JPH09168758A - Viscosity control device for paint in tank in automatic painting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately control the viscosity of a paint in an automatic painting apparatus by controlling the temp. of paint. SOLUTION: In an automatic painting apparatus spraying the paint 2 in a tank 3 by a spray gun 4, a heating device 8 heating the tank 3 and a viscosity measuring device 21 measuring the viscosity of the paint in the tank 3 are provided and the heating device 8 is constituted of a jacket 12 covering the outer peripheral part of the tank 3 and filled with warm water 11, a circulating pipeline 13 again supplying the warm water 11 discharged from the jacket 12 to the jacket 12 and the heater 15 heating the warm water 11 flowing through the circulating pipeline 13. A control unit 22 controlling the heater 15 on the basis of the value measured by the viscosity measuring device 21 to be fed back is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adjusting device for adjusting the viscosity of paint in a tank in an automatic painting device.

[0002]

2. Description of the Related Art Conventionally, an automatic coating apparatus, as shown in FIG. 4, has a tank 46 containing a paint 45 and a paint in the tank 46.
A spray gun 47 for spraying 45, a main line 48 connecting the tank 46 and the spray gun 47, and a paint 45 in the tank 46.
It is composed of a pump 49 that sucks in and discharges it to the spray gun 47. A switching valve 50 for switching the flow direction is provided in the middle of the main pipeline 48, and a circulation pipeline 51 is provided between the switching valve 50 and the tank 46. A heater 52 for heating the paint 45 flowing in the circulation pipeline 51 is provided in the middle of the circulation pipeline 51.

According to this, the viscosity of the coating material largely depends on the quality of the coating material, and in the case of undiluted coating, the viscosity of the coating material depends on the temperature, so it was considered to control the coating material temperature. That is, the paint sent from the tank 46
45 flows into the circulation conduit 51 in the middle of the main conduit 48, is warmed by the heater 52, and is temperature-controlled to return to the inside of the tank 46.

[0004]

However, in the above conventional type, the paint 45 in the tank 46 is greatly affected by the outside air temperature. Therefore, when the outside air temperature is low, the paint 45 flows from the circulation line 51 to the tank. There was a problem that the paint 45 cooled and increased in viscosity when it returned to the inside of 46. Further, there is a problem that temperature control cannot be performed unless the paint 45 passes through the circulation pipe line 51.

Therefore, the first aspect of the present invention is to accurately control the viscosity of the paint in the tank.

[0006]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention warms the tank in an automatic coating device for spraying the paint in the tank with a spray gun. A heating device, a viscosity measuring device for measuring the viscosity of the paint in the tank, and a control device for controlling the heating device based on the value measured by the viscosity measuring device and fed back, It was done.

According to this, when the measured value of the viscosity of the paint in the tank measured by the viscosity measuring device is different from the predetermined value, the controller controls the heating device based on the fed back measured value. The temperature of the paint in it is kept at a predetermined temperature, so that the viscosity of the paint in the tank is accurately and quickly adjusted to a predetermined value.

Further, according to the invention of claim 2, in the heating device, the jacket which covers the outer peripheral portion of the tank and is filled with the heating fluid inside, and the heating fluid discharged from the jacket are again introduced into the jacket. It is composed of a circulation line for supply and a heater for heating a heating fluid flowing in the circulation line, and the heater is characterized by being controlled by a controller.

Further, according to the invention of claim 3, the heating device comprises a heating pipe wound around the outer peripheral portion of the tank to form a closed pipe path, and a heater for heating the heating fluid flowing in the heating pipe. It is characterized in that this heater is controlled by a control device.

Further, the invention according to claim 4 uses a sheet-shaped heating element for covering the outer peripheral portion of the tank as a heating device,
The heating device is characterized by being controlled by a control device.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIG. Automatic coating device 1 is paint 2
A tank 3 containing the water, a spray gun 4 for spraying the paint 2 in the tank 3, a main pipe 6 connecting the outlet 5 of the tank 3 and the spray gun 4, and a main pipe 6 provided in the middle of the main pipe 6. To suck paint 2 in tank 3 and spray gun 4
It is composed of a main pump 7 that discharges into the tank, and a heating device 8 that warms the tank 3.

The heating device 8 covers the outer peripheral portion of the tank 3 and has a jacket 12 filled with warm water 11 (an example of a heating fluid) inside, and the warm water 11 discharged from the jacket 12 is again jacketed to the jacket 12. It is composed of a circulation pipe 13 for supplying the inside, a circulation pump 14 for forcibly circulating the hot water 11 in the circulation pipe 13, and a heater 15 for heating the hot water 11 flowing in the circulation pipe 13. There is.

The tank 3 is provided with a stirrer 17 for stirring the paint 2 in the tank 3. This stirrer 17
It comprises a rotary shaft 18 inserted into the tank 3 from above, a propeller-shaped stirring blade 19 provided at the lower end of the rotary shaft 18, and a motor 20 for rotating the rotary shaft 18. Reference numeral 21 is a viscosity measuring device that measures the viscosity of the coating material 2 in the tank 3 based on the resistance value that the stirring blade 19 receives during stirring.

Further, 22 is the heater 15 based on the value measured and fed back by the viscosity measuring device 21.
The control device 22 and the viscosity measuring instrument 21 are connected by a feedback signal line 23.

The operation of the above configuration will be described below.
For example, when the temperature of the paint 2 in the tank 3 is lower than a predetermined temperature, the viscosity of the paint 2 in the tank 3 increases and the resistance value that the stirring blade 19 receives during stirring increases. The measured value measured is higher than the predetermined value. Then, the control device 22 controls the feedback signal line.
The heating amount of the heater 15 is increased based on the measurement value fed back from the viscosity measuring device 21 via 23. As a result, the temperature of the hot water 11 flowing in the circulation pipeline 13 rises, so that the tank 3 is warmed by the hot water 11 inside the jacket 12, and the temperature of the paint 2 in the tank 3 rises and is kept at a predetermined temperature. Therefore, the viscosity of the coating material 2 in the tank 3 is reduced, and the viscosity is accurately adjusted to a predetermined value.

Further, when the temperature of the paint 2 in the tank 3 rises above a predetermined temperature, the viscosity of the paint 2 in the tank 3 becomes low and the resistance value that the stirring blade 19 receives at the time of stirring decreases. The measurement value measured by the device 21 is lower than the predetermined value. Then, the control device 22 lowers the heating amount of the heater 15 (or suspends the operation of the heater 15) based on the measurement value fed back from the viscosity measuring device 21 via the feedback signal line 23. As a result, the temperature of the hot water 11 flowing in the circulation pipe 13 is lowered, so that the temperature of the paint 3 in the tank 3 and the temperature of the paint 2 in the tank 3 are both lowered and maintained at a predetermined temperature. Rises and is accurately adjusted to a predetermined value.

As described above, the heater 15 is controlled on the basis of the feedback from the viscosity measuring instrument 21 and the tank 3 is directly controlled.
Since it can be warmed, the viscosity of the paint 2 in the tank 3 can be adjusted accurately and quickly.

Next, a second embodiment of the present invention will be described with reference to FIG. The heating device 29 includes a heating pipe 30 wound around the outer periphery of the tank 3 to form a closed pipe, and a circulation of forcibly circulating hot water 31 (an example of a heating fluid) filled in the heating pipe 30. It is composed of a pump 32 and a heater 33 for heating the warm water 31 flowing in the heating pipe 30.

According to this, for example, when the temperature of the paint 2 in the tank 3 becomes lower than a predetermined temperature, the viscosity of the paint 2 in the tank 3 becomes high and the resistance value of the stirring blade 19 at the time of stirring increases. Therefore, the measurement value measured by the viscosity measuring device 21 becomes a value higher than the predetermined value. Then, the control device 22
The heating amount of the heater 33 is increased based on the measurement value fed back from the viscosity measuring device 21 via the feedback signal line 23. As a result, the warm water flowing in the heating pipe 30
Since the temperature of 31 rises, the tank 3 is warmed by the hot water 31 and the temperature of the paint 2 in the tank 3 rises and is kept at a predetermined temperature. Therefore, the viscosity of the paint 2 in the tank 3 decreases and falls to a predetermined value. Adjusted accurately.

Further, when the temperature of the paint 2 in the tank 3 rises above a predetermined temperature, the viscosity of the paint 2 in the tank 3 becomes low and the resistance value that the stirring blade 19 receives at the time of stirring decreases. The measurement value measured by the device 21 is lower than the predetermined value. Then, the control device 22 lowers the heating amount of the heater 33 (or suspends the operation of the heater 33) based on the measurement value fed back from the viscosity measuring device 21 via the feedback signal line 23. As a result, the temperature of the hot water 31 flowing in the heating pipe 30 is lowered, so that the temperatures of the paint 3 in the tank 3 and the inside thereof are both lowered and maintained at a predetermined temperature. Therefore, the viscosity of the paint 2 in the tank 3 is reduced. It rises and is precisely adjusted to a predetermined value.

In this way, the heater 33 is controlled based on the feedback from the viscosity measuring instrument 21 to directly feed the tank 3
Since it can be warmed, the viscosity of the paint 2 in the tank 3 can be adjusted accurately and quickly.

Further, since the heating pipe 30 is wound around the outer peripheral portion of the tank 3 in the second embodiment described here,
As compared with the case where the outer peripheral portion of the tank 3 is covered with the jacket 12 as in the first embodiment described above, the manufacturing can be performed easily.

Although hot water 11 and 31 are used as an example of the heating fluid in the first and second embodiments, liquids other than water or gases such as steam may be used. Next, a third embodiment of the present invention will be described based on FIG.

As the heating device 38, a flexible sheet-shaped electrothermal heater 39 (an example of a heating element) that covers the outer peripheral portion of the tank 3 is used, and the electrothermal heater 39 is controlled by the control device 22.

According to this, for example, when the temperature of the paint 2 in the tank 3 becomes lower than a predetermined temperature, the viscosity of the paint 2 in the tank 3 becomes high and the resistance value of the stirring blade 19 at the time of stirring increases. Therefore, the measurement value measured by the viscosity measuring device 21 becomes a value higher than the predetermined value. Then, the control device 22
The heating amount of the electrothermal heater 39 is increased based on the measurement value fed back from the viscosity measuring device 21 via the feedback signal line 23. As a result, the tank 3 is warmed by the heat of the electric heater 39, and the temperature of the paint 2 in the tank 3 rises and is maintained at a predetermined temperature. Therefore, the viscosity of the paint 2 in the tank 3 decreases and the predetermined value is reached. Adjusted accurately.

Further, when the temperature of the paint 2 in the tank 3 rises above a predetermined temperature, the viscosity of the paint 2 in the tank 3 becomes low and the resistance value that the stirring blade 19 receives at the time of stirring decreases. The measurement value measured by the device 21 is lower than the predetermined value. Then, the control device 22 lowers the heating amount of the electrothermal heater 39 based on the measurement value fed back from the viscosity measuring device 21 via the feedback signal line 23 (or suspends the operation of the electrothermal heater 39). . As a result, the temperatures of the tank 3 and the paint 2 in the tank 3 are both lowered and maintained at a predetermined temperature, and therefore, the viscosity of the paint 2 in the tank 3 is raised and accurately adjusted to a predetermined value.

As described above, since the electric heater 39 can be controlled to directly heat the tank 3 based on the feedback from the viscosity measuring device 21, the paint 2 in the tank 3 can be heated.
The viscosity of can be adjusted accurately and quickly.

In each of the above embodiments, the stirring blade 19 is used during stirring.
Although the viscosity measuring device 21 for measuring the viscosity of the paint 2 in the tank 3 is provided based on the resistance value received by the, the viscosity may be measured using a rotational viscometer or a vibration viscometer.

[0029]

As described above, according to the invention of claim 1 of the present invention, when the measured value of the viscosity of the paint in the tank measured by the viscosity measuring device is different from the predetermined value,
Since the control device controls the heating device based on the fed back measurement value, the temperature of the paint in the tank is maintained at a predetermined temperature, and therefore the viscosity of the paint in the tank is accurately and quickly adjusted to the predetermined value. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a paint viscosity adjusting device in a tank of an automatic coating device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a paint viscosity adjusting device in a tank of an automatic coating device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a paint viscosity adjusting device in a tank of an automatic coating device according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a paint viscosity adjusting device in a tank of a conventional automatic coating device.

[Explanation of symbols]

 1 Automatic coating device 2 Paint 3 Tank 4 Spray gun 8 Heating device 11 Hot water (heating fluid) 12 Jacket 13 Circulating pipeline 15 Heater 21 Viscometer 22 Control device 29 Heating device 30 Heating pipe 31 Hot water (heating fluid) 33 Heater 38 Heating device 39 Electric heater (heating element)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Otsuka 5-3-3, Nishikujo 5-chome, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd.

Claims (4)

[Claims] 1. An automatic coating device for spraying paint in a tank with a spray gun, a heating device for warming the tank, a viscosity measuring device for measuring the viscosity of the paint in the tank, and a viscosity measuring device for measuring the viscosity of the paint. A controller for controlling the heating device on the basis of the value fed back as a feedback control value, and a device for adjusting the viscosity of paint in a tank in an automatic coating device. 2. The heating device comprises a jacket which covers the outer peripheral portion of the tank and is filled with a heating fluid inside, and a circulation pipe line for supplying the heating fluid discharged from the jacket into the jacket again. 2. A device for adjusting the viscosity of paint in a tank in an automatic coating device according to claim 1, further comprising a heater for heating a heating fluid flowing in the circulation pipe, the heater being controlled by a control device. . 3. The heating device comprises a heating pipe wound around the outer peripheral portion of the tank to form a closed pipe, and a heater for heating a heating fluid flowing in the heating pipe. The heater controls the heater. The viscosity control device for the paint in the tank in the automatic coating device according to claim 1, wherein 4. A heater for heating a sheet-shaped heating element that covers the outer peripheral portion of the tank, and the heating element is controlled by a control device. Viscosity control device.