JP2008086955A - Mist/dust collection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mist/dust collection apparatus suited to collection/recovery of fume generated in arc welding work or fine dust/mist generated from a cutting machine or a grinding machine. <P>SOLUTION: In a collection unit 10, a rotary filter 31 formed by cylindrically attaching a filter medium 34 having a lot of pleats 35 continuously formed zigzag by nonwoven fabric with mesh of 0.3-1μm, is mounted on a rotary shaft 26 provided in a casing 11 with a negative inside pressure by the normal operation of a Roots blower 55; the filter 31 is provided rotatable at a given speed by a motor device 23; an air blow nozzle 51 is provided cleaning the filter by jetting pressurized air generated by the reverse rotation of the Roots blower 55 to the outer periphery of the rotary filter 31; and a recovery bag 45 containing dust removed from the rotary filter 31 in cleaning by the air blow nozzle 51 is provided at a lower part of the casing 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is for collecting and collecting fumes generated during arc welding work, fine dust and mist generated from cutting machines and polishing machines, and carbon, oil and sand generated when cleaning road surfaces with road sweepers. The present invention relates to a suitable mist / dust collecting device.

At the time of arc welding of a welded iron material coated with a rust preventive oil / paint, a fine fume of 100 angstrom class or a fine fume of 0.01 μm to 1 μm is generated. In a general filter type dust collector, a filter having a mesh of 0.1 μm to 0.5 μm is used, but clogging is likely to occur. For this reason, turbo blowers and air ejectors (air
The filter is cleaned by adsorbing the fume oil adhering to the collecting surface by injecting the lime powder etc. mixed with the pressure air generated by the ejector) onto the collecting surface of the filter. A new fume recovery method has been developed. Moreover, although the system which gives a vibration to a filter with a vibrating body and peels a fume from a collection surface is also employ | adopted, it is difficult to fully eliminate clogging.

  Japanese Patent No. 3316476 discloses a “filter cleaning device in a fume recovery machine”. This device is related to the applicant of the present application, and the pressure is applied to the back side of the collecting surface of the filter while rotating the rotating nozzle arranged inside the filter by the air action generated by the reverse rotation operation by the roots type blower. The filter is cleaned by ejecting air.

  However, in the conventional filter type dust collector, clogging due to oil-containing fume and viscous fume has not been sufficiently eliminated, and it has been difficult to maintain the collection performance in a good state.

  Next, as a conventional mist collection device, there are known various structures such as a filter method, a demister method, a cyclone method, a collision plate method, and an electric dust collection method. For example, Japanese Patent Application Laid-Open No. 11-179122 discloses an intake unit that sucks a gas contaminated with oil mist, a capture unit that captures oil mist from a gas sucked from the intake unit with a porous filter, and a trap unit that captures the gas. An oil mist collecting device is disclosed that includes an oil storage part that stores the aggregated oil mist and an exhaust part that discharges the gas from which the oil mist has been removed.

  Japanese Patent Laid-Open No. 2000-296305 discloses that a permeable member is provided at the entrance of a hood disposed above a mist generating section, and the mist is attached to the permeable member by the operation of a suction device connected to the suction pipe of the hood. A mist collecting device for sucking and collecting an object is disclosed.

  In Japanese Patent Laid-Open No. 9-47617, a collection plate having a porous material layer provided on the surface on which mist collides is provided in the collection chamber, and the mist-containing air guided to the collection chamber collides with the collection plate. A mist removing device that collects mist is disclosed.

  Further, Japanese Patent No. 28888684 discloses that in a path for exhausting high-temperature exhaust gas to the outside air, the exhaust gas is brought into contact with water circulating in the sealed chamber, and the temperature of the exhaust gas decreases due to the heat of vaporization. A method for cooling and purifying combustion exhaust gas in which solid particles such as carbon powder in the gas and harmful components such as carbon monoxide are decomposed and adsorbed on water is disclosed.

As described in the above-mentioned patent publications, mist has various properties such as water mist, oil mist, coarse mist (particle size: about 20 μm or more) and fine mist (particle size). : About 1 to 0.01 μm or less). For this reason, the collection system as described above is employed corresponding to the type of mist. In any case, if the generated mists are not processed efficiently, the working environment will be comfortable, the health of the workers will be safe, the processing machines and equipment that generate the mist will operate normally, and the surrounding buildings It can be said that it is difficult to prevent contamination.
Japanese Patent No. 3316476 Japanese Patent Laid-Open No. 11-179122 JP 2000-296305 A Japanese Patent Laid-Open No. 11-19775 Japanese Patent Laid-Open No. 9-47617 Japanese Patent No. 28888684

  An object of the present invention is to provide a mist / dust collecting device suitable for collecting / recovering fumes generated during arc welding work, fine dust / mist generated from a cutting machine / polishing machine, etc. It is in.

In order to achieve the above object, the invention described in claim 1 is a collection unit for collecting fumes, mist and dust generated by welding from the suction pipe together with ambient air to collect the mist and dust. And a mist / dust collecting device composed of a Roots-type blower that discharges the air that has passed through the unit to the outside while making the inside of the case of the collecting unit negative pressure,
As for the collecting unit, a large number of wrinkles are zigzag-shaped with a nonwoven fabric having a mesh size of 0.3 μm to 1 μm at the tip of a rotating shaft that is provided rotatably on the housing of the case and faces the case. A rotary filter with a continuously formed filter material mounted on the outer periphery of a porous cylindrical core is attached, and the rotary filter is rotatably provided at a predetermined rotational speed by a motor device. An air blow nozzle that cleans the filter by blowing pressure air generated by operation on the outer peripheral surface of the rotary filter is provided, and a collection bag that stores dust removed from the rotary filter during cleaning by the air blow nozzle. It is provided in the lower part of the case so that attachment or detachment is possible.

  In order to achieve the same object, the invention described in claim 2 is characterized in that, in the mist / dust collecting device according to claim 1, a recovery tank is provided at the lower part of the case so as to be mountable. To do.

  In order to achieve the same object, the invention described in claim 3 is the mist / dust collection device according to claim 1 or 2, wherein the bottom portion is disposed between the suction pipe and the collection unit. It is characterized in that a separation tank containing a cyclone formed so as to spread in a trumpet shape is interposed.

(Invention of Claim 1)
This mist / dust collection device uses a compact combination of a collection unit using a rotary filter and a Roots-type blower to prevent rust-preventing oil and paint applied to the weld iron during arc welding operations. It is possible to efficiently collect and collect fumes having a generated viscosity, fine dust and mist generated from a cutting machine, a polishing machine, and the like. Furthermore, since dust attached to the filter can be removed by blowing pressure air from the air blow nozzle onto the rotary filter, the filter can be maintained in a good state.

(Invention of Claim 2)
Since this mist / dust collection apparatus can store the dust removed by the collection unit in the recovery tank, it is easy to perform post-treatment of the removed dust.

(Invention of Claim 3)
This mist / dust collection device has a structure that can collect carbon, oil, dust, etc., generated when cleaning the road surface with a road sweeper, in a separation tank, and these dust etc. flow into the collection unit. It is possible to suppress the clogging of the filter.

  The best mode of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a mist / dust collecting device according to the present invention, FIG. 2 is a longitudinal side view of a collecting unit, FIG. 3 is a longitudinal front view of a rotary filter, and FIG. 4 is a convex portion of the rotary filter. FIG. 5 is an explanatory diagram showing a state in which the mist / dust collecting device of the present invention is applied to a polishing machine, and FIG. 6 is a road cleaning vehicle using the mist / dust collecting device of the present invention. FIG. 7 is an explanatory view showing a state applied to the road surface cleaning, and FIG. 7 is an explanatory view of the separation tank.

  As shown in FIG. 1, the mist / dust collecting apparatus A according to the present invention has a suction pipe 5 for collecting mist / dust generated from welding fume having a viscosity caused by welding, polishing machine, etc. together with surrounding air. The suction unit 6 that is sucked from the suction hood 6 provided at the tip of the suction unit 10 collects the mist and dust, and the inside of the case 11 of the collection unit 10 has a negative pressure and air that has passed through the unit It consists of a roots type blower 55 to be discharged to the outside, and these are installed on a frame 1 having casters 2. Reference numeral 7 denotes a check valve interposed in the suction pipe 5.

  The case 11 of the collection unit 10 includes a cylindrical case body 12, an end cover 16, and a housing 19. The end cover 16 is provided with an outlet 17 a provided with a check valve 18, and is attached to one open end 12 a of the case body 12. The housing 19 is attached to the other open end 12 b of the case body 12. Further, an inflow port 13 and a fume discharge pipe 14 for connecting the suction pipe 5 are opened in the body portion of the case body 12.

  An annular seal 20 and a ball bearing 21 are sequentially attached to the center hole of the housing 19 on the inner side of the case body 12, and an intermediate portion of the rotation shaft 26 of the motor device 23 described later is attached to the annular seal 20 and the ball bearing 21. Has been inserted.

  The casing 24 of the motor device 23 is attached to the small diameter flange 19 b of the housing 19. The rotating shaft 26 of the motor device 23 is rotatably supported by a ball bearing 25 built in the casing 24 and the ball bearing 21, and is arranged so that the tip end portion 26 a faces the case 11. .

  Reference numeral 31 denotes a rotary filter that is detachably provided at the distal end portion 26 a of the rotary shaft 26. As shown in FIG. 3, this filter 31 has a rough soft interference material 33 using an oil-resistant polypropylene material or the like attached to the outer periphery of a porous cylindrical core material 32 such as a punching metal, and further has a cylindrical shape on it. A filter member 34 having a shape is mounted, and both ends of the cylindrical core member 32, the rough soft interference member 33, and the filter member 34 are sandwiched between face plates 38 and 40 and fixed to the rotary shaft 26.

The filter material 34 is a material capable of collecting fine fume dust of 100 angstrom class, and a large number of ridges 35 are continuously formed in a zigzag shape by a nonwoven fabric of mesh 0.3 μm to 1 μm. (FIGS. 3 and 4). The size of the filter material 34 is about 200 to 500 mm in outer diameter and about 200 to 500 mm in length.

  One face plate 38 is fixed to the rotary shaft 26 by tightening a nut 28 screwed into the rotary shaft 26 in a state where a hole formed in the center portion is loosely fitted to the rotary shaft 26 and the bush 27 is fitted. Yes. An inward flange 38a is formed on the outer periphery of the face plate 38, and the convex portion 35a of the filter material 34 is provided so as to be loosely fitted by the inward flange 38a.

  The other face plate 40 is fixed to the rotary shaft 26 by inserting a shaft cylinder 41 formed on the back side of the center portion into the rotary shaft 26 and tightening a bolt 44. Around the shaft cylinder 41, four holes 42 are provided as shown in FIG. An inward flange 40a is formed on the face plate 40, and the convex portion 35a of the filter material 34 is provided so as to be loosely fitted by the inward flange 40a. A cylindrical portion 43 formed on the front side of the center portion of the face plate 40 is inserted into the large-diameter hole 17b of the end cover 16 in a substantially contact manner. A plurality of annular grooves 17 c are formed in the large diameter hole 17 b, and a labyrinth seal is formed by the annular grooves 17 c and the outer peripheral surface of the cylindrical portion 43.

  The rotary filter 31 is provided to be driven and rotated by the motor device 23 at 500 to 1000 revolutions per minute.

  A recovery bag 45 for recovering a part of the dust removed from the rotary filter 31 is detachably provided at the outlet 14b of the branch pipe 14a branched from the fume discharge pipe 14. Reference numeral 15 denotes a check valve interposed in the branch pipe 14a. A box-type recovery tank 46 is provided so as to be attachable to the fume discharge pipe 14. The suction side of the Roots blower 55 is connected to the outlet 17 a of the collection unit 10 through the suction pipe 50.

  Reference numeral 51 denotes an air blow nozzle for cleaning the rotary filter 31. The air blow nozzle 51 is arranged with several outlets facing the outer peripheral surface of the rotary filter 31. An air inlet 51 a of the air blow nozzle 51 is connected to the suction pipe 50 via a supply pipe 52. A check valve 53 is provided in the supply pipe 52.

The roots type blower 55 uses a three-leaf type that can switch between forward rotation and reverse rotation operation. An exhaust tank 56 is connected to the exhaust side of the roots blower 55. Reference numeral 57 denotes an exhaust port of the exhaust tank 56.
The mist / dust collection apparatus A of the present invention is configured as described above.

Next, the operation when the mist / dust collecting device A of the present invention is used for collecting fumes generated during arc welding work will be described.
(1) When arc welding is performed on the weld iron b coated with the antirust oil and paint placed on the gantry a, viscous fumes are generated together with 100 angstrom-class fume dust.
(2) In the mist / dust collection device A, the collection unit 10 and the suction pipe 5 are held at a negative pressure by the forward rotation operation of the Roots blower 55, and generated by (1) due to the negative pressure action. The fumes flow from the suction hood 6 together with the surrounding air through the suction pipe 5 into the collection unit 10.
(3) In the collection unit 10, the rotation of the rotary filter 31 is controlled by the motor device 23 within a range of 500 to 1000 revolutions per minute. Thus, the fumes having viscosity contained in the air sucked into the case 11 are spun off by the centrifugal force action of the rotary filter 31 and separated and removed.
(4) The fumes separated and removed by the rotary filter 31 fall below the case 11 and accumulate in the collection tank 46.
(5) The air dried by the collection unit 10 passes through the suction pipe 50 and the roots type blower 55 and is discharged from the exhaust port 57 of the exhaust tank 56 to the outside.

  Further, by switching the operation of the Roots-type blower 55 from normal rotation to reverse rotation, air is sucked from the exhaust side of the blower 55 and the pressure is increased and the air is introduced into the air blow nozzle 51 through the supply pipe 52. . Then, the rotary filter 31 is washed by the pressure air ejected from the outlet of the air blow nozzle 51, and the fumes removed by the filter 31 fall into the lower fume discharge pipe 14 and are stored in the collection bag 45 and the collection tank 46. Is done. Note that when the rotary filter 31 is cleaned, it is preferable to set the rotation speed of the filter 31 to about 100 times per minute.

  The mist / dust collecting apparatus A of the present invention can also be applied to the collection of fine dust / mist generated from the polishing machine d as shown in FIG. In the figure, e is a disk-shaped grindstone that is rotatably provided in the polishing machine d, and f is a workpiece.

  As shown in FIG. 6, the mist / dust collecting apparatus A of the present invention can be applied to the collection of carbon, oil, sand, and the like generated when the road surface is cleaned by a road sweeper. In the figure, h is a rotating brush provided in a road sweeper (not shown).

  When there is a possibility that a large amount of dust or the like may be mixed during the cleaning of the road surface, they are sucked into the collection unit 10 to cause clogging of the rotary filter 31. Therefore, a mist / dust collection device. A separation tank 60 shown in FIG. 7 is preferably interposed between the A suction pipe 5 and the collection unit 10.

  The separation tank 60 is provided so that a lid 62 is detachably provided in an opening 61 a above the tank body 61, and the lid 62 is fixed to the tank body 61 with a bolt 63. A cyclone 65 formed so as to spread in a trumpet shape toward the bottom and an inlet pipe 67 connected to the suction pipe 5 are provided at the center of the lid 62. The outlet pipe 66 of the cyclone 65 is connected to the inlet 13 of the collection unit 10.

(Experiment)
About the mist / dust collecting apparatus A of the present invention, the collection performance of fumes having a viscosity (wet fume) generated during welding work of a welded iron material coated with rust preventive oil, and the root type blower from the suction hood An experiment was conducted on the pressure loss (pressure loss) between the suction ports including the comparative examples 1 to 3 under the following conditions. The results are shown in the graphs of FIGS.

(Invention)
Collection unit Filter: Filter material uses synthetic nonwoven fabric Mesh 0.3μm
Diameter 200mm x length 200mm
Filter rotation speed: 1000rpm
Motor device output: 0.4 kW
Roots-type blower: Diameter 50mm x Output 1.5kw, Rotating speed 2500rpm
Discharged air amount 1.5 m ³ / min Wet fume generation amount: about 20 mg / m ³
However, with regard to the mist / dust collecting apparatus A of the present invention, the cleaning operation was repeated using an air blow nozzle with wet fume.

The result of the experiment of the present invention is shown in FIG. The filter pressure loss after 200 minutes of operation was -17 kPa, and there was no large pressure fluctuation during 2800 minutes of operation. The fume concentration measured on the exhaust side of the roots-type blower transitioned to about 0.02 mg / m ³ or less, and it was confirmed that a good collection effect can be obtained.

  About the comparative example 1, it experimented about the dry fume which generate | occur | produces at the time of welding operation of the weld iron material in which the antirust oil is not applied. The filter was washed by air blowing from the inside of the filter.

The result of the experiment of Comparative Example 1 is shown in FIG. The filter pressure loss after 160 minutes of operation was −8.5 kPa, and the fume concentration was 0.025 mg / m ³ .

In Comparative Example 2, an experiment was conducted on wet fume. The filter was washed by air blowing from the inside of the filter.
Wet fume generation amount: about 10 mg / m ³

  The result of the experiment of Comparative Example 2 is shown in FIG. The filter pressure loss after 240 minutes of operation was -10.5 kPa.

  For Comparative Example 3, an experiment was conducted on wet fume. The filter was washed by air blowing from the outside of the filter. In addition, as the filter material, a filter member in which slits having a length of 30 mm were formed at intervals of 20 mm on the convex portion 35a of the flange 35 of the filter material 34 used in the present invention was used.

  The result of the experiment of Comparative Example 3 is shown in FIG. The filter pressure loss after 470 minutes of operation was -11 kPa. It is considered that clogging of the filter material is reduced by the slight vibration of the flange 35 caused by the slit of the filter material.

Explanatory drawing of the mist / dust collection device of the present invention Vertical side view of collection unit Longitudinal front view of rotary filter Explanatory drawing of convex part of rotary filter Explanatory drawing which shows the state which applied the mist and dust collection apparatus of this invention to the grinding machine Explanatory drawing which shows the state which applied the mist and dust collection apparatus of this invention to the cleaning of the road surface by a road sweeper Illustration of separation tank Graph showing experimental results of collection performance and pressure loss in the collection device of the present invention The graph which shows the experimental result of the collection performance and pressure loss in the collection apparatus of Comparative Examples 1-3

Explanation of symbols

A ... mist / dust collecting device 5 of the present invention 5 ... suction pipe 10 ... collecting unit 11 ... case 23 ... motor device 26 ... rotating shaft 31 ... rotary type Filter 34 ... Filter material 35 ... 襞 45 ... Collection bag 46 ... Collection tank 51 ... Air blow nozzle 55 ... Roots blower 60 ... Separation tank 65 ... Cyclone

Claims (3)

Fume, mist and dust generated by welding are sucked from the suction pipe together with the surrounding air to collect the mist and dust, and the inside of the case of the collection unit is made negative pressure and In the mist / dust collection device composed of a Roots-type blower that discharges the air that has passed through the unit to the outside,
As for the collecting unit, a large number of wrinkles are zigzag-shaped with a nonwoven fabric having a mesh size of 0.3 μm to 1 μm at the tip of a rotating shaft that is provided rotatably on the housing of the case and faces the case. A rotary filter with a continuously formed filter material mounted on the outer periphery of a porous cylindrical core is attached, and the rotary filter is rotatably provided at a predetermined rotational speed by a motor device. An air blow nozzle that cleans the filter by blowing pressure air generated by operation on the outer peripheral surface of the rotary filter is provided, and a collection bag that stores dust removed from the rotary filter during cleaning by the air blow nozzle. Mist / dust collecting device, which is detachably provided at the bottom of the case Place.   The mist / dust collecting apparatus according to claim 1, wherein a collection tank is provided in a lower portion of the case so as to be mountable. The mist according to claim 1 or 2, wherein a separation tank containing a cyclone formed so as to spread in a trumpet shape toward the bottom is interposed between the suction pipe and the collection unit.・ Dust collection device.

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