JP2007307578A - Method and apparatus for recovering weld fume - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of recovering weld fume, which can stably recover weld fume over the long term while simplifying a structure and reducing the necessity in the maintenance of an apparatus. <P>SOLUTION: A gas containing weld fume generated in a weld part 1 is jet in a catching liquid 6 in a catchment tank 4 to catch the weld fume by the catching liquid 6. The catching liquid 6 in the catching tank 4 is led out to the recovery tank 14 to circulate the catching liquid 6 between the catching tank 4 and a recovery tank 14. The weld fume in the catching liquid 6 is magnetically adsorbed by a rotary driving magnet 22 provided in the recovery tank 14, and the weld fume magnetically adsorbed is peeled off from the magnet 22 to be recovered. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a welding fume recovery method and apparatus for recovering welding fume generated by a laser welding machine or the like.

  As a conventional welding fume recovery device, there are a recovery device using a filter, an electrostatic dust collection recovery device, a wet recovery device using a liquid, and a recovery device that combines the above means.

  In the collection device with a filter, welding fume accumulates in a short time on the surface of the collecting filter, and the suction ability of the gas containing the welding fume from the welded portion by the blower decreases, so stable collection for a long time However, there are problems such as an increase in the size of filters and blowers for collection and an increase in noise. In addition, maintenance such as cleaning and replacement of the collection filter is necessary, and the work is troublesome.

  In addition, the electrostatic precipitator is provided with a discharge electrode and a dust collecting electrode facing each other, and the welding fume is charged by the action of an electric field between them and attached to the dust collecting electrode. It is necessary to remove the adhering welding fumes as in the case of the apparatus, and the work is troublesome.

  In addition, the welding fume generated during the welding operation is dusty and has a small particle size, and since oxygen is contained in the gas containing the welding fume sucked from the welded portion, measures to prevent ignition are necessary. Wet recovery devices using liquids have been developed as means for improving the problems of these filter-based recovery devices, electrostatic dust collection and recovery devices, and the following are known as typical ones. ing.

  A predetermined amount of processing liquid is put into a cylindrical welding fume processing tank, and pressure gas is supplied from the bottom of the processing tank to raise the processing liquid level by making the processing liquid into an oscillating foam shape. Welding fume is supplied from the outside, and the oscillating foam-like treatment liquid is allowed to pass therethrough, and the purified gas is discharged from the upper portion of the treatment tank. (For example, refer to Patent Document 1).

  In addition, the upstream end of the conduit having an inclined pipe portion that becomes lower as it is separated from the laser welder is connected to the laser welder, and the treatment liquid is stored in a treatment tank in which gas from the conduit is hidden and stored. A plurality of nozzles for ejecting the treatment liquid toward the gas flow flowing upward from the liquid surface of the liquid, the circulation pump for supplying the treatment liquid sucked from the bottom of the treatment tank to the sprayer and the nozzle, and A filter is provided between the sprayer and the nozzle and between the treatment tank and a magnet is attached to the bottom of the treatment tank so as to sink into the treatment liquid.

As a result, the welding fume removed from the gas by contact with the processing liquid in the processing tank and granulated in the processing liquid, and the welding fume contained in the processing liquid flowing from the conduit side are It is removed by a filter during the circulation of the treatment liquid. In addition, the welding fumes in the processing liquid will be adsorbed by the magnet, and it is intended to prevent the granular welding fumes from dispersing and floating in the processing liquid as much as possible and to increase the capture efficiency of the welding fumes ( For example, see Patent Document 2).
JP-A-6-292970 JP 2000-158175 A

  However, in the above-described Patent Document 1, a foamed bubble-like layer is formed on the upper surface of the processing liquid by supplying a pressure gas. It is difficult to always stably form and the welding fume cannot be reliably captured and recovered. In addition, there is a problem that a facility for supplying a pressure gas is required, the size is increased, and noise is increased.

  Moreover, in the thing of above-mentioned patent document 2, although the welding fume contained in a process liquid is removed with a filter in the circulation path | route of the process liquid in a circulation pump, it is a filter like the above-mentioned dry-type collection | recovery apparatus. Because welding fume accumulates on the surface in a short time and the circulating amount of the processing liquid by the circulation pump decreases, it is difficult to perform stable recovery for a long period of time, and maintenance such as cleaning and replacement of the filter is necessary. It takes time and effort.

  In addition, a flat plate magnet is installed at the bottom of the treatment tank, and a part of the welding fume in the treatment liquid is adhered to it, but the adhered welding fume is peeled off at the bottom of the treatment tank or the magnet is put in and out. Work is necessary and labor is required.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and simplifies the configuration and reduces the need for maintenance of the apparatus, and also recovers a welding fume and recovers the welding fume over a long period of time. Is intended to provide.

  In order to achieve the above-mentioned object, the present invention allows a gas containing welding fume generated in a welded portion to be ejected into a collecting liquid in a collecting tank to collect welding fumes with the collecting liquid, and The collection liquid is led to the collection tank, and the collection liquid is circulated between the collection tank and the collection tank, and the welding fume in the collection liquid is magnetically adsorbed to the rotationally driven magnet provided in the collection tank, The magnetically attracted welding fume is peeled off from the magnet and collected.

  ADVANTAGE OF THE INVENTION According to this invention, while simplifying an apparatus and reducing the necessity of maintenance, it can be set as the welding fume collection | recovery method and collection | recovery apparatus which enabled it to collect | recover welding fume stably over a long period of time.

  1st invention makes the gas containing the welding fume which generate | occur | produced in the welding part spout in the collection liquid of a collection tank, collects welding fume with the said collection liquid, and collects the collection liquid of the said collection tank. The collected liquid is circulated between the collection tank and the collection tank by being led to the collection tank, and the rotating fume magnet provided in the collection tank is caused to magnetically adsorb the welding fume in the collected liquid, and the magnetic adsorption is performed. The welding fume recovery method is characterized in that the welding fume is peeled off from the magnet and recovered.

  As a result, it is possible to provide a welding fume recovery method in which the need for simplification and maintenance of the apparatus can be reduced and the welding fume can be recovered safely and stably over a long period of time.

  According to a second aspect of the present invention, there is provided a welding fume recovery method according to the first aspect, wherein the temperature of the collected liquid can be adjusted.

  As a result, the temperature rise of the collected liquid due to the gas containing the welding fume can be suppressed, the safety against ignitability can be further improved, and freezing in the winter can be prevented to stably collect the welding fume. it can.

  According to a third aspect of the present invention, there is provided a discharge pipe for conveying a gas containing welding fume generated in a welded portion by a blower, and a collection tank storing a collection liquid for collecting welding fume from the gas introduced through the discharge pipe. A collection tank for storing the collected liquid led out from the collection tank, a circulating means for circulating the collected liquid between the collection tank and the collection tank, and welding in the collected liquid of the collection tank A welding fume collecting apparatus comprising a rotating body having a magnet for magnetically adsorbing fume and a scraper for peeling off the welding fume magnetically adsorbed to the magnet.

  As a result, it is possible to provide a welding fume recovery apparatus that can simplify the apparatus and reduce the need for maintenance, and can recover the welding fume stably over a long period of time.

  According to a fourth aspect of the present invention, there is provided a welding fume recovery apparatus according to the third aspect of the present invention, which is provided with a temperature adjusting means for the collected liquid.

  As a result, the temperature rise of the collected liquid due to the gas containing the welding fume can be suppressed, the safety against ignitability can be further improved, and freezing in the winter can be prevented to stably collect the welding fume. it can.

  A welding fume recovery device according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a welding fume recovery device according to an embodiment of the present invention, and FIG. 2 is a perspective view of a magnetic adsorption portion of the welding fume.

  The welding part 1 is equipped with a welding mechanism for parts by laser and a case (not shown) for preventing scattering of the welding fume generated here (not shown). The welding fume is sucked together with nitrogen gas and air gas, for example. Suction is performed by the blower 3 through the tube 2. The other end of the suction pipe 2 is connected to a diffuser pipe 4 having a plurality of diffuser holes 4a. The gas containing the welding fume sucked by the blower 3 is ejected from the diffuser hole 4a.

  A collection liquid 6 such as a certain amount of tap water is stored in the collection tank 5, and the diffuser pipe 4 is located at the bottom of the collection tank 5, and a gas containing welding fume is made into a plurality of diffuser holes 4a. The welding fume is captured and collected by the collection liquid 6 in the process of being ejected from the liquid to the collection liquid 6 and rising in the collection liquid 6. The gas that has passed through the collection liquid 6 is discharged from the exhaust pipe 7 to the outside of the collection tank 5. Moreover, the collection liquid 6 is supplied to the collection tank 5 through a supply pipe 8 and an on-off valve 9 as necessary.

  In addition, a discharge pipe 10 is connected to the bottom of the collection tank 5 so that the collection liquid 6 can be discharged by an on-off valve 11 during maintenance. Further, the collection tank 5 is provided with a water level detector 12 for the collected liquid 6 and a temperature detector 13 for the collected liquid 6, and the water level detector 12 controls the on-off valve 9 to control the water level of the collected liquid 6. Adjust to a certain range. Further, the temperature detector 13 controls temperature adjusting means, which will be described later, to adjust the collected liquid 6 to a certain temperature range.

  A collection tank 14 is provided along with the collection tank 5, and the collected liquid 6 in the collection tank 5 is led out to the collection tank 14 by a circulation pump 16 that is a circulation means from the outlet pipe 15 and is stored in a certain amount. The collected liquid 6 stored in the collection tank 14 is returned to the collection tank 5 through the return pipe 17. The return pipe 17 located in the collection tank 5 has a plurality of ejection holes 17 a, and the collection liquid 6 stored in the collection tank 14 from the ejection holes 17 a is in the collection liquid 6 of the collection tank 5. Erupt downward.

  The collection liquid 6 is circulated between the collection tank 5 and the collection tank 14 by a circulation pump 16 that is a circulation means via the lead-out pipe 15 and the return pipe 17, and the collection liquid 6 is collected in the collection tank 5. A circulation flow from the upper side to the lower side is formed, and a circulation flow from the lower side to the upper side is formed in the recovery tank 14.

  A heat exchanger 18 is positioned in the middle of the return pipe 17, and the heat exchanger 18 has a heat radiating fin 18a. The fan 18b is driven by the detected value of the temperature detector 13, and is captured by this air blow. Cool the collected liquid 6. In addition, an electric heater 19 is provided in the middle of the return pipe 17 and energized by the detection value of the temperature detector 13 to heat the collected liquid 6. The heat exchanger 18 and the electric heater 19 constitute a temperature adjusting means for the collected liquid 6. The circulation pump 16, the heat exchanger 18, and the electric heater 19 may be provided in any of the outlet pipe 15 and the return pipe 17.

  In addition, a discharge pipe 20 is connected to the bottom of the recovery tank 14 so that the collection liquid 6 can be discharged by an on-off valve 21 during maintenance.

  A magnet 22 for magnetically adsorbing welding fumes is provided on the circumferential surface of the upper part of the recovery tank 14, and a rotating body 23 that rotates around a horizontal axis is located. A substantially half circumference of the rotating body 23 is in the collection liquid 6. It is fixed in a state immersed in Further, as shown in FIG. 2, a motor 25, which is a rotation driving means, is connected to the rotating shaft 24 of the rotating body 23 to rotate the rotating body 23 at a predetermined speed.

  The welding fume in the collection liquid 6 is magnetically attracted and collected on the surface of the magnet 22 on the circumferential surface of the rotating body 23 whose lower part is immersed in the collection liquid 6. Further, a scraper 26 is provided in contact with the magnet 22 on the circumferential surface of the rotating body 23, the welding fume magnetically attracted to the magnet 22 is stripped by the scraper 26, and the stripped welding fume is collected in the container 27. . The scraper 26 is located above the liquid level of the collected liquid 6.

  In FIG. 1, the solid line arrow indicates the flow direction of the collected liquid 6, the broken line arrow indicates the gas flow direction, and the alternate long and short dash line arrow indicates the rotation direction of the rotating body 23.

  Next, main operation operations and effects in the welding fume recovery apparatus having the above-described configuration will be described. The welding fume generated in the welded portion 1 is sucked by the blower 3 through the suction pipe 2 together with, for example, nitrogen gas and air gas, and the gas containing this welding fume is formed in the diffuser pipe 4 at the other end of the suction pipe 2. The plurality of diffused holes 4a are ejected into the collection liquid 6 in the collection tank 5. The gas containing the welding fume is divided by the diffuser holes 4a and rises upward from below the collected liquid 6 by buoyancy. The welding fume is captured and collected in the collecting liquid 6 in the process of rising in the collecting liquid 6, and the gas that has passed through the collecting liquid 6 is discharged from the exhaust pipe 7 to the outside of the collecting tank 5.

  The gas containing the welding fume is divided by the diffuser holes 4 a and rises upward from below the collection liquid 6 by buoyancy, while the collection liquid 6 is collected from the plurality of ejection holes 17 a formed in the return pipe 17 in the collection tank 5. A circulating flow is formed by ejecting the collected liquid 6 downward from above. Therefore, the flow of the gas containing welding fume and the flow of the collection liquid 6 in the collection tank 5 are counterflows. As a result, the contact between the gas and the collection liquid 6 and the stirring action are promoted, so that the welding fume in the gas is easily caught by the collection liquid 6 and the collection efficiency can be improved.

  As described above, the collection liquid 6 is circulated between the collection tank 5 and the collection tank 14 and collected on the surface of the magnet 22 on the circumferential surface of the rotating body 23 immersed in the collection liquid 6 of the collection tank 14. The welding fumes in the liquid collection 6 are collected by magnetic adsorption.

  Further, the suction side of the return pipe 17 is positioned in the vicinity of the magnet 22 having the circumferential surface of the rotator 23 and the collection tank 14 forms a circulating flow of the collected liquid 6 from the lower side to the upper side in the collection tank 14. The liquid collection 6 flows along the magnet 22, and the contact of the welding fume to the surface of the magnet 22 can be promoted to efficiently magnetically attract.

  A scraper 26 is provided in contact with the magnet 22 on the circumferential surface of the rotating body 23, the welding fume magnetically attracted to the magnet 22 is peeled off by the scraper 26, and the removed welding fume is collected in the container 27. However, the configuration of the scraper 26 is not limited to the embodiment, as long as the welding fume can be peeled off (scraped) from the surface of the magnet 22.

  Furthermore, by separating the collection tank 5 and the collection tank 14, it is possible to simplify the configuration and the overall configuration of the collection tank 5 and the collection tank 14. Further, since the filter is not used, it is not necessary to clean or replace the filter, and the rotating body 23 having the magnet 22 for magnetically adsorbing the welding fume is provided at the upper portion of the recovery tank 14 so as to be positioned. Therefore, the maintenance can be simplified and the work can be greatly reduced, and the welding fume can be recovered stably for a long time.

  In addition, by constantly circulating the collection liquid 6 between the collection tank 5 and the collection tank 14 and in each of the collection tank 5 and the collection tank 14, the welding fume is fluidized, and sedimentation and stagnation at some parts are prevented. It is possible to prevent the welding fume from being effectively magnetically attracted to the surface of the magnet 22 and recovered.

  Further, the temperature of the welding fume and gas sucked from the welded portion 1 tends to increase, and the temperature of the collection liquid 6 that comes into contact with the gas containing the welding fume also rises. Especially in the summer, the temperature of the collected liquid 6 tends to be higher. As described above, in this embodiment, the heat exchanger 18 is positioned in the middle of the return pipe 17, the fan 18 b is driven by the detection value of the temperature detector 13, and the collected liquid 6 circulated by this ventilation is, for example, 30 Cool to below ℃. Thereby, the temperature of the collection liquid 6 in the collection tank 5 and the collection tank 14 can be lowered to prevent the magnetizing ability of the magnet 22 from being lowered, and the durability of the circulation pump 16 can be maintained. Furthermore, the ignition factor of welding fume can be removed, and safety can be further improved.

  Moreover, when the state which stopped the collection | recovery operation | movement of the welding fume was continued in winter, there exists a possibility that the collection liquid 6 of the collection tank 5 and the collection tank 14 may freeze, and it will become difficult to start collection | recovery operation. As described above, in the present embodiment, the electric heater 19 is provided in the middle of the return pipe 17, and the collected liquid 6 circulated by energization according to the detection value of the temperature detector 13 is heated. As a result, freezing of the collected liquid 6 can be prevented, damage to the apparatus can be prevented, and recovery operation can be stabilized. Under temperature conditions, freezing can also be prevented by driving the circulation pump 16 without energizing the electric heater 19 and circulating the collected liquid 6.

  In the above-described embodiment, the electric heater 19 is used as the heating source of the temperature adjusting means. However, the present invention is not limited to this. For example, a combustion device for oil or gas fuel, a solar heat collector, a reaction between quick lime and water. It may be due to heat or the like. Further, a heat pump cycle may be used as a cooling and heating means.

  In this welding fume recovery device, the shape and volume of the collection tank 5 and the collection tank 14, the amount of the collection liquid 6, the surface area of the magnet 22, the rotational speed of the rotating body 23 having the magnet 22 on the circumferential surface thereof. There are element systems and parameters such as the suction amount of the gas containing welding fume and the circulation amount of the collected liquid 6 between the collection tank 5 and the collection tank 14, but these are the generation amounts of the welding fume (recovery load). Depending on the size and size, it can be arbitrarily selected and set to the optimum condition.

  As described above, according to the present invention, it is possible to provide a welding fume recovery method and a recovery device that can simplify the apparatus and reduce the need for maintenance, and can recover the welding fume stably over a long period of time. .

  It can be widely applied as a welding fume recovery device.

The block diagram which shows the collection method and collection | recovery apparatus of the welding fume of one Example of this invention. The perspective view of the magnetic adsorption | suction part of the welding fume in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Welding part 2 Suction pipe 3 Blower 4 Air diffuser pipe 4a Air diffuser hole 5 Collection tank 6 Collected liquid 7 Exhaust pipe 8 Supply pipe 9 Open / close valve 10 Drain pipe 11 Open / close valve 12 Water level detector 13 Temperature detector 14 Recovery tank 15 Derivation Pipe 16 Circulation pump (circulation means)
17 Return pipe 18 Heat exchanger (temperature control means)
18a Heat radiation fin 18b Fan 19 Electric heater (temperature control means)
20 Discharge Pipe 21 Open / Close Valve 22 Magnet 23 Rotating Body 24 Rotating Shaft 25 Motor 26 Scraper 27 Container

Claims (4)

  A gas containing welding fumes generated in the welded part is ejected into the collecting liquid of the collecting tank, and the welding fumes are collected by the collecting liquid, and the collecting liquid of the collecting tank is led to the collecting tank. The collection liquid is circulated between the collection tank and the collection tank, and the welding fume in the collection liquid is magnetically adsorbed to the rotationally driven magnet provided in the collection tank, and the magnetically adsorbed welding fume is peeled off from the magnet. A method for collecting welding fume, wherein the method collects and collects the welding fume.   The method for recovering welding fume according to claim 1, wherein the temperature of the collected liquid can be adjusted.   A lead-out pipe for conveying a gas containing welding fumes generated in a welded portion by a blower, a collecting tank for storing a collecting liquid for collecting welding fumes from the gas introduced through the lead-out pipe, and the collecting tank A collection tank for storing the collected liquid derived from the liquid, circulation means for circulating the collected liquid between the collection tank and the collection tank, and a magnet for magnetically adsorbing the welding fume in the collected liquid in the collection tank And a scraper for stripping off the welding fume magnetically attracted to the magnet.   The welding fume recovery device according to claim 3, further comprising a collecting liquid temperature adjusting means.

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