CN100574894C - Electrostatic coating spray gun - Google Patents
Electrostatic coating spray gun Download PDFInfo
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- CN100574894C CN100574894C CN200480008199A CN200480008199A CN100574894C CN 100574894 C CN100574894 C CN 100574894C CN 200480008199 A CN200480008199 A CN 200480008199A CN 200480008199 A CN200480008199 A CN 200480008199A CN 100574894 C CN100574894 C CN 100574894C
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- 238000007590 electrostatic spraying Methods 0.000 abstract description 29
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- Electrostatic Spraying Apparatus (AREA)
Abstract
A kind of spray gun that is suitable for using the electrostatic spraying of the less coating of resistance.The front end central portion that has the bobbin (2) of forwards outstanding cylindrical portion (36) in the front end outer peripheral edges is installed with paint spray nozzle (24), is provided with its airhood that covers previously (40).Between the outer peripheral face of airhood and paint spray nozzle, cylindrical portion inner peripheral surface, form figure air flow circuit (45), ring electrode (13) is installed in its stream.Central portion at airhood is provided with atomizing air squit hole (32), can insert the coating discharge opening (30) of logical paint spray nozzle leading section.Pin shape electrode (31) break-through coating discharge opening is forwards outstanding.1 across corner (39) is forwards outstanding from the both ends, the left and right sides of airhood, and figure air squit hole (38) is set in this bight, with pin shape electrode grounding, to the additional dc high voltage of ring electrode.
Description
Technical field
The present invention relates to electrostatic coating spray gun, particularly relate to the electrostatic coating spray gun of the aqueous coating that is suitable for using resistance less, electrostatic spraying that metal is coating.
Background technology
In general, in the coating that the electrostatic spraying of car body etc. is used, can be divided into the higher solvent of resistance and be the less aqueous coating (water paint) of coating (oil paint), resistance and be dispersed in metal dust with the metal in coating is coating.Wherein, using less aqueous coating, the metal of resistance is the occasion that coating carries out electrostatic spraying, if directly high voltage is additional to the charge electrodes of the electrostatic spraying gun body that contacts with these coating, electric current can flow to ground connection by coating feed path, coating case.Like this, because of not causing discharge between charge electrodes and coated article, so the coating particle that is atomized can not be charged.
As the conventional art that addresses this problem, a kind of method that coating case and ground connection are carried out the insulation of electric property is for example arranged.Adopt this method, because of high voltage being additional between the charge electrodes and coated article of electrostatic spraying gun body, so can make coating particle charged.But it is, very inconvenient because need a kind of special coating supplementary device that makes when replenishing coating the coating operation interrupt or keep replenishing under the state with the insulation of the electric property of coating case (for example, with reference to patent documentation 1) to the additional high voltage of coating case.
As another solution, have a kind ofly 1 and even a plurality of outer electrode to be set on the radial outside position of electrostatic spraying gun body and, to be called as the outer electrode mode to its additional high-tension mode.This mode can be divided into: use the mode (for example, with reference to patent documentation 2) of swinging atomising head in the coating atomizing in the electrostatic spraying gun body and use compressed-air actuated pneumatic spray regime (for example, with reference to patent documentation 3).Dual mode is not that the coating that additional high-tension outer electrode and resistance is low contacts, so can make coating particle charged under the state of coating case ground connection.Thereby, do not need to be provided with and replenish the special device that coating is used to coating case, can carry out continuous coating.
Yet, when adopting the outer electrode mode, except the electrostatic spraying gun body, also outer electrode to be installed, electrostatic spraying gun is maximized, and, there is high-tension electrode to be present in body exterior because of additional, so very dangerous.Again, also existing the coating particle that is atomized is attached near the outer electrode because of electrostatic force or the problem around the electrostatic spraying gun body.
[patent documentation 1] Japan Patent spy opens the 2002-143730 communique
[patent documentation 2] Japanese patent laid-open 06-134353 communique
[patent documentation 3] Japanese patent laid-open 09-136047 communique
Summary of the invention
The present invention makes under above-mentioned background, its purpose is, provide the aqueous coating that is suitable for using resistance less, electrostatic spraying that metal is coating pneumatic spray regime electrostatic spraying gun promptly, coating case ground connection is sprayed and the compactly designed electrostatic coating spray gun of electrode is not set in body exterior.
Purpose of the present invention realizes by the electrostatic coating spray gun that following feature is provided, promptly, a kind of high voltage that uses makes compressed air-atomized coating electrified, the electrostatic coating spray gun that sprays on coated article, comprising: the bobbin 2 that on the outer peripheral edges of leading section, is formed with forwards outstanding cylindrical portion 36; Leading section, its inside that is installed on this bobbin 2 has flow path of being coated with 29 and atomizing air stream 33 and has the paint spray nozzle made of insulating material 24 of coating discharge opening 30 at front end; The airhood 40 that the front end face of this paint spray nozzle 24 and described bobbin 2 is covered, this airhood 40 is the outer peripheral face of face and described paint spray nozzle 24 within it, form space between the inner peripheral surface of described cylindrical portion 36 as figure air flow circuit 45, this airhood is equipped with at central portion to be inserted logical for described coating discharge opening 30, and be communicated with described atomizing air stream 33, can spray compressed-air actuated atomizing air squit hole 32, around this atomizing air squit hole 32, be equipped with equally and be communicated with described atomizing air stream 33, can spray compressed-air actuated a plurality of assistant figure air squit hole 38a, this airhood has outstanding from both ends, the front end left and right sides, be equipped with and be communicated with 1 across corner 39 that can spray compressed-air actuated figure air squit hole 38 with described figure air flow circuit 45 to oblique inboard the place ahead; From the forwards outstanding pin shape electrode 31 of described coating discharge opening 30; In the space that becomes described figure air flow circuit 45, form the electrode 13 that ring-type surrounds described paint spray nozzle 24, with described pin shape electrode 31 ground connection, additional dc high voltage between this pin shape electrode 31 and described electrode 13.
This occasion, preferably with the vertical direction of the line that is connected described 1 across corner 39 on, at 2 positions leaving about 1/2 radius of this airhood 40 from the center on described airhood 40 surfaces, setting runs through the surface and the floating electrode between the back side (floating I electrode) 50 of this airhood 40, and described electrode 13 is formed semi-annular shapes, be mounted to distance between side's electrode tip of the end that makes this electrode 13 and described floating electrode 50 and equal distance between the opposing party's electrode tip of the other end of this electrode 13 and described floating electrode 50.
Adopt the electrostatic coating spray gun of structure like this, can use the less aqueous coating of resistance, metal is the electrostatic spraying of coating.Because of electrode 13 being accommodated in the inside of spray gun, can make the spray gun miniaturization so compare with outer electrode again.And, because of adding the inside that high-tension electrode 13 is accommodated in spray gun, so can obtain to improve the effect of security.
Again, when using interpolation to be provided with the electrostatic coating spray gun of described floating electrode 50 structures, between floating electrode 50 and pin shape electrode 31, produce discharge along airhood surface, can obtain to reduce the effect of the amount of the coating particle that is attached to the airhood surface thus.
Another purpose of the present invention realizes by the electrostatic coating spray gun that following feature is provided, promptly, a kind of use high voltage makes compressed air-atomized coating electrified, the electrostatic coating spray gun that on coated article, sprays, with 31 break-through of pin shape electrode be installed on this electrostatic coating spray gun 1 as the front face of the bobbin 2 of body from the central portion of airhood 40 to the coating discharge opening 30 of outside opening and forwards outstanding, on radially upper-lower position with the described airhood 40 of these pin shape electrode 31 clampings, be formed with the bight 40d more outstanding than described coating discharge opening 30,40e, at this bight 40d, the insulation jacketed electrode 13a by the insulating material covering surfaces is taken in the inside of 40e, 13b, with described pin shape electrode 31 ground connection, to ground connection and described insulation jacketed electrode 13a, additional dc high voltage between the 13b.
Adopt the electrostatic coating spray gun of structure like this, because of the additional high-tension electrode surface of direct current is covered by insulating material, so electric current does not flow between insulation jacketed electrode 13a, 13b and pin shape electrode 31.Like this, can under the narrower state in insulation jacketed electrode 13a, 13b and the interval of pin shape electrode 31, add high voltage.Can near pin shape electrode 31, particularly produce highfield near its front end thus, can make to be atomized the charged opposite polarity polarity that becomes and insulate jacketed electrode 13a, 13b of air-atomized coating particle.Charged coating particle along with the conveyance of figure air near coated article, utilize electrostatic force to be sprayed on the coated article.When using this electrostatic coating spray gun under this effect, not only solvent is a coating, and can carry out the less aqueous coating of resistance, metal is the electrostatic spraying of coating.Again, because of not needing the such outer electrode of conventional art, so can form compact spray gun.
Description of drawings
Fig. 1 is the longitudinal section of the spray gun leading section of the 1st embodiment.
Fig. 2 is the longitudinal section of spray gun of the present invention.
Fig. 3 is the front view of front end air cover of the spray gun of the 1st embodiment.
Fig. 4 is the front view that the front end air cover of spray gun is taken off the fore-end of state of the 1st embodiment.
Fig. 5 produces the structure example in loop for high voltage.
Fig. 6 is the longitudinal section of the spray gun leading section of the 2nd embodiment.
Fig. 7 is the front view of front end air cover of the spray gun of the 2nd embodiment.
Fig. 8 is the front view that the front end air cover of spray gun is taken off the fore-end of state of the 2nd embodiment.
Fig. 9 is the stereogram of position relation of each electrode of the spray gun of the 2nd embodiment.
Figure 10 is another stereogram of position relation of each electrode of the spray gun of the 2nd embodiment.
Figure 11 is the longitudinal section of the spray gun leading section of the 3rd embodiment.
Figure 12 is the longitudinal section of the spray gun fore-end of the 4th embodiment.
Figure 13 is the front view of front end air cover of the spray gun of the 4th embodiment.
Figure 14 is the electrical system of the spray gun of explanation the 4th embodiment and the ideograph of effect.
Figure 15 is the front view of front end air cover of the variant embodiment of spray gun of the present invention.
Figure 16 is the front view of front end air cover of another variant embodiment of spray gun of the present invention.
The specific embodiment
In order to describe the present invention more in detail, describe with reference to accompanying drawing.
(the 1st embodiment)
The 1st embodiment of electrostatic coating spray gun of the present invention (being designated hereinafter simply as spray gun) is described below with reference to Fig. 1～Fig. 5.The spray gun of present embodiment is to be that coating is its purpose with main use resistance less aqueous coating or metal as coating.Fig. 2 represents the longitudinal section of spray gun 1 unitary construction of present embodiment, Fig. 1 represents the longitudinal section of its fore-end, Fig. 3 represents the front view of front end air cover 40 described later, Fig. 4 represents this airhood 40 is taken off the front view of fore-end of the spray gun 1 of state, and Fig. 5 represents to produce high-tension loop example.
This spray gun 1 as shown in Figure 2, by as the bobbin (body of a gun) 2 of gun body be located at thereafter that the handle 3 of end constitutes.Bobbin 2 is made of the synthetic resin material of insulating properties, and integral body becomes cylindric.This spray gun 1 is the spray gun that a kind of high voltage produces the loop built in type, and the top in bobbin 2 is taken in and will be produced the integrally molded long grid (カ ス ケ-De) 4 of fore-and-aft direction in required step-up transformer of high voltage and high voltage rectifier loop.
As shown in Figure 5, the required high voltage of electrostatic spraying is produced by control loop 51 and high voltage generation loop 55.Control loop 51 is set near the not shown coating case, has high frequency electric source loop 52 and output transformer 53.When source power supply is supplied with in high frequency electric source loop 52, at the primary side generation high frequency voltage of the output transformer 53 that is connected with its outlet side.The high frequency voltage that is produced is located at the primary side supply that the high voltage in the grid 4 produces the step-up transformer 56 in the loop 55 by feed cable 54 in spray gun 1.The high frequency voltage that boosted transformer 56 boosts produces the dc high voltage of 30,000～60,000 V through extraordinarily voltage commutation loop 57 rectifications of Cockcroft, John Douglas Te-Wa Erdun type.In addition, the high-tension polarity that is produced can become just (+) or negative (-) with respect to earthing potential by changing the extraordinarily direction of the diode in the voltage commutation loop 57 of Cockcroft, John Douglas Te-Wa Erdun type.
The dc high voltage that is produced, from the lead-out terminal 6 of grid 4 front ends spring 7 by the electric conductivity that is in contact with it, the rear end side of the columned conductive contact 8 that guiding and the hole that is arranged in this anterior bobbin 2 screw togather is taken out by another electric conductivity spring 9 from the front of contact 8 again.In the front of spring 9, the cylindric resistance that screws togather with the hole that wears from the front end face of bobbin 2 is installed keeps body 10.The leading section of spring 9 is inserted in and is arranged in the distolateral thereafter hole, to inserting the high resistance body 11 end application of force inwardly in this hole, the rear end terminal of the high resistance body 11 that simultaneously high voltage led.The front end terminal of high resistance body 11 connects resistance maintenance body 10 from the inner end portion in hole, contacts with the rear end face of the stub of giving prominence to slightly from the front end face of resistance maintenance body 10 12.At the leading section of outstanding stub 12, by welding etc. affixed electrode 13 described later.Like this, the high voltage that is produced is supplied with to electrode 13 by the high resistance body 11 of electric current restriction usefulness.
Coating, is supplied with to the coating coupling nipple 15 that is installed on handle 3 bottoms by coating flexible pipe (not shown) from coating case (not shown), again from its valve chamber 21 by coating pipe 16 guiding paint valves 20.Paint valve 20 is set in the guide hole 18, and this guide hole 18 wears to rear end side in bobbin 2 from the inner end central portion of the recess 17 of the front end central portion of being located at bobbin 2 and forms.
Leading section at bobbin 2, be formed with the rounded installation recess 17 of section of form is cut in its front end face central authorities, install on the interior week of recess 17 at this, the paint spray nozzle 24 that is made of insulating properties synthetic resin material screws togather with end thereafter, fixes from the forwards outstanding form of recess 17 is installed with leading section.
Run through the centre bore between the rear and front end face of paint spray nozzle 24, be communicated with described valve port 25 as being coated with flow path 29.The front end of paint spray nozzle 24 is, forms the little excrescence of diameter with the contacted part of the front end that is coated with flow path 29, inserts in the atomizing air squit hole 32 that leads at airhood 40 described later with the state to outside opening as coating discharge opening 30.Coating from paint valve 20 is supplied with forwards spues from coating discharge opening 30 by being coated with flow path 29.
In coating discharge opening 30, forwards insert highlightedly and be connected with the metal thinner and make and sell sub-shape electrode 31 than its internal diameter.The rear end side of pin shape electrode 31 forms spiral spring, is accommodated in to be coated with in the flow path 29, utilizes the application of force of this spring, and pin shape electrode 31 is held in forwards outstanding state.In the present embodiment, having used the less aqueous coating of resistance, metal as coating is coating.Metal is made and sold electric conductivity that sub-shape electrode 31 utilizes its coating and is connected with the electric property of coating case of not shown ground connection, is maintained at earthing potential.
In the inside of paint spray nozzle 24, and a plurality of atomizing air streams 33 that are coated with flow path 29 concentric circles configurations form poroid between the rear and front end face that runs through paint spray nozzle 24.The front end of atomizing air stream 33 be communicated with by the ring-type atomizing air stream 33a that the inside surrounded of the front end face of paint spray nozzle 24 and airhood 40.
The leading section of paint spray nozzle 24 is covered by airhood 40.The front end peripheral part of paint spray nozzle 24 towards front, protrude big circular of diameter, this cyclic lug 34 is chimeric with the recess 35 of airhood 40 the insides.Under this state, airhood 40, by with from the front end outer peripheral edges of bobbin 2 stop-nut 37 that screws togather of the outer peripheral face of the outstanding cylindrical portion 36 that forms forwards, fix with the state of pushing paint spray nozzle 24 to.Its result has formed by the inside of airhood 40, the outer peripheral face of paint spray nozzle 24, the inner peripheral surface of cylindrical portion 36, the annular spaces that front end face surrounded of bobbin 2.This space utilizes as the installing space of figure air flow circuit 45 and electrode 13.
Central portion at airhood 40 is equipped with atomizing air squit hole 32, can insert logical described coating discharge opening 30.Atomizing air squit hole 32 is communicated with described ring-type atomizing air stream 33a, atomizing air by atomizing air squit hole 32 interior week and the annular gap between the periphery of coating discharge opening 30 forwards spray.Around atomizing air squit hole 32, be equipped with a plurality of assistant figure air squit hole 38a that are communicated with ring-type atomizing air stream 33a equally, forwards spray as the assistant figure air from atomizing air stream 33 compressed and supplied air.
And, be formed with 1 opposed and forwards outstanding across corner 39 of left and right directions from the surperficial two ends of airhood 40, on each bight 39, be formed be communicated with described figure air flow circuit 45 a plurality of (among Fig. 3, about have 2 respectively) figure air squit hole 38, as compressed-air actuated figure air to the ejection of oblique inboard the place ahead.
The compressed air that atomizing air and figure air are used, never illustrated compressed air generator is supplied with to the air hose joint 41 that is installed on handle 3 bottoms by the pressure-air flexible pipe.By the air flow circuit 42 in the handle 3, guiding is located at the air valve 43 of bobbin 2 rearward end to compressed air from this.
Additional high-tension electrode 13 forms ring-type.Electrode 13 is incorporated in the ring-type figure air flow circuit 45 between the inner peripheral surface of cylindrical portion 36 of the outer peripheral face of paint spray nozzle 24 and bobbin 2 front ends, waits by welding to be fixed in the front end face slightly on the front end of outstanding stub 12 that keeps body 10 from described resistance.In the part of ring electrode 13, the arcuation fixture 47 that is made of insulating materials that is used to prevent to vibrate is installed.The inboard of fixture 47 contacts with the outer peripheral face of paint spray nozzle 24, and the outside contacts with the inner peripheral surface of cylindrical portion 36, limits moving of electrode 13, to prevent its vibration.
The following describes the effect of spray gun 1 of the present embodiment of structure like this.When drawing back trigger 28, paint valve 20 is opened, and the coating of supplying with from joint 15 spues to being coated with flow path 29, transmits from the surface of the coating discharge opening 30 distribution shape electrodes 31 of paint spray nozzle 24 front ends and the film shape spues.Simultaneously the high voltage to grid 4 in produces loop 55 supply high frequency voltages, is additional to electrode 13 by the dc high voltage of tens thousand of V of high voltage rectifier loop 57 generations by high resistance body 11.
Because pin shape electrode 31 utilizes the electric conductivity of coating and ground connection, therefore, produced the powerful electric field that high-tension electrode 13 directions is arranged towards additional from the surface of pin shape electrode 31.Thus, on the surface of the pin shape electrode 31 surperficial coating that transmit, bring out electric charge a large amount of and high voltage polarity opposite polarity electrode 13 with electric conductivity.When drawing back trigger 28, the compressed air of break-through atomizing air stream 33 by atomizing air squit hole 32 interior week and the close gap between the periphery of coating discharge opening 30, forwards spray as atomizing air.The mist principle is blown in the coating collision of transmitting on the surface of this atomizing air and electrode 13, utilization makes the coating atomizing.When spraying, also spray as the assistant figure air from assistant figure air squit hole 38a from atomizing air stream 33 compressed and supplied air with this atomizing air.This assistant figure air also can play complementary effect to the atomizing of coating.
The coating particle of atomizing like this, the electric charge of being responded to when keeping with pin shape electrode 31 surperficial contacts is to dispersing in the air.That is the coating particle that, is atomized has with the opposite polarity polarity of electrode 13.
On the other hand, to figure air flow circuit 45 compressed and supplied air, effectively spray to oblique inboard the place ahead as the figure air squit hole 38 in the bight 39 of figure air about be located at.This figure air makes the spray pattern of the coating particle of atomizing form the ellipse that is suitable for spraying.In addition, when forming this spray pattern, the assistant figure air that sprays from described assistant figure air squit hole 38a also can play complementary effect.
Coating particle mainly be by this figure air conveyance near coated article.Charged coating particle is in case near coated article, on the surface of the coated article of ground connection, utilizes electrostatic induction and brings out electric charge with the opposite charge polarity of coating particle.Like this, electrostatic force and worked between the opposite polarity electric charge that brings out, coating particle is subjected to the attraction towards coated article.Utilize this attraction and coating particle is sprayed on the coated article surface by the both sides' of the power of blowing of figure air power.Because of the caused attraction of electrostatic force in action, coating particle also raps around to the dorsal part of coated article, is not coating in the face of the dorsal part of the coated article of spray gun 1 also is coated with.Utilize above acting on to carry out electrostatic spraying on the coated article.
In the present embodiment, concentrating power line, becoming highfield, so discharge in the leading section generation of pin shape electrode 31 sometimes at the front end of pin shape electrode 31.Discharge current flows to electrode 13 from pin shape electrode 31 front ends by figure air squit hole 38.Utilize this discharge to form the ionization collar region near pin shape electrode 31 front ends, the coating particle that is atomized is accepted electric charge from this ionization collar region, causes the variation of its quantity of electric charge and polarity.Because of with the charged of electrostatic induction mode and relevant by the caused charged both sides of ion that form of discharge, so the charged mechanism of the coating particle that atomizes is unusual complexity.In any case because quite strong from the figure air of figure air squit hole 38 ejection, so the coating particle that is atomized mainly be by the conveyance power of this figure air conveyance near coated article.And, utilize by the formed attraction of electrostatic force with by the both sides' of the power of blowing of figure air power to be sprayed on the coated article.
Adopt the spray gun 1 of present embodiment, can use the less aqueous coating of resistance, metal is the electrostatic spraying of coating.Because of electrode 13 is accommodated in the inside of spray gun 1, can make spray gun 1 miniaturization so compare with the outer electrode mode again.And additional high-tension electrode 13 is accommodated in the bobbin 2 of spray gun 1, so can improve security.
(the 2nd embodiment)
Present embodiment is to the embodiment after aforementioned the 1st embodiment improvement.In the structure of the 1st embodiment,,, produce split pole electric charge on the surface of airhood 40 with electrode 13 identical polars so in the synthetic resin material that forms airhood 40, produce split pole because of existing from the highfield of pin shape electrode 31 to electrode 13.Like this, in the charge particle that is atomized, from by the part of the charged coating particle that breaks away from the formed conveyance air-flow forwards of figure air sometimes by this split pole charge-trapping and attached to the surface of airhood 40.Present embodiment is a kind of embodiment that has carried out improvement in order to prevent coating from going up attached to these airhood 40 surfaces.
Fig. 6 is the longitudinal section of fore-end of the spray gun 1 of present embodiment, and Fig. 7 represents the front view of front end air cover 40, and Fig. 8 represents this airhood 40 is taken off the front view of the fore-end of state.The dissimilarity of the structure of present embodiment and the 1st example structure, the shape of on airhood 40, having added 2 floating electrodes 50 and having changed electrode 13 just, other structure is identical.Therefore, same or considerable part mark prosign in the drawings omits its explanation.
Floating electrode 50 is on the vertical line of central shaft by airhood 40 and the line that is connected 1 across corner 39, is equipped with 2 on relative central shaft is symmetrical position.The distance of decentre axle is the about 1/2 of airhood 40 radiuses, on its position, and central axes and connect the surface of airhood 40 and the back side between install.Front position and airhood 40 surperficial unanimous on the whole, the rear end is also unanimous on the whole with the back of the body surface of airhood 40.Floating electrode 50 become not only from electric property ground connection float, but also the state that floats from electrode 13.
2 floating electrodes 50, the central axis of airhood 40 is in the position of symmetry relation relatively, and the center of arc of electrode 13 is also consistent with the central shaft of airhood 40.Electrode 13 forms semi-annular shape, its two ends 13a, the relative central axis of 13b are in the position of symmetry relation, therefore, the distance between an end 13a of electrode 13 and approaching this distolateral side's the floating electrode 50a equals the other end 13b of electrode 13 and the distance between the opposing party's floating electrode 50b.
In the present embodiment, important point is that two ends 13a, the 13b of electrode 13 equates with 2 distances between 2 floating electrode 50a, the 50b.If these 2 distances equate, the then basic no problem of electrode 13 itself then.Like this, as shown in figure 10, be not semi-annular shape yet, but, form its end positions and get final product in the such shape of symmetric position with respect to central axis with bendings such as square band, pole, steel wires.Again, preferably on its two ends, as shown in figure 10 in the face of floating electrode 50 forms little projection, perhaps in the face of the shape of floating electrode 50 with the fore-end bending.In addition, in the present embodiment, the arcuation fixture 47 that is made of insulating materials is installed also, to prevent the vibration of electrode 13.
In the structure of present embodiment, the occasion in that additional high voltage has carried out electrostatic spraying also produces discharge between pin shape electrode 31 and floating electrode 50a, the 50b and between two ends 13a, the 13b of floating electrode 50a, 50b and electrode 13.This occasion, as previously mentioned, because of floating electrode 50a and electrode tip 13a, floating electrode 50b equate with distance between the electrode tip 13b, so the resistance of 2 discharge paths of discharge path by pin shape electrode 31, floating electrode 50a, electrode tip 13a and the discharge path by pin shape electrode 31, floating electrode 50b, electrode tip 13b equates.Like this, the discharge current by 2 paths equates the electric discharge phenomena of generation same degree substantially.
Discharge between discharge between pin shape electrode 31 and the floating electrode 50a, pin shape electrode 31 and the floating electrode 50b mainly is to transmit on the surface of airhood 40 and produce.Like this, in case the surface of airhood 40 produces discharge, this discharge path and be that the coating particle that adheres in the surf zone of airhood 40 at center will reduce with floating electrode 50a, 50b.
Its reason roughly consider to have following some.The 1st, can think that the relation because of floating electrode 50a, 50b makes the table of airhood 40 carry on the back the short circuit of electric property, so do not produce split pole on the synthetic resin material in its vicinity.Thus, because of the surface at airhood 40 does not produce the split pole electric charge, so be not easy to adhere to charged coating particle.In fact, in the 1st embodiment of floating electrode 50a, 50b was not installed, finding after spraying stops residually on the surface of airhood 40 soon had electric charge, but in the present embodiment, does not detect residual charge.
The 2nd, because of making along the near surface of the near surface of its discharge path and floating electrode 50a, 50b periphery, the discharge along the surface formed the ionization circle.In case produce the ionization circle, the coating particle that enters this ionization circle will be accepted charged because of its ion.Coating particle after charged repels mutually because of charged polarity is identical.Like this, coating particle just is not easy on the surface attached to airhood 40.
In the present embodiment, the charged mechanism of the coating particle that is atomized is very complicated.After being commonly considered as atomizing soon coating particle because of electrostatic induction with having gone up and the high-tension opposite polarity polarity that is additional to electrode 13.This charged coating particle along with the conveyance of figure air near coated article.But, in its conveyance way, because of the ionization circle that discharge produced on the surface of above-mentioned airhood 40, perhaps be the discharge that produced in the path of pin shape electrode 31, figure air squit hole 38, electrode 13, perhaps be the relation of ion of emitting from figure air squit hole 38 with the figure air of producing of the discharge of floating electrode 50 between electrode 13 because of airhood 40 inboards etc., make the charged particles amount of coating particle and polarity be subjected to delicate influence.
In fact, can observe by the phenomenon of conveyance near polarity its polarity inversion under the effect of the ejection intensity of figure air of the charged particles of the coating particle the coated article.Yet, near the coating particle that is atomized flying here coated article mainly is to be undertaken by the conveyance power of figure air, sudden coating particle makes the coated article surface of ground connection bring out the electric charge of opposite polarity, and this electric charge that brings out between be sprayed on the coated article under the attraction that produced and the effect by the both sides' of the formed power of blowing of figure air power.
Adopt the spray gun 1 of such present embodiment, the surface along airhood 40 between floating electrode 50 and pin shape electrode 31 produces discharge, can obtain to make the effect of the coating particle amount minimizing that is attached to airhood 40 surfaces thus.Again, the same with the 1st embodiment, because of adding in the bobbin 2 that high-tension electrode 13 is accommodated in spray gun 1,, can also obtain to improve the effect of security so can make the spray gun miniaturization.
(the 3rd embodiment)
Figure 11 represents the longitudinal section of spray gun 1 fore-end of present embodiment.The dissimilarity of the structure of present embodiment and the 2nd embodiment only is not to be provided with pin shape electrode 31.In general, power line is that the part from point, thin part produce mostly, and near the electric-field intensity it is big.If from this point, thin pin shape electrode 31 is forwards given prominence in coating discharge opening 30.Yet, even there is not this pin shape electrode 31, guarantee in earthing potential, so utilize the electrostatic induction can be atomized under electriferous state because of coating itself has electric conductivity.Again, the coating of the export department of coating discharge opening 30 and be located at and also produce discharge between the floating electrode 50 on airhood 40 surfaces.Thus, equally with the 2nd embodiment carry out electrostatic spraying, can obtain the effect identical with the 2nd embodiment.
(the 4th embodiment)
Figure 12 represents the longitudinal section of spray gun 1 fore-end of present embodiment.Figure 13 represents the front view of fore-end.
The dissimilarity of the structure of present embodiment and the 1st embodiment only is the shape of electrode 13 and airhood 40.Other structure is identical.The airhood 40 of present embodiment is a kind ofly to use the synthetic resin material of insulating properties to form dual cylindric for the front end face side that covers paint spray nozzle 24.It is mounted to the state that the end face that makes its inner core 40b is pushed on the periphery leading section of paint spray nozzle 24 with becoming airtight shape, fixes by the stop-nut 37 that the outer peripheral face with the front end cylindrical portion 36 of bobbin 2 screws togather.
Become the atomizing air stream 33a of ring-type by the part that the back side surrounded of the coniform leading section of inner core 40b, paint spray nozzle 24 and airhood 40, form the stream of atomizing air communicatively with the atomizing air stream 33 in the paint spray nozzle 24.Again, between the inner core 40b and urceolus 40h of airhood 40, be communicated with, formed the stream of figure air with the formed figure air flow circuit 45 in the radial direction outside of paint spray nozzle 24.
Axle center at the 40a of front side wall portion of airhood 40 is equipped with atomizing air squit hole 32, leads in this hole to insert to the state of outside opening inserting the coating discharge opening 30 that is leading to pin shape electrode 31.Atomizing air squit hole 32 is communicated with the atomizing air stream 33a of described ring-type, atomizing air by atomizing air squit hole 32 interior week and the annular gap between the periphery of coating discharge opening 30 forwards spray.Again, around atomizing air squit hole 32, be equipped with a plurality of assistant figure air squit hole 38a that are communicated with ring-type atomizing air stream 33a equally, forwards spray as the assistant figure air from atomizing air stream 33 compressed and supplied air.
Between the inner core 40b and urceolus 40h of the central shaft that comprises the 40a of front side wall portion, be formed with opposed mutually and forwards outstanding bight 40d, 40e at interior above-below direction.On each bight 40d, 40e, be formed with a plurality of (among Figure 12, respectively having 2 up and down) the figure air squit hole 38 that is communicated with described figure air flow circuit 45, spray to oblique inboard the place ahead as compressed-air actuated figure air.
During spraying, the compressed air by atomizing air stream 33 utilizes the principle of blowing mist to make the coating atomizing that spues from the coating discharge opening 30 of paint spray nozzle 24 from atomizing air squit hole 32 and assistant figure air squit hole 38a ejection.With its simultaneously, blow to the coating particle that is atomized from the figure air of figure air squit hole 38 ejections by figure air flow circuit 45, the spray pattern of coating particle is formed the ellipse that is suitable for spraying.
The maximum of the spray gun 1 of present embodiment is characterised in that, be arranged at the inside of described 2 bight 40d, 40e of the radially upper-lower position of the 40a of front side wall portion at the standing shape of airhood 40, taking in insulation jacketed electrode 13a, 13b by electric property insulating materials 13c covering surfaces.On this insulation jacketed electrode 13a, 13b, by spring 9, big resistive element 11, the stub 12 additional positive dc high voltages that produce loop 55 generations by described high voltage.The minus side of dc high voltage is by the not shown line of return ground connection of break-through in power connector 5.
Pin shape electrode 31 contacts with the coating with electric conductivity that the front illustrated, carries out ground connection by coating in the coating case side.Like this, between insulation jacketed electrode 13a, 13b and pin shape electrode 31, the additional dc high voltage that has high voltage to produce tens thousand of V of loop 55 generations.
Below with reference to the ideograph of the connection status of electrical system shown in Figure 15, the action and the effect of spray gun 1 of the present embodiment of structure like this is described.
As the explanation that reference Fig. 5 is done the 1st embodiment, produce the dc high voltage that loop 55 produces 30,000～60,000 V by control loop 51 and high voltage.The dc high voltage that is produced by big resistive element 11 will insulate jacketed electrode 13a, 13b as side of the positive electrode to and pin shape electrode 31 between additional.From as the insulation jacketed electrode 13a of positive pole, the power line that 13b sends, most ofly arrive airhood 40 that break-through forms by insulating materials and the pin shape electrode 31 of ground connection.Because of the coating ground connection of pin shape electrode 31, induce a large amount of negative (-) electric charges so utilize electrostatic induction on the surface of pin shape electrode 31 by electric conductivity.
Under this state, in case draw back trigger 28, then paint valve 20 is opened, and the coating in the valve chamber 21 are supplied with to the flow path 29 that is coated with of paint spray nozzle 24, spues from the coating discharge opening 30 of paint spray nozzle 24 front ends.Transmitted by the coating distribution shape electrode that spued 31 and flow to the place ahead.Negative electrical charge is brought out on surface at pin shape electrode 31.Because of coating has electric conductivity, so transmit and during flowing to the place ahead, accept negative electrical charge and be with negative electricity from pin shape electrode 31 at distribution shape electrode 31.
On the one hand, when drawing back trigger 28, air valve 43 is also opened, and compressed air is supplied with to the atomizing air stream 33 and the figure air flow circuit 45 of airhood 40 inboards.Forwards spray from atomizing air squit hole 32 and assistant figure air squit hole 38a to atomizing air stream 33 compressed and supplied air, make its atomizing with the coating collision of transmitting on the surface of pin shape electrode 31.When the coating that is atomized contacts with the surface of pin shape electrode 31 to have the state of charged negative electrical charge become particulate and to dispersing in the air.That is negative electricity on the coating particle band that, disperses.
On the other hand, spray by figure air squit hole 38 the place ahead to figure air flow circuit 45 compressed and supplied air to the 40a of front side wall portion of airhood 40.The coating particle that just has been atomized is along with the air stream conveyance forwards together of this ejection.
But,, concentrate on the fore-end of pin shape electrode 31 as shown in figure 14 in a large number from the power line that insulation jacketed electrode 13a, 13b send.Like this, near the electric-field intensity the front end of pin shape electrode 31 is very big, produces electronics with negative electrical charge and the ion with positive charge behind the air ionization.The electronics that is produced quickens and causes electron avalanche along power line under the effect of highfield, produces a large amount of electronics and cation behind the air ionization.On the other hand, the cation that is produced neutralizes with electrode collide towards negative pin shape electrode 31, but the surface of a large amount of electronics from pin shape electrode 31 is emitted during collision.
Under by the ionization of the caused air of this electron avalanche and the effect of emitting, produce a large amount of electronics near the front end of pin shape electrode 31 and emit towards periphery from the electronics of pin shape electrode 31.Its result has partly formed the negative ionization collar region that has a large amount of electronics in the front space of the 40a of front side wall portion of airhood 40.
The coating particle that atomizes under electronegative state is by the conveyance forwards of figure air, by this negative ionization collar region.By the time, coating particle is accepted electronics and further is with negative electricity.
Passed through the coating particle of negative ionization collar region, under the effect of figure air form oval-shaped spray pattern on one side, further conveyance forwards on one side, conveyance is near coated article.Electronegative coating particle is in case near coated article, induces positive charge on the surface of the coated article of ground connection because of electrostatic induction.Like this, electronegative coating particle, and this positive charge that brings out between be subjected to attraction under the effect of the electrostatic force that produced towards coated article.
Utilize these both sides' of the power of blowing of attraction that this static produces and figure air power, coating particle is sprayed on the coated article surface.Except blowing the power of figure air, the attraction that also has static also in action, so coating particle also raps around to the dorsal part of coated article, in the posterior components of the coated article of not facing spray gun 1 also sprayed coating.Utilize above acting on to carry out electrostatic spraying on the coated article.
In the present embodiment, electronegative coating particle might be attached to the surface of the 40a of front side wall portion of airhood 40 and the surface of bight 40d, 40e along power line towards insulation jacketed electrode 13a, 13b.But, from the 40a of front side wall portion of airhood 40 compressed air ejection forwards forcefully, be suppressed to Min. so the lip-deep coating to the 40a of front side wall portion of airhood 40 and bight 40d, 40e can be adhered to by figure air squit hole 38 and assistant figure air squit hole 38a.
But the power line that sends from insulation jacketed electrode 13a, 13b, also oriented foreign side runs through the urceolus 40h of airhood 40 and the power line that sends.If have this power line, the coating particle that then might make the negative electrical charge that breaks away from from spray pattern moves and is attached to the outer surface of the urceolus 40h of airhood 40 along this power line.
In order to prevent that this from adhering to, in the spray gun 1 of present embodiment, a compressed-air actuated part set shaving air ejiction opening 37a from the stop-nut 37 that is used for shaving (シ エ-ジ Application グ) air extrusive body is forwards sprayed.Shaving air ejiction opening 37a is provided with a plurality of on the whole circumference of stop-nut 37.Like this, move the coating particle that comes to the surface of the urceolus 40h of airhood 40 and forwards dispelled, be attached to the surface of urceolus 40h with prevention by the shaving air.
In the present embodiment, the surface of insulation jacketed electrode 13a, 13b is covered by insulating material 13c.Thus, electric current does not flow between insulation jacketed electrode 13a, 13b and pin shape electrode 31.Promptly, electric current no longer produces loop 55 from high voltage and continues to flow to electrode 13a, 13b, produce the dc high voltage that loop 55 produces by high voltage, just make between it generation highfield and use for the charging of the static capacity between electrode 13a, 13b and the pin shape electrode 31.Therefore, the load current supply capacity in high voltage generation loop 55 has any to get final product slightly.The outer electrode mode of enumerating in this point and one of the background technology is made a world of difference.
Electric current is mobile between insulation jacketed electrode 13a, 13b and pin shape electrode 31, and this just means the interval of can reduce to insulate jacketed electrode 13a, 13b and pin shape electrode 31.Like this, in the spray gun 1 of present embodiment, even low voltage also can generate the advantages of highfields at pin shape electrode 31 peripheries when having than the outer electrode mode.
As previously mentioned, the atomizing of coating mainly is to be undertaken by atomizing air, but should when atomizing, it is generally acknowledged: because of existing highfield between insulation jacketed electrode 13a, 13b and the pin shape electrode 31 also useful to the electronegative electrostatic force that coating produced that contacts with pin shape electrode 31 to foreign side.
Because attached on the coated article, so electric current flows to pin shape electrode 31 from coated article, the electric current that flows into pin shape electrode 31 passes and returns coated article to the earth electronegative coating particle from pin shape electrode 31 sudden backs.That is, produced electromotive force, that is to say and to generate electricity along this path.For producing the required energy of this electromotive force is not to produce loop 55 from high voltage but supplied with by compressed air.This electricity generating principle is similar to the electricity generating principle of Wei Muhusi electrostatic induction machine (Wimshurst influence machine).
As described above, adopt the spray gun 1 of present embodiment, can be suppressed under the minimal state under with the state of coating case ground connection and with near coating particle adhering to spray gun 1 front end, implementing to have used the less aqueous coating of resistance, metal is the electrostatic spraying of coating.If use distribution cable, be the electrostatic spraying of coating also then applicable to using the big solvent of resistance with pin shape electrode 31 ground connection again.
(variant embodiment)
The present invention is not limited to the above embodiments, also can implement following distortion or expansion.
Among the 4th embodiment, insulation jacketed electrode 13a, 13b are accommodated in the bight 40d of airhood 40, the inside of 40e, but also can under the state of the surperficial electric property insulation of will insulate jacketed electrode 13a, 13b, be mounted to forwards outstanding shape from bight 40d, 40e.Even so, also can carry out electrostatic spraying certainly with previous embodiments ground.
Again, among the 4th embodiment, insulation jacketed electrode 13a, 13b are installed in the radially upper-lower position with 31 clampings of pin shape electrode, but also can be installed on position to the left and right, footpath.Like this, the spray pattern of coating particle and the occasion of previous embodiment are slightly different, do not change but can carry out the electrostatic spraying this point equally.
Again, among the 4th embodiment, insulation jacketed electrode 13a, 13b total have 2, but the footpath at clamping pin shape electrode 31 also can be provided with forwards outstanding bight 40f, 40g on the position to the left and right, also can take in insulation jacketed electrode 13f, 13g (with reference to Figure 15) by the insulating material covering surfaces in this bight 40f, 40g.
Again, among the 4th embodiment, also can replace aforesaid bight 40d, 40e and form and pin shape electrode 31 surrounded and outstanding annulus 29a, the ring-type insulating bag is installed in this annulus 29a be covered electrode 13d (with reference to Figure 16).Like this, has the effect that strengthens near the electric-field intensity the pin shape electrode 31 and enlarge the negative ionization collar region.
Among the 4th embodiment,, pin shape electrode 31 is carried out ground connection as minus side to insulation jacketed electrode 13a, the additional positive high voltage of 13b again.But also opposite polarity.When polarity was opposite, coating had positive charge atomizing, formed positive ionization collar region at the periphery of pin shape electrode 31.And coating particle is sprayed on the coated article with the state of positively charged, carries out electrostatic spraying with aforesaid embodiment the samely.
Again, among the 4th embodiment that pin shape electrode 31 is outstanding to the place ahead of airhood 40 from the coating discharge opening 30 of paint spray nozzle 24, do not implement but can have under the situation of this pin shape electrode 31 yet.Under this occasion, though the formation of the ionization collar region in airhood 40 the place aheads is more weak slightly than aforesaid embodiment, but the coating that spues from coating discharge opening 30 atomizes electronegatively, by the conveyance of figure air to coated article, so also can carry out electrostatic spraying in such an embodiment.
This occasion is formed with the fore-end at least of paint spray nozzle 24 front ends of coating discharge opening 30, also can use the conductive material of metal species to form.This occasion is compared with the occasion that fore-end is formed by insulating materials has the charged effect of the coating particle of promotion.
Again, among the 1st, the 2nd, the 4th embodiment, pin shape electrode 31 comes ground connection by the coating with electrical conductivity, but also can use distribution cable with pin shape electrode 31 ground connection.Like this, can make ground connection firm, increase security, and be applicable to that also the big solvent of resistance is the electrostatic spraying of coating.
Utilizability on the industry
In sum, electrostatic coating spray gun of the present invention is suitable for the aqueous coating, the gold that use resistance littler Genus is the spray gun that the electrostatic spraying of coating is used.
Claims (9)
1. an electrostatic coating spray gun (1), it is compressed air-atomized coating electrified to use high voltage to make, and applies on coated article, it is characterized in that, comprising:
On the outer peripheral edges of leading section, be formed with the bobbin (2) of forwards outstanding cylindrical portion (36);
Leading section, the inside that is installed on this bobbin has flow path of being coated with (29) and atomizing air stream (33) and has the paint spray nozzle made of insulating material (24) of coating discharge opening (30) at front end;
The airhood (40) that the front end face of this paint spray nozzle (24) and described bobbin (2) is covered, this airhood (40) is the outer peripheral face of face and described paint spray nozzle (24) within it, form space between the inner peripheral surface of described cylindrical portion (36) as figure air flow circuit (45), this airhood is equipped with for described coating discharge opening (30) slotting logical at central portion, and be communicated with described atomizing air stream (33), can spray compressed-air actuated atomizing air squit hole (32), around this atomizing air squit hole, be equipped with equally and be communicated with described atomizing air stream (33), can spray compressed-air actuated a plurality of assistant figure air squit holes (38a), this airhood has outstanding from both ends, the front end left and right sides, be equipped with and be communicated with 1 across corner (39) that can spray compressed-air actuated figure air squit hole (38) with described figure air flow circuit (45) to oblique inboard the place ahead;
From the forwards outstanding pin shape electrode (31) of described coating discharge opening (30);
Formation surrounds the electrode (13) of described paint spray nozzle (24) annularly in the space that becomes described figure air flow circuit (45),
With described pin shape electrode (31) ground connection, additional dc high voltage between ground connection and described electrode (13).
2. electrostatic coating spray gun as claimed in claim 1, it is characterized in that, with the vertical direction of the line that is connected described 1 across corner (39) on, at 2 positions leaving about 1/2 radius of this airhood (40) from the center on described airhood (40) surface, be provided with the surface and the floating electrode between the back side (50) that run through this airhood (40), and described electrode (13) is formed semi-annular shape, be mounted to distance between side's electrode tip of the end that makes this electrode (13) and described floating electrode (50) and equal distance between the opposing party's electrode tip of the other end of this electrode (13) and described floating electrode (50).
3. electrostatic coating spray gun, it is compressed air-atomized coating electrified to use high voltage to make, and applies on coated article, it is characterized in that,
With pin shape electrode (31) from the central portion break-through of the airhood (40) of the front face of the bobbin as body (2) that is installed on this electrostatic coating spray gun (1) to the coating discharge opening (30) of outside opening and forwards outstanding, on radially upper-lower position with the described airhood (40) of this pin shape electrode (31) clamping, be formed with the bight (40d more outstanding than described coating discharge opening (30), 40e), at this bight (40d, insulation jacketed electrode (the 13a by the insulating material covering surfaces is taken in inside 40e), 13b), with described pin shape electrode (31) ground connection, to ground connection and described insulation jacketed electrode (13a, additional dc high voltage 13b).
4. electrostatic coating spray gun as claimed in claim 3, it is characterized in that, with the footpath of the described airhood (40) of described pin shape electrode (31) clamping to the left and right on the position, also be provided with the bight (40f, 40g) more outstanding than described coating discharge opening (30), the insulation jacketed electrode (13f, 13g) by the insulating material covering surfaces is also taken in the inside of (40f, 40g) in this bight, also additional dc high voltage between ground connection and described insulation jacketed electrode (13f, 13g).
5. electrostatic coating spray gun as claimed in claim 3, it is characterized in that, replace described bight (40d, 40e) with insulation jacketed electrode (13a, 13b), periphery in described airhood (40), formation surrounds described pin shape electrode (31) and the annulus (29a) more outstanding than described coating discharge opening (30), take in ring-type insulation jacketed electrode (13d) by the insulating material covering surfaces in the inside of this annulus (29a), with described pin shape electrode (31) ground connection, additional dc high voltage between ground connection and this ring-type insulation jacketed electrode (13d).
6. as each described electrostatic coating spray gun of claim 1 to 5, it is characterized in that, described pin shape electrode (31) is not set, form the part that constitutes described coating discharge opening (30) but use conductive material instead, use has the coating of electric conductivity as described coating, additional dc high voltage between ground connection and described insulation jacketed electrode.
7. as each described electrostatic coating spray gun of claim 1 to 5, it is characterized in that, described pin shape electrode (31) is not set, and is to use coating, additional dc high voltage between ground connection and described insulation jacketed electrode as described coating with electric conductivity.
8. as each described electrostatic coating spray gun of claim 1 to 5, it is characterized in that, use distribution cable described pin shape electrode (31) ground connection.
9. as each described electrostatic coating spray gun of claim 3 to 5, it is characterized in that, near the front end of the bobbin as body (2) of electrostatic coating spray gun, Outboard Sections at the urceolus of described airhood (40) is provided with shaving air ejiction opening (37a), and the urceolus surface from this shaving air ejiction opening (37a) along described airhood (40) forwards sprays compressed air.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP087882/2003 | 2003-03-27 | ||
| JP2003087882 | 2003-03-27 | ||
| JP399464/2003 | 2003-11-28 |
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| Publication Number | Publication Date |
|---|---|
| CN1764503A CN1764503A (en) | 2006-04-26 |
| CN100574894C true CN100574894C (en) | 2009-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200480008199A Expired - Fee Related CN100574894C (en) | 2003-03-27 | 2004-03-19 | Electrostatic coating spray gun |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013132594A1 (en) * | 2012-03-06 | 2013-09-12 | 旭サナック株式会社 | Spray device for electrostatic painting |
| EP3046676B1 (en) * | 2013-09-20 | 2018-07-25 | Spraying Systems Co. | Electrostatic spray nozzle assembly |
| CN105766873B (en) * | 2016-04-06 | 2018-10-02 | 农业部南京农业机械化研究所 | A kind of electrostatic spraying method based on induction charging |
| US20190060938A1 (en) * | 2017-08-24 | 2019-02-28 | Electrostatic Spraying Systems, Inc. | System and nozzle apparatus for electrostatic spraying |
| JP7430178B2 (en) * | 2018-10-17 | 2024-02-09 | 花王株式会社 | Electrospinning device, electrospinning system, and electrospinning method |
| CN113245084A (en) * | 2021-04-27 | 2021-08-13 | 宁波立成涂装技术有限公司 | Corona ring and powder electrostatic spray gun |
| CN114751657A (en) * | 2022-05-26 | 2022-07-15 | 武汉市汉泓福玻璃有限公司 | Coated toughened glass and production process thereof |
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