JPH04134448U - Grid electrode device for rotary atomizing electrostatic coating machine - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the occurrence of leaks and enable safe application of water-based paints. [Structure] A predetermined number of air outlets (21) provided so as to surround the outer peripheral surface of the base end (16) of the grid electrode (11), and an air supply means for supplying air to the air outlets (21). (31).

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a grid electrode device for a rotary atomizing electrostatic coating machine.

0002

[Conventional technology]

Figure 4 shows an example of a conventional rotary atomizing electrostatic coating machine.

0003 Conventionally, as a rotary atomizing electrostatic atomizer, atomization is performed by a bell 3 that rotates in a predetermined direction. The painted paint P is negatively charged using the grid electrode device 1A, and the positive electrode side (earth side) is It is known to be attached to objects to be painted (not shown), and is used for painting automobile bodies, etc. It's being used.

0004 This electrostatic coating machine includes a bell support 2 that rotatably supports a bell 3, and a bell support 2 that rotatably supports a bell 3. Generally, the grid electrode device 1A is attached to the grid electrode device 1A. be.

[0005] Specifically, the bell 3 is attached to the bell support 2 via the hollow shaft 8 as shown in FIG. Rotationally supported. This hollow shaft 8 is connected to the bell support 2 via an air bearing 8A. 20,000~ by air turbine 8B. It is configured to be rotated at a high speed of 6,000 rpm. In addition, the hollow shaft 8 The paint supply pipe 6 is inserted without contact, and the paint P is supplied from the paint supply pipe 6 into the hollow. It is configured such that it flows inside the shaft 8 along the axis 9 and is supplied to the bell 3.

[0006] Note that the bell support 2, the bell 3, and the paint supply pipe 6 described above are grounded. On the other hand, the grid electrode device 1A is connected to a bell via an electrically insulating cylindrical body 19. A predetermined number (for example, 6 pieces) arranged so as to surround the support body 2 (and bell 3) The grid electrode 11 is configured to include a grid electrode 11.

[0007] As shown in FIG. 5, each grid electrode 11 includes an insulating cylinder 12, a current limiting resistor 13, and It consists of a discharge part (for example, a discharge pin 14), and is insulatingly bonded to a cylindrical body 19. (The above-mentioned current limiting resistor 13 is used to prevent sudden changes in current value and to so that the short-circuit current value flowing through the electrical pin 14 is below a predetermined value (for example, 500 μA). It is a restriction. In addition, the grid electrode 11 (current limiting resistor 13) is connected to a high voltage ( For example, a power supply cable 4 for applying -65 kV is connected.

[0008] By the way, the paint P includes an organic solvent-based paint that uses thinner etc. as a solvent, and an organic solvent-based paint that uses water as a solvent. There are water-based (water-soluble, aqueous) paints that use solvents. Organic solvent-based paints must be electrically isolated. Water-based paints are highly conductive.

[0009] Therefore, when using organic solvent-based paints, the direct charging method is fine, but when using water-based paints, In the case of paint, since the paint supply pipe 6 is grounded, it cannot be directly charged. It is preferable to use a head electrode method.

0010 When applying water-based paint using the grid electrode method, the grid electrode 11 and the grounded bell support 2. It is understood that measures must be taken.

[0011] However, in actual operation, water-based paints are limited to specific paint colors, etc. Most of the time, organic solvent-based paints are used, and organic solvent-based paints are In some cases, a direct charging method is used. For this reason, there are some deficiencies in the grid electrode method. Even if there was a problem, the installation locations and number of installations using water-based paint were limited. The reality is that its shortcomings have not been examined deeply and have been left alone.

0012 However, in recent years, demands for pollution prevention have become even stronger, and VOC regulations have become increasingly important. Due to this, the use of paints that use organic solvents such as thinners is becoming restricted. Water-based paints based on water are attracting attention, and the development of these paints is becoming more active. Therefore, in the near future, the ratio of organic solvent-based paints to water-based paints will be reversed. it is conceivable that.

[0013]

[Problem that the idea aims to solve]

In this way, water-based paints using the grid electrode method, which will become mainstream in the near future, will be used. A detailed study of the usage cases reveals that the above conventional structure has the following specific drawbacks. be.

[0014] In other words, in the conventional grid electrode device described above, the air around the device Water-based paint mist etc. floating on the outer peripheral surface of the grid electrode 11 (insulating cylindrical body 12) If it adheres, high voltage leaks will occur due to the moisture in the paint mist, and the operator may Electric shock may occur if you approach or touch it.

[0015] By the way, in order to reduce the size of rotary atomizing electrostatic coating machines, grids are used. As the distance between the electrode 11 and the bell support 2 tends to become narrower, the above-mentioned electric shock It is expected that the rate of accidents occurring will increase, and drastic solutions need to be taken. There is.

[0016] In view of the above circumstances, the purpose of this invention is to prevent the occurrence of leaks and to safely apply water-based paints. To provide a grid electrode device for a rotary atomizing electrostatic coating machine that can be equipped with be.

[0017]

[Means to solve the problem]

The device is arranged around a bell that rotates in a predetermined direction to atomize the paint. It has a predetermined number of rod-shaped grid electrodes, and atomized paint is applied to the tips of the grid electrodes. Grid electrode device for a rotary atomizing electrostatic atomizer equipped with a discharge section for charging A predetermined number of grid electrodes are provided so as to surround the outer peripheral surface of the base end of the grid electrode. an air outlet and an air supply means for supplying air to the air outlet. and blows air from the air outlet by driving the air supply means. The grid electrode is characterized in that it is configured to blow out from the base end toward the distal end. be a sign.

[0018]

[Effect]

In this invention, air is supplied from the air outlet by driving the air supply means. is blown out from the proximal end of the grid electrode toward the distal end.

[0019] This allows water-based paint mist floating in the air to be removed from the grid electricity during painting operations. Even if you approach the outer circumferential surface of the pole, it will be blown away by the blown air and touch the outer circumferential surface. Adhesion is effectively prevented. In addition, even if the outer circumferential surface of the grid electrode is coated with water-based Even if the material mist adheres to the surface, the air immediately evaporates the moisture.

[0020] Also, when the painting operation is stopped, etc., the surface temperature of the outer circumferential surface of the grid electrode may drop below the dew point. Air can be blown out from the air outlet even if water droplets form on the outer peripheral surface. The water droplets can be evaporated immediately.

[0021] This prevents moisture from adhering to and remaining on the outer peripheral surface of the grid electrode. Therefore, leakage can be prevented and water-based paint can be applied safely.

[0022]

【Example】

FIG. 1 is a sectional view showing essential parts of an embodiment of the present invention. Also, Figure 2 shows the grid FIG. 3 is a diagram for explaining the positional relationship between a single electrode and an air outlet. Furthermore, Figure 3 FIG. 2 is a diagram showing the overall schematic configuration.

[0023] An embodiment of the present invention will be described based on FIGS. 1 to 3.

[0024] The grid electrode device 1 according to this embodiment includes a grid electrode 11, a cylindrical body 19, and It also includes an air outlet 21 and an air supply means (31), which are the characteristic parts of this device. is configured.

[0025] In addition, the same reference numerals are given to the same components as those shown in Figures 4 to 6. , omit or simplify the explanation.

[0026] Here, the air outlet 21 connects the outer peripheral surface of the base end 16 of the grid electrode 11. A predetermined number (eight in this embodiment) are provided so as to surround each other. This air outlet 2 1, air flows from the base end 16 to the tip end 15 of the insulating cylinder 12 of the grid electrode 11. It is designed to blow out towards the target. This air outlet 21 has an air passage 2 Air supply means (31) is connected via 5 or the like.

[0027] In this example, the air supply means quickly evaporates moisture etc. from the water-based paint. It is formed by a hot air supply source 31 that supplies hot air to the air outlet 21 in order to .

[0028] Here, the hot air supply source 31 is a heater, a fan (both not shown), etc. It is composed of Note that warm air is a temperature lower than the indoor temperature (e.g. 30°C to 8°C). It means air whose temperature is higher by 0℃). Setting the temperature of hot air like this grid electricity without impairing the functionality of the piping system, etc. that supplies the hot air. It is possible to effectively prevent water-based paint from adhering to or remaining on the pole 11.

[0029] By driving the hot air supply source 31, hot air is generated from the air outlet 21. is blown out from the base end 16 of the insulating cylinder 12 of the grid electrode 11 toward the tip end 15. be done.

[0030] Next, the effect will be explained.

[0031] By driving the hot air supply source 31, hot air is generated from each air outlet 21. The air is blown out from the base end 16 of the insulating cylindrical body 12 of the double electrode 11 toward the distal end 15 . This allows water-based paint mist floating in the air to be removed from the grid electricity during painting operations. Even if you approach the outer circumferential surface of pole 11, it will be blown away by the hot air and the outer circumferential surface will be damaged. is effectively prevented from adhering to the surface. Moreover, even if the outer peripheral surface of the grid electrode 11 Even if water-based paint mist adheres to the surface, the warm air immediately evaporates the moisture.

[0032] In addition, when the painting work is stopped, etc., the surface temperature of the outer peripheral surface of the grid electrode 11 is below the dew point. Therefore, even if there are water droplets on the outer peripheral surface, the air outlet should be closed before starting the painting process. By blowing hot air from 21, the water droplets can be immediately evaporated. This prevents moisture from adhering to or remaining on the outer peripheral surface of the grid electrode 11. As a result, leakage can be prevented and water-based paints can be applied safely.

[0033] Therefore, in this embodiment, the outer peripheral surface of the base end 16 of the grid electrode 11 is surrounded. A predetermined number of air outlets 21 are provided so as to (warm air); By driving the air outlet 21, air (warm air) is supplied to the grid electrode 11. Since the electrode 1 is configured to blow out from the base end 16 toward the distal end 15, the electrode 1 It is possible to prevent moisture from adhering to and remaining on 1. This prevents leaks from occurring. It is possible to safely apply water-based paints by preventing stains.

[0034] In particular, in this embodiment, since the configuration is such that warm air is blown out from the air outlet 21, More effectively prevents moisture from adhering to and remaining on the grid electrode 11, making it possible to use water-based paints. can be safely painted.

[0035] In the above embodiment, the configuration is such that hot air is blown out from the air outlet 21. However, a configuration may also be adopted in which air that is not particularly heated is blown out.

[0036] In addition, although the air supply means was formed from the hot air supply source 31, the air supply means was formed from the hot air supply source 31; Any configuration may be used as long as air can be supplied.

[0037]

[Effect of the idea]

According to the present invention, a predetermined number of grid electrodes are installed so as to surround the outer peripheral surface of the base end of the grid electrode. a closed air outlet and an air supply means for supplying air to the air outlet; The air is supplied from the air outlet by driving the air supply means. Since the airflow is configured to blow from the base end of the head electrode toward the tip end, the It can prevent moisture from adhering and remaining. This prevents leaks from occurring. water-based paint can be applied safely.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing essential parts of an embodiment of the present invention.

FIG. 2 is a diagram for explaining the positional relationship between a grid electrode and an air outlet in one embodiment.

FIG. 3 is a diagram showing the overall configuration of one embodiment.

FIG. 4 is a diagram showing a rotary atomizing electrostatic coating machine equipped with a conventional grid electrode device.

FIG. 5 is a diagram showing a grid electrode of a conventional grid electrode device.

FIG. 6 is a diagram showing the internal configuration of a conventional rotary atomizing electrostatic coating machine.

[Explanation of symbols]

1 Grid electrode device 3 bell 11 Grid electrode 21 Air outlet 31 Hot air supply source (air supply means)

Claims (1)

[Scope of utility model registration request] [Claim 1] A predetermined number of rod-shaped grid electrodes arranged to surround a bell that rotates in a predetermined direction to atomize the paint, and for charging the atomized paint at the tip of the grid electrode. In a grid electrode device for a rotary atomizing electrostatic coating machine, which is provided with a discharge section, a predetermined number of air outlets are provided so as to surround the outer peripheral surface of the base end of the grid electrode, and the air outlet includes: and an air supply means for supplying air, and is configured such that air is blown out from the air outlet from the base end toward the distal end of the grid electrode by driving the air supply means. Grid electrode device for rotary atomizing electrostatic atomizer.