JP2753438B2 - Flux cleaning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flux cleaning apparatus for cleaning a flux of a printed circuit board on which electronic components are mounted and soldered.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory view showing the structure of a conventional flux cleaning apparatus. In the figure, reference numeral 201 denotes a belt conveyor serving as a moving path of a printed circuit board, and along this belt conveyor 201, a first cleaning unit 202, a second cleaning unit 203, a third cleaning unit 204, and a heating unit 205. , A dryer section 206 are provided side by side.

[0003] In a first cleaning section 202, cleaning is performed by spraying warm water in a mist form onto a printed circuit board on a belt conveyor 201 from above and below. In the second cleaning unit 203, the hot water used in the third cleaning unit 204 is heated to 65 ° C. as described later.
The heating is performed by re-heating to a degree and spraying from above and below the printed circuit board on the belt conveyer 201 that has passed through the first cleaning unit 202 in the form of a mist.

[0004] In a third cleaning section 204, fresh water is supplied at 65 ° C.
Heating is performed to a degree, and spraying is performed from above and below the printed circuit board on the belt conveyer 201 after passing through the second cleaning unit 203 in the form of a mist. The heating unit 205 irradiates heat rays from above and below the printed circuit board that has passed through the first, second, and third cleaning units 202, 203, and 204 to dry moisture.

[0005] In the dryer section 206 , hot air of 85 ° C is blown from above and below the printed circuit board that has passed through the heating section 205 to dry the moisture.

[0006]

However, the above-mentioned conventional flux cleaning apparatus has the following problems. That is, fresh cleaning water must be constantly supplied to the third cleaning section. For example, if about 80 printed circuit boards are cleaned per hour, the water supply amount is about 2 times.
It requires 00 liters, and 4800 liters per day when operated continuously for 24 hours.

[0007] Further, in the case of cleaning a printed circuit board having a specification in which chlorine ions or the like must not remain, the cleaning must be performed using pure water.
Equipment for producing 800 liters of pure water is required. In addition, since 4,800 liters of wastewater is drained per day, there is a problem that a wastewater treatment facility having a processing capacity of 4,800 liters per day is required.

The present invention has been made to solve the problem that a large amount of water supply and drainage is required for cleaning a printed circuit board as described above. That is, an object of the present invention is to provide a flux cleaning apparatus capable of reducing the amount of water supply and drainage without deteriorating the cleaning performance by providing a means for cleaning the cleaning water so that the water can be used repeatedly.

[0009]

In order to achieve this object, the present invention provides a detergent washing section for washing a flux adhered to a printed circuit board with a detergent, and a detergent washing section provided downstream of the detergent washing section. In a flux cleaning apparatus provided with a plurality of rinse cleaning sections for washing the printed circuit board that has passed through the section with water and cleaning the detergent stepwise, the flux cleaning apparatus is provided corresponding to the rinse cleaning section provided immediately after the detergent cleaning section. Separation means comprising an oil-water separation membrane that separates the aqueous detergent solution recovered from the rinsing unit into oil and water with the oil content kept below a certain level is provided, and the separated water is supplied to the rinsing unit that recovered this aqueous detergent solution. Return and use as washing water again, and provide a piping route for discharging oil, and select one or more from a plurality of rinsing washing sections and correspond to them. It is provided with a filtration means comprising a reverse osmosis membrane for separating the aqueous detergent solution recovered from these rinsing washing parts into pure water and concentrated water containing detergent, and the separated concentrated water is located upstream of the rinsing washing part where the aqueous detergent solution is recovered. The cleaning water is sent to a rinse cleaning section and a detergent cleaning section to be used as cleaning water, and the clean water is returned to the rinse cleaning section in which the aqueous detergent solution is collected, and a piping path is provided for use as cleaning water.

Further, the concentrated water separated by the filtration means is supplied to a rinsing section and a detergent cleaning section by two pipe paths, one of which is a path for supplying a fixed amount of concentrated water, and the other is intermittently concentrated. It is characterized by a path for supplying water.

[0011]

According to the present invention having the above-described structure, a printed circuit board on which electronic components are mounted and soldered is washed with a detergent in a detergent washing section, and then washed with water in a plurality of rinsing sections. And wash away the detergent. Here, in the rinse washing section provided immediately after the detergent washing section, the detergent aqueous solution generated by washing is collected, and separated into oil (detergent) and water using an oil-water separation membrane. Then, this water and the concentrated water separated by the reverse osmosis membrane from the detergent aqueous solution collected in the subsequent rinse washing section are used as washing water, and the separated oil is discharged.

[0012] Further, in the rinse washing section provided immediately after the detergent washing section and subsequent to the rinse washing section, a detergent aqueous solution generated by washing is collected, and the aqueous solution is purified using a reverse osmosis membrane. And the concentrated water containing the detergent, and the pure water is returned to the rinsing section where the aqueous detergent solution is collected and used as the washing water. Further, the concentrated water separated by the reverse osmosis membrane after collecting the detergent aqueous solution generated at the time of washing from the rinse washing section is supplied to the detergent washing section and the rinse washing section preceding the rinse washing section from which the detergent aqueous solution was collected. However, the number of supply paths is two, one is a path for supplying a fixed amount, and the other is a path for intermittent supply, so that the detergent contained in the washing water in the detergent washing section and the rinsing section is reduced. The amount of concentrated water containing detergent is adjusted and supplied in consideration of the concentration and the like.

[0013]

An embodiment will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration and a processing flow of a flux cleaning apparatus according to a first embodiment of the present invention. In the drawing, reference numeral 1 denotes a conveyor constituting a moving path of a printed circuit board 2 to be cleaned, and 3 denotes a first washing tank for washing a flux adhering to the printed circuit board 2 with a detergent or a solvent. The washing units 4 and 5 are a second washing unit and a third washing unit, which are rinsing tanks for removing the detergent. In the first embodiment, in the first embodiment, the first washing unit 3 is used to remove the detergent step by step. A second cleaning unit 4 for performing a first rinsing on the printed circuit board 2 washed with a detergent or the like, and a second cleaning on the printed circuit board 2 after the first rinsing in the second cleaning unit 4 A third cleaning unit 5 for rinsing is provided.

Here, the first cleaning section 3 is for cleaning the printed circuit board 2 by spraying a detergent or the like on the printed circuit board 2 and for collecting the detergent or the like sprayed on the printed circuit board 2. It is composed of a tank and the like. Similarly, the second cleaning section 4 and the third cleaning section 5 also include cleaning nozzles 4a and 5a for spraying water on the printed circuit board 2 to rinse the same.
It comprises a tank for collecting water sprayed on the printed circuit board 2 and the like.

Reference numeral 6 denotes a drying unit for blowing out moisture adhering to the printed circuit board 2. The drying unit 6 blows hot air to the printed circuit board 2 to dry it. 6a, etc., the first cleaning unit 3, the second cleaning unit 4, the third cleaning unit 5, and the drying unit 6
Are arranged along the conveyor 1 which is a moving path of the printed circuit board 2.

Reference numeral 7 denotes a city water pure water supply unit. Reference numeral 8 denotes a reverse osmosis membrane provided in the city water pure water supply unit 7 for separating pure water from city water. Is pressurized by the pump 10 and sent to the reverse osmosis membrane 8 to be separated into pure water and concentrated water of city water by an operation described later, and this pure water is mixed with the third washing unit 5 and, if necessary, The first cleaning unit 3 is supplied to the second cleaning unit 4.

Next, a description will be given of a piping route for circulating water between the first washing unit 3, the second washing unit 4, the third washing unit 5, and the city water pure water supply unit 7. . 11 is a pipe connecting between the city water pure water supply unit 7 and the first cleaning unit 3, 12 is a pipe connecting between the city water pure water supply unit 7 and the second cleaning unit 4, 1
Reference numeral 3 denotes a pipe connecting between the city water pure water supply unit 7 and the third washing unit 5, and valves 11a, 12a, and 13a for adjusting the water supply amount are provided in the middle of the pipe. , Pure water is supplied from the city water pure water supply unit 7 to the first washing unit 3 and the second
Is supplied to the cleaning unit 4 and the third cleaning unit 5 in predetermined amounts.

Reference numeral 14 denotes a first reverse osmosis membrane for separating a detergent aqueous solution, which is waste water from the second washing unit 4, into clean water and concentrated water containing detergent, and 15 denotes a second washing unit 4 and a first reverse osmosis membrane. The drainage from the second washing unit 4 is a pipe connecting the reverse osmosis membrane 14
After passing through a filter 16 and a valve 17 provided in the middle of the pipe 15, it is pressurized by a pump 18,
It is sent to the first reverse osmosis membrane 14.

Reference numeral 19 denotes a second reverse osmosis membrane for separating a detergent aqueous solution, which is waste water from the third washing unit 5, into clean water and concentrated water containing a detergent, and reference numeral 20 denotes a third reverse washing unit 5 and a second reverse osmosis membrane. Is connected to the reverse osmosis membrane 19, and the drainage water of the third washing unit 5 is
A filter 21a provided in the middle of the pipe 20,
After passing through the valve 21 b, it is pressurized by the pump 22 and sent to the second reverse osmosis membrane 19.

FIG. 2 is an explanatory view showing the principle of separation of clean water by a reverse osmosis membrane. A semipermeable membrane 100 that allows water to pass through but does not allow salt to pass through is provided at the center of the U-shaped tube.
When 02 is added, the pure water 101 passes through the semipermeable membrane 100 and moves to the saline solution 102 side, and the water level of the saline solution 102 rises (FIG. 2A). The increase in the water level of the salt solution 102 is referred to as an osmotic pressure.
When applied to the 02 side, the water in the salt solution 102 moves to the pure water 101 side (FIG. 2B). The method of separating into clean water and concentrated water according to this principle is called a reverse osmosis method.
00 is called a reverse osmosis membrane. In addition, reverse osmosis membranes have the function of removing salt ions, organic components and fine particles,
The separated clean water becomes “pure water” having low conductivity.

The reverse osmosis membrane 8 of the city water pure water supply unit 7 shown in FIG. 1 separates city water into purified water, which is pure water, and concentrated water of city water according to the principle of FIG. , And pure water is supplied to the first cleaning unit 3, the second cleaning unit 4, and the third cleaning unit 5 by pipes 11, 12, and 13.
And the concentrated water is discharged to the sewer as it is. In addition, the first reverse osmosis membrane 14 and the second reverse osmosis membrane 1
No. 9 also allows the detergent aqueous solution to be separated into clean water and concentrated water containing the detergent according to the principle of FIG.

Reference numeral 23 denotes a pipe connecting between the second reverse osmosis membrane 19 and the third cleaning unit 5, and reference numeral 23 a denotes a valve provided in the middle of the pipe 23, and is separated by the second reverse osmosis membrane 19. The cleaned water thus returned is returned to the third cleaning unit 5 through the pipe 23. As a result, the third cleaning unit 5 has the purified water separated from the purified water from the city water pure water supply unit 7 and the wastewater of the third cleaning unit 5 filtered and separated by the second reverse osmosis membrane 19. Water is to be supplied.

Reference numeral 24 denotes a pipe connecting between the second reverse osmosis membrane 19 and the second cleaning unit 4. The concentrated water separated by the second reverse osmosis membrane 19 is subjected to the second cleaning by the pipe 24. Sent to the section 4. Reference numeral 24a denotes a valve provided in the middle of the pipe 24, and the ON / OFF of water supply from the second reverse osmosis membrane 19 to the second cleaning unit 4 can be adjusted by the valve 24a. Here, in the second reverse osmosis membrane 19, it is necessary to prevent clogging of the reverse osmosis membrane by appropriately discharging the concentrated water to prevent a decrease in the capacity.
In addition to the normal water supply path provided by the valve 4 and the valve 24a, a pipe 24c provided with a flow meter 24b serving as a separate path from the valve 24a is provided. A sensor and a moisture meter sensor are provided to intermittently concentrate from the pipe 24c side by using the case where a large amount of concentrated water can be sent, such as when the liquid level drops and the concentration of detergent is low, according to the detection result here. I try to send water. In addition, a pipe 24d is provided as a circulation path for returning the concentrated water of the second reverse osmosis membrane 19 to the second reverse osmosis membrane 19 again in order to correspond to the water amount required in each part.

Reference numeral 25 denotes a pipe connecting between the first reverse osmosis membrane 14 and the second washing unit 4, and reference numeral 25 a denotes a valve provided in the middle of the pipe 25, which is separated by the first reverse osmosis membrane 14. The cleaned water thus returned is returned to the second cleaning unit 4 by the pipe 25. Reference numeral 26 is provided with an oil-water separation membrane for separating concentrated water containing detergent, which is waste water of the first reverse osmosis membrane 14, into water whose concentration of oil (detergent) is suppressed to a certain level or less, and detergent. The oil / water separation unit 27 is a pipe connecting between the first reverse osmosis membrane 14 and the oil / water separation unit 26,
A part of the concentrated water separated by the reverse osmosis membrane 14 is sent to the oil / water separation unit 26 through the pipe 27.

FIG. 3 is an explanatory view showing the structure of the oil / water separation unit 26 and the principle of separation of detergent (oil) and water by the oil / water separation membrane constituting the oil / water separation unit 26. In general, when an aqueous solution of a polyethylene glycol type nonionic surfactant is heated and the temperature rises, the hydrophilicity gradually decreases because the bound water molecules gradually come off accordingly. The surfactant precipitates as fine droplets and the initially clear solution becomes a cloudy emulsion. This temperature at which precipitation occurs is called the cloud point.

Here, the oil / water separation unit 26 is provided as shown in FIG.
As shown in (a), a stock solution inlet 28 for taking in concentrated water containing a detergent, which is the drainage of the first reverse osmosis membrane 14, an oil / water separation membrane 29 to which the concentrated water taken in from the stock solution inlet 28 is fed. A tank 30 for storing the detergent (oil) and water passing through the oil-water separation membrane 29, an oil outlet 31 for extracting oil from the tank 30, a water outlet 32 for extracting water from the tank 30, a heater (not shown), and the like. Have been.

The concentrated water sent to the oil / water separation unit 26 still contains a large amount of detergent (oil) in which the flux is dissolved, and the concentrated water is supplied from the stock solution inlet 28 to raise the temperature to the cloud point. When the temperature is further increased, most of the surfactant precipitates, and when the liquid is passed through the oil-water separation membrane 29, the surfactant is shown in FIG. Thus, the oil droplets are captured by the oil-water separation membrane 29 and aggregate. The aggregated oil droplets grow and become coarse and grow to about 1 mmφ, and as shown in FIG. 3C, are released from the oil-water separation membrane 29 due to the flow resistance, and the oil component and the water are separated. This is called oil-water separation,
In the tank 30, the oil 33 having a low specific gravity accumulates on the upper side of the tank 30, and the water 34 in which the oil content is suppressed below a certain level accumulates on the lower side of the tank 30. Thereby, the oil is discharged from the oil outlet 31 above the tank 30 and the water is discharged from the water outlet 32 below the tank 30, the oil is discharged to the waste liquid tank 35 shown in FIG. Returned to 4.

That is, reference numeral 36 denotes a pipe connecting between the oil / water separation unit 26 and the second washing section 4, and 36a denotes a valve provided in the middle of the pipe 36, and the clean water separated by the oil / water separation unit 26 is The water is sent to the second cleaning unit 4 by the pipe 36. As a result, the second cleaning unit 4 includes pure water from the city water pure water supply unit 7, concentrated water separated from the wastewater from the third cleaning unit 5 by the second reverse osmosis membrane 19, The clean water separated by filtering the wastewater of the second washing unit 4 itself by the first reverse osmosis membrane 14 and the concentrated water separated by the second reverse osmosis membrane 19 from the wastewater of the second washing unit 4 itself And the purified water filtered by the oil / water separation unit 26 to be supplied.

It should be noted that overflow water generated when the liquid level of the third cleaning unit 5 overflows flows into the second cleaning unit 4. 37 is the first reverse osmosis membrane 14 and the first cleaning unit 3
The concentrated water separated by the first reverse osmosis membrane 14 is sent to the first washing unit 3 by the pipe 37. Reference numeral 37a denotes a valve provided in the middle of the pipe 37, and the ON / OFF of water supply from the first reverse osmosis membrane 14 to the first cleaning unit 3 can be adjusted by the valve 37a. Here, in the first reverse osmosis membrane 14, it is necessary to prevent clogging of the reverse osmosis membrane by appropriately discharging the concentrated water to prevent a decrease in capacity.
In addition to the normal water supply path by the valve 7 and the valve 37a, a pipe 37c provided with a flow meter 37b serving as a separate path from the valve 37a is provided. A sensor and a moisture meter sensor are provided, and the concentration is intermittently increased from the pipe 37c side by utilizing a case where a large amount of concentrated water can be sent, such as when the liquid level is lowered and the concentration of the detergent is low, according to the detection result. I try to send water. A pipe 37d is provided as a circulation path for returning the concentrated water of the first reverse osmosis membrane 14 to the first reverse osmosis membrane 14 again in order to correspond to the amount of water required in each part.

As a result, pure water from the city water pure water supply unit 7 and concentrated water separated from the waste water of the second cleaning unit 4 by the first reverse osmosis membrane 14 are supplied to the first washing unit 3. Is to be supplied. 38 is a detergent tank, 39 is a pipe connecting between the detergent tank 38 and the first washing unit 3,
Reference numeral 39a denotes a valve provided in the pipe 39, and a detergent is supplied to the first washing unit 3 from the detergent tank 38 as needed.

Reference numeral 40 denotes a pipe connecting between the first cleaning unit 3 and the waste liquid tank 35, and reference numeral 40a denotes a valve provided in the pipe 40.
Sent to 5. Further, reference numeral 41 denotes a pipe connecting between the oil-water separation unit 26 and the waste liquid tank 35, and as described above, the oil component (detergent component) separated by the oil-water separation unit 26.
Is sent to the waste liquid tank 35 by the pipe 41. The oil fed into the waste liquid tank 35 is processed after being temporarily stored.

Here, the first cleaning unit 3 and the second cleaning unit 4
Between the second cleaning unit 4 and the third cleaning unit 5 and between the third cleaning unit 5 and the drying unit 6 by blowing air or the like onto the printed circuit board 2 for printing. Drain nozzles 42a, 42 for blowing off liquid adhering to circuit board 2
b, 42c are provided. Next, a flow of processing in the flux cleaning apparatus of the first embodiment having the above configuration will be described.

Here, the supply of pure water from the city water pure water supply unit 7 is usually performed to the third washing unit 5, and the supply of the pure water from the city water pure water supply unit 7 is performed as necessary. The valve 7a is opened to supply pure water to the first cleaning unit 3 and the second cleaning unit 4. When the power is turned on by a control switch (not shown), the conveyor 1 starts to move, whereby the printed circuit board 2 which is the object to be cleaned is turned on, and first enters the first cleaning unit 3.

The printed circuit board 2 is provided with a cleaning nozzle 3
a, the liquid adhering to the printed circuit board 2 is blown off by the air spouted from the liquid drain nozzle 42a, and enters the second washing unit 4. In the second cleaning unit 4, as described above,
Clean water separated by filtering the water used for washing in the second washing section 4 itself with the first reverse osmosis membrane 14, the first reverse osmosis membrane 14
Using the concentrated water separated by the oil-water separation unit 26 by filtration and the concentrated water separated by the second reverse osmosis membrane 19 from the water used for washing in the third washing unit 5, Water from each of the above paths is jetted out of the washing nozzle 4a in a shower shape to wash the printed circuit board 2 and perform a first rinsing.

Thereafter, the liquid adhering to the printed circuit board 2 is blown off by the air jetted from the liquid drain nozzle 42b, and then sent to the third cleaning unit 5. Here, pure water from the city water pure water supply unit 7 and clean water separated by filtering the water used for washing in the third washing unit 5 itself with the second reverse osmosis membrane 19 are separated from the washing nozzle 5a. The printed circuit board 2 is blown off and washed, and a second rinsing is performed.

After the liquid is further blown off by the liquid discharge nozzle 42c, the printed circuit board 2 is sent to the drying unit 6. In the drying section 6, warm air is blown out from the warm air outlet 6a, and the printed circuit board 2 is dried. In addition,
The amount and concentration of the cleaning liquid used in the first cleaning unit 3, the second cleaning unit 4, and the third cleaning unit 5 can be arbitrarily set by adjusting a valve provided in each pipe.
The drying time can also be arbitrarily set by adjusting the amount of hot air blown out in the drying unit 6.

Here, the first cleaning section 3 is a cleaning tank to which a detergent is supplied, and the replenishment of the amount taken out by the printed circuit board 2 or discharged from the duct as a splash at the time of showering is shown in FIG. This is performed by replenishing the detergent from the detergent tank 38 by detecting a decrease in the detergent based on the signal of the liquid level sensor that does not perform the cleaning. Then, the flux is washed off and dissolved in the detergent. However, the flux in the detergent does not increase to a certain level or more because a new detergent is intermittently replenished with respect to the carry-out amount.

The detergent is not flammable if a certain amount of water is mixed therein.
The concentration of the water in the detergent is constantly checked from the output of the moisture meter sensor provided in the second cleaning unit, and the concentrated water separated from the waste water of the second washing unit 4 by the first reverse osmosis membrane 14 is turned on by the valve 37a. While supplying a constant amount of water, when the water content reaches a predetermined ratio or less, the concentrated water is intermittently supplied from the pipe 37c side.

FIG. 4 is a block diagram showing a configuration and a processing flow of a flux cleaning apparatus according to a second embodiment of the present invention. In the second embodiment, a second cleaning unit for cleaning a printed circuit board immediately after cleaning with a detergent is added by adding one cleaning unit in order to increase the cleaning performance as compared with the apparatus of the first embodiment. The cleaning of the rinsing water is performed only by the oil-water separation membrane, and the reverse osmosis membrane is separately arranged in each of the third cleaning unit and the fourth cleaning unit, which perform the subsequent cleaning, to cope with the rinsing water cleaning. Things.

That is, in the drawing, reference numeral 51 denotes a conveyor constituting a moving path of a printed circuit board 52 to be cleaned, and 53 denotes a cleaning tank for washing the flux adhering to the printed circuit board 52 with a detergent or a solvent. Are first, second, third and fourth washing units, which are rinsing tanks for removing the detergent. In the second embodiment, the first cleaning unit 53 performs a first rinse on the printed circuit board 52 that has been cleaned with a detergent or the like, and the second cleaning unit 54 performs a first rinse. Cleaning section 55 for rinsing the printed circuit board 52 for the second time for which cleaning has been completed
And a third cleaning unit 56 that performs a third rinse on the printed circuit board 52 that has been subjected to the second rinse in the third cleaning unit 55.

Here, the first cleaning section 53 is for cleaning the printed circuit board 52 by spraying a detergent or the like on the printed circuit board 52 and for collecting the detergent or the like sprayed on the printed circuit board 52. It is composed of a tank and the like. Also,
Similarly, the second cleaning section 54, the third cleaning section 55, and the fourth cleaning section 56 include cleaning nozzles 54a, 55a, 56a for spraying water on the printed circuit board 52 to rinse the printed circuit board 52, and the printed circuit board 52. It is composed of a tank and the like for collecting water sprayed on the water.

Reference numeral 57 denotes a drying unit for blowing out moisture adhering to the printed circuit board 52. The drying unit 57 blows hot air to the printed circuit board 52 to dry it. 57a and the like, the first cleaning unit 53, the second cleaning unit 54, and the third cleaning unit 5
5, a fourth cleaning unit 56 and a drying unit 57 are arranged along the conveyor 51 which is a moving path of the printed circuit board 52.

Reference numeral 58 denotes a city water pure water supply unit, and 59 denotes a reverse osmosis membrane provided in the city water pure water supply unit 58 for separating pure water from the city water. Is supplied to the reverse osmosis membrane 59 by being pressurized by the pump 60b,
The pure water and the concentrated water of city water are separated by the operation of FIG. 2 described in the first embodiment, and the pure water is separated into the first cleaning unit 53 and the second cleaning unit 53.
Cleaning section 54, third cleaning section 55, and fourth cleaning section 5
6 supplied. The concentrated water is drained to the sewer as it is.

Next, the first cleaning unit 53 and the second cleaning unit 5
A description will be given of a piping route for circulating water among the fourth, third cleaning unit 55, fourth cleaning unit 56, and city water pure water supply unit 58. 61 is a city water pure water supply unit 58 and a first cleaning unit 53
62 is the city water pure water supply unit 58 and the second
A pipe connecting between the city water pure water supply unit 58 and the third cleaning unit 55; a pipe 64 connecting the city water pure water supply unit 58 and the fourth cleaning unit 56; And valves 61a, 62a, 63a, 64a for adjusting the amount of supplied water are provided in the middle of the pipes, and pure water is supplied from the city water pure water supply unit 58 to the first The cleaning unit 53, the second cleaning unit 54, the third cleaning unit 55, and the fourth cleaning unit 56 are supplied in predetermined amounts.

Reference numeral 65 denotes an oil / water separation unit for separating the aqueous detergent solution, which is the waste water of the second washing section 54, into oil and water whose oil content is suppressed to a certain level or less. This oil / water separation unit 65 is of the first embodiment. The oil and moisture are separated by the same operation as that described with reference to FIG. 66 and 67 are second cleaning units 54
The drainage of the second washing unit 54 is connected to the oil-water separation unit 6 by a pipe 66.
The water separated by the oil / water separation unit 65 is returned to the second cleaning unit 54 by a pipe 67. 68 is a waste liquid tank, 69 is a pipe connecting the waste liquid tank 68 and the oil / water separation unit 65, and the oil separated by the oil / water separation unit 65 is sent to the waste liquid tank 68 via the pipe 69.

Reference numeral 70 denotes a first reverse osmosis membrane for separating a detergent aqueous solution, which is waste water of the third washing unit 55, into clean water and concentrated water containing a detergent, and 71 denotes a third washing unit 55 and a first reverse osmosis membrane. The drainage water of the third washing unit 55 is pressurized by a pump 71a and sent to the first reverse osmosis membrane 70 by a pipe connecting the reverse osmosis membrane 70 to the first reverse osmosis membrane 70. Reference numeral 72 denotes a second reverse osmosis membrane for separating the aqueous detergent solution, which is waste water from the fourth cleaning unit 56, into clean water and concentrated water containing detergent, and 73 denotes a fourth reverse cleaning unit 56 and the second reverse osmosis membrane. The drainage from the fourth cleaning unit 56 is pressurized by a pump 73 a and sent to the second reverse osmosis membrane 72 by a pipe connecting the membrane 72. Note that the first reverse osmosis membrane 70 and the second reverse osmosis membrane 72 are the same as those in the first embodiment shown in FIG.
By the same operation as described above, the detergent aqueous solution is separated into clean water and concentrated water containing detergent.

Reference numeral 74 denotes a pipe connecting between the second reverse osmosis membrane 72 and the fourth cleaning unit 56, and reference numeral 74a denotes a valve provided in the middle of the pipe 74, which is separated by the second reverse osmosis membrane 72. The cleaned water is supplied to the fourth cleaning unit 56 by the pipe 74.
Is returned to. As a result, the fourth cleaning unit 56 has the purified water separated from the purified water from the city water pure water supply unit 58 and the wastewater of the fourth cleaning unit 56 filtered and separated by the second reverse osmosis membrane 72. Water is to be supplied.

Reference numeral 75 denotes a pipe connecting between the first reverse osmosis membrane 70 and the third cleaning unit 55, and reference numeral 75a denotes a valve provided in the middle of the pipe 75, which is separated by the first reverse osmosis membrane 70. The cleaned water is supplied to the third cleaning unit 55 by the pipe 75.
Is returned to. As a result, the third cleaning unit 55 has the purified water separated from the purified water from the city water pure water supply unit 58 and the wastewater of the third cleaning unit 55 filtered by the first reverse osmosis membrane 70. Water is to be supplied. Note that overflow water generated when the liquid level of the fourth cleaning unit 56 overflows flows into the third cleaning unit 55.

Reference numeral 76 denotes a portion between the second reverse osmosis membrane 72 and the second cleaning section 54 and between the second reverse osmosis membrane 72 and the first cleaning section 5.
3 is connected between the first reverse osmosis membrane 70 and the second cleaning section 54 and between the first reverse osmosis membrane 70 and the first
Pipe connecting the cleaning section 53 of the
In addition to the pure water from the above-mentioned city water pure water supply unit 58 and the clean water separated by filtering the waste water of the second washing unit 54 itself with the oil / water separation unit 65, The concentrated water separated by the first reverse osmosis membrane 70 from the wastewater of the washing unit 55 and the concentrated water separated by the second reverse osmosis membrane 72 from the wastewater of the fourth washing unit 56 are supplied. The first reverse osmosis membrane 78 supplied to the second cleaning section 54 and the second 78
This is a valve for adjusting ON / OFF of the supply of the concentrated water from the reverse osmosis membrane 72.

Further, in the first reverse osmosis membrane 70 and the second reverse osmosis membrane 72, it is necessary to prevent the reverse osmosis membrane from being clogged by appropriately discharging the concentrated water and to prevent a decrease in performance. In addition, in addition to the normal water supply path provided by the pipes 76 and 77 and the valve 78a, a pipe 77a provided with a flow meter 78b serving as a separate path from the valve 78a is provided. Is provided with a liquid level sensor and a moisture meter sensor which are not shown in the drawing. To send concentrated water intermittently. Further, in order to cope with the amount of water required in each part, the pipe 76a as a circulation path for returning the concentrated water of the second reverse osmosis membrane 72 to the second reverse osmosis membrane 72 again and the first reverse osmosis membrane 70 A pipe 77b is provided as a circulation path for returning the concentrated water to the first reverse osmosis membrane 70 again.

Reference numeral 79 denotes a detergent tank, 80 denotes a pipe connecting the detergent tank 79 and the first cleaning section 53, and 80a denotes a valve provided in the pipe 80.
From 9, the detergent is supplied to the first cleaning unit 53 as needed, whereby the first cleaning unit 53 is supplied.
The pure water from the city water pure water supply unit 58, the concentrated water separated by the first reverse osmosis membrane 70 from the wastewater from the third washing unit 55, and the purified water from the wastewater from the fourth washing unit 56 The concentrated water separated by the second reverse osmosis membrane 72 and the detergent from the detergent tank 79 are supplied. Reference numeral 81a denotes a valve for adjusting ON / OFF of the supply of the concentrated water from the first reverse osmosis membrane 70 and the second reverse osmosis membrane 72 supplied to the first cleaning unit 53.

As described above, the first reverse osmosis membrane 7
In the 0, 2nd reverse osmosis membrane 72, it is necessary to prevent the clogging of the reverse osmosis membrane by appropriately discharging the concentrated water and to prevent a decrease in capacity.
In addition to the normal water supply path by a, a pipe 77c provided with a flow meter 81b which is a separate path from the valve 81a is provided. Further, a liquid level sensor and a moisture meter (not shown) are provided in the first cleaning unit 53. A sensor is provided, and the concentrated water is sent intermittently from the pipe 77c side by using a case where a large amount of the concentrated water can be sent, such as a case where the liquid level is lowered and the concentration of the detergent is low, according to the detection result here. I have to.

In the first cleaning section 53, since the detergent is not flammable when a certain amount of water is mixed in the detergent, the ratio of moisture in the detergent is constantly checked from the output of the moisture meter sensor. The concentrated water separated by the first reverse osmosis membrane 70 from the wastewater of the third washing unit 55 and the concentrated water separated by the second reverse osmosis membrane 72 from the wastewater of the fourth washing unit 56 are supplied to the valve 8.
While supplying a fixed amount of water while turning 1a ON, the concentrated water is intermittently replenished from the pipe 77c side when the water content reaches a certain ratio or less.

Reference numeral 82 denotes a pipe connecting between the first cleaning unit 53 and the waste liquid tank 68, and reference numeral 82a denotes a valve provided in the pipe 82. The drain of the first cleaning unit 53 is sent to the waste liquid tank 68. Can be Here, between the first cleaning section 53 and the second cleaning section 54, the second cleaning section 54 and the third cleaning section 5 are provided.
5, between the third cleaning unit 55 and the fourth cleaning unit 56, and between the fourth cleaning unit 56 and the drying unit 57.
Drain nozzles 83a, 83b, 83c and 83d are provided for blowing air or the like onto the printed circuit board 52 to blow off liquid adhering to the printed circuit board 52.

Next, the flow of processing in the flux cleaning apparatus of the second embodiment having the above configuration will be described. Here, the supply of pure water from the city water pure water supply unit 58 is normally performed to the fourth cleaning unit 56, and the valve 58a of the city water pure water supply unit 58 is operated as necessary. Open the first cleaning unit 5
3. The pure water is supplied to the second cleaning unit 54 and the third cleaning unit 55.

When the power is turned on by a control switch (not shown), the conveyor 51 starts to move, whereby the printed circuit board 52, which is the object to be cleaned, is loaded and firstly enters the first cleaning section 53. Here, the printed circuit board 52 is washed with a detergent or the like ejected from the washing nozzle 53a in a shower shape, and then the liquid attached to the printed circuit board 52 is blown off by the air ejected from the liquid discharge nozzle 83a.
The second cleaning unit 54 is entered.

In the second cleaning section 54, as described above,
Clean water separated by filtering the water used for washing in the second washing section 54 itself with the oil-water separation unit 65, the third washing section 5
The concentrated water separated by the first reverse osmosis membrane 70 from the water used for the washing in 5 and the concentrated water separated by the second reverse osmosis membrane 72 from the water used for the washing in the fourth washing unit 56 are used. hand,
Water from each of the above paths is jetted out of the washing nozzle 54a in a shower shape to wash the printed circuit board 52 and perform a first rinsing.

Thereafter, the liquid adhering to the printed circuit board 52 is blown off by the air blown out from the liquid discharge nozzle 83b and then sent to the third cleaning section 55. Here, the pure water from the city water pure water supply unit 58 and the third cleaning unit 5
The water used for washing by itself 5 is filtered through the first reverse osmosis membrane 70 and the separated clean water is jetted from the washing nozzle 55a to wash the printed circuit board 52, and the second rinsing is performed.

Thereafter, the liquid adhering to the printed circuit board 52 is blown off by the air blown out from the liquid discharge nozzle 83c, and then sent to the fourth cleaning section 56. Here, the pure water from the city water pure water supply unit 58 and the fourth cleaning unit 5
The water used for cleaning by itself is filtered through the second reverse osmosis membrane 72, and the separated clean water is jetted from the cleaning nozzle 56a to wash the printed circuit board 52, and the third rinsing is performed.

After the liquid is further blown off by the liquid discharge nozzle 83d, the printed circuit board 52 is sent to the drying unit 57. In the drying section 57, the warm air is blown out from the warm air blowout port 57a, and the printed circuit board 52 is dried. The first cleaning unit 53, the second cleaning unit 54,
The amount and concentration of the cleaning liquid used in the third cleaning unit 55 and the fourth cleaning unit 56 can be arbitrarily set by adjusting a valve provided in each pipe. It can be set arbitrarily by adjusting the blowing amount of hot air.

The replenishment of the detergent and the replenishment of water in the first cleaning section 53 are performed in the same manner as in the first embodiment. FIG. 5 is a block diagram showing a configuration and a processing flow of a flux cleaning apparatus according to a third embodiment of the present invention. In the third embodiment, as in the second embodiment, a four-tank structure in which one tank for cleaning with a detergent and three tanks for rinsing are provided is provided. In comparison with the improvement of the cleaning ability, the cleaning of the rinse water in the second cleaning section for cleaning the printed circuit board immediately after the cleaning with the detergent is performed only by the oil-water separation membrane, and the third cleaning is performed thereafter. The washing unit and the fourth washing unit are combined to purify the rinse water with a reverse osmosis membrane. The rinse water in the third washing unit is passed through the reverse osmosis membrane and separated into clean water and concentrated water. By circulating and supplying the clean water to the fourth cleaning unit and the concentrated water to the first washing unit and the second washing unit as a water supply, respectively, the concentration control and the water management of each tank are maintained, and the waste liquid amount is reduced. It is designed to keep it to a minimum. By reducing the number of relatively expensive reverse osmosis membranes, an increase in cost is suppressed as compared with the apparatus of the second embodiment.

In the following, the first cleaning section 53, the second cleaning section 54, the third cleaning section 55, the fourth cleaning section 56, and the city water pure water supply section 58 in the third embodiment will be described. The piping route for circulating water will be described below. The same components as those in the second embodiment described above are denoted by the same reference numerals,
The description is omitted. 84 is a reverse osmosis membrane for separating the aqueous detergent solution, which is the waste water of the third washing section 55, into clean water and concentrated water containing detergent, and 85 is a section between the third washing section 55 and the reverse osmosis membrane 84. In the connecting pipe, the drainage water of the third cleaning unit 55 is pressurized by the pump 85a and sent to the reverse osmosis membrane 84. The reverse osmosis membrane 84 separates the aqueous detergent solution into clean water and concentrated water containing the detergent by the same operation as that described in FIG. 2 of the first embodiment. The third cleaning unit 55 includes a fourth cleaning unit 56.
The overflow water when the liquid level overflows is also introduced, so that in the third cleaning unit 55, in addition to the clean water from the city water pure water supply unit 58, the liquid level of the fourth cleaning unit 56 The overflow water at the time of overflow is also supplied.

Reference numeral 86 denotes a pipe connecting between the reverse osmosis membrane 84 and the fourth cleaning unit 56, and reference numeral 86a denotes a valve provided in the middle of the pipe 86. The clean water separated by the reverse osmosis membrane 84 is The water is sent to the fourth cleaning unit 56 through the pipe 86.
As a result, the fourth cleaning unit 56 includes the city water pure water supply unit 5.
8 and the clean water separated by filtering the wastewater from the third washing section 55 through the reverse osmosis membrane 84.

Reference numeral 87 denotes a pipe connecting between the reverse osmosis membrane 84 and the first cleaning section 53 and between the reverse osmosis membrane 84 and the second cleaning section 54. In addition to the clean water from the city water pure water supply unit 58 and the clean water separated by filtering the waste water of the second washing unit 54 itself with the oil-water separation unit 65, the waste water of the third washing unit 55 is reversed. Osmosis membrane 84
Is supplied. Reference numeral 88a denotes a valve for adjusting ON / OFF of the supply of the concentrated water from the reverse osmosis membrane 84 supplied to the second cleaning unit 54. In addition, a pipe 87a is provided as a circulation path for returning the concentrated water of the reverse osmosis membrane 84 to the reverse osmosis membrane 84 again in order to correspond to the amount of water required in each part.

The first washing unit 53 includes purified water from the city water pure water supply unit 58, concentrated water separated from the wastewater from the third washing unit 55 by the reverse osmosis membrane 84, and a detergent tank. Detergent from 79 is to be supplied. In addition, 89a
Is a valve for adjusting ON / OFF of the supply of the concentrated water from the reverse osmosis membrane 84 supplied to the first cleaning section 53.

Here, in the reverse osmosis membrane 84, it is necessary to prevent the clogging of the reverse osmosis membrane by appropriately discharging the concentrated water to prevent a decrease in capacity. In addition to the normal water supply path to the second cleaning unit 54 and the normal water supply path to the first cleaning unit 53 by the pipe 87 and the valve 89a, a pipe provided with a flow meter 88b serving as a separate path from the valve 88a. 88c and the valve 89
a pipe 89c provided with a flow meter 89b serving as a path different from the path a
Are provided, and a liquid level sensor and a moisture meter sensor (not shown) are provided in the first cleaning section 53 and the second cleaning section 54, and the liquid level is lowered according to the detection result here, and The concentrated water is sent intermittently from the pipes 88c and 89c by utilizing the case where a large amount of the concentrated water can be sent, such as when the concentration of the detergent is low.

Further, in the first cleaning section 53, the detergent is not flammable if a certain amount of moisture is mixed in the detergent. Therefore, the ratio of moisture in the detergent is constantly checked from the output of the moisture meter sensor. The reverse osmosis membrane 8
While supplying a certain amount of the concentrated water separated in step 4 with the valve 89a being in the ON state, when the water content reaches a certain ratio or less, the pipe 89
Concentrated water is supplied intermittently from the c side.

Next, the flow of processing in the flux cleaning apparatus of the third embodiment having the above configuration will be described. Here, the supply of pure water from the city water pure water supply unit 58 is normally performed to the fourth cleaning unit 56, and the valve 58a of the city water pure water supply unit 58 is operated as necessary. Open the first cleaning unit 5
3. The pure water is supplied to the second cleaning unit 54 and the third cleaning unit 55.

When the power is turned on by a control switch (not shown), the conveyor 51 starts to move, whereby the printed circuit board 52, which is an object to be cleaned, is loaded. Here, the printed circuit board 52 is washed with a detergent or the like ejected from the washing nozzle 53a in a shower shape, and then the liquid attached to the printed circuit board 52 is blown off by the air ejected from the liquid discharge nozzle 83a.
The second cleaning unit 54 is entered.

In the second cleaning section 54, as described above,
Clean water separated by filtering the water used for washing in the second washing section 54 itself with the oil-water separation unit 65, the third washing section 5
Using the concentrated water separated by the reverse osmosis membrane 84 from the water used for cleaning in step 5, the water from each of the above paths is separated from the cleaning nozzle 54a
, The printed circuit board 52 is washed, and the first rinsing is performed.

Thereafter, the liquid adhering to the printed circuit board 52 is blown off by the air jetted from the liquid drain nozzle 83b, and then sent to the third cleaning unit 55. Here, clean water from the city water pure water supply unit 58 is supplied to the cleaning nozzle 55.
The printed circuit board 52 is washed by being ejected from a, and a second rinsing is performed. Thereafter, the liquid adhering to the printed circuit board 52 is blown off by the air jetted from the liquid drain nozzle 83c, and then sent to the fourth cleaning unit 56.

Here, the pure water from the city water pure water supply unit 58 and the water used for cleaning in the third cleaning unit 55 are mixed with the reverse osmosis membrane 8.
The clean water filtered and separated in step 4 is jetted from the washing nozzle 56a to wash the printed circuit board 52, and the third rinsing is performed. Further, after the liquid is blown off by the liquid discharge nozzle 83d, the printed circuit board 52 is sent to the drying unit 57.

In the drying section 57, warm air is blown out from the warm air outlet 57a, and the printed circuit board 52 is dried. The first cleaning unit 53 and the second cleaning unit 5
4, the amount and concentration of the cleaning liquid used in the third cleaning section 55 and the fourth cleaning section 56 can be arbitrarily set by adjusting valves provided in each pipe, and the drying time is also set in the drying section. It can be set arbitrarily by adjusting the amount of hot air blowout at 57.

The supply of the detergent and the supply of water in the first cleaning section 53 are performed in the same manner as in the first embodiment. In the first to third embodiments, the reverse osmosis membrane is 40 ° C. or more and 70 ° C. in consideration of the temperature of the washing solution and the washing water.
By using a special reverse osmosis membrane for high temperature that can withstand up to the maximum, its replacement life can be improved.

[0075]

As described above, according to the present invention, in the rinse washing section provided immediately after the detergent washing section, the aqueous detergent solution generated by washing is recovered, and this is used by the oil-water separation membrane. The water is separated into oil and water, and the water and the concentrated water separated by the reverse osmosis membrane from the aqueous detergent solution recovered in the subsequent rinse cleaning section are used as cleaning water, and the rinse provided immediately after the detergent cleaning section is used. In the rinsing washing section after the washing section, the detergent aqueous solution generated by washing is collected,
This is separated into pure water and concentrated water containing detergent using a reverse osmosis membrane, and this pure water is returned to the rinsing section where the aqueous detergent solution is collected and used as washing water. This has the effect of reducing the amount of external pure water supplied from outside without reducing the cleaning capacity.

Further, a detergent aqueous solution generated by washing is recovered, and the reverse osmosis membrane separates this into pure water and concentrated water containing detergent, and circulates and reuses both to recycle oil-water separation. Since the water separated by the membrane is also circulated and reused, and only the separated oil is discharged, the effect of minimizing the amount of final waste liquid that is a product of the pure water regeneration process can be minimized. Have.

Further, the concentrated water separated by the reverse osmosis membrane after recovering the detergent aqueous solution generated at the time of washing from the rinse washing section is supplied to the detergent washing section and the rinse washing section preceding the rinse washing section from which the aqueous detergent solution was collected. Is supplied to the washing water in the detergent washing section and the rinsing washing section because one of the supply paths is a path for supplying a fixed amount and the other is a path for intermittent supply. The amount of concentrated water containing detergent can be adjusted and supplied in consideration of the concentration of detergent, etc.
This has the effect of extending the life of the reverse osmosis membrane.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration and a processing flow of a flux cleaning apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the principle of separation of clean water by a reverse osmosis membrane.

FIG. 3 is an explanatory diagram showing a configuration of an oil / water separation unit and a principle of separating oil and water by an oil / water separation membrane.

FIG. 4 is a block diagram illustrating a configuration and a processing flow of a flux cleaning apparatus according to a second embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration and a processing flow of a flux cleaning apparatus according to a third embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a configuration of a conventional flux cleaning device.

[Explanation of symbols]

 3 1st washing | cleaning part 4 2nd washing | cleaning part 5 3rd washing | cleaning part 14 1st reverse osmosis membrane 19 2nd reverse osmosis membrane 26 Oil-water separation unit

Continuation of the front page (72) Inventor Hideo Takagusagi 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (56) References JP-A-5-267266 (JP, A) JP-A-1- 292892 (JP, A) JP-A-58-213495 (JP, A) JP-A-57-136909 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H05K 3/10-3 / 26 B01D 17/00-17/12 B08B 3/00-3/14

Claims (2)

(57) [Claims] 1. A detergent washing section for washing a flux adhered to a printed circuit board with a detergent, and a printed circuit board having passed through the detergent washing section is washed with water in a stage subsequent to the detergent washing section to gradually remove the detergent. In a flux cleaning apparatus provided with a plurality of rinse cleaning sections, the detergent aqueous solution collected from the rinse cleaning section has an oil content and an oil content below a certain level corresponding to the rinse cleaning section provided immediately after the detergent cleaning section. Separation means consisting of an oil-water separation membrane that separates moisture into water that has been reduced to a minimum.The separated water is returned to the rinsing washing section where the detergent aqueous solution is collected and used again as washing water. And one or more of a plurality of rinsing sections are selected, and the detergent aqueous solution collected from the rinsing sections is purified water. Filtration means comprising a reverse osmosis membrane that separates into concentrated water containing detergent, and the separated concentrated water is sent to the rinse washing section and the detergent washing section preceding the rinse washing section in which the aqueous detergent solution was collected for washing. Use as water,
A flux cleaning apparatus, comprising: a pipe route for returning clean water to a rinse cleaning section in which an aqueous detergent solution is collected and using the pipe as cleaning water. 2. The flux cleaning apparatus according to claim 1, wherein the concentrated water separated by the filtering means is provided with two pipe routes for rinsing and a detergent cleaning section, and one of the pipes supplies a fixed amount of concentrated water. A flux cleaning apparatus, wherein the other path is a path for intermittently supplying concentrated water.