Electrostatic spraying room

Abstract

The invention discloses an electrostatic spraying room which comprises a hoisting rod, an electrostatic spraying device and an electrostatic spraying device. The electrode assembly is arranged at the bottom of the hoisting rod, the electrode assembly comprises a shell, fixing pieces with the number equal to that of automobile hub bolt holes are arranged on the outer side of the shell, electrode pieces are arranged at the ends, close to the automobile hub, of the fixing pieces, the electrode pieces are metal conductors, and the electrode pieces are used for stretching into the automobile hub bolt holes to change electric field distribution; the telescopic device is arranged in the fixing piece and used for driving the electrode piece to move front and back in the direction of the fixing piece, and in the actual operation process, after the automobile hub is fixed through the hoisting rod, the telescopic device drives the electrode piece to enter and stretch into a bolt hole of the automobile hub, so that distribution of an electric field is effectively changed, and the service life of the automobile hub is prolonged. The closed equipotential surface of the Faraday cage is broken, and then the spray gun evenly sprays the coating powder to the surface of the hub.

Description

Technical Field

[0001] The invention relates to the technical field of electrostatic spraying, in particular to an electrostatic spraying room. Background Art

[0002] During the electrostatic spraying process of the wheel hub, due to the existence of the Faraday shielding effect, the bolt hole area often cannot obtain a uniform coating. The Faraday shielding effect refers to the fact that during the electrostatic spraying process, when the spray particles are on the surface of the wheel hub, due to the shielding effect of the electric field, some areas, especially deep holes such as bolt holes, are difficult to obtain sufficient coating coverage. This not only affects the appearance quality of the coating, but may also cause the coating to be weak and partially missing, further affecting the corrosion resistance and service life of the wheel hub; Traditional process improvement plan: By adjusting the spraying angle of the spray gun, optimizing the voltage / current parameters, and implementing multi-angle repeated spraying and other conventional technical means, but when facing deep hole structures with a depth of more than 5mm or complex bolt holes with sunken chamfers, there are still process defects such as insufficient coating coverage at the end and accumulation at the edge of the hole; Triboelectric spraying technology: The non-corona charging method is used to charge the coating through material friction. Although it can reduce the Faraday effect, it has problems such as limited coating formula (specific dielectric properties are required) and unstable charging of atomized particles leading to fluctuations in deposition efficiency. Functional coating modification solution: Improve penetration ability by adjusting the coating's physical properties such as conductivity and dielectric constant; however, this method requires customized special coatings, which significantly increases material costs, and is difficult to universally apply due to limitations in automotive industry coating performance standards.

[0003] For this purpose, we propose an electrostatic spraying room. Summary of the invention

[0004] The purpose of the present invention is to provide an electrostatic spraying room to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions: an electrostatic spraying room, comprising: A hoisting rod, the bottom of which is used to hoist the automobile wheel hub, and the end of which is grounded; An electrode assembly, the electrode assembly is arranged at the bottom of the hanging rod, and the electrode assembly comprises: A shell, wherein the outer side of the shell is provided with fixing pieces equal in number to the bolt holes of the automobile wheel hub, and the fixing piece is provided with an electrode piece at one end close to the automobile wheel hub, wherein the electrode piece is a metal conductor, and is used to extend into the bolt hole of the automobile wheel hub to change the electric field distribution, and the electrode piece is spirally shaped to enhance the electric field distortion effect, and the electrode piece has the same polarity as the spray gun; The telescopic device is arranged in the fixing member and is used to drive the electrode member to move forward and backward along the fixing member.

[0005] Preferably, the electrode member is spiral-shaped to enhance the electric field distortion effect, and a support rod is provided at the end of the fixing member, and the top end of the support rod is fixedly connected to the end of the electrode member.

[0006] Preferably, the electrode member is cylindrical.

[0007] Preferably, the telescopic device comprises: The rotating shell is hollow inside the fixing part, a spiral groove is opened in the fixing part, a connecting ear is fixedly connected to the outer wall of the rotating shell, the connecting ear is slidably connected to the spiral groove in the fixing part, the rotating shell is rotatably connected to a limit block, an insulating spring is arranged in the fixing part, one end of the insulating spring is fixedly connected to the limit block and the other end is fixedly connected to the inner wall of the fixing part, and a driving device is arranged on the fixing part.

[0008] Preferably, the driving device comprises: The motor is arranged in a shell, the end of the internal rotating shaft of the motor is fixedly connected to a winding drum, the outer wall of the end of the fixing member is fixedly connected to a steering wheel, the steering wheel is rotatably connected to the fixing member, and the limit block is connected to the winding drum by a connecting line.

[0009] Preferably, the surface of the electrode member is divided into an exposed portion and an insulating covered portion; An adjustable high-voltage power supply, the end of the connecting line is connected to the adjustable high-voltage power supply, and the output voltage of the adjustable high-voltage power supply is ±15-25kV and is synchronized with the polarity of the spray gun.

[0010] Preferably, the end of the connecting line is grounded.

[0011] Preferably, a rubber sleeve is provided at the end of the fixing member located at the electrode member.

[0012] The present invention has at least the following beneficial effects: By designing the electrode piece in a spiral shape, the direction of the electric field can be effectively disturbed, making the electric field more uniform when entering the bolt hole and deep hole area, thereby effectively breaking the Faraday shielding effect, so that even the threaded holes with larger depth and larger aperture can be well covered by the coating, ensuring the uniformity of the coating; By designing the electrode piece to be cylindrical, the cylindrical electrode piece is suitable for bolt holes with smaller hole diameters and shallower holes; By providing the insulating covering part, it is possible to effectively prevent high-voltage current from climbing up to the hoisting rod along the surface of the electrode part, thereby avoiding the conduction of high-voltage arc along the surface of the electrode part, ensuring the electrical safety of the equipment. At the same time, by supplying power to the electrode part through the high-voltage power supply, the electrode part and the spray gun have the same polarity, thereby generating a reverse repulsive field at the difficult-to-spray parts such as the bolt hole of the wheel hub. This reverse repulsive field effectively destroys the Faraday shielding effect, so that the charged paint particles can overcome the shielding effect of the electric field, be guided into the bolt hole, and evenly cover the inner wall surface of the bolt hole; During the spraying process, the charged paint particles sprayed by the spray gun will be driven by the electric field force between the electrode and the spray gun. The paint particles are quickly pulled into the bolt hole and evenly adhere to the inner wall surface of the bolt hole along the direction of the electric field force. In this way, the paint particles can form a uniform coating in the bolt hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the hoisting rod of the present invention; Figure 3 This is a schematic diagram of the structure of the electrode assembly of the present invention; Figure 4 This is a schematic structural diagram of the electrode assembly of the present invention from another perspective; Figure 5 It is a schematic diagram of the internal cross-sectional structure of the housing of the present invention; Figure 6 It is a schematic diagram of the internal cross-sectional structure of the fixing member of the present invention; Figure 7 This is a structural diagram of Embodiment 2 of the present invention; Figure 8 This is a structural diagram of embodiment 3 of the present invention.

[0014] In the figure: 10, lifting rod; 20, electrode assembly; 21, shell; 22, fixing part; 23, electrode part; 30, telescopic device; 31, rotating shell; 32, spiral groove; 33, connecting ear; 34, limit block; 35, insulating spring; 36, driving device; 361, motor; 362, winding reel; 363, steering wheel; 364, connecting wire; 233, adjustable high-voltage power supply; 231, exposed part; 232, insulating covering part; 51, rubber sleeve; 41, supporting rod. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Example 1: Please refer to Figure 1-8 The present invention provides a technical solution: an electrostatic spraying room, comprising: A hoisting rod 10, the bottom of which is used to hoist the wheel hub of the car, and the end of which is grounded; The electrode assembly 20 is disposed at the bottom of the hanging rod 10, and the electrode assembly 20 includes: A housing 21, wherein the outer side of the housing 21 is provided with fixing members 22 equal in number to the bolt holes of the automobile wheel hub, so as to ensure that each electrode member 23 is accurately aligned with the hole position, and the fixing member 22 is provided with an electrode member 23 at one end close to the automobile wheel hub, and the electrode member 23 is a metal conductor, and the electrode member 23 is made of copper or copper alloy wire, and is used to extend into the bolt hole of the automobile wheel hub to change the electric field distribution, and the electrode member 23 is spirally shaped to enhance the electric field distortion effect, and the electrode member 23 has the same polarity as the spray gun; The telescopic device 30 is disposed in the fixing member 22 and is used to drive the electrode member 23 to move forward and backward along the fixing member 22; It should be noted that in actual operation, after the automobile wheel hub is fixed by the lifting rod 10, the telescopic device 30 will drive the electrode member 23 to enter and extend into the bolt hole of the automobile wheel hub, thereby effectively changing the distribution of the electric field and breaking the closed equipotential surface of the Faraday cage. Then, the spray gun will evenly spray the coating powder onto the surface of the wheel hub. The powder will enter the bolt hole under the guidance of the electrode member 23 and evenly adhere to its surface. In this way, it can be ensured that the bolt hole can obtain a uniform and complete coating, which greatly improves the quality and effect of the wheel hub spraying and solves the problem of uneven spraying caused by the Faraday shielding effect.

[0017] Embodiment 2: Further as Figure 7 As shown, it is worth to explain in detail that the electrode member 23 is spiral in shape to enhance the electric field distortion effect, and a support rod 41 is provided at the end of the fixing member 22, and the top end of the support rod 41 is fixedly connected to the end of the electrode member 23; It should be noted that by designing the electrode member 23 to be spiral, the direction of the electric field can be effectively disturbed, making the electric field more uniform when entering the bolt hole and the deep hole area, thereby effectively breaking the Faraday shielding effect, so that even the threaded holes with a large depth and a large aperture can be well covered by the coating, ensuring the uniformity of the coating; In addition, a support rod 41 is provided at the end of the fixing member 22, and the top end of the support rod 41 is fixedly connected to the end of the electrode member 23. The support rod 41 not only provides a stable support for the electrode member 23, ensuring that it maintains the correct position during the spraying process, but also can effectively reduce the shaking or deviation of the electrode member 23 during use, thereby ensuring the stability and consistency of the electric field. Through this design, the electrode member 23 can perform its function more accurately, further improving the spraying effect and quality, especially when processing deep holes and surfaces of complex shapes, it can ensure a high consistency of electric field guidance and coating deposition.

[0018] Embodiment 3: Further as Figure 8 As shown, it is worth to explain in detail that the electrode member 23 is cylindrical. By designing the electrode member 23 to be cylindrical, the cylindrical electrode member 23 is suitable for bolt holes with smaller and shallower hole diameters.

[0019] Further as Figure 5 and Figure 6 As shown, it is worth to explain in detail that the telescopic device 30 comprises: The rotating shell 31 is hollow inside the fixing member 22, a spiral groove 32 is provided in the fixing member 22, a connecting ear 33 is fixedly connected to the outer wall of the rotating shell 31, the connecting ear 33 is slidably connected to the spiral groove 32 in the fixing member 22, a limit block 34 is rotatably connected to the rotating shell 31, an insulating spring 35 is provided in the fixing member 22, one end of the insulating spring 35 is fixedly connected to the limit block 34 and the other end is fixedly connected to the inner wall of the fixing member 22, and a driving device 36 is provided on the fixing member 22; It is explained when necessary that when the electrode component 23 needs to be inserted into the bolt hole, it is only necessary to loosen the limit block 34 through the driving device 36. At this time, the elastic potential energy of the insulating spring 35 is converted into kinetic energy to drive the limit block 34 to move along the direction of the fixing component 22. At the same time, the rotating shell 31 moves linearly along the direction of the fixing component 22 while rotating under the action of the connecting ear 33 and the spiral groove 32, and then the rotating shell 31 drives the electrode component 23 to rotate out of the fixing component 22 and enter the bolt hole.

[0020] Further as Figure 5 As shown, it is worth to explain in detail that the driving device 36 comprises: The motor 361 is disposed in the housing 21, the end of the internal rotating shaft of the motor 361 is fixedly connected to a winding drum 362, the outer wall of the end of the fixing member 22 is fixedly connected to a steering wheel 363, the steering wheel 363 is rotatably connected to the fixing member 22, and the limit block 34 is connected to the winding drum 362 via a connecting line 364; It should be noted that the winding reel 362 is driven to rotate by the end of the internal rotating shaft of the motor 361, and the winding reel 362 drives the limit block 34 to move along the inner wall of the fixed part 22 through the connecting line 364, thereby driving the electrode part 23 to be accurately extended or retracted. Through this precisely controlled driving method, it can be ensured that the electrode part 23 can perform its tasks in an efficient and stable manner during the spraying process, avoiding the problem of uneven extension or loss of control of the electrode part 23, and ensuring the accuracy of the spraying operation and the uniformity of the coating.

[0021] Further as Figures 5 to 8 As shown, it is worth to explain in detail that the surface of the electrode member 23 is divided into an exposed portion 231 and an insulating covering portion 232; An adjustable high-voltage power supply 233, the end of the connecting line 364 is connected to the adjustable high-voltage power supply 233, the output voltage of the adjustable high-voltage power supply 233 is ±15-25kV and is synchronized with the polarity of the spray gun; It should be noted that, by providing the insulating covering portion 232, it is possible to effectively prevent high-voltage current from climbing up along the surface of the electrode member 23 to the hoisting rod 10, thereby avoiding the high-voltage arc from being conducted along the surface of the electrode member 23, ensuring the electrical safety of the equipment. At the same time, the electrode member 23 is powered by the high-voltage power supply 233, so that the electrode member 23 and the spray gun have the same polarity, thereby generating a reverse repulsive field at the difficult-to-spray parts such as the bolt hole of the wheel hub. This reverse repulsive field effectively destroys the Faraday shielding effect, so that the charged paint particles can overcome the shielding effect of the electric field, be guided into the bolt hole, and evenly cover the inner wall surface of the bolt hole; The electrode member 23 can not only ensure uniform deposition of the paint powder in the Faraday shielding area, but also prevent excessive deposition of the paint in other unnecessary areas or uneven coating, thereby significantly improving the quality and consistency of the hub surface spraying.

[0022] Further as Figure 4 As shown, it is worth to explain in detail that the end of the connecting wire 364 is grounded, and the connecting wire 364 is electrically connected to the electrode member 23; It should be noted that by grounding the end of the connecting wire 364, the potential of the electrode member 23 can be made the same as that of the earth, thereby avoiding the accumulation of charges on the surface of the electrode member 23 or the unstable electric field effect. The role of this grounding design is not only to ensure the stability of the potential of the electrode member 23, but also to form a local electric field gradient when the electrode member 23 is inserted into the bolt hole. The formation of the electric field gradient directly leads to the electric field lines that were originally unable to enter the bolt hole due to the Faraday effect. Can be effectively "pulled" into the bolt hole. This process breaks the Faraday shielding effect, allowing the electric field to penetrate into the bolt hole, ensuring that the sprayed charged paint particles can smoothly enter the bolt hole; During the spraying process, the charged paint particles sprayed by the spray gun will be driven by the electric field force between the electrode 23 and the spray gun. The paint particles are quickly pulled into the bolt hole and evenly adhere to the inner wall surface of the bolt hole along the direction of the electric field force. In this way, the paint particles can form a uniform coating in the bolt hole.

[0023] Further as Figure 5 As shown, it is worth to explain in detail that a rubber sleeve 51 is provided at the end of the fixing member 22 located at the electrode member 23; It should be noted that after each spraying is completed, some residual paint particles may adhere to the surface of the electrode member 23. If these particles are not cleaned in time, they will affect the electric field force between the electrode member 23 and the paint particles during the next use, thereby affecting the spraying effect and the uniformity of the coating. The friction of the rubber sleeve 51 can effectively remove these paint residues, ensure that the surface of the electrode member 23 remains clean, and reduce the spraying quality problems caused by paint residues. In addition, the rubber sleeve 51 is designed to have a certain elasticity and flexibility, which can make good contact with the surface of the electrode member 23 when it is screwed in, further ensuring the stripping effect of the paint particles, while avoiding damage or scratches on the surface of the electrode member 23. This stripping effect not only improves the service life of the electrode member 23, but also ensures the uniformity and high quality of the coating during each spraying process; In general, by providing the rubber sleeve 51 and utilizing the friction between it and the electrode member 23, the paint residue attached to the surface of the electrode member 23 can be effectively removed, providing a guarantee for the secondary use of the electrode member 23, thereby improving the efficiency and effect of the electrostatic spraying process and ensuring the high quality and reliability of each spraying.

[0024] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. An electrostatic spray room, characterized in that: include: A hoisting rod (10), the bottom of the hoisting rod (10) being used for hoisting a wheel hub of an automobile, and the end of the hoisting rod (10) being grounded; An electrode assembly (20), wherein the electrode assembly (20) is arranged at the bottom of the hanging rod (10), and the electrode assembly (20) comprises: A shell (21), wherein the outer side of the shell (21) is provided with fixing members (22) having the same number as the bolt holes of the automobile wheel hub, and an electrode member (23) is provided at one end of the fixing member (22) close to the automobile wheel hub, wherein the electrode member (23) is a metal conductor, and the electrode member (23) is used to extend into the bolt hole of the automobile wheel hub to change the electric field distribution, and the electrode member (23) is spirally shaped to enhance the electric field distortion effect, and the electrode member (23) has the same polarity as the spray gun; A telescopic device (30), wherein the telescopic device (30) is arranged in the fixing member (22), and the telescopic device (30) is used to drive the electrode member (23) to move forward and backward along the direction of the fixing member (22).

2. An electrostatic spray booth according to claim 1, characterized in that: A support rod (41) is provided at the end of the fixing member (22), and the top end of the support rod (41) is fixedly connected to the end of the electrode member (23).

3. The electrostatic spray booth according to claim 1, characterized in that: The electrode member (23) is cylindrical.

4. An electrostatic spraying room according to any one of claims 2 or 3, characterized in that: The telescopic device (30) comprises: The rotating shell (31) is hollow inside the fixing member (22), a spiral groove (32) is provided inside the fixing member (22), a connecting ear (33) is fixedly connected to the outer wall of the rotating shell (31), the connecting ear (33) is slidably connected to the spiral groove (32) inside the fixing member (22), a limit block (34) is rotatably connected on the rotating shell (31), an insulating spring (35) is provided inside the fixing member (22), one end of the insulating spring (35) is fixedly connected to the limit block (34) and the other end is fixedly connected to the inner wall of the fixing member (22), and a driving device (36) is provided on the fixing member (22).

5. An electrostatic spraying room according to claim 4, characterized in that: The driving device (36) comprises: A motor (361), the motor (361) being arranged in a housing (21), the end of a rotating shaft inside the motor (361) being fixedly connected to a cable reel (362), the outer wall of the end of the fixing member (22) being fixedly connected to a steering wheel (363), the steering wheel (363) being rotatably connected to the fixing member (22), and the limit block (34) being connected to the cable reel (362) via a connecting wire (364).

6. An electrostatic spray booth according to claim 5, characterized in that: The surface of the electrode member (23) is divided into an exposed portion (231) and an insulating covering portion (232); An adjustable high-voltage power supply (233), the end of the connecting line (364) is connected to the adjustable high-voltage power supply (233), and the output voltage of the adjustable high-voltage power supply (233) is ±15-25 kV and is synchronized with the polarity of the spray gun.

7. The electrostatic spray booth according to claim 5, characterized in that: The end of the connecting line (364) is grounded.

8. The electrostatic spray booth according to claim 5, characterized in that: A rubber sleeve (51) is provided at the end of the fixing member (22) located at the electrode member (23).

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