the front plate 43 and the upper plate 41. Directly above the gap 49, an overhang portion 41a is provided that extends forward from the upper plate 41, and any fumes that were not sucked in by the fume intake port 48 are held in place by the overhang portion 41a and sucked into the dust collection hood 40 through the gap 49.

[0025] Inside the dust collection hood 40, which is long in the left-right direction, there are multiple (in this case, three) dust collection areas 47 separated in the left-right direction by partition plates 50, and each dust collection area 47 is connected to a connecting duct 32 equipped with an opening / closing damper 33 (see Figure 3).

[0026] Each dust collection area 47 is divided by a partition plate 52 into a central area 53 facing the suction port 34 and a lateral area 54 located away from the suction port 34. This configuration allows for particularly high dust collection in the central area 53, thereby improving the dust collection efficiency of fumes generated near the central area 53.

[0027] As shown in Figure 5, a notch 55 is provided on the upper end side of the partition plate 52 that separates the central area 53 and the lateral area 54, and at a position that overlaps with the suction port 34 when viewed from the side, thereby connecting the lateral area 54 and the central area 53. Fumes sucked into the lateral area 54 are then drawn through the notch 55, through the central area 53, and into the connecting duct 32.

[0028] Figure 4(C) shows a flow straightening plate 57 installed at the corner 47b of the dust collection area 47. Three sides of the flow straightening plate 57 are joined to the top plate 41, rear plate 42, and side plate 44 (or partition plate 50) that define the corner 47b, respectively. In this embodiment, the corners 47b belonging to the lateral area 54 tend to accumulate fumes due to stagnant airflow even during dust collection. Therefore, by closing the area of ​​the corners 47b with the flow straightening plate 57 and guiding the fumes sucked into the lateral area 54 through the fume intake port 48 toward the intake port 34 of the suction duct using the flow straightening plate 57, the problem of fumes accumulating in the corners 47b of the dust collection area 47 can be resolved.

[0029] Next, we will explain the cutting process of the return material W using the mobile dust collector 1. As shown in Figure 1, if the return material W is placed in front of the mobile dust collector 1, the mobile dust collector 1 (specifically the trolley 3) is moved forward to position the return material W in the designated location within the cutting work area 19 provided inside the mobile dust collector 1. If necessary, the height of the dust collection hood 40 is adjusted by operating the lifting device (suspension device 37). Then, of the three connecting ducts 32 (see Figure 3) located at different positions in the left and right directions, the opening / closing damper 33 of the connecting duct suitable for dust collection is opened to start dust collection.

[0030] Gas cutting is performed by an operator from a work deck 60 located on the base 11 of the trolley 3. As shown in Figure 6, the return material W is gas-cut by a flame torch 61 extending diagonally downward from the work deck 60. At this time, by aligning the cutting position (its left-right position) with the central area 53, where the dust collection force is set to be particularly high, fumes generated from the return material W can be efficiently collected. Furthermore, fumes that are not sucked in by the fume intake port 48 leading to the central area 53 can be sucked into the dust collection hood 40 through the fume intake port 48 leading to the lateral area 54 or through a gap 49 formed at the top of the dust collection hood 40.

[0031] After the cutting of the first return material W is completed, the mobile dust collector 1 can be moved further forward so that the next return material is positioned in a predetermined location in the cutting work area 19, and the cutting of the return material W can be performed in the same manner as described above. As the mobile dust collector 1 moves forward, the cut return material is sequentially discharged outdoors from the rear side of the mobile dust collector 1.

[0032] As described above, with the mobile dust collector 1 of this embodiment, the dust collection hood 40 can be moved over a wide area along the rail 14, and cutting and dust collection of fumes generated at any location in the return material storage area can be performed. In the mobile dust collector 1, the dust collection hood 40 and the dust collector 23 move together as a single unit, so even when moving over a wide area within the return material storage area (when a wide range of movement for the dust collection hood 40 is ensured), the length of the suction path between the dust collection hood 40 and the dust collector 23 is kept constant, and the problem of reduced dust collection capacity due to the range of movement of the dust collection hood 40 can be avoided.

[0033] Furthermore, the mobile dust collector 1 of this embodiment has side walls 16 that surround the top of the trolley 3 in the circumferential direction, and a roof 18 that closes the area enclosed by the side walls 16 from above. A dust collection hood 40 is provided in the indoor area enclosed by these side walls 16 and roof 18, thereby preventing deterioration of dust collection efficiency caused by outdoor weather conditions, etc.

[0034] Furthermore, in the mobile dust collector 1 of this embodiment, the dust collection area 47 inside the dust collection hood 40 is divided into a central area 53 facing the suction port 34 of the suction duct 30 and a lateral area 54 separated from the central area 53 by a partition plate 52, and the lateral area 54 is configured to communicate with the central area 53 via a notch 55 provided in the partition plate 52. Therefore, the dust collection power in the central area 53 can be set particularly high, and fumes generated from the return material placed near the central area 53 can be efficiently collected. In addition, fumes that have spread outside the dust collection range of the central area 53 can be collected through the lateral areas 54.

[0035] Furthermore, in the mobile dust collector 1 of this embodiment, a rectifier plate 57 is attached to close off the corner portion 47b of the dust collection area 47, and the rectifier plate 57 is configured to guide the fumes sucked into the dust collection area 47 toward the suction port 34 of the suction duct 30, thereby eliminating the problem of fumes accumulating inside the dust collection hood 40 (corner portion 47b of the dust collection area 47).

[0036] Furthermore, in the mobile dust collector 1 of this embodiment, a plurality of dust collection areas 47 separated in the left-right direction are set inside a dust collection hood 40 that is formed to be long in the left-right direction, and an opening / closing damper 33 is provided as a means for opening and closing the flow path in the suction duct 30 connected to each dust collection area 47. Therefore, even when changing the cutting position in the left-right direction, it is not necessary to move the dust collection hood 40 itself, but rather one of the multiple dust collection areas 47 provided in the left-right direction can be selected as the dust collection area suitable for dust collection.

[0037] The embodiments of the present invention have been described in detail above, but these are merely examples. For example, the above embodiment was an example in which three dust collection areas were provided inside the dust collection hood, but the number of dust collection areas provided inside the dust collection hood can be changed as appropriate. Furthermore, although the above embodiment was an example of gas cutting of the steel material to be cut, the mobile dust collector of the present invention can also be used for cutting methods other than gas cutting (for example, saw cutting), and the present invention can be configured in various modified forms without departing from its spirit. [Explanation of Symbols]

[0038] 1. Mobile dust collector 3 carts 14, 14a, 14b, 14c Rails (transport tracks) 16,16a,16b,16c,16d Side wall part 18. Roof section 23 Dust collector 30 Suction duct 33. Opening / closing damper (flow path opening / closing means) 34 Suction port 40 Dust collection hood 47 Dust collection area 47b Corner 52 partition plates 53 Central area 54 Lateral area 55 Notch 57 Rectifier plate W Return material (steel material to be cut)

Claims

1. A dust collection hood located near the steel material being cut to suck up fumes generated during cutting, A suction duct connected to the dust collection hood, A dust collector connected to the end of the suction path formed by the aforementioned suction duct, A trolley that moves along a transport track to move the dust collection hood and dust collector as a single unit, A mobile dust collector equipped with [a specific feature].

2. The mobile dust collector according to claim 1, comprising a side wall portion erected on the trolley and surrounding the top of the trolley in a circumferential direction, and a roof portion that closes the area enclosed by the side wall portion from above, wherein the dust collection hood is provided in the indoor area enclosed by the side wall portion and the roof portion.

3. The portable dust collector according to claim 1, wherein the dust collection area within the dust collection hood is divided into a central area facing the suction port of the suction duct and a lateral area separated from the central area by a partition plate, and the lateral area is configured to communicate with the central area through a notch provided in the partition plate.

4. The mobile dust collector according to claim 1, further comprising a flow straightening plate that is attached to close off the corner area of ​​the dust collection zone within the dust collection hood and guides the fumes sucked into the dust collection zone toward the suction port of the suction duct.

5. Inside the dust collection hood, which is formed to be long in the left-right direction perpendicular to the front-back direction which is the direction of movement of the trolley, multiple dust collection areas separated in the left-right direction are set up. The mobile dust collector according to claim 1, wherein the suction duct connected to each dust collection area is provided with a flow path opening / closing mechanism.

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