JP4091066B2 - Fume recovery machine - Google Patents

Description

  The present invention relates to a fume recovery machine for collecting fume dust generated during arc welding work, and more particularly to a recovery machine suitable for a fume having a viscosity generated from a rust preventive oil / paint applied to a weld iron material.

  At the time of arc welding of a welded iron material coated with anti-rust oil and paint, fine fume dust of 100 angstrom class and viscous fume are generated. The viscous fumes are usually fine particles of 0.01 to 1 μm. 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. Therefore, by injecting lime powder etc. into the pressure air generated by a turbo fan or air ejector onto the filter's collection surface, the fume oil adhering to the collection surface is adsorbed. A fume recovery method has been developed in which the filter is cleaned. Moreover, although the system which gives a vibration to a filter with a vibrating body and peels a fume dust from a collection surface is also employ | adopted, it is difficult to eliminate clogging fully.

  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 entire 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.
Japanese Patent No. 3316476

  An object of the present invention is to provide a fume collecting machine suitable for collecting fumes having viscosity generated from a rust preventive oil / paint applied to a weld iron material during arc welding work.

In order to achieve the above-mentioned object, the invention described in claim 1 includes a first collection part for collecting fumes having a viscosity generated by welding from the suction pipe together with surrounding air, and collecting the fumes. A second collecting unit that collects fumes remaining in the air flowing in from the first collecting unit, and a roots type blower that is connected to the exhaust side of the second collecting unit and is capable of forward / reverse switching operation is framed. Installed in
About the 1st collection part, it is a cylindrical shape using the cage- like nonwoven fabric of mesh 0.3 micrometer-1 micrometer in the tip part of the axis of rotation provided in the housing of a case so that rotation may be faced in the case concerned It is formed on, and a filter material in which the slit in the convex portion of the fold is formed which is located on the radially outer side, fitted with a rotary filter mounted on the outer periphery of the porous cylindrical core, the rotary filter motor Provided to rotate by the device,
About the 2nd collection part, the suction which attached the fixed filter formed in the shape of a cylinder using the basket-like nonwoven fabric of mesh 0.3micrometer-1micrometer in the tank connected to the exhaust side of the 1st collection part A pipe is arranged so that the suction side of the roots-type blower is connected to the exhaust side of the suction pipe, and the outside air sucked during the reverse operation of the roots-type blower is discharged to the inner surface of the fixed filter. It is characterized by having comprised so that it may wash | clean.

(Invention of Claim 1)
This fume collecting machine collects viscous fumes by the rotary filter of the first collecting section, and the fumes remaining in the air flowing from the first collecting section by the fixed filter of the second collecting section. Therefore, it is possible to efficiently collect the fumes having viscosity generated from the rust preventive oil / paint applied to the weld iron material during the arc welding operation. In addition, the filter can be maintained in a good state by performing the cleaning (backwashing) of the filter by the reverse rotation operation of the roots-type blower in a timely manner in the second collection unit.

  The best mode of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a fume collecting machine, FIG. 2 is a longitudinal side view of a first collecting part, FIG. 3 is a longitudinal front view of a rotary filter, and FIG. 4 is an explanatory view of a convex part of the rotary filter.

  As shown in FIG. 1, the fume collecting machine C of the present invention sucks a fume having a viscosity generated by welding together with surrounding air from a suction hood 6 provided at the tip of the suction pipe 5 to collect the fume. Connected to the first collection unit 10 to collect, the second collection unit 50 to collect fumes remaining in the air flowing from the first collection unit 10, and the exhaust side of the second collection unit 50 The roots type blower 60 capable of forward / reverse switching operation is installed on the frame 1 having the casters 2.

  In FIG. 2, the case 11 of the first collection part 10 is attached with an end cover 15 formed with an outlet 16a at one opening end 12a of a cylindrical case body 12, and a housing 19 at the other opening end 12b. It is installed. An inflow port 13 and a drain port 14 for connecting the suction pipe 5 are opened in the body portion of the case body 12. In the center hole 19a of the housing 19, an annular seal 20 and a ball bearing 21 are sequentially mounted on the inner side on the case body 12 side. Has been inserted.

  The casing 26 of the motor device 25 is attached to the small diameter flange 19 b of the housing 19. The rotating shaft 28 of the motor device 25 is rotatably supported by a ball bearing 27 built in the casing 26 and the ball bearing 21, and is arranged so that the tip 28 a faces the case 11.

Reference numeral 31 denotes a rotary filter that is detachably provided at the tip 28 a of the rotary shaft 28. As shown in FIG. 3, the filter 31 is formed by attaching a rough and soft oil-resistant polypropylene material 33 to the outer periphery of a porous cylindrical core material 32 such as a punching metal, and through the oil-resistant polypropylene material 33. The filter material 34 formed into a shape is packaged with the slit 36 on the outside, and both ends of the cylindrical core material 32, the oil-resistant polypropylene material 33 and the filter material 34 are sandwiched by the face plates 38 and 40, and the rotary shaft 28. It is fixed to.

The filter material 34 is a material capable of collecting 100 angstrom-class fine fume dust , is formed into a cylindrical shape by a cocoon-shaped non-woven fabric having a mesh size of 0.3 μm to 1 μm, and on the outer diameter side. The slit 36 is formed in the convex part 35a of each collar 35 located (FIG. 4). The filter material 34 has an outer diameter of 200 to 500 mm and a length of about 200 to 500 mm.

  One face plate 38 is fixed to the rotary shaft 28 by tightening a nut 30 screwed into the rotary shaft 28 in a state where a hole formed in the center is loosely fitted to the rotary shaft 28 and a bush 29 is fitted. . 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 28 by screwing a bolt 44 passed through a hole 41 formed in the center to the rotary shaft 28. Around the hole 41, four holes 42 are provided. 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 at the center of the face plate 40 is inserted into the large-diameter hole 16b of the end cover 15 in a substantially contact manner. A plurality of annular grooves 17 are formed in the large diameter hole 16 b, and a labyrinth seal is formed by the annular grooves 17 and the outer peripheral surface of the cylindrical portion 43.

  The rotary filter 31 is provided so as to be driven and rotated by the motor device 25 at 1500 to 2500 rpm.

Reference numeral 45 denotes a liquid injection port established in the body portion of the inflow port 13. The liquid injection port 45 is connected to a tap or the like of a water supply via a hose (not shown), and about 200 to 500 cc of cleaning water per minute is dripped onto the outer surface of the filter material 34 of the rotary filter 31. Provide to allow. A drain cock 46 is connected to the drain port 14.
The 1st collection part 10 is comprised by the above.

Next, the second collection unit 50 will be described.
This 2nd collection part 50 is set as the structure according to the structure of the fume collection | recovery machine described in the patent 3316476 concerning this applicant.

  An intake port 52 provided with a check valve 53 is formed in the body portion of the tank 51 of the second collection unit 50. The intake port 52 and the outlet 16 a that is the exhaust side of the first collection unit 10 are connected by a connecting pipe 48. The lid 54 provided so as to close the opening above the tank 51 is provided with a discharge port (not shown) for discharging air during backwashing to the atmosphere side, and a check for opening and closing the discharge port. A valve (not shown) is provided. The periphery of the check valve is provided so as to be covered with a backwash filter (not shown).

  A substantially L-shaped suction pipe 55 is disposed in the tank 51. The suction side 55a of the suction pipe 55 is provided with a mounting seat erected around a fixed shaft (not shown). A rotating nozzle 56 is rotatably mounted on the fixed shaft. Reference numeral 57 denotes a fixed filter formed in a cylindrical shape using a cocoon-shaped nonwoven fabric having a mesh size of 0.3 μm to 1 μm. The filter 57 is disposed outside the rotary nozzle 56 and is fixed to the mounting seat.

The suction side 55 b of the suction pipe 55 and the suction side 60 a of the roots blower 60 are connected by a suction pipe 59. An exhaust tank 61 is connected to the exhaust side 60 b of the roots blower 60. Reference numeral 62 denotes an exhaust port of the exhaust tank 61. The roots type blower 60 uses a three-leaf roots type blower that can perform forward / reverse switching operation.
The fume collecting machine C is configured as described above.

The operation of the fume recovery machine C of the present invention having the above-described configuration will be described.
(1) When arc welding is performed on a welding iron material w coated with a rust-preventing oil and paint placed on the gantry a, a viscous fume is generated together with 100 angstrom-class fume dust.
(2) The fumes generated in (1) flow from the suction hood 6 together with the surrounding air through the suction pipe 5 into the first collecting unit 10 by the negative pressure action caused by the forward rotation operation of the roots blower 60. .
(3) In the first collection unit 10, the rotary filter 31 is rotated at 2500 rpm by the motor device 25. Viscous fumes 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. In addition, since the slit 36 is provided in the rotary filter 31, the pressure loss in the 1st collection part 10 can be decreased.
(4) The fume dust separated and removed by the rotary filter 31 accumulates in the lower part of the case 11. Further, tap water is dripped in time from the liquid injection port 45 to the filter 31 to clean the filter 31 and open the drain cock 46 at a suitable time using the removed fume dust as a drain to the outside. It can be discharged.
(5) The air dried by the first collecting unit 10 flows into the second collecting unit 50 through the connecting pipe 48, and the remaining fumes in the air are collected by the fixed filter 57. The clean air filtered by the filter 57 passes through the suction pipe 59 and the roots type blower 60 and is discharged from the exhaust port 62 of the exhaust tank 61 to the outside.

  On the other hand, by switching the operation of the roots type blower 60 from forward rotation to reverse rotation, backwash air is sucked from the exhaust side 60b of the blower 60, and the pressure of the backwash air is increased and introduced into the rotary nozzle 56. Is done. Thereby, the fixed filter 57 is washed, and the fumes are dropped and stored in the lower collection container 58. The air that has passed through the fixed filter 57 is filtered by a backwash filter and released to the atmosphere.

(Experiment 1)
About the fume recovery machine C of the present invention, the performance of collecting fumes having viscosity generated during the welding operation of the welded iron material coated with rust preventive oil, and the pressure loss between the suction hood and the inlet of the roots blower ( The experiment was conducted under the following conditions. The results are shown in the graph of FIG.
1st collection part Filter material: Mesh 0.3 μm, diameter 200 mm × length 200 mm
There is a slit in the convex part of the ridge. Filter rotation speed: 2500rpm
Motor device output: 0.4 kW
Second collection unit 50
Fixed filter: Mesh 0.3 μm, diameter 200 mm × length 200 mm
Roots-type blower: Diameter 50mm x Output 1.5kw, Rotation speed 2500rpm
Discharged air amount 1.5 m ³ / min Viscous fume generation amount: 15.77 mg / m ³
However, “backwashing” during the operation shown in the graph was performed three times for 30 seconds.
“Rest” was the time when only the welding operation was interrupted and the operation of the fume collecting machine C was continued.

As a result of the experiment, it was confirmed that the amount of fume dust measured on the exhaust side of the Roots-type blower was approximately 0.05 mg / m ³ or less, and a good collection effect was obtained. Further, the pressure loss between the suction hood and the suction port of the Roots-type blower was stable in the range of −6 to −13 kPa.

(Experiment 2)
Experiments were performed on the conditions according to Experiment 1 for the collection performance of the first collection section when a filter material without a slit was used. The result is shown in the graph of FIG.

As a result of the experiment, the amount of fume dust measured on the exhaust side of the first collection unit was approximately 0.05 mg / m ³ . However, the pressure loss increased to −30 kP after 11 minutes from the start of operation and to −40 kP after 35 minutes, and was found to be unsuitable for use.

  As described above, this fume collecting machine collects viscous fumes by the rotary filter of the first collection unit, and flows in from the first collection unit by the fixed filter of the second collection unit. Since it is configured to collect the fumes remaining in the air, it is possible to efficiently collect the fumes having viscosity generated from the antirust oil / paint applied to the weld iron material during the arc welding operation.

Illustration of fume recovery machine Vertical side view of the first collection part Longitudinal front view of rotary filter Explanatory drawing of convex part of rotary filter The graph which shows the collection experiment result of the fume collection machine C of this invention The graph which shows the collection experiment result of the 1st collection part using the filter material which does not provide a slit

Explanation of symbols

C ... fume collecting machine 1 ... frame 5 ... suction pipe 10 ... first collecting part 11 ... case 25 ... motor device 28 ... rotating shaft 31 ... rotary type Filter 34 ... Filter material 35 ... ridge 35a ... Convex part 36 ... Slit 50 ... Second collection part 51 ... Tank 55 ... Suction pipe 57 ... Fixed type Filter 60 ... Roots blower

Claims (1)

A first collecting section that collects the fumes having viscosity generated by welding together with the surrounding air from the suction pipe and collects the fumes, and collects fumes remaining in the air flowing from the first collecting section. A second collecting part to be collected and a roots type blower connected to the exhaust side of the second collecting part and capable of forward / reverse switching operation are installed in the frame;
About the 1st collection part, it is a cylindrical shape using the cage- like nonwoven fabric of mesh 0.3 micrometer-1 micrometer in the tip part of the axis of rotation provided in the housing of a case so that rotation may be faced in the case concerned It is formed on, and a filter material in which the slit in the convex portion of the fold is formed which is located on the radially outer side, fitted with a rotary filter mounted on the outer periphery of the porous cylindrical core, the rotary filter motor Provided to rotate by the device,
About the 2nd collection part, the suction which attached the fixed filter formed in the shape of a cylinder using the basket-like nonwoven fabric of mesh 0.3micrometer-1micrometer in the tank connected to the exhaust side of the 1st collection part A pipe is arranged so that the suction side of the roots-type blower is connected to the exhaust side of the suction pipe, and the outside air sucked during the reverse operation of the roots-type blower is discharged to the inner surface of the fixed filter. A fume collecting machine characterized in that the apparatus is configured to wash.

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