JPH08290133A - Aqueous cleaner and aqueous cleaning method - Google Patents

Abstract

PURPOSE: To ultrasonically clean even the inmost place such as joint by evacuating a vacuum vessel to boil a cleaning soln. and a rinse and stripping off the contaminant of a work with the generated bubble. CONSTITUTION: A work W is transferred above a vacuum vessel 1 by a transfer device 90, a closing lid 2 is opened, and the work is placed into the vessel 1. The lid 2 is closed, a solenoid valve 12 is opened, and a cleaning soln. in injected into the vessel 1 from a cleaning soln. storage tank 10 by a pump 11. The upper space of the vessel 1 above the cleaning soln. is then evacuated by a vacuum pump 3. Consequently, the cleaning soln. is boiled, the generated small bubbles are allowed to act on the work W to strip off the oil on the work W. The stripped oil is floated up on the surface of the cleaning soln. and separated. After the lapse of a specified time, e.g. about 2min, the vessel 1 is returned to normal pressure by the vacuum pump 3, the deficiency of the cleaning soln. due to vaporization is replenished, and the process is repeated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous cleaning apparatus and an aqueous cleaning method.

[0002]

2. Description of the Related Art In the conventional water-based cleaning, generally, a work is put into a cleaning liquid in a cleaning tank equipped with an ultrasonic oscillator to perform ultrasonic cleaning, and then a rinse liquid in a rinse tank equipped with the ultrasonic oscillator. A work was put inside and ultrasonic rinsing was performed.

[0003]

However, such conventional water-based cleaning has a problem in that the work is damaged by cavitation generated during ultrasonic oscillation. Also, if the workpiece is a precision-processed metal product with a seam structure or a bag hole structure, ultrasonic cleaning does not transmit ultrasonic vibrations to deep areas such as the seam structure or bag hole structure. There was a problem that I could not do enough. Further, there is a problem that the oil removed from the work due to ultrasonic vibration is dissolved in the cleaning liquid and the cleaning liquid is emulsified, which shortens the life of the cleaning liquid. An object of the present invention is to provide a water-based cleaning device and a water-based cleaning method that solve such problems.

[0004]

In order to achieve the above object, in the present invention, the cleaning liquid in the work and the cleaning liquid storage tank is put in a decompression tank, and the decompression tank is decompressed by a decompression pump to boil the cleaning liquid. The work is washed, then the cleaning liquid in the decompression tank is transferred to the cleaning liquid storage tank, the rinse liquid in the rinse liquid storage tank is put in the decompression tank, and the decompression tank is decompressed by the decompression pump. It is characterized in that the work is rinsed by boiling the rinse liquid.

[0005]

Therefore, by depressurizing the decompression tank to boil the cleaning liquid and the rinse liquid, stains on the work are removed by the bubbles generated. In addition, since the boiling of the cleaning liquid or the rinse liquid is the same even in the place of the joint structure or the bag hole structure of the precision machined parts, such a deep space can be sufficiently cleaned.

[0006]

Embodiments of the present invention will be described below. FIG. 1 shows an embodiment of the water-based cleaning apparatus of the present invention. Decompression tank 1
Is on the outer periphery of the upper part of the bottomed cylindrical main body 1a having an open upper part,
An annular overflow receiving portion 1b is provided. The opening / closing lid 2 of the decompression tank 1 is openably / closably provided so as to close the upper part of the opening. This opening and closing is automated by electric or valve type. The decompression tank 1 can be evacuated to a vacuum by the decompression pump 3 with the opening / closing lid 2 closing the upper opening.

The cleaning liquid storage tank 10 contains the cleaning liquid, and when cleaning the work in the decompression tank 1,
The cleaning liquid in the cleaning liquid storage tank 10 is sent to the decompression tank 1 by the pump 11 via the solenoid valve 12, and is decompressed by the decompression pump 3 to make a vacuum. When the cleaning is completed at normal pressure, the cleaning liquid in the decompression tank 1 is decompressed. It returns to the cleaning liquid storage tank 10 from the bottom of 1 through the solenoid valves 13 and 14 and the cutting powder removing device 15. Reference numeral 16 is a densitometer for measuring the concentration of the cleaning liquid, 17 is a heater for keeping the cleaning liquid in the cleaning liquid storage tank 10 at a constant temperature, and 18 is a thermometer. 19a, 19b, 19c,
Reference numeral 19d is a partition plate, and the lower ends of the partition plates 19a and 19c are located above the bottom so that the partition plates 19a, 19b, 19c, 19
A passage is formed by d.

The oil-mixed cleaning liquid floating on the liquid surface in the recovery tank 10a of the cleaning liquid storage tank 10 (on the right side of the partition plate 19a) is sent by the pump 20 to the oil / water separator 22 through the filter 21 to separate the oil / water. The cleaning liquid from which the oil content has been removed is returned to the recovery tank of the cleaning liquid storage tank 10 (the portion on the left side of the partition plate 19d). As described above, the cleaning liquid in the cleaning liquid storage tank 10 is constantly circulated in the oil / water separator 22 to remove oil.

Reference numeral 23 is a pressure gauge, and 24 is a water level gauge. The oil-mixed cleaning liquid floated and separated during the cleaning of the work in the decompression tank 1 overflows and is returned from the overflow receiving portion 1b to the cleaning liquid storage tank 10 via the electromagnetic valves 30 and 14 and the cutting powder removing device 15. When the cleaning is completed, the cleaning liquid is stored in the cleaning liquid storage tank 10 from the bottom of the decompression tank 1 via the electromagnetic valves 13 and 14 and the cutting powder removing device 15.

The cleaning liquid attached to the work after cleaning is
The air is sucked from the outside by an injection device 73 described later, and the rinse liquid from the rinse liquid storage tank 70 is mixed with the air, and is sprayed into the decompression tank 1 through the solenoid valve 74 in a mist state to wash it away. Then, it is returned from the bottom of the decompression tank 1 into the cleaning liquid storage tank 10 via the solenoid valves 13 and 14 and the cutting powder removing device 15.

In the recovery tank 40, the rinse liquid in the decompression tank 1 after completion of rinsing, which will be described later, is transferred from the bottom of the decompression tank to the solenoid valve 1
The liquid in the malodor tank 40 is sent to the rinse regenerator 50 by the pump 41, and the rinse liquid is regenerated and stored in the rinse liquid storage tank. Sent to 60. The recovery tank 40 includes a water level gauge 42 and a rinse solution storage tank 70.
According to the water level balance of the water level gauge 63
3 is supplied through the filter 44.

The rinsing liquid storage tank 60 contains the rinsing liquid purified and regenerated by the rinsing liquid regenerator 50, and the rinsing liquid can be supplied into the decompression tank 1 by the pump 61 via the electromagnetic valve 62. And the injection device 70
To suck the air from the outside, mix the air with the rinse liquid from the rinse liquid storage tank 60, and
It can be atomized and sprayed into the decompression tank 1 via. Water can be reduced by making it mist. In addition, this injection device 70 can also inject only air.

Further, the rinse solution storage tank 60 is provided with a heater 64 and a thermometer 65, and the heater 64 is turned on and off based on the temperature detected by the thermometer 65.
The temperature in the rinse solution storage tank 60 is controlled and maintained at the set constant temperature.

A decompression drying tank 81 having an opening / closing lid 80 is provided beside the decompression tank 1, and the decompression pump 82 can decompress the decompression drying tank 81 to a vacuum. In the vacuum drying tank 81, the vacuum drying tank 8 is in a non-vacuum state.
A heating heater 83 for heating the air in the No. 1 is provided, and a fan 84 for agitating the air in the reduced pressure drying tank 81 is provided in order to apply this heat to the work. 85 is a fan motor. The work is transferred from the decompression tank 1 to the decompression drying tank 81 by the transfer device 90.

Next, the steps of cleaning, rinsing and drying the work will be described. When cleaning a work, for example, a precision metalwork product, first, the work W is transferred to the upper side of the decompression tank 1 by the transfer device 90, the opening / closing lid 2 of the decompression tank 1 is opened, and the work W is transferred by the transfer device 90 to the decompression tank 1. Then, the lid 2 is closed.

Next, the solenoid valve 12 is opened and the cleaning liquid in the cleaning liquid storage tank 10 is pumped into the decompression tank 1 into the main body 1a.
Infuse until the top of is reached. Next, the space above the cleaning liquid in the decompression tank 1 is decompressed by the decompression pump 3 to form a vacuum.
Therefore, the boiling point of the cleaning liquid in the decompression tank 1 is lowered, so that the cleaning liquid boils violently. The oil bubbles attached to the work W are stripped off by the small bubbles generated by the boiling, and floated and separated on the surface of the cleaning liquid.

After a predetermined time (for example, within 2 minutes), the decompression tank 1
Is returned to normal pressure by the decompression pump 3, and the amount of the cleaning liquid reduced by vaporization is injected from the cleaning liquid storage tank 10 by the pump 11 and decompressed again by the decompression pump 3 to boil the cleaning liquid. It is stripped off and surfaced. In this way, when decompressing → normal pressure is repeated multiple times,
The oil component floated and separated on the liquid surface of the main body 1a overflows, and the cleaning liquid storage tank 10 from the overflow receiving portion 1b via the electromagnetic valves 30 and 14 and the cutting powder removing device 15
Return to inside.

Finally, under normal pressure, the solenoid valves 13 and 14 are opened to remove the cleaning liquid in the decompression tank 1 with the cutting dust removing device 15 to the work W.
Cleaning fluid storage tank 1 by removing metal cutting powder that has peeled off from
Then, the electromagnetic valve 71 is opened and the injection device 70 mixes air with the rinsing liquid in the rinsing liquid storage tank 70 to atomize the rinsing liquid and spray it onto the work W to deposit the cleaning liquid on the work W. Wash away. The washed cleaning liquid is returned to the cleaning liquid storage tank 10 from the electromagnetic valves 13 and 14 through the cutting powder removing device 15. In this way, the cleaning process is completed.

The cleaning liquid storage tank 10 includes a recovery tank 10a.
And partitioning plates 19a and 19c vertically extending from above so as to form a communication port with the bottom and partitioning plates 19b and 19d planted upward from the bottom.
Are alternately provided, and serve as passages for the cleaning liquid to pass through.

Therefore, since the oil content in the cleaning liquid returned from the decompression tank 1 is light, it floats above the recovery tank 10a on the right side of the partition plate 19a, and the cleaning liquid containing less oil is formed by the partition plates 19a to 19d. The partition 19
It flows into the regeneration tank 10b on the left side of d.

The oil-mixed cleaning liquid in the upper layer portion of the recovery tank 10a is sent by the pump 20 to the oil-water separator 22 through the filter 21 to be separated into oil-water, and the cleaning liquid from which the oil has been removed is returned to the regeneration tank 10b. In this way, the recovery tank 10a
The cleaning liquid is constantly separated into oil and water by the oil-water separator 22 and sent to the regeneration tank 10b, and is circulated with the recovery tank 10a through the passage formed by the partition plates 19a to 19d to remove the oil content of the cleaning liquid.

The work W in which the cleaning process has been completed in the decompression tank 1 is next subjected to a rinsing process. That is, the electromagnetic valve 72 is opened and the rinse liquid in the rinse liquid storage tank 70 is injected into the decompression tank 1 by the pump 61 until it reaches the top of the main body 1a.

Next, the space above the rinse liquid in the decompression tank 1 is decompressed by the decompression pump 3 to form a vacuum. Therefore, the rinse liquid boils. The small bubbles generated by this boiling strip off the oil and the cleaning liquid attached to the work W. After a predetermined time (for example, within 2 minutes), the decompression tank 1 is returned to the normal pressure by the decompression pump 3, the rinse liquid is injected from the rinse liquid storage tank 60 by the pump 61, and the decompression pump 3 again decompresses the rinse liquid to boil. Let By repeating depressurization → normal pressure a plurality of times in this way, stains during rinsing can be reduced.

Finally, under normal pressure, the solenoid valves 13 and 31 are opened, the rinse liquid in the decompression tank 1 is removed by the cutting powder removing device 32 to remove the metal cutting powder peeled from the work W, and the rinse liquid is poured into the rinse collecting tank 40. Empty the decompression tank 1 with. Next, the electromagnetic valve 71 is opened, and the air sucked from the outside is jetted by the jetting device 70 to spray the rinse liquid adhering to the work W to reduce the water content.

The liquid in the recovery tank 40 is rinsed by the rinse liquid regenerator 50 and stored in the rinse liquid storage tank 60. Further, the rinse liquid supplied into the decompression tank 1 is turned on / off by the heater 64 so that the heater 64 and the thermometer 65 installed in the rinse liquid storage tank 60 detect the temperature and maintain a constant temperature.
F control is performed.

A water level meter 42 is provided in the recovery tank 40 and a water level meter 63 is provided in the rinse solution storage tank 60 to detect the water level which has lost water by evaporation, and to detect the city water according to the balance between the stored water level and the supply. Is supplied via the solenoid valve 43 and the filter 44. The water in the cleaning liquid storage tank 10 loses moisture due to evaporation. The lost water is detected by the water level gauge 24,
When it is detected that the value is equal to or less than a predetermined value, the liquid in the recovery tank 40 is automatically rinsed with the rinse liquid regeneration device 50 and the solenoid valve 5.
1 to the cleaning liquid storage tank 10.

When the above rinsing process is completed, the opening / closing lid 2
And the work W is lifted from inside the decompression tank 1 by the transfer device 90 and transferred to the side thereof, and the opening / closing lid 80 of the decompression drying tank 81 is opened and lowered into the decompression drying tank 81 to open / close the lid 80.
Close.

Next, the vacuum heater 81 is heated by the heater 83.
After heating the air inside and stirring the air with the fan 84 to give residual heat to the work W, the decompression pump 82 decompresses the drying tank 81.
Depressurize to vacuum. Since the boiling point of water is lowered by the depressurization, the water adhering to the work W is easily vaporized and the drying is accelerated. The residual heat is applied to the work W in order to prevent the work from freezing because the boiling point of the work W rises and vaporization of water adhering to the work W robs the heat of vaporization to freeze the work.

After a predetermined time, the reduced pressure drying tank 81 is returned to the normal pressure by the reduced pressure pump 82. The heating heater 83 again heats the air in the reduced pressure drying tank 81, and the fan 84 agitates the air to give residual heat to the work W, and then the reduced pressure pump 82 depressurizes the reduced pressure drying tank 81 to a vacuum, and then Return to normal pressure. This decompression →
The atmospheric pressure is repeated a plurality of times to dry the water attached to the work W. When the drying process is completed in this way, the opening / closing lid 80 is opened and the work W is lifted by the transfer device 90 and taken out.

[0030]

As described above, according to the present invention, the work and the cleaning liquid in the cleaning liquid storage tank are put into the decompression tank, the decompression tank is decompressed by the decompression pump, and the cleaning liquid is boiled to wash the work. The cleaning solution in the decompression tank is transferred to the cleaning solution storage tank, the rinse solution in the rinse solution storage tank is put in the decompression tank, and the decompression tank is decompressed by the decompression pump to boil the rinse solution. Since the work is rinsed by using the ultrasonic wave generator, the work is not damaged by the cavitation that occurs when the ultrasonic wave is oscillated, and the work has a joint structure or a bag hole structure. In the case of precision processed products, the boiling of the cleaning liquid and the rinse liquid occurs in the same way, so that the cleaning can be sufficiently performed even in such deep places.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Decompression tank 1b Overflow receiving part 2 Opening / closing lid 3 Decompression pump 10 Cleaning liquid storage tank 22 Oil-water separation device 40 Recovery tank 50 Rinsing liquid regenerating device 60 Rinsing liquid storage tank 70 Injection device 80 Opening / closing lid 81 Decompression drying tank 82 Decompression pump 90 Transfer device

Claims (2)

[Claims] 1. A decompression tank that can be decompressed by a decompression pump, a cleaning liquid storage tank having an oil / water separation function and an oil / water separation function, a recovery tank, and a rinse liquid storage tank equipped with a rinse regeneration device. The work and the cleaning liquid in the cleaning liquid storage tank are put in a tank, the work is cleaned by depressurizing the decompression tank by the decompression pump to boil the cleaning liquid, and then the cleaning liquid in the decompression tank is stored in the cleaning liquid. The rinse solution in the rinse solution storage tank is transferred to a tank, the rinse solution in the rinse solution storage tank is put in the tank, the pressure in the vacuum tank is reduced by the vacuum pump, and the rinse solution is boiled to rinse the work. Water-based cleaning device. 2. A work and a cleaning liquid are placed in a decompression tank, and the work is cleaned by depressurizing and boiling the cleaning liquid.
The oil-mixed cleaning liquid floating above the decompression tank overflows into the overflow receiving portion, and after the cleaning liquid is discharged from the decompression tank, a step of rinsing the cleaning liquid adhering to the work with the injection device, and the rinsing liquid in the decompression tank. A water-based cleaning method comprising the steps of rinsing a work by evacuating and rinsing the rinse liquid by boiling the rinse liquid, and then discharging the rinse liquid from the decompression tank and taking out the work.