Nozzle for electrostatic coating apparatus and electrostatic coating apparatus

Abstract

To improve adhesion efficiency to a material to be coated in a coating apparatus for spraying a powder coating material or a particulate material.SOLUTION: A nozzle for an electrostatic coating apparatus is attachable to a muzzle of the electrostatic coating apparatus that discharges powder paint or a particulate object, and includes a nozzle inlet connected to a muzzle outlet that is an outlet of the muzzle, a nozzle outlet that discharges the powder paint or the particulate object introduced from the nozzle inlet, a nozzle path that connects the nozzle inlet and the nozzle outlet, and a guide portion that is provided on the nozzle path and guides a flow direction of the powder paint or the particulate object flowing out from the muzzle outlet to an inner wall surface side of the nozzle path.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a nozzle for an electrostatic coating device, and an electrostatic coating device including the nozzle for an electrostatic coating device. [Background technology]

[0002] Some electrostatic coating devices are designed to discharge powder paint or particulate materials. Such electrostatic coating devices often have a nozzle attached to the tip to discharge the powder paint or other material in a predetermined pattern. There are various types of nozzles, including a flat pattern nozzle with a rectangular outlet opening for the paint or other material, and a round pattern nozzle with a circular outlet opening. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-120963 Summary of the Invention [Problem to be solved by the invention]

[0004] In electrostatic coating devices that spray powder paint or particulate materials, the quality of the coating is greatly affected by the speed at which the paint is sprayed from the nozzle. In conventional nozzles, the speed at which the paint is sprayed from the nozzle depends on the speed at which the paint is supplied to the nozzle. If the speed at which the paint is supplied to the nozzle is too fast, the speed at which the paint is sprayed from the nozzle also increases. As a result, paint sprayed at high speed from the nozzle bounces off the object being coated, making it difficult to adhere to the object. On the other hand, if the speed at which the paint is supplied to the nozzle is too slow, the paint is likely to clog the path leading to the nozzle. Furthermore, if the speed at which the paint is supplied to the nozzle is too slow, the speed at which the paint is sprayed from the nozzle also decreases, resulting in a decrease in the amount of paint reaching the object and making it difficult for the paint to adhere to the object.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a nozzle that can be attached to a coating device that sprays powder paint or particulate substances, and that can improve the adhesion efficiency to the object to be coated, and an electrostatic coating device equipped with this nozzle. [Means for solving the problem]

[0006] The nozzle for an electrostatic coating device can be attached to a muzzle of an electrostatic coating device that discharges powder paint or particulate matter, and includes a nozzle inlet connected to a muzzle outlet that is the outlet of the muzzle, and a nozzle outlet that discharges the powder paint or particulate matter introduced from the nozzle inlet; The nozzle includes a nozzle path connecting the nozzle inlet and the nozzle outlet, and a guide portion provided on the nozzle path for guiding the flow direction of the powder paint or particulate matter flowing out from the muzzle outlet toward the inner wall surface of the nozzle path.

[0007] The electrostatic coating device also includes a coating gun, a muzzle attached to the tip of the coating gun, and the nozzle attached to the muzzle. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram conceptually illustrating an example of an electrostatic coating device according to an embodiment. [Figure 2] FIG. 1 is an exploded perspective view of a muzzle and nozzle according to one embodiment. [Figure 3] FIG. 1 is a cross-sectional view illustrating the internal structure of an example muzzle and nozzle according to one embodiment. [Figure 4] FIG. 4 is an enlarged view of an example of a muzzle and a nozzle according to an embodiment, showing the portion indicated by the arrow 4 in FIG. 3. [Figure 5] Graph showing velocity distribution of paint or the like at a predetermined distance from the nozzle tip for a nozzle according to an embodiment and a conventional nozzle. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment will be described below with reference to the drawings. In the following description, the powder paint or particulate matter to be discharged by the electrostatic coating device 1 will be referred to as paint or the like. The electrostatic coating device 1 of this embodiment includes a nozzle 2, a coating gun 10, and an electrostatic controller 20. The coating gun 10 is an electrostatic coating spray gun that discharges, for example, powder paint or particulate matter by electrostatic coating, thereby applying the paint to an object 100 to be coated. In addition, in Figures 3 and 4, the paint or the like flows from right to left on the paper. That is, in Figures 3 and 4, the right side of the paper is the upstream side of the paint or the like, and the left side of the paper is the downstream side of the paint or the like.

[0010] The paint gun 10 can be configured as a so-called automatic gun that is attached to the tip of an actuator such as a reciprocator or a robot arm and that automatically paints an object to be painted. Alternatively, the paint gun 10 can be configured as a so-called manual gun that is held by an operator. The paint gun 10 includes a supply path 11, a muzzle 12, an electrode 13, and a high-voltage generator 14, and is connected to a paint supply device 80. The paint supply device 80 includes, for example, a paint tank 81, a screw feeder 82, an air supply source 83, an air supply valve 84, and an injector 85, and supplies paint, etc. stored in the paint tank 81 to the paint gun 10.

[0011] The screw feeder 82 supplies a fixed amount of paint or the like at an arbitrarily set discharge rate. The air supply source 83 is composed of a compressor or the like, and supplies compressed air to the injector 85 in response to the opening and closing of the air supply valve 84. The injector 85 receives compressed air from the air supply source 83, uses the Venturi effect to suck in the paint or the like discharged from the screw feeder 82, and supplies the paint or the like to the coating gun 10.

[0012] The muzzle 12 is detachably attached to the tip of the paint spray gun 10, and has an electrode 13 inserted therein. The muzzle 12 may be, for example, a so-called angle muzzle for changing the spray angle of paint or the like, or a so-called long muzzle for extending the spray position of paint or the like. As shown in Figures 2 to 4, the muzzle 12 has a muzzle outlet 121, which is an outlet for paint or the like. Paint or the like flowing inside the nozzle 2 flows downstream from the muzzle outlet 121.

[0013] As shown in Fig. 1, the paint gun 10 is connected to an electrostatic controller 20 via a cable. The electrostatic controller 20 supplies an AC voltage to the paint gun 10. The high voltage generator 14 outputs a DC high voltage proportional to the AC voltage input from the electrostatic controller 20. In this embodiment, the high voltage generator 14 boosts an externally input voltage by approximately 5000 to 6000 times and outputs the boosted voltage.

[0014] The high voltage generator 14 has an input transformer 141, a boost circuit 142, and an output resistor 143. The input side, i.e., the primary side, of the input transformer 141 is connected to the electrostatic controller 20. On the other hand, the output side, i.e., the secondary side, of the input transformer 141 is connected to the input side of the boost circuit 142 by, for example, a metal wire. In this way, the input transformer 141 electrically insulates the electrostatic controller 20 from the boost circuit 142, and outputs the AC voltage Vac supplied from the electrostatic controller 20 to the input side of the boost circuit 142.

[0015] The boost circuit 142 is configured by, for example, a Cockcroft-Walton type boost rectifier circuit. The boost circuit 142 boosts and rectifies the AC voltage Vac input from the input transformer 141 to convert it into a high DC voltage. The output side of the boost circuit 142 is connected to an output resistor 143 by, for example, a metal wire.

[0016] The output resistor 143 is, for example, a plate-shaped resistor, and is provided between the boost circuit 142 and the electrode 13. The high DC voltage output from the boost circuit 142 is supplied to the electrode 13 via the output resistor 143, and is output from the electrode 13 as a DC output voltage Vdc. The electrode 13 is, for example, a pin-shaped metal electrode, and passes through the muzzle 12 and extends into the nozzle 2. As a result, the DC output voltage Vdc output from the electrode 13 is applied to the fine particles of paint or the like passing through the nozzle 2.

[0017] In this embodiment, the electrostatic controller 20 supplies an AC voltage of, for example, 12 V to 20 V to the primary side of the input transformer 141 of the paint gun 10. The input transformer 141 converts the AC voltage supplied from the electrostatic controller 20 to an AC voltage of about 2 kV to 4 kV on the secondary side and outputs it to the boost circuit 142. The boost circuit 142 boosts the AC voltage supplied from the input transformer 141 to a high DC voltage of 60 kV to 100 kV and supplies it to the electrode 13.

[0018] The nozzle 2 is configured to be attachable to the muzzle 12 of the electrostatic coating device 1 that electrostatically coats paint or the like, and is used to discharge paint or the like in a predetermined pattern onto the workpiece 100. The nozzle 2 shown in Figures 2 and 3 discharges paint or the like in a round pattern. The nozzle 2 may also be configured to discharge paint or the like in a flat pattern. The nozzle 2, except for the nozzle electrode 131, is made of a highly rigid resin material or the like that has electrical insulation properties.

[0019] As shown in Figures 2 and 3, the nozzle 2 has a main body 30, an electrode holding portion 40, and a guide portion 50. The main body 30 forms the outer shell of the nozzle 2 and is configured to be attachable to the muzzle 12. The main body 30 integrally has a base end 31 and a tip end 32. The base end 31 is formed, for example, in a cylindrical shape and is connectable to, or in this case, insertable into, the muzzle 12. The tip end 32 is formed, for example, in a conical cylindrical shape whose inner and outer diameters increase toward the tip side of the nozzle 2, i.e., in the direction away from the muzzle 12.

[0020] As shown in FIG. 3 , the main body 30 has a nozzle inlet 33, a nozzle outlet 34, and a nozzle passage 35. The nozzle inlet 33 is the upstream end of the nozzle passage 35, i.e., the inlet of the nozzle passage 35, and is connected to a muzzle outlet 121, which is the outlet of the muzzle 12. As shown in FIGS. 3 and 4 , the muzzle outlet 121 has a cylindrical region with a substantially constant inner diameter, and is connected to the supply passage 11. The nozzle outlet 34 is the downstream end of the nozzle passage 35, i.e., the outlet of the nozzle passage 35. Powder paint or the like introduced into the nozzle 2 from the nozzle inlet 33 is discharged to the outside from the nozzle outlet 34. The nozzle passage 35 is formed to penetrate the nozzle 2 in the longitudinal direction of the nozzle 2, and connects the nozzle inlet 33 and the nozzle outlet 34.

[0021] The nozzle passage 35 is formed as a space that generally follows the outer diameters of the base end 31 and the tip end 32. In this embodiment, the nozzle passage 35 has a first enlarged section 351 and a second enlarged section 352. The first enlarged section 351 is formed in a conical cylindrical shape whose inner diameter increases from the muzzle 12 side toward the opposite side of the muzzle 12. That is, the first enlarged section 351 is formed in a conical cylindrical shape whose inner diameter increases from the upstream side of the paint or the like toward the downstream side. The second enlarged section 352 is formed continuously with the first enlarged section 351 and is formed in a conical cylindrical shape whose inner diameter increases from the muzzle 12 side toward the opposite side of the muzzle 12, that is, from the upstream side of the paint or the like toward the downstream side.

[0022] As shown in FIG. 4 , the longitudinal direction of the nozzle 2, i.e., the flow direction of the paint or the like discharged from the muzzle 12, i.e., the direction of the central axis J of the nozzle 2, is taken as the reference. The angle of the inner wall surface of the first expanded portion 351 relative to the reference J is taken as θ1, and the angle of the inner wall surface of the second expanded portion 352 relative to the reference J is taken as θ2. In this case, the angle θ2 of the inner wall surface of the second expanded portion 352 is set to a value smaller than the angle θ1 of the inner wall surface of the first expanded portion 351. The angle θ2 of the inner wall surface of the second expanded portion 352 can be set within a range of 5° to 15°, for example. The angle θ1 of the inner wall surface of the first expanded portion 351 can be set to an angle approximately 5° to 10° larger than the angle θ2 of the inner wall surface of the second expanded portion 352.

[0023] The electrode holding part 40 is made of an electrically insulating resin or the like, and is formed, for example, in the shape of a cylindrical rod. The longitudinal direction of the electrode holding part 40 coincides with the longitudinal direction of the nozzle 2, and is disposed on the central axis J of the nozzle 2. The electrode holding part 40 may be integrally formed from the same material as the main body part 30, or may be formed from separate materials from the base end part 31 and the tip end part 32. In this embodiment, the electrode holding part 40 is formed from a separate material from the main body part 30.

[0024] The electrode holding unit 40 has the function of holding the nozzle electrode 131 through the nozzle electrode 131 inside. The nozzle electrode 131 is electrically connected to the electrode 13 and can be considered to be a part of the electrode 13. The nozzle electrode 131 may be configured integrally with the electrode 13, or may be configured separately and electrically connected to the electrode 13 when the nozzle 2 is connected to the muzzle 12. In other words, the nozzle electrode 131 may be a component of the nozzle 2, or may be a component other than the nozzle 2.

[0025] 2, the tip of the nozzle electrode 131 protrudes slightly from the tip of the electrode holding part 40. The nozzle electrode 131 outputs the high voltage supplied from the high voltage generator 14 via the electrode 13 inside the nozzle 2, and charges the paint, etc. discharged from the nozzle 2 with a high voltage. As a result, the paint, etc. charged with a high voltage is discharged from the nozzle 2, thereby performing electrostatic coating on the workpiece 100.

[0026] The guide portion 50 is provided inside the nozzle 2, i.e., on the nozzle path 35. The guide portion 50 has the function of guiding the flow direction of paint, etc., flowing out from the muzzle outlet 121 toward the inner wall surface of the nozzle path 35, i.e., toward the radially outer side of the nozzle path 35. The guide portion 50 is provided on the nozzle inlet 33 side of the nozzle path 35. The guide portion 50 as a whole has a cross section cut along the longitudinal direction of the nozzle 2, i.e., a cross section cut perpendicular to the central axis J, which is circular, elliptical, or rounded diamond-shaped. In this embodiment, the guide portion 50 is formed in a rounded cone shape like an abacus bead.

[0027] 4, the outer diameter D1 of the guide portion 50 is set to be equal to or larger than the inner diameter D2 of the muzzle outlet 121. In this embodiment, the outer diameter D1 of the guide portion 50 is set to be larger than the inner diameter D2 of the muzzle outlet 121.

[0028] The guide portion 50 has a first inclined surface 51 and a second inclined surface 52. The first inclined surface 51 is formed as an inclined surface that widens toward the nozzle outlet 34 with respect to the direction of travel of the paint or the like discharged from the muzzle outlet 121. That is, the first inclined surface 51 is inclined in a direction away from the central axis J, i.e., so that the outer diameter increases, from the upstream side to the downstream side of the flow of the paint or the like. If the inclination angle of the first inclined surface 51 with respect to the central axis J is θ3, the inclination angle θ3 of the first inclined surface 51 is set to be greater than the angle θ1 of the inner wall surface of the first expanded portion 351 and the angle θ2 of the inner wall surface of the second expanded portion 352. In this embodiment, the inclination angle θ3 of the first inclined surface 51 is approximately equal to the angle θ1 of the inner wall surface of the first expanded portion 351. Furthermore, the inclination angle θ3 of the first inclined surface 51 is greater than the angle θ2 of the inner wall surface of the second expanded portion 352.

[0029] The second inclined surface 52 is provided on the nozzle outlet 34 side of the guide portion 50. In other words, the second inclined surface 52 is provided downstream of the first inclined surface 51. The second inclined surface 52 is formed as an inclined surface that narrows toward the nozzle outlet 34 with respect to the direction of travel of the paint or the like discharged from the nozzle outlet 34. In other words, the second inclined surface 52 is inclined in a direction approaching the central axis J, i.e., so that its outer diameter becomes smaller, as it moves from the upstream side to the downstream side of the flow of the paint or the like. In this case, the area of ​​the first inclined surface 51 is larger than the area of ​​the second inclined surface 52. Furthermore, when viewed in the longitudinal direction of the nozzle 2, the length dimension L1 of the first inclined surface 51 is longer than the length dimension L2 of the second inclined surface 52.

[0030] In the nozzle path 35, a narrow path 353 is formed between the first expansion portion 351 and the first inclined surface 51 of the guide portion 50. The narrow path 353 constitutes a part of the nozzle path 35 and is formed with a circular cross section. The cross-sectional area of ​​the narrow path 353 is smaller than the cross-sectional area of ​​the portion of the nozzle path 35 other than the narrow path 353. The angle of the narrow path 353 with respect to the reference J is determined by the angle θ1 of the first expansion portion 351 and the angle θ3 of the first inclined surface 51. In this embodiment, the angle of the narrow path 353 with respect to the reference J is equal to the angle θ1 of the first expansion portion 351 and the angle θ3 of the first inclined surface 51.

[0031] In this configuration, paint, etc. supplied from the paint supply device 80 to the paint gun 10 flows out from the muzzle outlet 121 and into the nozzle passage 35 from the nozzle inlet 33. The paint, etc. that flows into the nozzle passage 35 has its direction of travel changed radially outward by the first inclined surface 51 and passes through the narrow passage 353 between the first expanded portion 351 and the first inclined surface 51. After the paint, etc. passes over the first expanded portion 351 and the first inclined surface 51, that is, after passing through the narrow passage 353, it hits the second expanded portion 352, which changes the direction of travel of the paint, etc. slightly radially inward of the nozzle passage 35. As a result, the kinetic energy of the paint, etc. that flows into the nozzle passage 35 from the nozzle inlet 33 is consumed as it passes through the nozzle passage 35, and it is decelerated and discharged from the nozzle outlet 34.

[0032] FIG. 5 is a graph of velocity distribution showing the velocity of paint, etc., for a conventional nozzle and the nozzle 2 of the present configuration. In the experiment shown in FIG. 5, a position on the reference J that is a predetermined distance, e.g., 30 cm, from the tip of the conventional nozzle and the nozzle 2 of the present configuration is set as the zero position, and the velocity of paint, etc., is measured at predetermined intervals, e.g., 10 mm intervals, horizontally from this zero position. Note that in the experiment shown in FIG. 5, the velocity of paint, etc., supplied to the paint gun 10 equipped with the conventional nozzle and the nozzle 2 of the present configuration is the same. In FIG. 5, black circles indicate measurements using the conventional nozzle, and white squares indicate measurements using the nozzle 2 of the present configuration. As shown in FIG. 5, the nozzle 2 of the present configuration was found to reduce the velocity of paint, etc., discharged from the nozzle 2 to less than half that of the conventional nozzle.

[0033] According to the embodiment described above, the nozzle 2 for an electrostatic coating device can be attached to the muzzle 12 of the electrostatic coating device 1 that discharges powder paint or particulate matter. The nozzle 2 includes a nozzle inlet 33, a nozzle outlet 34, a nozzle path 35, and a guide unit 50. The nozzle inlet 33 is connected to a muzzle outlet 121, which is the outlet of the muzzle 12. The nozzle outlet 34 discharges the powder paint or particulate matter introduced from the nozzle inlet 33. The nozzle path 35 connects the nozzle inlet 33 and the nozzle outlet 34. The guide unit 50 is provided on the nozzle path 35 and guides the flow of the paint or the like that flows out from the muzzle outlet 121 toward the inner wall surface of the nozzle path 35.

[0034] According to this, the paint, etc. passing through the nozzle 2 has its direction of travel changed by the guide section 50 toward the inner wall surface of the nozzle path 35, and comes into contact with the inner wall surface of the nozzle path 35. As a result, the paint, etc. that has flowed into the nozzle path 35 from the nozzle inlet 33 consumes kinetic energy as it passes through the nozzle path 35, and is then decelerated and discharged from the nozzle outlet 34. Therefore, according to this configuration, the speed of the paint, etc. from the paint supply device 80 to the nozzle 2 can be increased, and the speed of the paint, etc. discharged from the nozzle 2 can be decreased.

[0035] In this way, with this configuration, by setting the speed of the paint, etc., from the paint supply device 80 to the nozzle 2 at a high speed, it is possible to prevent the speed of the paint, etc., supplied to the nozzle 2 being too slow, causing the paint, etc., to clog the path to the nozzle 2, or the speed of the paint, etc., ejected from the nozzle 2 being too slow, reducing the amount of paint, etc., that reaches the workpiece 100, making it difficult for the paint, etc., to adhere to the workpiece 100. Furthermore, by slowing down the speed of the paint within the nozzle 2, it is possible to prevent the speed of the paint, etc., ejected from the nozzle 2 being too fast, causing the paint, etc., to bounce back onto the workpiece 100. In this way, with this configuration, it is possible to improve the adhesion efficiency to the workpiece 100.

[0036] Here, if the outer diameter D1 of the guide portion 50 is smaller than the inner diameter D2 of the muzzle outlet 121, the paint or the like moving from the muzzle outlet 121 toward the guide portion 50 will not properly strike the guide portion 50, resulting in a low deceleration effect. Therefore, in this embodiment, the outer diameter D1 of the guide portion 50 is set to be equal to or larger than the inner diameter D2 of the muzzle outlet 121. This makes it easier for the paint or the like moving from the muzzle outlet 121 toward the guide portion 50 to strike the guide portion 50, and as a result, the paint or the like can be properly decelerated.

[0037] The guide portion 50 has a first inclined surface 51. The first inclined surface 51 is formed as an inclined surface that widens toward the nozzle outlet 34 with respect to the traveling direction of the paint or the like discharged from the muzzle outlet 121. As shown in FIG. 4, the angle θ3 of the first inclined surface 51 with respect to the traveling direction of the paint or the like discharged from the muzzle outlet 121, i.e., with respect to the central axis J, is set to be equal to or greater than the angle θ2 of the inner wall surface of the nozzle path 35 with respect to the traveling direction of the paint or the like discharged from the muzzle outlet 121. This ensures that the paint or the like, whose traveling direction has been changed by the first inclined surface 51, hits the inner wall surface of the nozzle path 35, thereby reliably slowing down the speed of the paint or the like.

[0038] The guide portion 50 has a second inclined surface 52. The second inclined surface 52 is provided on the nozzle outlet 34 side and is formed as an inclined surface that narrows toward the nozzle outlet 34 side with respect to the traveling direction of the paint, etc., ejected from the nozzle outlet 34. This makes it possible to prevent the paint, etc., that passes through the guide portion 50 from accumulating on the surface of the guide portion 50, particularly on the nozzle outlet 34 side. As a result, by providing the guide portion 50 inside the nozzle 2, it is possible to effectively prevent the nozzle 2 from becoming clogged with paint, etc.

[0039] The above-described embodiments are not limited to the embodiments described above and illustrated in the drawings, and may be modified as appropriate within the scope of the invention. [Explanation of symbols]

[0040] 1...electrostatic coating device, 2...electrostatic coating device nozzle, 10...paint gun, 12...muzzle, 121...muzzle outlet, 33...nozzle inlet, 34...nozzle outlet, 35...nozzle path, 50...guiding portion, 51...first inclined surface, 52...second inclined surface

Claims

1. It can be attached to the muzzle of an electrostatic coating device that discharges powder paint or particulate matter, A nozzle inlet connected to a muzzle outlet, which is an outlet of the muzzle; a nozzle outlet for discharging the powder paint or particulate matter introduced from the nozzle inlet; a nozzle path connecting the nozzle inlet and the nozzle outlet; a guide portion provided on the nozzle path and configured to guide the flow direction of the powder paint or particulate matter flowing out from the muzzle outlet toward an inner wall surface of the nozzle path; A nozzle for an electrostatic coating device.

2. The outer diameter of the guide portion is set to be equal to or larger than the inner diameter of the muzzle outlet. The nozzle for an electrostatic coating device according to claim 1.

3. the guide portion has a first inclined surface that widens toward the nozzle outlet side with respect to a traveling direction of the powder paint or particulate matter discharged from the muzzle outlet, an angle of the first inclined surface with respect to a traveling direction of the powder paint or particulate matter discharged from the muzzle outlet is set to be equal to or greater than an angle of an inner wall surface of the nozzle path with respect to the traveling direction of the powder paint or particulate matter discharged from the muzzle outlet; The nozzle for an electrostatic coating device according to claim 1.

4. the guide portion is provided on the nozzle outlet side and has a second inclined surface that narrows toward the nozzle outlet side with respect to a traveling direction of the powder paint or particulate matter discharged from the nozzle outlet. The nozzle for an electrostatic coating device according to any one of claims 1 to 3.

5. Paint gun and a muzzle attached to the tip of the spray gun; a nozzle attached to the muzzle; The nozzle is Attachable to the muzzle, A nozzle inlet connected to a muzzle outlet, which is an outlet of the muzzle; a nozzle outlet for discharging the powder paint or particulate matter introduced from the nozzle inlet; a nozzle path connecting the nozzle inlet and the nozzle outlet; a guide portion provided on the nozzle path to guide the flow direction of the powder paint or particulate matter flowing out from the muzzle outlet toward the inner wall surface of the nozzle path, Electrostatic painting equipment.

Images