JP3140624B2 - Device for collecting mist flux - 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 for collecting mist flux which is not applied to a wiring board when the mist flux is applied to the wiring board.

[0002]

2. Description of the Related Art A method of spraying a flux from a spray nozzle or the like and applying the flux to a wiring board has been widely used. That is, this technique allows the flux to be applied to the wiring substrate thinly and uniformly. On the other hand,
A method of performing soldering in an inert gas atmosphere has been widely used.

That is, these techniques make it possible to minimize the flux residue on the wiring board after soldering while securing good soldering, and as a result, to purify the wiring board without purification.

However, due to the nature of the spray flux, not all of the sprayed flux can be applied to the wiring board. Therefore, it is necessary to capture and collect the flux that has leaked and prevent the flux from diffusing into the atmosphere. And several techniques related to this have been proposed.

The technique disclosed in Japanese Patent Application Laid-Open No. 5-138342 is a technique for capturing and collecting mist flux by using a filter, and has a filter exchange mechanism (winding mechanism). This is the filtering technique that is being performed.

The technique disclosed in Japanese Patent Application Laid-Open No. 4-41070 is a technique in which kinetic energy is used when mist-like flux is sucked, and the mist is made to collide with a plate-shaped separation plate to capture and collect. is there.

[0007]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open No.
In the technology disclosed in Japanese Patent No. 38342, there is no established technology for effectively utilizing the inherent properties of the filter, and the filtering efficiency is low and the collection efficiency is low. Is too high to cause clogging in a short time. Therefore, there is a disadvantage that the amount of the filter used tends to increase and the running cost tends to increase.

In the technique disclosed in Japanese Patent Application Laid-Open No. 4-41070, the capture and collection are performed depending on the inertial force generated by the movement of the mist flux, so that the capture and collection rate is low. There are easy disadvantages. In other words, since the mist flux exists in a state of fine particles and floats in the air, in the same technology having a small contact area with the mist flux, most of the mist flux is not captured and is practical. In order to secure the trapping / collecting property, another device (for example, a cyclone-type trapping device) is required.

The present invention solves the above-mentioned problems in the prior art, and realizes a trapping device that makes full use of the characteristics inherent in the filter and increases the trapping rate of the mist flux. With excellent maintainability,
And to realize a collecting device fog Jofu Lux not causing collecting leakage.

[0010]

SUMMARY OF THE INVENTION The present invention is characterized in that the properties inherent in a filter are fully and effectively utilized. The structure is also excellent in maintainability, and is designed to minimize collection leakage.

That is, in the apparatus for collecting mist-like flux according to the present invention, the first filter having a plurality of tunnel-like flow passages arranged in a direction in which the mist-like flux flows in a plurality of stages is provided.
Is provided adjacent to the first and second stages
The tunnel-shaped flow passages of the respective stages are mutually connected between the stages.
They are arranged like one another.

A third filter made of activated carbon is provided downstream of the second filter in the direction in which the mist flux flows.

[0013]

[0014]

[0015]

A first filter is formed by fitting at least two or more filter bodies each having a plurality of tunnel-shaped flow passages arranged substantially parallel to each other with their surfaces facing each other. A filter removal jig made of a long plate-like member that is inserted between the surfaces of adjacent filter bodies and that removes the filter body from the frame by rotating about the insertion direction as an axis. is there.

Further, the present invention is a mist flux collecting device used in a mist flux coating device for spraying a mist flux from a spray nozzle to apply and apply the mist flux to a wiring board. Food and on at least one 該搬inlet of entrance and unloading port of the wiring substrate in the coating apparatus of the atomized flux for performing provided et suction guide of the not coated on wiring substrate atomized flux
Or, cover the loading / unloading port and set an entry or exit for the wiring board.
A girder auxiliary hood is connected in front of the first filter.
Is what it is.

[0018]

According to the present invention, since the first filter is provided with a plurality of (many) tunnel-shaped flow passages, the flow surface area thereof can be made very large. Therefore, the contact probability of the mist flux sucked together with the atmosphere (atmosphere) to the flow passage becomes extremely high, and the mist flux having a relatively large particle diameter is almost trapped and collected by the first filter. can do.

The mist flux having a relatively small particle size is captured and collected by a second filter having a small transmission gap, that is, a filter made of a nonwoven fabric.

As a result of the optimum distribution of the filters in this manner, an appropriate load distribution can be adopted without imposing an excessive capturing / collecting load on one filter. That is, when an excessive load is applied to one filter, clogging occurs in a short period of time, and the original function is not fulfilled.

Further, in the first filter and the second filter, liquid or solid flux and its solvent can be captured and collected, but gaseous solvent cannot be captured and collected. . However, by providing the third filter made of activated carbon at the subsequent stage of the second filter, it can be adsorbed and removed. That is, capture and collection without leakage can be performed.

Further, a flux having a relatively large particle size adheres to the first filter and is captured. For this reason, when the amount of accumulation of these increases, they become droplets, and reach a state where they can flow. However, the tunnel-like flow passage of each stage
By arranging them in such a way that each other
When the filter passes between the stages, it easily contacts the filter surface.
And increase the capture / collection rate. By the way, if the flow passage is disposed so as to be oriented substantially vertically, it will drop along the flow passage.

[0023]

[0024]

Further, the filter body can be easily removed from the frame by inserting the plate-shaped member of the filter removal jig and then rotating it. In particular, since the flux has high adhesiveness, the filter body and the frame body may adhere to each other, and it may take time to remove the filter body from the frame body.
That is, with such a configuration, maintainability is improved.

Further, in a mist flux coating apparatus, depending on the length and width of the wiring board to be coated, the sprayed mist flux is transferred to a wiring board entrance or an exit of the apparatus.
May spill, albeit slightly. But the carry-in
Cover the opening at the entrance or the exit, and insert the wiring board.
By providing an auxiliary hood with a mouth or outlet,
Completely capture and collect the mist flux that flows out
can do.

[0027]

FIG. 1 is a block diagram schematically showing an embodiment of the present invention, and shows a state where the present invention is applied to a flux coating apparatus. In this figure, a wiring board 1 is transported by a transport conveyor 2 in the direction of arrow A, and sprays a mist flux 4 from a spray nozzle 3 disposed below the wiring board 1. Then, the mist-like flux 4 not applied to the wiring board 1 is sucked and guided by a hood 5 disposed above the mist-like flux 4. In the following description, the first and second stages are defined based on the flow of the mist-like flux 4.

On the other hand, a unit of the first filter 7 is provided at the upper end, which is a rear position of the hood 5 with respect to the direction in which the mist flux 4 flows, and then a unit of the second filter 8 is provided. The filter unit 9 and the fan 10 are sequentially provided, and the mist flux 4 is discharged from the outlet 11.
Is discharged from Then, each filter 7, 8, 9 and the fan 10 are connected by a pipe section 6, and each filter 7, 8, 9 is connected.
Reference numerals 8 and 9 are formed in the shape of a cartridge, and the replacement thereof can be performed only by removing and inserting operations.

FIGS. 2 and 3 show a specific shape of one embodiment of the present invention. FIG. 2 is a partially cutaway perspective view showing a mode when viewed obliquely from the front, and FIG. FIG. 4 is a partially broken perspective view showing an aspect when viewed obliquely from the rear. In these figures, the same symbols as those in FIG. 1 indicate the same parts,
Numeral 100 indicates the entire mist flux collecting device. 12
Denotes a motor that is a driving source of the fan 10, 13 denotes a housing that houses the first filter 7, and 14 denotes a housing that mounts the second filter 8.

The second filter 8 includes a non-woven fabric 8a and a
4 is formed in a shape to be fitted to the base 15, and after the fitting, the fixing frame 8 b is fitted and fixed.

Further, a third filter 9 containing activated carbon 9a is provided in the upper portion of the rear part of the second
The fan 17 is connected to the base 17 at the subsequent stage, and the atmosphere sucked from the through hole 18 is exhausted from the outlet 11. These are also connected by the piping 6. Note that the third filter 9 is also formed in a cartridge shape, and can be replaced only by removing and inserting operations. 19 is a control unit, and 20A and 20B are front units.
Inlet and outlet der of the wiring substrate 1 which is provided on Kikirijo flux collecting apparatus 100 is, entrance, also referred to as a carry-out port.

FIG. 4 is an exploded perspective view showing the first filter 7. That is, the first filter 7 is an example in which the filter bodies 22A and 22B are fitted into the frame body 21 with the surfaces thereof facing each other. In this example, a plate-like locking piece 24 for locking the filter bodies 22A and 22B is provided at the center position along the frame body 21, and the two filter bodies 22A and 22B are provided.
Is fitted from both sides of the frame body 21 to come into contact with the locking pieces 24 to form one unit.

On the other hand, the filter bodies 22A and 22B are made of, for example, corrugated cardboard, and corrugated plates and flat plates are alternately laminated, and a multilayer corrugated space is used as a tunnel-shaped flow passage 23. . In addition, the frame body 21 is provided with a panel 25 and a handle 26 to facilitate the work of inserting and removing the first filter 7 and to secure the sealing property. It is needless to say that the method of forming the tunnel-shaped flow passages 23 of the filter bodies 22A and 22B is not limited to the above-described corrugated plate and flat plate, but may be various shapes such as a honeycomb shape.

Further, the frame 21 at a position opposite to the panel 25
Is provided with a through hole 27 into which a jig (described later) for removing the filter bodies 22A and 22B is inserted. The panel 25 corresponding to the through hole 27 has a convex portion on the outside and a concave portion on the inside. Is provided. These are necessary when using a filter removal jig described later.

In FIG. 2 , the first filter 7
An example is shown in which the first filter 7 is disposed so that the flow passages 23 of the filter bodies 22A and 22B fitted in the first filter 7 are directed substantially in the horizontal direction. Alternatively, the filter bodies 22A and 22B may be disposed obliquely, and the flow passages 23 may be disposed obliquely to the horizontal direction.

FIGS. 5A and 5B show the filter 22
It is sectional drawing which shows an example of the cross section of A and 22B, and arrangement | positioning. That is, FIG. 5A is a cross-sectional view taken along line II of FIG. 4, and FIG. 5B is a cross-sectional view taken along line II-II of FIG. However, FIG. 5B shows that the filter bodies 22A and 22B
It is sectional drawing at the time of attaching.

As shown in these figures, the hood 5 of FIG.
The atmosphere guided by suction is the filter body 22A,
22B , that is, a corrugated cardboard tunnel-like flow passage 23
Pass through. And at that time, the mist flux that came in contact
4 adheres to the filter bodies 22A and 22B and is captured.

FIG. 5B shows a configuration in which the tunnel-like flow passages 23 of the filter bodies 22A and 22B overlap each other on the adjacent surface. In order to form this tunnel-shaped flow passage 23,
The passages of the two filters 22A and 22B are formed in a stepped manner in advance, and when they are fitted into the frame 21, they are configured so as to cause a difference as shown in FIG. A step for giving an offset of the locking position is formed in the frame body 21 in advance, and the same filter bodies 22A and 22B are used so as to generate a difference as shown in FIG. 5B.

FIG. 6 shows a filter removal jig 31 used for removing the filter bodies 22A and 22B of the first filter 7. FIG. 6A shows the first filter 7 and the removal jig 31. FIG. 6 is a perspective view showing a use mode of FIG.
(B) is a rear view explaining how the filter bodies 22A and 22B come off.

As shown in FIG. 6A, the filter 22
The jig 31 for removing the filters A and 22B comprises a long plate-like member 32, a panel 33 for operating the plate-like member 32, and a handle. A projection 32a is formed at the tip of the plate-like member 32. The projection 32a is a locking portion 25a formed of a recess formed on the inner surface side of the panel 25 of the first filter 7.
It is formed into a shape that fits into The panel 33 provided on the filter removal jig 31 includes a plate-like member 32 and a handle 34.
This is a member for easily attaching.

The procedure for using the filter removing jig 31 is as follows. The plate-like member 32 is inserted into the gap between the filter bodies 22A and 22B from the through holes 27 provided in the frame 21 shown in FIG. The projection 32a of the member 32 is
Is brought into contact with the locking portion 25a. Next, the plate-shaped member 3
6 is rotated about its insertion direction as an axis, FIG.
As shown in (b), the filter bodies 22A and 22B come off in the direction of the arrow.

FIGS. 7 and 8 show how the auxiliary hood is used, showing a state where the auxiliary hood is applied to a flux coating device. FIG. 7 is a schematic sectional view of the flux coating device as viewed from the front, and FIG. 7 is a partially cutaway perspective view, and the illustration of a portion in front of the first filter 7 in FIG. 7 is omitted.
In FIG. 7, it is schematically shows the arrangement of each filter 7,8,9.

[0043] Also, the position of the atomized coating equipment flux of the wiring substrate 1 inlet 20A and outlet 20B, the suction guide atomized flux 4 did not coated on the wiring substrate 1 row
And covers at least one of the carry-in and carry-out ports.
In this configuration, auxiliary hoods 41A and 41B are provided . Soshi
The auxiliary hoods 41A, 41B are
20A and outlet 20 of wiring board 1 of the coating device
It is configured to cover B, but these may be provided only on one side of any of them that exhibit useful effects.

Reference numerals 42A and 42B denote the auxiliary hood 4
Openings for mounting the transport conveyor 2 on 1A and 41B, which are the entrance and exit of the wiring board 1. 43A and 43B are pipe sections connected from the auxiliary hoods 41A and 41B to the pipe section 6, and are connected to a stage preceding the first filter 7.
You.

Next, the operation will be described. Wiring board 1
The atmosphere of the environment in which the mist flux 4 is applied to the hood 5 is guided into the hood 5 by the suction force generated by the fan 10. That is, at this time, the mist-like flux 4 not applied to the wiring board 1 is sucked together.

The first filter 7 allows the mist-like flux 4 to adhere to the first filter 7 to be captured and collected when it comes into contact with the first filter 7. Since the filter bodies 22A and 22B have a large number of tunnel-shaped flow passages 23, their contact areas are large. Therefore, the probability that the mist-like flux 4 contacts the filter bodies 22A and 22B is high, and the capture / collection rate is high.

Next, the second filter 8 composed of the nonwoven fabric 8a has a very small transmission gap. Therefore,
The mist flux 4 that could not be captured and collected by the first filter 7 can be completely captured and removed by the second filter 8.

That is, the first filter 7 and the second filter 8 are trapped by the relative difference in the particle size of the mist flux 4 due to the difference in the shape of the flow passage and the size of the transmission gap. It is possible to appropriately distribute the difference in the concentration and the difference in the contact probability with the filter surface, so that the filter is less likely to be clogged, and the suction force is less reduced.

Next, the flux generally comprises a solid content and a solvent content, and an alcohol-based solvent is frequently used as the solvent. Therefore, the alcohol is vaporized in the flux application process. On the other hand, the amount of alcohol released is regulated (500 ppm or less) for the purpose of preventing pollution. Therefore, when using a flux that does not comply with this regulation (a flux using a highly volatile solvent), it is necessary to capture and collect such a solvent.

The third filter 9 made of activated carbon 9a is a filter provided for that purpose, and a solvent component such as alcohol is captured and collected by the third filter 9.

As described above, the mist-like flux 4 and its solvent component can also be reliably captured and collected, and the diffusion of the flux into the atmosphere can be sufficiently prevented. Further, since the filters 7, 8, and 9 can be formed in a cartridge shape, the replacement operation is extremely easy.

Furthermore, by arranging the tunnel-shaped flow passages 23 of the filter bodies 22A and 22B in the horizontal direction, the trapped and collected flux does not drop and contaminate the peripheral portion.

Further, by disposing the tunnel-shaped flow passage 23 so as to be oblique to the horizontal direction,
The suction motion direction of the mist flux 4 changes, the probability of contact between the mist flux 4 and the filter surface increases, and the capture and collection rate can be further increased. The flux trapped and collected on the first filter 7 does not drop and contaminate the peripheral portion.

By the way, in the configuration in which the tunnel-shaped flow passage 23 is disposed in the vertical direction, the trapped and collected flux is dropped by gravity under the gravity.

Also, since the filter bodies 22A and 22B are arranged in multiple stages and are arranged so as to cause a difference between the flow paths 23, the mist-like flux 4 and the surfaces of the filter bodies 22A and 22B at the different parts are different from each other. Contact probability is increased, and the capture and collection rate can be increased.

Further, by using the first filter 7 and the filter removal jig 31, the filter 2
Exchange of 2A and 22B can also be easily performed. In addition,
The replacement of the second filter 8 is also easy from its configuration.

The fact that the replacement of the filter bodies 22A and 22B can be easily performed is an important matter for the following reasons. That is, the filter body 22
This is because the mist-like flux 4 captured and collected by A and 22B has strong adhesiveness and easily adheres to the frame 21 and the base. Originally, the filter body had to be air-tightly fixed to the frame or base for the purpose, so that the adhesion easily occurred.

[0058] Further, it atomized flux 4 of the coating equipment distribution <br/> line substrate 1 of the inlet 20A, to the outlet 20 B, covering the opening
Opening 42 serving as an entrance or exit of the wiring board
Since the auxiliary hoods 41A and 41B provided with A and 42B are provided, it is possible to sufficiently capture and collect the mist-like flux 4 that is going to diffuse into the atmosphere from the inlet 20A and the outlet 20B .

As described above, according to the present invention, the first filter formed by arranging a plurality of tunnel-shaped flow paths in parallel is a mist-like flow path.
Installed adjacent to the front and rear stages in the
And the tunnel-shaped flow passage of each stage is
It is disposed so as differ from each other between a second filter consisting of a fine non-woven fabric than the first filter, since it is sequentially arranged with respect to the direction of circulation of the mist flux distribution surface area Can be very large. Therefore, of the mist flux sucked together with the atmosphere (atmosphere), the mist flux having a relatively large particle size can be almost captured and collected by the first filter, and the relatively large mist flux can be collected. Is collected and collected by the second filter. Further, when the mist-like flux passes between the stages, the mist-like flux easily comes into contact with the filter surface, and the trapping / trapping rate can be increased.

As a result of the optimum distribution of the filters in this manner, an appropriate load distribution can be adopted without giving an excessive capturing / collecting load to one filter. That is, when an excessive load is applied to one filter, clogging occurs in a short period of time, and the original function is not fulfilled.

Since the third filter made of activated carbon is provided downstream of the second filter with respect to the direction in which the mist flux flows, the gasified solvent can be adsorbed and removed by the activated carbon. That is, capture and collection without leakage can be performed.

Further, since the flow path of the first filter is disposed so as to be substantially horizontal, a flux having a relatively large particle size adheres to the first filter to increase the amount of accumulated and collected liquid droplets. In addition, even when the liquid is in a flowable state, the liquid does not drip, and the peripheral portion of the filter is not unnecessarily stained.

Further, since the flow path of the first filter is disposed so as to be oblique to the horizontal direction, the mist flux entering the flow path changes its flow direction, so that it contacts the filter surface. It will be easier. That is, the capture / collection efficiency is improved.

Further, the first filter is provided adjacent to the flow direction of the multi-stage mist flux, and the tunnel-shaped flow passages of each stage are arranged so as to be mutually displaced between the stages. Mist flux makes it easier to contact the filter surface when passing
The collection rate can be increased.

Further, at least two or more filter bodies each having a plurality of tunnel-shaped flow passages arranged side by side are fitted to the frame body with their faces facing each other to form the first filter, and these filter bodies are adjacent to each other. A filter removal jig is inserted between the surfaces of the filter body to remove the filter body from the frame by rotating about the insertion direction as an axis, so that the filter body can be easily removed from the frame. . In particular, since the flux has high adhesiveness, it is possible to eliminate the case where the filter body and the frame body stick to each other to remove the filter body from the frame body, thereby improving maintainability.

Further, there is provided a mist flux collecting device used in a mist flux coating device for spraying a mist flux from a spray nozzle to apply and apply the mist flux to a wiring board. provided 該搬inlet to at least one of the wiring entrance of the hood and the wiring substrate in the coating apparatus of the atomized flux for the substrate perform suction guide atomized flux not coated on and unloading port or
Or the exit of the wiring board and the entrance or exit of the wiring board.
Since the provided auxiliary hood is connected to the front side of the first filter, it is possible to completely capture and prevent the sprayed mist-like flux from flowing out from the inlet or the outlet, though slightly.
It has the advantage that it can be collected.

Further, the surroundings of each filter are not contaminated and the maintenance is excellent. No trapping leakage occurs for solvent components. That is, a collection device with extremely low environmental pollution can be realized.

Furthermore, the effective running time (the time during which the filter exhibits effective performance) can be lengthened.
As a result, there are various advantages such as a low running cost, a small decrease in the suction / collection ability gradually generated during operation, and the ability to maintain the collection ability for a long period of time.

[Brief description of the drawings]

FIG. 1 is a partially cutaway schematic view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing an aspect of the specific shape of FIG. 1 as viewed obliquely from the front.

FIG. 3 is an oblique perspective view showing a state in which FIG. 2 is viewed obliquely from the rear, with a part cut away and a part pulled out.

FIG. 4 is an exploded perspective view showing a first filter.

FIG. 5 is a cross-sectional view showing an example of a cross section and an arrangement of the filter body of FIG.

FIG. 6 is a perspective view showing a filter removal jig used for removing the filter body of FIG. 4 and a rear view for explaining a removal operation.

FIG. 7 is a schematic cross-sectional view showing an example of usage of an auxiliary hood.

8 is a perspective view showing a part of the auxiliary hood of FIG. 7 in a cutaway manner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiring board 2 Conveyor 3 Spray nozzle 4 Atomized flux 5 Hood 6 Piping part 7 First filter 8 Second filter 8a Non-woven fabric 9 Third filter 9a Activated carbon 10 Fan 11 Outlet 21 Frame 22A Filter 22B Filter Body 23 Flow passage 27 Through-hole 31 Filter removal jig 32 Plate member 41A Auxiliary hood 41B Auxiliary hood 100 Device for collecting mist flux

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H05K 3/34 B23K 1/00 B01D 46/00 B05B 15/04

Claims (4)

(57) [Claims] 1. A direction in which a first filter having a plurality of tunnel-shaped flow passages arranged in parallel flows a plurality of mist-like fluxes.
Provided adjacent to the front and rear stages for
Tunnel-shaped flow passages in each stage conflict with each other
And a second filter made of a non-woven fabric having a finer size than the first filter is sequentially arranged in a flowing direction of the mist flux. Collector. 2. The apparatus for collecting mist flux according to claim 1, wherein a third filter made of activated carbon is provided downstream of the second filter in a direction in which the mist flux flows. A feature for collecting mist flux. 3. A plurality of tunnel-like flow passages are arranged in parallel substantially in parallel.
At least two filter bodies face each other.
When the first filter is constructed
They are inserted between the surfaces of these adjacent filter bodies.
Is rotated by using the insertion direction as an axis.
From a long plate-like member that removes the filter body from the frame
A filter removal jig.
3. The device for collecting mist flux according to claim 1 or 2. I 4. A collecting device der mist flux used from the spray nozzle to the coating apparatus of the mist flux the coating-applying atomized flux sprays the wiring board, spraying position of the atomized flux Food and on at least one該搬inlet of entrance and unloading port of the wiring substrate in the coating apparatus of the atomized flux for suctioning guide atomized flux not coated on providing et Re the wiring substrate in the periphery
Or an entrance or exit of the wiring board, which covers the carry-out port
Auxiliary hood is connected to the front side of the first filter
4. The method according to claim 1, wherein
An apparatus for collecting mist flux according to any of the claims.