JPH0820434B2 - Flux acid value automatic measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application of the Invention] The present invention relates to an automatic flux acid value measuring device for measuring the acid value of a soldering flux used in electronic equipment, communication equipment, measuring instruments, and the like. Regarding The definition of "acid value" of flux will be described later.

[Prior art and its problems] Applying flux before soldering an electronic component or the like to an object to be soldered such as a printed wiring board ensures activation before soldering and ensures good soldering. This is because

If the flux does not have an accurate specific gravity value [≈concentration value], good soldering cannot be secured.

In particular, the flux for soldering used in electronic devices and the like, by its nature, cannot maintain soldering of a constant quality unless it is kept at a specific gravity value.

For this reason, in the past, in order to keep the specific gravity of the flux constant, a hydrometer or a specific gravity automatic adjusting device [measured the change in the specific gravity value of the flux and supplying an appropriate amount of flux or alcohol solvent until a constant specific gravity value was obtained. The method of controlling the specific gravity value of the flux has been adopted by using a device that keeps the flux [fluxer] at a constant specific gravity value.

The flux is composed of a mixed liquid of flux and alcohol solvent.

In recent years, as the tendency of high-density mounting on printed wiring boards has progressed remarkably, the degree of adhesion of flux to printed wiring boards has been reduced in order to prevent corrosion and damage to electrical components. It has come to be demanded that a low residue tendency.

That is, according to the conventional flux density management method,
If it is used as it is, a high-concentration flux (compared to the flux concentration that tends to be a low residue) is applied to the printed wiring board, so it was necessary to perform CFC cleaning.

For this reason, the flux is becoming more and more rosin-reducing, where a low residue can be expected so that cleaning can be completed.

For example, in the past, the solid content of flux was 20
It was around 30%, but recently it has reached the 10% range.
It is expected that such a tendency of low residue of flux will further progress in the future for various reasons described above.

As described above, when the solid content of the flux decreases, the flux concentration value decreases, making it difficult to control the flux concentration, which tends to reduce rosin, and simply detect changes in the specific gravity of the flux. With the flux density adjusting device, it is no longer possible to maintain the flux concentration accurately and constant, and it has become difficult to perform more accurate soldering quality control.

[Problem to be Solved by the Invention] It is an object of the present invention to provide a novel apparatus that uses chemical means instead of the conventional physical method represented by specific gravity measurement that is managed by the physical concept of specific gravity. By making it possible to carry out a completely new concept such as neutralization titration by a chemical method that matches the characteristics of the flux, even if the flux has an extremely low concentration value, the concentration can be extremely easily and accurately determined. The challenge was to provide a manageable means.

Further, in adopting the chemical means for achieving the above-mentioned object, it is also an object to make available the reagent used for the concentration measurement as inexpensively as possible and easily available.

Furthermore, by applying the present invention to a conventional flux specific gravity automatic adjusting apparatus by a physical method, the conventional flux specific gravity automatic adjusting apparatus can accurately adjust a flux of a low concentration value to a constant specific gravity value. The challenge was to make it manageable.

 Other issues will be clarified in the following explanation.

[Means for Achieving the Object of the Invention] The object of the present invention is to provide an alcohol solvent tank containing an alcohol solvent, an indicator tank containing an indicator, a titration standard solution tank containing a titration standard solution, a flux to be measured, A reaction tank for containing an alcohol solvent, an indicator and a titration standard solution, and a controller for the alcohol solvent, the indicator and the titration standard solution respectively between the reaction tank and the respective alcohol solvent tank, the indicator tank and the titration standard solution tank. Means for supplying an appropriate amount in an appropriate order in accordance with a signal from the controller, and an appropriate amount of an alcohol solvent, an indicator, and a titration standard solution are sequentially supplied to the reaction tank in response to a signal from the controller, thereby performing the measurement. Agitating means for reacting the flux with the titration standard solution, and a signal from the controller for the reaction tank A means for detecting the neutralization end point where the flux to be measured reacts with the titration application solution to supply a color change by sequentially supplying an appropriate amount using a call solvent, an indicator and a titration standard solution, and a titration pump, etc. The relationship between the titration standard liquid amount and the acid value should be input in advance by the electric signal from the titration standard liquid amount supply means and the electric signal obtained from the neutralization end point detecting means. Then, it can be achieved by providing an apparatus for automatically measuring the acid value of flux, which comprises a circuit for calculating the amount of titration standard solution supplied until reaching the neutralization end point as the acid value of flux.

Other problems can be achieved by providing a flux stock solution tank containing a stock flux solution and an automatic flux acid value measuring device provided with an acid value adjusting device for the flux to be measured.

Still another problem is that the circuit for calculating the titration standard solution amount supplied until the neutralization end point as the acid value of the flux also detects the supplied measured flux, alcohol solvent and indicator supply amount. To detect the acid value of the flux, and to provide a water tank containing water as an auxiliary means for dissolving white turbidity and precipitates produced by the reaction of the measured flux with the titration standard solution. Can be achieved by

[Definition] The "acid value" used in the present invention is defined as a prescribed concentration of a titration standard solution capable of neutralizing a constant amount of flux to be measured with an equivalent amount at 20 ° C, and the unit is N.
It shall be represented by [normal].

[Embodiment of the Invention] [First Embodiment of the Invention] FIG. 1 is an explanatory view of a system of an automatic flux acid value measuring apparatus 1 according to the first embodiment of the present invention. The first embodiment will be described.

The reaction tank 2 having a sufficient capacity to store the test liquid 4 composed of a mixture of liquids described later and having an open upper end formed by an appropriate member is used to detect the acid value of the flux in the embodiment of the present invention. Since the optical detecting means [absorbance measuring device] described later is adopted as an example, the transparent windows 3a and 3b are formed at the two positions of the reaction tank symmetrical with 180 degrees.
When the reaction tank 2 is formed of a transparent material such as transparent glass, it is not necessary to form the transparent windows 3a and 3b.

The reaction tank 2 is filled with a test liquid 4 supplied by a means described later, and the test liquid 4 is constantly stirred by a stirring blade 5 driven by an external motor 6.

A waste liquid pipe 7 communicating with a solenoid valve 8 used as a waste liquid treatment mechanism is provided below the reaction tank 2, and the solenoid valve 8 is opened by a signal from an I / O (input / output) circuit 17. Then, the test liquid 4 in the reaction tank 2 is discharged to the outside through the waste liquid pipe 7.

Titration standard solution container 10 constituting a titration standard solution tank, measured flux container 11 constituting a measured flux tank, alcohol solvent container 1 constituting an alcohol diluent tank
2. The indicator container 13 constituting the indicator tank is installed above the reaction tank 2.

The titration standard solution container 10 is opened by a solenoid valve drive instruction data signal from the I / O circuit 9 and is supplied from a supply pipe 15 through a solenoid valve 14 used as a standard solution supply control mechanism. 16 are supplied as needed.

As the titration standard solution 16, it is desirable to use an aqueous solution reagent that can be obtained extremely easily and inexpensively. For example, a 0.1 N sodium hydroxide aqueous solution is used.

The titration standard solution 16 in the standard solution container 10 is actuated by the titration pump drive instruction data signal from the I / O circuit 9 to operate the titration pump 18 used as a standard solution supply control mechanism, and the titration standard solution is fed via the titration pipe 19. By dropping the solution 16, the titration standard solution 16 is titrated and supplied into the reaction tank 2.

The measured flux container 11 stores a predetermined amount of measured flux 20 in advance.

This measured flux 20 becomes the liquid to be measured as described later.

The measured flux 20 in the measured flux container 11 is
By operating the titration pump 21 used as the measured flux supply control mechanism driven by the titration pump drive instruction data signal from the / O circuit 9, the measured flux 20 is dropped through the drip pipe 22, and thus the reaction tank 2 An appropriate amount of the flux 20 to be measured is titrated therein.

It is convenient to use the flux container 11 to be measured whose top end [in the drawing] is open as shown in FIG. 1, and the device 1 should be tightly plugged when not in use. Further, the flux container 11 to be measured uses the upper end opening portion thereof,
The flux 20 to be measured may be configured to be supplied in an appropriate amount therein by using an appropriate means.

Supply pipe through the solenoid valve 24 used as an alcohol solvent supply control mechanism driven by the solenoid valve drive instruction data signal from the I / O circuit 9 in the alcohol solvent container 12
The alcohol solvent 23 having a constant concentration is appropriately supplied from the 25 side. As an alcohol solvent,
For example, it is convenient to use readily available isopropyl alcohol or the like.

The alcohol solvent 23 in the alcohol solvent container 12 is
The titration pump 26 used as an alcohol-based solvent supply control mechanism driven by the titration pump drive instruction data signal from the / O circuit 9 supplies an appropriate amount of the alcohol-based solvent 23 into the reaction tank 2 through the dropping pipe 27. I am trying to do it.

Further, in the indicator container 13, an indicator 32 having a constant concentration is supplied from the side of the supply pipe 29 to the I / O circuit via the solenoid valve 28 used as an indicator supply control mechanism driven by the solenoid valve drive instruction data signal from the I / O circuit 9. By the operation of the titration pump 30 used as the indicator supply control mechanism driven by the titration pump drive instruction data signal from 9, the indicator 32 is appropriately titrated and supplied into the reaction tank 2 via the dropping pipe 31.

The solenoid valves 14, 24 and 28 are controlled by a signal from the I / O circuit 9 to open when the titration pumps 18, 26 and 30 operate.

Therefore, when the titration pumps 18, 26 and 30 are operated, the titration standard solution container 10 and the alcohol solvent container 12 are previously prepared.
It is necessary that the titration standard solution 16, the alcohol solvent 23, and the indicator 32 be filled in the container and the indicator container 13 in appropriate amounts. Of course, in this case, the measured flux container 11 also needs to be filled with a certain amount of the measured flux 20.

In the case shown in FIG. 1, the amount of the measured flux 20 remaining in the measured flux container 11 is unknown. In this case, therefore, the measured flux 20 remains in the measured flux container 11 by appropriate means. It is convenient to detect the amount and display or warn the remaining amount.

Also, the titration standard solution container 10 and the alcohol solvent container 1
2 and the indicator container 13 are I / O when the device 1 is not driven.
The solenoid valves 14, 24 and 28 are closed by a signal from the O circuit 9, and the standard liquid container 10 and the alcohol solvent container 12 are
And the indicator container 13 is tightly closed.

The solenoid valves 14, 24 and 28 are used for the titration standard solution container 10,
When the titration pumps 18, 26 and 30 respectively corresponding to the alcohol solvent container 12 and the indicator container 13 are operated by the signal from the I / O circuit 9, the titration pumps are also configured to open by the signal from the I / O circuit 9. There is.

A photoconductive conversion element 33 serving as a light receiving sensor is arranged facing the transparent window 3b formed in the reaction tank 2, and a condenser lens 34 is arranged facing the transparent window 3a, and the back part of the condenser lens 34 is arranged. A light source 36 such as an incandescent lamp is arranged via a spectral filter 35 arranged at an appropriate interval to form an absorbance sensor section 37 that constitutes an absorbance measuring device.
And a flux acid value automatic measurement control circuit 38, which will be described later, constitute an absorbance measuring device so that a change in the absorbance of the test liquid 4 in the reaction tank 2 can be measured.

After the start switch 43 is turned on, the light source 36
Flux acid value automatic measurement control circuit 38 via the / O circuit 17
Lighting control is performed by a light source lighting control circuit 44 provided therein.

The lighting light of the light source 36 is the spectral filter 35, the condenser lens 3
4, The photoconductive conversion element 33 receives the absorbance level corresponding to the absorbance of the test liquid 4 through the transparent window 3a of the reaction tank 2, the test liquid 4, and the transparent window 3b. A signal from the photoconductive conversion element 33 is read by a CPU [central processing unit] 41 via a sensor amplifier 39 in an automatic flux acid value measurement control circuit 38 and an A / D [analog to digital] converter 40. Then, the titration pump 18 is driven through the I / O circuit 9 in accordance with the data read by the CPU 41, and the test liquid 4 is neutralized [the measured flux 20 and the titration standard solution 32 react and the color changes. Time point] until the titration pump 18 is driven.

Depending on the type of flux, especially in the case of a rosin-based flux, the color of the indicator at the neutralization point may be a color that is difficult to detect. In order to make it easy to detect, the alcohol-based solvent 23 is diluted in the reaction tank 2 by supplying a predetermined proportion of the solvent.

In this case, when an aqueous solution such as a sodium hydroxide aqueous solution having a concentration of 1 N is used as the titration standard solution 31, the moisture and the flux 20 to be measured react with each other to form a precipitate [may become cloudy], and the absorbance Measurement may not be possible.

Therefore, in the present device 1, in order to prevent such a phenomenon, the flux 20 to be measured and the alcohol solvent 23 are previously measured.
And the proportion of water in the titration standard solution 16 were experimentally determined to determine the proportion at which the above precipitate did not occur.
The titration pumps 21 and 26 are driven via the I / O circuit 9 to supply the flux 20 to be measured and the alcohol solvent 23 to the reaction tank 2 in appropriate amounts.

By doing so, the test liquid 4 in the reaction tank 2 is the flux 20 to be measured, the alcohol solvent 23, and the titration standard solution [aqueous solution] 31, so that the alcohol solvent is temporarily used.
Even if a precipitate that dissolves in 23 or a precipitate that dissolves in water is produced by the reaction, it is possible to dissolve either of the two precipitates.

For rosin flux, alcohol solvent
Some water-soluble precipitates dissolve in 23, and some water-soluble fluxes do not dissolve in the alcohol solvent 23 and some water-soluble precipitates occur.

As described above, the titration pumps 18, 21, 26 and 30 are controlled by the signals from the I / O circuit 9 to titrate and supply the titration standard solution 16, the flux 20 to be measured, and the alcohol solvent 23 to the reaction tank 2. Also, the supply amount of the indicator 32 is controlled.

Further, when such a method is adopted, an inexpensive sodium hydroxide aqueous solution or the like can be used as the titration standard solution 16 described above, and isopropyl alcohol or the like that is easily available can be used as the alcohol solvent 23. The acid value automatic measuring device 1 can be configured.

When the neutralization end point is completed and the absorbance measurement is completed as described above, the titration standard solution 16, the measured flux 20, the alcohol solvent 23, and the indicator 32 of the titration pumps 18, 21, 26, and 30 are supplied in titration amounts. Is read by the CPU 41.

That is, by knowing that the neutralization end point is completed by the data read by the CPU 41, when the absorbance measurement is completed, the titration standard solution 16, the measured flux 20, and the
The above-mentioned supply amount is found by the CPU 41 reading and calculating the titration supply amount supplied with the alcoholic solvent 23 and the indicator 32 by the signal from the titration pumps 18, 21, 26 and 30.

The acid value formed on the panel surface of the controller box (not shown) having the acid value automatic measurement control circuit 38 of the acid value of the flux, which is the unit value of the acid value defined by the chemical concept and the unit of the titration amount read by the CPU 41. The value display section 42 displays the acid value of the flux.

 An example of the acid value is shown below.

As described above, the "acid value" in the present invention refers to the specified concentration of the titration standard solution 16 capable of neutralizing a constant amount of the measured flux 20 at 20 ° C with an equivalent amount, and the unit is represented by N [normal]. Is.

Since the acid value of the flux thus defined can be proportional to the specific gravity value of the flux, the concentration value of the flux can be known by examining the acid value of the flux.

Now, it is assumed that 20 ml of the titration standard solution 16 is required to neutralize 5 ml of the measured flux 20. Titration standard solution 16
Assuming that the concentration of 0.1
When neutralizing with an equivalent amount of the titration standard solution 16, the normality of the titration standard solution 16 is (20 ml / 5 ml) × 0.1 normal = 0.4, and this value is expressed as an acid value of 0.4 [N].

 Therefore, if 30 ml of the titration standard solution 16 is required, (30 ml / 5 ml) × 0.1 normal = 0.4, and the acid value can be expressed as 0.6 [N].

 That is, the acid value is expressed by the following equation.

Acid value = (dropping amount of titration standard solution 16 / measured flux 20) × normality of titration standard solution 16 [Operation of the invention of the first embodiment] Acid value of the flux as the first embodiment of the present invention In the automatic measuring device 1, first, in measurement, the measured flux 20 to be measured is put in an appropriate amount in the measured flux container 11 in advance.

Next, in order to operate the device 1, a start switch
When 43 is pressed to turn it on, the solenoid valves 14, 24 and 28 are opened until there is a signal from the detection means (not shown),
After appropriately supplying titration standard solution 16, alcohol solvent 23, and indicator 32 into the titration standard solution container 10, the alcohol diluent container 12, and the indicator container 13, respectively, from the signal side (not shown), the CPU 41 and the I / O The signal through circuit 9,
The titration pump 26 operates to titrate and supply a preset amount of the alcoholic solvent 23 into the reaction tank 2 via the dropping pipe 27.

After that, the titration pumps 21 and 30 operate sequentially based on the signal from the I / O circuit 9, and the flux 20 to be measured and the indicator 32 are titrated and supplied into the reaction tank 2 through the dropping pipes 22 and 31.

The test liquid 4 in the reaction tank 2 composed of such a mixed liquid
Is stirred by the stirring blade 5 driven by the motor 6.

Next, the signal controlled by the CPU 41 causes the light source lighting control circuit 44 to light the light source 36 via the I / O circuit 17. The lighting light of the light source 36 passes through the spectral filter 35 and is split. It is convenient to prepare several types of spectral filters 35 according to various transmission wavelengths and automatically switch to a spectral filter 35 having an appropriate wavelength. Alternatively, the transmission wavelength of the spectral filter 35 is selected in advance as the wavelength of light most absorbed when the indicator 32 is colored.

The spectral light dispersed by the spectral filter 35 is condensed by the condenser lens 34, passes through the transparent window 3a, the test liquid 4 in the reaction tank 2 and the transparent window 3b, and is received by the photoconductive conversion element 33. .

At this stage, the titration pump 18 is activated by the signal from the I / O circuit 9.
Is operated to titrate the titration standard solution 16 in the titration standard solution container 10 into the reaction tank 2 through the dropping pipe 19.

When the titration standard solution 16 is titrated and supplied into the reaction tank 2, the absorption level of the photoconductive conversion element 33 is read by the CPU 41 via the sensor amplifier 39 and the A / D converter 40 each time it is dropped to obtain the absorbance. To measure.

The titration standard solution 16 is supplied in an appropriate amount, and the color of the indicator 32 develops near the neutralization point, so the absorbance becomes large,
Since the absorbance level of the photoconductive conversion element 33 decreases, the CPU 41 detects this and stops the titration pump 18.

After that, the CPU 41 uses the titration pumps 21, 26, and 3 to obtain titration data of the flux to be measured 20, alcohol solvent 23, and indicator 32.
The electrical signal from 0 is fed back and read through the I / O circuit 9, and the data in the CPU 41 is subjected to an acid deduction process to display the acid value of the flux on the acid value display section 42.

Alternatively, the data subjected to this acid-reduction treatment is used as a signal of the acid value of the flux, and is guided to a flux acid value automatic adjusting device [see, for example, FIG. 2] to automatically adjust the flux to a constant acid value. .

As described above, when the acid value of the flux is obtained, the operation of the titration pumps 18, 21, 26, 30 is stopped via the I / O circuit 9.

After the acid value measurement inspection of the flux is completed, the electromagnetic valve 8 closed by the signal from the I / O circuit 17 is opened, and the inspection liquid 4 in the reaction tank 2 is drained to the outside via the drain pipe 7.
In addition, the light source lighting light control circuit 4 according to the signal from the I / O circuit 9
At 4, the light source 36 is turned off.

[Second Embodiment of the Invention] FIG. 2 is an explanatory view of a system of a flux acid value automatic measuring device 1 ′ according to a second embodiment of the present invention. A flux using this flux acid value automatic measuring device 1 ′. The case where the present invention is applied to the automatic acid value adjusting device 46 of is shown. The second embodiment will be described below with reference to FIG.

It should be noted that the description of the parts common to the first embodiment is omitted and the description of FIG. 1 is cited, the same parts are designated by the same reference numerals, and the corresponding parts are designated by the reference numeral with a dash. To do.

The reaction tank 2 having an open upper end is filled with a test liquid 4'supplied by means to be described later. The above reaction tank 2
A solenoid valve 8 is provided in the lower part of the reactor via a waste liquid pipe 7, and the solenoid valve 8 is opened by a signal from an I / O (input / output) circuit 17 (not shown) shown in FIG. The test liquid 4'in the reaction tank 2 is drained into the waste liquid storage container 45 arranged in the lower part of the nozzle 2 or the like through the waste liquid pipe 7.

Titration standard solution container [water storage container] 10 ', which constitutes the titration standard solution tank [water storage tank], and titration standard solution container [sodium hydroxide aqueous solution storage container], which constitutes the supply standard solution tank [sodium hydroxide aqueous solution storage tank] ] 10 ", indicator container that constitutes the indicator tank [phenolphthalein solution storage container] 1
3'is installed in the upper part of the reaction tank 2, respectively.

The titration standard solution container 10 ″ communicates with a desiccant container 49 containing a desiccant 48 via a communication pipe 47.

At other appropriate places, there are an alcohol-based solvent container 12 'that constitutes an alcohol-based diluent tank for storing the alcohol-based solvent 23, and a flux stock solution container 11 "that stores a flux stock solution 20". However, the fluxer tank 11 '
Are installed at appropriate places outside the flux acid value automatic controller 1 '.

Water 16 'used as the titration standard solution is stored in the titration standard solution container 10', sodium hydroxide aqueous solution 16 "used as the titration standard solution is stored in the titration standard solution container 10", and indicator container 13 'is stored. Contains the phenolphthalein solution 32 'used as an indicator and is an alcohol solvent container
The alcoholic solvent 23 is stored in the 12 ', and the flux stock solution 20 "is stored in the flux stock solution container 11".
The fluxer tank 11 'of the flux acid value self-regulating device 46 contains a fluxer [a flux composed of a flux and an alcohol solvent] 20'.

In this case, the titration standard solution container 10 ′, the titration standard solution container 10 ″, and the indicator container 13 ′ are constantly supplied with a fixed amount of water through a solenoid valve and a supply pipe, which are not shown in the same manner as shown in FIG. 1. Water 16 ', sodium hydroxide aqueous solution 16 ", and phenolphthalein solution 32' are supplied.

The fluxer 20 'in the fluxer tank 11' is controlled to have a constant acid value and a constant liquid level, and the alcohol solvent 23 'in the alcohol solvent container 12' is controlled.
Also, the flux stock solution 20 ″ in the flux stock solution container 11 ″ is supplied by solenoid valves 51, 52 driven by a signal from an I / O circuit 9 (not shown) shown in FIG. 1 and supply pipes 54a, 54b, 54 It is adapted to be supplied to the fluxer tank 11 'via the.

The water 16 'in the titration standard solution container 10' passes through the titration pipe 19 by the operation of the solenoid valve 30 and the titration pump 18 driven by a signal from the I / O circuit 9 (not shown) shown in FIG. 16 'of water is added to the reaction tank 2 by dropping it.
Is appropriately titrated.

Aqueous sodium hydroxide solution in titration standard solution container 10 "1
6 ″ is obtained by dropping the sodium hydroxide aqueous solution 16 ″ through the titration pipe 19 ′ by the operation of the titration pump 18 ′ driven by a signal from the I / O circuit 9 (not shown) shown in FIG. Aqueous sodium hydroxide solution 1 in the reaction tank 2
It is designed to titrate 6 "as appropriate.

Phenolphthalein solution 32 'in indicator container 13'
Inside the reaction vessel 2 by dropping the phenolphthalein solution 32 'through the dropping pipe 31 by the operation of the solenoid valve 30 driven by the signal from the I / O circuit 9 (not shown) shown in FIG. An appropriate amount of phenolphthalein solution 32 'is titrated.

In addition, the alcohol solvent in the alcohol solvent container 12 '
Reference numeral 23 denotes the above reaction tank by titrating and supplying the alcoholic solvent 23 through the supply pipe 57 by the solenoid valve 55 and the supply pump 56 driven by the signal from the I / O circuit 9 (not shown) shown in FIG. An appropriate amount of alcohol-based solvent 23 is supplied into 2.

The fluxer 20 'in the fluxer tank 11' receives the electromagnetic valve 59, in response to a signal from the I / O circuit 9 (not shown) shown in FIG.
67 is closed, and the fluxer 20 'is dropped through the feed pipe 22' by the operation of the solenoid valves 58, 62 and the feed pump 65, so that the appropriate amount of the fluxer 20 'can be titrated into the reaction tank 2. ing.

The solenoid valves 59 and 67 are connected to the return pipe 61, and
Driven by the signal from the O circuit 9, the solenoid valves 58 and 58
And fluxer 2 remaining in the supply pipe 63 between 62 and 67
0'is returned to the fluxer 11 'through the operation of the supply pump 60 through the reflux pipe 61. Further, the solenoid valve 62 is connected to the air supply source 66 side via a supply pipe 64 and an air supply pump 65.

The solenoid valves 59, 67, 58 and 62 are appropriately switched by a signal from the I / O circuit 9, the solenoid valves 59 and 67 are closed, the solenoid valves 58 and 62 are opened, and the fluxer 2 in the fluxer tank 11 'is closed.
0'is supplied to the reaction tank 2 through the supply pipe 22 '.

As described above, the water 16 ', the sodium hydroxide aqueous solution 16 ", the phenolphthalein solution 32', the alcohol solvent 23 and the fluxer 20 'can be appropriately supplied into the reaction tank 2.

[Operation of the Second Embodiment of the Invention] An apparatus for automatically adjusting the acid value of the flux using the automatic apparatus for measuring the acid value of flux 1'as the second embodiment of the present invention 46.
First, in the measurement, a signal from a controller (not shown) of the flux acid value automatic adjusting device 46 in the fluxer tank 11 'functioning as a flux container to be measured to be measured in advance is used to perform measurement, which is not shown in FIG. I /
The solenoid valves 51, 52 and the supply pump 53 are driven based on the signal from the O circuit 9 to supply the flux stock solution 20 ″ in the flux stock solution container 11 ″ and the alcohol solvent 23 in the alcohol solvent container 12 ′ to the supply pipe 54a. The fluxer 20 ', which is formed by inserting an appropriate amount through 54b and 54b, is stored.

Next, in order to operate the device 1, a start switch
When 43 is turned on, the I / O circuit 1 (not shown) shown in FIG.
The signal from the I / O circuit 9 via the 7 and CPU 41 causes the solenoid valve 55
The supply pump 56 operates to supply a preset amount of the alcohol-based solvent 23 into the reaction tank 2 through the supply pipe 57.

At the same time, the solenoid valves 59 and 67 operate, and the supply pump 60
And the fluxer 20 'circulates in the supply pipe 63.

After that, the I / O circuit 9 (not shown) shown in FIG.
The supply pump 65 operates based on the signal from
The solenoid valves 59 and 61 are closed, and the solenoid valves 58 and 62 are operated to supply the fluxer 20 'to the reaction vessel 2 in an appropriate amount via the supply pipe 22'.

Also, a phenolphthalein container via the dripping pipe 31
An appropriate amount of the phenolphthalein solution 32 'in 13' is titrated into the reaction vessel 2. The test liquid 4'in the reaction tank 2 composed of such a mixed liquid is stirred by the stirring blade 5 (not shown) shown in FIG. 1 driven by the motor 6 (not shown) shown in FIG.

Next, the signal controlled by the CPU 41 (not shown) shown in FIG. 1 is sent to the light source by the light source lighting control circuit 44 (not shown) shown in FIG. 1 through the I / O circuit 17 (not shown) shown in FIG.
Turn on 36.

The lighting light of the light source 36 passes through the spectral filter 35 and is split. The spectral light dispersed by the spectral filter 35 is condensed by the condensing lens 34, and the transparent window 3a (not shown) shown in FIG. 1, the test liquid 4'in the reaction tank 2 and the not shown shown in FIG. It passes through the transparent window 3b and is received by the photoconductive conversion element 33.

At this stage, the titration pumps 18 and 18 'are operated by the signal from the I / O circuit 9 (not shown) shown in FIG.
Operating for a certain period of time, water in the titration standard solution containers 10 ', 10 "1
6 ', an aqueous solution of sodium hydroxide 16 ", and a fixed amount of a phenolphthalein solution 32' are titrated and fed into the reaction tank 2 through the dropping pipes 19 and 19 '.

In the reaction tank 2, water 16 ', sodium hydroxide aqueous solution 16 ",
When the phenolphthalein solution 32 'is titrated and supplied, the absorption level of the photoconductive conversion element 33 becomes the first level every time it is dropped.
Not shown sensor amplifier 39, A / D converter 40 shown in the figure
The absorbance is measured by being read by the CPU 41 via.

Phenolphthalein solution 32 'near the neutralization point
As the color develops, the absorbance becomes large and the photoconductive conversion element 33
Since the absorption level of is lowered, the CPU 41 detects this and stops the titration pumps 18, 18 '.

Thereafter, the CPU 41 reads the titration amount data of the sodium hydroxide aqueous solution 16 ″ from the supply pump 18 ′ via the I / O circuit 9 and arithmetically processes the data inside the CPU 41, which is not shown in FIG. The acid value is displayed on the acid value display unit 42.
Alternatively, this acid-treated data is further used as a flux acid value signal to automatically adjust the flux acid value.
Guide to a controller (not shown) 46 and automatically adjust the fluxer 20 'to a constant acid value.

After the measurement of the acid value of the flux is completed, the solenoid valve 8 closed by the signal from the I / O circuit 17 (not shown) shown in FIG. 1 is opened, and the test liquid 4'in the reaction tank 2 is connected to the waste liquid pipe 7. The liquid is drained to the external waste liquid storage tank 45 via.

In addition, the supply pump 56 and the solenoid valve 55 operate to operate the supply pipe.
The alcohol-based solvent 23 in the alcohol-based solvent container 12 ′ is supplied to the reaction tank 2 via 57 to clean the reaction tank 2 and after the cleaning, the electromagnetic wave which is closed by a signal from the I / O circuit 17 is closed. The valve 8 is opened, and the cleaning residue in the reaction tank 2 is drained into the waste liquid storage container 45 through the waste liquid pipe 7. Further, the control circuit 44 turns off the light source 36 in response to a signal from the I / O circuit 9.

[Effects of the Invention] As is clear from the above, in the present invention, by using a completely new chemical means, a completely new concept such as neutralization titration can be performed by a chemical method adapted to the nature of the flux. By doing so, even if the flux has an extremely low concentration, the concentration can be controlled very easily and highly accurately.

Further, in adopting the chemical means, a reagent used for measuring the acid value can be as inexpensive as possible and easily available, and therefore a very inexpensive measuring method can be performed.

Furthermore, by applying the present invention to a conventional flux concentration automatic adjusting device by a physical method, the low flux concentration can be accurately adjusted to a constant concentration value by the conventional flux concentration automatic adjusting device. Can be manageable.

In the above-mentioned embodiment of the present invention, an example in which an absorbance measuring device is used to measure the acid value of the flux has been shown, but the present invention is not limited to this, and other appropriate means such as a glass electrode is used. It goes without saying that it may be carried out using a pH electrode or a pH electrode, or may be carried out using other appropriate reagents or solutions. Although the above method is used as a means for supplying various solutions, the present invention is not limited to this, and it goes without saying that an appropriate solution may be used.

[Brief description of drawings]

FIG. 1 is a system diagram for explaining the first embodiment of the present invention, and FIG. 2 is a system diagram for explaining the second embodiment of the present invention. [Explanation of symbols] 1,1 '... Automatic flux acid value measuring device, 2 ... Reactor, 3a, 3b ... Transparent window, 4, 4' ... Test liquid, 5 ... Stirring blade, 6 ... … Motor, 7… Waste liquid pipe, 8… Solenoid valve, 9… I / O circuit, 10… Titration standard solution container, 10 ′… Titration standard solution container [water storage container], 10 ″… Titration Standard solution container [Sodium hydroxide solution]
Vessel, 11 …… Flux to be measured, 11´ …… Fluxer vessel, 11 ″ …… Flux stock solution vessel, 12,12´ …… Alcohol solvent vessel, 13 …… Indicator vessel, 13´ …… Phenolphthalein vessel [Indicator container], 14 …… Solenoid valve, 15 …… Supply pipe, 16 …… Titration standard solution, 16 ′ …… Water [Titration standard solution], 16 ″ …… Sodium hydroxide aqueous solution [Titration standard solution], 17 I / O circuit, 18 ... Titration pump, 19 ... Titration pipe, 20 ... Flux to be measured, 20 '... Fluxer, 20 "... Flux stock solution, 21 ... Titration pump, 22 ... Drip pipe , 22 '... Supply pipe, 23 ... Alcohol solvent, 24 ... Solenoid valve, 25 ... Supply pipe, 26 ... Titration pump, 27 ... Drip pipe, 28 ... Titration pump, 29 ... Supply pipe , 30 …… solenoid valve, 31 …… dripping pipe, 32 …… indicator, 32 ′… Phenolphthalein solution, 33 ... Photoconducting conversion element, 34 ... Condensing lens, 35 ... Spectral filter, 36 ... Light source, 37 ... Absorbance sensor section, 38 ... Flux acid value automatic measurement control circuit, 39 …… Sensor amplifier, 40 …… A / D converter, 41 …… CPU, 42 …… Acid value display, 43 …… Start switch, 44 …… Light source lighting control circuit, 45 …… Waste liquid storage container, 46… … Automatic flux acid value adjuster, 47 …… Communication pipe, 48 …… Desiccant, 49 …… Desiccant container, 50,51,52 …… Solenoid valve, 53 …… Supply pump, 54,54a, 54b …… Supply pipe, 55 …… Solenoid valve, 56 …… Supply pump, 57 …… Supply pipe, 58,59 …… Solenoid valve, 60 …… Supply pump, 61 …… Reflux pipe, 62 …… Solenoid valve, 63 , 64 …… Supply pipe, 65 …… Air supply pump, 66 …… Air supply source, 67 …… Solenoid valve.

Claims (4)

[Claims] 1. An apparatus for automatically measuring an acid value of a flux, comprising: Must have an alcohol solvent tank containing alcohol solvent. Must have an indicator tank containing the indicator. Must have a titration standard solution tank containing the titration standard solution. A reactor must be provided to hold the flux to be measured, alcohol solvent, indicator and titration standard solution. Means for supplying the alcohol solvent, the indicator and the titration standard solution between the reaction tank and the respective alcohol solvent tank, the indicator tank and the titration standard solution tank in an appropriate order and in an appropriate amount by a signal from the controller are provided. To have. An agitating means for reacting the flux to be measured with the titration standard solution by sequentially supplying an appropriate amount of an alcohol solvent, an indicator and a titration standard solution to the reaction tank in response to a signal from the controller. Neutralization in which the flux to be measured reacts with the titration application liquid to change color by sequentially supplying an appropriate amount of an alcohol solvent, an indicator and a titration standard solution to the reaction tank in response to a signal from the controller. Have a means to detect the end point. The relationship between the titration standard solution amount and the acid value is input in advance by the electric signal from the titration standard solution amount supply means capable of obtaining the electric signal from the titration pump and the electric signal obtained from the neutralization end point detection means. In this way, a circuit shall be provided to calculate the titration standard liquid amount supplied up to the neutralization end point as the acid value of the flux. 2. An apparatus for automatically measuring the acid value of a flux according to claim (1), which comprises the following components and: Must have a flux stock solution tank containing the flux stock solution. Must have a device for adjusting the acid value of the flux to be measured. 3. A circuit for calculating the titration standard liquid amount supplied up to the neutralization end point as the acid value of the flux, the circuit also detecting the supplied measured flux, alcohol solvent and indicator supply amount, The acid value automatic measuring device for a flux according to claim (1) or (2), which is configured to detect the acid value of. 4. A water tank containing water as an auxiliary means for dissolving white turbidity and precipitates produced by the reaction between the flux to be measured and the titration standard solution.
Item 5. An apparatus for automatically measuring an acid value of a flux according to any one of items (3) to (3).