JP3242316B2 - Cleaning method inside paint tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning the inside of a fixed or movable closed paint tank.

[0002]

2. Description of the Related Art A closed type paint tank of this kind is used by a worker using a cleaning solvent with a brush to clean the inner wall surface after the paint is discharged or before the paint of another kind or the same kind is differently filled. It takes considerable man-hours and time to wash paint that has adhered to the human body.
The negative impact on the environment is a problem.

[0003]

Therefore, the present inventor has proposed:
In the process of discharging the paint from the tank, the device was designed to automatically wash off the paint from the wall in the space formed above the tank at the same time. That is, the present invention significantly improves workability by accomplishing the cleaning of the paint on the tank inner wall by using the paint discharge time without requiring any manpower.
It is an object of the present invention to provide a method for cleaning the inside of a paint tank that avoids contamination of the human body and the environment due to the use of a solvent.

[0004]

Therefore, in the present invention,
Inside the cleaning treatment of <br/> paint tank that issues discharge the paint filled in the tank from the bottom of the tank, the paint in the tank
A heating means for heating the lower part of the tank,
To accelerate the evaporation of the solvent from the paint on the inner, comprises a cooling means for cooling the inner wall of the tank to the middle or upper part of the tank, to condense solvent evaporated from the paint tank inner wall, the condensation
Paint that adheres to the tank inner wall with solvent flowing down the tank inner wall.
Dissolve the paint, wash the paint on the tank inner wall and discharge the paint.
It is characterized by being performed simultaneously .

[0005] In this case, the cooling means is means for passing cooling water and other refrigerants provided on the outer periphery of the tank. The heating means may be a steam heating means or an explosion-proof electric heating means provided on the peripheral wall of the tank at least at the lower part of the tank. Furthermore, the heating control of the above-mentioned heating means is performed by setting the temperature of the paint to 50 ° C.
Desirably, the temperature is set to 0 ° C.

The above-mentioned tank is of a closed type and, if necessary, is provided with a stirring means for stirring the internal paint.
Supersaturation of the solvent introduced and evaporation of the external air accompanied by weight loss in the tank coating is provided with a hole to leak. It is effective that the stirring means is a high-speed stirring disperser which raises the temperature of the internal coating material by stirring as the heating means.

[0007] The cooling means is preferably controlled after the tank is filled with a solvent. When the paint tank is of a movable type, as long as the top surface of the tank is open and a lid can be formed, it is needless to say that a sufficient cleaning effect can be obtained even if it is not a completely closed type.

[0008] Thereby, simultaneously with the discharge of the paint,
Cleaning of the paint on the inner wall of the tank is achieved, leaving only a slight finish cleaning, greatly improving workability, and reducing the adverse effects on the human body and the environment due to evaporation of the solvent into the atmosphere. Avoidable, safe and sanitary.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a method for cleaning the inside of a paint tank according to the present invention will be specifically described. Here, the paint tank 1 is a fixed type, and a coil-shaped conduit 2 for cooling water circulation or refrigerant circulation is provided on the outer peripheral wall of the tank at the upper and middle parts of the tank. Cooling water or gas refrigerant is sent from a required control mechanism (not shown) to cool the tank wall. Further, the paint tank 1 is provided with a discharge port 3 with an open / close valve on the bottom side wall. In this embodiment, the paint tank 1 is provided with a heating means 4 for heating the paint in the tank at least at a lower portion thereof. Then, the heating means 4 is heated and controlled by an appropriate temperature control means (not shown) so that the heating means 4 heats the paint in the tank to a temperature at which the solvent evaporates in the tank. It has become.

In this case, the tank 1 is of a closed type, and is provided with stirring means 5 such as a variable type disperser (agitator) for stirring the internal coating material. The high-speed rotation aims at increasing the liquid temperature, and the stirring at a low speed. is working to homogenize the paint, also, supersaturation of the solvent introduced and evaporation of the external air accompanied by weight loss in the tank coating is provided with a hole 6 to be leaking. In addition, as a general method, means for preventing the leaked supersaturated solvent from being diffused into the atmosphere, for example, means for condensing the solvent by active cooling are naturally applied to the outside of the through hole 6.

The heating means 4 is, specifically, a steam heating means or an explosion-proof electric heating means provided on the tank peripheral wall at least at the lower part of the tank 1. In the former case, a steam passage is formed in the lower peripheral wall of the tank, and steam whose temperature has been adjusted is supplied thereto to heat the paint in the tank. In the latter case, more specifically, an explosion-proof nichrome wire heater is wound around the lower peripheral wall of the tank.

Further, if necessary, the heating control of the heating means 4 may be performed so that the temperature of the paint in the tank 1 is set to 50 ° C. to 80 ° C., although it depends on the components of the solvent contained in the paint. desirable. For this purpose, means for detecting the temperature of the paint in the tank 1 and control means for controlling the steam supply amount or the current supply amount based on the detection result are required.

According to the cleaning treatment method of the present invention, the paint, which has been adjusted to a suitable viscosity with a solvent as required, is filled into the paint tank 1, and then the paint is stirred by the stirring means 5, and then the inside of the tank is stirred. When the paint is discharged from the tank, the paint is heated at least at the lower part of the tank, and the solvent evaporated from the paint is condensed on the inner wall surface of the tank at the upper and middle parts of the tank by the cooling means 2 to remove the paint adhered to the wall surface. Melt it down. The coating may be heated by stirring with a high-speed disper and, when the temperature rise is insufficient, by a heating device installed at the lower part of the tank.

Thus, simultaneously with the discharge of the paint,
Cleaning of the paint on the inner wall of the tank is achieved, leaving only a slight finish cleaning, greatly improving workability, and reducing the adverse effects on the human body and the environment due to evaporation of the solvent into the atmosphere. Can be avoided.

[0015] If necessary, as a final cleaning,
The same type of solvent is introduced into the tank 1 to dissolve the paint remaining on the inner wall, bottom floor, etc. of the tank 1 by the action of evaporation, condensation, or by simple contact.
It is natural to discharge. Also, for this, for example,
The solvent may be filled through the through hole 6 and the outlet 3. In order to fill such a closed type tank 1 with paint, the above-mentioned discharge port 3 can be used as a filling port. In this case, the through hole 6 can function as a discharge port for the internal air of the tank 1.

Further, in the embodiment of the present invention, the use of cooling water or a cooling medium is exemplified as the cooling means, but other means such as air cooling may be employed. Although the heating means is used for heating the paint in the tank, a low-speed stirring disper as a stirring means for increasing the temperature of the internal paint by stirring may be used as the heating means.

[0017]

According to the present invention, as described above in detail, in the interior cleaning treatment of the paint tank that issues discharge the paint filled in the tank from the bottom of the tank, heating the coating material in the tank
A heating means is provided at the bottom of the tank to
Evaporation of the solvent promotes from fees, comprises a cooling means for cooling the inner wall of the tank to the middle or upper part of the tank, the solvent evaporated from the coating by condensation in the tank inner wall, and the condensation Tan
Dissolve paint that has adhered to the tank inner wall with the solvent flowing down the inner wall of the tank.
Thus, the cleaning of the paint on the inner wall of the tank proceeds simultaneously with the discharge of paint.
It is characterized in that it is performed in rows .

As a result, only a slight finishing cleaning is left, so that the workability can be greatly improved, and the adverse effect on the human body and the environment due to evaporation of the solvent into the atmosphere can be avoided.
Safe and sanitary.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional side view showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 2 Cooling means 3 Outlet 4 Heating means 5 Stirring means 6 Through hole

Continuation of front page (56) References JP-A-59-115290 (JP, A) JP-A-53-124313 (JP, A) JP-A-62-230889 (JP, A) JP-A-7-256197 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 88/00-90/66 B05C 11/10

Claims (6)

(57) [Claims] 1. A internal cleaning treatment of the paint tank that issues discharge the paint filled in the tank from the bottom <br/> of the tank,
A heating means for heating the paint in the tank is provided at the bottom of the tank.
And Bei, to accelerate the evaporation of the solvent from the paint in the tank, middle or top of the tank a cooling means for cooling the inner wall of the tank
And provided to the condensation of the solvent evaporated from the paint tank inner wall
And the solvent condenses and flows down the inner wall of the tank.
Dissolve the paint on the wall and wash the paint on the tank inner wall
Cleaning the inside of the paint tank simultaneously with the discharge of the paint . Wherein said cooling means, the internal cleaning treatment of the paint tank according to claim 1, characterized in that the means for passing cooling water or other refrigerant disposed in the tank periphery. 3. The heating means includes a steam heating means provided on a tank peripheral wall at least at a lower portion of the tank.
Alternatively, the internal cleaning treatment of the paint tank according to claim 1, characterized in that the explosion-proof electric device. 4. A heating control of the heating means, inside cleaning processing of the paint tank according to claim 1, characterized in that it is carried out coating temperature to the 50 ° C. to 80 ° C.
Law . Wherein said tank is sealed, as well as provided with a stirring means for stirring the interior paint, supersaturation of the solvent introduced and evaporation of the external air accompanied by weight loss of the paint in the tank a hole to leak The method for cleaning the inside of a paint tank according to claim 1, wherein the method is provided . 6. The stirring means as the heating means,
If raising the temperature of the internal coating by agitation is fast agitation disperser, also internal cleaning treatment of the paint tank according to claim 5 in the case of filling, characterized by using a disper for varying the low speed .