JP2516514Y2 - Coating equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus, and more particularly, to an improvement of a coating apparatus that switches a type of coating material supplied from a plurality of coating material supply sources supplying different coating materials and supplies the coating material to a coating gun.

[0002]

2. Description of the Related Art As a coating apparatus as described above, as shown in Japanese Patent Laid-Open No. 63-123460, a paint introduction path for each paint extending from each of a plurality of paint supply sources for supplying different paints. A paint supply path for supplying 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 to the paint supply path. There is known one provided with a color change valve device for switching the connection of the paint introduction path for each paint.

[0003]

However, in the above-mentioned coating apparatus, when the color change valve device switches the connection of the paint introduction path for each paint to the paint supply path, the color change valve apparatus and the paint supply path are usually used. The paint is introduced through the switched paint introduction path after the paint is washed with the cleaning agent. In this case, in the above-mentioned coating apparatus, normally, a pressure reducing valve for reducing the pressure of the paint flowing through the paint introducing passage is provided in the paint introducing passage,
A metering pump that pumps a fixed amount of paint to the coating gun is installed in the paint supply path. 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 also the flow resistance of the metering pump is passed when flowing through the paint supplying passage. It takes a long time for the paint supplied through the paint introduction path, 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.

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 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 feeds a fixed amount from a metering pump to a coating gun. On the other hand, while the color change valve device switches the connection of the paint introduction path for each paint to the paint supply path, the paint that has been pressure-fed is circulated without passing through the pressure reducing valve for a predetermined period of time, and at the same time, the metering pump. It is intended to reduce the distribution resistance in.

Specifically, the solution provided 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. A color change valve 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 device, a pressure reducing valve provided in each of the paint introducing passages for each paint, and a flow passage opening / closing valve provided so as to bypass the pressure reducing valve in each of the paint introducing passages for each paint. Bypass road,
A metering pump that pressurizes the paint flowing through the paint supply path to the coating gun, and a cleaning agent introduction path and pressurized air introduction that supplies the cleaning agent and processing air to the color change valve device during the cleaning process. A cleaning mechanism having a passage, and, after cleaning the color change valve device by the cleaning mechanism, switching the connection of the paint introduction passage for each paint to the paint supply passage for a predetermined time. In a state in which the flow passage opening / closing valve of the bypass passage provided in the paint introduction passage on the fixed side is opened and the metering pump is communicated with the metering pump through the cylinder of the metering pump in the upstream and the downstream of the metering pump. And a control means for stopping driving.

[0007]

With the above-described structure, the bypass passages provided so as to bypass the pressure reducing valve in each of the paint introduction passages for each paint and the passage opening / closing valve interposed, and the color change valve device to supply the paint after the cleaning process For a predetermined time after switching the connection of the paint introduction path for each paint to the path, the flow passage opening / closing valve is opened and the metering pump installed in the paint feeding path is connected to the paint feeding path through the cylinder of the metering pump. Since the color change valve device is provided with the control means for stopping the drive in a state in which it is in communication with the upstream and downstream of the metering pump, the color change valve device is pressure-fed from the paint supply source for a predetermined time after switching the connection of the paint introduction path. The color-changed paint is sent to the color change valve device at a high pressure through the bypass passage without passing through the pressure reducing valve, and then the paint supply passage upstream and downstream of the metering pump. Since the drive stop in a state where the communicating flow resistance is pumped into paint gun through the metering pump with reduced cylinders, color change paint is sent immediately from the paint supply source to the paint gun.

[0008]

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

[0009] Figure 1 shows the overall configuration of a coating device according to an embodiment of the present invention, in the figure, 10A is the first paint supply source for pumping the first coating for example a red paint 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 a second paint supply passage extending from the second paint supply source. It is a paint introduction route. Then, the first paint introduction path 12A and a second paint introduction path 12B, the first pressure reducing valve 14A of each depressurizing the first and second coating material which has been pumped by 5 kg / cm ² to 2-3 kg / cm ² And the second pressure reducing valve 14B are provided respectively. Further, the first paint introduction passage 12A and the second paint introduction passage 12B are provided with 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, respectively. A first bypass opening / closing valve 18A and a second bypass opening / closing valve 18B for opening / closing the bypass paths 16A and 16B are respectively provided in the first bypass path 16A and the second bypass path 16B. Further, 20 is a cleaning agent supply source for pumping a cleaning agent, for example, thinner, 22 is a cleaning agent introduction path for supplying a cleaning agent to a color change valve device 34, which will be described later, during the cleaning process, and 24 is an additional element. A pressurized air supply source 26 for supplying pressurized air extends from the pressurized air supply source 24 and is a pressurized air introduction path for supplying pressurized air to a color change valve device 34, which will be described later, during a cleaning process. It constitutes the cleaning mechanism.

Further, in the figure, 28 is a coating gun for spraying the coating material onto the object to be coated, 30 is a coating material supply path for supplying the coating material to the coating gun 28, and the coating material supply path 30 is
A metering pump 32 that moves the piston in the cylinder between the bottom dead center and the top dead center by opening and closing the solenoid valve and pressure-feeds the inflowing paint to the coating gun 28 is provided. A metering pump 32 is provided in the paint supply passage 30.
An accumulator 33 for pressing the pulsation of the paint due to the operation of is provided.

Further, in the figure, 34 is a first paint introducing path 12A, a second paint introducing path 12B, and a cleaning agent introducing path 22.
And a downstream end of the pressurized air introduction passage 26 is connected, and an upstream end of the paint supply passage 30 is connected. The color change valve device 34 includes a first paint opening / closing valve 34a that opens and closes the flow path of the first paint introducing path 12A, a second paint opening / closing valve 34b that opens and closes the flow path of the second paint introducing path 12B, and a cleaning agent introducing path 22. Is provided with a cleaning agent opening / closing valve 34c for opening / closing the flow path of the pressurized air introducing passage 26 and a pressurized air opening / closing valve 34d for opening / closing the passage of the pressurized air introducing path 26, respectively.
Switch the connection of 2,26.

Further, in the figure, reference numeral 36 denotes a paint introduction which has been switched for a predetermined time after the color change valve device 34 switches the connection of the first or second paint introducing passage 12A, 12B to the paint supply passage 30. Road 12A, 12
A control unit as a control means for opening the first or second bypass opening / closing valve 18A, 18B of the bypass passage 16A, 16B of B and opening the flow passage in the metering pump 32.
Is the first bypass opening / closing valve 18 as described below.
A, second bypass opening / closing valve 18B, first paint opening / closing valve 34
a, the second paint opening / closing valve 34b, the detergent opening / closing valve 34c, the pressurized air opening / closing valve 34d, and the metering pump 32 are controlled.
Note that the first pressure reducing valve 14A and the second pressure reducing valve 14B is previously set to perform the decompression from 5 kg / cm ² to 2-3 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 step of applying the first paint, the first paint opening / closing valve 34a is opened and the metering pump 32 is operated in a normal state to supply the metering 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,
The cleaning agent on-off valve 34c and the pressurized air on-off valve 34d are alternately opened and closed to wash the color change valve device 34, the paint supply passage 30, and the painting gun 28. Further, in order to reduce the flow resistance in the metering pump 32, the solenoid valve of the metering pump 32 is held in an open state, and the metering pump 32 is metered through the cylinder of the metering pump 32 in the paint supply passage 30. The drive is stopped in a state where the pump 32 is in communication with the upstream and downstream of the 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 supplied to the metering pump 32 in order to move to the second paint supplying step. Driving is stopped while the path 30 is in communication. In this way, 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 is stopped in a state where the paint supply passage 30 upstream and downstream is in communication with the metering pump 32, and flows through the cylinder of the metering pump 32 whose flow resistance is reduced to reach the coating gun 28 quickly. In this way, the second coating material supply process is completed in about 15 seconds.

When the second paint supply process is completed, the second paint opening / closing valve 34b is continuously opened before the second paint coating process 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 step is performed in which the second paint is blown away while the metering pump 32 is opened and the driving of the metering pump 32 is stopped with the paint supply passage 30 upstream and downstream of the metering pump 32 being communicated.

Thereafter, 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. 2 Move to the paint painting process.

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

[0020]

As described above, according to the coating apparatus of the present invention, a passage opening / closing valve (bypass opening / closing valve) is provided in each of the paint introducing passages for each paint so as to bypass the pressure reducing valve. During the predetermined time after switching the connection between the bypass passage and the color change valve device for each paint to the paint supply passage after the cleaning process,
Open the flow path opening / closing valve of the bypass path provided in the paint introduction path on the switched side and connect the metering pump installed in the paint supplying path to the paint supplying path through the cylinder of the metering pump. Since the control means for stopping the drive in the state of being communicated downstream is provided, at the predetermined time after the color change valve device switches the connection of the paint introduction path,
Paint that is pressure-fed from the switched paint supply source is sent to the color change valve device at a high pressure through a bypass path that is not decompressed, and then the drive is stopped with the paint supply path upstream and downstream of the metering pump communicating. Since the flow resistance is reduced and the pressure is quickly fed to the painting gun through the cylinder of the metering pump, the changed paint, that is, the color-changed paint, is required to reach the painting gun from the paint supply source. The time can be greatly shortened.

[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 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 ... 1st bypass opening / closing valve (flow passage opening / closing valve) 18B ... 2nd bypass opening / closing valve (passage opening / closing valve) 20 ... Cleaning agent supply source 22 ... Cleaning agent introduction path 24 ... Pressurized air supply source 26 ... Addition Compressed air introduction path 28 ... Painting gun 30 ... Paint supply path 32 ... Metering pump 34 ... Color change valve device 36 ... Control unit (control means)

Claims (1)

(57) [Scope of utility model registration request] 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, and a downstream of the paint introduction path for each paint. A color change valve device for connecting each of the ends and an upstream end of the paint supply path for switching the connection of the paint introduction path for each paint to the paint supply path, and the paint introduction path for each paint And a bypass passage provided in each of the paint introducing passages for each of the paints so as to bypass the pressure reducing valve, and a passage opening / closing valve interposed therein, and the paint supply passage. the paint is set influx metering pump for pumping the gun for the painting, the mosquito
Cleaning agent and pressurization during the cleaning process
Cleaner introduction path for supplying air and pressurized air introduction
A cleaning mechanism having a passage, and the above-mentioned color check by the cleaning mechanism.
After the cleaning of the change valve device , the color change valve device switches the connection of the paint introduction path for each paint to the paint supply path for a predetermined time and then the bypass path provided in the paint introduction path on the switched side. Open the flow path opening / closing valve and set the metering pump to the cylinder of the metering pump.
The above paint supply path is connected to the upper and lower ends of the metering pump via
A coating device, comprising: a control means for stopping driving in a state of being passed .