KR100724167B1 - Spray painting apparatus and method of the same - Google Patents

Abstract

The present invention relates to a paint spraying device and method for controlling the concentration of the paint by adjusting the mixing ratio of the paint and air, the object of the present invention is to solve the problems of the prior art described above, which is supplied when spraying the paint By controlling continuously from small to large amount of air, it is possible to appropriately adjust the sprayed paint according to the complicated shape or coating characteristics of the material to be coated, improving paint quality and restraining unnecessary paint consumption. An object of the present invention is to provide an improved paint spraying device and method. The paint spraying device according to the present invention for achieving the above object is a paint spraying device for controlling the concentration of the paint by adjusting the mixing ratio of the paint and air, the air supply for supplying high-pressure air, and the air supply and Mixing mixing the flow rate continuous control unit with flow rate proportional control valve, the paint supply unit for supplying the paint, the air supplied from the flow rate continuous control unit and the paint supplied from the paint supply unit to continuously control the air supplied and connected And a paint spraying unit for atomizing and spraying the paint mixed with the air supplied from the mixing unit, and a painting robot for controlling the paint spraying unit to move around the material to be coated.

Painting, paint, spray, robot, control, flow rate, continuous

Description

Paint spraying apparatus and method {SPRAY PAINTING APPARATUS AND METHOD OF THE SAME}

1 is a block diagram of a paint spraying apparatus according to the prior art.

2 is a system diagram of a paint spraying apparatus according to the prior art.

3 is a block diagram of a paint spraying device according to the present invention.

4 is a device diagram of the paint spraying device according to the present invention.

5 is a circuit diagram showing a main circuit of the paint spraying apparatus according to the present invention.

6 is a work flow chart of the paint spraying apparatus according to the present invention.

<Explanation of symbols for the main parts of the drawings>

110: air supply unit 120: flow continuous control unit

122: flow rate proportional control valve 123: back pressure valve

127a, 127b: photocoupler 128a, 128b: gate IC

129: digital-to-analog converter 130: paint supply

140: mixing unit 150: painting robot

160: paint spraying unit

The present invention relates to a paint spraying device and method for controlling the concentration of the paint by adjusting the mixing ratio of the paint and air, and more particularly, to a paint spraying device and method for continuously adjusting the paint concentration during painting work will be.

In general, the painting operation is a work in which the operator injects the paint to add color to the surface of the coating material, by adjusting the mixing ratio of the paint and air to control the painting properties. Most of the painting work is performed by workers by hand. Therefore, the quality of the paint is generated according to the skilled state of the worker, the physical state of each worker, and the like.

In addition, the coating operation is the coating quality is determined according to the mixing ratio of the paint and air, when the mixing ratio of the air is low, the injection amount of the paint is increased, the amount of the paint is used, the coating is rough. On the other hand, when the mixing ratio of air is high, the amount of spray in the table decreases, the amount of paint used decreases, and the painting is multiplied. As such, when the mixing ratio of air is high, the coating process has to be repeated in order to obtain a desired coating thickness.

Therefore, a paint spraying device has been developed that can automatically obtain a coating of uniform quality by automating a painting work made by hand, and spray the paint in various forms according to the shape of the coating material.

1 is a block diagram of a paint spraying apparatus according to the prior art, Figure 2 is a system diagram of a paint spraying apparatus according to the prior art.

1 and 2, the conventional paint spraying device has a three-step flow rate control for controlling the air supply unit 10 for supplying air and the amount of air supplied from the air supply unit 10 step by step. The flow rate control unit 20 consisting of valves 22, 24, and 26, a paint supply unit 30 for supplying paint, and air supplied from the flow rate control unit 20 with the flow rate controlled from the paint supply unit 30. Mixing unit 40 for mixing the paint, and the paint spraying unit 60 for injecting the paint mixed with the air in the mixing unit 40. On the other hand, the paint spraying unit 60 is mounted on a painting robot for painting. In addition, the painting robot is provided with a robot control unit to control the operation of the painting robot (50).

In the above-described paint spraying device, the painting robot 50 is operated by compressed air at high pressure. This is to prevent the safety accidents such as ignition or explosion, since most paints contain flammable materials. In addition, in order to prevent the inflammable material from penetrating the workplace and the painting robot 50, all the electrical signals supplied to all the machinery used in the painting area may be changed to air pressure so that the machinery may be operated by pneumatic pressure. Pneumatic equipment is required.

The flow rate control unit 20 has three flow rate control valves 22, 24 and 26 having different valve gaps in parallel to adjust the amount of air mixed with the paint, and then has an appropriate amount of air discharge according to the amount of air. One of the flow control valves 22, 24, and 26 is opened to adjust the amount of air.

Here, the flow control valve (22, 24, 26) includes a pressure regulating relief valve for adjusting the pressure supplied to the air.

As described above, the conventional paint spraying device selects any one of three levels of the flow control valves 22, 24, and 26 according to the shape of the coating material to control the discharge of air. The injection amount is controlled step by step.

However, the conventional paint spraying apparatus and method cannot spray the paint in the intermediate stage of each stage as the air is discharged in three stages. Accordingly, there is a problem that can not spray a suitable amount of paint depending on the coating material. In other words, when the amount of air supplied is large, it is difficult to obtain a desired coating thickness due to the softening of the paint, and thus the inconvenience of having to repeat the painting operation. On the other hand, when the amount of air supplied is small, the amount of the paint used increases and the coating surface becomes rough.

An object of the present invention is to solve the problems of the prior art described above, the air supplied during the spraying of the paint to be continuously controlled from a small amount to a large amount is sprayed according to the complicated shape or coating properties of the coating material It is possible to provide a paint spraying device and method which can adjust paints appropriately, improve paint quality, suppress unnecessary consumption of paints, and improve economic efficiency.

The paint spraying device according to the present invention for achieving the above object is a paint spraying device for controlling the concentration of the paint by adjusting the mixing ratio of the paint and air, the air supply for supplying high-pressure air, and the air supply and Mixing mixing the flow rate continuous control unit with flow rate proportional control valve, the paint supply unit for supplying the paint, the air supplied from the flow rate continuous control unit and the paint supplied from the paint supply unit to continuously control the air supplied and connected And a paint spraying unit for atomizing and spraying the paint mixed with the air supplied from the mixing unit, and a painting robot for controlling the paint spraying unit to move around the material to be coated.

In addition, the flow rate continuous control unit may adjust the gap of the flow proportional control valve in accordance with the flow rate control signal. The flow proportional control valve may further include a back pressure valve for discharging an unnecessary amount of air.

In addition, the paint spraying method according to the present invention for achieving the above object is a paint spraying method for controlling the concentration of the paint by adjusting the mixing ratio of the paint and air, the flow rate for adjusting the flow rate of air during the paint spraying A determination step of determining whether a control signal is input, and an adjustment step of proportionally adjusting the flow rate of the air according to the flow rate control signal when the flow rate control signal is input as a result of the determination in the determination step.

On the other hand, the adjustment of the air amount in the adjusting step may be made by adjusting the gap of the proportional control valve.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a configuration diagram of the paint spraying apparatus according to the present invention, and FIG. 4 is a device diagram of the paint spraying apparatus according to the present invention.

As shown in FIGS. 3 and 4, the paint spraying device according to the present invention has a flow proportional control valve for continuously adjusting the air supply unit 110 for supplying air and the amount of air supplied from the air supply unit 110. The flow rate continuous control unit 120 having a 122, the paint supply unit 130 for supplying the paint, the air supplied from the flow rate continuous control unit 120 and the paint supplied from the paint supply unit 130 is mixed It consists of a mixing unit 140, and a paint spraying unit 160 for injecting a paint mixed with the air in the mixing unit 140. On the other hand, the paint spraying unit 160 is mounted on the painting robot 150 to perform the painting work. In addition, a robot controller is provided in the painting robot 150 to control the operation of the painting robot 150. On the other hand, the flow rate continuous control unit 120 and the robot control unit may be configured to control the operation by one control unit.

The air supply unit 110 is connected to the flow rate control valve 122 by an air supply line, and includes a pressure regulating relief valve so that a constant amount of air is always supplied.

On the other hand, the flow proportional control valve 122 continuously controls the amount of air supplied through the air supply line and supplies it to the mixing unit 140. To this end, the flow proportional control valve 122 is a control valve for continuously supplying and shutting off the amount of air, the back pressure for discharging excess air, that is, unnecessary amount of air from the air supplied to the proportional control valve 122 The valve 123 further includes.

In addition, the paint supply unit 130 supplies the paint to the mixing unit 140, so that the flow rate in the flow proportional control valve 122 is mixed with the controlled air.

Therefore, the spray paint, that is, the paint mixed with the air, supplied from the mixing unit 140 includes an appropriate amount of paint as it is mixed with a predetermined amount of air according to the object to be coated.

In this way, the paint mixed with a predetermined amount of air through the mixing unit 140 is supplied to the paint spraying unit 160, the paint spraying unit 160 injects the paint to the coating material. Here, the paint spraying unit 160 is configured to include a spray gun having a nozzle shape, and thus the paint spraying unit 160 may spray the paint in an atomized state through the spray gun.

In addition, the paint spraying unit 160 is provided with an intermittent valve (not shown) to control the opening and closing of the spray gun. Therefore, the paint is sprayed only when the On signal is transmitted to the intermittent valve, and when the Off signal is transmitted to the intermittent valve, the coating is stopped to maintain the standby state.

At this time, if the operator wants to increase the amount of air during the operation, when adjusting the flow rate continuous control unit 120 generates a signal for adjusting the open interval of the flow proportional control valve 122, accordingly the flow proportional control valve 122 is opened Increase the supply of air

On the other hand, the paint spraying unit 160 is to move around the object to be coated in accordance with the operation of the painting robot 150 to spray the paint.

The painting robot 150 is input before the operation in a program suitable for the shape of the material to be coated, and the painting operation is performed by the input program.

5 is a circuit diagram showing the main circuit of the paint spraying apparatus according to the present invention, when the operator operates the spray amount control switch (not shown) to adjust the spraying amount of the paint control unit of the paint spraying apparatus corresponds to the adjustment amount Generates 8 bits of data.

The 8-bit data is converted into a 5-volt signal through the photocouplers 127a and 127b. The 8-bit data is passed through the gate ICs 128a and 128b and then sent to the digital-analog converter 129 at an analog voltage of 0 [V]. It is converted into a signal of 5 [V]. The converted signal is transmitted to the flow rate control valve 122 to change the gap of the valve, thereby changing the amount of air introduced.

On the other hand, the photocoupler (127a, 127b) is the signal of the painting robot 150 is transmitted to the primary side, the secondary side is connected to the gate IC (128a, 128b). Since the primary coating robot 150 signal is a 24 [V] signal and the gate IC uses a 5 [V] signal, photocouplers 127a and 127b are used.

Looking at the operation of the paint spraying device according to the present invention configured as described above are as follows.

First, when the operator operates the paint spraying device, air is supplied from the air supply unit 110. The air supplied to the air supply unit 110 is supplied to the flow rate continuous control unit 120 through the air inlet line. At this time, the air supply unit 110 controls the relief valve installed in the air inlet line so that a predetermined amount of air is always supplied. The air supplied to the flow rate continuous control unit 120 is continuously controlled by the flow rate proportional control valve 122 and adjusts the supply amount of air without permission.

On the other hand, when the On signal is transmitted to the paint spraying unit 160 of the painting robot 150, the intermittent valve of the spray gun is opened to spray the paint mixed with air.

The operator grasps the painting state of the to-be-painted material, and performs painting work according to the painting information such as the type of paint, the painting speed, etc. input to the control unit (not shown) according to the shape and the painting characteristic of the to-be-painted material.

At this time, when the operator adjusts the injection volume control volume, the painting robot 150 generates an 8-bit unit command, the electrical signal is supplied to the flow rate control valve 122 via an electronic circuit.

The flow proportional control valve 122 adjusts the gap of the valve by the modified electric signal, thereby changing the injection amount of the paint.

As described above, when the paint amount adjustment volume is changed, as shown in the flowchart of FIG. 6, the process of adjusting the gap of the flow rate proportionality control valve 122 is repeatedly performed to perform continuous paint spraying operation.

Although the paint spraying apparatus and method according to the present invention have been described with reference to the illustrated drawings, the present invention is not limited to the embodiments and drawings described above, and the present invention belongs to the scope of the claims. Of course, various modifications and variations can be made by those skilled in the art.

The paint spraying apparatus and method according to the present invention configured as described above is controlled by the flow proportional control valve continuously controlled to spray the high pressure through the nozzle of the spray gun, according to the shape or coating characteristics of the coating material It is possible to spray the paint amount appropriately, and even when the spraying amount of the paint is varied according to the shape or coating characteristics of the coating material, continuous painting work can be performed without interruption of the work. In this way, the painting operation is carried out continuously, the yield is dramatically improved.

In addition, the present invention can gradually increase or decrease the amount of paint during painting, the operation proceeds while appropriately coping with the complicated shape or coating characteristics of the material to be coated, thereby increasing the efficiency of the work, and waste of unnecessary paint It can restrain and maintain the cleanliness of a workplace inside.

Claims (5)

A paint spray device that controls the concentration of the paint by adjusting the ratio of the paint and air, An air supply unit for supplying air, A flow rate continuous control unit in which a flow rate proportional control valve is installed to continuously control the air supplied to the air supply unit; A paint supply unit for supplying paint, A mixing unit for mixing the air supplied from the flow rate continuous control unit with the paint supplied from the paint supply unit; A paint spraying unit which receives and sprays the paint mixed with air in the mixing unit; And a painting robot for controlling the paint spraying unit to move around the coating material. The method according to claim 1, And the flow rate continuous controller adjusts a gap of the flow rate proportionality control valve according to a flow rate control signal. The method according to claim 1 or 2, The flow rate proportional control valve further comprises a back pressure valve for discharging an unnecessary amount of air. As a paint spraying method to control the concentration of the paint by adjusting the mixing ratio of the paint and air, A determination step of determining whether a flow control signal for adjusting the flow of air is input during the spraying of the paint; And a control step of proportionally adjusting the flow rate of the air according to the flow rate control signal when the flow rate control signal is input as a result of the determination in the determination step. The method according to claim 4, The control of the amount of air is a paint spraying method, characterized in that by adjusting the gap of the proportional control valve.

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