JPH0330856A - Polychromatic coating apparatus - Google Patents

Abstract

PURPOSE:To control a flow rate of a coating material supplied to a coating machine so finely and precisely as to enable a high quality coating to be carried out by installing a conduction controller for putting conduction pulses into a solenoid coil at a specified pulse cycle corresponding to a coating ejection quantity of the coating machine. CONSTITUTION:A flow rate control valve 4 is installed within a coating material piping 3 connecting a coating machine 1 with a color change valve equipment 2. An open-and-close speed of a needle valve 6 and a conducting period through a solenoid coil 14 of that valve 4 are controlled by changing the conducting period and pulse cycle of the conduction pulses put into the solenoid coil 14 from a conduction controller 13. A flow rate of the coating material supplied from the color change valve equipment 2 to the coating machine is controlled finely and precisely so as to carry out a coating of high quality by this apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-color coating device in which paints for each color are selected under pressure from a paint supply source and are supplied to a coating machine using a color change valve device.

(Prior Art) In order to perform uniform multi-color coating, each color paint selected by a color change valve device must be supplied at a constant rate to a coating machine at a predetermined flow rate depending on the paint discharge amount.

For this reason, in the past, a pressure regulating valve (air-operated paint regulator) was installed in each paint supply pipe that pumped the paint from the paint supply source for each color paint to the color change valve device. (Refer to Publication No. 1106)
Alternatively, a pressure regulating valve may be interposed in the paint piping connecting the paint machine and the color change valve device (Japanese Patent Laid-Open No. 60-6107).
(see Publication No. 7), the flow rate of paint supplied to the coating machine is adjusted by adjusting the opening degree of these pressure regulating valves.

In addition, a gear pump is installed in the paint pipe that connects the paint machine and the color change valve device, increasing the number of rotations to 11! ! A means to adjust the flow rate of paint by ff has also been proposed (
(Refer to Japanese Utility Model Application Publication No. 63-20973) [Problem to be solved by the invention] However, when adjusting the opening degree of a valve such as a pressure regulating valve, it is not possible to finely adjust the flow rate of the paint. However, the drawback was that high-quality painting could not be achieved.

On the other hand, gear pumps have excellent quantitative performance and can finely adjust the flow rate of paint, but when installed in the paint piping connected between the paint sprayer and the color change valve device, it is possible to control the paint color change. In some cases, it takes time to clean the paint adhering to the gears of the gear pump, making it impossible to quickly change the color.

Note that this gear pump is installed in each paint supply pipe connected between the paint supply source for each color paint and the color change valve device, and the flow rate of the paint fed to the color change valve device by the gear pump is adjusted. For example, it is possible to quickly change colors, but in this case, an expensive gear pump is required for each paint, which has the disadvantage of increasing equipment costs.

Therefore, the present invention makes it possible to finely adjust the flow rate of paint supplied from a color change valve device to a paint sprayer, and to quickly change the color of the paint without increasing equipment costs. This is considered a technical issue.

[Means to solve the problem]

In order to solve this problem, the multi-color coating device according to the present invention provides a multi-color coating system that connects paint pipes connected between a coating machine and a color change valve device that selectively supplies each color of paint to the coating machine. A regulating valve is interposed, and the valve has a needle valve whose valve element is pressed against the valve seat by a spring in the valve closing direction, a movable core fixed to the two-dollar valve, and a movable core. The solenoid coil lifts up against the elasticity of the spring, and the solenoid coil is provided with an energization controller that inputs energization pulses at a predetermined pulse cycle according to the amount of paint discharged from the paint sprayer. Features.

[Effect]

According to the present invention, when an energization pulse is input from the energization controller to the solenoid coil of the flow control valve installed in the paint pipe connected between the paint machine and the color change valve device, the solenoid coil is energized. The movable core is
The needle valve is lifted up in the valve opening direction against the elasticity of the spring, and the valve body of the needle valve to which the movable core is fixed separates from the valve seat and opens.

Next, when the energization pulse is cut off, the valve body of the needle valve is pressed against the valve seat by the elasticity of the spring, and the valve is closed.

Since this energization pulse is input at a predetermined pulse cycle, the needle valve of the flow rate regulating valve vibrates at a frequency corresponding to the pulse cycle and repeats the above-mentioned opening/closing operation at a high speed. Paint is discharged to the coating machine at a flow rate that corresponds to the time when the solenoid coil is energized.

Therefore, by changing the energization time and pulse period of the energization pulse input from the energization controller to the solenoid coil,
By adjusting the opening/closing speed of the needle valve and the energization time of the solenoid coil, the flow rate of paint supplied to the paint sprayer can be finely adjusted.

In addition, when changing the color of paint, stop the supply of paint from the color change valve device, leave the flow rate adjustment valve in operation, and connect the cleaning air supply valve and cleaning solvent provided in the color change valve device. The supply valve may be opened and closed alternately.

At this time, the interior of the flow rate regulating valve does not have a complicated shape or structure like a gear pump, and cleaning does not take much time, so the color can be quickly changed.

Note that the flow control valve according to the present invention is not limited to being installed in a paint pipe that connects a paint sprayer and a color change valve device, but is also applicable to a paint supply that connects a paint supply source for each color paint and a color change valve device. It may be installed in each of the piping, in this case,
Although a flow control valve must be provided for each paint, the equipment cost is lower than when a gear pump is provided.

〔Example〕

Embodiments of the present invention will be specifically described below based on the drawings.

Fig. 1 is an overall view showing an example of a multi-color coating device according to the present invention, Fig. 2 is a cross-sectional view of the flow N control valve, and Fig. 3 is an energization pulse input from the energization controller to the solenoid coil of the flow control valve. FIG. 2 is a diagram showing the energization time and pulse period of

The multi-color painting device shown in this example has a paint pipe 3 connected between the paint sprayer 1 and the color change valve device 2, and the flow rate of the paint supplied to the paint sprayer 1 is adjusted to the paint discharge amount of the paint sprayer 1. A flow control valve 4 is interposed to adjust the flow rate accordingly.

The flow control valve 4 has one end of a needle valve 6 provided in the body 5 in which paint is supplied from the color change valves C■, ~Cv, which are arranged in parallel on the manifold 7 of the color change valve device 2. A valve body 9 is provided to open and close the paint discharge port 8 to be discharged to the paint sprayer 1 side, and a movable core 12 is provided on the other end side to press the valve body 9 of the needle valve 6 against the valve seat 11 with the elasticity of a spring 10. It is being

Further, a solenoid coil 14 is provided in the body 5 to lift up the movable core 12 against the elasticity of the spring 10 every time an energization pulse transmitted from the energization controller 13 at a predetermined pulse cycle is input. ,
A stopper 16 is provided that collides with the flange portion 15 of the fully opened needle valve 6 by lifting up the movable core 12, and the needle valve 6 corresponds to the gap provided between the flange portion 15 and the stopper 16'. It is designed to open and close by vibrating with each stroke.

In addition, the body 5 has connector parts 17 and 18 formed at both left and right ends for connecting to the paint pipe 3, and a lead wire 19 for inputting the energization pulse sent from the energization controller 13 to the solenoid coil 14. An electrical connector portion 2° is formed for this purpose.

The needle valve 6 is formed of a hollow pipe P, and one end of the hollow pipe P is provided with a paint outlet 21 that opens near the valve body 9, and the other end is opened toward the connector portion 18. This serves as a paint inlet 22.

Further, the paint pipe 3 and the pipe 23 of the lead wire 19 are insulated pipes such as Teflon pipes.

Next, as shown in FIG. 3(a), the energization controller 13 transmits an energization pulse having an energization time Ti at a pulse period Tz.

Here, when the energization pulse is input to the solenoid coil 14 of the flow rate adjustment valve 4 and the needle valve 6 opens, the amount of paint discharged from the paint discharge port 8 to the coating machine 1 side is calculated as follows. Although it depends on the stroke of the valve 6, the opening area of the paint discharge port 8, the pressure inside and outside of the paint discharge port 8, etc., once these are determined, the opening time of the needle valve 6, that is, the energization pulse energization Determined by time Ti.

The amount of paint discharged per unit time by the opening/closing operation of the needle valve 6 is determined by the energization time Ti and pulse period Tz of the energization pulse.

Therefore, as shown in FIG. 3, the pulse period Tz is kept constant (for example, 10 m5) and the energization time Ti is changed, or as shown in FIG.
By keeping constant and changing the pulse period Tz,
The amount of paint discharged can be freely adjusted.

However, no matter which method is used, in order to open and close the needle valve 6 correctly, it is necessary to provide a certain pause time between the time when the energization pulse is cut off and the time when the next energization pulse is input. The pause time T r ast is required to be at least about 0.6 m s.

Thus, from the color change valve device 2, each color change valve cv, -
When supplying the paint selected by cv to the coating machine 1, the energization controller 13 supplies the solenoid coil 14 of the flow control valve 4 with a predetermined pulse period Tz that is preset according to the paint discharge amount of the coating machine 1. When the energization pulse with the energization time Ti is input, the needle valve 6 vibrates at high speed to open and close, and the paint supplied from the color change valve device 2 is transferred from the paint discharge port 8 of the flow control valve 4 to the coating machine 1 side. It is continuously discharged at a predetermined flow rate without interruption.

That is, the flow rate control valve 4 is opened and closed at a predetermined opening/closing speed corresponding to the pulse cycle Tz of the energization pulse input to the solenoid coil 14, and the paint sprayer 1 is maintained at a constant flow rate determined by the opening/closing speed and the energization time Ti. supplies paint to

Therefore, by changing the opening/closing speed by changing the pulse period Tz, or by changing the energization time Ti, the flow rate of paint supplied to the coating machine 1 can be subtly and accurately adjusted.

Note that although the stroke of the needle valve 6 and the opening area of the paint discharge port 8 are always constant, the pressure of the paint may vary due to changes in its viscosity, etc.
Changes in pressure are detected by pressure sensors 24 and 25 provided on both sides of the flow rate control valve 4, and the energization time Ti of the energization pulse transmitted from the energization controller 13 or its pulse period Tz is determined according to the pressure change. can be variably adjusted.

Moreover, when stopping the supply of paint to the coating machine 1 and changing the color of the paint, the color change valves cv and -CV are used.

With the valve closed and the flow rate adjustment valve 4 operated, cleaning air and cleaning solvent are alternately supplied from the cleaning air supply valve AV and cleaning solvent supply valve S, which are provided on the manifold 7 of the color change valve device 2. Bye.

In the above embodiment, a case has been described in which the flow control valve 4 is installed in the paint pipe 3 connected between the coating machine 1 and the color change valve device 2, but the present invention is not limited to this.
The flow control valve 4 is connected to the paint supply source B+- for each color paint.
Bs and each color change valve CV of color change valve device 2 l=C
Paint supply pipe 26.26・- connected between Vs
The flow rate of the paint pumped from each paint supply pipe 26 to each color change valve cv, -CV by the pump 27 may be adjusted.

In this case, a flow control valve 4 is required for each paint, but the equipment cost is very low compared to the case where a gear pump is used as the pump 27 and its rotation speed is adjusted.

In addition, as shown in FIG. 4, the flow control valve 4 has a paint inlet 28 bored in the peripheral wall of the body 5 near the valve body 9, instead of using a hollow pipe as the needle valve 6. 28 may be formed with a connector portion 18 projecting in a direction perpendicular to the connector portion 17 on the paint discharge port 8 side.

Note that in FIG. 4, parts corresponding to those in FIG. 1 are given the same reference numerals, and detailed explanation thereof will be omitted.

〔Effect of the invention〕

As described above, according to the present invention, the amount of paint supplied from the color change valve device to the paint sprayer can be adjusted without increasing the equipment cost of the multicolor painting device and without hindering quick color changes of the paint. This has the very valuable effect of being able to finely and accurately adjust the flow rate to achieve high quality coating.

[Brief explanation of drawings]

Fig. 1 is an overall view showing an example of a multicolor coating device according to the present invention, Fig. 2 is a cross-sectional view of its flow rate regulating valve, and Fig. 3 is a flow chart showing the flow rate from the energization controller. A diagram showing the energization time and pulse period of the energization pulse input to the solenoid coil of the adjustment valve, and FIG. 4 is a sectional view of a flow rate adjustment valve showing another embodiment of the present invention. Explanation of symbols 1...-Painting machine, 2-Color change valve device, 3-Paint piping,
4--Flow rate adjustment valve, 6--needle valve, 9-valve body, 10--spring, 11--valve seat, 12--
Movable core, 13-Electrification controller, 14-Solenoid coil, 26-Paint supply piping.

Claims (1)

[Scope of Claims] [1] A flow control valve ( 4) is interposed, and the valve (4) is biased in the valve closing direction to press the valve body (9) against the valve seat (11) by the spring (10), and the needle valve (6). It consists of a movable core (12) fixed to the valve (6), and a solenoid coil (14) that lifts up the movable core (12) against the elasticity of the spring (10). (14) is an energization controller (
13) A multicolor coating device characterized by being provided with. [2] A multicolor coating device in which the flow rate control valve (4) is interposed in a paint supply pipe (26) that pressure-feeds each color paint to the color change valve device (2).