Nozzle mechanism of electrostatic powder spray gun

Abstract

The utility model relates to the technical field of electrostatic powder spray guns, in particular to a nozzle mechanism of an electrostatic powder spray gun. The connecting pipeline is provided with a positioning groove and a first containing channel which are communicated with each other, the first containing channel is arranged in the axial direction of the connecting pipeline, and the positioning groove is located at one end of the first containing channel; wherein the electrode needle comprises a bending part, a first extending part and a second extending part, the first extending part and the second extending part are located at the two ends of the bending part, the bending part is arranged in the positioning groove, the positioning groove and the bending part are matched to be used for limiting axial displacement of the electrode needle, the first extending part penetrates through the first containing channel, and the second extending part is used for being connected with a high-voltage power source; the electrode needle is provided with the bending part, so that the connection between the electrode needle and the connecting pipeline is more stable, and the risk that the electrode needle is loosened or falls off is reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of electrostatic powder spray guns, in particular to a nozzle mechanism of an electrostatic powder spray gun. BACKGROUND

[0002] The electrostatic powder spray gun is a special spray gun for implementing electrostatic spraying of paint and powder paint, mainly applied to metal surface coating. When working, the paint sprayed out of the electrostatic powder spray gun is dispersed while making the powder particles negatively charged. The charged powder particles are coated onto the grounded coated object under the action of airflow and electrostatic force, and then are heated, melted and solidified into a film.

[0003] The utility model patent with the patent number 2021222964828 discloses a nozzle structure of an electrostatic powder spray gun, which comprises a nozzle having a first powder outlet and a mounting port at two ends, respectively. A plurality of first positioning blocks are arranged on the inner side wall of the end of the mounting port of the nozzle along the mounting direction of the nozzle. A spray head at least partially extends into the nozzle. The spray head is provided with a powder outlet channel connected to an external powder source and an electrode needle in the powder outlet channel and electrically connected to a high-voltage power supply. A plurality of second positioning blocks are arranged on the outer side wall of the spray head along the mounting direction of the nozzle. The first positioning blocks can cross one interval between the second positioning blocks and enter the previous or next interval to adjust the distance between the electrode needle and the first powder outlet.

[0004] However, the electrode needle arranged in the sheath is prone to displacement in the axial direction under the vibration or impact of the equipment, thereby causing uneven distribution of the electric field at the discharge port and affecting the uniformity of spraying. UTILITY MODEL CONTENT

[0005] In view of the deficiencies or problems in the prior art, the present disclosure provides a nozzle mechanism of an electrostatic powder spray gun, which is stable in structure and reliable in work.

[0006] The technical solution adopted by the present disclosure to solve the above technical problems is as follows: a nozzle mechanism of an electrostatic powder spray gun, comprising:

[0007] an electrode needle;

[0008] a connecting pipeline provided with a positioning groove and a first containing channel in communication with each other, the first containing channel being arranged along the axial direction of the connecting pipeline, and the positioning groove being located at one end of the first containing channel;

[0009] The electrode needle comprises a bending portion and first and second extension portions at two ends of the bending portion. The bending portion is arranged in the positioning groove, and the positioning groove cooperates with the bending portion to limit the axial displacement of the electrode needle. The first extension portion penetrates through the first containing channel, and the second extension portion is used to connect a high-voltage power supply.

[0010] As a preferred embodiment, the positioning groove comprises oppositely arranged first and second inner walls, the first inner wall is arranged opposite to the first accommodating channel, and the first inner wall is provided with an arc surface adapted to the bending part; the upper portion of the positioning groove is provided with a clearance, and one end of the second extension part passes through the clearance.

[0011] The arrangement of the arc surface can enhance the adaptability of the positioning groove to the bending part, reduce wear, and avoid waste of space. The arrangement of the clearance facilitates the connection of the second extension part and the high-voltage power supply.

[0012] As a preferred embodiment, the connecting pipeline is provided with a first pipe body and a connecting assembly, the first pipe body is arranged on the inner wall of the connecting pipeline through the connecting assembly, and the first accommodating channel is arranged on the first pipe body, and the aperture of the first accommodating channel is adapted to the diameter of the electrode needle. The first accommodating channel also plays a certain limiting role for the electrode needle, avoiding axial displacement of the electrode needle.

[0013] As a preferred embodiment, a powder outlet channel is arranged between the connecting pipeline and the first pipe body, and the powder outlet channel is used for powder ejection.

[0014] As a preferred embodiment, the connecting assembly comprises a connecting shell and at least one connecting rib, and the positioning groove is arranged on the connecting shell.

[0015] The electrode needle is arranged in the connecting shell and the first pipe body, and the powder outlet channel is arranged between the connecting pipeline and the first pipe body, so that the powder is ejected from the powder outlet channel, effectively avoiding direct contact between the electrode needle and the powder.

[0016] As a preferred embodiment, the connecting pipeline comprises a first segment and a second segment, the inner diameter of the first segment is greater than that of the second segment, and the end of the first segment away from the second segment is provided with a connecting interface, and the connecting interface is used for connecting the powder feeding mechanism.

[0017] The larger inner diameter of the first segment provides a buffer space for the powder entering the connecting pipeline, and the larger space can preliminarily disperse the powder flow when the powder enters the first segment from the powder feeding mechanism, avoiding excessive concentration of the powder. The inner diameter of the second segment is smaller than that of the first segment, which can accelerate the flow of the powder.

[0018] As a preferred embodiment, a buffer segment is arranged between the first segment and the second segment, the buffer segment is provided with a tapered guide surface, and the inner diameter of the buffer segment gradually decreases from the first segment to the second segment.

[0019] The tapered guide surface plays a smooth transition role, avoiding violent impact and disorder of the powder flow due to sudden change of the pipe diameter, so that the powder flow can enter the second segment more smoothly.

[0020] As a preferred embodiment, the connecting shell is arranged along the length direction of the connecting pipe, and the connecting shell is provided with the first flow guide structure near one end of the first section.

[0021] As a preferred embodiment, the connecting rib is arranged along the length direction of the connecting pipe, and the connecting rib is provided with the second flow guide structure near one end of the first section.

[0022] The arrangement of the first flow guide structure and the second flow guide structure enables the powder to easily pass through the surface of the connecting shell and the connecting rib, avoiding the accumulation and blockage of the powder due to the blockage of the connecting shell and the connecting rib.

[0023] As a preferred embodiment, the spray head is further provided with a second containing channel arranged along the axial direction of the spray head, the first containing channel and the second containing channel are in communication with each other, and the first containing channel and the second containing channel are located on the same axis, and the first extension passes through the second containing channel.

[0024] As a preferred embodiment, the outer peripheral wall of the first pipe body is provided with an annular recess, and the first end of the spray head is detachably sleeved on the annular recess, and the outer peripheral wall of the first end of the spray head is flush with the outer peripheral wall of the first pipe body.

[0025] Compared with the prior art, the electrode needle of the present application is provided with a bending part, which makes the connection between the electrode needle and the connecting pipe more stable, reduces the risk of loosening or falling off of the electrode needle; the positioning groove cooperates with the bending part to effectively limit the axial displacement of the electrode needle, so that the electrode needle can be stably kept in the accurate position, thereby ensuring the stability of the spray gun. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described in detail below in conjunction with the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments and therefore should not be regarded as limiting the scope of the present application. In addition, unless specifically indicated, the drawings only schematically represent the composition or structure of the described objects and can include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0027] Figure 1 is a structural schematic view of a nozzle mechanism of an electrostatic powder spray gun according to the present disclosure;

[0028] Figure 2 is a structural schematic view of a nozzle mechanism of an electrostatic powder spray gun according to the present disclosure;

[0029] Figure 3 is a sectional view of a nozzle mechanism of an electrostatic powder spray gun according to the present disclosure;

[0030] Figure 4 is a structural schematic view of a connecting pipe according to the present disclosure;

[0031] Figure 5 This is a public announcement Figure 4 A magnified view of a section at point A in the middle;

[0032] Figure 6 This is a cross-sectional view of a connecting pipe disclosed herein.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Connecting pipe; 2. Electrode needle; 3. Positioning groove; 5. Nozzle; 6. First receiving channel; 7. Bending part; 8. First extension part; 9. Second extension part; 10. Connecting interface; 11. First section; 12. Second section; 13. Buffer section; 14. Clearance opening; 15. First pipe body; 16. Powder outlet channel; 17. Connecting shell; 18. Connecting rib; 19. First flow guiding structure; 20. Second flow guiding structure. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0036] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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, the above terms should not be construed as a limitation of this utility model.

[0037] During the actual operation of the spray gun, it is inevitably affected by factors such as airflow impact and mechanical vibration. If the axial position of the electrode needle is unstable, it may move inside the spray gun, affecting the charging effect of the powder and the uniformity of the spray.

[0038] For this purpose, please refer to Figure 1 , Figure 3 and Figure 6As shown, this application provides a nozzle mechanism for an electrostatic powder spray gun, including an electrode needle 2 and a connecting pipe 1. The connecting pipe 1 is provided with a positioning groove 3 and a first receiving channel 6 that are interconnected. The first receiving channel 6 is arranged along the axial direction of the connecting pipe 1, and the positioning groove 3 is located at one end of the first receiving channel 6. The electrode needle 2 includes a bent portion 7 and a first extension portion 8 and a second extension portion 9 located at both ends of the bent portion 7. The first extension portion 8 and the second extension portion 9 are both straight structures. The bent portion 7 is disposed in the positioning groove 3. The positioning groove 3 cooperates with the bent portion 7 to limit the axial displacement of the electrode needle 2. The first extension portion 8 passes through the first receiving channel 6, and the second extension portion 9 is used to connect to a high-voltage power supply. The electrode needle 2 is provided with a bent portion 7, which can only be in the positioning groove 3 and cannot enter the first receiving channel 6. This prevents the electrode needle 2 from shifting along the first receiving channel 6, thereby making the connection between the electrode needle 2 and the connecting pipe 1 more secure and reducing the risk of the electrode needle 2 loosening or falling off. The positioning groove 3 and the bent portion 7 cooperate to effectively limit the axial displacement of the electrode needle 2, allowing the electrode needle 2 to be held in a relatively stable and accurate position, thus ensuring the stability of the spray gun operation. In addition, the setting of the bent portion 7 of the electrode needle 2 allows the first extension portion 8 and the second extension portion 9 to be located at different horizontal heights, facilitating the connection operation of the high-voltage power supply. The nozzle mechanism of this application can improve the stability and reliability of the electrostatic powder spray gun during operation, and optimize the spraying effect of the electrostatic powder spray gun.

[0039] Specifically, the positioning groove 3 includes a first inner wall and a second inner wall arranged opposite to each other. The first inner wall is positioned directly opposite the first receiving channel 6, and the first inner wall has an arc-shaped surface adapted to the bending portion 7. The arc-shaped surface enhances the adaptability of the positioning groove 3 to the bending portion 7, reducing wear, and also avoids wasting space. Furthermore, compared to a flat surface, the arc-shaped surface is more effective at dispersing stress. The arc-shaped surface can evenly distribute stress on the contact surface, preventing stress concentration at a single point, thereby reducing the risk of damage to the electrode needle 2 and the positioning groove 3 due to stress concentration.

[0040] Please refer to the following: Figure 2 As shown, to facilitate the connection between the second extension 9 and the high-voltage power supply, a clearance opening 14 is provided above the positioning groove 3, through which one end of the second extension 9 passes. This simplifies the assembly steps during the assembly of the electrostatic powder spray gun, thereby improving assembly efficiency. Furthermore, the clearance opening 14 provides sufficient operating space for the second extension 9, preventing interference between the second extension 9 and surrounding components of the positioning groove 3.

[0041] Please continue reading. Figure 3 and Figure 6As shown, in one embodiment of this disclosure, the connecting pipe 1 is provided with a first pipe body 15 and a connecting assembly. The first pipe body 15 is disposed on the inner wall of the connecting pipe 1 through the connecting assembly. A first receiving channel 6 is disposed on the first pipe body 15, and the diameter of the first receiving channel 6 is adapted to the diameter of the electrode needle 2. The first receiving channel 6 also plays a certain limiting role for the electrode needle 2. When the electrode needle 2 passes through the first receiving channel 6, the tightly fitting diameter can prevent the electrode needle 2 from shaking or shifting within the first receiving channel 6.

[0042] Specifically, a powder outlet channel 16 is provided between the connecting pipe 1 and the first tube body 15, and the powder outlet channel 16 is used for powder ejection. The connecting assembly includes a connecting housing 17 and two connecting ribs 18, and a positioning groove 3 is provided on the connecting housing 17. The electrode needle 2 is placed in the connecting housing 17 and the first tube body 15. At the same time, the powder outlet channel 16 is located between the connecting pipe 1 and the first tube body 15, and the powder is ejected from the powder outlet channel 16, effectively avoiding direct contact between the electrode needle 2 and the powder.

[0043] Specifically, the connecting pipe 1 includes a first section 11 and a second section 12. The inner diameter of the first section 11 is larger than the inner diameter of the second section 12. A connecting interface 10 is provided at the end of the first section 11 furthest from the second section 12. The connecting interface 10 is used to connect to the powder feeding mechanism. It is understood that the inner diameter of the connecting interface 10 is larger than the inner diameter of the first section 11 so that after the connecting interface 10 is connected to the powder feeding mechanism, the inner walls of the two are flush, avoiding a height difference at the connection point that could cause powder to accumulate there.

[0044] The powder may enter the connecting pipe 1 (powder outlet channel 16) in a relatively concentrated state in the powder feeding mechanism. On the one hand, the larger inner diameter of the first section 11 provides a buffer space for the powder after it enters the powder outlet channel 16, preventing pipe blockage caused by excessive flow velocity when the powder enters the powder outlet channel 16 from the powder feeding mechanism; on the other hand, the larger space allows for initial dispersion of the powder flow when the powder enters the first section 11 from the powder feeding mechanism, preventing the powder from becoming too concentrated. The inner diameter of the second section 12 is smaller than that of the first section 11, which can accelerate the powder flow.

[0045] Preferably, a buffer section 13 is provided between the first section 11 and the second section 12. The buffer section 13 is provided with a tapered guide surface, and the inner diameter of the buffer section 13 gradually decreases from the first section 11 to the second section 12. The tapered guide surface plays a role in smoothing the transition, avoiding severe impact and turbulence in the powder flow due to sudden changes in pipe diameter, thereby allowing the powder flow to enter the second section 12 more smoothly. In addition, it can also reduce the wear of powder on the inner wall of the pipe.

[0046] Please refer to Figure 4 and Figure 5As shown, it should be noted that the connecting housing 17 is arranged along the length of the connecting pipe 1, and a first flow guiding structure 19 is provided at one end of the connecting housing 17 near the first section 11. Specifically, the first flow guiding structure 19 is located at the end of the connecting housing 17. The first flow guiding structure 19 is a slope with two intersecting sides, and the included angle between the two slopes is an acute angle, so that the side of the first flow guiding structure 19 has a "V" shape.

[0047] Furthermore, the connecting rib 18 is arranged along the length of the connecting pipe 1, and a second flow guiding structure 20 is provided at one end of the connecting rib 18 near the first section 11. Specifically, the second flow guiding structure 20 is located at the end of the connecting rib 18, and the second flow guiding structure 20 is a slope with two intersecting sides, and the included angle between the two slopes is an acute angle, so that the side of the second flow guiding structure 20 has a "V" shape.

[0048] The first guide structure 19 and the second guide structure 20 facilitate smoother powder flow into the connecting pipe 1, thereby reducing friction and collision between the powder and the inner wall of the connecting pipe 1, lowering flow resistance, and improving powder conveying efficiency. They also reduce the risk of pipe blockage due to excessive resistance. Furthermore, the first guide structure 19 and the second guide structure 20 precisely guide the powder flow from the powder feeding mechanism into the powder outlet channel 16, ensuring the powder enters the connecting pipe 1 at a more appropriate direction and angle. This prevents powder scattering, deviation, or accumulation during entry, ensuring smooth powder flow within the pipe.

[0049] In one embodiment of this disclosure, a nozzle 5 is further included. The nozzle 5 has a second receiving channel along its axial direction. The first receiving channel 6 and the second receiving channel are interconnected and located on the same axis. The first extension 8 passes through the second receiving channel. The outer peripheral wall of the first tube 15 is provided with an annular concave shape. The first end of the nozzle 5 is detachably fitted onto the annular concave shape, and the outer peripheral wall of the first end of the nozzle 5 is flush with the outer peripheral wall of the first tube 15.

[0050] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A nozzle mechanism for an electrostatic powder spray gun, characterized in that, include: Electrode needle (2); The connecting pipe (1) is provided with a positioning groove (3) and a first receiving channel (6) that are interconnected. The first receiving channel (6) is provided along the axial direction of the connecting pipe (1), and the positioning groove (3) is located at one end of the first receiving channel (6). The electrode needle (2) includes a bent portion (7) and a first extension portion (8) and a second extension portion (9) located at both ends of the bent portion (7). The bent portion (7) is disposed in a positioning groove (3). The positioning groove (3) cooperates with the bent portion (7) to limit the axial displacement of the electrode needle (2). The first extension portion (8) passes through the first receiving channel (6). The second extension portion (9) is used to connect to a high-voltage power supply.

2. The nozzle mechanism of the electrostatic powder spray gun according to claim 1, characterized in that, The positioning groove (3) includes a first inner wall and a second inner wall arranged opposite to each other. The first inner wall is positioned directly opposite the first receiving channel (6), and the first inner wall is provided with an arc-shaped surface adapted to the bending portion (7). A clearance opening (14) is provided above the positioning groove (3), and one end of the second extension (9) passes through the clearance opening (14).

3. The nozzle mechanism of the electrostatic powder spray gun according to claim 1, characterized in that, The connecting pipe (1) is provided with a first pipe body (15) and a connecting assembly. The first pipe body (15) is provided on the inner wall of the connecting pipe (1) through the connecting assembly. The first receiving channel (6) is provided on the first pipe body (15). The aperture of the first receiving channel (6) is adapted to the diameter of the electrode needle (2).

4. The nozzle mechanism of the electrostatic powder spray gun according to claim 3, characterized in that, A powder outlet channel (16) is provided between the connecting pipe (1) and the first pipe body (15), and the powder outlet channel (16) is used for powder spraying.

5. The nozzle mechanism of the electrostatic powder spray gun according to claim 3, characterized in that, The connecting assembly includes a connecting housing (17) and at least one connecting rib (18), and a positioning groove (3) is provided on the connecting housing (17).

6. The nozzle mechanism of the electrostatic powder spray gun according to claim 5, characterized in that, The connecting pipe (1) includes a first section (11) and a second section (12). The inner diameter of the first section (11) is larger than the inner diameter of the second section (12). A connecting interface (10) is provided at the end of the first section (11) away from the second section (12). The connecting interface (10) is used to connect to the powder feeding mechanism.

7. The nozzle mechanism of the electrostatic powder spray gun according to claim 6, characterized in that, A buffer section (13) is provided between the first section (11) and the second section (12). The buffer section (13) is provided with a tapered guide surface, and the inner diameter of the buffer section (13) gradually decreases from the first section (11) to the second section (12).

8. The nozzle mechanism of the electrostatic powder spray gun according to claim 6, characterized in that, The connecting shell (17) is arranged along the length of the connecting pipe (1), and a first flow guiding structure (19) is provided at one end of the connecting shell (17) near the first section (11).

9. The nozzle mechanism of the electrostatic powder spray gun according to claim 6, characterized in that, The connecting rib (18) is set along the length of the connecting pipe (1), and a second flow guiding structure (20) is set at one end of the connecting rib (18) near the first section (11).

10. The nozzle mechanism of the electrostatic powder spray gun according to claim 3, characterized in that, It also includes a nozzle (5), which has a second receiving channel along its axial direction. The first receiving channel (6) is connected to the second receiving channel, and the first receiving channel (6) and the second receiving channel are located on the same axis. The first extension (8) passes through the second receiving channel.

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