JPH09234561A - Foaming tube assembly for foaming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily exchange a foaming tube without removing a pressing piece. SOLUTION: A connection piece 3 to connect a feed pipe is fixed to one end of four fitting rods 6, a fixing piece 5 is fixed to the other end of the fitting rods 6, and the connection piece 3 and the fixing piece 5 are fixed at a larger interval than the length of the foaming tube 1. A pressing piece 8 is slidably inserted at the fitting rods close to the fixing piece 5. The pressing piece 8 is pressed by a spring 10 fitted to the fitting rod 6 between the fixing piece 5 and the pressing piece 8 through a packing 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam tube assembly used in a foaming apparatus for applying a flux to a substrate.

[0002]

2. Description of the Related Art There is a flux applying step as a step prior to a board soldering step, and a foaming device is used in this applying step. In this foaming device, a foaming tube having a large number of small holes is submerged in a liquid of flux and compressed air is supplied into the foaming tube for foaming. 5 and 6 show an example of a foam tube assembly used in a conventional foaming apparatus. Both ends of the foam tube 1 having the air passage 1A inside are
In order to prevent air leakage, the fasteners 24, 24 are pressed through the packings 23, 23. That is, both ends of the mounting rod 25 with a screw are inserted into the fixture 24, and the fixture 24 is tightened with the nut 27 via the washer 26. Although only one mounting rod 25 is shown in the figure,
Four fasteners 24 are used so as to be tightened at four places. One of the fixtures 24 has a supply pipe 28 for compressed air.
Is attached. The foamed tube assembly A assembled as described above is accommodated in a flux tank, a nozzle is placed on the upper portion of the foamed tube assembly A, and the foamed tube is compressed by the compressed air supplied from the supply pipe 28. Bubbles of flux are generated by the air blown from the surface of No. 1, and bubbles emitted from the nozzle are applied to the substrate passing above the bubbles.

[0003]

The foamed tube 1 needs to be replaced about once a month because of clogging due to adhesion of solids and deterioration due to solvent. In the conventional structure, the nut 27 is loosened, the fixture 24 is removed from the mounting rod 25, the foam tube 1 is removed, a new foam tube is attached, and the nut 27 is screwed. At this time, if the foamed tube assembly A is twisted, air leaks from both ends of the foamed tube 1 and non-uniform bubbles are generated. Therefore, in order to prevent this, the center of the fixture 24 should be set in a flat place. At the same time, it is necessary to perform the installation work while paying close attention.

Furthermore, it is necessary to confirm whether or not the assembly has been carried out correctly by submerging it in a flux liquid and foaming it. One-time assembly was not enough, and it was often repeated 2-3 times, and it took about one hour for replacement work.
The present invention has been made in view of the above points, and an object of the present invention is to provide a foaming device that allows replacement of a foaming tube without removing a metal fitting, and facilitates replacement work.

[0005]

In order to achieve the above object, the present invention is characterized in that a hollow foam tube having an air passage into which compressed air is introduced is penetrated in the longitudinal direction thereof is submerged in a flux liquid. A foamed tube assembly for a foaming device that supplies compressed air to an air passage to foam from the surface of a foamed tube, the foamed tube assembly having a contour larger than the outer diameter of the foamed tube and a distance larger than the length of the foamed tube. And a plurality of mounting rods that connect the connection fittings and the fixing fittings on the outside of the foam pipe arranged between the connection fittings and the fixing fittings. A holding metal fitting that has a contour larger than the outer diameter of the foamed pipe and is movably assembled to the plurality of mounting rods at a position near the fixing metal fitting between the connecting metal fitting and the fixing metal fitting, and the connecting metal fitting faces the pressing metal fitting. The surface and the presser fitting are connected And the air passage in a state in which the end of the foam tube is in close contact with the packing provided in the connection fitting, and the packing is provided on each of the open surfaces and is capable of closely contacting the end of the foam tube. And a spring provided between the pressing fitting and the fixing fitting for urging the pressing fitting toward the connecting fitting.

In the present invention, the holding metal fitting is movably attached to the mounting rod, and is pressed against the end surface of the foam tube by the spring. Therefore, when replacing the foam piping, the holding metal fitting is manually moved in the direction of the spring. If you push it away from the foam tube, you can freely put in and out the foam tube.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. 1 and 2, the foam tube 1 is formed into a cylindrical shape by a member having a large number of small holes, and an air passage 1A into which compressed air is introduced is formed therein. Composed.
The connection fitting 3 for connecting the supply pipe is fixed to one end of the four mounting rods 6 by the nut 4, and the fixing fitting 5 is fixed to the other end of the mounting rod 6 by the nut 7. The connecting fitting 3 and the fixing fitting 5 have a larger contour than the foam tube 1,
The four mounting rods 6 are arranged with a space larger than the outer diameter of the foam tube 1, and the connecting metal fitting 3 and the fixing metal 5 are fixed to face each other with a space larger than the length of the foam tube 1. . A holding metal fitting 8 having a larger contour than the foam tube 1 is movably incorporated in the four mounting rods 6 at a position between the fixing metal fitting 5 and the connecting metal fitting 3 near the fixing metal fitting 5. Springs 10 are attached to the four mounting rods 6 near the fixing fitting 5 at four locations to urge the holding fitting 8 toward the connecting fitting 3.

A packing 2 is interposed between the inner surfaces of the connecting fitting 3 and the fixing fitting 5 and the foam tube 1, and the packing 2 is brought into close contact with both end surfaces of the foam tube 1 so that air from the air passage 1A is blown. It prevents leakage. Receiving metal fittings 9 are attached to the lower two mounting rods 6, and the receiving metal fittings 9 have an upwardly open concave portion 9a having a shape matching the outer circumference of the foam tube 1.
Are formed. The recess 9a engages with the outer periphery of the foam tube 1 to support the foam tube 1 from below, and the center of the foam tube 1 is aligned with the centers of the connecting fitting 3 and the fixing fitting 5. The supply pipe 11 (see FIG. 3) is connected to the joint 3 a of the connection fitting 3.

Foamed tube assembly A constructed as described above
Are contained in a flux tank 13 as shown in FIG.
A drain cock 18 is provided at the bottom of the flux tank 13. A specific gravity sensor 14 is provided in the flux tank 13.
A specific gravity management block 14 including a, a liquid level sensor 14b, and a thermometer 14c is attached. A nozzle 15 for applying a flux is covered on the top of the foam tube 1.
The nozzle 15 has a width that covers the entire foam tube 1,
A slit-shaped nozzle portion 15a is formed on the upper end portion. The flux tank 13 is housed in a case 16, and the height with respect to the case 16 can be adjusted by a height adjusting screw 17.

The supply pipe 11 is led out from a hole 16a in the side wall of the case 16 and connected to the fluid circuit shown in FIG. The fluid circuit includes an electromagnetic valve 19 connected to an air compressor, a regulator 20, and a flow rate adjusting valve 21. The flux tank 13 is filled with the flux liquid. Compressed air is supplied from the air compressor into the foam tube 1, whereby bubbles are blown out from the nozzle portion 15a,
Flux is applied to the substrate passing therethrough.

As described above, according to the present embodiment, one end of the foamed tube 1 is pressed by the movable pressing member 8 urged by the spring 10, so that when the foamed tube 1 is replaced. Can easily take out the foam tube 1 by pushing the pressing metal piece 8 toward the spring 10 with a hand or the like and separating it from the foaming tube 1. Also, when the foaming tube 1 is attached, the pressing metal piece 8 should be pressed in a state of being pressed. By placing the foamed tube 1 on the metal fitting 9 and releasing the hand from the metal fitting 8, the assembly can be performed in the positioned state.

[0012]

As described above in detail, according to the present invention, a hollow foam tube having an air passage into which compressed air is introduced is pierced in its longitudinal direction is submerged in the flux liquid, and compressed in the air passage. A foam tube assembly for a foaming device that supplies air to foam from the surface of a foam tube, the foam tube assembly having a contour larger than the outer diameter of the foam tube and spaced apart from each other at a distance larger than the length of the foam tube. Connection fittings and fixing fittings arranged facing each other, a plurality of mounting rods connecting the connection fittings and the fixing fittings outside the foam pipe arranged between the connection fitting and the fixing fitting, and the outside of the foam fitting pipe. A holding metal fitting that has a contour larger than the diameter and is movably assembled to the plurality of mounting rods at a position near the fixing metal fitting between the connecting metal fitting and the fixing metal fitting, and a surface where the connecting metal fitting faces the holding metal fitting and the holding metal fitting. On the surface facing the connection fitting And a packing that can be brought into close contact with the end of the foamed pipe and the connection fitting, which is connected to the air passage while the end of the foamed pipe is in close contact with the packing provided in the connection fitting. A joint is provided, and a spring is provided between the pressing fitting and the fixing fitting to urge the pressing fitting toward the connecting fitting. Therefore, a spring provided between the holding metal fitting and the fixing metal fitting urges the holding metal fitting toward the foam tube, and presses the connecting metal fitting and the holding metal fitting to both ends of the foam tube through the packing. When
The foam tube can be easily taken in and out simply by moving the holding metal fitting and separating it from the foam tube, and since the spring force is evenly applied to the foam tube, there is no risk of twisting as long as the attachment position of the foam tube is determined. An accurate foam tube assembly can be constructed in a short time.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a foamed tube assembly for a foaming device of the present invention.

FIG. 2 is a side view of the foamed tube assembly for the foaming device according to the embodiment.

FIG. 3 is an exploded perspective view of a foaming device to which the foamed tube assembly of one embodiment is applied.

FIG. 4 is a circuit diagram showing an example of a fluid circuit connected to a foaming device.

FIG. 5 is an exploded perspective view of a conventional foam tube assembly for a foaming device.

FIG. 6 is a vertical cross-sectional side view of a conventional foam tube assembly for a foaming device.

[Explanation of symbols]

1 ... Foam tube, 2 ... Packing, 3 ... Connection fitting, 5 ...
… Fixing metal fittings, 6 …… mounting rods, 8 …… pressing fittings, 9 …… receiving fittings, 9a …… recesses, 10 …… springs, 11 …… supply pipes,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Dan Ei 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (3)

[Claims] 1. A hollow foam tube having an air passage into which compressed air is introduced is penetrated in a longitudinal direction thereof is immersed in a flux liquid, and compressed air is supplied to the air passage to foam from a surface of the foam tube. A foaming pipe assembly for a foaming device, wherein the connecting fitting and the fixing fitting have a contour larger than the outer diameter of the foaming pipe and are arranged to face each other with a gap larger than the length of the foaming pipe. A plurality of mounting rods that connect the connection fittings and the fixing fittings outside the foam pipe arranged between the connection fittings and the fixing fittings; and a connecting fitting having a contour larger than the outer diameter of the foam fitting. A holding metal fitting that is movably assembled to the plurality of mounting rods at a position near the fixing metal fitting between the fixing metal fittings, a surface of the connecting metal fitting facing the pressing metal fitting, and a surface of the pressing metal fitting facing the connecting metal fitting. Can be closely attached to the end of the foam tube A packing, a pipe connecting joint that is provided on the connecting fitting, and that communicates with the air passage in a state where the end of the foamed tube is in close contact with the packing provided on the connecting fitting, and the pressing fitting and the fixing fitting. A foam tube assembly for a foaming device, comprising: a spring provided between the springs and urging the pressing metal member toward the connection metal member. 2. The foamed pipe assembly for a foaming device according to claim 1, wherein the mounting rod is provided with a metal fitting that engages with the outer periphery of the foamed pipe to position the foamed pipe. 3. The foamed pipe is horizontally arranged, the receiving metal fitting is provided on a mounting rod located below the foaming pipe, and the receiving metal fitting has an upwardly open concave portion that engages with the outer circumference of the foaming pipe. The foamed tube assembly for a foaming device according to claim 1 or 2, wherein the foamed tube assembly is formed.