JPH03226369A - Nozzle for spraying flux - Google Patents

Abstract

PURPOSE:To stick a flux liquid in the form of a fine mist onto a printed circuit board by providing an ejection port for ejecting the flux liquid, an ultrasonic vibrator for forming the flux liquid into the mist form by ultrasonic waves and a supply opening to blow out air on a cylindrical body. CONSTITUTION:After a pump is driven, a solenoid valve is opened to eject the flux liquid 2 from the ejection port 28 of the nozzle 21. A supply pipe 23 and the ejection port 28 oscillate when an ultrasonic oscillator operates to oscillate the ultrasonic vibrator 30 and, therefore, the ultrasonic waves are radiated. On the other hand, the air pressurized by a fan is made into the spiral air by passing through grooves 27 of a partition plate 26 in the nozzle and this air is blown out of the supply opening 29. The flux liquid 2 ejected from the ejection port 28 is, therefore, made into the fine bubbles by the rising spiral air and the ultrasonic wave. Further, the air bubbles are ruptured and, therefore, the liquid flux is stuck in the mist form of fine particles to the printed circuit board. The circuit board is thus coated with the flux liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a flux spray nozzle that sprays a flux liquid in the form of a mist and applies it to a printed circuit board.

[Prior Art] Fig. 4 is a side sectional view showing an example of a conventional flux coating device, in which 1 is a flux tank, 2 is a flux liquid, 3 is a porous foaming tube, and 4 is the foaming tube. foamed flux formed by blowing pressurized air in 3, 5
6 is a nozzle formed in the upper part of the foaming tank 5, 7 is a printed circuit board, 8 is an electronic component, 9 is a lead wire, and 1o is the lead wire 9.
This is the insertion hole.

The conventional flux applicator is constructed as described above, and the pressurized air in the foaming tube 3 is blown into the flux tank 1, causing the flux liquid 2 to foam and become foamed flux 4, which rises and flows inside the nozzle 6. is applied to the printed circuit board 7. Further, since the foaming height of the foaming flux 4 is set high, the running of the printed circuit board 7 is not obstructed even if the lead wire 11 is long.

[Problems to be Solved by the Invention] In the conventional flux coating device, in order to maintain the foaming height of the foamed flux 4 at a high level, the foamed flux 4 is
The force of the fluid blowing out from the PC board becomes stronger and the amount of foaming increases, and therefore the amount of coating on the printed circuit board 7 also increases, causing the flux liquid 2 to flow from the periphery of the printed circuit board 7 to the top surface, or to cause the flux liquid 2 to flow from the insertion hole 10 of the printed circuit board 7 to the top surface. It oozes out,
There was a problem in that the flux liquid 2 adhered to the electronic components 8 on the upper surface of the printed circuit board 7 and had an adverse electrical effect on the electronic components 8.

Therefore, it is necessary to also clean the top surface of the printed circuit board 7, which means that a large amount of cleaning liquid is used, and a large amount of Freon (trade name of DuPont) liquid contained in the cleaning liquid is consumed. There were problems such as pollution caused by the regulated Freon liquid and increased costs due to the use of a large amount of cleaning liquid.In addition, if the amount of foamed flux 4 generated increases, the flux liquid 2 may oxidize and become oxidized in the air. There is a problem in that the amount of changes in components and specific gravity increases due to absorption of moisture, which increases the amount of effort required to manage the flux liquid 2.

There is also a method of spraying the flux liquid 2 with a conventionally used spray gun, but with this method, the particles of the flux liquid 2 that are ejected from the spray nozzle are large, and the large particles are scattered especially at the beginning of spraying, so it is difficult to print. Flux liquid 2 adheres unevenly to the substrate 7.
There was also a problem in that the amount of flux used was large, and that the flux liquid 2 adhered to the nozzle after spraying and blocked the nozzle.

In addition, a flux tank 1 storing a large amount of flux liquid 2 is installed.
There is also a method of attaching an ultrasonic oscillator to the bottom of the machine and emitting ultrasonic waves to generate atomized flux liquid 2, but this method has the problem that it takes time to atomize the flux liquid 2. Ta.

This invention was made in order to solve the above-mentioned problems, and the flux liquid jetted from the jet nozzle is atomized by ultrasonic waves generated by an ultrasonic vibrator and air blown from the jet nozzle around the nozzle. The purpose is to obtain a flux spray nozzle that sprays atomized flux liquid onto a printed circuit board.It also aims to create a flux spray nozzle in which the air blown out from the outlet is swirled to further atomize the flux liquid. An object of the present invention is to obtain a flux spraying nozzle which is capable of removing flux liquid adhering to the surface.

[Two means for solving the problem] The flux spraying nozzle according to the present invention has a cylindrical body,
A spout that spouts pressurized flux liquid, an ultrasonic vibrator that uses ultrasonic waves to atomize the flux liquid spouted from this spout, and a blower that blows pressurized air around the spout. It is equipped with an exit.

In addition, in order to make the air blown out from the outlet into a spiral shape, it is effective to provide a partition plate with a spiral groove on the outer circumferential surface inside the cylinder. Preferably, the spout is provided with means for removing the flux liquid.

[Operation] In the present invention, the pressurized flux liquid is turned into a fine mist by the ultrasonic waves generated from the ultrasonic vibrator and the pressurized air.

In addition, by blowing out the spiral air from the outlet,
The flux liquid rises in the form of a finer mist and adheres to the printed circuit board.

Further, by removing the flux liquid adhering to the ejection port of the nozzle, the ejection of the flux liquid from the ejection port is prevented from being obstructed.

[Example] Figure 1 (al, (b), Figure 2 (al ~ fdl)
, FIG. 3 shows an embodiment of the present invention, and FIG. 1 (al) and (bl) show how the nozzle of this invention is used, FIG. ) is shown in Figure 1 (
2(a) is a plan view showing an enlarged view of the nozzle in FIG. 1, and FIG.
A cross-sectional view taken along the line ■-■ of al, Figure 2 (cl, (
dl is a plan view and a side view showing the shape of the partition plate portion in FIG. 2(b), and FIG. 3 is a configuration diagram showing piping for cleaning liquid and pressurized air. In these figures, reference numeral 11 indicates the entire fluxer, reference numeral 12 indicates a conveyor chain on the fixed position side, and reference numeral 13 indicates a direction perpendicular to the traveling direction (arrow six directions) of the printed circuit board 7 according to the width of the printed circuit board 7. 12a is a holding claw of the transport chain 12 on the fixed position side, 13a is a holding claw of the movable transport chain 13, 14 is a chain guide on the fixed position side,
15 is a chain guide on the movable side; 16 is a hood on the fixed position side that is integrated with the chain guide 14 on the fixed position side; 17 is a hood on the movable side that is integrated with the chain guide 15 on the movable side; the hood 16 is a chain guide. 14, hood 17
is divided into upper and lower parts at the chain guide 15 to allow the printed circuit board 7 to run.

Reference numeral 18 denotes a recovery tank for recovering the excess sprayed flux liquid 2, and 19 denotes a duct for discharging the atomized flux liquid 2 scattered upward. 21 is a nozzle for atomizing the flux liquid 2; 22 is a cylindrical body of the nozzle 21;
3 is a supply pipe for supplying the flux liquid 2; 24 is a blower pipe for blowing out pressurized air; 25 is a lid for fixing the supply pipe 23 and the blower pipe 24 to close one side of the cylinder body 22; 26
is a partition plate that partitions the inside of said 22, and 27 is said partition plate 2.
A spiral groove is formed around the air pipe 6, and the pressurized air blown out from the blower pipe 24 is formed in a spiral shape. On the 2nd, reference numeral 29 indicates an outlet for discharging the flux liquid 2 ejected from the supply pipe 23; 29 indicates an outlet for discharging the air swirled in the groove 27; and 30 indicates an outlet for discharging the flux liquid 2 from the supply pipe 23.
The ultrasonic vibrator is fixed to the partition plate 26 and is provided inside the partition plate 26, and for example, a crystal vibrator is used. It is fixed integrally with the supply pipe 23. 31 is a cushioning gasket, 32 is a cable connected to the ultrasonic vibrator 30, 33 is an air nozzle that uses pressurized air to scatter the flux liquid 2 that has accumulated and adhered around the spout 28, and 34 is the nozzle. 33 is a blowing pipe; 35 is a storage tank for the flux liquid 2; 36 is a supply pipe for the flux liquid 2; 37 is a pump serving as a means for supplying the fluff liquid 2 to the nozzle 21;
3 is a blower as a means for supplying pressurized air to the nozzle 21; 39 is a solenoid valve that adjusts the flow rate of the flux liquid 2; 4o is an adjustment valve that adjusts the amount of air blown; 41 is the amount of air blown from the air nozzle 33. 42 is a first sensor that detects the printed circuit board 7 traveling in the direction of the arrow A; 43 is a second sensor that detects that the printed circuit board 7 travels on the fluxer 11; 44 is a The ultrasonic oscillator that operates the ultrasonic transducer 3o is one that generates, for example, an output of 8 W and a frequency of 58 KHz. 45 is a control device that operates the electromagnetic valves 39 and 41 based on the detection by the sensors 42 and 43.

Next, the operation will be explained.

First, after driving the blower 38 to pressurize air, the regulating valve 4o is opened to supply pressurized air to the nozzle 21. Arrow A
The printed circuit board 7 traveling in the direction is detected by the first sensor 42.
When detected, the electromagnetic valve 41 is opened by the operation of the control device 45, and the excess flux liquid 2 adhering to the jet 028 is removed by pressurized air blown out from the air nozzle 33.

After removing the flux liquid 2, the solenoid valve 41 is closed. Next, after the pump 37 is driven, the 1iFi1 valve 39 is opened and the flux liquid 2 is spouted from the spout 2 of the nozzle 21. At the same time, when the ultrasonic oscillator 44 is activated to vibrate the ultrasonic vibrator 3o, the supply pipe 23 and the jet nozzle 28 vibrate, so that ultrasonic waves are emitted. On the other hand, the air pressurized by the blower 38 is passed through the partition plate 2 inside the nozzle 21.
By passing through the groove 27 of 6, it becomes a spiral shape and exits the air outlet 29.
It blows out.

Therefore, the flux liquid 2 spouted from the jet 028 becomes fine bubbles due to the ultrasonic waves and the rising spiral air, and when these bubbles burst, it becomes a mist of fine particles that adhere to the printed circuit board 7. applied.

In addition, since the flux liquid 2 in the form of mist rises in the swirling air, it does not scatter around and does not contaminate surrounding equipment.

Next, when the printed circuit board 7 running on the fluxer 11 is detected by the second sensor 43 and the printed circuit board 7 has finished passing over the fluxer 11, the control device 45 is activated to stop the pump 37 and the solenoid valve is activated. 39 closes and the spraying of the flux liquid 2 ends, the ultrasonic oscillator 44 also stops.

Incidentally, when the spraying is finished, the flux liquid 2 remaining around the spout port 2 can be removed by opening the solenoid valve 41 again.

r Effects of the Invention] As explained above, the present invention includes a cylinder body having a spout for spouting a pressurized flux liquid, and an ultrasonic device for atomizing the flux liquid spouted from the spout using ultrasonic waves. Since a sonic vibrator and an outlet for blowing out pressurized air are provided around the outlet, the flux liquid becomes a finer mist due to the ultrasonic waves and is evenly attached to the printed circuit board, and This has the advantage of eliminating contamination of the printed circuit board due to leakage from the insertion hole of the printed circuit board to the upper surface, resulting in improved quality.

In addition, in order to make the air blown out from the outlet into a spiral shape, a partition plate with a spiral groove formed on the outer circumferential surface was installed inside the cylinder, so that the flux liquid was made even finer and not atomized. Since the resulting flux liquid rises in the swirling air, it does not scatter around, which has the advantage of preventing contamination of surrounding equipment and the environment.

Further, since the nozzle is provided with a means for removing the flux liquid adhering to the periphery of the nozzle, there is an advantage that the flux liquid adhering to the nozzle nozzle can be scattered and clogging due to the flux liquid can be prevented.

[Brief explanation of drawings]

Figure 1 (a), (b), Figure 2 (a) to (d),
FIG. 3 shows an embodiment of the present invention, and FIG.
l, (bl indicates the usage mode of the nozzle of this invention, FIG. 1(al is a plan view, FIG. 1(bl is FIG. 1(al
FIG. 2(a) is a plan view showing an enlarged view of the nozzle in FIG. 1, FIG.
A cross-sectional view taken along the n-n line of FIG. 2(C), (
d) is a plan view and a side view showing the shape of the partition plate portion of BL, FIG. 3 is a configuration diagram showing cleaning liquid and pressurized air piping, and FIG. 4 is an example of a conventional flux application device. In the figure, 2 is a flux liquid, 7 is a printed circuit board, 11 is a fluxer, 21 is a nozzle, 22 is a cylinder, 23 is a supply pipe, 2
4 is a blower pipe, 26 is a partition plate, 27 is a groove, 2nd is a spout,
29 is an air outlet, 30 is an ultrasonic vibrator, 33 is an air nozzle, 44 is an ultrasonic oscillator, and 45 is a control device. Fig. (a) 77I root @root] 1 Fluxer 2] Nozzle Fig. 1 Fig. (b) 7 lux liquid Fig. Fig. 5 IT7I '<'IP 碩r Fig.

Claims (3)

[Claims] (1) A cylindrical body has a spout that spouts pressurized flux liquid, an ultrasonic vibrator that uses ultrasonic waves to atomize the flux liquid spouted from this spout, and a cylindrical body that includes a spout around the spout. A flux spray nozzle characterized by being provided with an outlet for blowing out pressurized air. (2) The flux spraying device according to claim (1), wherein a partition plate having a spiral groove formed on the outer circumferential surface is provided inside the cylindrical body in order to make the air blown out from the outlet into a spiral shape. nozzle. (3) The flux spraying nozzle according to claim 1 or 2, wherein the ejection port is provided with means for removing flux liquid adhering to the periphery of the ejection port.