JP2898821B2 - Weld fume recovery equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus used in the field of welding technology and, more particularly, to an apparatus for collecting fume scattered at a welding point.

[0002]

2. Description of the Related Art During a welding operation, fumes are scattered from a welding location. The fume is fine dust containing molten metal and is harmful to the human body. Workers wear masks for this purpose, but they are still harmful to others in the factory, and they are not an active measure. Also,
Fumes are also collected by installing a stationary hood above the welding operation position. However, since the distance from the welding point to the hood is large, the size of the hood is increased, and the hood cannot be used anymore when the working position is moved.
Therefore, recently, a suction hood is integrally attached to a torch, and the fume is directly collected by a fume collection device before being scattered around by a suction hose connected to the suction hood. This fume collecting device has a built-in blower and generates a suction force. The sucked fume is collected by the electrode or the filter.

[0003]

However, when the welding fume is collected by the electrode, the electrode must be washed with a solvent or the like in accordance with the deposition of the collecting fume, and the work is complicated. It is also expensive.

On the other hand, a so-called disposable filter, which is replaced with a new one without cleaning, and a filter which is cleaned by blowing air on a surface (rear surface) opposite to a collecting surface. Some are used again. In that case, 90% of the welding fume is 0.5 μm
Since the former is composed of the following fine particles and the amount of generation is extremely large, the former requires frequent replacement and is uneconomical. In the latter case, the air for blowing must be piped to the fume collection device, which makes the equipment complicated,
There is a problem that it cannot be used in a place where there is no compressed air source or a compressor must be separately prepared.

The present invention solves such a problem, and does not use compressed air for cleaning the filter, but uses a welding system heavier than air.
Rudogasu, CO ₂ for welding particularly suitable from, A _r
And a filter that can use a small amount of shielding gas for cleaning and can be reduced in size by cleaning the filter using a large inertial collision force by a part of the shielding gas such as a mixed gas thereof. It is an object of the present invention to provide a welding fume recovery apparatus using a shielding gas having a gas.

[0006]

According to the present invention, the above object is attained by first removing welding fume dust deposited on one surface of a filter from a direction opposite to an air flow of filter filtration .
This is achieved according to a first aspect of the present invention, which includes a nozzle for ejecting a shielding gas onto a pulse jet on the other surface of the filter.

Further, a suction hood for collecting fume scattered at a welding point is attached to a torch, and the fume is collected by a fume collection device via a suction hose connected to the suction hood. Wherein the fume recovery device includes a suction unit and an ejection unit, and the suction unit has a first chamber and a second chamber separated by a partition wall having a communication hole, and the first chamber has a space covering the communication hole. The filter is exchangeably disposed so as to form a filter, and the suction hose is connected to a space opposite to the communication hole with respect to the filter, and the first chamber is a suction space sucked by a blower. A nozzle that is formed and is provided at the ejection portion and is filled with a shielding gas, and a nozzle that ejects the shielding gas in the tank in a pulsed manner into the communication hole at a predetermined time is provided in the second chamber. Also achieved by the second invention to be are facing in provided.

The filter is formed in a cylindrical shape so as to cover the communication hole, and its internal space is partitioned into a plurality of spaces opened to the communication hole side, and each of the spaces in which the nozzle and the communication hole are partitioned. It is good to be provided corresponding to each.

[0009]

The present invention having such a structure operates as follows. [I] Fume Recovery At the time of fume recovery, that is, at the time of welding work, in the first invention, the fume sucked by a suitable device such as a blower is collected by a filter. According to the second aspect of the present invention, only the suction unit is normally operated, and the ejection unit is not operating. The fume generated by welding is sucked from the suction cover by the suction force of the blower of the suction unit, and the suction hose is sucked. Through the first chamber, where it is collected by a filter. [II] At the time of cleaning the filter Usually, the cleaning of the filter is performed at a time when the welding operation is not performed. Therefore, the blower is not operating at this time. First, in the first aspect, the welding shielding gas is blown from the back side as a pulse jet to the dust collecting surface of the filter, whereby the fume falls. In the second invention, the shield gas in the tank is pulsated from the nozzle by a valve that is turned on and off, and the blasted gas collides with the surface opposite to the collecting surface of the filter through the communication hole. Vibration is applied to the filter together with the pressure to drop the fume on the collecting surface. The dropped fume is taken out of the device from the dust box.

In the second invention, when the filter has a cylindrical shape and its internal space is divided into a plurality of spaces, the nozzles corresponding to each space eject the shield gas sequentially at different times or at different timings. Since each of the above spaces is partitioned and is a small space, the flow rate of the jet shielding gas required for cleaning the fume is small.

The filter cleaning can be performed by jetting the filter pulse even if the blower is operating, as long as the jet pulse can be countered.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a cylinder for shielding gas, which contains, for example, high-pressure carbon dioxide gas or the like. Reference numeral 2 denotes a power supply device for supplying a large current for welding, and reference numeral 3 denotes a fume recovery device mounted on a truck. A wire feeder 4 for automatically supplying a welding wire according to the use of the welding wire in the torch 5 is mounted on the fume recovery device 3.

A suction hood 6 for sucking welding fume is attached to the tip of the torch 5, and a suction hose 7 for sucking fume is attached to the suction hood 6.
Is connected.

The cylinder 1 is connected by a hose 9 via a pressure regulating valve 8 to a distribution valve 10 provided in the fume recovery device 3. One end of the distribution valve 10 is connected to the torch 5 by a hose 11. To supply shielding gas.

The power supply 2 is connected to cables 12 and 13.
It is connected between the torch 5 and the location to be welded.

The fume collecting device 3 on the cart is shown in FIG.
As shown in FIG. 1, the housing is formed as a single box, and the inside thereof is partitioned into a plurality of chambers by partition walls. A connection hole 16 for connecting the suction hose 7 is provided on the outer wall of the first chamber 15, and a filter 17 is exchangeably housed inside the connection hole 16. A drawer-shaped dust box 18 is provided below the filter 17.

The filter 17 has a tubular shape extending in the lateral direction, and has one end (the left end in FIG. 2) closed and the other end opened. In addition, the filter 17 has a preferable mode.
The internal space is partitioned into three spaces by partitioning plates 19 (19A and 19B) provided in parallel with the longitudinal direction.

As a preferred embodiment, a flow-increasing tube 22 having a throat portion and having a venturi shape faces the partitioning space of the filter 17 on a partitioning wall 21 separating the second chamber 20 and the first chamber 15. Partition wall 21
Is formed with a communication hole. On the side of the second chamber 20,
A blower 2 is installed in a room further partitioned by a partition wall having a window 23.
4 in the second chamber 20,
The air in the suction space formed behind is sucked through the window 23.

Behind the second chamber 20 is a partition wall 2
5, a tank housing chamber 26 is formed, and a tank 27 of a shielding gas is housed in the tank housing chamber 26. The tank 27 is connected to a connection port 29 provided on the outer wall by a pipe 28, and is filled with a shielding gas through another outlet of the distribution valve 10 in FIG. The partition wall 25 is provided with small-diameter nozzles 30 corresponding to the axial positions of the flow-increasing pipes 22, respectively.
1 and connected to the tank 27. The control valve 31 ejects the shield gas in a pulsed manner from the nozzle 30 for a predetermined period at a different time or a different timing by a control unit housed in a side chamber 32 provided on the side of the first chamber 15. It has become.

The operation of this embodiment will be described below. [I] At the time of fume recovery At the time of welding work, all the control valves 31 are closed, and only the blower 24 is operating. FIG. 3 is a schematic structural view of the apparatus of FIG. 2 as viewed from above, and as can be seen from FIG. When the air is exhausted outside the apparatus, the air in the filter 17 flows into the second chamber 20 through the flow increasing pipe 22. Therefore, the air that carries the fume from the connection port 16 to the first chamber 15 via the suction cover 6 and the suction hose 7 flows through the filter 17 leaving the fume on the outer surface of the filter 17. Thus, fumes are collected by the filter 17. In the present embodiment, the air in the first chamber is caused to flow into the second chamber by using the flow increasing pipe 22. It may be made to be sucked. [II] Filter Cleaning When the welding operation is repeatedly performed and the fumes collected in the filter 17 exceed the allowable amount and accumulate, the filter must be cleaned. Usually, this cleaning is performed when welding is not being performed, that is, when the blower is stopped.

As shown in FIG. 4, the three control valves 31 are repeatedly opened at different timings or at different timings within a predetermined period, and are opened only momentarily.
The inner shield gas is jetted from each nozzle 30 in a pulsed manner. For example, after the first nozzle 30 emits a gas jet of a plurality of pulses, the second nozzle, the third nozzle emits a gas jet at a different time, or three nozzles 30 emit a gas jet of one pulse. Gas jets may be emitted at timings that do not overlap each other between the next pulse.

The gas jet ejected from the nozzle 30 flows through the flow increasing pipe 22 and flows into each space of the filter 17 as shown in FIG. At this time, since the flow increasing pipe 22 has a Venturi tubular shape, the air around the gas jet is also drawn in to increase the flow and enter the filter 17. The increased pulsed cleaning gas flow is supplied to the filter 17.
Flows out through the filter 17 while applying an impact force to the filter. As a result, the fumes are separated from the filter 17 by the cleaning gas flow passing through the filter 17 and further by the vibration of the filter caused by the impact force, and fall off. The dropped fumes are collected in the dust box 18 and taken out of the apparatus as appropriate.

[0024]

As described above, according to the present invention, a part of the shielding gas used for welding is filled in the tank and this is ejected in the form of a pulse toward the filter. A compressed air source and a piping for the compressed air source are not required, and the apparatus can be used in any place where gas shield welding is performed, and the effect that the apparatus can be easily drawn can be obtained. In addition, for example , shielding gas such as CO ₂ , _Ar and a mixed gas thereof is ejected in a pulsed manner. Since this shielding gas is heavier than air, its inertia is much larger than when only air is used. Its usage is extremely low. For example, the amount used for welding can be about 1/100 or less. Furthermore, if the internal space of the filter is divided into a plurality of parts and the above-mentioned pulse-like shield gas is ejected at different times or timings by nozzles corresponding to each space, the shield gas flow rate per unit time is as large as possible. can Fig Rukoto the size of the reduction can device.

[Brief description of the drawings]

FIG. 1 is an overall schematic view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a partially broken enlarged perspective view of the fume collecting device of the device of FIG.

FIG. 3 is a schematic configuration diagram of the fume collection device shown in FIG. 2 as viewed from above, and shows a state of fume collection.

FIG. 4 is a schematic configuration view of the fume collection device of FIG. 2 as viewed from above, and shows a state in which a filter is being cleaned.

[Explanation of symbols]

 Reference Signs List 3 fume recovery device 4 welding wire supply device 5 torch 6 suction hood 7 suction hose 15 first chamber 17 filter 20 second chamber 21 partition wall 22 communication hole (increase pipe) 24 blower 27 tank 30 nozzle

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Susumu Imaoka 100-1, Urakawachi, Miyama-ji, Fujisawa-shi, Kanagawa Prefecture Inside the Kobe Steel Fujisawa Works (72) Inventor Yu Saeki 7-chome Hiyoshi, Kohoku-ku, Yokohama, Kanagawa Prefecture No. 15-22 Nippon Seimitsu Co., Ltd. (56) References JP-A-5-192524 (JP, A) (58) Field investigated (Int. Cl. ⁶ , DB name) B23K 9/32 B01D 46/00

Claims (7)

(57) [Claims] 1. A welding fume dust deposited on one surface of a filter is welded in a direction opposite to an air flow of the filter filtration.
A nozzle for ejecting a shielding gas for use in a pulse jet shape to the other surface of the filter. 2. A method in which a suction hood for collecting fume scattered at a welding point is attached to a torch, and the fume is collected by a fume collection device via a suction hose connected to the suction hood. The fume recovery device includes a suction unit and a jet unit, and the suction unit includes a first chamber and a second chamber separated by a partition wall having a communication hole,
A filter is exchangeably disposed in the first chamber so as to form a space covering the communication hole, and the suction hose is connected to a space on the opposite side of the communication hole with respect to the filter, The two chambers are formed as a suction space sucked by a blower, and the ejection section is provided with a tank filled with gas heavier than air, and the communication hole is pulsated with gas heavier than air in the tank at a predetermined time. A welding fume collecting device, wherein a nozzle for jetting inward is provided facing the second chamber. 3. A venturi-shaped flow-increasing tube having a throat portion having an inner diameter larger than the diameter of the nozzle opening of the nozzle is disposed in the second chamber in a line connecting the nozzle and the communication hole. The welding fume collecting device according to claim 2. 4. The filter is formed in a cylindrical shape so as to cover the communication hole, and its internal space is partitioned into a plurality of spaces opened to the communication hole side, and each of the spaces in which the nozzle and the communication hole are partitioned. 3. The welding fume collecting device according to claim 2, wherein the welding fume collecting device is provided for each of the welding fumes. 5. A flow increasing pipe according to claim 3 , wherein a throat portion having an inner diameter larger than the diameter of the nozzle outlet is disposed between each nozzle and the corresponding communication hole. Weld fume recovery device. 6. The welding fume collecting device according to claim 2, further comprising a welding wire feeding device. 7. A welding fume collecting device according to claim 6, that is mounted detachably to the carriage.