JPH0328760A - Automatic measuring instrument for acid value of flux - Google Patents

Abstract

PURPOSE:To provide a means for controlling concns. including a low concn. with high accuracy by setting a new device which makes measurement by using a chemical means adjusted to meet the properties of a flux. CONSTITUTION:The flux 20 to be measured is put into a container 11 for measurement. The device 1 is turned on and solenoid valves 14, 24, 28 are opened to supply a standard soln. 16 for titration, an alcohol solvent 23, and an indicator 32 into respective containers. A titration pump 26 is operated, the 21, 30 are operated by the signals via a CPU 41 and an I/O circuit 9, by which the liquid is titrated and supplied into a reaction chamber 2. This inspecting liquid 4 is thus stirred. The signal controlled by the CPU 41 lights 1 light source 36 by a light source lighting control circuit 44 to spectrally split this light; thereafter, the light is passed through a transparent widnow 3a, the inspecting liquid 4, etc., and is detected in a photoelectric converting element 33. The soln. 16 in the standard liquid container 20 for titration is supplied into the reaction chamber 2 in this stage. The absorbance is measured via a sensor amplifier 39, etc., and the change in this value is arithmetically processed by the CPU 41. The acid value of the flux is displayed on a display part 42.

Description

[Detailed Description of the Invention] [Industrial Application Field of the Invention] The present invention relates to an automatic flux acid value measuring device for measuring the acid value of soldering flux used in electronic equipment, communication equipment, measuring instruments, etc. About. Regarding the definition of flux r acid value J. I will write about it later.

[Prior art and its problems] Applying flux before soldering electronic components to an object to be soldered, such as a printed circuit board or a wiring board, aims to activate the soldering process and ensure good soldering. This is to ensure proper attachment.

If the flux does not have an accurate specific gravity value [ξ concentration value], it will not be possible to secure a good solder I.10.

Particularly, due to its nature, flux for single-piece soldering, which is used in electronic equipment, etc., cannot be used to fill solder tubes with a constant quality unless the specific gravity is always maintained at a constant value.

For this reason, in the past, in order to keep the specific gravity of the flux constant, a hydrometer or an automatic specific gravity adjustment device [measuring the change in the specific gravity value of the flux and supplying an appropriate amount of flux or alcohol-based solvent until a constant specific gravity value is obtained. A method has been adopted in which the specific gravity of the flux is controlled using a device designed to maintain the specific gravity of the flux at a constant value.

Note that the flux is a mixture of flux and an alcohol solvent.

Here these days. As the trend toward high-density mounting on printed wiring boards has significantly slowed down, corrosion of electrical components, etc.
For the purpose of preventing parts damage, etc., there is a growing demand for a tendency towards low residue so that the degree of flux adhesion to printed wiring boards can be reduced.

In other words. According to the conventional flux specific gravity control method, if used as is, a high concentration [[
Compared to the concentration of flux, which tends to have low residue, the flux was coated [1], so it was not necessary to perform cleaning with Freon.

For this reason, there is an increasing trend towards low-rosin fluxes, which can be expected to produce less residue and require no cleaning.

For example, in the past. The solid component content of flux is 20
It used to be around 30%, but has recently reached the 10% range. It is expected that this trend toward low flux residue will further advance in the future for the various reasons mentioned above.

As mentioned above, when the solid component content of flux decreases. As the concentration value of flux decreases, it becomes difficult to manage the concentration of flux, which is trending toward lower rosin.
Conventional flux specific gravity adjustment devices that simply detect changes in flux specific gravity are no longer able to maintain a constant flux concentration with high precision, making it difficult to perform more precise soldering quality control. It's here.

5-6 [Problems to be solved by the invention] The present invention provides a new device that uses chemical means in place of the physical method typified by conventional specific gravity measurement, which is controlled by the physical concept of specific gravity. In particular, by making it possible to perform completely new concepts such as neutralization titration using chemical methods tailored to the properties of the flux, even fluxes with extremely low concentration values can be carried out with great ease. The object of the present invention is to provide a means for controlling concentration with high precision.

Furthermore, in adopting chemical means to achieve the above-mentioned objectives, it is also an issue to use reagents that are as inexpensive and easily available as possible for use in measuring the concentration.

Furthermore, by applying the present invention to a flux specific gravity automatic adjustment device using a conventional physical method, it is possible to accurately adjust a flux with a low concentration value to a constant specific gravity even with the conventional flux specific gravity automatic adjustment device. The aim was to make it well manageable.

Other issues will be clarified in the explanation below.

[Means for achieving the object of the invention] The object of the present invention is to provide an alcohol-based solvent tank containing an alcohol-based solvent, an indicator tank containing an indicator, a titration standard solution tank containing a titration standard solution, and a flux to be measured.
A reaction tank for containing an alcohol solvent, an indicator, and a titration standard solution, and a space between the reaction tank and each of the above-mentioned alcohol solvent tank, indicator tank, and titration standard solution tank, respectively. A means for supplying an indicator and a titration standard solution in an appropriate order and in an appropriate amount according to a signal from a controller, and a means for supplying an appropriate amount of an alcoholic solvent, an indicator, and a titration standard solution to the reaction tank in sequence according to a signal from the controller. A means for dissolving white turbidity and precipitates caused by the reaction of the alcoholic solvent, indicator, and titration standard solution by supplying the alcoholic solvent, indicator, and titration standard solution to the reaction tank according to a signal from the controller. A reactivity detection means for detecting the reactivity with an alcohol solvent, an indicator, and a titration standard solution by sequentially supplying an appropriate amount of a standard solution, and a reactivity value signal obtained from the -1 reactivity detection means. This can be achieved by providing an automatic flux acid value measurement device that includes a circuit for detecting at least the amount of titration standard solution of the liquid supplied according to the flux acid value as the flux acid value.

Other problems can be achieved by further providing a flux undiluted solution tank containing a flux undiluted solution and an automatic flux acid value adjustment device that is provided with an acid value adjustment device for the flux to be measured.

Another problem is 2) The circuit that detects the acid value of the flux detects not only the supplied titration standard solution but also the supplied flux to be measured, the alcohol solvent, and the supplied amount of the indicator. This can be achieved by configuring the device to detect the acid value, or by providing a water tank filled with water as an auxiliary means for dissolving the cloudiness and precipitates that result from the reaction between the flux to be measured and the titration standard solution. .

[Definition] Note. The 1' acid value used in the present invention is defined as the specified concentration of the titration standard solution that can neutralize one fixed amount of the flux to be measured at 20°C, and the unit is expressed in N [normal]. shall be.

[Embodiments of the Invention] [First Embodiment of the Invention] Figure 1 is an explanatory diagram of the system of the flux acid value automatic measuring device according to the first embodiment of the present invention. The first embodiment will now be described.

In the embodiment of the present invention-9 10, the reaction tank 2, which has a volume sufficient to accommodate a test liquid container 4 made of a mixture of liquids to be described later and is formed of an appropriate material and has an open upper end, is designed to accommodate the acid value of the flux. In order to detect this, an optical detection means (absorbance measuring device), which will be described later as an example, is employed, so transparent windows 3a and 3b are formed at the two positions of the reaction vessels 180 degrees symmetrical. In addition, when the reaction tank 2 is formed of a transparent material such as transparent glass, the transparent window 3a,
There is no need to take the trouble to form 3b.

The reaction tank 2 is filled with a test liquid 4 supplied by 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 is provided at the bottom of the reaction tank 2 and communicates with it via a solenoid valve 8 used as a waste liquid treatment mechanism, and the solenoid valve 8 is opened by a signal from the /0 (input/output) circuit 17. Thus, the test liquid 4 in the reaction tank 2 is drained to the outside via the waste liquid pipe 7.

a titration standard single solution container 10 constituting a titration standard solution tank; a measured flux container 11 forming an oval-shaped measured flux tank;
An alcoholic solvent container 12 constituting an alcoholic diluent tank and an indicator container 13 constituting an indicator tank are each installed at the upper part of the reaction tank 2.

Inside the titration standard solution container 10, a supply pipe 15 is connected via a solenoid valve 14 used as a standard solution supply control mechanism that is opened by a solenoid valve drive instruction data signal from the I/O circuit 9.
A titration standard solution 16 (not shown) having a constant concentration is appropriately supplied from the titration standard solution 16 .

The titration standard solution 16 is preferably an aqueous reagent that can be obtained very easily and at low cost; for example, a 0.1N aqueous sodium hydroxide solution is used.

The titration standard solution 16 in the standard solution container 10 is connected to the I/O circuit 9.
The titration standard solution 16 is dripped into the reaction tank 2 by dropping the titration standard solution 16 through one titration pipe by the operation of the titration pump 18 used as a standard solution supply control mechanism driven by the titration pump drive instruction data signal from the titration pump drive instruction data signal. The solution 16 is titrated and supplied as appropriate.

The flux to be measured container 11 stores a certain amount and a certain concentration of the flux to be measured 20 in advance.

Is this flux to be measured 20? As will be described later, this becomes the liquid to be measured.

The flux to be measured 20 in the flux to be measured container 11 is supplied via the dripping pipe 22 by the operation of the titration pump 21 used as a control mechanism for supplying the Norax to be measured, which is driven by the titration pump drive instruction data signal from the I/O circuit 9. By dropping the flux 20 to be measured, 1 L of the flux 20 to be measured is appropriately titrated into the reaction tank 2.

still. Measured flux container 1] is. It is convenient to use one with the upper end [in the drawing] open, as shown in Figure 1. Keep the device 1 tightly closed when not in use. Further, the flux container 11 to be measured uses its upper end opening to insert the flux 20 to be measured into the inside of the flux container 11 using appropriate means.
It may be configured to supply an appropriate amount of.

Alcohol at a constant concentration is supplied into the alcohol solvent container 12 from the supply pipe 25 side via the solenoid valve 24 used as an alcohol solvent supply control device driven by the solenoid valve drive instruction data signal from the I/O circuit 9. An appropriate amount of solvent 23 is supplied. As the alcohol solvent, it is convenient to use, for example, easily available isopropyl alcohol.

The alcohol solvent 23 in the alcohol solvent container 12 is supplied via the drip pipe 27 by the operation of the titration pump 26, which is used as an alcohol solvent supply control mechanism and is driven by the titration pump drive instruction data signal from the I/O circuit 9. An appropriate amount of alcohol solvent 23 is titrated into the reaction tank 2.

In addition, a constant concentration of indicator 13 1/1 32 is supplied to the indicator container 13 from the supply pipe 29 side via the electromagnetic valve 28 used as an indicator supply control mechanism driven by the electromagnetic valve drive instruction data signal from the I/O circuit 9. An appropriate amount of the indicator 32 is titrated and supplied into the reaction tank 2 via the dripping pipe 31 by the operation of the titration pump 30 used as an indicator supply controller driven by the titration pump drive instruction data signal from the I/O circuit 9. I have to.

The electromagnetic valves 14, 24 and 28 are controlled by signals from the ■/○ circuit 9 to open when the titration pumps 18, 26 and 30 are operated.

Therefore. When the titration pumps 1, 8, 26 and 30 are operated, appropriate amounts of the titration standard solution 16, alcohol solvent 23 and indicator 32 are placed in the titration standard solution container 10, alcohol solvent container 12 and indicator container 13, respectively. need to be fulfilled. Of course, in this case, it is necessary that a certain amount of the flux to be measured 20 be filled in the flux to be measured container 11 as well.

In the case shown in Fig. 1, since the remaining amount of the flux 20 to be measured in 1 liter of the flux container to be measured is unknown,
in this case. It is convenient to detect the remaining amount of the flux 20 to be measured in the flux container 11 by an appropriate means and to provide a display or warning of the remaining flux.

In addition, the titration standard solution container 10, alcoholic solvent container 12, and indicator container] 3 are operated by the solenoid valve 14. ．． 2
4 and 28 are closed, and the standard sediment container 10, alcohol solvent container 12, and indicator container 13 are hermetically sealed.

The solenoid valves 1.4, 24 and 28 are connected to the titration standard solution container 10. Alcohol-based solvent container 12 and indicator container]
3 When operated by the signals from the corresponding titration pumps 18, 26 and 30 or ■/○ circuits 9, the same <
It is designed to be opened by a signal from the I/O circuit 9.

A photoconductive conversion element 33 that changes from light reception to no is disposed opposite the transparent four-way window 3b formed in the L-recording tank 2, and the transparent window 3
A condensing lens 34 is arranged opposite to a, and the condensing lens 34
4? Spectral filters 35 arranged at appropriate intervals in the Te section
By arranging a light source 36 such as an incandescent lamp through a light source 36, an absorbance sensor section 37 for controlling the absorbance measuring device is formed. 38 constitutes an absorbance measuring device,
The change in absorbance of the test liquid 4 in the reaction tank 2 can be measured.

After the star l switch 43 is turned on, the light source 36 is controlled to be turned on by the light source lighting control circuit 44 provided in the flux acid value automatic measurement control circuit 38 via the /0 circuit ↑7. It has become so.

The lighting light from the light source 36 passes through the spectral filter 35, the condensing lens 34, the transparent window 3a of the reaction tank 2, the test liquid 4, and the transparent window 3b, and converts the absorbance level corresponding to the absorbance of the test liquid 4 into the photoconductive conversion element. The light is received at 33. The signal from the photoconductive conversion element 33 is transmitted to the flux acid value automatic measurement control circuit i.
It is read by the CPU [Central Processing Unit] 41 via the sensor amplifier 39 and A/D [analog to digital] converter 40 within ¥838, and the I/O times iY8 9, the titration pump 18 is driven until the test liquid 4 reaches the neutralization end point [the point at which the flux to be measured 20 and the titration standard solution 32 react and change color].

Note that depending on the type of flux, especially in the case of rosin-based flux, there are some that exhibit a color that is difficult to detect due to the color development of the indicator at the neutralization point, so this device 1 detects the color change of the flux 20 to be measured. In order to facilitate this process, an alcoholic solvent 23 is supplied in a preset amount in the reaction tank 2 to dilute it.

In this case, the titration standard solution 31 is an aqueous solution, for example, with a concentration of 1
If a specified aqueous sodium hydroxide solution is used, moisture and flux 20 to be measured may react to form a precipitate (which may become cloudy), making absorbance measurement impossible.

17 18 Therefore, in this device 1, in order to prevent such a phenomenon, the flux to be measured 20 and the alcohol-based solvent 2 are prepared in advance.
CPtJ4.3 and the proportion of water in titration standard solution 16 were experimentally adjusted to determine the proportion at which the above-mentioned precipitate does not form. The drive of the titration pumps 2 and 26 is controlled via the I/O circuit 9 in accordance with the control signals of the titration pumps 2 and 26, thereby supplying appropriate amounts of the flux 20 to be measured and the alcoholic solvent 23 into the reaction tank 2.

In this way, since the test solution 4 in the reaction tank 2 contains the flux to be measured 20, the alcoholic solvent 23, and the titration standard solution [aqueous solution 3], it is assumed that the precipitate dissolved in the alcoholic solvent 23, Alternatively, even if a precipitate that is soluble in water is produced by the reaction, either of the two precipitates can be dissolved.

In addition, for rosin-based flux, alcohol-based solvent 23
When the flux is dissolved in water, a precipitate is formed which is insoluble in water.2 On the other hand, when the flux is water-soluble, a precipitate which is insoluble in water is formed.

As described above, the titration pumps 18, 21, 26, and 30 are controlled by the signals from the T/O circuit 9, and the titration standard solution 16, the i1JII constant flux 20, and the alcoholic solvent are supplied dropwise into the reaction tank 2. 23 and the indicator 32 are controlled.

Furthermore, if such a method is adopted, an inexpensive aqueous sodium hydroxide solution or the like can be used as the titration standard solution 16 as described above, and easily available isobrobyl alcohol or the like can be used as the alcohol solvent 23. The acid value automatic measuring device 1 of the desired flux can be used in various ways.

When the neutralization end point is completed and the absorbance measurement is completed as described above, each of the titration standard solutions for the titration pumps 18, 21, 26 and 30] 6, the flux to be measured 20. Titration supply amount of alcohol solvent 23 and indicator 32 is CPtJ4
] to read.

A flux acid value automatic measurement control circuit 3 calculates the titer read by the CPU 4.1 from a chemical concept and a theta value of a unit concept called an acid value defined by the position L-).
The acid value of the flux is displayed on an acid level display section 42 formed on the panel surface of a Con I roller pox (not shown).

Examples of acid values are shown below.

As mentioned above, the "acid value" in ↓3 of the present invention refers to the specified concentration of the titration standard solution 16 that can equivalently neutralize a certain amount of the measured flux 20 at 20°C, and the unit is N.
It is expressed as [normal].

Since the acid value of the flux defined in this way can be directly correlated to the specific gravity value of the flux, it is possible to find out the concentration value of the flux by measuring the acid value of the above flux. Ru.

Suppose now that 20 mffl of the titration standard solution 16 is required to neutralize 5 m4 of the constant flux 20. Assuming that the concentration of the titration standard solution 16 is 01, the titration standard solution 16 is equivalent to the flux to be measured 20.
When neutralizing with , the normality of the titration standard solution 16 is (20m.&/5mffl) x 0.1 normality = 0. 4, and this value is expressed as an acid value of 0.41U].

If 30 mg of titration standard solution 16 is required at 7iC (
Yo. (30m4/5TTI!l)X
0. 1 normality = 04, which can be expressed as acid value -0.6 [N].

In other words, the acid value can be expressed as the following formula.

Acid value - (Dropped amount of titration standard solution 16 / Flux to be measured 20) x Normality of titration standard solution 16 [Operation of the invention of the first embodiment] Acid of Franx as the first embodiment of the present invention In the automatic value measuring device 1, the flux to be measured 20 to be measured is first placed in the flux container to be measured 1.
] Put an appropriate amount in 2] 22.

next. In order to operate this device 1, when the switch 43 is turned on by suppressing the switch 43, the solenoid valves 14, 24 and 28 are turned on until a signal is received from a detection means (not shown).
Open it and add the titration standard solution 16, alcoholic solvent 23 into the titration standard solution container 10, alcohol diluent container 12, and indicator container 13 from the signal measurement (not shown).
, after supplying an appropriate amount of indicator 32, first, CPU
4. 1 and the signal via the I/O circuit 9, the titration pump 26 operates, and a preset amount of alcoholic solvent 2 is supplied.
3 is titrated into the reaction tank 2 via the drip pipe 27.

Then, based on the signals from the I/O circuit 9, titration pump 2]. , 30 are operated, and the flux to be measured 20 and the indicator 32 are titrated into the reaction tank 2 via the drip pipes 22 and 31.

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

Next, the signal controlled by the CPIJ41 is sent to the I/O circuit 17.
The light source 36 is turned on by the light source lighting control circuit 44 via the light source lighting control circuit 44. The lighting light from the light source 36 passes through the spectral filter 35 and is separated into spectra. It is convenient to prepare several types of spectral filters 35 to suit various transmission wavelengths and to automatically switch to the spectral filter 35 with the appropriate wavelength. Alternatively, the transmission wavelength of the spectral filter 35 is set in advance as follows:
The wavelength of light that is best absorbed when the indicator 32 develops color is selected in advance.

The spectral light separated by the spectral filter 35 is condensed by the condensing lens 34 and sent to the transparent window 3a. The test liquid 4 in the reaction tank 2 and the photoconductive conversion element 3 pass through the transparent window 3b.
The light is received at 3.

In this stage 1 dive, the titration pump 18 is activated by a signal from the I/O circuit 9, and the titration standard solution 16 in the titration standard solution container 10 is titrated and supplied into the reaction tank 2 via the droplet F pipe 19. Ru.

When the titration standard solution 16 is titrated and supplied into the reaction tank 2, each time it is dropped, the light absorption level of the photoconductive conversion element 33 or the sensor amplifier 39. CPI via A/D converter 40
J4. ] to measure the absorbance.

An appropriate amount of the titration standard solution 16 is supplied, and when the neutralization point is reached, the indicator 32 develops a color, the absorbance increases, and the absorbance level of the photoconductive conversion element 33 decreases.
The PU 41 detects this and stops the titration pump 18.

However, 1.1 (, CPU 4.1
0. The titration data of the alcohol solvent 23 and the indicator 32 are fed back from the titration pumps 21, 26, 30 and read through the I/O circuit 9, and the data is processed internally by the CPU 4 and displayed on the acid value display section 42. Displays the acid value of flux.

Alternatively, this arithmetic processing data is further used as a flux acid value signal and guided to a flux acid value automatic adjustment device [for example, see Figure 2], so that the flux is maintained at a constant acid value. Automatically adjust.

As above. When the acid value of the flux is obtained, the titration bomb 1.8.21 2 is passed through the 1/0 circuit 9.
6. Stop the operation at 30.

After the flux acid value measurement test is completed, the solenoid valve 8 that was previously closed is opened by a signal from the I/O circuit 17, and the reaction tank 2 is opened.
The test liquid 4 inside is drained to the outside via a waste liquid pipe 7. Further, the light source 36 is turned off by the light source lighting control circuit 44 in response to a signal from the I/O circuit 9.

[Second Embodiment of the Invention] Fig. 2 is an explanatory diagram of a system of an automatic flux acid value measuring device 1' according to a second embodiment of the present invention. A case where it is applied to an automatic acid value adjustment device 46 is shown. The second saturation example will be explained below with reference to FIG.

The explanation of the parts common to the first embodiment above will be omitted and the explanation of FIG. 1 will be referred to. shall be.

The reaction tank 2 whose upper end is opened 1" is filled with a test liquid 4" supplied by means described later.
A solenoid valve 8 is installed at the lower part of the unit via a waste liquid pipe 7, and the solenoid valve 8 is connected to an I/O (input/output) not shown in FIG.
By being opened by the signal from circuit 17, reaction tank 2
The test liquid 4' in the reaction tank 2 is drained via the waste liquid pipe 7 into a waste liquid storage container 45 disposed at the bottom of the tank.

Titration standard solution container [water storage container] 10' that constitutes the titration standard solution tank [water storage tank], supply standard solution tank [sodium hydroxide 1~
The titration standard solution container [sodium hydroxide 1 helium aqueous solution storage container] 10''' constituting the 1-helium aqueous solution storage tank], the indicator container [phenolphthalein solution storage container] 13' that constitutes the indicator tank are each connected to the reaction tank 2. It is set in the second part of '.

The titration standard solution container 10'' communicates with four desiccant storage containers containing a desiccant 48 via a communication pipe 47.

Other appropriate locations include an alcohol solvent container 12° for storing an alcohol solvent 23 and a flux stock solution container 11' for storing a flux stock solution 20''. However, the fluxer tank 11' is installed at an appropriate location outside the flux acid value automatic regulator 1.

The titration standard solution container 10' contains water 16' used as the titration standard solution, and the titration standard solution container 10'' contains aqueous sodium hydroxide solution M].6 used as the titration standard solution.
The indicator container 13'' contains a phenolphthalein solution 32° used as an indicator, and the alcohol solvent container 12' contains an alcohol solvent 23. The flux undiluted solution 20 is in the flux undiluted solution container 11.
"' is housed, and Fusix's Shun value self-adjusting device 4
6, the fluxer tank 11' contains 20" fluxer [flux consisting of flux and alcohol solvent].
is accommodated.

In this case, titration standard solution container 10', titration standard solution container 10" and indicator container ↓3' are constantly supplied with a constant amount via solenoid valves and supply pipes (not shown), respectively, as shown in FIG. 16" of water, 16" of sodium hydroxide aqueous solution, and 32" of pheno-norephthalein solution 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° and the flux stock solution container The flux stock solution 20'' in 11'' is connected to I/
Solenoid valve 51.5 driven by a signal from O circuit 9
2 and the supply vibrator 54a by the supply pump 53.
It is supplied to the flux tank 1 through 4b and 54.

The water 16' in the titration standard solution container 10' is . Water 16' is dripped into the reaction tank 2 through one titration pipe by the operation of the solenoid valve 30 and the titration pump 18, which are driven by a signal from the I/O circuit 9 (not shown) shown in the first country. An appropriate amount of water 16' is titrated and supplied.

Sodium hydroxide aqueous solution 1 in titration standard solution container 10''
6'' is a titration pump 18° driven by a signal from the I/O circuit 9 (not shown) shown in FIG. In other words, an appropriate amount of sodium hydroxide aqueous solution 16'' is titrated into the reaction tank 2.

Phenolphthalein solution 32'' in indicator container 13'
The above reaction tank 2 is dripped by dropping the phenolphthalein solution 32' through the dripping pipe 31 by the operation of the solenoid valve 30 driven by a signal from the D/O circuit 9 (not shown) shown in FIG. An appropriate amount of a solution 32' of two phenolphthalenes is titrated into the container.

The alcohol solvent 23 in the alcohol solvent container 12' is supplied to the alcohol via a supply pipe 57 by a solenoid valve 55 and a supply pump 56 which are driven by a signal from the I/O circuit 9 (not shown) shown in FIG. By titrating and supplying the alcoholic solvent 23, an appropriate amount of the alcoholic solvent 23 is supplied into the reaction tank 2.

The fluxer 20 in the fluxer tank 11' closes the solenoid valves 59 and 67 in response to a signal from the unillustrated ■/○ circuit 9 shown in FIG.
5 through the supply pipe 22'.
By dropping 0'. The frac in the above reaction tank 2 →
An appropriate amount of No. 20' is titrated and supplied.

still. The solenoid valves 59 and 67 are connected to the recirculation pipe 61 and driven by a signal from the I/O circuit 9 to remove the fluxer 2 remaining in the supply pipe 63 between the solenoid valves 58 and 58 and 62 and 67. ' is refluxed to the fluxer 11' through the reflux pipe 61 by operation of the supply pump 60. Further, the solenoid valve 62 is connected to an air supply source 66 via a supply pipe 64 and an air supply pump 65.

In addition, the solenoid valves 59, 67, 58 and 62 are connected to the I/O circuit 9.
The solenoid valves 59 and 67 are closed and the two solenoid valves 58 and 62 are opened, and the fluxer $
1! Supply pipe 22' with fluxer 20'' within 1.1°
It is supplied to the reaction tank 2 via the .

As described above, water 16', sodium hydroxide aqueous solution 16', and phenolphthalein solution 32' were placed in the reaction tank 2.
, alcohol solvent 23 and fluxer 20' are supplied in appropriate amounts.

[Operation of the invention according to the second embodiment] Flux acid value automatic adjustment device 46 using the flux acid value automatic measurement device 1' according to the second embodiment of the present invention
First, for the measurement, the flux shown in FIG. 1 is set in advance by a signal from a controller (not shown) of the automatic flux acid value adjustment device 46 in the fluxer tank 11' which functions as a container for the flux to be measured. No I/O times? ' Solenoid valve 5 based on the signal from f19.
1. ．． 52 and the supply pump 53 to supply appropriate amounts of the flux stock solution 20'' in the flux stock solution container 1'' and the alcohol solvent 23 in the alcohol solvent container 12' via the supply pipes 54a, 54b and 54. The fluxer 20' thus formed is stored.

Next, when the star 1 switch 43 is turned on in order to operate the device 1, the
The solenoid valve 55 and the supply pump 56 are operated by a signal from the I/O circuit 9 via the circuit 17 and the CPU 4. A preset amount of alcoholic solvent 23 is supplied into the reaction vessel 2 via the supply pipe 57.

At the same time, five solenoid valves and 67 operate, and supply pump 60 also operates to circulate fluxer 20' through supply pipe 63.

Thereafter, the supply pump 65 operates based on a signal from the I/O circuit 9 (not shown) shown in FIG.
62 operates, and a suitable amount of fluxer 20° is titrated and supplied to the reaction tank 2 via the supply pipe 22'.

Further, the phenolphthalein solution 32' in the phenolphthalein container 13' is supplied to the reaction tank 2 through the dripping pipe 31.
The appropriate amount is titrated and supplied. The test liquid 4' in the reaction tank 2 made of such a mixed liquid is stirred by a stirring blade 5 (not shown) shown in FIG. 1 driven by a motor 6 (not shown) shown in FIG.

Next, the signal controlled by the CPU 41 (not shown) shown in FIG. 1 is transmitted to the light source 36 by the light source lighting control circuit 44 (not shown) shown in FIG. 33 34 lights up.

The lighting light from the light source 36 is transmitted through a seven-spectrum filter 35 and separated into spectra. The spectral light separated by the spectral filter 35 is condensed by the condensing lens 34 to the transparent window 3a (not shown) shown in FIG. The light 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 a signal from the 1/0 circuit 9 (not shown) shown in FIG.
, 10" of water 16'.Sodium hydroxide 1-.Lium aqueous solution 1
6'', a quantity of phenolphthalein solution 32' is titrated into the reaction vessel 2 via the drip pipe 19,19'.

In reaction tank 2, there is 16' of water and 16' of sodium hydroxide aqueous solution.
'', when the phenolphthalein solution 32' is titrated and supplied, the light absorption level of the photoconductive conversion element 33 increases as shown in FIG.
It is read by CPIJ4 1 via a D converter 40 and the absorbance is measured.

When the neutralization point approaches A.1, the phenolphthalein solution 3
2' develops color, the absorbance increases and the light absorption level of the photoconductive conversion element 33 decreases, so the CPU 41 detects this and stops the titration pumps 18 and 18'.

However, Q, is CPU41 soluble in sodium monohydroxide? ? The data on the titration amount of il6" is read from the supply bomb 18' via the I/O circuit 9, and the data is arithmetic-processed inside the CI) U/11, and the acid value is displayed on the acid value display section 42 (not shown) shown in FIG. Alternatively, this arithmetic processed data is further used as a flux acid value signal and guided to a controller (not shown) of the flux acid value automatic adjustment device 46 to automatically control the fluxer 20 to maintain a constant acid value. Adjust.

After the acid value measurement test of the flux is completed, the electromagnetic valve 8, which had been closed, is opened in response to a signal from the I/O circuit 17 (not shown) shown in FIG. The liquid is drained into an external waste liquid storage tank 45 through the waste liquid storage tank 45.

In addition, the supply pump 56, solenoid, and valve 55 operate to supply the alcohol solvent 23 in the alcohol solvent container 12' into the reaction tank 2 through the supply pipe 57 to clean the inside of the reaction tank 2. , the solenoid valve 8, which had been closed, is opened by a signal from the I/O circuit 17, and the cleaning residue in the reaction tank 2 is drained into the waste liquid storage container 45 via 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, the present invention uses completely new chemical means, and in particular, enables completely new concepts such as neutralization titration to be performed using chemical methods tailored to the properties of flux. By doing so, the concentration can be controlled extremely easily and with high precision even for extremely low concentration fluxes.

In addition, when adopting the chemical method, it is possible to obtain as many inexpensive reagents as possible and use the reagents used to measure the acid value, making it possible to perform a very inexpensive measurement method.

Furthermore, by applying the present invention to a flux concentration automatic adjustment device using a conventional physical method, it is possible to adjust a low concentration flux to a constant concentration value with high accuracy even with the conventional flux concentration automatic adjustment device. 《It can be made manageable.

still. In the above embodiment of the present invention. Although we have shown an example of using an absorbance measuring device to measure the acid value of flux, it is not limited to this, and other appropriate means, such as
It goes without saying that this may be carried out using a glass electrode or a PH electrode, or may be carried out using other appropriate reagents and solutions. Further, although the above-mentioned method is used as an example as means for supplying various solutions, it goes without saying that the present invention is not limited to these methods and that any suitable device may be used.

37 38

[Brief explanation of drawings]

FIG. 1 shows a system for explaining the first embodiment of the present invention.
1 and 2 are system diagrams for explaining a second embodiment of the present invention. [Explanation of symbols] ], 1" - Flux acid value automatic measurement device, 2... Reaction tank 7 3a, 3b... Transparent window 4, 4" - Test liquid, 5 - Stirring blade 6 - Motor 7... Waste liquid pipe 8... Solenoid valve 9... I/O circuit] 0... Titration standard solution container 10' - Titration standard solution container [water storage container], Titration standard solution container [Na hydroxide I/1 0 Lium aqueous solution] container, flux container to be measured, ・Fluxer container・・Flux stock solution container 12′ ・・・Alcoholic solvent container・・Indicator container・・phenolphthalein container [indicator container] Solenoid valve/supply pipe, ・Titration standard solution・Water [titration standard solution] ... Sodium hydroxide aqueous solution [titration standard solution] I/O circuit, titration pump/titration pipe, flux to be measured/fluxer/flux stock solution, 1 7 ・ ・ 1 8 1 ・ 20 ・ ・20' ・ 20 11 1-1 1 1 ' 1 2, 1 3 ・ 1 3 ・ 1 4 1 5 ・ ・ 1 6 ・ ・ 1 6 ・ 1 6' ・Titration pump・Dripping pipe supply pipe・Alcohol solvent・Electromagnetic Valve Supply pipe Titration pump Dripping pipe Titration pump, ... Supply pipe, - Solenoid valve, - Dripping pipe Indicator phenolphthalein solution Photoconductive conversion element Toko lens Spectral filter / light source, absorbance sensor part Automatic measurement control of acid value of flux Recess 2 1 ・ ・ 2 2 22 2 3 24 2 5 ・ 2 6 2 7 ・ 28 2 9 3 0 ・ 31 32 32' ・ 33 34 ・ 35 3 6 ・ 37 3 8 Road sensor amplifier...A/D converter CP [1・Acid value display start switch, Light source lighting control circuit Waste liquid storage container Flux acid value automatic adjustment device Communication pipe ・Desicant Desiccant storage container 51, 52 ・Solenoid valve supply pump, 54a, 541) Supply pipe Solenoid valve supply pump Supply pipe Solenoid valve Supply pump 3 4 0 41 4 2 /l. 3 4 4 45 4 6 1 7 4 8 ・ /1 50 53 54 55 5 6 ・ 57 58 5 9 6 0 A1 /12 61 6 2 ・ 63 6 5 ・ 6 6 ・ 6 7 6 ・Return pipe, solenoid valve 4 - Supply pipe air supply pump air supply source, - Solenoid valve.

Claims (4)

[Claims] (1) An automatic flux acid value measuring device characterized by comprising the following components [1] to [8]. [1] Must have an alcohol solvent tank containing alcohol solvent. [2] Must have an indicator tank containing an indicator. [3] Have a titration standard solution tank containing the titration standard solution. [4] It must have a reaction tank to hold the flux to be measured, alcoholic solvent, indicator, and titration standard solution. [5] To supply the alcohol solvent, indicator, and titration standard solution between the reaction tank and each of the alcohol solvent tank, indicator tank, and titration standard solution tank in an appropriate order and in an appropriate amount according to a signal from the controller. have the means to [6] By sequentially supplying appropriate amounts of an alcoholic solvent, an indicator, and a titration standard solution to the reaction tank according to a signal from the controller, white turbidity or precipitate is generated due to the reaction between the flux to be measured and the titration standard solution. have a means to dissolve etc. [7] Reactivity detecting the reactivity between the flux to be measured and the titration standard solution by sequentially supplying appropriate amounts of an alcoholic solvent, an indicator, and a titration standard solution to the reaction tank according to a signal from the controller. Must have detection means. [8] It has a circuit that detects at least the amount of the titration standard solution among the supplied liquids as the acid value of the flux in accordance with the reactivity value signal obtained from the reactivity detection means. (2) The automatic flux acid value measuring device according to claim (1), characterized by comprising the following components [9] and [10]. [9] Have a flux undiluted solution tank containing flux undiluted solution. [10] Have an acid value adjusting device for the flux to be measured. (3) The circuit that detects the acid value of the flux is designed to detect the acid value of the flux by detecting not only the titration standard solution supplied but also the supply amount of the supplied flux to be measured, alcoholic solvent, and indicator. An automatic flux acid value measuring device according to claim (1) or (2), which is configured as follows. (4) Claims (1) to (3) include a water tank containing water as an auxiliary means for dissolving cloudiness and precipitates caused by the reaction between the flux to be measured and the titration standard solution. 2. The automatic flux acid value measuring device according to any one of the above items.