JPH01249147A - Spray coating method for quick-drying two-pack mixed paint and nozzle device therefor - Google Patents

Abstract

PURPOSE:To improve the efficiency in depositing a paint on a material to be coated by providing an atomizing air discharge port and a pattern control air discharge port at the tip of a spray nozzle. CONSTITUTION:When a quick-drying two-pack mixed paint is sprayed, an atomizing air is discharged from a discharge port 2 at the tip of the spray nozzle 1 toward a paint spray from a tip 4 to atomize the paint. The pattern control air is discharged from the plural discharge ports 3 at the tip of the nozzle to surround the paint spray in the form of an air curtain. When the tip 4 is clogged, the tip 4 capable of being turned through an angle of 180 deg. is turned and reversed by remote control, and the clogging solid matter is removed by the discharge force of the paint. As a result, the efficiency in depositing the paint on the material is increased. The nozzle clogging due to the quick-drying two-pack mixed paint can be eliminated by remote control, and the worker is not exposed to the undesirable environment.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention is a novel method that enables high adhesion efficiency when spray painting a quick-drying two-component mixed paint, and enables automatic painting. The present invention relates to a spray coating method and apparatus.

(Prior Art) FIG. 5 shows a perspective view of a nozzle portion of a conventional quick-drying two-liquid mixed paint spray coating device, which is generally commercially available. The tip 8 of the paint discharge port in the center of the spray nozzle body 7 has a tip rotation shaft 9 and a tip rotation cock 1.
0, and when the tip 8 is clogged with paint solid matter,
When a person visually discovers that the paint is not being discharged properly, the person immediately operates the tip rotation cock 10 to remove foreign matter stuck in the tip 8.

(Problems to be Solved by the Invention) However, conventional spray coating nozzles for quick-drying two-component mixed paints have the following problems.

(a) The paint adhesion efficiency to the object to be painted is low, and the paint consumption rate is poor.

Recently, some spray painting nozzles for general paints have a structure that combines airless and air systems to improve paint adhesion efficiency.

However, these nozzles cannot be used for quick-drying two-component mixed paints because no measures against nozzle clogging have been taken.

(b) To monitor the paint discharge state and rotate the tip to remove a clogged spray nozzle, a person must approach the tip of the nozzle, but paint mist may scatter around the nozzle, and environmental conditions may Since you will be working in a hostile environment, you will need to take precautions such as wearing protective clothing and masks at all times.

(8) Due to the operations described above, two or more people are required to carry out the painting work, including the person operating the painting machine itself.

(Means for Solving the Problems) The present invention is a method and apparatus that advantageously solves the problems described above, and its gist is as follows: (1) When spraying a quick-drying two-component mixed paint, Atomizing air is discharged from the tip of the spray nozzle toward the paint spray to atomize the paint, and pattern adjustment air is sent from multiple locations at the tip of the spray nozzle so as to surround the paint spray in an air curtain shape. When the spray nozzle tip becomes clogged, the tip of the spray nozzle, which is equipped with a 180-degree rotation function, can be turned in the opposite direction by remote control, and the paint ejection force can be used to
A spray coating method for a quick-drying two-component mixed paint, which is characterized by eliminating clogging solid matter.

(2) In a spray coating device for quick-drying two-component mixed paint,
A nozzle device for spray painting a quick-drying two-component mixed paint, characterized by having the following three mechanisms A, B, and C as an integrated structure.

(^) A mechanism that prevents paint from scattering around the surrounding area due to spraying, with an atomizing air outlet and a pattern adjustment air outlet provided at the tip of the spray nozzle. (B) The tip of the spray nozzle is attached to a rotating shaft that can rotate 180 degrees. (C) The rotating shaft equipped with the chip can be driven by pneumatic, hydraulic, or electric power. It is a mechanism that can be used as a driving source and remotely controlled.

That is, the present invention achieves the following advantages when spray painting a quick-drying two-component mixed paint: (a) By integrating a rotating nozzle mechanism to prevent nozzle clogging and an airless air spray nozzle to increase adhesion efficiency, One nozzle can perform two functions.

(b) The rotation of the nozzle tip can be controlled mechanically and remotely, solving the problems of the prior art and making it possible to perform painting advantageously.

Therefore, in response to (a), a structure is adopted in which a pattern adjustment air discharge port for discharging pattern adjustment air from the periphery toward the center of the nozzle is incorporated into the tip of the conventional rotating nozzle to improve the adhesion efficiency. The air discharged from the pattern adjustment air discharge port wraps around the paint discharged from the center of the nozzle in an air curtain shape, effectively preventing the paint from scattering around. For this purpose, it is effective to provide discharge ports in two or more directions, and the discharge angle is configured to enclose the paint spray. It is preferable that the pattern adjustment air be ejected uniformly from a plurality of ejection ports. Therefore, it is preferable that the supplied air is once stored in an air box and then sent to each of the ejection ports from there. Also, the tip of the rotating nozzle is configured to be rotated from the outside via the rotating shaft, and the structure is such that the supply air system and the rotating shaft do not intersect.

For (b), the rotary shaft should have a structure that can be mechanically driven by attaching an air source, hydraulic source, or electrically operated motor, etc., and the drive can be performed manually or with a flow rate display attached to the paint piping system. The structure shall be such that it can be remotely controlled by an abnormality detection signal from the device or pressure display device. The rotation axis is definitely 18
It has a structure that allows it to rotate 0 degrees and stop, so that solids clogging the nozzle can be reliably discharged using the paint ejection force.

(Example) Next, a first example of the method and nozzle device of the present invention will be described.
The temperature will be explained based on FIGS. 2 and 3.

FIG. 1 shows a perspective view of a nozzle device for spraying a quick-drying two-component mixed paint according to the embodiment.

Tip 4 of the paint outlet in the center of the spray nozzle body 1
An atomizing air outlet 2 and a pattern adjustment air outlet 3 are provided around the nozzle, and the air discharged from these two outlets wraps around the paint discharged from the center of the nozzle in an air curtain shape, causing the paint to scatter around the nozzle. The structure shall be designed to effectively prevent this.

The tip 4 is connected to a tip rotation shaft 5 and further to a tip rotation motor 6, and when the tip 4 is clogged with paint solids, etc., the tip 4 is connected to a flow rate display device, pressure display device, etc., which is installed artificially or in the paint piping system. The chip 4 is rotated 180 degrees by immediately operating the chip rotation motor 6 by mechanical remote control in response to the abnormality detection signal of the chip 4.
The structure is such that foreign matter clogged in the paint can be easily removed by the paint ejection force.

(Function) Next, the function of the lid of the present invention will be explained with reference to FIGS. 1, 2, and 3.

The atomizing air outlet 2 and the pattern adjustment air outlet 3 provided around the tip 4 of the paint outlet provided in the center of the spray nozzle body 1 improve the coating properties of the paint discharged from the center. The air discharged from the atomizing air outlet 2 acts as atomizing air on the paint spray, promotes atomization of the paint, and improves spray coating properties even for high-viscosity paint that is difficult to atomize. The air discharged from the pattern adjustment air discharge port 3 surrounds the paint spray like an air curtain, and effectively prevents the paint from scattering due to overspray.

FIG. 4 is an overall image diagram of an example of an apparatus for carrying out the method of the present invention. 1 is a spray nozzle body, 4 is a tip, 6 is a motor for rotating the tip, 11 is a static mixer,
12 is a manifold, 13 is a flow rate display device, 14 is a signal processing wiring, 15 is a paint pipe, 16 is a booster pump, 1
7 is an intermediate storage tank, 18 is a paint supply pump, and 19 is a paint container.The paint container 19 contains two liquids, A liquid and B liquid, and the paint supply pump 18 passes through the intermediate storage tank 17, and the pressure is increased. It is sent to the manifold 12 by a pressure pump 16. The two liquids sent to the manifold are further mixed by a static mixer 11 and discharged into the spray nozzle body.

The tip 4 has an integrated structure connected to a tip rotation motor 6 via a tip rotation shaft, and if the tip 4 becomes clogged with paint solids during paint dispensing and the paint stops being discharged, the tip will be removed immediately. The tip rotation motor 6 is automatically operated remotely by manually operating a switch on the control panel, or by using the abnormality detection signal 14 of the paint flow rate display device 13 or pressure display device installed in the middle of the paint pipe 15. When activated, the tip 4 is rotated 180 degrees, foreign matter stuck in the tip 4 is removed by the paint ejection force, and once the foreign matter has been discharged, the painting operation is started again.

FIG. 3 is a diagram showing a mode of removing foreign matter stuck in the chip. 1 is the spray nozzle body, 2 is the atomizing air outlet, 4 is the chip percentage, 5 is the chip rotation shaft, and 6 is the chip rotation motor. The chip rotation shaft 5 is connected to the chip 4 at right angles to the paint flow. If the chip becomes clogged with foreign matter, the motor shaft is rotated to rotate the chip 180 degrees in the opposite direction, and the paint is ejected to blow away the foreign matter from within the chip.

Next, the sheet pile 20 shown in FIG.
An example in which a two-component warm-mix paint is applied to the surface will be described.

In FIG. 5, A is a spray painting nozzle device of the present invention mounted on the tip of a painting robot 21 and remotely controlled by a nozzle remote control panel 22. In FIG.

In the figure, 23 is an air motor, 24 is a flow rate display device, 25
indicates a switching valve, and 26 indicates a coating machine.

This coating machine uses the L-T nailed steel sheet pile (80 mm) shown in Figure 7.
A two-component hot-mix paint was applied to a 0 mφ outer diameter x 9 m (11 plate thickness x 10 m pipe length) 20 under the following conditions.

Painting machine Two-liquid thermal paint machine tip unit support device Painting robot nozzle device Paint used in the device of the present invention and conventional nozzles
Two-component curable urethane resin coating degree: 40 to 50°C Discharge pressure: 100 to 150 Kg/cm2 Discharge amount: 2000 to 4500 g/win The results are shown in the following table.

(Paint Adhesion Efficiency) (Effects of the Invention) The following remarkable effects can be obtained by applying the quick-drying two-component mixed paint spray device of the present invention.

(b) The efficiency of paint adhesion to the object to be coated increases, thereby improving the paint consumption rate.

(0) The amount of paint scattered and floating is reduced, and the workplace environment is significantly improved. Additionally, the amount of discarded scattered paint is reduced.

(8) Nozzle clogging of quick-drying two-part mixed paint can be controlled remotely, eliminating the need for workers to be exposed to areas with poor environmental conditions.

(d) It is easy to paint everything yourself, the painting work is streamlined, and the painting cost is reduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a nozzle device for a spray device according to an embodiment of the present invention, Fig. 2 is a perspective view of the same nozzle section, Fig. 3 is a sectional view of Fig. 1, and Fig. 4 is an example of the coating method of the present invention. FIG. 5 is a perspective view of a conventional coating nozzle, FIG. 6 is an explanatory diagram of an example of a coating device using the nozzle device of the present invention, and FIG. 7 is an illustration of the material to be coated used in the example. It is a sectional view of a steel sheet pile. 1... Spray nozzle body, 2... Atomizing air outlet, 3... Air outlet for pattern adjustment, 4... Chip, 5... Chip rotation axis, 6... Chip rotation motor , 7...Spray nozzle body (conventional), 8...Tip (conventional), 9...Tip rotation shaft (conventional), 10...Chip rotation cock, 11...Static mixer (2 liquid warm), 12・
... Manifold, 13... Flow rate display device, 14... Signal processing wiring, 15... Paint piping (A liquid, B liquid), 16... Boost pressure pump, 17... Intermediate storage tank ( A liquid, B liquid), 18...
Paint supply pump (liquid A, liquid B), 19...paint container (
A liquid, B liquid), 20... Steel sheet pile, 21... Painting robot, 22... Nozzle remote control panel, 23... Air motor, 24... Flow rate display device, 25... Switching Valve, 26...painting machine. Figure 1 1 Nispray nozzle body 2: Atomizing air outlet 3: Air outlet for pattern adjustment 4: Chip 2nd Figure 4 = Chip 5: Chip rotation axis 1 Nispray nozzle body 2: Atomizing air outlet 4: Chip 5: Chip rotation axis 6: Chip rotation motor Yuichi Figure 4 1 person 4: Chip 6: Chip rotation motor! ! = Static mixer (heating of two liquids) 12: Manifold 13: Flow rate display device I4: Signal processing wiring 15 Two paint pipes (A liquid, B liquid) 16: Boosting pressure pump +7 = Intermediate storage tank (A liquid, B liquid) Liquid) 18:! ji department supply pump (liquid A, liquid B) 19:l! !
Container (Liquid A, Liquid B) Figure 5

Claims (1)

[Scope of Claims] 1. When spraying a quick-drying two-component mixed paint, atomizing air is discharged from the tip of the spray nozzle toward the paint spray to atomize the paint and at multiple locations at the tip of the spray nozzle. Air for pattern adjustment is discharged so as to surround the paint spray in an air curtain-like manner, and when the spray nozzle tip becomes clogged, the tip of the spray nozzle, which can be rotated 180 degrees, is rotated by remote control. A spray painting method for a quick-drying two-component mixed paint, characterized in that the paint is sprayed in the opposite direction, and clogging solid matter is removed by the paint discharge force. 2. A nozzle device for spray painting a quick-drying two-component mixed paint, which is characterized by having the following three mechanisms A, B, and C as an integrated structure in a spray painting device for a far-drying two-component mixed paint. (A) A mechanism that prevents paint from scattering around the surrounding area due to spray, which has an atomizing air outlet and a pattern adjustment air outlet at the tip of the spray nozzle. (B) A mechanism in which the tip of the spray nozzle is attached to a rotating shaft that can rotate 180 degrees, and when the tip is clogged with paint solids, the tip can be rotated 180 degrees and the solids can be removed by the paint ejection force. (C) A mechanism that uses pneumatic, hydraulic, or electric power to drive the rotating shaft on which the chip is attached, and can be controlled remotely.