TW200414933A - Electrostatic coating method by external electrification and apparatus for the same - Google Patents

Abstract

In electrostatic coating, external electrification has to be improved, in which a high voltage may lead to a danger. The problem in miniaturization prevents conveniently and safely performing electrostatic coating on external electrodes. Painting efficiency is enhanced while improving the environment by applying external-charging-system electrostatic painting immediately to various spray units, thereby spreading electrostatic painting of water-based paint, or the like. Therefore, in the external-charging-system electrostatic painting where paint sprayed from the spray unit is charged by an external charge electrode provided separate from the passage of paint, a high voltage charger including the external charge electrode and the spray unit are manufactured separately and fixed when electrostatic painting is performed. Operation of the high voltage charger is interlocked with the operation of the spray unit and electrostatic painting is performed utilizing external charging. The high voltage charger is provided integrally as an external charging unit comprising a high voltage generator, a high resistor for limiting over current flow to the external charge electrode, and the external charge electrode so that electrostatic painting is performed by external charging system while facilitating combinations with various spray units. Accordingly, it is able to spread electrostatic painting of water-based paint or the like, and further spray drug liquid, processing agent or the like in addition to the field of coating.

Description

发明 Description of the invention: [Technical field to which the invention belongs] Field of the invention The present invention relates to a type of coating which is particularly excellent in the case of electrostatic coating using a highly conductive coating such as a water-based coating or a metal-based coating. Appropriate painting efficiency 'safety and electrostatic coating side 2 as the static electricity of its device "use spray gun, in detail, it is related to a kind of The external electrode applies a high voltage to the ground potential side of the object to be coated and discharges to form an electric field. The electrostatic charging method and electrostatic spraying method of the external charging method in which the paint particles passing through the discharge area are charged. [Background of the Invention] Electrostatic coating is a widely used coating method in which spray paint particles are charged with high-voltage static electricity and formed by a spray gun on the object's electric field to improve coating: effectiveness. In addition, the coatings used in the above-mentioned electrostatic coatings are roughly divided into high-conductivity coatings such as water-soluble or metal-based coatings with high electrical resistance values and water-based or metal-based coatings with low electrical resistance values depending on the relationship between the effects. The installations are also very different. In addition, solvent-based paints containing volatile organic compounds have been required to be reduced in use due to environmental problems in recent years, and therefore must be transferred to water-based paints. However, in the case where the spray coating is directly charged to improve the electrostatic coating effect, when using a water-based coating, in a general device, a high voltage that is charged by an object can flow through the coating to a grounded coating supply source. The electrostatic effect is obtained, and there is a danger that a high voltage flows to the paint supply system. For this reason, there have been used methods and apparatuses for insulating the above-mentioned paint supply system from the ground side and maintaining a high voltage for painting. However, since the charge amount of the paint supply system is increased, the danger cannot be avoided. In addition, in order to continuously perform coating operations to improve industrial efficiency, it is necessary to use a paint supply device as shown in Japanese Laid-Open Publication No. 6-198117. Since a large f unit must be introduced, it is also necessary to use and save it. problem. Because of these problems, #electric coating technology such as water-based paints and metallic paints cannot be universally applied, and this is the reason why there are no environmental countermeasures. • In electrostatic coating, in addition to the method of charging the paint directly, in addition to the method of directly charging the paint, there are known methods in which the paint particles are discharged from an electrode provided outside the area by not directly charging the paint. An electrostatic coating device that is electrically charged through the ion ^ region and then faces the power line (electric field) of the object to be coated with an external electrode applied to the external electrode of the object to be coated. The device has an electrostatic device of Japanese Patent No. 2770079 and Japanese Patent Publication No. 7-213958. Among them, the externally-charged electrostatic coating device applies a high voltage to an external electrode provided at a position away from the spray coating area of the spray gun, thereby discharging on the ground potential side such as the object to be coated, forming an electric field, and making The paint particles passing through the discharge domain are charged and the electric field is formed toward the object to be coated to promote coating. However, compared with the aforementioned direct charging method, the effect of charging the paint particles passing through the discharge domain is lower, and a sufficient electrostatic effect cannot be obtained. Generally, commercially available electrostatic painting spray guns can be obtained. In the case of direct charging methods mainly used in solvent coatings, the 200414933 charging voltage of the electrode ranges from -30kV to -7kV, and can be obtained. The potential difference is quite effective, but because the high voltage will increase the risk of spark discharge and electric shock discharge, and the withstand voltage strength of Hai Yi Zhi, and other factors, it is necessary to reduce the charged voltage as much as possible. Therefore, most of the charged voltage of the electrode is about _50kv. On the other hand, the electric method of 5 °° 卩 1 is generally based on the difference of 咼 potential and the charging voltage is -70kV to -90kV. And it is the same as the direct W electric method of the charging efficiency car with the charging electrode directly set in the paint spray center. Compared with the external charging method, in order to obtain practical effects, a higher voltage is required, and the position of the charged electrode is set in front of the 10 spraying device to prevent the spray paint from being sprayed to the grounding potential spray side. Dangerous discharges and voltage drops on live electrodes due to discharges. In general, the commercially available spray-and-grab structure has a charged electrode located 80111111 to 150 mm in front of the uranium spray port and protrudes in front of the spray chemical device 15. Therefore, most of them are used by being automatically sprayed and driven by an automatic coating equipment. In other words, in the portable spray gun, the charged electrode system magic land protrudes forward, and in order to prevent the spray coating from adhering to reduce its function, the charged electrode will be placed on the side, avoiding the central axis of the spray, which becomes large and difficult to operate Spray robbing increases the burden on the operator. 20 Also, spray guns for portable electrostatic coatings can be found in Japanese Patent Laid-Open Publication No. 53-30646, but the electrodes protruding from the front end will destroy the operability, and there is a danger of being damaged by hitting the article during the work, etc. Many problems hinder popularization. In addition, compared with the method in which the paint is directly charged, when the electrode is charged by discharging from an external electrode, the charged amount is greatly different. Therefore, it is necessary to use a 7 S tortoise c and consider the voltage. & The cost of use requires an effective electrostatic coating method or device by a commercially available externally charged method. As described above, the external f-electric method cannot be fully charged and strengthened, and there are concerns about the danger of using higher voltages. It is necessary to make the spray gun small: reduce the size and improve the use problems, and it is impossible to use external electrodes. It is practical, light, and safe to use when competing for electricity. ♦. In addition, the fundamental problem to be solved by the present invention is to improve the operability of spray guns for electrostatic coating with externally charged electrodes, and to ensure safety to protect the operation. Furthermore, considering popular methods, expanding the use in various situations In order to popularize electrostatic coating such as water-based coatings. In the present invention, the electrostatic coating can be easily found by externally charged electrostatic coating, and the need for money can be increased by using it lighter. At the same time, the use of environmentally-friendly volatile organic compounds in solvent-based coatings has been replaced by water-based coatings, which can reduce the use of coatings due to the improvement in the efficiency of electrostatic coatings. Therefore, the present invention is to provide a method and an apparatus for fully implementing the effects of electrostatic coating by an external charging method. The devices that have been seen so far are integrated with the spray gun to become a special device with a charging device and a spray device, and the required number must be prepared in groups. t Summary of the Invention 3 Summary of the Invention The present invention is formed by charging the paint sprayed from the spraying device by an external electrode separated from the paint passage and provided on the outside of the spraying device 200414933. The electric field is applied in addition to painting. In the case of electrostatic painting, a high-voltage charging device and an atomizing device including an external electrode are prepared separately, and the scale devices are assembled with each other on the electrostatic painting day. , The aforementioned high-voltage charging device is operated in conjunction with the operation of the above-mentioned == clothes, and the charging section is charged for electrostatic coating.

In industrial applications that require productive factory painting, several spraying devices are often prepared, used separately, and used as preparations in case of failure. For the purpose of this spraying device, there are various methods, and a suitable spraying device is used for the coating material and the coating product f, the shape and quality of the coating object during coating. In this case, the high-voltage charged device including the aforementioned external charged electrode for improving the electrostatic coating efficiency can be applied to a common device without requiring a corresponding corresponding device. t "According to the above method, a high-voltage charging device with a minimum of external charged electrodes can be applied to most spraying devices, and can reduce installation costs and maintenance times. In addition, when the spraying device is portable In this mode, the atomization device and the high-voltage charging are simultaneously controlled by the trigger operation linkage control to ensure the interoperability and safety. Also, the spraying device and the high-voltage charging can be controlled by an external signal. The externally-charged electrostatic coating device of the present invention includes a spraying device; a high-voltage generating device; and an externally charged electrode, and the externally charged electrode is separated from the paint path supplied to the spraying device and is provided in the mouth mist. The high-voltage generator from the high-voltage generator is equipped with a high-voltage generator 9 200414933, which is characterized in that the externally-charged electrostatic painting spray gun is integrally provided with a high-voltage generator to limit the maximum current flow to the external High impedance of the electrode, and an externally charged unit including the foregoing externally charged electrode, and the unit can be used on the aforementioned spraying device It can be installed and unloaded from the ground. 5 Therefore, when the external electrification method is applied, it can be used as a static electricity by forming a unit with the required electrical structure and combining the unit with the desired spray device. The coating device is used. Preferably, the externally charged electrodes can be attached to and detached from the externally charged unit, so that it is easy to exchange only the electrodes, and can also respond to changes in electrode positions. 10 Moreover, a plurality of externally charged electrodes can be provided as required. The electrode is used to expand the corresponding range. The spraying device is provided with a power supply terminal, and when the external charging unit is installed, it can be connected to the input terminal of the high voltage generator, and the operation on the side of the spraying device is used. It can be switched on and off at high voltage of 15. Also, the loading and unloading unit has a locking device installed in a single-touch manner, and is configured to release the locking device to be separated, and becomes a device that is extremely easy to use in practice. The atomizing device can be separated into an atomizing head which forms a paint passage and atomizes the paint by atomizing air, and forms air. There is a spray operation part for the valve for compressing the gas for supplying the aforementioned atomized air. Therefore, the electrostatic coating device of the present invention can be divided into a high-voltage charged part, an atomization head, and an atomization operation part. The three large basic units can respond to industrial units that require productive coating, and no matter which unit has a bad condition, 10 200414933 can quickly replace each unit to respond. Moreover, by using a spray device The chemical liquid sprayer can be used in fields such as chemical liquid spraying and treatment agent spraying that have been slow to be applied in the past, and can improve the coating efficiency using high-voltage electrostatic charging, and prevent 5 sprays. Other harmful features, scattering of toxic substances, etc. Other detailed features will be described in detail in the description of the embodiment described later. The drawings briefly explain the actual effect in order to better understand the present invention, and can refer to the display of the effective embodiment of the present invention 10 The following additional drawings. Fig. 1 is a sectional view showing an embodiment of the present invention. Figure 2 is an external view of the state where the spray gun body is separated from the external charging unit. Fig. 3 is an appearance view of a state where the spray gun body is combined with an external charging unit. FIG. 4 is an explanatory diagram showing the mounting positions of the external electrodes. 15 Figure 5 is a cross-sectional view of the external charging unit. Fig. 6 is a structural diagram of a high voltage generator. Fig. 7 is an external view showing a state in which an externally charged unit is separated from a spraying atomizing head and a spray operating unit into three units. L Embodiment 3 20 The best form for implementing the present invention. Figure 1 shows an example of an externally electrified portable electrostatic painting spray gun when the present invention is implemented. The spray gun 1 is operated with a handle 2 and a trigger 3. . A spray valve 5 for atomizing the sprayed paint, a device for regulating the flow rate of the paint, and the like, which are provided at the front end, are combined into the gun body 4. 11 200414933

In this embodiment, the spraying device 5 is sprayed with compressed air to spray paint, and an air hood 51 is arranged around the paint nozzle 52. The desired spray pattern is formed by the air hood 51 to be sprayed. Painting of paint. These structures adopt a well-known spray-and-grab structure, but for static electricity coating, the body-grabbing portion 4 is included, and the paint nozzle 52 and the air cover 51 are also made of electrically insulating materials. When using a water-based or highly conductive paint according to the present invention and a charge electrode is provided for external spraying, the paint path is connected to the ground potential. The needle valve 53 in the paint nozzle 52 is metal and is connected to the handle at the rear. 2Electrical connection. Like the general electrostatic spray gun 10, the 'handle 2 has conductivity, and in this embodiment, a semi-conductive tree is used, and it has a ground-side potential when the operator operates it by hand. The external charging unit 9 provided above the body grabbing unit 4 is combined with the krypton voltage generator 6 as shown in Fig. 5 and forms a separable structure from the spray gun body 1 including the aforementioned atomizing device 5. This external electrode unit 9 is formed by injecting a low-frequency transformer 61, Cockcrft_WaitOn multi-stage voltage doubler rectifier circuit 62, and a protective high impedance 63 as shown in FIG. 6I5 with an insulating resin.

The high-voltage generator 6 constructed with the E64 structure and the external electrode 7 are combined into a unit envelope 68 formed of an insulating material. The aforementioned bullet IE64 exposes the input terminal ^ on the low voltage supply side and the output terminal 66 on the high 20 voltage output side, while maintaining the electrical insulation strength of the other parts. When M is connected to the unit envelope 68, the Lead η is connected. In addition, the unit cover 68 is provided with an electrode connection portion 13 of an externally charged electrode at the other end, and the other end of the hemi wire 12 serves as a connection end, and is exposed inside the electrode connection portion 13 of an insulating material. The electrode connecting portion 13 is connected to the spraying main body 1 with 12 10 20 externally charged units 9 arranged at the rear of the spraying device 5 and outside the grabbing portion 4 as shown in Figs. 2 to 4. ^ Electrical charges are charged outside the electrode connection portion 13 and exposed at the front end. An electrical connection is provided at the rear end and the entire connection terminal 73 is exposed from the end of the installation and removal portion 72, and the conductor is exposed by a conductor. The connection terminal 73 is connected to the front electrode 71. The externally charged electrode is 7A = early = the electrode connection part of the envelope 68 is called, and the connection terminal is externally connected. The connection terminal installed by the electric early_contact is electrically connected. In this embodiment, in order to make the connection surely, the connection terminal 73 on the external electrode 7 side is cut to form a body grabbing portion 4_ The connection terminal 14 can also be formed by turning. The externally charged electrode 7 is as shown in a part of FIG. 4. The electrode 13 is inserted into the electrode connector, and the portion 13 ′ can be fixed only by rotating the locking piece to the locking groove μ, and can be configured as a necessary front end. Externally charged electrode 7 at the electrode position. The locking method is not limited to this example. Generally, the locking device that is used is simply inserted into the sub-sperm and the dimensional accuracy is closely adhered to the friction force to obtain the necessary fixing force.

The method can be selected or it can be selected to be locked by engaging the deformed locking piece with the groove. The 77k can be removed, and the method can be used to open and separate the locking #.

There is no particular limitation on the device for combining the external dynamo electric element 1 and 9 into the spray grab main body 1. A general-purpose fixing device can be used, but it cannot be expected to be easily attached and detached. Here, a concave portion is formed in front of the gun body portion 4 on the side of the body of the grabbing body, and a locking piece for locking in the concave portion is formed on the side of the 邛 τ (γ 黾 unit 9), and then the grabbing portion is clamped. Both sides of 4 are embedded into the rear end of the spray gun, and are kept fixed. The resin of the unit cover 68 is elastically deformed to be easily removable by hand, but in order to eliminate the danger of separation during use, 13 fixing screws of other fixing devices can be used. The power supplied to the external charging unit 9 and the high voltage generator 6 is connected to the power supply of the spray gun through the switch that can be turned on and off according to the operation of the board machine. When the external charging unit 9 is combined, it is positioned to connect the output terminal (not shown) on the side of the spray gun body 1 to the input terminal 6 $ 3 'of the aforementioned magazine 64 and constitute an electrically conductive structure. Therefore, it is easy to connect the lines. Among them, the contact points are known connection methods such as slide-in type and push-type type. When electrostatic coating of 10 fields and other devices, 9 groups of external charging units are dreamed of spraying and shrinking. Carcass 1 and for The predetermined power supply, paint, and spray are connected with χ gas to make a predetermined connection. If the trigger 3 is pulled down to operate the spray gun body, it will be sent to the power supply of the paint spray and external charging unit 9 to high static electricity. The charged electrode is charged by the high voltage 15 emitted by the front-end electrode 71. The sprayed paint particles are charged and coated on the other electrode to perform electrostatic coating. The 20-pole 7 is made of an external charging unit. The 9 series is composed of the generation of high power and externally charged electricity, so it can be manufactured separately and relied on. Therefore, even if it is stopped as usual, it must be replaced. Only the part can be replaced, and the paint supply path is included. It can be sprayed to grab the body. It can be separated from the center of the figure due to the formation of the inclining device 5 of the tilting body 1 to form a paint passage and to atomize the air to chemically charge 50. Gas passage and built-in for the recognition of 铪, +, _ for shrinking air, ㈣ ，, atomizing air clothes can be divided into _ ^ k electrostatic coating] into the secret π electric department 90, fog 3 basic orders for head 50, mouth spray 14 200414933 In this way, when industrially required productive workshop painting, no matter which unit has a defective condition, each unit can be replaced to respond quickly. In addition, when producing the product of the present invention, due to the aforementioned three basic Units can be produced separately. Therefore, according to the customer's 5 quality requirements, units with different specifications can be made separately, and in the combination stage, they can be assembled according to the purpose to expand their use. 10 15 20 丁 only-a ,,, , Bu Ding, drink ΓΠ 米 um 总 T overall shape, ^ said do not specifically charge the spray coating, the role of electrostatic field to improve the effectiveness of the coating method, in this regard, for example, even if used in airless Spraying and spraying by air spraying method can also improve the same effect. Moreover, instead of using a hand-held spray gun, it can also be used to automatically control the action of spraying and spraying. ^ Furthermore, the present invention uses spraying from the outside. The device sprays life, micro-particles V, and enters the quilt and coating on the grounding side. 'Thus, you can use a medicinal liquid sprayer in the spray booth, and y' an external charging order. ♦ At this time, No 1 to the aforementioned medicinal solution雾 ir · Externally-charged unit integrated ground — — service is connected to the front ”The electric unit 9 is connected to the factory ^ In addition, the high voltage can be directly supplied to the outer V package. The voltage“ to the high-power fortress, and by external power + The liquid particles are charged to obtain an electrostatic charging effect. Yang's Chemicals As mentioned above, 'Using the present invention can facilitate the use of an external band = :: Γ_water-based paint and other highly conductive materials'Γ is conveniently used as a device suitable for electrostatic coating. 4, 2 'spray spraying device and the outhouse generator are included. Because it can be used according to the needs, it can be used efficiently. The high-voltage equipment with 5 poles can be efficiently used. Repair into

# 15 With only replacement I, it can be used for each of the comparative parts and * when applicable, the corresponding way \, "parts can be resolved, as a change in interrupted operations or failures, and also: the front electrode position is limited by individual spray It is necessary to do a few lines of exchange to make the electrode body be able to be loaded and unloaded from the external charging unit mentioned above, and to lift and lift the ut, and external electrostatic charging can be performed on a large scale. Promote the static 10 15 load, because it contains spoils, so it can reduce the use of solvent-based coatings that have volatile organic compounds in the environment 3. The charge of the single -2 & amp voltage is only safe when installed on the externally charged electrode part of the externally charged front end part. It is extremely safe and the electrostatic coating effect can be obtained in any Γ. Therefore, it can be easily used in spraying of chemical liquids other than the slow coating 1 and spraying agent such as spraying agent, and can improve the coating efficiency, and prevent the harmful and toxic substances in the spray industry. In the field of coating, solvent coatings with high electrical resistance values are mainly used. Due to environmental problems in recent years, it is necessary to replace solvent-based coatings containing volatile compounds such as phase compounds into water-based coatings. The present invention particularly provides an externally-charged electrostatic coating method and an externally-charged electrostatic coating skirt, which can solve the danger of using water-based coatings and metal-based coatings with low impedance values, and cannot be popularized due to the enlargement of the device. The current status can be confirmed ^ excellent workability, the most appropriate coating efficiency. This can contribute to the application and popularization of water-based coatings that can greatly improve environmental issues. In addition, by using a chemical liquid sprayer instead of a spraying device, it is possible to use a chemical liquid spray and a treatment agent instead of a coating material. [Brief Description of the Drawings] FIG. 1 is a sectional view showing an embodiment of the present invention. Figure 2 is an external view of the state where the spray grab main body is separated from the external charging unit. Fig. 3 is an appearance view of a state in which the spray grab main body is combined with an external charging unit. FIG. 4 is an explanatory diagram showing the mounting positions of the external electrodes. Figure 5 is a cross-sectional view of an external charging unit. 10

Fig. 6 is a structural diagram of a tritium voltage generator. Fig. 7 is an external view of a state in which an externally charged unit is separated from the atomizing head and the spray operating part of the spray gun into three units. Symbols of the main components of the drawing] 1 ... Spray 10 ... Spraying operation part U ... Lead 13 ... Electrode connection part 14'73 ... Connection terminal 15 ... Locking groove 16, 76 ... Ditch 2 ... Handle 3 ... Trigger 4 ... Body grab 5 ... Atomizing device 5G ... Atomizing head 51 ... Air cover 52 ... Paint nozzle 53 Needle valve 6 High voltage generator 61 Transformer 62 Rectifier circuit 63 South impedance for Baoda 64 Magazine 65 Low voltage input terminal 66 · High-voltage output terminal 68 ··· Unit cover 7 ··· External charged electrode 71 ··· Front electrode 72 ··· Removable section 74 ··· Conductor 75 ··· Locking piece 9 ··· External charged unit 90 ··· High voltage live

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Claims (1)

200414933 Scope of patent application: 1. An externally-charged electrostatic coating method is to charge the paint sprayed from the spray device by an external electrode that is separated from the paint path and is arranged outside the spray device. , And apply the electric field formed by the object to be painted to the external electrification method for electrostatic painting. Next, a high-voltage charging device and an atomizing device including an externally charged electrode are separately prepared, and these devices are assembled with each other during electrostatic coating, so that the operation of the high-voltage charging device and the atomizing device is interlocked. Acting as a method for electrostatic painting using external charging. 10 2. If the externally-charged electrostatic coating method according to item 1 of the scope of patent application, different spraying devices are selected according to the spraying characteristics, and the triggering operation of the spraying device is used to control the spraying device. The charged person of the aforementioned high voltage charged device. 3. For the externally-charged electrostatic coating method according to item 1 of the scope of patent application, the external spraying device and the high-voltage charging device are controlled by an external signal. By. 4. An externally charged electrostatic coating device comprising a spraying device; a high voltage generating device; and an externally charged electrode, and the externally charged electrode is separated from a paint passage supplied to the spraying device and is provided in the spray The outside of the device is provided with a high voltage from the aforementioned high-voltage generating device, and is characterized in that the aforementioned externally-charged electrostatic coating spray gun is integrally provided with a high-voltage generator to limit the maximum current to the external electrode. A high-impedance, external charging unit including the external charging electrode, and the unit can be freely mounted on the spraying device. 18 200414933 5. If the externally charged electrostatic coating device of item 4 of the scope of patent application, the aforementioned externally charged electrode can be attached to and detached from the aforementioned externally charged unit. 6. If the externally charged electrostatic coating device of item 4 of the scope of the patent application, wherein the aforementioned spraying device is provided with a power supply terminal, and when the aforementioned external charged electrode is installed, the aforementioned power supply terminal is connected to the aforementioned Input side of the high voltage generator of the external charging unit. 7. If the externally charged electrostatic coating device of item 4 of the patent application scope, wherein the aforementioned loading and unloading section has a locking device installed in a one-touch manner, and constitutes 10 as a person who can release the locking device for separation. 8. The externally-charged electrostatic coating device according to item 4 of the patent application, wherein the aforementioned spraying device has an atomizing head that forms a paint passage and atomizes the paint by atomizing air, and forms a gas passage and internally A spray operation part is provided for the compressed air valve for supplying the aforementioned atomizing air, and the spray 15 atomization head can be separated from the spray operation part. 9. The externally charged electrostatic coating device according to item 4 of the patent application, wherein the aforementioned spraying device is a chemical liquid sprayer. 19