JPH057361U - Coating equipment - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to shorten the time required for the color-changed paint to reach the painting gun from the paint supply source. A color change valve device is provided with a paint supply extending from a painting gun and downstream ends of first and second paint introducing passages 12A and 12B extending from the first and second paint supply sources 10A and 10B. The upstream ends of the passages 30 are connected to each other. First and second paint introduction paths 12A, 12B
Are provided with first and second bypass passages 16A and 16B respectively having passage opening / closing valves 18A and 18B interposed therebetween, and a metering pump 32 is provided in the paint supply passage 30. The control unit 36 controls the passage opening / closing valves of the bypass passages 16A, 16B for a predetermined time after the color change valve device 34 switches the connection of the first or second paint introduction passages 12A, 12B to the paint supply passage 30. 18
A and 18B are opened and the metering pump 32 is stopped at the bottom dead center.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coating device, and more particularly, to an improvement of a coating device that supplies a coating gun by switching the type of coating material supplied from a plurality of coating material supply sources that supply different coating materials.

[0002]

[Prior Art]

 As the coating apparatus as described above, as illustrated in JP-A-63-123460, a paint introduction path for each paint extending from each of a plurality of paint supply sources for supplying different paints, and a coating gun. The paint supply path for supplying paint to the paint and the downstream end of the paint introduction path for each paint are connected, and the upstream end of the paint supply path is connected for each paint for the paint supply path. There is known one provided with a color change valve device for switching the connection of the paint introduction path.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned coating device, when the color change valve device switches the connection of the paint introduction passage for each paint to the paint supply passage, it is usually switched after cleaning the color change valve device and the paint supply passage with a cleaning agent. The paint is being introduced from the designated paint introduction route. In this case, in the above coating apparatus, a pressure reducing valve for reducing the pressure of the paint flowing through the paint introducing passage is usually provided in the paint introducing passage, and a fixed amount of paint is applied to the paint supply passage. A metering pump that pumps to For this reason, the paint pressure-fed from the paint supply source is decompressed by the pressure reducing valve when flowing through the paint introducing passage, and at the same time, the flow resistance of the metering pump is applied when flowing through the paint supplying passage. It takes a long time for the paint supplied through the paint introduction path on the other side, that is, the color-changed paint to reach the painting gun from the paint supply source through the paint introduction path, the color change valve device and the paint supply path. There is a problem of this.

In view of the above, it is an object of the present invention to reduce the time required for a color-changed paint to reach a coating gun from a paint supply source.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention reduces the pressure of a paint that has been pressure-fed during normal paint supply with a pressure reducing valve and also supplies a fixed amount of pressure from a metering pump to a coating gun while supplying a color change valve device. For a predetermined time immediately after switching the connection of the paint introduction path for each paint to the paint supply path, the paint that has been pumped is circulated without passing through the pressure reducing valve and the flow resistance in the metering pump is reduced.

Specifically, the solution means taken by the present invention is a paint introduction path for each paint extending from each of a plurality of paint supply sources for feeding different paints, and a paint supply path for supplying the paint to the coating gun. And a downstream end of the paint introduction path for each paint and an upstream end of the paint supply path are connected, and a color for switching the connection of the paint introduction path for each paint to the paint supply path. A change valve device, a pressure reducing valve provided in each paint introducing path for each paint, and a flow path opening / closing valve provided so as to bypass the pressure reducing valve in each paint introducing path for each paint. The bypass passage that is interposed, the metering pump that presses the inflowing paint that is interposed in the paint supply passage to the painting gun, and the color change valve device that is the paint introduction passage for each paint to the paint supply passage. Disconnect And a control means for opening the flow path opening / closing valve of the bypass path provided in the paint introduction path on the switched side and stopping driving the metering pump in the bottom dead center state for a predetermined time after replacement. To do.

[0007]

[Action]

 With the above configuration, the color change valve device introduces the paint for each paint into the paint supply path and the bypass path that is provided so as to bypass the pressure reducing valve in each paint introduction path for each paint. The color change valve device is provided with the control means for opening the flow path on-off valve and stopping the driving of the metering pump interposed in the paint supply path at the bottom dead center for a predetermined time after switching the path connection. At the specified time after the connection of the paint introduction path is switched, the color-changed paint that is pressure-fed from the paint supply source passes through the bypass path without passing through the pressure reducing valve, and the color change valve at high pressure. It is sent to the equipment and then pumped to the coating gun through a metering pump whose drive resistance is stopped at the bottom dead center state and the flow resistance is reduced. To use gun is sent immediately.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall structure of a coating apparatus according to an embodiment of the present invention. In the figure, 10 A is a first coating material supply source for pressure-feeding a first coating material, for example, red coating material at 5 kg / cm ² . 10B is a second paint supply source for pressure-feeding a ^second paint, for example, white paint at 5 kg / cm ² , 12A is a first paint introduction path extending from the first paint supply source 10A, and 12B is an extension from the second paint supply source. This is the second paint introduction path. Then, the first pressure reducing valve for reducing the pressure of the first and second paints fed at 5 kg / cm ² to the first paint introducing passage 12A and the second paint introducing passage 12B to 2-3 kg / cm ² , respectively. 14A and the second pressure reducing valve 14B are respectively provided. A first bypass passage 16A and a first bypass passage 16B that bypass the first pressure reducing valve 14A and the second pressure reducing valve 14B are provided in the first paint introducing passage 12A and the second paint introducing passage 12B, respectively. The first bypass opening / closing valve 18A and the second bypass opening / closing valve 18B for opening / closing the respective bypass paths 16A and 16B are provided in the first bypass opening 16A and the second bypass opening 16B, respectively. Further, 20 is a cleaning agent supply source for pressure-feeding a cleaning agent, for example, thinner, 22 is a cleaning agent introduction path extending from the cleaning agent supply source, 24 is a pressurized air supply source for supplying pressurized air, and 26 is pressurized air. It is a pressurized air introduction path extending from the supply source 24.

Further, in FIG. 1, 28 is a coating gun for spraying the coating material onto the object to be coated, 30 is a coating material supply passage for supplying the coating material to the coating gun 28, and the coating material supply passage 30 is provided with a solenoid valve. A metering pump 32 for moving the piston in the cylinder between the bottom dead center and the top dead center by opening and closing the pump and forcing the inflowing paint to the coating gun 28 by a fixed amount is provided. Further, the paint supply passage 30 is provided with an accumulator 33 for pushing the pulsation of the paint due to the operation of the metering pump 32.

Further, in the figure, reference numeral 34 indicates the respective downstream ends of the first paint introducing passage 12A, the second paint introducing passage 12B, the cleaning agent introducing passage 20 and the pressurized air introducing passage 26, and the paint. The color change valve device is connected to the upstream end of the supply passage 30. The color change valve device 34 includes a first paint opening / closing valve 34a for opening / closing the flow path of the first paint introducing path 12A, a second paint opening / closing valve 34b for opening / closing the flow path of the second paint introducing path 12B, and a cleaning agent introducing path. The cleaning agent opening / closing valve 34c for opening / closing the flow path 22 and the pressurized air opening / closing valve 34d for opening / closing the flow path of the pressurized air introduction path 26 are provided respectively, and the introduction paths 12A for the paint supply path 30 are provided. The connections of 12B, 22 and 26 are switched.

Further, in the figure, reference numeral 36 denotes a paint introduction which is switched for a predetermined time after the color change valve device 34 switches the connection of the first or second paint introducing passages 12A and 12B to the paint supply passage 30. A control unit as a control means for opening the first or second bypass opening / closing valves 18A, 18B of the bypass passages 16A, 16B of the passages 12A, 12B and opening the flow passage in the metering pump 32. As described below, the control unit 36 includes a first bypass opening / closing valve 18A, a second bypass opening / closing valve 18B, a first paint opening / closing valve 34a, a second paint opening / closing valve 34b, a cleaning agent opening / closing valve 34c, and a pressurized air opening / closing. The valve 34d and the metering pump 32 are controlled respectively. The first pressure reducing valve 14A and the second pressure reducing valve 14B are preset to reduce the pressure from 5 kg / cm ² to ² to 3 kg / cm ² .

The control contents of the control unit 36 at the time of color change will be described below with reference to the time chart of FIG.

First, in the coating process of the first paint, the first paint opening / closing valve 34 a is opened and the metering pump 32 is operated in a normal state to supply a fixed amount of the first paint to the coating gun 28.

When the coating process of the first paint is completed, the first paint opening / closing valve 34a is closed to move to the cleaning process, and the cleaning material opening / closing valve 34c and the pressurized air opening / closing valve 34d are alternately opened / closed. Then, the color change valve device 34, the paint supply passage 30, and the painting gun 28 are washed. Further, in order to reduce the flow resistance in the metering pump 32, the solenoid valve of the metering pump 32 is held in the open state, and the metering pump 32 is in the bottom dead center state, that is, through the cylinder of the metering pump 32. The driving of the paint supply passage 30 is stopped in a state where the paint supply passage 30 is connected to the front and rear of the metering pump 32.

When the cleaning process is completed, the second paint opening / closing valve 34b and the second bypass opening / closing valve 18B are opened and the metering pump 32 is continuously stopped in the bottom dead center state in order to move to the second paint supplying process. Keep it. By doing so, the second paint that has been pressure-fed from the second paint supply source 10B flows through the second bypass passage 16B without passing through the second pressure reducing valve 14B and reaches the color change valve device 34, and thereafter. The metering pump 32, which has been stopped at the bottom dead center and has a reduced flow resistance, quickly reaches the coating gun 28. In this way, the second coating material supply process is completed in about 15 seconds.

When the second paint supply step is completed, the second paint opening / closing valve 34b is continuously opened before the second paint coating step is started, while the second bypass opening / closing valve 18B is continuously opened for a predetermined time, for example, 3 seconds. A so-called dumping process is performed in which the second coating material is blown away while the metering pump 32 is opened and the driving is stopped at the bottom dead center.

After that, the second bypass opening / closing valve 18B is closed to allow the second paint to pass through the second pressure reducing valve 14B, and the metering pump 32 is operated to supply the metering amount of the second paint to the coating gun 28. Move to the second paint coating process.

When the second paint coating process is completed, the same operation as described above is performed to shift to the first paint coating process.

[0020]

[Effect of the device]

 As described above, according to the coating apparatus according to the present invention, the bypass passage which is provided so as to bypass the pressure reducing valve in each of the paint introducing passages for each paint and the passage opening / closing valve is interposed, and the color change valve device are provided. For a predetermined time after switching the connection of the paint introduction path for each paint to the paint supply path, open the flow path opening / closing valve of the bypass path provided in the paint introduction path on the switched side and interpose it in the paint supply path. The control means for stopping the operation of the fixed metering pump at the bottom dead center state is provided, so that the color change valve device is pressure-fed from the changed paint supply source for a predetermined time after switching the connection of the paint introduction path. The incoming paint is sent to the color change valve device at a high pressure through a bypass line that is not decompressed, and then is stopped at the bottom dead center state and the flow resistance is reduced. Because pumped rapidly into paint gun Te can paint the paint one Mari recombinant colors switched to rather large shorten the time to reach the painting gun from the paint supply source.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a coating apparatus that is an embodiment of the present invention.

FIG. 2 is a time chart when the paint is changed using the above coating device.

[Explanation of symbols]

 10A ... 1st paint supply source 10B ... 2nd paint supply source 12A ... 1st paint introduction path 12B ... 2nd paint introduction path 14A ... 1st pressure reduction valve 14B ... 2nd pressure reduction valve 16A ... 1st bypass path 16B ... 2nd Bypass passage 18A ... First bypass opening / closing valve 18B ... Second bypass opening / closing valve 20 ... Cleaning agent supply source 22 ... Cleaning agent introducing passage 24 ... Pressure air supplying source 26 ... Pressure air introducing passage 28 ... Painting gun 30 ... Paint Supply path 32 ... Metering pump 34 ... Color change valve device 36 ... Control unit (control means)

Claims (1)

[Claims for utility model registration] Claims: 1. A paint introduction path for each paint extending from each of a plurality of paint supply sources for feeding different paints, a paint supply path for supplying paint to a coating gun, A color change valve device for switching the connection of the paint introduction path for each paint to the paint supply path, the downstream end of the paint introduction path for each paint being connected to the upstream end of the paint supply path A pressure reducing valve provided in each of the paint introducing passages for each of the paints, and a bypass passage provided so as to bypass the pressure reducing valve in each of the paint introducing passages of the paints. A metering pump for pressure-feeding the inflowing paint flowing through the paint supply path to the coating gun, and after the color change valve device switches the connection of the paint introduction path for each paint to the paint supply path. Place A coating device comprising: a control means for opening a flow passage opening / closing valve of a bypass passage provided in the paint introduction passage on the side where the time is switched and for stopping the driving of the metering pump at the bottom dead center state. .