KR100194700B1 - Welding fume recovery device - Google Patents

Abstract

(Problem) Provided is a welding fume recovery device capable of reducing the sound at the time of fume recovery and improving the cleaning efficiency of the recovered fume.

(Solution means) The welding fume recovering device 41 includes a suction blower 51 which sucks dust containing air including a welding fume and a welding spatter between the suction ports 42 and the dust containing air. A pre-filter 43 for removing the welding spatter, a main filter 45 for removing the dust, an exhaust port 52 for discharging the exhaust gas from which the dust has been removed, and the main of the exhaust gas Disturbing plates 54a and 54b which are disposed at the outlet 52 of the exhaust path from the filter 45 to relax the noise of the exhaust gas, and the main filter 45 of the exhaust gas of the exhaust gas. A sound absorbing material 53 for reducing the sound at the time of discharge of the exhaust gas disposed in the exhaust port 52 portion of the exhaust path or the obstruction plate and the inner side of the dust collecting surface of the main filter 45 A gas tank 55 having a nozzle 56 for ejecting gas onto the pulse jet; Have.

Description

Welding fume recovery device

1 is a schematic perspective view showing the structure of a welding fume recovery device according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing the flow of exhaust gas when the fume is recovered by using the welding fume recovery device shown in FIG.

FIG. 3 is a schematic sectional view showing the operation of the compressed gas when cleaning the filter using the welding fume recovery apparatus shown in FIG.

4 is a graph showing the relationship between the work environment wind speed, the suction wind amount and the suction efficiency η by taking the wind speed of the working environment on the horizontal axis and the suction air volume on the vertical axis.

5 is a graph showing the relationship between the welding current, the suction air flow rate and the suction efficiency by taking the welding current on the horizontal axis and the suction wind speed on the vertical axis.

FIG. 6 shows the velocity (filter passing wind velocity) when the gas containing the welding fume on the horizontal axis passes through the main filter, and the bulk density of the recovered fume attached to the main filter on the vertical axis. It is a graph showing the relationship between the passing wind velocity and the bulk density of the recovered fume.

7 shows the arc time on the horizontal axis, the passing flow rate (m / sec) in the suction hose when the suction hose having a diameter of 38 mm is used on the vertical axis, and pressurized compressed gas having a pressure of 2 kgf / cm 2 (2 atm) It is a graph showing the relationship between the arc time and the flow velocity in the suction hose when blown out per pulse of 3, 5 or 7 strokes (repeats).

8 shows the arc time on the horizontal axis and the passing flow rate (m / sec) in the suction hose when the suction hose having a diameter of 38 mm is used on the vertical axis to obtain a pressure of 2,3 or 5 kgf / cm2 (2,3). Or 5 atm) is a graph showing the relationship between the arc time and the flow velocity in the suction hose when the compressed gas is blown out in a pulse of one stroke per stroke.

FIG. 9 shows the arc time on the horizontal axis and the passing flow rate (m / sec) in the suction hose when a suction hose with a diameter of 38 mm is used on the vertical axis, and pressurized gas having a pressure of 3 kgf / cm 2 (3 atm) Alternatively, it is a graph showing the relationship between the arc time and the flow velocity in the suction hose when it is discharged in a pulse of 5 strokes.

10 is a side view showing an example of the entire welding apparatus using the recovery apparatus according to the present embodiment.

11 is a side view showing another example of the entire welding apparatus using the recovery apparatus according to the present embodiment.

12 is a schematic side view showing still another example of the entire welding apparatus using the recovery apparatus according to the present embodiment.

13 is a side view showing an example of a welding fume suction torch.

14 is a schematic cross-sectional view showing an example of the cable hose.

15 is an enlarged side view of the torch tip.

16 is a schematic side view showing an example of a conventional welding fume recovery apparatus.

* Explanation of symbols for main parts of the drawings

41: recovery device 42: suction port

43: pre-filter 44,48,58a, 58b: partition plate

45: main filter 46: dust box

47: distillation wing 51: blower motor

52: outlet 53: sound absorbing material

54a, 54b: baffle plate 55: compressed gas tank

56: nozzle 59: fan

60: filter chamber 61,62,63: exhaust chamber

64: tank room

[Industrial use]

The present invention relates to a welding fume recovery apparatus for recovering the welding fume generated by welding, and keeps the working environment clean.

[Prior art]

In the case of performing a welding operation in a factory, a business office or the like, it is necessary to remove the welding fume generated by the welding operation from the working environment and to maintain the working environment in a good state. As a method of removing the welding fume, a welding torch having a suction hood attached to collect the welding fume at the distal end of the welding torch has been proposed (JP-A 51-20305). In order to reduce the weight of the welding torch, a welding fume suction torch having coaxially provided with a shield gas discharge nozzle for discharging the shield gas and a suction nozzle for sucking the welding fume at the tip of the torch, It is actually used.

13 is a side view showing an example of this type of welding fume suction torch. At the torch tip, a shield gas nozzle (11) for discharging the shield gas is disposed. The suction nozzle 12 is coaxially disposed on the gas ejection nozzle 11 at a position slightly rearward of the front end of the sealed gas ejection nozzle. The main surface of the suction nozzle 12 is provided with a hole 12a for sucking welding fume. These sealed gas ejection nozzles 11 and the suction nozzles 12 are supported by the elbow tube 13, and the elbow tube 13 is supported by the clip portion 14. The clip portion 14 is provided with a suction force adjusting hole 14a, and the amount of gas sucked from the suction nozzle 12 can be adjusted.

A band mechanism 15 is provided between the clip portion 14 and the cable hose 16 to facilitate bending of the torch. An adapter connecting portion 17 is provided at the rear end of the cable hose 16. In addition, the adapter connection part 17 is provided with the hose connection port 17a, and is connected to the fume recovery apparatus via the connection hose.

In addition, the adapter 18 is connected to the adapter connection part 17. The adapter 18 is provided with a shield gas supply hole 18a and an electric cable connector 18b. The shielding gas and the welding power are supplied to the welding torch between the adapters 18.

14 is a schematic cross-sectional view showing an example of a cable hose. As shown in FIG. 14, the cable hose 16 is a double pipe, for example. That is, the 2nd pipe arrange | positioned inside the 1st pipe | tube 23 is comprised by the power cable 22 and the coating | covering material 21 which coat | covers the outer side of this power cable 22. As shown in FIG. Further inside the power cable 22, a liner 20 (for example, a spring liner, etc.) is disposed as a third pipe, and a welding wire passes through the liner 20. The shield gas flows between the liner 20 and the power cable 22. In addition, a gas drawn from the suction nozzle 12 flows between the rubber coating material 21 and the first teeth 23.

15 is an enlarged side view of the torch tip. After the shield gas A passes between the liner 20 and the power cable 22, the shield gas A is discharged from the shield gas discharge nozzle 11 at the tip of the torch. As a result, the welded portion is blocked from the air, and oxidation of the welded metal and the like is prevented. On the other hand, gas B outside the shield gas region near the welded portion is sucked from the hole 12a provided in the suction nozzle 12. The gas sucked from the suction nozzle 12 contains a welding fume generated by welding. The gas containing this welding fume passes between the rubber coating material 21 of the cable hose 16 and the first pipe 23, and connects the hose connected to the hose connection port 17a of the adapter connection part 17 with the hose. Enter the welding fume recovery system.

16 is a schematic side view showing an example of a conventional welding fume recovery apparatus. The welding fume recovery device 31 is provided with a filter 32 for trapping the welding fume, a fan 33 for generating a suction force, and a motor 34 for rotating the fan 33.

In the recovery apparatus configured as described above, the gas drawn from the suction nozzle 12 shown in FIG. 15 passes through the filter 32. Therefore, by attaching the welding fume to the filter 32, it can be efficiently recovered.

By the way, the filter used for such a collection | recovery apparatus is a thing disposable and can be cleaned and reused. Since the welding fume collected in the filter is microparticles and the amount of generation thereof is extremely large, it is necessary to replace them frequently in the case of single use, which is uneconomical. On the other hand, in the case of cleaning and using the filter, a method of removing the welding fume by blowing air from the inside of the collecting surface is generally used. By using this principle, a welding fume recovery apparatus having a cleaning function of a filter has been proposed (Japanese Patent Laid-Open No. 5-329651). The recovery device is provided with a suction part for recovering the welding fume and a welding shield gas composed of a gas heavier than air, particularly preferably CO ₂ , Ar, and a mixed gas thereof, in a pulse form on the inner side of the filter collecting surface. It has a flushing vent. Thus, the filter can be easily cleaned by providing the function for filter cleaning in a collection | recovery apparatus.

Moreover, as a welding fume recovery apparatus, there exist some disclosed by Unexamined-Japanese-Patent No. 7-266053.

[Problems that the invention tries to solve]

However, in the conventional welding fume recovery apparatus shown in Japanese Patent Laid-Open No. 5-329651, there is a problem that noise is generated from the suction portion and the exhaust gas discharge portion during fume recovery. Also, no noise is mentioned in the welding fume recovery apparatus disclosed in Japanese Patent Laid-Open No. 7-266053.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a welding fume recovery apparatus capable of reducing the sound at the time of fume recovery and increasing the cleaning efficiency of the recovered fume.

[Means for solving the problem]

The welding fume recovering apparatus according to the present invention includes a suction blower for sucking dust-containing air containing dust including welding fume and welding spatter through a suction port, a pre-filter for removing the welding spatter from the dust-containing air; And a main filter for removing the dust, an exhaust port for discharging the dust from which the dust is removed, and a discharge port portion of the exhaust path from the main filter of the exhaust gas to alleviate the flow of the exhaust gas. On the inner side of the noise blocking plate, the sound absorbing material disposed in the outlet portion of the exhaust path from the main filter of the exhaust gas or the blockage plate to reduce the sound when the exhaust gas is discharged, and the dust collecting surface of the main filter. And a compressed gas tank having a nozzle for ejecting compressed gas onto a pulse jet.

Moreover, it is preferable to have the still filter which distills the compressed gas blown out from the said nozzle between the said main filter and the said nozzle.

Furthermore, it is preferable that the said main filter is columnar shape, such as a columnar shape, an elliptic cylinder shape, and a prismatic pillar shape, and is arrange | positioned perpendicularly to the longitudinal direction.

[Action]

In the welding fume recovery apparatus according to the present invention, a baffle plate is disposed at an outlet portion of an exhaust path of exhaust gas from which dust is removed by a prefilter and a main filter. Since the obstruction plate is provided to alleviate the momentum of the exhaust gas flow by the resistance, the obstruction plate weakens the moment when the exhaust gas is discharged from the discharge port during the recovery of the fume, and reduces the sound at the discharge. can do. Furthermore, since the sound absorbing material is disposed in the discharge port portion or the baffle plate, the sound generated when the exhaust gas is discharged can be further reduced by this sound absorbing effect.

In addition, in this invention, compressed gas is used as a gas used when cleaning a filter. This compressed gas is not limited to a shield gas or the like that is heavier than air, and also includes air and the like. As the compressed gas supply source, for example, a gas cylinder such as compressed air or a sealed gas cylinder may be used, or gas may be supplied using a concentrated pipe of a factory. If a gas cylinder such as compressed air or a factory concentrated piping is used in place of the shield gas having a high raw material cost, the running cost during cleaning of the filter is reduced.

Furthermore, in this invention, the passage velocity of the gas containing a welding fume is made into 0.01 m / ch using the filter whose pass particle diameter is 0.5 micrometer or less. Then, the welding fume contained in the welding fume-containing gas is brought into contact with the filter at high speed, and solidified into scale pieces by the pressure at the time of contact, and collected in the filter. This scaly-shaped fume is difficult to scatter because of its bulk density and, for example, does not scatter even in a wind of 3 to 4 m / min. Therefore, there is no fear that the fume treated during the cleaning of the filter is scattered and pollution of the environment can be prevented.

However, in the case where the passing particle diameter of the filter exceeds 5 µm or the filter passing rate of the welding fume-containing gas is less than 0.01 m / sec, the fume collected in the filter becomes planar and the bulk density is low, thus scattering. It becomes the state that it is easy to do. Therefore, it is preferable that the passing particle diameter of a filter is 0.5 micrometer or less, and the speed at the time of the filter passing of a welding fume containing gas shall be 0.01 m / sec or more.

Further, in the fume recovery operation, when the conditions of the working environment or the welding current are compared in the same manner, the larger the suction wind amount, the higher the suction efficiency. Therefore, the maximum static pressure of the suction blower is preferably 1000 mm or more.

Further, after stopping the suction of the welding fume-containing gas, the fume emits pulse jet gas (compressed gas) from the inside of the filter trapping surface attached to the scale pieces, but when the jet pressure is 2 kgf / cm 2 or more, the scale pieces The fume can be more easily separated from the filter.

By the way, the side surface of the main filter used for the conventional welding fume recovery apparatus is usually formed with the wall in order to enlarge the surface area. Therefore, when the main filter on the column with a wall formed in the longitudinal direction is used and the main filter is arranged vertically in the longitudinal direction, the welding fume easily falls.

Further, in the present invention, if a distillation apparatus is disposed between the nozzle through which the compressed gas is ejected and the main filter, the compressed gas is distilled from the nozzle, so that the impact is further increased by the inside of the fume collecting surface of the main filter. This is applied. The distillation apparatus includes a venturi tubular distillation tube whose throat part is larger than the jet port of the nozzle or a distillation vane formed of a plurality of plate members arranged to open toward the nozzle on the main filter side. Since the distillation vane is arranged so that the passage of the compressed gas ejected from the nozzle is narrowed, the cross-sectional area of the gas flow is narrowed and the flow velocity is large. It is preferable to use a plate-shaped distillation vane as the distillation apparatus because it can be produced more easily than the venturi tubular distillation tube, and the manufacturing cost thereof can be reduced.

Thus, the fume which peeled from the main filter by the impact from a compressed gas accumulates in the dust box arrange | positioned under the filter, for example. In this way, the filter can be cleaned without removing the filter from the apparatus, which greatly simplifies the cleaning of the filter and increases the cleaning efficiency of the recovered fume.

EXAMPLE

Best Mode for Carrying Out the Invention Embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a schematic perspective view showing the structure of a welding fume recovery device according to an embodiment of the present invention. FIG. 2 is a schematic sectional view showing the flow of exhaust gas when the fume is recovered using the welding fume recovery device shown in FIG. 1, and FIG. 3 is the welding fume recovery device shown in FIG. It is typical sectional drawing which shows the operation | movement of the compressed gas at the time of cleaning a filter.

The recovery device 41 is formed in a box shape and is constituted by the filter chamber 60, the first exhaust chamber 61, the second exhaust chamber 62, and the tank chamber 64.

In the filter chamber, a suction port 42 connected to a suction hose (not shown) that sucks in a dust containing gas containing a welding fume and a welding spatter is formed in the side surface. Then, the pre-filter 43 for removing the welding spatter from the dust-containing gas sucked from the suction port 42 at a position slightly separated from the wall surface on which the suction port 42 is formed in the filter chamber 60. Is arranged. The first exhaust chamber 61 is formed in the upper portion of the filter chamber 60, and the first partition plate 44 having the vent hole 49 is disposed between the filter chamber 60 and the first exhaust chamber 61. ) Is the membrane. Moreover, the main filter 45 which removes a welding fume from dust containing gas is provided in the filter chamber side so that the ventilation hole 49 of this 1st partitioning board 44 may be covered. The main filter 45 is, for example, pillar-shaped, and is installed with its longitudinal direction vertical, and the side surface is formed of a filter. Further, below the main filter 45, a dust box 46 which receives welding fumes falling from the filter during cleaning of the filter and the like is provided.

On the side of the first exhaust chamber 61 of the first partitioning plate 44, for example, a distillation blade 47 made of two sheets of material is arranged in a V shape so as to face upward from the vent hole 49. It is.

The second exhaust chamber 62 is formed on the side of the first exhaust chamber 61, and the first exhaust chamber 61 and the second exhaust chamber 62 have a second partition plate having an exhaust hole 50 ( 48) by the mesentery. The second partitioning plate 48 partitions the filter chamber 60 and the second exhaust chamber 62, but the exhaust hole 50 is formed between the first exhaust chamber 61 and the second exhaust chamber 62. It is installed in between. The second exhaust chamber 62 is provided with a blower motor (suction motor) 51 for sucking the exhaust gas from which dust has been removed through the exhaust hole 50. In addition, a third exhaust chamber 63 is formed between the second exhaust chamber 62 and between the third partitioning plate 58a, and the blower motor 51 is cooled in the third exhaust chamber 63. The fan 59 for disposing is arranged. Discharge ports 52 are formed below the second exhaust chamber 62 and the third exhaust chamber 63 to discharge the sucked exhaust gas to the outside of the recovery device 41, and the second exhaust chamber 62 is disposed. In the exhaust path of the exhaust gas in the third exhaust chamber 63, an obstruction plate 54a is provided for mitigating the noise of the exhaust gas. Moreover, the sound absorption material 53 for reducing the sound at the time of exhaust is arrange | positioned at the discharge port 52.

On the side of the third exhaust chamber 63, a compressed gas tank 55 filled with gas is provided in the tank chamber 64 provided with the fourth partitioning plate 58b therebetween so as to eject the pulse jet. A nozzle 56 is connected to the compressed gas tank 55. The nozzle 56 has a compressed gas ejected from the compressed gas tank 55 from the vent hole 49 of the first partitioning plate 44. The second exhaust chamber 62 extends to the upper portion of the distillation blade 47 of the first exhaust chamber 61 so as to be ejected into the interior of the 45. In addition, the side wall of the tank chamber 64 is provided with a connection port 57 for connecting the outside and the compressed gas tank 55, and the compressed gas tank 55 from the main tank (not shown) provided outside the recovery device. ) To replenish compressed gas.

Next, in the welding fume recovery apparatus configured as described above, the operation at the time of fume recovery will be described.

As shown in FIG. 2, by the operation of the blower motor 51, the dust-containing air containing the welding fume, etc., passes through a suction hose (not shown) from the suction port 42 to the filter chamber 60. Aspirated. At this time, coarse particles such as metal powder and spatter contained in the dust-containing air are removed by the prefilter 43. Subsequently, the dust-containing air is sucked into the first exhaust chamber 61 through the main filter 45. At this time, fine particles such as a welding fume are collected by the main filter 45. Thereafter, the exhaust gas purified by the prefilter 43 and the main filter 45 passes through the vent hole 49, the first exhaust chamber 61, the exhaust hole 50, and the second exhaust chamber 62. The discharge port 52 is discharged to the outside of the recovery device. While the blower motor 51 is in operation, the cooling fan 59 is operated to prevent the blower motor from being heated.

When the welding fume recovery apparatus according to the present embodiment is used, since the dust is removed in two stages by the prefilter 43 and the main filter 45, the effect of removing the dust contained in the dust-containing air is excellent. In addition, when the exhaust gas from which dust has been removed is discharged into the recovery device 41, the noise generated in the conventional recovery device is reduced by the effect of the obstruction plate 54a and the sound absorbing material 53.

4 is a graph showing the relationship between the working environment wind speed, the suction wind amount, and the suction efficiency η, taking the wind speed of the working environment on the horizontal axis, the suction wind amount on the vertical axis. Further, this suction efficiency η is expressed as (aspirated trapped fume amount) / (total fume generated amount under predetermined welding conditions). As shown in FIG. 4, as the working environment wind speed increases, the suction wind amount also needs to be increased. However, in the same working environment wind speed, the larger the suction wind amount, the higher the suction efficiency.

5 is a graph showing the relationship between the welding current, the suction wind amount, and the suction efficiency by taking the welding current on the horizontal axis and the suction air amount on the vertical axis. As shown in FIG. 5, as the welding current increases, the suction wind amount also needs to be increased. However, when the same welding current is used, the suction efficiency increases when the suction air amount is larger.

In this way, when compared under the same conditions (work environment, welding conditions), as described in FIGS. 4 and 5, the suction efficiency increases as the amount of suction wind increases. The suction blower used in the welding fume collecting device tends to decrease its static pressure as the suction wind volume increases, but the suction blower has a positive pressure of at least 1000 mm Aq or more in consideration of the external pressure loss of the main body and the duct. In addition, the present invention can be applied to a system having a long duct as shown in FIGS. 11 and 12 described later.

Next, the operation | movement at the time of filter cleaning is demonstrated. If the welding operation is repeated and the welding fume collected in the main filter in the filter chamber is accumulated in excess of the allowable amount, the filter needs to be cleaned. Usually, this cleaning operation is carried out other than at the time of the welding operation, that is, when the blower motor is stopped.

As shown in FIG. 3, the gas compressed and filled in the compressed gas tank 55 passes through the nozzle 56, and the main filter 45 passes from the nozzle tip portion 56a in the first exhaust chamber 61. As shown in FIG. ) Is ejected on the pulse jet inside. At this time, the ejection pressure of the ejected compressed gas (gas jet) is increased by the distillation blade (47). Subsequently, the gas jet is blown out from the inside of the filter to the outside while vibrating the main filter 45 by the impact on the main filter 45, and exhausted from the suction port 42 of the filter chamber 60.

Due to the vibration of the filter, dust such as fume adhered to the outer surface of the main filter 45 peels off and falls. When the fallen fume and the like are accumulated in the dust box 46, the dust box 46 is removed and the fume is treated just like ordinary dust. In this case, the recovered fume is hardened in the form of scales and is difficult to scatter because of its bulk density. Therefore, the fume can be recovered without contaminating the environment.

FIG. 6 shows the velocity (filter passing wind velocity) when the gas containing the welding fume on the horizontal axis passes through the main filter, and the bulk density of the recovered fume attached to the main filter on the vertical axis. It is a graph showing the relationship between the passing wind speed and the bulk density of the recovered fume. As shown in FIG. 6, when the passing particle diameter of the filter is 0.5 µm or less, and the filter passing air velocity is 0.01 m / sec or more, the bulk density of the recovered fume becomes 0.20 g / cm 3 or more, and the recovered fume is scaled. It solidifies into a statue. On the other hand, when the passing particle diameter of the filter exceeds 0.5 µm and the filter passing wind velocity is less than 0.01 m / sec, the recovered bulk has a bulk density of less than 0.20 g / cm 3 and becomes planar (negative). Such a fume is extremely easy to scatter. Therefore, it is preferable that the passing particle diameter of the main filter is 0.5 µm or less, and the wind speed of the welding fume-containing gas passing through the main filter is 0.01 m / sec or more.

7 shows the arc flow time on the horizontal axis and the passing flow rate (m / sec) in the suction hose when the suction hose having a diameter of 38 mm is used on the vertical axis, and pressurized gas having a pressure of 2 kgf / cm 2 (2 atm) It is a graph which shows the relationship between the arc time and the flow velocity in a suction hose when sprayed in pulse form in 5 or 7 strokes (repeats). As shown in FIG. 7, when the arc time is long, the one with the higher number of strokes has a larger recovery of the passage flow rate in the suction hose.

8 shows the arc time on the horizontal axis, the passage flow rate (m / sec) in the suction hose when the suction hose having a diameter of 38 mm is used on the vertical axis, and the pressure of the compressed gas is 2, 3 or 5 kgf / cm 2 (2, 3 or 5 atm), and is a graph showing the relationship between the arc time and the flow velocity in the suction hose when compressed gas is blown out in a pulse of one stroke per stroke. As shown in FIG. 8, when the arc time is long, the higher the pressure of the compressed gas, the greater the recovery of the passage flow rate in the suction hose.

Figure 9 shows the arc time on the horizontal axis, the passing flow rate (m / sec) in the suction hose when the suction hose with a diameter of 38 mm is used on the vertical axis, and pressurized gas having a pressure of 3 kgf / cm2 (3 atm) Or it is a graph which shows the relationship between the arc time and the flow velocity in a suction hose when sprayed in the pulse form of 5 strokes. As shown in Fig. 9, when the pressure of the compressed gas is 2 kgf / cm < 2 >, if the number of strokes is 3 or more, there is no significant difference in the recovery rate of the passage flow rate in the suction hose.

10 is a side view showing an example of the entire welding apparatus using the recovery apparatus 41 according to the present embodiment.

A shield gas cylinder 70 is disposed outside the welding fume recovery device 41, and a shield gas supply hose 73 having a pressure regulating valve 71 is connected to the shield gas cylinder 70. The shield gas supply hose 73 is connected to the welding torch 80 to supply the shield gas at the time of welding. In the welding torch 80, for example, a suction hood is provided to suck the welding fume, and the welding torch 80 and the suction port 42 of the recovery device 41 are connected by a suction hose 79. . Further, the welding torch 80 is connected with a first cable 77a from a power supply device 76 that supplies current for welding, and a second cable 77b extending from the power supply device 76 is welded. It is connected to the base material 82. In addition, a main tank or a factory intensive piping (not shown) for supplying compressed gas to the compressed gas tank in the recovery device 41 is connected to the recovery device 41 through a gas tank supply hose 75. have. Further, on the recovery device 41, a wire supply device 78 for automatically supplying a wire to the welding torch 80 is mounted. In the recovery device 41 shown in FIG. 10, a shield gas that is heavier than air may be used as the compressed gas.

11 is a side view showing another example of the entire welding apparatus using the recovery apparatus according to the present embodiment, and FIG. 12 is a schematic side view showing another example of the entire welding apparatus using the recovery apparatus according to the present embodiment. . In FIG. 11 and FIG. 12, the same code | symbol is attached | subjected to what is shown in FIG. 10, and detailed description is abbreviate | omitted.

As shown in FIG. 11, this welding apparatus uses the welding robot 86. As shown in FIG. The two suction hoses 79a and 79b extending from the welding fume recovery device 41 are supported by a balancer 85 attached to the hanging beam 84, and the suction block portion of the tip of the welding robot 86 ( 83). In addition, the power supply device 76 supplies the welding robot 86 with the current for welding by the first cable 77a, and supplies the current to the welding base material 82 by the second cable 77b. The first cable 77a is also supported by the balancer 85 together with the suction hoses 79a and 79b.

In addition, as shown in FIG. 12, this welding apparatus uses the automatic welding machine, and can collect | recover the welding fume etc. which generate | occur | produce from four welding parts, with one collection | recovery apparatus 41. As shown in FIG. At the time of welding, the welding torches 80a and 80b or 80c and 80d of two sets are welded simultaneously on both sides of the welding base materials 82a and 82b arranged in a T shape with the upper and lower sides reversed. have. The pair of suction block portions 83a and 83b are connected to two ducts 88a and 88b, respectively, and are joined to one suction hose 79a before being connected to the recovery device 41. The other pair of suction block portions 83c and 83d are also connected to the two ducts 88a and 88b and joined to the suction hose 79b. Therefore, two suction hoses 79a and 79b from two sets of suction block portions are connected to the recovery device 41.

In the welding apparatus configured as described above, current is supplied from the four power supply units 76a, 76b, 76c, and 76d to the four welding torches by the cables 87a, 87b, 87c, and 87d, respectively, and the welding base material 82a and The welding fume and the like are sucked from the suction block portions connected to the respective welding torches at the same time as the welding of 82b), and recovered by the recovery device 41.

Thus, the welding fume recovery apparatus according to the present invention can be applied to any of the welding torch for semi-automatic, automatic and robot. As a means for collecting the welding fume, a suction hood may be attached to the welding torch, or a suction torch as shown in FIG. 13 may be used.

1, 10, 11 and 12 show a current sensor 90 for detecting a welding start signal and a welding end signal. When the welding operation starts, the current sensor 90 detects the welding current. A control device (not shown) in the welding fume recovery device supplies current to the blower motor 51 based on the output of the current sensor 90 to start the blower motor 51 operation. As a result, the gas containing the welding fume is sucked from the suction blower 83 provided at the tip of the welding torch 80. When the welding is stopped, the supply of the welding current to the welding torch 80 is stopped, so that the output of the current sensor 90 changes. A control device (not shown) detects the stop of welding by the output change of this current sensor 90.

Then, the control device (not shown) continues the supply of power to the blower motor 51 for a predetermined time even after detecting the stop of welding. If welding is started within this time, the supply of power to the blower motor 51 is continued. If welding is not started, the supply of power to the blower motor 51 is stopped. In addition, the fume attached to the outer surface of the main filter 45 by giving a signal to the solenoid valve (not shown) equipped in the welding fume recovery device and ejecting the gas to the inner surface of the main filter 45 in the form of a jet pulse. Peel off dust, etc. Thus, by peeling off dust, such as a fume, recovery efficiency returns to a predetermined state.

[Effects of the Invention]

As described above, according to the present invention, since the baffle plate is disposed in the exhaust port portion of the exhaust path of the exhaust gas after the welding fume and the like are removed, the sound absorbing material is disposed in the exhaust portion portion or the obstruction plate. Therefore, the sound at the time of recovering the generated fume can be reduced. In addition, if the gas pressure of the compressed gas is set to an appropriate amount and the cylindrical main filter is arranged vertically in the longitudinal direction, the fume and the like attached to the filter easily fall, so that a high clean effect can be obtained.

Claims (9)

A suction blower 51 for sucking dust-containing air containing dust including welding fumes and welding spatters through the suction port 42, and a pre-filter 43 for removing the welding spatter from the dust-containing air; And a main filter 45 for removing the dust, an exhaust port 52 for discharging the exhaust gas from which the dust is removed to the outside, and an exhaust port portion of the exhaust path of the exhaust path from the main filter of the exhaust gas. Baffles 54a and 54b to reduce noise and reduce noise, and a sound absorbing material disposed in the outlet portion of the exhaust path from the main filter of the exhaust gas or the baffle plate to reduce sound when the exhaust gas is discharged. 53) and a compressed gas tank (55) having a nozzle (56) for ejecting compressed gas into a pulse jet on the inner side of the dust collecting surface of the main filter (45). The welding fume recovery apparatus according to claim 1, further comprising a distillation apparatus (47) for distilling compressed gas ejected from the nozzle between the main filter (45) and the nozzle (56). 3. The welding fume recovery apparatus according to claim 2, wherein the distillation apparatus (47) is a venturi tube-shaped distillation tube whose throat part is larger than the ejection opening of the nozzle (56). The distillation apparatus (47) according to claim 2, wherein the distillation apparatus (47) is a distillation blade (47) formed by two or more sheets of sheet material arranged to open from the main filter (45) toward the nozzle (56). Welding fume recovery device. The welding fume recovery apparatus according to claim 1, wherein the main filter (45) is in a columnar shape and is disposed with its longitudinal direction vertical. The welding fume recovery apparatus according to claim 1, wherein the main filter (45) has a filtration particle diameter of 0.5 µm or less, and a wind speed at which the welding fume-containing gas passes through the main filter is 0.01 m / sec or more. The welding fume recovery apparatus according to claim 1, wherein the maximum static pressure of the suction blower (51) is 1000 mm or more. The welding fume recovery apparatus according to claim 1, wherein the blowing pressure of the compressed gas ejected from the compressed gas tank (55) is 2 kgf / cm 2 or more. 2. The detection means (90) according to claim 1, wherein the detection means (90) for detecting the generation and stop of the welding arc, the start and stop of driving of the suction blower (51) based on the detection result of the detection means, and the compressed gas tank (55). And an interlocking means for determining the start and stop of the operation of ejecting the compressed gas.