JP2665245B2 - Paint temperature adjustment method - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for adjusting the temperature of a paint supplied from a paint tank to a coating booth to a set temperature.

(Prior Art) When a coating operation is performed automatically by using a coating robot or the like in a coating booth, the coating viscosity must be constant in order to make the discharge amount constant so that the film thickness of the object to be coated becomes uniform. Here, the causes of the viscosity change are mainly the paint composition and the coating temperature, but once the paint composition is prepared, there is almost no change, but the paint temperature easily changes depending on the air temperature. Therefore, it is necessary to keep the paint temperature at the time of application at a predetermined temperature.

Therefore, as a conventional method of controlling the paint temperature, a method is known in which a plurality of paint tanks are performed by a paint temperature control device having a double tank structure capable of circulating a fluid for controlling the paint temperature around the outside thereof ( For example, JP-A-60-48
167 publication).

(Problems to be Solved by the Invention) In the conventional method of controlling the temperature of the paint, the paint tank is obliged to be sufficiently separated from the paint booth by the Fire Service Law. There was a problem that the pipe was cooled or heated by the air temperature in the middle of the pipe to the painting booth which is usually several hundred meters. Further, there is a problem in that the energy of hot water or cold water is wasted in order to always adjust the paint temperature to the set value even for the paint that has not been coated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a paint capable of adjusting a paint temperature at the time of application to a set temperature and achieving energy saving. It is intended to provide a temperature control method.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a paint color of an object to be coated detected by an identification device provided in front of a coating booth and a temperature detected by a temperature sensor provided in each of the paint tanks. A heat exchanger provided near each of the coating booths and for each paint is operated based on the paint temperature to heat or cool each paint.

(Operation) The paint temperature at the time of application of the paint is set by operating the heat exchanger based on the paint color of the object to be coated detected by the identification device and each paint temperature detected by the temperature sensor. Is adjusted to

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an explanatory view showing an apparatus for carrying out the coating material temperature adjusting method of the present invention.

An apparatus for carrying out the present invention includes paint tanks 1, 2, and 3 for storing paints of respective colors to correspond to paint colors, and paints of these paint tanks 1, 2, and 3 provided in a paint booth 4, respectively. Pumps 8, 9, and 10 for supplying coating guns 5, 6, and 7 and heat provided near the coating booth 4 for heating or cooling the paint discharged from these pumps 8, 9, and 10, respectively. Exchanger 11,1
2, 13 and a controller 14 for outputting signals for operating these heat exchangers 11, 12, 13; a discriminating device 15 for detecting the paint color of the workpiece W which is an input signal of the controller 14; and a paint tank. Temperature sensors for detecting paint temperature of 1, 2, 3
It is composed of 17,18.

If the paint temperature is lower than the set temperature, hot water is used as the heat source (not shown) of the heat exchangers 11, 12 and 13, and if the paint temperature is higher than the set temperature, cold water is used. Are supplied to the heat source circuits 22, 23, 24 via the.

In addition, the paint pipes run from paint tanks 1,2,3 to pumps 8,9,1.
0, the main lines 25, 26, 27 returning to the paint tank again via the heat exchangers 11, 12, 13 and the painting booth 4, and the heat exchangers 11, 12, 13
Feed lines 31, 32, 33 connecting the main lines 25, 26, 27 on the outlet side of the tank with the regulators 28, 29, 30 of the coating guns 5, 6, 7 and return the paint to the paint tanks 1, 2, 3 And return lines 37, 38, 39 connecting the sub-lines 34, 35, 36, the regulators 28, 29, 30 and the sub-lines 34, 35, 36.

Also, a mixing room is constructed by providing a filter 42 having pressure gauges 40 and 41 in front and behind for each pipe of each paint color, and this mixing room is separated from the painting booth 4 by a sufficient distance defined by the Fire Service Law (normally). (Several hundred meters) apart.

Further, a back pressure regulator 43 for keeping the discharge pressure of the paint constant is provided in each of the pipelines on the return side to the paint tanks 1, 2, and 3.

The operation of the method for controlling a paint temperature performed by the apparatus configured as described above will be described below.

Since the paint contains pigments, resins, organic solvents, etc., the components settle and separate in the stagnant state, so the pumps 8, 9, and 10 are driven to constantly paint the paint tanks 1, 2, and 3. The main lines 25, 26, 27, the regulators 28, 29, 30 and the sub lines 34, 35, 36, and the paint tanks 1, 2, 3 are circulated.

The work W is conveyed by a conveyor or the like in the direction of the arrow in the figure. Then, the identification device 15 detects the coating color of the workpiece W before it is carried into the coating booth 4, and inputs the coating color signal to the controller 14. On the other hand, temperature sensors 16, 17, and 18 provided in the paint tanks 1, 2, and 3 always detect the paint temperature and input it to the controller.

Therefore, if the paint color is the paint in the paint tank 1 based on the paint color signal and the paint temperature, and the paint temperature is different from the set temperature, the controller 14 determines the heat exchanger 11 of the paint color.
Open the stop valve 19. Therefore, the heat source circuit 22
The hot or cold water flows, and the paint is constantly flowing through the main line 25 to the heat exchanger 11, so that the paint temperature is gradually increased or decreased to be adjusted to the set temperature. When the paint temperature reaches the set temperature, the controller 14 closes the stop valve 19 of the heat source circuit 22 to stop heating or cooling.

During this time, the stop valves 20, 21 of the heat exchangers 12, 13 of other coating colors are in a closed state. However, if the paint temperature exceeds the capacity of the heat exchangers 12 and 13, the controller 14 operates the heat exchangers 12 and 13 in advance so that the paint temperature at the time of application can be raised or lowered to the set temperature. deep.

(Effects of the Invention) As described above, according to the present invention, since a heat exchanger is provided near each coating booth and for each coating material, heat energy can be reduced by cooling or heating the coating material between the heat exchanger and the coating booth. Low loss.

Further, since only the paint used in the painting booth is heated or cooled by detecting the paint color of the object to be painted by the identification device, the operation of the heat exchanger can be automated and energy can be saved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an apparatus for carrying out the coating material temperature adjusting method of the present invention. In the drawings, 1, 2, and 3 are fuel tanks, 4 is a painting booth, 11,
12, 13 are heat exchangers, 15 is an identification device, 16, 17, and 18 are temperature sensors, and W is an object to be coated.

Claims (1)

(57) [Claims] A paint temperature adjusting method for adjusting a paint temperature at the time of application to a set temperature when applying paint by supplying paint from a plurality of paint tanks to a paint booth.
Provided in the vicinity of the coating booth and for each coating based on the coating color of the object to be coated detected by the identification device provided in front of the coating booth and each coating temperature detected by a temperature sensor provided in each of the coating tanks. A method for controlling the temperature of a paint, wherein the paint is heated or cooled by operating a heat exchanger.