JPH073481A - Equipment for cleaning greasy parts - Google Patents

Abstract

PURPOSE:To efficiently clean greasy parts by cleaning the greasy parts to be cleaned through transferring them to the cleaning tank, the sticking liquid removing tank, the water washing tank and the drying tank sequentially and also supplying the waste washing water from the water washing tank to the cleaning tank. CONSTITUTION:The greasy parts to be cleaned 10 are placed in the basket 21, transferred to the cleaning tank 1 with the trolley 22 and cleaned by dipping them in the cleaning liquid 30 which is heated up to about 20 to 100 deg.C with the heater 11 in the cleaning tank 1 and blowing a gas from the gas blowing pipe 12. After completion of the above cleaning, the resultant parts to be cleaned 10 are transferred to the sticking liquid removing tank 2 and the liquid sticking on the parts 10 is removed there by blowing a gas from the gas blowing pipe 13 and thereafter the parts 10 are transferred to the water washing tank 3. Then, the parts 10 are dipped in the washing water which is heated with the heater 14 in the water washing tank 3 and water-washed there by blowing a gas from the gas blowing pipe 15 and thereafter the water-washed parts 10 are transferred to the drying tank 4. At that time, the waste washing water from the water washing tank is reserved in the waste washing water tank 6 and supplied to the cleaning tank 1 through the oil separating vessel 5 at need. Also the water washing tank 3 is replenished properly with the fresh washing water through the water replenishing pipe 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cleaning oil deposits. More specifically, the present invention relates to an apparatus for cleaning and removing oil attached to an object to be cleaned such as metal parts.

[0002]

2. Description of the Related Art In the cutting process of machine parts, electric parts, etc., reduction of friction between a work material and a cutting tool, removal of frictional heat, washing of cutting wastes, extension of cutting tool life, machining surface Cutting oil, etc. is used for the purpose of smoothing. Therefore, since the cutting oil adheres to the parts that have undergone the cutting process, it is necessary to wash and remove the adhered oil when finishing the parts.

Conventionally, for cleaning and removing oil adhering to machine parts, hydrocarbon solvents such as kerosene, benzene and toluene, chlorinated hydrocarbon solvents such as trichloroethylene and tetrachloroethylene, trichlorotrifluoroethane and the like. Freon-based solvents are used. In particular, chlorinated hydrocarbon solvents and chlorofluorocarbon solvents are preferred because they have high cleaning ability and are nonflammable.

[0004]

However, hydrocarbon solvents are nonflammable and toxic. In particular, benzene, toluene, etc. are highly toxic and are used as harmful substances under the Industrial Safety Law, so handling them with extreme caution is required. Further, the use of chlorinated hydrocarbon solvents and freon solvents tends to be restricted due to problems such as toxicity and environmental pollution.

The present invention does not provide a method for cleaning oil deposits which is excellent in oil cleaning properties and does not cause any problems in terms of safety and environmental pollution, and a cleaning device suitable for carrying out this cleaning method. It is what

[0006]

According to another aspect of the present invention, there is provided a cleaning device for cleaning oil-adhered objects with a cleaning liquid, and an oil-adhered objects removed from the cleaning section. An attachment / detachment unit for desorbing the cleaning liquid, a water washing unit for rinsing the object to be washed from which the cleaning liquid has been desorbed to remove the adhering cleaning liquid, a circulation means for supplying the washing wastewater generated in the water washing unit to the cleaning unit, And a transfer means for sequentially transferring the object to be cleaned to the cleaning section, the adhering liquid desorbing section, and the water washing section.

According to a second aspect of the present invention, there is provided an apparatus for cleaning oil-deposited matter according to the first aspect, wherein the cleaning section includes a cleaning tank for containing a cleaning liquid and an object to be cleaned, and a gas supply pipe for blowing gas into the cleaning tank. It is characterized by having. A cleaning device for oily deposits according to a third aspect is the cleaning device according to the first or second aspect, in which the water-washing portion contains water for washing and a washing tank, and a gas supply pipe for blowing gas into the washing tank. It is characterized by having and.

A cleaning device for oily deposits according to a fourth aspect is characterized in that, in the cleaning device according to any one of the first to third aspects, the cleaning section is provided with a heating means for the cleaning liquid. According to a fifth aspect of the present invention, there is provided an apparatus for cleaning oil deposits according to any one of the first to fourth aspects, characterized in that the water washing section is provided with a heating means for washing water. According to the present invention, the object to be cleaned with the oil attached is first immersed in the cleaning tank containing the cleaning liquid in the cleaning step. Bubbles are raised from the bottom of the cleaning tank, and the oil adhering to the object to be cleaned is removed by the chemical cleaning action of the cleaning liquid and the physical action of the bubbles. Next, the object to be cleaned is taken out from the cleaning tank, and the cleaning liquid adhering to it in the water cleaning step is washed with water to be removed. At least a part of the washing wastewater generated in the washing process is supplied to the washing tank in the circulation process, so that at least a part of the water lost by evaporation from the washing liquid in the washing tank is replenished, and at the same time, the washing process generated in the washing process is performed. Reduce the wastewater treatment burden. Preferably, the entire amount of washing wastewater is supplied to the washing tank so that the burden of wastewater treatment is eliminated.

The cleaning liquid is usually used at room temperature or heated. It is preferable to heat to 20 to 100 ° C, especially 40 to 80 ° C. According to the present invention, the cleaning is performed by immersing the object to be cleaned having oil adhered in the cleaning liquid contained in the cleaning tank and raising bubbles in the cleaning liquid. Although the cleaning can be performed only by immersing the cleaning liquid in the cleaning liquid, the cleaning effect is remarkably improved when the physical action of the bubbles, that is, the stirring action of the cleaning liquid by the bubbles and the physical peeling action of the adhering oil are added. Further, the bubbles also have an effect of promptly transferring the oil separated from the object to be cleaned to the surface of the cleaning liquid (the cleaning liquid used in the present invention has a small dissolving power for oil itself,
The cleaning action depends exclusively on the removal of adhering oil from the object to be cleaned. Therefore, the peeled oil floats as oil droplets in the cleaning liquid). Furthermore, the bubbles promote the evaporation of water in the cleaning liquid, making it possible to receive the cleaning wastewater from the cleaning process as makeup water for adjusting the composition of the cleaning liquid.

Bubbles can be easily formed by blowing a gas such as air or nitrogen during cleaning. The amount of gas blown is usually about 0.2 to 20 Nl / min per liter of the cleaning liquid, but it may be appropriately adjusted according to the desired cleaning effect and the evaporation amount of water. The time required for washing is usually several minutes to tens of minutes. The cleaned object is taken out of the cleaning tank and washed with water to remove the cleaning liquid adhering thereto. Usually, in order to reduce the amount of waste water for washing, it is preferable that the washing liquid adhering to the object to be washed is first desorbed by physical means and then washed. The physical means for desorbing the cleaning liquid from the object to be cleaned includes, for example, gas in the object to be cleaned,
In the simplest case, it is preferable to blow air to blow off the attached cleaning liquid to remove it. The gas spraying speed and spraying time may be appropriately selected depending on the shape of the object to be cleaned and the allowable amount of remaining cleaning liquid adhered. Further, instead of spraying the gas, the cleaning liquid can be desorbed by applying a centrifugal force to the object to be cleaned. The cleaning liquid thus desorbed is collected and supplied to the cleaning tank.

Washing with water can be carried out by circulating and jetting water to the object to be cleaned by a pump, or can be carried out while blowing hot water vapor to condense, but normally, a water-washing tank containing water. A method of immersing the object to be cleaned in is adopted. Water is preferably used at room temperature or after being heated, preferably at 20 to 100 ° C, and particularly preferably at 40 to 80 ° C. The number of washing tanks is usually one, but a plurality of washing tanks may be arranged in series if desired. In this case, the washing water may be supplied to each washing tank, but it is preferable to move each washing tank countercurrently with the object to be washed according to a conventional method. It is preferable that air or other gas is blown into the water washing tank to raise bubbles in the tank. As a result, the inside of the tank is agitated, the removal of the cleaning liquid adhering to the object to be cleaned is promoted, and the evaporation of water in the tank is promoted, so that the water balance of the entire cleaning system is easily taken.

The article to be cleaned which has been washed with water is taken out from the washing tank to remove the attached water. Normally, air or a gas such as nitrogen is blown to blow off adhering water, and
dry. In the water washing step, it is necessary to constantly replenish new water and to withdraw part of it in order to prevent the accumulation of wash liquid components in the water. In the present invention, at least a part, preferably all of this water is supplied to the cleaning tank as make-up water.
That is, since water is lost from the cleaning tank by evaporation, water must be replenished from the outside in order to keep the composition of the cleaning liquid constant. In the present invention, as this makeup water,
Use the washing wastewater generated in the washing process. This makes it possible to prevent the loss of the effective components of the cleaning liquid and reduce or avoid the burden of wastewater treatment.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the apparatus for cleaning oily deposits of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a conceptual diagram showing an embodiment of the apparatus for cleaning oily deposits of the present invention.
In the figure, reference numeral 1 is a cleaning tank, in which a cleaning liquid 30 is stored, and an object to be cleaned 10 is immersed therein.
The cleaning tank 1 is provided with a heater 11 for heating the cleaning liquid and a gas blowing pipe 12 for blowing gas into the cleaning liquid.
The cleaning liquid 30 overflows and flows into the oil separation tank 5 via the pipe 31.

Reference numeral 2 is an adhering liquid desorption tank for blowing gas onto the object to be cleaned taken out from the cleaning tank to desorb the adhering cleaning liquid, and has a gas blowing pipe 13. The desorbed cleaning liquid flows into the oil separation tank 5 via the pipe 32. Reference numeral 3 is a washing tank, in which washing water 40 is stored. The washing tank 3 has a heater 1 for heating the washing water.
4, a gas injection pipe 15 and a water supply pipe 33 are provided. A part of the washing waste liquid generated in the washing tank 3 is withdrawn to the washing waste liquid tank 6 through the pipe 34. Depending on the required amount,
It is introduced into the oil separation tank 5 via the pipe 35. The oil floatingly separated in the oil separation tank 5 is discharged as waste oil from the discharge port 36 to the outside of the system. On the other hand, the cleaning liquid after separating the oil is supplied to the cleaning tank 1 through the pipe 39. In addition, a replenishing cleaning liquid and water (if necessary) are introduced into the oil separation tank 5 through pipes 37 and 38.

Reference numeral 4 denotes a drying tank for drying the object to be cleaned after washing with water, which has a hot air blowing pipe 16. 20
Is a transfer device for sequentially transferring the object to be cleaned to the cleaning tank 1, the attached liquid desorption tank 2, the water washing tank 3 and the drying tank 4. In the transfer device 20, transfer is performed to each step using a triloe 22 in which a net basket 21 containing the object to be cleaned 10 is suspended.

In such a cleaning apparatus of the present invention, as the cleaning liquid, the dissolving power of the cleaning liquid for oil itself is small, and the cleaning action is excellent in the ability to remove the adhered oil from the object to be cleaned. , N-methyl-2-
It is preferable to use a mixture of pyrrolidone (hereinafter referred to as “NMP”) with water. In this case, the weight ratio of NMP to the total of NMP and water is usually at least 50%.
This is because if this ratio exceeds 50%, the detergency of oil is significantly reduced. Normally, the NMP ratio is 60 from the viewpoint of detergency.
% Or more. From the viewpoint of detergency, there is no upper limit for the NMP ratio. However, if the ratio of NMP becomes too high, the cleaning liquid becomes flammable and becomes a dangerous substance under the Fire Service Law, and its handling is restricted. Therefore, in order to keep the NMP ratio within the range that is not flammable, water is usually 10%.
As described above, preferably 15% or more is allowed to coexist. Further, when water is present in the cleaning liquid, there is an advantage that the generation of peroxide due to contact with air is suppressed and the oil taken into the cleaning liquid is difficult to be emulsified. Taking these points together, the preferable ratio of NMP is 60 to 90%,
In particular, it is 70 to 85%.

When a small amount of an alkaline compound is added, the oil cleaning effect is further improved. 1 for alkaline compounds
It is preferably blended at a concentration of at least 00 ppm, particularly 300 to 5000 ppm. As an alkaline compound,
In addition to alkali metal or alkaline earth metal hydroxides, carbonates, acetates and the like, organic amines can be mentioned. Alkali metal or alkaline earth metal hydroxides such as sodium hydroxide, potassium hydroxide and calcium hydroxide are preferred.
Further, the cleaning solution may contain a commonly used antioxidant or rust preventive.

In the present invention, the objects to be cleaned to which the oil content is attached include electronic parts, electric parts, precision machine parts, resin processed parts, precision parts such as optical parts, machine parts, automobile parts and Examples include jigs and tools used in the assembly process. Specifically, examples of electronic components include printed wiring boards, IC lead frames, capacitors, liquid crystal displays, and semiconductor materials. As electrical equipment parts, parts such as cores for coaters, magnets,
Examples thereof include electric motor parts such as brushes and housings. Examples of precision machine parts include bearings, sewing machine parts, and processing parts. Examples of the optical component include a lens. The mechanical parts include bearings, gears, various mechanical parts, and the like. Examples of automobile parts include engine parts, transmission gears, and carburetors. Further, examples of jigs and tools used in such an assembly process of parts include jigs and tools handled in various processes such as manufacturing, molding, processing, assembling, and finishing of the precision parts. .

Examples of the oil component attached to these objects to be cleaned include machine oil, cutting oil, fats and oils, grease and the like.

[0020]

EFFECTS OF THE INVENTION According to the present invention, it is possible to efficiently wash oil deposits and reduce or avoid the burden of wastewater treatment.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an embodiment of a device for cleaning oily deposits of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washing tank 2 Adhesive liquid desorption tank 3 Washing tank 4 Drying tank 5 Oil separation tank 6 Washing waste liquid tank 10 Washed object 11 Heater 12 Gas blowing pipe 13 Gas blowing pipe 14 Heater 15 Gas blowing pipe 16 Gas blowing pipe 20 Transfer device 21 net basket 22 trolley 30 cleaning liquid 31 pipe 32 pipe 33 water supply pipe 34 pipe 35 pipe 36 discharge port 37 pipe 38 pipe 39 pipe 40 washing water

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Asanuma 3-10, Shiodotsu, Kurashiki-shi, Okayama Mitsubishi Kasei Co., Ltd. Mizushima Plant

Claims (5)

[Claims] 1. A cleaning unit for cleaning an object to be cleaned with oil with a cleaning liquid, an attachment / detachment unit for removing the cleaning liquid adhering from the object to be cleaned taken out from the cleaning unit, and a cleaning liquid A washing section for washing the article to be washed with water to remove the adhering washing liquid, a circulation means for supplying the washing wastewater generated in the washing section to the washing section, and a washing section for the article to be washed, an adhering liquid desorption section and a water washing section An apparatus for cleaning oil deposits, comprising: a transfer means for sequentially transferring the oil to the oil. 2. The oil deposit according to claim 1, wherein the cleaning unit includes a cleaning tank containing a cleaning liquid and an object to be cleaned, and a gas supply pipe for blowing gas into the cleaning tank. Cleaning device. 3. The rinsing section comprises a rinsing tank for containing water for rinsing and an object to be cleaned, and a gas supply pipe for blowing gas into the rinsing tank. Equipment for cleaning oil deposits. 4. The cleaning apparatus for oily deposits according to claim 1, wherein the cleaning section includes a heating means for the cleaning liquid. 5. The apparatus for cleaning oil deposits according to claim 1, wherein the water washing section is provided with a heating means for washing water.