JPH0233429B2 - NIEKIGATATORYONOTOSOSOCHI - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a coating device for two-component paint, and more specifically, to a coating device for two-component paint, and more specifically, for mixing a main paint and a curing paint to form a two-component paint. This invention relates to a two-component paint coating device that can maintain a constant mixing ratio of both paints.

[Conventional technology]

Conventionally, a coating apparatus as shown in FIG. 2 has been widely used when applying a two-component paint consisting of a base paint and a curing paint.

In FIG. 2, reference numeral 51 denotes a first paint tank in which the base paint is stored, and a second paint tank 52 is disposed in the vicinity of the first paint tank 51, inside which the base paint is stored. Contains a curing paint to be mixed with. Further, one end of a first supply pipe 53 through which the base paint passes is connected to the first paint tank 51. A first check valve 54 for preventing backflow of the curing paint is provided at the other end of the first supply pipe 53, and a first displacement pump 55 for supplying the main paint is provided in the middle. It is being

On the other hand, one end of a second supply pipe 56 through which the curing paint passes is connected to the second paint tank 52 . A second check valve 57 is provided at the other end of the second supply pipe 56 to prevent backflow of the main paint.
A second capacitive pump 58 for supplying the curing paint is provided in the middle.

Further, the first check valve 54 and the second check valve 57 are respectively connected to a connector 59 in which a T-shaped passage (not shown) is formed. The tips of the two are arranged to face each other, so that the main paint supplied from the first supply pipe 53 and the curing paint supplied from the second supply pipe 56 collide with each other.

Further, one end of a third supply pipe 60 is connected to one of the T-shaped passages of the connector 59. and,
The other end of this third supply pipe 60 is connected to a spray gun 61 that sprays a two-component paint T consisting of a base paint and a curing paint, and a spray gun 61 is connected to the other end of the third supply pipe 60 to uniformly mix the base paint and the curing paint. A static mixer 62 is provided.

Further, a pressure switch 63 is provided on the downstream side of the first pump 55 in the first supply pipe 53.
The pressure of the base paint passing through the supply pipe 53 is measured. Furthermore, the first pump 55
A controller 64 is disposed near the controller 64, and its input side is connected to the pressure switch 63 by a conductor 65a, and its output side is connected to the first pump 55 and the second pump 58 by conductors 65b and 65c. each connected. The pressure of the main paint is constantly measured by the pressure switch 63, and when the paint pressure drops below the set pressure, the first pump 55 and the second pump 58 are switched on by a signal from the controller 64. When the rotational speed increases and the paint pressure rises above the set pressure, the rotational speed of the second pump 55 and the second pump 58 is slowed down in response to a signal from the controller 64.

Then, apply the two-component paint T to the object to be painted (not shown).
When spraying, the first pump 55 and the second pump
The pump 58 is operated at the same time to cause the main paint to pass from the first paint tank 51 to the first supply pipe 53 and be supplied to the connector 59, and to pass from the second paint tank 52 to the second supply pipe 56 to be supplied to the connector. 59 is supplied. Both paints are then supplied to the static mixer 62 while being stirred in the passageway of the third supply pipe 60, where they are uniformly mixed, become a two-component paint T, pass through the third supply pipe 60, and are sent to the spray gun 61. At the same time, it is sprayed from the tip toward the object to be coated.

[Problem that the invention seeks to solve]

However, in such a two-component paint coating apparatus, when controlling the supply amount of the main paint and the curing paint, the pressure of the paint passing through the first supply pipe 55 must be set in the first supply pipe 55. When the pressure of the main paint drops below the set pressure, the first pump 55 and the second pump 5 are activated by a signal from the controller 64.
8 is increased to increase the paint pressure of both paints passing through the first supply pipe 53 and the second supply pipe 56 to the set pressure, and when the paint pressure of the base paint rises above the set pressure, the controller The rotation speed of the first pump 55 and the second pump 58 is delayed by the signal from the first supply pipe 53 and the second supply pipe 5.
6 is set so that the paint pressure of both paints passing through is lowered to a set pressure.

For this reason, if the set pressure range is widened, the response of the pressure switch 63 will be delayed and the mixing ratio of both paints will fluctuate, causing paint defects such as dripping and splatter.

On the other hand, if the set pressure range is narrowed, the pressure switch 63 will operate frequently during painting, and the supply amount of both paints will be small, causing the supply amount of the curing paint supplied to the painting gun 61 to fluctuate. There is a problem with the spray pattern being disrupted.

Therefore, the present invention was made to solve the above-mentioned problems. An air flow switch is provided in the compressed air supply pipe connected to the painting gun, and the main agent is controlled by the on/off signal of the air flow switch. By activating and stopping metering pumps for paint and curing paint, the mixing ratio of both paints in the paint is kept constant and the spray pattern is prevented from being disturbed.

[Means for solving problems]

That is, in the two-component paint coating apparatus according to the present invention, the main agent supply pipe leading to the main paint supply source and the auxiliary agent supply pipe leading to the curing paint supply source are connected to the mixing chamber via an on-off valve. The main agent supply pipe and the auxiliary agent supply pipe are each provided with a metering pump rotated by a drive motor. One end of the mixing chamber is connected to a paint supply pipe leading to a paint gun, and the paint gun is connected to an air supply pipe leading to a compressed air supply source.

Further, the air supply pipe is provided with an air flow switch, which detects the flow rate of air flowing inside the air supply pipe and turns on/off the air supply pipe. When the air flow switch is turned on, the drive motor that rotates each metering pump is activated, and when the air flow switch is turned on, the drive motor that rotates each metering pump is stopped.

[Effect]

In such a two-component paint coating device, at the same time as coating starts, atomizing air is supplied to the painting gun from a compressed air source through the air supply pipe, and the flow of the atomizing air is detected by an air flow switch. be done. This turns on the air flow switch, which activates the drive motor that rotates the base paint metering pump and the curing paint metering pump, and both metering pumps operate simultaneously, causing the base paint and curing paint to flow into the mixing chamber. is supplied. The two paints are then thoroughly mixed and supplied to a paint gun, where they are sprayed onto the object to be painted.

Simultaneously with the completion of painting, the supply of atomizing air to the air supply pipe is stopped, and the stop of the flow of atomizing air is detected by the air flow switch. As a result, the air flow switch is turned off, and the drive motor that rotates the main paint metering pump and the curing paint metering pump stops, and both metering pumps stop simultaneously, causing the main paint and curing paint to enter the mixing chamber. supply of paint will be stopped.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a two-component paint coating apparatus according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a schematic front view of a two-component paint coating apparatus according to the present invention.

In FIG. 1, reference numeral 1 denotes a first paint tank in which the base paint Ma is stored, and a second paint tank 2 is disposed near the first paint tank 1, and the base paint Ma is contained inside the second paint tank 2. A curing paint Mb that is mixed with the paint Ma to become a two-component paint M is stored therein.

Further, an electric motor 3 driven by electricity is arranged near the first paint tank 1 and the second paint tank 2, and a large gear 3b is fixed to the tip of the rotating shaft 3a. ing. A first gear pump 4 and a second gear pump 5 are arranged on both sides near the tip of the rotating shaft 3a, and the rotating shafts 4a and 5a of the respective gear pumps 4 and 5 are provided with small gears 4b, respectively. , 5b are fixed and engaged with the gear 3b of the electric motor 3. As a result, when the electric motor 3 operates, the gear 3b and the gear 4
b and 5b rotate synchronously, and the first gear pump 4 and the second gear pump 5 operate simultaneously.

Further, a mixing chamber 6 is arranged near the gear 3b of the electric motor 3, and a first two-way valve 7 and a second two-way valve 8 having passages in two directions are disposed on one side of the mixing chamber 6.
are provided for each. One of the outlet side passages of the first two-way valve 7 and the second two-way valve 8 is connected to the mixing chamber side.

Further, a first supply pipe 9a is arranged between the first paint tank 1 and the first gear pump 4, one end of which is inserted into the first paint tank 1, and the other end of the first supply pipe 9a of the first gear pump 4. Connected to the entrance side. And the first
A second valve is connected between the gear pump 4 and the first two-way valve 7.
A supply pipe 9b is provided, one end of which is connected to the outlet side of the first gear pump 4, and the other end connected to the inlet side passage of the first two-way valve 7.

Further, a third supply pipe 10a is arranged between the second paint tank 2 and the second gear pump 5, one end of which is inserted into the second paint tank 2, and the other end of the third supply pipe 10a of the second gear pump 5. Connected to the entrance side. A fourth supply pipe 10b is disposed between the second gear pump 5 and the second two-way valve 8, one end of which is connected to the outlet side of the second gear pump 5, and the other end of which is connected to the outlet side of the second gear pump 5.
It is connected to the inlet side passage of the two-way valve 8.

Further, a coating gun 11 is disposed near the mixing chamber 6, and a fifth supply pipe 12 is disposed between the coating gun 11 and the mixing chamber 6. and,
One end of this fifth supply pipe 12 is connected to the outlet side of the mixing chamber 6, and the other end is connected to the paint supply side passage of the coating gun 11. In addition, the fifth supply pipe 12
A static mixer 13 is provided in the middle of the mixing chamber 6 to uniformly mix the two-component paint M from the mixing chamber 6. Further, a sixth supply pipe 15 is arranged near the painting gun 11, one end of which is connected to the air supply side passage of the painting gun 11, and the other end connected to a compressed air supply source 16. An air flow switch 14 is provided in the middle of the sixth supply pipe 15, and the flow of air passing through the sixth supply pipe 15 is detected.

Further, a control device 17 is arranged near the first paint tank 1, and its output side is connected to the electric motor 3 by a conductive wire 18a. Furthermore, it is connected to the first two-way valve 7 and the second two-way valve 8 by conducting wires 18b and 18c, and the conducting wire 18d
The air flow switch 1 of the sixth supply pipe 15 is
Connected to 4. And this control device 17
The electric motor 3 is rotated by the electric motor 3, and each valve 7, 8 can be opened or closed as desired. In addition, 19 and 20 are regulators provided in the middle of the 1st supply pipe 9a and the 3rd supply pipe 10a, respectively.

In the coating apparatus configured as described above, a two-component paint coating apparatus will be described.

At the same time when the control device 17 operates based on the signal to start painting, atomizing air is supplied from the compressed air supply source 16 to the painting gun 11 through the sixth supply pipe 15. At this time, the flow of atomizing air passing through the sixth supply pipe 15 is detected by the air flow switch 14, the air flow switch 14 is turned on, and the detection signal is input to the control device 17.

Then, in the control device 17, a signal is transmitted to the electric motor 3 based on the input detection signal, and the electric motor 3 is rotated. Along with this, the rotating shaft 3a and the gear 3b rotate, and the rotation is transmitted to the gears 4b and 5b engaged on both sides, thereby operating the first gear pump 4 and the second gear pump 5.

At the same time, from the first paint tank 1 to the first supply pipe 9
a, the base paint Ma is supplied to the first two-way valve 7 through the first gear pump 4 and the second supply pipe 9b, and is also supplied from the second paint tank 2 to the third supply pipe 10
a, the hardening paint Mb is supplied to the second two-way valve 8 through the second gear pump 5 and the fourth supply pipe 10b.

In this state, a signal is issued from the control device 17 to the first two-way valve 7 and the second two-way valve 8, and both valves 7 and 8 are opened. By this, the first
A certain amount of the main paint Ma and the curing paint Mb supplied to the two-way valve 7 and the second two-way valve 8 are supplied to the mixing chamber 6, and the fifth supply pipe 12
The two-component paint M is uniformly mixed by a static mixer 13 provided in the paint M. Then, the two-component paint M is supplied from the fifth supply pipe 12 to the coating gun 11 and sprayed toward the object to be coated (not shown).

On the other hand, at the same time as the painting is completed, the supply of atomizing air to the sixth supply pipe 15 is stopped, and the air flow switch 14 detects that the flow of atomizing air has stopped, and the air flow switch 14 is turned off. The detection signal is input to the control device 17.

Then, in the control device 17, a signal is transmitted to the electric motor 3 based on the input detection signal, and the rotation is stopped. Along with this, the rotation of the rotating shaft 3a and the gear 3b is stopped, and the gear 3
The gears 4b and 5b engaged on both sides of b are stopped, both gear pumps 4 and 5 are also stopped at the same time, and the supply of the main paint Ma and the curing paint Nb is stopped.

〔Effect of the invention〕

As explained above, in the two-component paint coating apparatus according to the present invention, an air flow switch is provided in the compressed air supply pipe connected to the coating gun, and the main paint is controlled by the on/off signal of this air flow switch. Since the metering pumps for paint and curing paint are started and stopped, there is no delay in response during painting, so the mixing ratio of the main paint and curing paint does not fluctuate, preventing dripping and scaling. This has the effect of preventing the occurrence of coating defects such as.

In addition, in the two-component paint coating apparatus according to the present invention, the metering pump is activated and stopped by the on-off signal of the air flow switch, so the metering pump does not turn on and off frequently. Therefore, the amount of two-component paint supplied to the paint gun is always constant, which has the effect of making the spray pattern uniform.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a two-component paint coating apparatus according to the present invention. FIG. 2 is a schematic plan view of a conventional two-component paint coating apparatus. 1...First paint tank, 2...Second paint tank, 3...
Electric motor, 4...first gear pump, 5...second
Gear pump, 6... Mixing chamber, 7... First two-way valve, 8... Second two-way valve, 9a... First supply pipe, 9b... Second supply pipe, 10a... Third supply pipe, 10b...Fourth supply pipe, 11...Painting gun,
12...Fifth supply pipe, 14...Air flow switch, 15...Sixth supply pipe, 16...Compressed air supply source, 17...Control device, M...Two-component paint, Ma
...Main paint, Mb...Curing paint.

Claims (1)

[Claims] 1. A main agent supply pipe leading to the main paint supply source and an auxiliary agent supply pipe leading to the curing paint supply source are connected to the mixing chamber via an on-off valve, and each of the main agent supply pipe and the auxiliary agent supply pipe is A metering pump rotated by a drive motor is provided, and a paint supply pipe having one end leading to a paint gun is connected to the mixing chamber, and
An air supply pipe leading to a compressed air supply source is connected to the painting gun, and an air flow switch is provided on the air supply pipe, and an on/off signal from the air flow switch operates a drive motor that rotates each of the metering pumps.・A two-component paint coating device that is characterized by a stop function.