A brushless external electrostatic discharge ring electrostatic powder rotary cup spray gun device

Abstract

The present application relates to a kind of brushless external electrostatic discharge ring electrostatic powder rotary cup spray gun device, including electrostatic powder spray gun body, non-metallic insulating rotary distributor assembly, electrostatic discharge ring, drive unit for driving rotary distributor assembly rotation, and for providing high-voltage static for electrostatic discharge ring high-voltage static generation unit.First, cancel the metal part design of rotary distributor assembly, substantially reduce the capacitance effect of metal part in rotary distributor assembly itself, eliminate the phenomenon of striking fire generated in the spraying process of traditional metal rotary distributor assembly, improve safety.Both can prevent carbon brush from mixing carbon residue into powder during rotation and friction process to pollute powder, and can also reduce the cost of frequent replacement and maintenance of carbon brush, so as to reduce the use cost of spray gun.

Description

Technical Field

[0001] This invention relates to the field of electrostatic spraying technology, specifically to a brushless external electrostatic release ring electrostatic powder rotary cup spray gun device. Background Technology

[0002] Electrostatic spraying is a commonly used surface coating technology. It involves charging powder, then spraying the charged powder onto the surface of the object to be coated. The powder adheres to the surface via electrostatic attraction, forming a uniform coating. The rotary cup spray gun, as a type of electrostatic spraying technology, mainly uses a rotary distributor assembly C and carbon brushes F. A high-voltage electrostatic generator D generates high-voltage static electricity, which is transferred to the electrostatic discharge disk E at the head of the rotary distributor assembly C via sliding contact of the carbon brushes F. This charges the powder and allows it to be sprayed out.

[0003] However, this structure has the following two problems:

[0004] First, carbon brushes will wear down and shed residue, which will mix into the powder, affecting the quality of the coating and reducing the cost of carbon brush maintenance and replacement.

[0005] Second, the rotating central shaft of the rotary distributor assembly C is a metal part, which generates a strong capacitance effect inside the spray gun, making it prone to sparking during the spraying process and posing a safety hazard. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention aims to provide a brushless external electrostatic discharge ring electrostatic powder rotary cup spray gun device, including an electrostatic powder spray gun body, a non-metallic insulated rotary distributor assembly, an electrostatic discharge ring, a drive unit for driving the rotary distributor assembly to rotate, and a high-voltage electrostatic generator unit for providing high-voltage electrostatic to the electrostatic discharge ring.

[0007] The high-voltage electrostatic generating unit is embedded in the electrostatic powder spray gun body. A distributor mounting base is fixedly embedded in the electrostatic powder spray gun body. The rotary distributor assembly is coaxially rotatably disposed inside the distributor mounting base and is located near the front end of the electrostatic powder spray gun body. The electrostatic release ring is fixed to the front end of the electrostatic powder spray gun body and is coaxially disposed with the rotary distributor assembly. The high-voltage electrostatic generating unit and the electrostatic release ring are connected through a conductive unit. The center of the electrostatic powder spray gun body is a powder tube, and the inside of the powder tube is a powder channel. The periphery of the front end of the electrostatic release ring forms an electrostatic discharge tip.

[0008] In one alternative embodiment, a shaped air channel is constructed within the rotary diffuser assembly and between it and the electrostatic discharge ring, capable of ejecting a gas-solid two-phase flow powder particle cloud that mixes powder with air.

[0009] In one alternative embodiment, the shaped air channel is aligned with the outer edge of the electrostatic discharge ring to act on the path of powder ejected from the front periphery of the rotary diffuser assembly to change the shape of the powder atomization ejection area, thereby enabling control of the gas-solid two-phase flow powder particle cloud diffusion area.

[0010] In one alternative embodiment, the drive unit is a rotary pneumatic turbine built into the electrostatic powder spray gun body to drive the rotary distributor assembly to rotate.

[0011] In one alternative implementation, the drive unit is a high-speed motor that drives the rotary distributor assembly to rotate.

[0012] In one optional embodiment, the high-voltage electrostatic generating unit is a high-voltage electrostatic generator built into the body of the electrostatic powder spray gun, and the high-voltage electrostatic generator is connected to the electrostatic release ring through a conductive material.

[0013] In one optional embodiment, the high-voltage electrostatic generating unit is a high-voltage cable embedded in the electrostatic discharge ring, and the high-voltage cable is connected to an external high-voltage electrostatic generator.

[0014] In one optional embodiment, the brushless electrostatic release ring electrostatic powder rotary cup spray gun device further includes a locking cap, which is locked to the front end of the electrostatic powder spray gun body. The electrostatic release ring is flush with or protrudes from the outer end face of the locking cap, and the locking cap is a non-metallic part.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] One aspect is the direct elimination of the carbon brushes inside the traditional spray gun, abandoning the high-voltage electrostatic transmission mode that uses carbon brush friction to conduct electricity. This can prevent carbon slag from being generated during the rotation and friction of the carbon brush and mixing into the powder, thus contaminating the powder. It can also reduce the cost of frequent replacement and maintenance of carbon brushes, thereby reducing the operating cost of the spray gun.

[0017] In another aspect, the drive unit can be a high-speed motor or a rotary pneumatic turbine, driving the rotary distributor assembly to rotate at high speed. The rotary distributor assembly simultaneously generates centrifugal force and internal airflow, which causes the powder and air mixture in the powder channel to form a gas-solid two-phase flow powder particle cloud, which is then ejected from the periphery of the front end of the distributor. The high-voltage electrostatic generation unit can be a built-in high-voltage electrostatic generator or an embedded high-voltage cable connected to an external high-voltage electrostatic generator. The generated high-voltage electrostatics are transmitted to the electrostatic discharge ring through a conductive material. The powder ejected from the powder channel and the gas-solid two-phase flow powder particle cloud are captured by charged particles generated by corona discharge at the electrostatic discharge tip, becoming charged and then being ejected and diffused outward with the airflow. Under the action of the electrostatic field, the charged powder particle cloud flies towards the zero-potential surface of the workpiece to be sprayed and adheres to the workpiece surface for spraying. The rotary distributor assembly uses non-metallic insulating materials, which greatly reduces the capacitance effect of the metal parts within the rotary distributor assembly, eliminates the sparking phenomenon generated during the spraying process of traditional metal rotary distributor assemblies, and improves safety.

[0018] In another aspect, a shaping air channel is constructed between the rotary distributor assembly and the electrostatic release ring to eject a gas-solid two-phase flow powder particle cloud that mixes powder with air. The shaping air channel is connected to the outer edge of the electrostatic release ring to change the shape of the powder atomization and ejection area by acting on the path of the powder ejected from the front periphery of the rotary distributor assembly, so as to control the diffusion area of ​​the gas-solid two-phase flow powder particle cloud.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a brushless external electrostatic discharge ring electrostatic powder rotary cup spray gun device according to the present invention;

[0021] Figure 2 This is a front view of a brushless external electrostatic discharge ring electrostatic powder rotary cup spray gun device according to the present invention;

[0022] Figure 3 For the present invention Figure 2 A cross-sectional view along direction B.

[0023] Figure 4 This is a cross-sectional schematic diagram of a conventional powder rotary cup spray gun device. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] See Figures 1-3 The present invention provides a brushless external electrostatic discharge ring electrostatic powder rotary cup spray gun device, including an electrostatic powder spray gun body 1, a non-metallic insulated rotary distributor assembly 2, an electrostatic discharge ring 11, a drive unit 5 for driving the rotary distributor assembly 2 to rotate, and a high voltage electrostatic generator unit 6 for providing high voltage electrostatic to the electrostatic discharge ring 11.

[0029] like Figure 4 As shown, the rotating central shaft of the rotating distributor assembly C inside the traditional rotary cup spray gun is a metal part. The high-voltage electrostatic generator D conducts high-voltage electrostatics to the rotating central shaft of the rotating distributor assembly C through the carbon brush F. The rotating central shaft of the rotating distributor assembly C then conducts the electrostatics to the tip of the rotating electrostatic release disk E at the end. A strong capacitance effect is generated inside the rotating central shaft of the metal rotating distributor assembly C.

[0030] In response, the rotating distributor assembly 2 in this solution is designed as a non-metallic insulating component, which effectively reduces the impact of this capacitance effect problem.

[0031] Therefore, the rotary distributor assembly 2 uses non-metallic insulating materials, which greatly reduces the capacitance effect of the metal parts within the rotary distributor assembly 2, eliminates the arcing phenomenon generated during the spraying of the rotating center shaft of the traditional metal rotary distributor assembly C, and improves safety.

[0032] Furthermore, by eliminating the carbon brushes inside the traditional spray gun and abandoning the high-voltage electrostatic transmission mode that uses carbon brushes for frictional conduction, it is possible to prevent carbon slag from being generated during the rotation and friction process of the carbon brushes and mixing into the powder, thereby contaminating the powder. At the same time, it can also reduce the cost of frequent replacement and maintenance of carbon brushes, thereby reducing the operating cost of the spray gun.

[0033] In this embodiment, such as Figure 2 The high-voltage electrostatic generator 6 is embedded in the electrostatic powder spray gun body 1. The electrostatic powder spray gun body 1 is embedded with a fixed distributor mounting base 10. The rotating distributor assembly 2 is coaxially rotatably mounted in the distributor mounting base 10 and is located in the electrostatic powder spray gun body 1 near the front end. The center of the electrostatic powder spray gun body 1 is a powder tube 12 with a central channel. The powder channel 12A is formed in the center of the powder tube 12. The other end of the electrostatic powder spray gun body 1 has airflow input interfaces and powder input interfaces. The powder enters the powder channel 12A and moves with the airflow.

[0034] For example, such as Figure 1 The electrostatic discharge ring 11 is fixed to the front end of the electrostatic powder spray gun body 1.

[0035] More preferred, such as Figure 1 The electrostatic discharge ring 11 has an electrostatic discharge tip 11A formed around its front end. It should be noted that in this embodiment, the electrostatic discharge ring 11 is a fixed, non-rotating component, and the material can be carbon fiber. The electrostatic discharge tip 11A is made of metal.

[0036] like Figure 3 The high-voltage electrostatic generating unit 6 and the electrostatic release ring 11 are connected by a conductive unit. The powder channel 12A is connected to the front periphery of the electrostatic release ring 11. The outer edge of the electrostatic release ring 11 and the workpiece to be sprayed in the ground state together form a corona discharge area 8 for charging the powder.

[0037] like Figure 3 The electrostatic discharge tip 11A on the outer edge of the electrostatic discharge ring 11 carries a high voltage electrostatic charge. The powder ejected from the outer edge of the front end of the powder channel 12A from the rotating diffuser assembly 2 is captured by the charged air particles generated by the corona discharge and becomes charged.

[0038] In addition, the airflow usually forms an arc-shaped spraying area, which constitutes a corona discharge zone 8. Under the action of the electrostatic field, the powder particle cloud flies to the surface of the workpiece 7 with zero potential and is adsorbed onto the surface of the workpiece 7 to form a spray coating.

[0039] In this embodiment, a shaped air channel 2A is further constructed within the rotary diffuser assembly 2 and between it and the electrostatic release ring 11, which is capable of ejecting a gas-solid two-phase flow powder particle cloud that mixes powder with air.

[0040] In this respect, such as Figure 3 A forming air channel 2A is constructed between the rotating distributor assembly 2 and the electrostatic discharge ring 11 to eject a gas-solid two-phase flow powder particle cloud that mixes powder with air. The forming air channel 2A is connected to the outer edge of the electrostatic discharge tip 11A and is used to change the powder atomization shape of the corona discharge zone 8 in conjunction with the path control function of the powder ejected from the front periphery of the rotating distributor assembly 2, so as to control the powder spraying area of ​​the corona discharge zone 8.

[0041] Understandably, in this embodiment, the drive unit 5 is a rotary pneumatic turbine or a high-speed motor that is built into the electrostatic powder spray gun body 1 to drive the rotary distributor assembly 2 to rotate. It is usually required that the drive speed be kept between 100 and 30,000 rpm so that the rotary distributor assembly 2 can achieve sufficient centrifugal force, and the powder particles can be sprayed out faster and better adhere to the surface of the workpiece 7 to be sprayed.

[0042] Specifically, the drive unit 5 can be a high-speed motor or a rotary pneumatic turbine, which drives the rotary distributor assembly 2 to rotate at high speed.

[0043] For example, the high-voltage electrostatic generating unit 6 is a high-voltage electrostatic generator built into the body 1 of the electrostatic powder spray gun. The high-voltage electrostatic generator is connected to the electrostatic release ring 11 through a conductive material, or to an embedded high-voltage cable, which is connected to an external high-voltage electrostatic generator.

[0044] like Figure 3 The rotary distributor assembly 2 simultaneously generates centrifugal force and internal airflow, which causes a gas-solid two-phase flow powder particle cloud formed by mixing part of the powder in the powder channel 12A with air to be thrown out from the outer edge of the front end of the rotary distributor assembly 2. The high-voltage electrostatic generator unit 6 can be a built-in high-voltage electrostatic generator or an external high-voltage electrostatic generator connected by a high-voltage cable. The generated high-voltage electrostatic is transmitted to the electrostatic release ring 11 through a conductive material. The powder ejected from the powder channel 12A and the gas-solid two-phase flow powder particle cloud are captured by the charged particles generated by the corona discharge at the electrostatic discharge tip 11A and become charged. After being ejected outward with the airflow, they are dispersed. Under the action of the electrostatic field, the charged powder particle cloud flies to the surface of the workpiece 7 with zero potential and is adsorbed on the surface of the workpiece 7 for spraying.

[0045] In addition, such as Figure 3 The brushless electrostatic discharge ring 11 electrostatic powder rotary cup spray gun device also includes a locking cap 9, which is locked to the front end of the electrostatic powder spray gun body 1. The electrostatic discharge tip 11A is flush with or protrudes from the outer end face of the locking cap 9. The locking cap 9 is a non-metallic part.

[0046] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A brushless external electrostatic discharge ring electrostatic powder rotary cup spray gun device, characterized in that, It includes an electrostatic powder spray gun body, a non-metallic insulated rotary distributor assembly, an electrostatic release ring, a drive unit for driving the rotary distributor assembly to rotate, and a high-voltage electrostatic generator unit for providing high-voltage electrostatics to the electrostatic release ring. The high-voltage electrostatic generating unit is embedded in the electrostatic powder spray gun body. A distributor mounting base is fixedly embedded in the electrostatic powder spray gun body. The rotary distributor assembly is coaxially rotatably disposed inside the distributor mounting base and is located near the front end of the electrostatic powder spray gun body. The electrostatic release ring is fixed to the front end of the electrostatic powder spray gun body and is coaxially disposed with the rotary distributor assembly. The high-voltage electrostatic generating unit and the electrostatic release ring are connected through a conductive unit. The center of the electrostatic powder spray gun body is a powder tube with a powder channel inside. The periphery of the front end of the electrostatic release ring forms an electrostatic discharge tip. A shaped air channel is constructed within the rotary diffuser assembly and between it and the electrostatic discharge ring, capable of ejecting a gas-solid two-phase flow powder particle cloud that mixes powder with air. The shaped air channel is connected to the outer edge of the electrostatic discharge ring and acts on the path of the powder ejected from the front periphery of the rotary diffuser assembly to change the shape of the powder atomization ejection area, so as to control the diffusion area of ​​the gas-solid two-phase flow powder particle cloud.

2. The brushless external electrostatic release ring electrostatic powder rotary cup spray gun device according to claim 1, characterized in that, The drive unit is a rotary pneumatic turbine built into the body of the electrostatic powder spray gun to drive the rotary distributor assembly to rotate.

3. The brushless external electrostatic release ring electrostatic powder rotary cup spray gun device according to claim 1, characterized in that, The drive unit is a high-speed motor that drives the rotary distributor assembly to rotate.

4. The brushless external electrostatic release ring electrostatic powder rotary cup spray gun device according to claim 1, characterized in that, The high-voltage electrostatic generating unit is a high-voltage electrostatic generator built into the body of the electrostatic powder spray gun, and the high-voltage electrostatic generator is connected to the electrostatic release ring through a conductive material.

5. The brushless external electrostatic release ring electrostatic powder rotary cup spray gun device according to claim 1, characterized in that, The high-voltage electrostatic generating unit is a high-voltage cable embedded in and connected to the electrostatic discharge ring, and the high-voltage cable is connected to an external high-voltage electrostatic generator.

6. A brushless external electrostatic release ring electrostatic powder rotary cup spray gun device according to any one of claims 1-5, characterized in that, The brushless external electrostatic release ring electrostatic powder rotary cup spray gun device also includes a locking cap, which is locked to the front end of the electrostatic powder spray gun body. The electrostatic release ring is flush with or protrudes from the outer end face of the locking cap, and the locking cap is a non-metallic part.

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