JPH0242384Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a flux coating device for applying flux to objects to be soldered, such as printed wiring boards.

(Prior Art and its Problems) The reason why flux is applied to an object to be soldered before soldering is to activate the object before soldering and to ensure good soldering.

If the flux does not have an accurate concentration value, good soldering cannot be ensured.

In particular, as soldering becomes more precise in recent years, flux concentration management is required to be more precise.

Here, since the specific gravity of the flux is greatly affected by temperature changes, the temperature of the flux also needs to be controlled at a constant temperature.

Incidentally, flux is a liquid mixture of a flux stock solution and a diluent (mainly alcohol).

However, most of the conventional flux applicators, like the flux applicators 1 and 1' in FIG. 1 or 2, simply detect the specific gravity of the flux 3 in the flux tank 2 with a sensor 4, The value signal is merely converted into a temperature-corrected specific gravity value based on the signal from the temperature sensor 5 similarly immersed in the flux 3, so that the flux 3 with an accurate concentration cannot be obtained.

6 is a liquid level sensor, and 7 is a flux 3 life sensor.

The flux coating apparatuses 1 and 1' shown in FIGS. 1 and 2 will be explained in detail below.

8 is a limiting circuit into which the upper and lower limits of specific gravity of the outputs of specific gravity sensor 4, temperature sensor 5, liquid level sensor 6 and life sensor 7 are input, and the input value of specific gravity sensor 4 is set to a certain value by the input value from temperature sensor 5. The temperature is corrected to the reference temperature and the corrected specific gravity is compared with the upper and lower limit set values. It has a display function that displays an output indicating whether or not the flux 3 should be replaced on a display section (not shown) in response to a signal.

9 and 10 are electromagnetic valves, 11 is a pump, 12 is a stock tank containing stock solution, 13 is a diluent tank containing a diluent (generally alcohol is used), 14, 1
5 is a supply pipe.

Note that the liquid level sensor 6 has three electrodes 6a, 6b, and 6c of different lengths, and the electrodes 6a, 6c,
The upper and lower limits of flux 3 are detected by the conduction between 6b and 6c.

Therefore, the control circuit 8 performs temperature correction of the specific gravity using the output values of the specific gravity sensor 4 and temperature sensor 5, and compares the temperature-corrected specific gravity with the upper and lower limit values. The output of the control circuit 8 operates the solenoid valve 10 and the pump 11 to supply the diluent in the diluent tank 13 to the flux tank 2, and when the flux is lower than the lower limit set value, the output of the control circuit 8 operates the solenoid valve 9 and the pump 11. The electromagnetic valve 9 and the pump 11 are controlled so that the stock solution in the stock solution tank 12 is supplied to the flux tank 2 by operating the stock solution tank 12 so that the flux 3 has a specific gravity within a predetermined range.

When the flux 3 reaches the lower limit liquid level, the liquid level sensor 6 outputs the lower limit value, and the solenoid valve 9, pump 11, and solenoid valve 10 are controlled by the control circuit 8 so that the specific gravity of the flux 3 falls within a predetermined range. and the pump 11 are operated alternately to supply the undiluted solution or diluted solution to the flux tank 2 until the flux 3 reaches the upper limit.
supply to.

In this way, the flux 3 under constant conditions is always supplied to the flux tank 2, and is applied to objects to be soldered, such as printed wiring boards, by a jet device (not shown).

Another conventional flux coating device 1' will be described below with reference to FIG. Furthermore, the first
Explanation of parts common to the figures will be omitted.

Referring to FIG. 2, 27 is a temperature correction circuit, 28
is a differential amplifier, 16 is a digital panel meter, 1
7 is an upper and lower limit specific gravity setting device, and 19 is a solenoid valve control circuit. A control circuit 8 is configured by these.

20 is a pressure air source, and 21 and 22 are pressure air supply pipes.

Therefore, the changeover switch 23 is set to the second position during automatic operation.
Turn it to the automatic side as shown in the diagram. Then, the temperature sensor 5 outputs an output according to the temperature, and a part of this output enters the temperature correction circuit 27, and based on the temperature determined by the temperature correction circuit 27, if it is 20°C or higher, for example, the difference necessary for temperature correction is calculated. The negative output is corrected to give a positive output if the temperature is below 20°C, and this output and the output corresponding to the specific gravity of the specific gravity sensor 4 are output to the differential amplifier 28 so as to be converted to 20°C.

The output of the differential amplifier 28 is compared with the upper and lower limit set values of the upper and lower limit setter 17 in the upper and lower limit specific gravity determination circuit 18 in terms of specific gravity values.

When the specific gravity value is high or low, an output is output from the upper and lower limit specific gravity determination circuit 18 to the solenoid valve control circuit 19, which controls the solenoid valve 9 or 10 to supply pressurized air A from the pressurized air source 20. Outputs the output to be supplied to the pipes 21 and 22, and pressurized air A
is supplied to a stock solution tank 12 containing a flux stock solution 24 or a dilution solution tank 13 containing a dilution solution 25.

Therefore, the stock solution tank 12 or diluted solution tank 13 is removed by an amount proportional to the time that the solenoid valve 9 or 10 is open.
The stock solution 24 or diluted solution 25 is transferred to the flux tank 2.
is supplied to maintain the specific gravity of flux 3 within a predetermined range.

Incidentally, when the liquid level sensor 6 outputs the upper limit liquid level of the flux 3, the solenoid valve 9 or 10 is immediately closed. Also, when the liquid level sensor 6 outputs the lower limit liquid level of the flux 3, the stock solution 24 or the diluted liquid 25 is pumped into the flux tank 2 while keeping the specific gravity within a predetermined range until the liquid level outputs the upper limit value, which is the upper limit liquid level. supply to.

The conventional flux coating devices 1 and 1' described above are as follows:
Flux 3 can always be maintained at a certain level of specific gravity.

However, as mentioned above, in the conventional flux applicator 1, 1', the measured specific gravity value signal is simply corrected to a predetermined temperature value, and in reality, the flux 3 used is at a predetermined temperature. Since the temperature (specific gravity) of the flux 3 was not corrected, it was not possible to obtain a flux 3 with an accurate temperature (specific gravity), so there was a drawback that highly accurate soldering could not be performed.

That is, although it is well known that the temperature of the flux 3 has a large influence on the defect rate, which represents the ratio of soldering quality, the conventional flux applicators 1 and 1' Currently, there is little consideration given to constant temperature control measures.

Regarding the flux applicators 1 and 1' shown in FIGS. 1 and 2, although not shown, as shown in FIG. It is equipped with a flux jet device for forming the flux into a foam, guiding it upward through a foam tube cover 30, flattening it through a foam nozzle 31, and applying the flux to an object to be soldered such as a printed wiring board to be soldered. ing.

Another conventional flux coating device 1'' is disclosed in Japanese Patent Application Laid-open No. 72755/1983.

This flux coating device 1'' will be explained below with reference to FIG.

This flux applicator 1'' has a temperature sensor 5 such as a thermocouple or thermistor placed in a flux tank 2, and a signal from this temperature sensor 5 is applied to a temperature control device, and a set temperature value signal from a temperature setting device 33 is input. The signal from the temperature sensor 5 is compared, and the heat exchange device 34 is operated to raise or lower the temperature of the flux 3 in the flux tank 2, so that the flux 3 reaches a predetermined temperature.
In addition, in FIG. 3, the reference numeral 32 indicates a temperature control device.

This flux applicator 1'' applies flux 3
It is certainly useful because it keeps its temperature constant.

For this reason, although it has been put into practical use, this flux applicator 1'' merely keeps the temperature of the flux 3 constant and does not measure the actual specific gravity of the flux 3. Since the temperature value cannot be maintained, high precision soldering cannot be expected.

Further, according to the flux coating device 1'', when using this device 1'', even if the temperature control circuit 33 is turned on and the temperature sensor 5 is activated, heat exchange is performed based on the signal from the temperature sensor 5. device 34
Even if the flux 3 is activated, the completely cold flux 3 cannot be raised to the predetermined temperature instantaneously, resulting in very poor response operation, and for a long time until the flux 3 reaches the predetermined temperature. It had a defect that made it unusable.

Furthermore, if the temperature of the flux 3 is changing and, for example, the specific gravity of the flux 3 is corrected or the liquid level is controlled by supplying a flux undiluted solution or a diluted solution into the flux tank 2, the temperature of the flux 3 will change. However, it takes a long time for Flux 3 to reach the predetermined temperature value, and during that time, Flux 3 with a significantly deviated specific gravity value must be used, making it difficult to perform high-precision soldering. There is a drawback that it cannot be done.

In addition, in the flux coating device 1'' (the above-mentioned flux coating devices 1 and 1' are also similar), the flux tank 2 generally contains 5 to 10 liters of flux 3.
Since the flux tank 2 is large in size and has a storage capacity of The disadvantage is that it requires a large heater and cooler), is very inefficient, and is very expensive.

Furthermore, if such a large-sized flux applicator 1'' is installed in a ready-made automatic soldering device, there is no flexibility in arranging the flux applicator 1'' itself in terms of space. The installation structure of the flux coating device 1'' is extremely complicated, resulting in poor compatibility, and the automatic soldering device equipped with the flux coating device 1'' is large and expensive.

As mentioned above, this flux applicator 1'' does not detect the specific gravity of the flux 3, etc. unlike the flux applicators 1 and 1' shown in FIGS. 1 and 2, but simply detects the specific gravity of the flux 3. Since the temperature is only kept constant, this method alone has the drawback that the accurate concentration of flux 3 cannot be detected.

This is because Flux 3 uses an alcohol-based diluted liquid, so when it is heated, the alcohol in it evaporates or absorbs moisture from the atmosphere, which causes its specific gravity to fluctuate greatly, making it difficult to actually use it. Since this means that flux 3 mixed with water is being warmed, it is not possible to maintain the desired temperature in order to keep the specific gravity of flux 3 constant.
It has the disadvantage that the flux 3 cannot be maintained at a constant specific gravity value. In addition, when impurities are mixed into the flux 3, the specific gravity value of the flux 3 changes, but in the case of the flux coating device 1'',
These drawbacks could not be addressed, and as a result, the flux 3 could not be maintained at a constant specific gravity value, resulting in the drawback that accurate soldering could not be expected.

(Purpose of the present invention) The present invention has been made in order to solve the drawbacks and problems of the above-mentioned prior art. , 1', the specific gravity of the flux 3 is detected using the specific gravity sensor 4, and the detected specific gravity value signal is temperature-corrected by the temperature signal from the temperature sensor 5 immersed in the flux 3. As in the above-mentioned flux coating device 1'', the temperature of the flux 3 is detected using the temperature sensor 5, and the operation of the heat exchange device 34 is controlled based on the detected temperature signal of the flux 3 to simply maintain the flux 3 at a constant level. There is a known method of managing flux 3 to a predetermined specific gravity value simply by maintaining the temperature, and by simply using one of the above methods, flux 3 could be managed to a predetermined specific gravity value. However, as a result of pursuing these methods, it was found that due to the various drawbacks mentioned above, it was not possible to control the flux 3 to an accurate specific gravity value, and as a result, it was not possible to perform soldering with high accuracy. There was found.

Here, in order to keep the specific gravity of the flux 3 constant, the present invention separates a large flux tank from a flux application section having a flux jet device to maintain a small flux application section. In other words, it is sufficient to raise or lower the temperature of only a small amount of flux in the foaming nozzle, and a heat exchange device that is small and can be expected to have an energy-saving effect can be used.
The object of this invention is to make it possible to obtain an economical flux coating device.

In addition, by doing the above, it is possible to maintain the set temperature by increasing or decreasing only the temperature of a small amount of flux in a small foaming nozzle that is separated from the large flux tank.
Even if the specific gravity of the flux in the flux tank fluctuates or the liquid level decreases, and supplying the flux undiluted solution or diluted solution causes a temperature change of the flux, causing a fluctuation in specific gravity, the flux in the foaming nozzle will Since the amount is small, the flux in the foaming nozzle immediately before use can be immediately adjusted and maintained at a predetermined temperature, so that highly quality-controlled soldering can be expected without causing variations in soldering characteristics. It was made for the purpose of

In addition, by using a flux applicator that has a foaming nozzle that is separate from the flux tank, only certain parts of the device, such as the foaming nozzle part, can be installed in the automatic soldering equipment, and the large flux tank can be separated and applied to other parts. The purpose of this invention is to enable a flux applicator having a constant temperature control device to be freely and easily installed in an automatic soldering device.

In addition, by separating the flux tank and the foaming nozzle, it is possible to use existing automatic soldering equipment as is by simply attaching a mechanism such as a foaming nozzle with a constant temperature control device, making it easier to maintain the temperature of the flux. The purpose of this design was to make it possible to maintain flux at an accurate concentration at all times, and to achieve good soldering.

In addition, by making it necessary to control only a small amount of flux at a constant temperature, it is possible to always accurately set the flux to a constant specific gravity value even after the power is turned on and during flux application when using the flux application equipment. The purpose of this invention is to provide a flux applicator that allows soldering to be performed with high controllability and extremely high accuracy.

(Means for achieving the purpose of the invention) The purpose of the present invention is to achieve the following components (a) to (f).
This can be achieved by providing a flux coating device configured as follows.

(a) It shall be equipped with a flux tank for storing flux consisting of diluent and flux concentrate.

(b) It is provided with a foaming nozzle which is arranged separately from the flux tank and has a foaming tube for causing the flux in the flux tank to be jetted through the flux supplied through the flux supply passage.

(c) It is equipped with means for actively supplying the flux in the flux tank to the foaming nozzle.

(d) A flux specific gravity control device shall be installed to manage the specific gravity of the above flux.

(e) It shall be equipped with a means to detect the temperature of the above flux.

(f) A constant temperature that maintains the flux in the foaming nozzle at a set temperature by raising or lowering the flux discharged from the flux tank to a set temperature in response to a temperature value signal from the means for detecting the temperature of the flux. A control device shall be installed.

(Example) An example of the present invention will be described with reference to FIG. 4 and the following drawings.

The flux applicator 1 of the present invention is characterized in that the flux tank 2' storing the flux 3 and the flux applicator 35 are separated.

The flux tank 2' is connected to the stock solution tank 12 and the diluted solution tank 13 via a supply pipe 38 which is provided with a flux stock solution supply pump 36 and a diluent supply pump 37 in the middle.
It is connected to the.

The pumps 37 and 38 are driven and controlled by signals from a control circuit 39, and pump the flux undiluted solution 24 in the undiluted solution tank 12 and/or the diluted liquid 25 in the diluted solution tank 13.
is supplied into the flux tank 2' through the supply pipe 38, and the liquid level and specific gravity of the flux 3 in the flux tank 2' are kept constant.

A bob 41 connected to the specific gravity sensor 4 via the transmission line 40 is immersed in the flux 3 of the flux tank 2'.

In addition, the flux 3 in the flux tank 2' is
The above-described liquid level sensor 6 for detecting the liquid level of the flux 3 has an electrode portion 6A at its tip immersed.

Furthermore, the flux 3 in the flux tank 2'
A temperature sensor 5 for detecting the temperature is immersed in the flux 3.

The flux tank 2' may be installed in the automatic soldering device or removed from the automatic soldering device, but in this invention, in order to make the automatic soldering device compact, in this example, the flux tank 2' is installed in the automatic soldering device. is disposed at a position removed from the automatic soldering device, and only the flux application section 35 is installed in the automatic soldering device.

The flux tank 2' is connected to a foaming nozzle 46 through a flux supply pipe 44 having a flux supply pump 42 and an electromagnetic valve 43 disposed therebetween, and a supply pipe 45 connected to the flux supply pipe 44.

The foaming nozzle 46 has an opening 47 at its upper end, a flux storage cavity 48 for storing a small amount of flux 3 inside, and a flux storage cavity 48 at the bottom of the cavity 48 for turning the flux 3 into a foam. A foam cylinder 49 is provided.

This foam tube 49 is connected to an air pump 51 via an air supply pipe 50.

Therefore, when the air pump 51 is driven, air passes through the air supply pipe 50 and air is generated from the foaming tube 49, so that the foamed air-like flux 52 made into a foam by the foaming tube 49 is foamed. It is ejected from the upper part of the opening 47 of the nozzle 46 and applied to the object to be soldered.

The foaming nozzle 46 is provided with a temperature sensor 53 for detecting the temperature of the flux 3 inside the foaming nozzle 46, that is, inside the cavity 48.

This temperature sensor 53 can detect the temperature of the flux 3 in the foaming nozzle 46 just before it is applied to the object to be soldered.
By driving and controlling a constant temperature controller 54 of the flux 3 (to be described later) based on a signal from the foaming nozzle 3 by the control circuit 39, the temperature inside the foaming nozzle 46 can be set to the set temperature.

That is, since the foamed air-like flux 52 has a set temperature, it is possible to apply the flux 3 at an accurate concentration to the object to be soldered, thereby facilitating accurate soldering.

Note that the foaming nozzle 46 also needs to contain the flux 3 so that the liquid level is always constant, so the foaming nozzle 46 is equipped with a liquid level sensor 5.
5 is provided.

The signal from the liquid level sensor 55 is input to the control circuit 39, and the flux supply pump 42 and the electromagnetic valve 43 are controlled to drive and control the flux 3 in the flux tank 2' until the liquid level of the flux 3 in the foaming nozzle 46 becomes constant. is supplied to the foaming nozzle 46. The foaming nozzle 46 is surrounded by a heat insulating cover 67.

Inside the constant temperature temperature controller 54, the supply pipe 4
A heater 56 for heating the flux 3 from the outside is wound around the outer circumference of the flux 3, as shown in FIG.

The reason for this is that since the flux 3 is an organic solvent, it is dangerous to heat the flux 3 directly within the foaming nozzle 46. Further, the end of a cooling pipe 58 connected to a cooler 57 is wound around the outer periphery of the supply pipe 45 as shown in FIG. 5, so that the flux 3 is cooled from the outside of the supply pipe 45. .

FIG. 6 shows the main system block diagram of the present invention.

The signal from the liquid level sensor 55 is input to the liquid level up/down determination circuit 59, and the flux supply pump 4 is operated by the flux supply circuit 60 until the flux 3 in the foaming nozzle 46 reaches a certain level.
2 and the electromagnetic valve 43 to supply the flux 3 in the flux tank 2' to the foaming nozzle 46 through the flux supply pipe 44 and the supply pipe 45.

When the drive switch 61 is turned on when the flux applicator 1 is in use, the air pump drive circuit 62 causes air to flow through the air supply pipe 50 and the foam tube 49, and the foamed air-like flux 52 is ejected from the opening 47, and the soldered object is heated. is applied to.

Based on the output signal from the temperature sensor 53, the temperature determination circuit 67 controls the operation of the constant temperature temperature control device 54.

The specific gravity value signal from the specific gravity sensor 4 is input to the specific gravity determination circuit 63 and then sent to the specific gravity temperature correction circuit 64.
The specific gravity signal is corrected to match the temperature signal inputted to the temperature determining circuit 65 and converted to the set temperature. Note that the signal from the specific gravity sensor 4 is input to the specific gravity determination circuit 63.

In order to maintain the flux 3 in the flux tank 2' at a predetermined specific gravity value, the stock solution supply pump 36 or the diluent supply pump 37 is driven by a signal from the correction circuit 64, and an appropriate amount of the stock solution in the stock solution tank 12 is pumped. 24 or the diluent 25 in the diluent tank 13 is supplied into the flux tank 2' via the supply pipe 38.

The signal from the liquid level sensor 6 is sent to the liquid level judgment circuit 6.
6 and pump 36 or 3 until the flux 3 in the flux tank 2' reaches a certain level.
7 to drive flux 3 into flux tank 2'.
supply.

(Effects of the present invention) In order to keep the specific gravity of the flux constant, the present invention can maintain the temperature at the set temperature by increasing or decreasing only the temperature of the flux in the small foaming nozzle that is separated from the large flux tank. Therefore, it is possible to use a heat exchange device that is small and can be expected to have an energy saving effect, which has the effect of making it possible to obtain an economical flux coating device.

In addition, with this invention, it is only necessary to raise or lower the temperature of a small amount of flux in a small foaming nozzle, which is separated from the large flux tank, and maintain it at the set temperature. Even if the temperature of the flux changes and the specific gravity changes due to the supply of flux undiluted solution or diluted solution, since the flux in the foaming nozzle is small, Since the flux inside the foaming nozzle can be immediately adjusted and maintained at a predetermined temperature, soldering with highly controlled quality can be expected without variations in soldering characteristics.

In addition, by using a flux applicator with a structure that has a foaming nozzle that is separate from the flux tank, only the predetermined parts of the device such as the flux application part, that is, the foaming nozzle part, can be installed in the automatic soldering equipment, and the large flux tank can be separated. Therefore, a flux applicator having a constant temperature control device can be disposed in an automatic soldering device with freedom and leeway.

In addition, since the flux tank and the foaming nozzle are separated, conventional off-the-shelf automatic soldering equipment can be used as is by simply installing a mechanism such as a foaming nozzle with a constant temperature control device, making it possible to maintain a constant temperature of the flux. Since the flux can always be maintained at an accurate concentration, it has the effect of ensuring good soldering.

Further, according to the present invention, a means for detecting the temperature of the flux is provided, and a means for correcting the flux to a specific gravity value at a set temperature and a constant temperature control device are operated based on a signal from the temperature detecting means. Since the flux is kept at a constant specific gravity value, when using the flux applicator, when operating the constant temperature control device to maintain the flux at a constant specific gravity value, the flux is kept at a constant temperature value. Even if the flux decreases and the flux undiluted solution or diluted solution is supplied, and the temperature changes and the specific gravity value fluctuates, the specific gravity value of the flux detected by the specific gravity sensor can be read from the temperature sensor. Since the specific gravity value is temperature-corrected using the signal, the flux can be controlled to a predetermined specific gravity value with relatively good accuracy, and good soldering can be performed.

Furthermore, even if the constant temperature control device is operated to maintain the flux at a predetermined temperature value,
Evaporation of alcohol in the flux as described above,
Even if the specific gravity value or temperature of the flux changes due to the contamination of water or impurities, the specific gravity value of the flux at that time is detected by the specific gravity sensor, and the temperature value of the flux is detected by the temperature sensor. Since the detected flux specific gravity value signal can be temperature-corrected to perform accurate flux specific gravity value management with few errors, it is possible to perform soldering with high precision.

Moreover, in this case, it is possible to maintain the flux at the optimum temperature by controlling the constant temperature controller by considering the measured specific gravity value signal of the flux.
It is now possible to maintain the flux at a desired specific gravity value with extremely high accuracy compared to the conventional method, and highly accurate soldering can be performed.

In addition, in the above embodiment, the case is shown in which the flux is heated or cooled from outside the supply pipe that supplies the flux to the foaming nozzle.
The flux may be heated and cooled from outside the foaming nozzle containing the flux.

Further, in the embodiment, a case is shown in which two temperature sensors are used, but it is also possible to use just one of the temperature sensors. For example, if the temperature sensor 53 is omitted and the temperature sensor 5 is shared, the temperature The signal from the sensor 5 is sent to the temperature judgment circuit 6
It is only necessary to output it to 5 and 67. but,
Knowing the temperature information of the flux immediately before foaming allows the flux to be set to a desired specific gravity value, so the two temperature sensors 5 and 53 are used to send the signals from each temperature sensor 5 and 53 to the temperature determination circuit as described above. It is desirable to output the data to 65 and 67.

[Brief explanation of the drawing]

FIGS. 1 to 3 are explanatory diagrams of flux coating apparatuses shown as different examples of conventional ones, FIG. 4 is an explanatory diagram of the flux coating apparatus of the present invention, and FIG. 5 is a constant temperature control device of the same flux coating apparatus. FIG. 6 is an explanatory diagram of the control system of the flux coating device. Explanation of symbols: 1, 1', 1'', 1...flux coating device, 2, 2'...flux tank, 3...
Flux, 4... Specific gravity sensor, 5... Temperature sensor, 6... Liquid level sensor, 7... Life sensor, 8... Control circuit, 9, 10... Solenoid valve, 1
1... Pump, 12... Stock solution tank, 13... Diluted liquid tank, 14, 15... Supply pipe, 16... Digital panel meter, 17... Upper, lower limit specific gravity setting device, 18... Upper, lower limit specific gravity Judgment circuit, 19... Solenoid valve control circuit, 20... Pressure air source, 21, 2
2... Pressure air supply pipe, 23... Selector switch, 24... Flux stock solution, 25... Diluent, 26... Air source, 27... Temperature correction circuit, 2
8... Differential amplifier, 29... Foam tube, 30... Foam tube cover, 31... Foaming nozzle, 32... Temperature control device, 33... Temperature setting device, 34... Heat exchange device, 35... Flux application section, 36... Flux stock solution supply pump, 37... Diluent supply pump, 38... Supply pipe, 39... Control circuit, 4
0... Transmission line, 41... Bob, 42... Flux supply pump, 43... Solenoid valve, 44... Flux supply pipe, 45... Supply pipe, 46... Foaming nozzle, 47... Opening, 48... ...Flux storage cavity, 49... Foam tube, 50... Air supply pipe, 51... Air pump, 52... Foamed air-like flux, 53... Temperature sensor, 54...
Constant temperature temperature controller, 55...Liquid level sensor, 56...
Heater, 57... Cooler, 58... Cooling pipe, 59... Liquid level up/down determination circuit, 60... Flux supply circuit, 61... Drive switch, 62...
Air pump drive circuit, 63...specific gravity determination circuit,
64... Specific gravity temperature correction circuit, 65... Temperature judgment circuit, 66... Liquid level judgment circuit, 67... Heat insulation cover.

Claims (1)

[Scope of Claims for Utility Model Registration] (1) A flux coating device constituted by the following components (a) to (f). (a) It shall be equipped with a flux tank for storing flux consisting of diluent and flux concentrate. (b) It is provided with a foaming nozzle which is arranged separately from the flux tank and has a foaming tube for causing the flux in the flux tank to be jetted through the flux supplied through the flux supply passage. (c) A means is provided to actively supply the flux in the flux tank to the foaming nozzle. (d) A flux specific gravity control device shall be installed to manage the specific gravity of the above flux. (e) It shall be equipped with a means to detect the temperature of the above flux. (f) A constant temperature that maintains the flux in the foaming nozzle at a set temperature by raising or lowering the flux discharged from the flux tank to a set temperature in response to a temperature value signal from the means for detecting the temperature of the flux. A control device shall be installed. (2) The above-mentioned flux specific gravity control device is provided with means for correcting the specific gravity value of the flux obtained by the means for detecting the specific gravity of the flux to a specific gravity value at a set temperature, and Claims for registration of a utility model characterized in that the flux is maintained at a constant specific gravity value by operating means for correcting the flux to a specific gravity value at a set temperature based on a signal from the above and the constant temperature control device. The flux coating device according to item (1). (3) Utility model registration claim No. (1) characterized in that the foaming nozzle is equipped with a device for detecting whether or not flux is supplied to the foaming nozzle.
Flux coating device as described in paragraph or paragraph (2). (4) The foaming nozzle is characterized in that it is equipped with a temperature sensor for detecting the temperature of the flux supplied thereto. The flux coating device described in the above. (5) The constant temperature temperature control device is characterized in that the operation of the flux in the foaming nozzle is controlled to a set temperature based on a temperature value signal of the flux from a temperature sensor provided in the foaming nozzle. Claims for Utility Model Registration Paragraphs (1) to 1.
The flux coating device according to any one of paragraph (4). (6) The above-mentioned constant temperature temperature control device comprises a device for heating and a device for cooling the flux delivered from the flux tank, as claimed in claims (1) to (5). ) The flux coating device according to any one of the above items. (7) The flux coating device according to claim (6), wherein the device for heating the flux is configured to heat the flux supply passage itself from its outer periphery. (8) The flux coating device according to claim (6), wherein the device for cooling the flux is configured to cool the flux supply passage itself from its outer periphery. (9) The means for detecting the temperature of the flux supplied to the foaming nozzle shall include, in addition to the temperature sensor provided in the foaming nozzle, means for correcting the flux in the flux tank to a specific gravity value at a set temperature. A flux coating device according to any one of claims (1) to (8) of the claims registered as a utility model, characterized in that: (10) The scope of the utility model registration claim, characterized in that the means for actively supplying the flux in the flux tank to the foaming nozzle is a means for allowing the flux in the flux tank to be supplied to the foaming nozzle. The flux coating device according to item (1). (11) The flux coating according to claim (10) of the utility model registration claim, characterized in that the permitting means comprises a supply pump and an electromagnetic valve for supplying the flux in the flux tank to the foaming nozzle. Device.