JP2000157822A - Wet dust collector for collection of welding hume - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a collecting efficiency for welding fume while the welding fume is prevented from being dispersed and floated in treating liquid by installing a magnet in a treating tank so that it is sinked into the treating liquid in that wherein a conductor linked to a laser welder is connected to the treating tank in which the treating liquid is reserved. SOLUTION: A dust collector 2 to be connected to a laser welder comprises dust collecting parts 3 to 5, and a support box 8 is fixed to an upper part inside a treating tank 6 to be provided to the dust collecting part 4 among them. A turbo fan 9 is fixed to a central part of an upper surface of the support box 8, a mechanical filter 10 is fitted inside the support box 8, and a purifying room 11 is formed between the support box 8 and the mechanical filter 10. Then, a magnet 26 is freely detachably installed to a bottom part in such the treating tank 6 by sinking the magnet 26 into the treating liquid. Comparatively large particles among the iron series welding fume are attracted and collected in the treating liquid by the magnet 26, and collecting efficiency for the welding fume by the dust collector 2 is raised.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a welding fume trap in which a processing tank for storing a processing liquid is connected to a conduit connected to a laser welding machine for generating a gas in the processing liquid. The present invention relates to a wet dust collector for collection.

[0002]

2. Description of the Related Art Conventionally, such a wet dust collector has been already known, for example, from Japanese Patent Application Laid-Open No. 6-292970.

[0003]

In the above-mentioned conventional wet type dust collector, compressed air is blown from below into the processing liquid stored in the processing tank, and gas containing welding fume is sunk into the foaming processing liquid. , To improve the efficiency of collecting welding fumes. However, the fume that settled in the processing liquid descends along the inclined net plate provided in the lower part of the processing tank and accumulates in the tank, but compressed air from below passes through the inclined net plate. As it flows upwards, sedimentation of the welded fumes that have become granular will be hindered, and the welding fumes will be dispersed and the welding fumes will be collected by the suspended treatment liquid, so that the collection efficiency will increase. Hard to say.

[0004] The present invention has been made in view of such circumstances, and a welding fume in which granular welding fumes are prevented from dispersing and floating in a processing solution to enhance the collection efficiency of welding fumes. An object of the present invention is to provide a wet dust collector for collection.

[0005]

In order to achieve the above object, the present invention provides a processing tank for storing a processing solution, wherein a conduit connected to a laser welding machine for generating a gas containing iron-based welding fume is provided. In a wet fume collector for collecting fumes, which is connected so that the gas is immersed in the processing liquid, a magnet is attached to the processing tank so as to sink in the processing liquid.

According to such a configuration, the gas containing the iron-based welding fume generated by the laser welding machine dives into the processing liquid in the processing tank, so that the welding fume is captured in the processing liquid. However, since the magnet is attached to the treatment tank so that it sinks in the treatment liquid, the welding fume in the treatment liquid is adsorbed by the magnet, and the dispersion and floating of the granular welding fume in the treatment liquid is prevented. It can be prevented as much as possible, and the trapping efficiency of welding fumes in the wet dust collector can be increased.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

1 to 10 show an embodiment of the present invention. FIG. 1 is an overall side view of a laser welding machine and a wet dust collector, FIG. 2 is a schematic vertical sectional view of a main part of the wet dust collector, and FIG. FIG. 4 is an enlarged longitudinal sectional view showing a part of the first dust collecting portion, FIG. 4 is an enlarged longitudinal sectional view of the sprayer, FIG. 5 is a diagram showing a configuration of a control system, and FIG.
Is a flowchart showing a processing procedure in the welding machine control unit, FIG. 7 is a flowchart showing an abnormality processing procedure in the welding machine control unit, FIG. 8 is a flowchart showing a processing procedure in the dust collector control unit, and FIG. And FIG. 10 is a flowchart showing a stop processing procedure in the dust collector control unit.

First, in FIG. 1, a laser welding machine 1 includes:
A wet dust collector 2 for collecting welding fume generated by the laser welding machine 1 is connected to the wet dust collector 2.
Is composed of first, second and third dust collecting sections 3, 4, and 5.

In the laser welding machine 1, laser welding is performed in a nitrogen gas atmosphere. Nitrogen gas containing welding fumes generated by the laser welding machine 1 is discharged to the outside through a wet dust collector 2. First of wet dust collector 2
To the third dust collecting sections 3, 4, and 5, respectively, perform wet dust collecting processing.

In FIG. 2, the second dust collecting section 4 has a processing tank 6, which is formed, for example, in a cylindrical shape with both ends closed, and stands on a floor 7 (see FIG. 1). Is established.
A support box 8 having an open bottom is fixed to an upper portion in the processing tank 6, and a turbo fan 9 is provided at the center of the upper surface of the support box 8.
Is fixed. A tapered mechanical filter 10 having a smaller diameter as it goes downward is mounted in the support box 8, and the mesh diameter of the mechanical filter 10 is set to, for example, 1.0 μm. Support box 8
A purification chamber 11 is formed between the mechanical filter 10 and the upper surface of the mechanical filter 10. The purification chamber 11 communicates with the suction port of the turbofan 9.

In the purification chamber 11, a water injection nozzle 12 for injecting water toward the suction port of the turbofan 9 is fixedly arranged. A water supply pipe 13, which is connected to a water supply source (not shown) and extends to the outside of the treatment tank 6 in connection with the water injection nozzle 12, is provided with a water supply valve 14 which is manually opened by a worker, or a worker. A water supply valve, which is an electromagnetic valve that is not operated manually, is provided. When the water supply valve 14 is opened, water is injected from the water injection nozzle 12 toward the turbo fan 9.

A gas introduction box 15 into which gas from the first dust collecting section 3 is introduced is fixed at the center of the lower part of the support box 8, and a tapered guide member 16 having a smaller diameter as it goes upward is provided with a gas. It is fixedly arranged in the processing tank 6 so as to be located below the lower end opening of the introduction box 15. On the other hand, a processing liquid is stored in a lower portion of the processing tank 6, and an unpurified chamber 17 facing the lower surface of the mechanical filter 10 is provided around the gas introduction box 15 above the liquid level of the processing liquid. It is formed.

One end of a suction pipe 18 is connected to the bottom of the processing tank 6, and the other end of the suction pipe 18 is connected to a suction port of a circulation pump 19. Further, the discharge port of the circulation pump 19 is connected to one end of a discharge pipe 21 via a pair of filters 20, 20, and the other end of the discharge pipe 21 protrudes into the processing bath 6. Thus, the pair of filters 20 and 20 normally use only one filter 20 and one filter 20 normally.
Are connected in parallel so that the other filter 20 is used during maintenance of the two filters 20 and 2.
One end of 0 is connected to a circulation pump 19 via a switching valve 22, and the other ends of both filters 20, 20 are connected to one end of a discharge pipe 21 via a switching valve 23.

In the processing tank 6, a ring-shaped distribution pipe 24 surrounding the gas introduction box 15 is disposed in the unpurified chamber 17, and the other end of the discharge pipe 21 is connected to the distribution pipe 24. Is done. In addition, nozzles 25, 25, which jet the processing liquid toward the gas flowing upward from the surface of the processing liquid after dipping the processing liquid, are provided at a plurality of locations spaced in the circumferential direction of the distribution pipe 24. Can be mounted with the ejection direction facing outward. These nozzles 25 are set so that the minimum mist diameter of the processing liquid to be jetted is equal to or smaller than the mesh diameter of the filter 20, for example, 1.0 μm, for example, 0.5 to 1.0 μm.

In the second dust collecting section 4, the gas containing the welding fume introduced into the gas introducing box 15 is spread downward by the guide member 16 from the lower end opening of the gas introducing box 15 so as to spread downward. After being guided, the gas flows so as to reverse upward toward the unpurified chamber 17, and when the gas flows from the gas introduction box 15 to the non-purified chamber 17, the gas containing the welding fume goes under the processing liquid, and is reversed. The processing liquid is ejected from the nozzles 25 toward the gas flowing upward. That is, dive the processing liquid,
By jetting the processing liquid from 5, 25 ..., the welding fume in the gas comes into contact with the processing liquid and is removed. The welding fume accompanying the gas without being removed even by the contact with the processing liquid is removed by the mechanical filter 10, and the gas passing through the mechanical filter 10 is sucked into the turbofan 9 via the purification chamber 11.

[0017] The above-mentioned treatment liquid is obtained by mixing at least one of a surfactant and a coagulant into water. When a surfactant is contained, the fume easily adapts to water by the action of the surfactant. In addition, bubbling is effectively generated on the surface of the processing liquid, and the welding fume is more effectively collected by the bubbling and spraying of the processing liquid from the plurality of nozzles 25. .

Examples of the flocculant include polyacrylamide, sodium polyacrylate, polyvinylpyridine,
Vinyl imidaline polymer and guar gum can be used, and so-called nucleating agents such as zeolite, activated carbon, aluminum hydroxide, activated clay, kaolin clay and calcium carbonate, polyaluminum chloride, aluminum sulfate, sodium aluminate and polyaluminum chloride It is also possible to use a so-called fixing agent such as a coagulant.

When the coagulant is mixed with water, the function of the coagulant effectively increases the diameter of the welding fume to such an extent that the fume is effectively coagulated in the processing liquid and settles in the processing liquid. Therefore, the removal of the particulate welding fume by the filter 20 becomes effective.

At the bottom of the processing tank 6, a magnet 26 is detachably provided so as to sink into the processing solution.
The magnet 26 functions to adsorb and capture relatively large particles of, for example, several μm or more, of the iron-based welding fume in the processing liquid, thereby increasing the efficiency of capturing the welding fume in the wet dust collector 2.

Referring also to FIG. 3, the first dust collecting section 3
The second dust collecting section 4 includes a conduit 28 connecting the gas introduction box 15 of the processing tank 6 and the laser welding machine 1 in the processing unit 6, and a plurality of sprayers 29, 29.

The conduit 28 is formed by connecting a plurality of pipes with a flange. The conduit 28 is formed so as to become lower at least in a portion from an intermediate portion thereof toward the processing tank 6 at a portion closer to the processing tank 6. It is configured to be inclined. That is, the conduit 28 is connected to the laser welding machine 1 and rises upward and rises upward, and a U-shape is formed in a substantially U-shape that opens downward and has one end connected to the upper end of the riser 28a. A first inclined tube portion 28c having one end connected to the other end of the U-shaped tube portion 28b and extending toward the processing tank 6 and inclined so as to become lower as approaching the processing tank 6; One end is connected to the other end of the pipe portion 28c and extends to the processing tank 6 side, and is inclined at a larger inclination angle than the inclination angle of the first inclined pipe portion 28c so as to become lower as approaching the processing tank 6 side. A pipe portion 28d;
One end is connected to the other end of the second inclined tube portion 28d and extends horizontally, and the other end is provided with a horizontal tube portion 28e connected to the gas introduction box 15 in the processing tank 6.

A conduit 30 for guiding the treatment liquid is fixedly disposed in the first inclined pipe portion 28c of the conduit 28. One end of the conduit 30 is connected to a discharge port of the circulating pump 19 through the filter 20, 20 is connected to a branch pipe 31 branched from a discharge pipe 21 and is connected to an air conduit 32 provided with an electromagnetic on-off valve 33, and the air conduit 32 is connected to a compressed air source (not shown). . That is, the pipe 3
0, the operation of the circulation pump 19 and the solenoid on-off valve 33
With the opening of the valve, the processing liquid and the compressed air are introduced, and the processing liquid is sprayed together with the compressed air from the sprayers 29, 29... Attached at a plurality of locations spaced apart in the longitudinal direction of the pipeline 30. Will be. Moreover, the first inclined pipe section 2
8c is preferably made of, for example, a transparent pipe made of vinyl chloride so that the spray state from each of the sprayers 29, 29,.

In FIG. 4, connecting pipes 34 are screwed into a plurality of lower portions of the pipe 30 which are spaced apart in the longitudinal direction, and one end of a bent pipe 35 is fitted into each connecting pipe 34. Is fixed. These bent pipes 35 are bent in a substantially L-shape so that the other ends are disposed on the downstream side along the gas flowing direction 36 in the first inclined pipe portion 28c. One end of the support ring 37 is fitted and fixed to the other end.

The sprayers 29 are detachably attached to the support rings 37 so as to spray the processing liquid mixed with the compressed air toward the downstream side along the flow direction 36. It comprises a body 38 to be screwed, a support rod 39 attached to the body 38 so as to be adjustable in an axial advance / retreat position, and a movable body 40 supported by the support rod 39.

The inner surface of the other end of the support ring 37 has a female screw 4
1 is provided, and the container body 38 is coaxially connected to one end of the cylindrical portion 38 a having an external thread 42 screwed to the female screw 41 and coaxially protruded into the support ring 37. The bottomed cylindrical portion 38b is integrally provided with a flanged portion 38c extending radially outward from the other end of the cylindrical portion 38a so as to face the other end surface of the support ring 37. 38b has an outer diameter smaller than the outer diameter of the cylindrical portion 38a so as to form an annular chamber 43 communicating with the inner surface of the support ring 37 through the bent pipe 35 and the connecting pipe 34 into the pipe 30. Formed. Moreover, communication holes 44, 44,... Communicating with the annular chamber 43 are provided at a plurality of locations spaced apart in the circumferential direction of the bottomed cylindrical portion 38b.

The support rod 39 has a male screw portion 39a at one end in the axial direction.
Penetrates through the central portion of the closed end of the bottomed cylindrical portion 38b of the container body 38, and a nut 45 and a lock nut 46 are screwed into a protruding portion of the male screw portion 39a from the bottomed cylindrical portion 38b. The other end of the support rod 39 has an enlarged diameter head 39b.
The position of the enlarged head 39b with respect to the body 38 in the axial direction of the support rod 39 is the male screw portion 39a.
It can be adjusted by changing the screw positions of the nut 45 and the lock nut 46 to the nut.

The movable body 40 includes a cylindrical portion 40a inserted into the cylindrical portion 38a of the body 38 while allowing the other end of the support rod 39 to be axially displaceable relative thereto, and a flange 38c of the body 38. The movable body 40 is integrally provided with a flange portion 40b projecting from the outer end of the cylindrical portion 40a so as to face the outer end surface. A position in contact with the portion 39b;
The flange 40b can move in the axial direction between a position where the flange 40b contacts the flange 38c of the body 38.

In such a sprayer 29, the processing liquid mixed with the compressed air is supplied from the pipe 30 to the connecting pipe 34 and the bent pipe 3.
When the movable body 40 is supplied into the body 38 through the annular chamber 43 and the communication holes 44, 44,.
Moves axially outward until it comes into contact with the enlarged diameter head 39b of
The processing liquid is sprayed over the entire circumference from the gap formed between the vessel 38 and the movable body 40, and the spray amount determined by the gap formed between the vessel 38 and the movable body 40 is:
It can be adjusted by the screwing position of the nut 45 and the lock nut 46 to the male screw portion 39a of the support rod 39.

Moreover, each of the sprayers 29 is set so that the minimum mist diameter of the spray liquid is, for example, 1.0 μm or more.

According to the first dust collecting section 3, the gas containing the welding fume generated by the laser welding machine 1 is supplied to the conduit 28.
While passing through the inside and being sent to the processing tank 6, the plurality of sprayers 2
The processing liquid is sprayed from 9, 29..., And a part of the welding fume is removed from the gas before reaching the processing tank 6. As a result, the amount of welding fume in the gas introduced into the processing tank 6 can be reduced as compared with a wet dust collector including only the second dust collecting section 4, and the efficiency of capturing welding fume as a whole can be increased.

Moreover, each of the sprayers 29, 29,.
The processing liquid sprayed from the sprayers 29, 29... Is provided in the first inclined pipe portion 28c which is inclined so as to become lower toward the side. It flows along the inner surfaces of the section 28c, the second inclined pipe section 28d and the horizontal pipe section 28e to the processing tank 6 side, and does not flow to the laser welding machine 1. Also, the processing liquid sprayed from each of the sprayers 29, 29... Collides with the inner surface of the first inclined pipe section 28 c and scatters. The rising pipe section 28 a rising from the laser welding machine 1 has a substantially U-shape opened downward. Connected to the upstream end of the first inclined tube portion 28c which rises toward the upstream side via the U-shaped tube portion 28b, the droplets of the processing liquid generated in the first inclined tube portion 28c emit laser light. There is no intrusion into the welding machine 1 side.

Referring again to FIG. 2, the third dust collecting section 5 includes an exhaust pipe 48 having one end connected to the discharge port of the turbofan 9,
An exhaust processing box 49 for projecting the other end of the exhaust pipe 48,
A plurality of nozzles 50 for spraying water toward the other end of the exhaust pipe 48 in the exhaust processing box 49 are provided.

The exhaust processing box 49 is fixedly disposed on the side of the processing tank 6 in the second dust collecting section 4, and between the processing tank 6 and the exhaust processing box 49, processing liquid is stored in the processing tank 6. An overflow pipe 51 is provided to allow a part of the processing liquid to overflow into the exhaust processing box 49 as the amount of the processing liquid accumulates.

Each of the nozzles 50 is provided in a water conduit 52 connected to a pressurized water source (not shown).
The water conduit 52 is provided with an electromagnetic on-off valve 53. Moreover, the nozzles 50 are set so that the minimum mist diameter of the sprayed water is smaller than the minimum mist diameter of the nozzles 25 in the second dust collecting section 4, for example, 0.5 μm.

The exhaust processing box 49 includes the exhaust processing box 4.
A drain pipe 54 for discharging a part of the water to the outside according to the accumulation of a predetermined amount or more of water in the inside 9 is provided. Further, one or a plurality of exhaust ports 55, 55 are provided in the upper part of the exhaust processing box 49, and the exhaust ports 55, 55 are provided with a filter 56,
56 are filled.

According to the third dust collecting section 5, when the gas containing the welding fumes that cannot be removed by the second dust collecting section 4 is introduced into the exhaust treatment box 49, each of the nozzles 50, 50 is used. …
The residual welding fume is collected by the shower effect of the water, and the gas further purified by the filters 56, 56 is discharged to the outside through the exhaust ports 55, 55.

In FIG. 5, control panels 58 and 59 are provided near the laser welding machine 1 and the wet dust collector 2, respectively. The control panel 58 on the laser welding machine 1 side operates the laser welding machine 1. A starter switch 62, a stop switch 63, and a reset switch 64 for changing a switching mode by a manual operation of an operator are provided, and a signal from each of the switches 62, 63, 64 is provided. Welding machine control unit 6
1 is input.

The control panel 59 on the wet dust collector 2 side has a dust collector control unit 65 for controlling the operation of the wet dust collector 2.
The dust collector control unit 65 controls the opening and closing operations of the solenoid on-off valves 33 and 53, controls the inverter so that the circulating pump 19 rotates at a constant rotation speed, and further controls the turbo fan 9 at its rotation speed. It is possible to control the inverter with a variable number. The alarm 60 is connected to the dust collector control unit 65, and the alarm 60 is activated by an alarm signal from the dust collector control unit 65.

In the dust collector control unit 65, the detection value of the hydraulic pressure sensor 66 for detecting whether the hydraulic pressure between the circulation pump 19 and the switching valve 22 is out of a predetermined range, and the electromagnetic on-off valve 33 are opened. A detection value of a stroke sensor 67 for detecting a valve body stroke of the electromagnetic on-off valve 33 for detecting whether or not the valve element is provided for detecting whether or not the electromagnetic on-off valve 53 is opened. A detection value of a stroke sensor 68 for detecting a stroke, and a liquid level sensor 6 for detecting a liquid level in the processing tank 6 in the second dust collecting section 4.
9 for detecting the temperature of the gas in the exhaust pipe 48 for guiding the gas from the turbofan 9 and the flow rate of the gas sucked from the laser welding machine 1 to the wet dust collector 2. For example, a value detected by a flow velocity sensor 71 attached to a portion of the conduit 28 near the gas introduction box 15 of the second dust collecting section 4 is input.

Each of the sensors 66 to 71 is a wet dust collector 2
The dust collector control unit 65 functions as an abnormality detector for detecting abnormality of the
An abnormality is determined based on the detection values of ~ 71.

That is, the hydraulic pressure sensor 66 detects the hydraulic pressure of the processing liquid between the circulating pump 19 and the two filters 20, 20, but the hydraulic pressure decreases due to an abnormality in the inverter of the circulating pump 19 or the like. When it is too long, it is possible to determine that the circulation pump 19 is abnormal, and when the fluid pressure becomes too high, it is determined that the filter 20 in use between the two filters 20, 20 is clogged. It is possible. That is, the hydraulic pressure sensor 66
The dust collector control unit 65 sets the circulation pump 1
9 and the filter 20 can be detected.

The stroke sensors 67 and 68 detect the valve body strokes of the electromagnetic on-off valves 33 and 53. When the signal for opening the electromagnetic on-off valves 33 and 53 is output from the dust collector control unit 65, the stroke sensors 67 and 68 detect the stroke. Each on-off valve 33, 53
When the stroke sensors 67 and 68 detect that the valve body has not moved to the valve opening position, the dust collector control unit 65 determines that the electromagnetic on-off valves 33 and 53 are abnormal.

The liquid level sensor 69 can detect the liquid level of the processing liquid in the processing tank 6 in four stages of "HH", "H", "L", and "LL". When the detection value of the sensor 69 is “HH”, the dust collector control unit 65 determines that the overflow pipe 51 is clogged or that the liquid level sensor 69 itself is abnormal. When the value is “LL”, the dust collector control unit 65 determines that the water supply valve (not shown) is abnormal, the water supply source is closed, or the liquid level sensor 69 itself is abnormal.

The detection value "H" of the liquid level sensor 69,
“L” is for controlling the water supply into the processing tank 6, and when the detection value of the liquid level sensor 69 is “L”, the dust collector control unit 65 is used to supply water into the processing tank 6. When the water supply valve is opened, and the detection value of the liquid level sensor 69 is “H”, the dust collector control unit 65 closes the water supply valve. The liquid level in 6 is in the range between “L” and “H”.

Since the temperature sensor 70 detects the temperature inside the exhaust pipe 48, the dust collector control unit 65
When the temperature detected by the temperature sensor 70 is abnormally high, it can be determined that a fire has occurred in the wet dust collector 2 or there is a possibility that a fire may occur. At this time, by opening the water supply valve 14 manually or automatically by an operator and injecting water from the water injection nozzle 12 toward the turbo fan 9 side, the occurrence of a fire is prevented or the fire is extinguished. It is possible.

The flow rate sensor 71 detects the gas flow rate in the conduit 28, and the dust collector control unit 65
Based on the detection value of the flow velocity sensor 71, the turbo fan 9
And an abnormality of the turbo fan 9 is determined. That is, the dust collector control unit 65 includes the flow rate sensor 7
The inverter controls the turbo fan 9 so that the detected value of 1 is within a preset range. The lower limit of the range is a value for preventing welding fume from adhering and accumulating on the inner surface of the conduit 28. In this embodiment, the speed is 20 m / sec. When the speed is equal to or less than the lower limit, the dust collector control unit 65 determines that the inverter of the turbo fan 9 is abnormal. The upper limit of the above range is a value for guaranteeing that the laser welding by the laser welding machine 1 is performed in a nitrogen gas atmosphere having a concentration of, for example, 99.7% or more.
m / sec.

The welding machine control unit 61 controls the operation of the laser welding machine 1 in accordance with the procedures shown in FIGS. 6 and 7. First, in step S1 of FIG.
Is "1". This flag FR
In the first processing cycle, it is set to “1” and becomes “1” by the operation of the reset switch 64. Since FR = 1 in the first processing cycle,
The process proceeds from step S1 to step S2.

In step S2, it is confirmed whether or not the flag FS is "1". Although this flag FS is set to “0” in the first processing cycle, it becomes “1” in response to the start permission signal input from the dust collector control unit 65, and FS = 0. When FS = 1, the process proceeds from step S2 to step S8.

In step S3, it is determined whether or not the start switch 62 has been operated. If it has been determined that the start switch 62 has been operated, a start signal is output in step S4. Will be given to

In step S5, the dust collector control unit 6
It is checked whether or not an abnormal signal has been input from step 5, and if no abnormal signal has been input, the process proceeds from step S5 to step S6, and if an abnormal signal has been input, the process proceeds from step S5 to step S13.

If it is determined in step S5 that an abnormal signal has not been input, it is checked in step S6 whether a start permission signal has been input from the dust collector control unit 65, and if it has been confirmed that the start permission signal has been input. After setting the flag FS to "1" in step S7, the automatic operation of the laser welding machine 1 is performed in step S8.

In the next step S9, it is confirmed whether or not an abnormal signal is input from the dust collector control unit 65.
When it is confirmed that no abnormal signal is inputted, the process proceeds from step S9 to step S10, and when it is confirmed that an abnormal signal is inputted, the process proceeds from step S9 to step S14.

In step S10, it is confirmed whether or not the stop switch 63 has been operated. If the operation of the stop switch 63 has been confirmed, the automatic operation of the laser welding machine 1 is stopped in step S11 and a stop signal is output. This stop signal is given to the dust collector control unit 65. Further, after the processing in step S11 is completed, the flag FS is set to “0” in step S12.

When the input of the abnormal signal is confirmed in step S5 until the start permission signal is input from the dust collector control unit 65 after the operation of the start switch 62, the dust collector control unit 65 starts the operation before the laser welding machine 1 starts. A flag FA indicating that an abnormal signal has been input is set in step S
After setting "1" in step 13, abnormal processing is executed in step S14. When it is confirmed in step S9 that an abnormal signal has been input from the dust collector control unit 65 after the automatic operation of the laser welding machine 1 has been started in response to the input of the start permission signal, abnormal processing is executed in step S14.

The abnormality processing in step S14 is executed according to a subroutine shown in FIG. 7. In step S15, it is confirmed whether or not the flag FA is "1", and it is confirmed that FA = 1. When an abnormal signal is input from the dust collector control unit 65 before the start of the laser welder 1, the stop signal is output to the dust collector control unit 65 with the laser welder 1 stopped in step S 16. , The flag FA in step S17
Is set to “0”. Also, in step S15, FA = 0
Is confirmed, that is, when an abnormal signal is input from the dust collector control unit 65 after the automatic operation of the laser welding machine 1 is started, in step S18, the laser welding machine 1 is stopped and the laser welding machine 1 is stopped. Is discharged, and a stop signal is output to the dust collector control unit 65 to give it.

After the processing in steps S17 and S18 is completed, the flag FS is set to "0" in step S19, and in step S20, it is confirmed whether or not an abnormality clearing signal is input from the dust collector control unit 65. When the input of the abnormality release signal is confirmed, it is confirmed whether or not the reset switch 64 has been operated in step S21, and when the operation of the reset switch 64 has been confirmed, the flag FR is set to "1" in step S22.

If the input of the abnormality release signal from the dust collector control unit 65 is not confirmed in step S20,
If the operation of the reset switch 64 is not confirmed in step S21, the flag F is set in step S23.
Set R to "0".

When the control procedure by the welding machine control unit 61 is summarized, the welding machine control unit 61 gives a start signal to the dust collector control unit 65 in accordance with the operation of the start switch 62 and controls the operation of the stop switch 63. Accordingly, a stop signal is given to the dust collector control unit 65, and after the start signal is output, the laser welding machine 1 is started in response to the start permission signal input from the dust collector control unit 65, and in response to the operation of the stop switch 63. The operation of the laser welding machine 1 is controlled such that the operation of the laser welding machine 1 is stopped. When an abnormal signal is input from the dust collector control unit 65 regardless of before or after the start of the laser welder 1, the welder control unit 61 stops the operation of the laser welder 1 and outputs a stop signal to the dust collector control unit 65. When a failure release signal is input from the dust collector control unit 65 in accordance with the failure release operation on the wet dust collector 2 side, a start signal is given to the dust collector control unit 65 in response to the operation of the reset switch 64. Become.

On the other hand, the dust collector control unit 65
The operation of the wet dust collector 2 is controlled according to the procedure shown in FIG. 10. First, in step S31 in FIG. 8, it is confirmed whether or not the flag FE is "1". This flag FE
Is "1" when the operation of the wet dust collector 2 is stopped, and is "0" in the first processing cycle.

When it is confirmed in step S31 that FE = 0, it is confirmed in step S32 whether or not a stop signal has been input from the welding machine control unit 61, and that no stop signal has been input. In step S33, it is confirmed whether or not a start signal is input from the welding machine control unit 61. When the input of the start signal is confirmed, the process proceeds from step S33 to step S34.

In step S34, the turbo fan 9 is controlled based on the input of the start signal from the welding machine control unit 61.
Then, the circulating pump 19 is operated, and the electromagnetic on-off valves 33 and 53 are opened. In step S35, the detection values of the sensors 66 to 71 are read, and in step S36, the wet dust collector is operated in accordance with the subroutine shown in FIG. In step 2, it is determined whether an abnormality has occurred.

When it is confirmed in step S31 that FE = 1, in step S37, it is confirmed whether or not the flag FF is "1". This flag FF
Is set to "1" when an abnormality occurs in the wet dust collector 2, and is set to "0" in the first processing cycle and in the abnormality release state. When it is confirmed in step S37 that FF = 0, the process proceeds from step S37 to step S32, and when it is confirmed that FF = 1, the process proceeds from step 37 to step S38.

In step S38, it is confirmed whether or not the abnormality in the wet dust collector 2 has been cleared. That is, when an abnormality has occurred in the turbo fan 9, it is confirmed whether or not the abnormality in the turbo fan 9 has been canceled based on the detection value of the flow rate sensor 71. It is confirmed whether the abnormality of the circulation pump 19 has been cleared based on the detected value, and if the filter 20 in use is clogged, it is determined whether the clogged state has been cleared by switching the filters 20 and 20. Confirmed based on the detection value of the pressure sensor 66,
When an abnormality occurs in the solenoid valves 33 and 53,
It is confirmed whether the abnormality has been cleared by replacement of the water or the like based on the detection values of the stroke sensors 67 and 68. If the detection value of the temperature sensor 70 is too high, the temperature is sufficiently increased by the water injection from the water injection nozzle 12. Is checked based on the detection value of the temperature sensor 70, and if an abnormality has occurred in the liquid level in the processing tank 6, whether or not the abnormality has been eliminated based on the detection value of the liquid level sensor 69 Check if.

When it is confirmed in step S38 that the abnormality has been cleared in the wet dust collector 2, the flag FF is set to "0" in step S39, and in step S40 thereafter,
An abnormality release signal to be given to the welding machine control unit 61 is output.

If it is determined in step S32 that the stop signal has been input, the process proceeds to step S4.
In 1, the stop processing according to the subroutine shown in FIG. 10 is executed.

In FIG. 9, in a step S42, it is confirmed whether or not the flag FT is "1". This flag F
T becomes “1” when a set time set for judging an abnormality at the start of the wet dust collector 2 has elapsed, and FT = 0 in the first processing cycle.

When it is confirmed in step S42 that FT = 0, in step S43, the timer tS
Is counted, and it is determined in the next step S44 whether or not the count time tS is equal to or longer than the set time T1. Thus, the set time T1 is necessary for the detection values of the sensors 66 to 71 to become stable from the start of the operation of the turbo fan 9 and the circulation pump 19 in the wet dust collector 2 and from the opening of the electromagnetic on-off valves 33 and 53. Time is set.

When it is determined in step S42 that tS ≧ T1, the timer tS is reset in step S45, and in step S46, it is determined whether or not the wet dust collector 2 is in the first abnormal state. The first abnormal state includes an abnormality of the circulation pump 19, a clogging of the filter 20,
This is a state in which at least one of the abnormalities of the electromagnetic on-off valves 33 and 53, the abnormal liquid level in the processing tank 6, and the abnormal of the turbo fan 9 has occurred.
7, 68, the first abnormal state is determined based on the detection values of the liquid level sensor 69 and the flow rate sensor 71.

If it is determined in step S46 that the wet dust collector 2 is not in the first abnormal state, a start permission signal to be given to the welding machine control unit 61 is output in step S47, and the flag FT is set to "1" in step S48. To "."

If it is determined in step S46 that the wet dust collector 2 is in the first abnormal state, the process proceeds to step S4.
In step 9, an abnormal signal to be given to the welding machine control unit 61 is output, and in step S50, the flag FF is set to "1".

If it is determined in step S42 that FT = 1, the process proceeds from step S42 to step S51.
In step S51, it is checked whether or not the filter 20 is clogged based on the detection value of the hydraulic pressure sensor 66. When it is confirmed that the filter 20 is clogged, in step S52, the welding machine is After outputting the abnormal signal to be given to the control unit 61, the flag F is set in step S53.
F is set to "1", and the routine proceeds to step S54. When it is confirmed in step S51 that the filter 20 is not clogged, the process goes to step S54, bypassing steps S52 and S53.

In step S54, the wet dust collector 2
Check if there is an abnormal condition. The second abnormal state includes at least one of an abnormality of the circulation pump 19, an abnormality of the electromagnetic on-off valves 33 and 53, an abnormality of the liquid level in the processing tank 6, an abnormal temperature of the exhaust pipe 48, and an abnormality of the turbo fan 9. And the hydraulic pressure sensor 66 and the stroke sensor 6
7, 68, the liquid level sensor 69, the temperature sensor 70, and the flow rate sensor 71 determine the second abnormal state based on the detection values.

If it is determined in step S54 that the wet dust collector 2 is in the second abnormal state, the process proceeds to step S5.
At 5, an alarm signal is output to be applied to the alarm device 60. Based on the alarm signal, the alarm 60 is activated by sound and display.

In FIG. 10, in a step S56, the timer tE is counted, and it is determined in a next step S57 whether or not the count time tE is equal to or longer than a set time T2, for example, 1 minute, and tE ≧ T2. When it is confirmed that the count time tE
Is longer than a set time T3 longer than the set time T2, for example, 1 minute and 30 seconds.

When it is confirmed in step S58 that tE <T3, that is, when T2 ≦ tE <T3, in step S59, the operation of the circulation pump 19 is stopped, and water is supplied to the nozzles 50, 50. The electromagnetic on-off valve 53 is closed.

If it is determined in step S58 that tE ≧ T3, it is determined in step S60 whether or not the count time tE is equal to or longer than the set time T4, for example, 2 minutes, which is longer than the set time T3.

When it is confirmed in step S58 that tE <T4, that is, when T3 ≦ tE <T4, in step S61, the compressed air for spraying is supplied to each of the sprayers 29, 29,. Is closed.

Further, when it is confirmed in step S60 that tE ≧ T4, the operation of the turbo fan 9 is stopped in step S62, the timer tE is reset in step S63, and the flag FE is set to “1” in step S64.
Set to.

When the control procedure by the dust collector control unit 65 is summarized, the dust collector control unit 65 starts the operation of the wet dust collector 2 in response to the start signal input from the welding machine control unit 61, and receives the start signal from the start signal input. In response to determining that the wet dust collector 2 is operating normally based on the detection values of the sensors 66 to 71 when the set time has elapsed, a start permission signal is sent to the welding machine control unit 6.
1, after a predetermined delay time (one minute in this embodiment) from the input of the stop signal from the welding machine control unit 61, the operation of stopping the operation of the wet dust collector 2 is executed. Control. Moreover, the dust collector control unit 65 constantly monitors the abnormality of the wet dust collector 2, and when it is determined that an abnormality has occurred, an abnormal signal is given to the welding machine control unit 61. When a stop signal is input from the machine control unit 61, the operation of the wet dust collector 2 is stopped.

Next, the operation of this embodiment will be described. The welding fume generated by the laser welding machine 1 is guided to the wet dust collector 2 together with the nitrogen gas, and the first to third dust collecting sections 3 and 3 of the wet dust collector 2 are provided. At steps 4 and 5, the wet dust collection processing is sequentially performed. At this time, the spray mist diameter in the first to third dust collecting sections 3 to 5 is sequentially reduced. That is, the minimum mist diameter by the sprayers 29 in the first dust collecting section 3 is, for example, 1.0 μm or more, and the nozzle 2 in the second dust collecting section 4
5 is, for example, 0.5 to 1.0 μm
And the mesh diameter of the filter 20 in the second dust collecting section 4 is set to, for example, 1.0 μm. Therefore, the welding fumes are sequentially removed from large ones, the fumes are efficiently captured by the filter 20, and the gas passing through the mechanical filter 10 does not contain fumes of 1.0 μm or more. The minimum mist diameter of the nozzles 50 in the third dust collecting section 5 is 0.5 μm, so that fine fumes that could not be captured by the mechanical filter 10 are effectively captured. The wet dust collection efficiency in the sections 3 to 5 can be increased to, for example, 99.8% or more.

In the first dust collecting section 3, the conduit 28
A plurality of sprayers 29, 29 for spraying a processing liquid, comprising a first inclined pipe portion 28c which is inclined so as to become lower as it goes toward the processing tank 6 at least from the intermediate portion to the second dust collecting portion 4 side. Are provided in the first inclined tube portion 28c. Therefore, a part of the welding fume is removed from the gas by the processing liquid sprayed from the sprayers 29, 29, and the processing liquid containing the removed welding fume is supplied to the first inclined pipe section 2
8c, it flows along the inner surfaces of the second inclined tube portion 28d and the horizontal tube portion 28e to the processing tank 6 side, and does not flow to the laser welding machine 1. Therefore, the inner surface of the conduit 28 is wet with the processing liquid sprayed from the sprayers 29, 29,..., And this processing liquid flows to the processing tank 6, so that welding fumes can be prevented from adhering to the inner surface of the conduit 28. Even if the conduit 28 is made of a synthetic resin, there is no possibility that a fire will occur.

In the second dust collecting section 4, the processing liquid sucked by the circulation pump 19 from the bottom of the processing tank 6 circulates in the processing tank 6 so as to be ejected from a plurality of nozzles 25.
A welding fume which is removed from the gas by contact with the processing liquid in the processing tank 6 and becomes granular in the processing liquid;
The welding fume contained in the processing liquid flowing into the processing tank 6 from the inside is removed by the filter 20 during the circulation of the processing liquid by the circulation pump 19. Therefore, the processing liquid in contact with the gas containing the welding fume contains almost no particulate welding fume, and the first and second dust collecting sections 3 and 4 increase the collection efficiency of the welding fume. be able to.

Further, the pair of filters 20 and 20 are
Are connected to the circulating pump 19 via a switching valve 2 and to the nozzles 25 via a switching valve 23. By switching the switching valves 22, 23, one of the pair of filters 20, 20 is selected. Can be used sequentially. Therefore, without stopping the operation of the wet dust collector 2, it is possible to remove the collected welding fume from the clogged filter 20 and eliminate the clogging.

Further, in the case where the processing liquid obtained by mixing the coagulant with water is used in the first and second dust collecting sections 3 and 4,
As the welding fumes in the processing liquid agglomerate and increase in diameter, the welding fumes quickly settle down from near the liquid level of the processing liquid, so that the gas containing the welding fumes is immersed in the processing liquid. It is possible to minimize the dispersion and floating of the granular welding fume. Further, since the processing liquid circulated by the circulation pump 19 passes through the filter 20, the welding fume that has agglomerated and increased in diameter is removed from the filter 2.
At 0, it is effectively removed, and the effective collection of welding fumes becomes possible.

When a surfactant is mixed in the treatment liquid, the fume is immersed in the treatment tank 6 of the second dust collecting part 4 by the action of the surfactant when the welding fume dives into the treatment liquid. It becomes easy to adjust to water, and bubbling is effectively generated on the surface of the processing liquid. The bubbling and spraying of the processing liquid from the plurality of nozzles 25 make the welding fume more effective. Collected.

Further, since the magnet 26 is provided at the bottom of the inside of the processing tank 6, relatively large particles of, for example, several μm or more out of the iron-based welding fume are effectively applied to the magnet 26 in the processing liquid. Thus, the efficiency of capturing the welding fume in the wet dust collector 2 is further enhanced.

The operation of the laser welding machine 1 is controlled by the welding machine control unit 61, while the operation of the wet dust collector 2 is controlled.
Is controlled by the dust collector control unit 65. Thus, the welding machine control unit 61 outputs the start signal and the stop signal in response to the operation of the start switch 62 and the stop switch 63, and performs the laser welding in response to the input of the start permission signal after the output of the start signal. The operation of the laser welding machine 1 is stopped according to the operation of the stop switch 63 while starting the welding machine 1. Dust collector control unit 6
5 are sensors 66 to 71 for starting operation of the wet dust collector 2 in response to a start signal input from the welding machine control unit 61 and detecting an abnormality of the wet dust collector 2 when a set time has elapsed from the start signal input. The start permission signal is given to the welding machine control unit 61 in response to the determination that the wet dust collector 2 is operating normally based on the detected value of After the elapse of the delay time, the operation of stopping the operation of the wet dust collector 2 is executed.

Therefore, when the laser welding machine 1 starts, the wet dust collector 2 is always in a normal operation state.
Normal operation of the wet dust collector 2 is continued until a predetermined delay time elapses after the laser welding machine 1 stops. As a result, fumes generated by the laser welding machine 1 do not flow toward the wet dust collector 2 when the wet dust collector 2 is not operating normally, and the fumes generated by the laser welding machine 1 are always processed by the wet dust collector 2. Since the liquid is collected while being cooled by the liquid, the occurrence of fire due to fume can be prevented as much as possible.

The dust collector control unit 65 monitors the abnormality of the wet dust collector 2 based on the detection values of the sensors 66 to 71 even after the automatic operation by the welding machine control unit 61 of the laser welding machine 1 is started. When an abnormal signal is given from the dust collector control unit 65 to the welder control unit 61 in response to detecting an abnormality of the wet dust collector 2, the welder control unit 61 stops the operation of the laser welder 1 and Stop signal is sent to the dust collector control unit 65
And the dust collector control unit 65 executes the stop processing of the wet dust collector 2 according to the input of the stop signal.
Further, when an abnormality occurs in the wet dust collector 2, the operation of the laser welding machine 1 is stopped by the welding machine control unit 61 prior to stopping the operation of the wet dust collector 2, and when the abnormality in the wet dust collector 2 is released, the dust collector control is performed. Unit 645
Switch 6 after the error release signal is output from the
4, the dust collector control unit 65 starts the operation of the wet dust collector 2 and inputs a start permission signal to the welding machine control unit 61. In response to the start permission signal input, the welder control unit 61 starts the laser welding machine. 1 is started. As a result, the welding fume generated by the laser welding machine 1 does not flow toward the wet dust collector 2 when the wet dust collector 2 is stopped, and ignition on the wet dust collector 2 side by the welding fume is prevented as much as possible. .

Moreover, the turbo fan 9 is inverter-controlled by the dust collector control unit 65, and the air volume is not adjusted by the damper. For this reason, the possibility of ignition due to adhesion of welding fume to the damper can be eliminated. That is, in the case where the air volume is controlled by the damper, a large amount of fume adheres to the damper as time elapses, and eventually the fumes are separated and flow at once, thereby increasing the possibility of ignition. However, by performing inverter control, the possibility of ignition due to such fume adhesion is eliminated. In addition, in the air volume control by the damper, it is necessary to secure a space for installing the damper, and work to assemble the damper is also required.However, executing such inverter control can solve such a problem. it can.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, in the above embodiment, the spray air is supplied only to the first dust collecting section 3 of the wet dust collector 2, but the spray air is also supplied to the second and third dust collecting sections 4 and 5. May be introduced. In addition, although the turbo fan 9 is controlled by the dust collector control unit 65 by inverter, the inverter of the turbo fan 9 may be controlled by a manual operation of an operator. Further, one of the surfactant and the coagulant may be mixed with water to prepare a treatment liquid.

[0094]

As described above, according to the present invention, the welding fume trapped in the processing solution is adsorbed by the magnet attached to the processing tank so as to sink into the processing solution, whereby It is possible to prevent the dispersion and floating of the granular welding fume as much as possible, and to improve the trapping efficiency of the welding fume in the wet dust collector.

[Brief description of the drawings]

FIG. 1 is an overall side view of a laser welding machine and a wet dust collector.

FIG. 2 is a schematic vertical sectional view of a main part of the wet dust collector.

FIG. 3 is an enlarged longitudinal sectional view showing a part of a first dust collecting part.

FIG. 4 is an enlarged vertical sectional view of the sprayer.

FIG. 5 is a diagram showing a configuration of a control system.

FIG. 6 is a flowchart showing a processing procedure in a welding machine control unit.

FIG. 7 is a flowchart showing an abnormality processing procedure in the welding machine control unit.

FIG. 8 is a flowchart showing a processing procedure in the dust collector control unit.

FIG. 9 is a flowchart showing an abnormality processing procedure in the dust collector control unit.

FIG. 10 is a flowchart showing a stop processing procedure in the dust collector control unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Laser welding machine 2 ... Wet type dust collector 6 ... Processing tank 26 ... Magnet 28 ... Conduit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirominori Ninomiya 3700 Wadayama, Shimonaka-machi, Sadohara-cho, Miyazaki-gun, Miyazaki Prefecture Inside Honda Rock Co., Ltd. 3700 Wadayama F-term in Honda Lock Co., Ltd. (Reference) 4D032 AA02 AA21 AC07 AC08 AC09 BA03 BA06 BB01 BB20 CA01 DA01 DA04 4E068 CG02 CJ01

Claims (1)

[Claims] A conduit (28) connected to a laser welding machine (1) for generating a gas containing iron-based welding fume is provided in a processing tank (6) for storing a processing liquid. A wet fume collector for welding fume collection, wherein the magnet (26) is attached to the processing tank (6) so as to be submerged in the processing liquid. .