JP3753510B2 - Dust collection hood device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dust collection hood apparatus suitable for use in a dust collector that collects dust containing fumes and spatter (spark) generated during welding work and fusing work.
[0002]
[Prior art]
When collecting dust generated during welding and fusing operations with a dust collector, the dust contains fumes and spatter (slag and metal particles scattered during welding work in arc welding and gas welding). Since spatter turns into sparks at the same time, if it is sucked directly to the dust collector, it will ignite the filter and cause a fire. Conventionally, a nonflammable pre-filter using a stone filter or the like has been installed in the front of the dust collector. In addition, a dust collection hood that suppresses the scattering of spatter and the like (many canobie hoods) is used so that sparks are not directly sucked into the dust collector.
[0003]
FIG. 7 illustrates the above-described conventional configuration. In the figure, E is a filter-type dust collector, 11 is a transport duct tube to which a blower (not shown) provided in the dust collector E is applied, and 12, 12 Is a suction duct pipe branchedly connected to the transport duct pipe 11, 13 and 13 are non-combustible prefilters made of stone filters or the like attached to the lower end suction port of each suction duct pipe 12, and 14 is spaced below the prefilter 13 A dust collection hood such as a canoby hood installed with the opening facing downward is shown.
[0004]
Further, S is a work to be welded or melted, T is a welding machine, and the fume HM and spatter SP generated by the welding work or the melt work are collected by the prefilter 13 as shown on the left side. Or, once collected in the dust collecting hood 14 as shown on the right side, it is collected by the pre-filter 13 provided on the upper part thereof, so that a safe gas containing no spatter SP as a fire type ( [0005] Only the fume HM) was sucked to the dust collector E side to collect the dust.
However, as described above, when the spatter SP and the fume HM are directly sucked to the prefilter 13 side, the fume HM gradually accumulates on the prefilter 13 as shown in FIG. 8, and the incomplete combustion fume HM is caused by the spark of the sputter SP. When ignited, there was a risk that the ignited fume in the prefilter 13 would be formed into a new spark and sucked to the dust collector E side.
[0006]
Further, when the dust collection hood 14 described above is used, the direct suction of the spatter SP and the fume HM can be prevented. However, if the dust collection hood 14 is provided, the suction of the sputter SP to the prefilter 13 cannot be completely prevented. In addition, there is a risk of fire similar to that in the case of the pre-filter 13 and the dust collector for preventing the occurrence of a fire because there is a possibility that dust accumulates on the upper surface of the dust collecting hood 14 and this creates a new fire type. There was a problem that the hood 14 itself created the cause of the fire.
[0007]
In addition, the occurrence of fire due to the above-mentioned spatter SP is particularly noticeable in the case of carbon dioxide welding or argon welding, when carbon dioxide laser cutting or plasma melting is performed, or during various operations using inert gas. In order to safely proceed with each of these operations, immediate measures were desired.
[0008]
Therefore, as seen in the application of Japanese Patent Application No. 9-94647, the present applicant surely settles and eliminates the flammable spatter generated during welding or fusing without sucking the dust collector side. We have developed a dust collection hood device for dust collectors that can suck and collect only safe gas dust that does not contain fire types.
[0009]
[Problems to be solved by the invention]
The dust collection hood apparatus according to the above application is configured such that the height of the suction duct tube raised above the dust collection hood portion is set to a certain dimension or more, while controlling the wind speed in the tube to a certain speed or less, Although it has a feature that can prevent suction and protect the dust collector from fire, on the other hand, depending on the situation such as the space where this dust collection hood device is installed, the above conditions may not be sufficiently secured, and In some cases, installation may be impossible in connection with other equipment, and improvement has been desired.
[0010]
Therefore, the technical problem of the present invention is that flammable spatter is reliably generated inside the dust collecting hood itself without connecting a suction duct pipe having a height of a certain dimension or more and controlling the wind speed in the pipe below a certain speed. It is to provide a dust collecting hood device devised so that it can settle and disappear.
[0011]
[Means for Solving the Problems]
(1) In order to solve the above technical problems, the dust collecting hood apparatus according to claim 1 of the present invention, the suction effect of the blower so as to cover the upper surface of the dust collection opening which is open to the ceiling of the working chamber A dust collection hood that is configured to collect fume and spatter generated in each of these operations in the dust collection hood by performing various operations such as welding and fusing under the dust collection hood. It is a dust hood device, and a collision plate for preventing intrusion of the fumes and spatters whose outer shape is formed larger than the dust collection port is formed in the lower part of the dust collection port provided in the work chamber with a gap in the vertical direction. On the other hand, a plurality of guide vanes are formed on the upper surface of the collision plate and outside the dust collecting port so that a plurality of guide vanes are formed from the outer peripheral portion of the collision plate toward the inner center. husband way, toward the inside center direction of the impingement plate In a state of being inclined, and, while projecting at intervals in the circumferential direction, the upper side of each guide vane is characterized in that come into contact with the ceiling surface of the working chamber.
[0012]
(2) Moreover, the dust collection hood apparatus which concerns on Claim 2 of this invention forms the shape of a dust collection hood in square shape or a round shape, and makes the collision board attached to a square dust collection hood into a rectangular shape, and round. The collision plate to be attached to the dust collecting hood is formed in a circular shape .
[0013]
According to the means according to claim 1 described in the above (1), most of the flammable spatter (spark) generated by welding work, fusing work, etc. is directly passed through the dust collection port provided on the ceiling of the work room. Rather than being sucked into the dust collection hood, after first hitting the collision plate and reducing its speed, most of it settles down to the floor due to its own weight, but it does not settle down and rides on the suction action of the blower Even if spatter is sucked into the dust collection hood through the gap between the collision plate and the dust collection hood, the spatter flowing into this gap is guided by the guide blades protruding from the upper surface of the collision plate. Since a plurality of swirling flows are sucked, most of the sputters that flow in collide with each of these guide blades during swirling and stall, and disappear or settle as they are.
[0014]
Further, the remaining sputtered aspirated (raised) to the inside of the dust collecting hood riding suction airflow without being completely precipitated in the above gap, the swirling flow and Ri formed is guided by the plurality of guide vanes, then the central As it rises along the inner peripheral surface of the dust collection hood through the dust collection port, and gradually slows down due to collision with the inner wall surface of the hood and frictional resistance, and the fire is extinguished by lowering its heat generation, Fire powder-like spatter does not directly enter the dust collection duct or dust collector side, and fire can be reliably prevented.
[0015]
Furthermore, according to the means according to claim 1 described in the above (1), by coming into contact with the ceiling surface of the upper side of the working chamber of each guide vane, the gap guide vanes themselves between the impingement plate and the dust collection hood Therefore, the structure of the dust collection hood can be made relatively simple, while the spatter flowing in from the outside of the collision plate to the inside is not sucked straight into the dust collection hood. It can always be put on a swirling flow and collide with the guide blade and the hood wall surface to be stalled and settled, and it is possible to surely prevent the occurrence of fire due to the intrusion of spatter.
[0016]
According to the measures according to claim 2 as described above (2), in the case of rectangular dust collecting hood, sputtering swirling along the hood wall surface whirling flow hitting the corners of the dust collecting hood Because of the stall, the disappearance of spatter can be further ensured, and the overall configuration of the hood device can be made compact and well-structured because the shape of the collision plate is matched to the shape of the dust collection hood. enable.
[0017]
As described above, the technical problems described above can be solved by the means (1) and (2) , and the problems of the conventional techniques can be solved.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, an embodiment of the present invention will be described. FIG. 1 is a configuration illustrating an entire dust collecting hood apparatus according to the present invention, and FIG. Is a work chamber, 2 is a mounting table on which the work 3 is placed, 4 is a welding machine, 5S and 5T are attached so as to cover the upper surface side of a dust collection port 1H (see FIG. 2) opened in the ceiling 1T of the work chamber 1. A dust collecting hood 5Z formed in a square cross section (see FIG. 3) or a round cross section (see FIG. 6) indicates a mounting flange formed at the lower end of each dust collecting hood 5S, 5T.
[0019]
Reference numeral 6 denotes a dust collection duct connecting the dust collection hood 5S or 5T and the dust collector 7. The suction action of a blower (not shown) provided in the dust collector 7 is used to draw the dust collection hood 5S or By being applied to 5T, fumes and spatter SP generated by welding work and fusing work are collected in the dust collection hood 5S or 5T.
[0020]
Nos. 8 and 9 are fume and spatter intrusion impingement plates attached with gaps 8X and 9X below the dust collection hood 5S or 5T so as to cover the lower end of the dust collection hood 5S or 5T, and 10 are installation bolts thereof. The collision plate 8 used for the dust collection hood 5S formed in a square cross section is formed in a rectangular shape as shown in FIG. 3, and the collision plate 9 used in the dust collection hood 5T formed in a round cross section is illustrated in FIG. As shown in FIG.
[0021]
1 to 6, 8A... And 9A... Are spaced apart from each other in the circumferential direction on the upper surface of each of the collision plates 8 and 9. A plurality of guide blades arranged in an inclined state with respect to the inner central direction so as to form a plurality of substantially spiral flow paths toward the central direction, and each guide blade 8A... And 9A As shown in FIG. 5, the shape formed in an angled L-shaped cross section is configured by screwing or welding the upper surfaces of the collision plates 8 and 9 upward, but this configuration method is an example of implementation. is there.
[0022]
3, 4, and 6, 10 </ b> A is a bolt hole provided for inserting the mounting bolts 10..., And each of the collision plates 8 and 9 has a guide blade 8 </ b> A. The bolts 10 are inserted into the bolt holes 10A with the upper side in contact with the ceiling 1T of the work chamber 1 and tightened with nuts, whereby each dust collection is performed with the gaps 8X and 9X spaced apart. It is attached to the lower end of the hood 5S, 5T so that fumes and spatter generated by welding or fusing work are not directly sucked into the dust collection hood 5S, 5T.
[0023]
Since the dust collecting hood apparatus according to the present invention has the above-described configuration, the dust collector 7 is operated in a state where the dust collecting hood 5S or 5T and the dust collector 7 are connected by the dust collecting duct 6 as shown in FIG. However, when welding work or fusing work is performed in the work chamber 1, fumes and flammability generated by each work due to the suction action by the blower of the dust collector 7 reaches the dust collection hoods 5 </ b> S and 5 </ b> T through the dust collection duct 6. As shown in FIG. 2, the spatter SP ... collides with the collision plates 8 and 9, and most of them settle to the floor surface as they are. As shown by arrows XT in FIG. 2, the air is sucked into the gaps 8X and 9X between the collision plates 8 and 9 and the lower ends of the dust collecting hoods 5S and 5T.
[0024]
As described above, the fumes and the spatter SP that are sucked into the gaps 8X and 9X are a plurality of substantially spiral flow paths configured by the guide blades 8A and 9A that protrude from the upper surfaces of the collision plates 8 and 9, respectively. And the main fumes and spatters SP collide with the inner wall surfaces of the guide blades 8A, 9A, and the dust collecting hoods 5S, 5T. .
[0025]
As a result, the time until the sucked combustible spatter SP... Reaches the dust collection hood 5S or 5T or the dust collection duct 6 side from the dust collection port 1H of the work chamber 1 can be extended. In order to reduce the heat generation of the spatter SP ... reliably and extinguish the fire, the burned residue can be sucked and collected through the dust collecting duct 6 to the dust collector 7 with the spatter SP ... completely extinguished. 7 fires can be prevented.
[0026]
When the square dust collection hood 5S as shown in FIG. 3 is used as the dust collection hood, the spatter SP ... rotates on the swirl flow XR ... shown in FIG. When rising along the inner wall surface, the spatter SP... Hits the corner of the dust collection hood 5S, and the chance of energy loss increases.
[0027]
【The invention's effect】
As described above, according to the dust collection hood apparatus according to the present invention, most of the spatter generated by welding or fusing work performed in the work chamber is not directly sucked from the work chamber to the dust collector side, but is collected. Spatter is not sucked directly to the dust collector side before reaching the hood or dust collecting duct, and spatter does not reach the prefilter even if a prefilter is installed in the middle of the dust collecting duct. Since the fume accumulated on the prefilter is not ignited, the dust collector can be reliably protected from fire.
[Brief description of the drawings]
FIG. 1 is a configuration diagram illustrating an example of use of a dust collection hood apparatus according to the present invention.
FIG. 2 is an enlarged cross-sectional view showing a main part of the present invention.
FIG. 3 is a bottom view of the present invention using a square dust collection hood.
FIG. 4 is a side view of a collision plate used in the present invention.
FIG. 5 is a cross-sectional view showing a configuration of a guide blade portion protruding from a collision plate.
FIG. 6 is a bottom view of the present invention using a round dust collecting hood.
FIG. 7 is a side view illustrating a conventional configuration.
FIG. 8 is a configuration diagram illustrating a state in which spatter as a fire type is deposited on the prefilter.
[Explanation of symbols]
1 Work Room 3 Work 4 Welding Machine 5S, 5T Dust Collection Hood 6 Dust Collection Duct 7 Dust Collector 8, 9 Colliding Plate 8A, 9A Guide Blade 8X, 9X Clearance SP Spatter

Claims (2)

This is done by attaching a dust collection hood that has a suction function of the blower so as to cover the upper surface of the dust collection opening that opens in the ceiling of the work room, and performing various operations such as welding and fusing under the dust collection hood. A dust collection hood device configured to collect fume and spatter generated in each operation in the dust collection hood,
On the lower part of the dust collection port provided in the working chamber, an impact plate that prevents the intrusion of the fumes and spatters, whose outer shape is larger than the dust collection port, is installed with a gap in the vertical direction. Inside the collision plate, on the upper surface and outside the dust collection port , a plurality of guide vanes are formed so as to form a plurality of spiral flow paths from the outer periphery of the collision plate toward the center of the interior. in a state of being respectively inclined toward the center direction, and, while projecting at intervals in the circumferential direction, dust collecting hood apparatus, wherein a top side of each guide vane to contact the ceiling surface of the working chamber .   The shape of the dust collection hood is square or round, the collision plate attached to the square dust collection hood is rectangular, and the collision plate attached to the round dust collection hood is circular. The dust collection hood apparatus according to claim 1.

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