A pneumatic high-speed rotary cup electrostatic spray gun

Abstract

The application discloses a high-speed rotary cup type electrostatic spraying nozzle, which comprises a base, a rotating shaft, a nozzle body, a shell, a former, a connector, a liquid distribution disc, a rotary cup, a first fastener, a second fastener, a third fastener and a bearing. The liquid spraying material sprayed by the high-speed rotary cup type electrostatic spraying nozzle is corrosive, the single coating coverage area is large, there is no liquid storage closed loop circulation area in the interior, the nozzle is convenient to replace, the coating is fully atomized, and the utilization rate is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrostatic spraying, in particular to a pneumatic high-speed rotary cup type electrostatic spraying nozzle. BACKGROUND

[0002] In the electrostatic spraying, under the voltage of high-voltage power supply, an electrostatic field with different charges is formed between the spraying cup and the coated workpiece. The rotary cup of the spraying gun is driven by a pneumatic motor. When the coating is sent to the high-speed rotary spraying cup of the spraying gun, a great acceleration is obtained to move to the edge of the rotary cup. Under the double action of centrifugal force and strong electric field, fine charged particles are formed, which move to the surface of the workpiece with opposite polarity and are deposited on the surface of the sprayed workpiece to form a uniform coating film.

[0003] At present, the electrostatic spraying technology has been widely used in the industry of spraying water paint or powder. However, in some special industries, the sprayed liquid coating contains corrosive acidic medium or valuable metal ions. The general nozzle and spraying gun cannot meet the corrosion requirements. In addition, due to the complexity of the assembled workpiece, liquid may be stored in the gap of the parts, which aggravates the corrosion of the workpiece, shortens the service life of the nozzle or spraying gun, and increases the replacement cost.

[0004] Moreover, the utilization rate of the valuable metal ions contained in the coating is required to be high. The utilization rate of ordinary coating is 85% to 90%. The high-voltage electrostatic loss is large, and the coating loss is large, which cannot meet the use.

[0005] In addition, when the coating area is large or the shape is complex, the coverage area of the ordinary nozzle or spraying gun is limited, the reciprocating frequency is high, and the coating uniformity and coating amount cannot meet the process requirements. SUMMARY

[0006] Therefore, the embodiments of the present application aim to provide a pneumatic high-speed rotary cup type electrostatic spraying nozzle to at least solve the above technical problems.

[0007] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0008] The embodiments of the present application provide a pneumatic high-speed rotary cup type electrostatic spraying nozzle, which comprises a base, a rotating shaft, a nozzle body, a shell, a former, a connector, a liquid distribution disc and a rotary cup, wherein

[0009] The base is used for inputting compressed air;

[0010] The nozzle body and the rotating shaft of the base are assembled to form an inner cavity. The lower end surface of the nozzle body is provided with an air hole for filling the inner cavity with compressed air, which acts on the impeller of the rotating shaft to provide power for the rotation of the rotating shaft.

[0011] The first gas passage is arranged in the shell, and the end of the first gas passage is provided with a slope and an inclination for entering most compressed air,

[0012] The former, the rotating shaft and the distributor form a cavity, the compressed air outlet plane of the former is a circular arc, the lower end surface of the distributor is a slope, the lower end surface of the distributor and the upper end surface of the former form an inclined gas passage for compressed air, and the distributor is provided with an opening on the side.

[0013] The former, the shell and the spray head body form a charged paint particle passage for inputting charged paint particles, the inside of the cavity passage of the former is a cone, and the lower end surface of the upper part of the former is an arc for spraying charged paint particles under the action of high-speed rotation of the rotating shaft.

[0014] The rotating cup is used to carry the charged paint particles sprayed by the former to the first arc angle position of the rotating cup, spread upward, flow on the inner wall of the rotating cup in the form of a film, and reach the tip, so that the charged paint particles are attracted to the coated surface under the action of electrostatic force to form a uniform coated surface.

[0015] Further, the impeller is a special-shaped and partial vortex impeller, and an adjusting air hole is arranged at the position of the impeller and is perpendicular to the lateral section of the impeller, for adjusting the air injection of compressed air to the rotating shaft, so as to adjust the rotating speed of the rotating shaft.

[0016] Further, the nozzle of the paint sprayer is arranged in the charged paint particle passage formed by the former, the shell and the spray head body.

[0017] Further, the rotating shaft and the shell form a second gas passage for entering part of the compressed air, the outlet of the end flow guide pipe of the first gas passage causes shaft side pressure to the rotating shaft, and the rotating force is enhanced. Further, an adjuster is arranged in the adjusting air hole, for adjusting the air amount of the second gas passage of the shell, adjusting the rotating speed of the rotating shaft, and adjusting the diameter of the charged paint particles.

[0018] Further, a first fastener, a second fastener, a third fastener and a bearing are arranged, the rotating shaft is matched by the first fastener, the third fastener and the bearing, the former, the shell and the spray head body are integrally connected by the second fastener, and the spray head body and the base are connected by a sealing thread.

[0019] Further, the rotating cup inner surface atomized particles flow outward, the local disturbance vortex intensity is low so that the charged paint particles are discharged.

[0020] Further, the material of the spray head is a corrosion-resistant lightweight material.

[0021] Further, the material of the spray head is a non-corrosion-resistant material, and a corrosion-resistant coating is provided on the outer layer.

[0022] The pneumatic high-speed rotating cup type electrostatic spraying head provided by the application is integrally connected without gaps, has a smooth appearance after assembly, has no obvious dead angle area, is easy to maintain in an acidic working environment, uses simple workpieces, is easy to assemble, and loss parts are easy to replace, and the matching position of the internal cavity is guided by pneumatic flow, and there is no liquid closed loop circulation area. The spray range shape of the spray head presents a high dispersion fan shape, and there is no missed coating area and uneven situation, and the utilization rate of the sprayed coating can reach 90-95%, and in the plant where the spray head operates, the charged paint particles are fully atomized and are all utilized by electrostatic force, and the dispersion into the air is basically eliminated. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a longitudinal sectional view of the pneumatic high-speed rotating cup type electrostatic spraying head in the application;

[0024] Fig. 2 is a partial longitudinal sectional view of the pneumatic high-speed rotating cup type electrostatic spraying head in the application;

[0025] Fig. 3 is a transverse sectional view of the pneumatic high-speed rotating cup type electrostatic spraying head in the application. DETAILED DESCRIPTION

[0026] The technical solutions of the application are further described in detail below in combination with the drawings and specific embodiments.

[0027] In the specific embodiments, various specific technical features in each of the various embodiments described in the specific embodiments can be combined in various combinations, for example, different specific technical features can form different embodiments by combination, in order to avoid unnecessary repetition, various possible combinations of each specific technical feature in the application are not described again.

[0028] In the embodiment description of the application, it should be noted that unless otherwise stated and limited, the term "connection" should be understood broadly, for example, it can be an electrical connection, or a communication between two elements, it can be directly connected, or indirectly connected through an intermediate medium, for those skilled in the art, the specific meaning of the above term can be understood according to the specific situation.

[0029] It should be noted that the terms "first", "second", "third" involved in the embodiments of the present application are only to distinguish similar objects, and do not represent a specific order of the objects. It can be understood that the "first", "second", "third" can be interchanged in a specific order or sequence as appropriate. It should be understood that the objects distinguished by "first", "second", "third" can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0030] The following will be described in detail Figs. 1-3 The pneumatic high-speed rotating cup type electrostatic spraying nozzle described in the embodiments of the present application is described in detail.

[0031] As Figs. 1-3 shown, the pneumatic high-speed rotating cup type electrostatic spraying nozzle includes a base 12, a rotating shaft 10, a nozzle body 7, a shell 6, a former 5, a connector 4, a distributor 2, a rotating cup 14, a first fastener 3, a second fastener 8, a third fastener 11 and a bearing 9.

[0032] Compressed air is input from the base 12, and the nozzle body 7 and the base 12 are connected by a sealing thread to form a cavity, the upper end surface of the cavity being a semicircular connection plane.

[0033] The nozzle body 7 and the rotating shaft 10 are assembled to form an inner cavity, and the lower end surface of the nozzle body 7 is provided with an air hole. Compressed air is filled into the inner cavity and acts on the impeller 10a of the rotating shaft 10 to provide power for the rotation of the rotating shaft.

[0034] A first gas passage is provided in the shell 6, and the end of the first gas passage is a slope and an inclination. Most of the compressed air enters the first gas passage, and the outlet of the end of the first gas passage causes axial pressure on the rotating shaft 10, enhancing the rotation force.

[0035] The rotating shaft 10 and the shell 6 form a second gas passage, and part of the compressed air enters the second gas passage.

[0036] The former 5, the rotating shaft 10 and the distributor 2 form a cavity, the compressed air outlet plane of the former 5 is a circular arc, and the lower end surface of the distributor 2 is a slope. The lower end surface of the distributor 2 and the upper end surface of the former 5 form an inclined gas passage for the compressed air.

[0037] The distributor 2 is laterally provided with an opening, and the distributor 2 is connected to the rotating cup 14 through the connector 4 to form a coaxial extension of the distributor and the rotating cup.

[0038] The former 5, the shell 6 and the nozzle body 7 form a charged paint particle passage 13, and the nozzle of the paint sprayer can be located in the charged paint particle passage 13 formed by the former 5, the shell 6 and the nozzle body 7.

[0039] The charged paint particles are input into the charged paint particle channel 13, the inside of the cavity channel of the shaper 5 is tapered, the lower plane of the upper end surface of the shaper 5 is arc-shaped, and the charged paint particles are sprayed under the action of the high-speed rotation of the rotating shaft 10.

[0040] The rotating cup 14 carries the charged paint particles sprayed by the shaper 5 to the first arc angle position of the rotating cup 14 and spreads upward to flow on the inner wall of the rotating cup 14 in the form of a film until reaching the tip, so that the charged paint particles are attracted to the coated surface under the action of electrostatic force to form a uniform coated surface.

[0041] The rotating shaft is matched through the first fastener 3, the third fastener 11 and the bearing 9.

[0042] The shaper 5, the shell 6 and the spray head body 7 are integrally connected through the second fastener 8.

[0043] In the embodiment, the impeller 10a is a special-shaped and partial-vortex impeller, which pushes the rotating shaft 10 to rotate at high speed under the action of compressed air.

[0044] In the embodiment, an adjusting air hole 1 is arranged at the position of the impeller 10a, which is perpendicular to the lateral section of the impeller 10a, and can adjust the air injection of the compressed air to the rotating shaft 10, so as to adjust the rotating speed of the rotating shaft 10.

[0045] In the embodiment, the spray head further comprises an adjuster (not shown) which enters the adjusting air hole 1 and can adjust the air volume of the first gas channel of the shell 6 to adjust the rotating speed of the rotating shaft 10, so as to adjust the diameter of the charged paint particles.

[0046] In the embodiment, when the atomized particles on the inner surface of the rotating cup 14 flow outward, the partial disturbance vortex has low intensity, so that the charged paint particles are discharged.

[0047] In the embodiment, the material of the spray head is a corrosion-resistant lightweight material or a common metal material, and a corrosion-resistant coating is arranged on the outer layer.

[0048] The working process of the pneumatic high-speed rotating cup type electrostatic spraying nozzle will be described in detail below.

[0049] The compressed air enters from the base 12, the spray head body 7 is connected with the base 12 through a sealing threaded connection, and a cavity is formed, the upper end surface of the cavity is designed as a semicircular connection plane, which can ensure that the compressed air is filled therein and vibration of the equipment caused by strong pressure is avoided.

[0050] The lower end face of the spray head body 7 has a compressed air hole to ensure that compressed air is filled into the inner cavity of the spray head body 7, which is formed by the assembly of the spray head body 7 and the rotating shaft 10. The compressed air in the cavity provides power for the rotating shaft. The compressed air acts on the position of the impeller 10a. The impeller 10a is designed to be a special-shaped, partially-vortex impeller, which can push the rotating shaft 10 to rotate at a high speed.

[0051] Most of the compressed air enters the first gas passage reserved in the shell 6. The end of the first gas passage in the shell 6 is designed with a slope and an inclination to facilitate the flow of compressed air, and there is no vortex. The outlet of the end of the first gas passage causes shaft side pressure on the rotating shaft 10 to enhance the rotation force. Part of the compressed air enters the second gas passage formed by the rotating shaft 10 and the shell 6,

[0052] The compressed air is collected into the cavity formed by the shaper 5, the rotating shaft 10, and the distributor plate 2. The compressed air outlet plane of the shaper 5 is designed in a circular arc shape to facilitate the flow.

[0053] The compressed air impacts on the lower end face of the distributor plate 2, which is designed with a slope. The lower end face of the distributor plate 2 and the upper end face of the shaper 5 form a slanting air outlet passage for the compressed air. The distributor plate 2 has a lateral opening connected to the rotating cup 14 through the connector 4. Through this multi-connection form, the coaxial extension of the distributor plate 2 and the rotating cup 14 can be formed.

[0054] The design of the lower end face of the distributor plate 2 can effectively remove part of the compressed air pressure, and the rotating cup 14 is extremely easy to be thrown out under the action of centrifugal force and particulate matter caused by the high-speed rotation of the rotating shaft 10. The distributor plate 2 can effectively prevent the rotating cup 14 from being thrown out, and through the close cooperation of the connector 4, the damage of parts caused by gap vibration can be reduced.

[0055] The setting angle of the adjustment air hole 1 is perpendicular to the lateral section of the impeller, which can effectively adjust the air injection effect of the compressed air on the rotating shaft 10. At the same time, the adjustment of the regulator into the adjustment air hole can also adjust the air volume of the first gas passage of the shell 6, which can adjust the rotating speed of the rotating shaft 10, and then adjust the average diameter of the charged coating particles decomposed into small particles.

[0056] The rotating shaft 10 is cooperated with the main body structure through the first fastener 3, the third fastener 11, and the radial bearing of the bearing 9. The cooperation between the balls and the raceways of the bearing greatly reduces friction, and also enables the rotating shaft 10 to rotate at a high speed.

[0057] The former 5, the shell 6, the nozzle body 7 are integrally connected by the second fastener 8 without gap, the appearance is smooth after assembly, there is no obvious dead angle area, it is easy to maintain in the acidic working environment, and the workpiece used is simple and easy to assemble, and the matching position of the cavity formed in the inside is guided by the air, and there is no liquid closed loop circulation area.

[0058] The former 5, the shell 6 and the nozzle body 7 are tightly matched to form the charged paint particle channel 13, the nozzle of the paint sprayer can be deeply inserted into the pipeline, the charged paint particles enter the charged paint particle channel 13 and adhere to the smooth inner wall of the channel, and are sprayed outwards from the cavity channel inner wall of the former 5 through high-speed rotation of the rotating shaft 11, the cavity channel inner wall of the former 5 is conical, and the lower end surface of the upper part of the former 5 is arc-shaped, thereby providing a spraying channel for the charged paint particles.

[0059] Due to the centrifugal force of high-speed rotation, the paint is fully atomized, and the average diameter of the atomized charged paint particles after decomposition is 10-20 μm.

[0060] After the charged paint particles are sprayed out of the cavity of the former 5, they reach the first arc angle position of the rotating cup 14 and spread upwards to flow on the inner wall of the rotating cup 14 in the form of a film until reaching the tip, and the charged particles are attracted to the coated surface due to the action of electrostatic force, thereby forming a uniform coated surface.

[0061] The inner surface of the rotating cup 14 is designed to avoid the self-rotation of compressed air and the rotation of air and particles in the local space, the local disturbance vortex intensity is low, and the particles are conveniently discharged from the nozzle.

[0062] In order to improve the corrosion resistance, the material of the pneumatic high-speed rotating cup type electrostatic spraying nozzle is a corrosion-resistant lightweight material, such as but not limited to the following: metal titanium, titanium alloy or non-metal PEEK. Or use ordinary metal material, and perform corrosion-resistant coating on the outer layer.

[0063] The pneumatic high-speed rotating cup type electrostatic spraying nozzle in the embodiment is integrally connected without gap, the appearance is smooth after assembly, there is no obvious dead angle area, it is easy to maintain in the acidic working environment. The workpiece used is simple and easy to assemble, and the matching position of the cavity formed in the inside is guided by the air, and there is no liquid closed loop circulation area. The spray shape of the nozzle presents a fan shape with high dispersion, and there is no missed coating area and uneven situation, the utilization rate of the sprayed paint can reach 90-95%, and in the plant where the nozzle operates, the charged paint particles are fully atomized and utilized by electrostatic force, and the dispersion into the air is basically eliminated.

[0064] The use of the pneumatic high-speed rotating cup type electrostatic spraying nozzle is not limited to the electrode spraying direction in the electrolysis field, and can also be used in other popular fields of electrostatic spraying.

[0065] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A pneumatic high-speed rotary cup electrostatic spray nozzle, characterized in that: It includes a base, a rotating shaft, a nozzle body, a shell, a former, a connector, a liquid separation plate, and a rotary cup, wherein: The base is used to input compressed air; The nozzle body and the rotating shaft are assembled to form an inner cavity. The lower end surface of the nozzle body is provided with an air hole for compressed air to be filled into the inner cavity and act on the impeller of the rotating shaft to provide rotational power for the rotating shaft. A first gas channel is provided in the housing, wherein a terminal guide pipe of the first gas channel is sloped and inclined for admitting a majority of the compressed air; The former, the rotating shaft and the liquid separation plate form a cavity; the compressed air outlet plane of the former is arc-shaped; the lower end surface of the liquid separation plate is sloped; the lower end surface of the liquid separation plate and the upper end surface of the former form an oblique gas outlet channel for compressed air; the liquid separation plate is laterally provided with an opening; the liquid separation plate is connected to the bell cup via the connector, forming a coaxial extension of the liquid separation plate and the bell cup; The former, the shell and the nozzle body form a charged paint particle channel for inputting charged paint particles. The interior of the cavity channel of the former is conical, and the lower end surface of the upper part of the former is arc-shaped, for ejecting the charged paint particles under the high-speed rotation of the rotating shaft; The rotary cup is used to bring the charged paint particles sprayed from the former to the first arc angle position of the rotary cup, and spread them upward, flowing on the inner wall of the rotary cup in the form of a thin film until they reach the tip, so that the charged paint particles are attracted to the coated surface under the action of electrostatic force, forming a uniformly coated surface.

2. The pneumatic high-speed rotary cup electrostatic spray nozzle according to claim 1, characterized in that: The impeller is a specially shaped, local vortex impeller, and an adjusting air hole is opened at the position of the impeller. The adjusting air hole is perpendicular to the lateral section of the impeller and is used to adjust the air injection effect of compressed air on the rotating shaft, thereby adjusting the rotation speed of the rotating shaft.

3. The pneumatic high-speed rotary cup electrostatic spray nozzle according to claim 1, characterized in that: The nozzle of the paint injector is located in a charged paint particle channel formed by the former, the shell and the spray head body.

4. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: The nozzle body and the base are connected to form a cavity, and the upper end surface of the cavity is a semi-arc-shaped connecting plane.

5. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: The invention also includes a regulator, which enters the regulating air hole and is used to adjust the ventilation volume of the first gas channel of the shell to adjust the rotation speed of the rotating shaft, thereby adjusting the diameter of the charged paint particles.

6. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: The rotating shaft and the shell form a second gas channel for the intake of part of the compressed air; the outlet of the guide pipe at the end of the first gas channel creates axial side pressure on the rotating shaft, thereby increasing the rotational force.

7. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: The nozzle body further comprises a first fastener, a second fastener, a third fastener and a bearing, wherein the rotating shaft is matched with the first fastener, the third fastener and the bearing; the former, the shell and the nozzle body are integrally connected by the second fastener; The nozzle body is connected to the base via a sealing thread.

8. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: When the atomized particles on the inner surface of the vortex cup flow outward, the local disturbance vortex intensity is low so that the charged paint particles can escape.

9. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: The material of the nozzle is corrosion-resistant and lightweight material.

10. The pneumatic high-speed rotary cup electrostatic spray nozzle according to claim 9, characterized in that: The corrosion-resistant lightweight material is a metallic material such as titanium, a titanium alloy, or a non-metallic material such as PEEK.

11. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: The material of the nozzle is a non-corrosion-resistant material, and an anti-corrosion coating is provided on the outer layer of the non-corrosion-resistant material.

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