A nozzle and adhesive spraying device for automotive body painting.

Abstract

This application relates to a nozzle and adhesive spraying device for automotive body painting, belonging to the technical field of automotive coating equipment. It includes a nozzle body with a fan-shaped diffusion cavity inside. One end of the nozzle body has a feed channel communicating with the small end of the fan-shaped diffusion cavity, and the other end has an outlet communicating with the large end of the fan-shaped diffusion cavity. The outlet is an arc-shaped slit with the same curvature as the large end of the fan-shaped diffusion cavity, and the symmetry plane of the outlet coincides with the symmetry plane of the fan-shaped diffusion cavity. Because the arc-shaped slit outlet has the same curvature as the large end of the fan-shaped diffusion cavity, and the symmetry plane of the outlet coincides with the symmetry plane of the fan-shaped diffusion cavity, the flow direction of the adhesive at the slit outlet matches the expansion direction of the fan-shaped diffusion cavity. This reduces the accumulation or turbulence of the adhesive at the edge of the outlet, making the travel of the adhesive strip sprayed from any position of the outlet more consistent and the thickness uniform, meeting process requirements.

Description

Technical Field

[0001] This application relates to the field of automotive painting equipment technology, and in particular to a nozzle and adhesive spraying device for automotive body painting. Background Technology

[0002] To reduce vehicle noise and vibration, and to achieve good sound insulation and shock absorption, ensuring the vehicle's NHV (Noise, Vibration, and Harshness) performance, damping materials need to be added to different parts of the vehicle body. Traditional asphalt damping sheets are gradually being replaced by LASD water-based liquid damping adhesive due to high VOC emissions and poor environmental performance. LASD liquid damping adhesive uses water as a solvent, has extremely low VOC content, and forms a uniform damping layer after spraying. This not only meets the sealing and shock absorption needs of complex parts of the vehicle body but also avoids the long-term harmful effects of asphalt evaporation on human health.

[0003] In related technologies, patent CN206868536U discloses a manual spray gun head for automotive sprayable damping materials, including a spray gun connector and a nozzle. The spray gun connector includes a spray gun connecting tube and a transition tube. One end of the spray gun connecting tube is fixedly connected to one end of the transition tube, and the one end of the spray gun connecting tube has an internal thread. The transition tube has a material passage inside, and the other end of the transition tube is fixedly connected to the material inlet end of the nozzle. The nozzle outlet is rectangular, which has the advantage of rapid material discharge. However, the following problems are exposed when adapting to the characteristics of LASD materials.

[0004] Its outlet is a long rectangular strip, resulting in a significant difference in the fluid path between the center and the edges of the outlet. Specifically, the distance from the center of the outlet to the feed end is less than the distance from both ends of the outlet to the feed end. Since the entire outlet is on the same plane, the flow path of the adhesive in the center is shorter, while the path at the edges is longer. This causes the adhesive in the center to flow out preferentially and accumulate more during the initial and final stages of spraying, while the adhesive at the edges is insufficiently covered due to flow lag. Ultimately, this results in an uneven adhesive strip thickness, with the middle being too thick and the ends too thin, making it difficult to meet the process parameter requirements for complex curved surfaces and narrow spaces.

[0005] Furthermore, LASD damping adhesive is highly corrosive and has high flow friction. Existing nozzles mostly use a single stainless steel structure, which provides initial corrosion resistance, but its surface hardness is insufficient to withstand long-term friction and wear under the pressure of the metering machine (up to 25 MPa). Under high pressure, the nozzle outlet is prone to localized wear, leading to deviations in the adhesive flow path and distortion of the outlet shape, which in turn causes fluctuations in adhesive strip thickness or even coating failure. Frequent nozzle replacements not only increase production costs but also severely reduce coating efficiency, making it difficult to meet the stability requirements of automated production lines. Summary of the Invention

[0006] In view of the shortcomings or deficiencies mentioned in the background technology, the present application provides a nozzle and adhesive spraying device for automotive body painting, which can optimize the flow path of the adhesive in the nozzle, so that the travel of the adhesive strip sprayed from any position of the outlet tends to be consistent, and the thickness of the sprayed adhesive strip meets the process requirements.

[0007] In a first aspect, embodiments of this application provide a nozzle for painting automobile bodies, comprising:

[0008] The nozzle body has a fan-shaped diffusion cavity inside. One end of the nozzle body has a feed channel that communicates with the small end of the fan-shaped diffusion cavity, and the other end has a discharge port that communicates with the large end of the fan-shaped diffusion cavity. The discharge port is an arc-shaped slit and has the same curvature as the large end of the fan-shaped diffusion cavity. The symmetry plane of the discharge port coincides with the symmetry plane of the fan-shaped diffusion cavity.

[0009] In some embodiments, the end of the fan-shaped diffusion cavity away from the feed channel is an arc-shaped fan surface, the arc-shaped fan surface is inclined in the direction away from the feed channel, the feed channel faces the concave surface of the arc-shaped fan surface, and the discharge port is located at the end of the arc-shaped fan surface away from the feed channel.

[0010] In some embodiments, the end of the fan-shaped diffusion cavity connected to the feed channel is a plane, the central axis of the feed channel is located on the symmetry plane of the fan-shaped diffusion cavity and is perpendicular to the plane, and the central axis of the feed channel is located close to the arc-shaped fan surface.

[0011] In a first aspect, in some embodiments, the nozzle body includes a fan-shaped block and a cover plate connected to each other, the fan-shaped diffusion cavity is opened on one side of the fan-shaped block, the end of the fan-shaped block away from the feed channel is provided with an arc-shaped groove communicating with the fan-shaped diffusion cavity, and the cover plate is used to close the opening of the fan-shaped diffusion cavity and form the discharge port with the arc-shaped groove.

[0012] In some embodiments, the end of the fan-shaped block away from the feed channel is embedded with an arc-shaped block, the arc-shaped groove is formed on the arc-shaped block, the discharge port is formed between the arc-shaped block and the cover plate, and both the arc-shaped block and the cover plate are made of rigid wear-resistant material.

[0013] In some embodiments, the width of the discharge port gradually narrows from the middle of the discharge port towards both ends.

[0014] In some embodiments, the end of the sector block away from the arc groove is integrally provided with a connecting block, and the end of the connecting block away from the sector block is provided with a connection port communicating with the feeding channel; the diameter of the connection port is larger than the diameter of the feeding channel, and the inner wall of the connection port is provided with internal threads.

[0015] In some embodiments, the connecting block protrudes along the thickness direction of the sector block, and one end of the connecting block protruding from the sector block is provided with a positioning surface that contacts the end of the cover plate.

[0016] In some embodiments, the cover plate is provided with an assembly through hole, the sector block is provided with a threaded hole corresponding to the position of the assembly through hole, and the cover plate and the sector block are connected by bolts.

[0017] Secondly, embodiments of this application provide a glue spraying device for automotive body painting, comprising:

[0018] The spray gun and the nozzle for painting an automobile body as described in any of the preceding claims, wherein the nozzle is connected to the nozzle outlet of the spray gun.

[0019] The beneficial effects of the technical solution provided in this application include:

[0020] This application provides a nozzle and adhesive spraying device for automotive body painting. The nozzle body has a fan-shaped diffusion cavity inside. One end of the nozzle body has a feed channel that communicates with the small end of the fan-shaped diffusion cavity, and the other end has a discharge port that communicates with the large end of the fan-shaped diffusion cavity. The discharge port is an arc-shaped slit and has the same curvature as the large end of the fan-shaped diffusion cavity. The symmetry plane of the discharge port coincides with the symmetry plane of the fan-shaped diffusion cavity.

[0021] Therefore, when the colloid flows from the small end to the large end in the fan-shaped diffusion cavity, its flow path can unfold in a fan shape, which can effectively buffer and disperse the difference in colloid flow velocity, so that the colloid forms a uniform flow field distribution in the outlet area. At the same time, the arc-shaped slit outlet has the same curvature as the large end of the fan-shaped diffusion cavity, and the symmetry plane of the outlet coincides with the symmetry plane of the fan-shaped diffusion cavity. This can ensure that the flow direction of the colloid at the slit outlet matches the unfolding direction of the fan-shaped diffusion cavity, thereby reducing the accumulation or turbulence of colloid at the edge of the outlet, making the stroke of the colloid strip sprayed at any position of the outlet tend to be consistent, and the thickness uniform to meet the process requirements. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the nozzle body according to an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of the sector block in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the nozzle body from another perspective, representing an embodiment of this application.

[0026] Figure 4 This is a schematic diagram of the structure of a sector block according to another embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the nozzle body according to another embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the cover plate in an embodiment of this application.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Nozzle body; 11. Fan-shaped block; 111. Threaded hole; 12. Cover plate; 121. Assembly through hole; 13. Connecting block; 131. Positioning surface; 2. Fan-shaped diffuser cavity; 21. Arc-shaped fan surface; 22. Plane; 3. Feed channel; 4. Discharge port; 5. Arc-shaped groove; 6. Arc-shaped block; 7. Connection port. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] In view of the shortcomings or deficiencies mentioned in the background technology, the present application provides a nozzle and adhesive spraying device for automotive body painting, which can optimize the flow path of the adhesive in the nozzle, so that the travel of the adhesive strip sprayed from any position of the outlet tends to be consistent, and the thickness of the sprayed adhesive strip meets the process requirements.

[0033] See Figures 1 to 6 As shown, a first aspect of this application provides a nozzle for painting automobile bodies, comprising:

[0034] The nozzle body 1 has a fan-shaped diffuser cavity 2 inside. One end of the nozzle body 1 has a feed channel 3 that communicates with the small end of the fan-shaped diffuser cavity 2, and the other end has a discharge port 4 that communicates with the large end of the fan-shaped diffuser cavity 2. The discharge port 4 is an arc-shaped slit and has the same curvature as the large end of the fan-shaped diffuser cavity 2. The symmetry plane of the discharge port 4 coincides with the symmetry plane of the fan-shaped diffuser cavity 2.

[0035] In this embodiment, the nozzle body 1 is provided with a fan-shaped diffusion cavity 2. When the colloid flows from the small end to the large end in the fan-shaped diffusion cavity 2, its flow path unfolds in a fan shape, which can effectively buffer and disperse the difference in colloid flow rate, so that the colloid forms a uniform flow field distribution in the outlet 4 area.

[0036] Meanwhile, the arc-shaped slit outlet 4 has the same curvature as the large end of the fan-shaped diffuser 2, and the symmetry plane of the outlet 4 coincides with the symmetry plane of the fan-shaped diffuser 2, ensuring that the flow direction of the colloid at the slit outlet matches the expansion direction of the fan-shaped diffuser 2, thereby reducing the accumulation or turbulence of the colloid at the edge of the outlet 4, making the travel of the colloid strip sprayed from any position of the outlet 4 tend to be consistent, and the thickness uniform to meet the process requirements.

[0037] Firstly, in some alternative embodiments: see Figures 1 to 6 As shown, this application embodiment provides a nozzle for painting automobile bodies. The fan-shaped diffusion cavity 2 of the nozzle for painting automobile bodies has an arc-shaped fan surface 21 at the end away from the feed channel 3. The arc-shaped fan surface 21 is inclined in the direction away from the feed channel 3. The feed channel 3 faces the concave surface of the arc-shaped fan surface 21. The discharge port 4 is located at the end of the arc-shaped fan surface 21 away from the feed channel 3.

[0038] The fan-shaped diffusion cavity 2 of this application embodiment is provided with an arc-shaped fan surface 21 and the arc-shaped fan surface 21 of the fan-shaped diffusion cavity 2 is inclined so that the colloid forms a natural guide along the arc concave direction when flowing in the diffusion cavity, thereby reducing flow resistance and avoiding local retention of colloid in the fan-shaped diffusion cavity 2.

[0039] Meanwhile, the inclined arc-shaped fan surface 21 forms an angle with the central axis of the feed channel 3, which can further optimize the transition of the colloid from the feed channel 3 to the fan-shaped diffusion cavity 2, ensuring that the colloid is evenly distributed in the diffusion cavity, and finally sprayed out through the discharge port 4 to form a colloid strip of uniform thickness.

[0040] Firstly, in some alternative embodiments: see Figures 1 to 6As shown, this application embodiment provides a nozzle for painting automobile bodies. The fan-shaped diffuser cavity 2 of the nozzle for painting automobile bodies is connected to a feed channel 3 at one end, which is a plane 22. The central axis of the feed channel 3 is located on the symmetry plane of the fan-shaped diffuser cavity 2 and is perpendicular to the plane 22. The central axis of the feed channel 3 is located close to the arc-shaped fan surface 21.

[0041] In this embodiment, the central axis of the feeding channel 3 is located on the symmetry plane of the fan-shaped diffusion cavity 2 and perpendicular to the plane 22 of the fan-shaped diffusion cavity 2. The central axis of the feeding channel 3 is also located close to the arc-shaped fan surface 21, so that when the colloid enters the fan-shaped diffusion cavity 2, it can preferentially and quickly impact the concave area of ​​the arc-shaped fan surface 21, fully relying on the arc-shaped fan surface 21 to guide the colloid, so that the colloid diffuses evenly from one end of the arc-shaped fan surface 21 to the outlet 4 at the other end.

[0042] The design that the central axis of the feed channel 3 is located on the symmetrical plane of the fan-shaped diffusion cavity 2 can also guide the colloid to form a symmetrical flow trend in the fan-shaped diffusion cavity 2, avoid local accumulation or uneven flow of the colloid due to deviation of the feed direction, and thus ensure the consistency of the colloid's stroke at each position of the outlet 4.

[0043] Firstly, in some alternative embodiments: see Figures 1 to 6 As shown, this application embodiment provides a nozzle for painting automobile bodies. The nozzle body 1 of the nozzle for painting automobile bodies includes a fan-shaped block 11 and a cover plate 12 connected to each other. The fan-shaped diffusion cavity 2 is opened on one side of the fan-shaped surface of the fan-shaped block 11. An arc-shaped groove 5 communicating with the fan-shaped diffusion cavity 2 is opened at one end of the fan-shaped block 11 away from the feed channel 3. The cover plate 12 is used to close the opening of the fan-shaped diffusion cavity 2 and form a discharge port 4 with the arc-shaped groove 5.

[0044] In this embodiment, the nozzle body 1 is divided into a combination structure of a fan-shaped block 11 and a cover plate 12. The fan-shaped diffusion cavity 2 is opened on the fan-shaped surface of the fan-shaped block 11, and the cover plate 12 closes the opening of the fan-shaped diffusion cavity 2 and cooperates with the arc-shaped groove 5 to form the discharge port 4.

[0045] The modular design facilitates processing and assembly. At the same time, the geometry of the discharge port 4 (such as width and curvature) can be flexibly adjusted through the cooperation of the arc groove 5 and the cover plate 12 to adapt to the requirements of different spraying processes for the thickness and coverage of the adhesive strip.

[0046] Firstly, in some alternative embodiments: see Figures 1 to 6 As shown, this application embodiment provides a nozzle for painting automobile bodies. The fan-shaped block 11 of the nozzle for painting automobile bodies has an arc-shaped block 6 embedded at one end away from the feed channel 3. An arc-shaped groove 5 is opened on the arc-shaped block 6. An outlet 4 is formed between the arc-shaped block 6 and the cover plate 12. Both the arc-shaped block 6 and the cover plate 12 are made of rigid wear-resistant materials.

[0047] This embodiment of the application significantly improves the wear resistance of the outlet 4 area by embedding an arc-shaped block 6 on the fan-shaped block 11 and making the arc-shaped block 6 and the cover plate 12 together with a rigid wear-resistant material. Since the colloid flows at high speed during the spraying process and may carry particulate matter, this design can avoid structural deformation or dimensional deviation of the outlet 4 due to wear, thereby maintaining the stability of the colloid thickness over a long period of time, reducing the maintenance frequency and extending the service life of the nozzle.

[0048] For example, the rigid wear-resistant material can be tungsten carbide, ceramic, or high-hardness alloy, embedded in the fan-shaped block 11, and fixedly connected by welding or bonding. In this embodiment, the end of the fan-shaped block 11 is provided with a connecting block 13, and the connecting block 13 has a connecting port 7 that connects to the feed channel 3. The fan-shaped block 11 and the connecting block 13 are made of copper as a whole, which has strong plasticity and facilitates the processing of the fan-shaped diffusion cavity 2 and the connecting port 7. The cover plate 12 and the arc-shaped block 6 are both made of ultra-high hardness tungsten carbide material, which can improve the wear resistance and corrosion resistance of the discharge port 4.

[0049] Firstly, in some alternative embodiments: see Figures 1 to 6 As shown, this application embodiment provides a nozzle for painting automobile bodies, wherein the width of the outlet 4 of the nozzle for painting automobile bodies gradually narrows from the middle of the outlet 4 to both ends.

[0050] In this embodiment, the width of the outlet 4 is set to gradually narrow from the middle to both ends, so that the sprayed adhesive strip can form a long strip of adhesive that is thick in the middle and thin at both ends. Since the thinner sides are more conducive to water evaporation, water is prevented from forming air bubbles inside the adhesive.

[0051] For example, the arc range of the fan-shaped diffuser cavity 2 corresponds to an angle range of 100° to 120°, the width of the outlet 4 in the middle is 0.8mm, smoothly transitioning from the middle to both ends, and the thickness at both ends is 0.4mm. This allows for the spraying of a glue type that is thicker in the middle and thinner at both ends, reducing the amount of LASD glue used, meeting lightweight considerations, while still satisfying the LASD's shock resistance requirements. Optimizing the LASD glue thickness can reduce the amount used by 20%.

[0052] Firstly, in some alternative embodiments: see Figures 1 to 6 As shown, this application embodiment provides a nozzle for painting automobile bodies. The fan-shaped block 11 of the nozzle for painting automobile bodies has a connecting block 13 integrally provided at one end away from the arc groove 5. The connecting block 13 has a connecting port 7 communicating with the feed channel 3 at one end away from the fan-shaped block 11. The diameter of the connecting port 7 is larger than the diameter of the feed channel 3, and the inner wall of the connecting port 7 is provided with internal threads.

[0053] This embodiment of the application achieves a quick threaded connection between the nozzle and the spray gun by integrally setting a connecting block 13 on the sector block 11 and configuring a connecting port 7 with internal threads. The diameter of the connecting port 7 is larger than the diameter of the feed channel 3, which facilitates setting the spray gun to have an outlet with the same diameter as the feed channel 3. After the outlet and the feed channel 3 are aligned, the flow resistance of the adhesive at the connection can be effectively reduced. At the same time, the internal thread design ensures the connection is sealed, avoiding adhesive leakage or blockage, thereby improving spraying efficiency and process reliability.

[0054] Firstly, in some alternative embodiments: see Figures 1 to 6 As shown, this application embodiment provides a nozzle for painting automobile bodies. The connecting block 13 of the nozzle for painting automobile bodies protrudes along the thickness direction of the fan-shaped block 11, and the end of the connecting block 13 protruding from the fan-shaped block 11 is provided with a positioning surface 131 that contacts the end of the cover plate 12.

[0055] In this embodiment, by protruding the connecting block 13 along the thickness direction and providing a positioning surface 131, a stable assembly positioning can be formed when the connecting block 13 contacts the end of the cover plate 12. This design can prevent the cover plate 12 from shifting due to vibration or pressure during use, ensuring that the communication between the discharge port 4 and the fan-shaped diffuser cavity 2 is always in the designed state, and further maintaining the uniformity of the adhesive strip thickness.

[0056] Firstly, in some alternative embodiments: see Figures 1 to 6 As shown, this application embodiment provides a nozzle for painting automobile bodies. The cover plate 12 of the nozzle for painting automobile bodies is provided with an assembly through hole 121, and the sector block 11 is provided with a threaded hole 111 corresponding to the position of the assembly through hole 121. The cover plate 12 and the sector block 11 are connected by bolts.

[0057] This embodiment of the application achieves a detachable structure design for the nozzle body 1 by providing mounting through holes 121 and threaded holes 111 on the cover plate 12 and the sector block 11 respectively, and connecting them with bolts. This design facilitates later maintenance or replacement of worn parts (such as the cover plate 12 or the arc block 6), while the positioning accuracy of the threaded hole 111 ensures the geometric consistency of the discharge port 4 after assembly, avoiding fluctuations in spraying quality caused by assembly errors.

[0058] See Figures 1 to 6 As shown, a second aspect of this application provides a glue spraying device for automotive body painting, comprising:

[0059] The spray gun and the nozzle for painting automobile bodies according to any of the above embodiments are connected to the nozzle outlet of the spray gun.

[0060] The adhesive spraying device of this embodiment integrates the aforementioned nozzles, enabling efficient and uniform adhesive strip coverage in automotive body painting, particularly suitable for painting complex curved surfaces or narrow spaces. Specifically, the nozzles are fixedly connected to the adhesive outlet of the spray gun, aligning the adhesive output direction of the spray gun with the central axis of the nozzle's feed channel 3. The adhesive enters the nozzle from the spray gun, diffuses through the fan-shaped diffusion chamber 2, and is then discharged from the arc-shaped slit outlet 4. The adhesive strip sprayed from any position at the outlet 4 exhibits a consistent stroke and uniform thickness, meeting process requirements.

[0061] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0062] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0063] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A nozzle for painting automobile bodies, characterized in that, include: The nozzle body (1) has a fan-shaped diffuser cavity (2) inside. One end of the nozzle body (1) has a feed channel (3) that communicates with the small end of the fan-shaped diffuser cavity (2), and the other end has a discharge port (4) that communicates with the large end of the fan-shaped diffuser cavity (2). The discharge port (4) is an arc-shaped slit and has the same curvature as the large end of the fan-shaped diffuser cavity (2). The symmetry plane of the discharge port (4) coincides with the symmetry plane of the fan-shaped diffuser cavity (2).

2. The nozzle for automotive body painting as described in claim 1, characterized in that: The end of the fan-shaped diffusion cavity (2) away from the feed channel (3) is an arc-shaped fan surface (21). The arc-shaped fan surface (21) is inclined in the direction away from the feed channel (3). The feed channel (3) faces the concave surface of the arc-shaped fan surface (21). The discharge port (4) is located at the end of the arc-shaped fan surface (21) away from the feed channel (3).

3. The nozzle for automotive body painting as described in claim 2, characterized in that: The fan-shaped diffusion cavity (2) is connected to the feed channel (3) at one end as a plane (22). The central axis of the feed channel (3) is located on the symmetry plane of the fan-shaped diffusion cavity (2) and is perpendicular to the plane (22). The central axis of the feed channel (3) is located close to the arc-shaped fan surface (21).

4. The nozzle for painting automobile bodies as described in any one of claims 1 to 3, characterized in that: The nozzle body (1) includes a fan-shaped block (11) and a cover plate (12) connected to each other. The fan-shaped diffuser cavity (2) is opened on one side of the fan-shaped block (11). The fan-shaped block (11) has an arc-shaped groove (5) that communicates with the fan-shaped diffuser cavity (2) at one end away from the feed channel (3). The cover plate (12) is used to close the opening of the fan-shaped diffuser cavity (2) and form the discharge port (4) with the arc-shaped groove (5).

5. The nozzle for automotive body painting as described in claim 4, characterized in that: An arc-shaped block (6) is embedded at one end of the sector block (11) away from the feed channel (3). An arc-shaped groove (5) is opened on the arc-shaped block (6). The discharge port (4) is formed between the arc-shaped block (6) and the cover plate (12). Both the arc-shaped block (6) and the cover plate (12) are made of rigid wear-resistant material.

6. The nozzle for automotive body painting as described in claim 4, characterized in that: The width of the discharge port (4) gradually narrows from the middle to both ends.

7. The nozzle for automotive body painting as described in claim 4, characterized in that: The sector block (11) is integrally provided with a connecting block (13) at one end away from the arc groove (5), and the connecting block (13) is provided with a connecting port (7) communicating with the feeding channel (3) at one end away from the sector block (11); the diameter of the connecting port (7) is larger than the diameter of the feeding channel (3), and the inner wall of the connecting port (7) is provided with an internal thread.

8. The nozzle for automotive body painting as described in claim 7, characterized in that: The connecting block (13) protrudes along the thickness direction of the fan-shaped block (11), and the end of the connecting block (13) protruding from the fan-shaped block (11) is provided with a positioning surface (131) that contacts the end of the cover plate (12).

9. The nozzle for automotive body painting as described in claim 4, characterized in that: The cover plate (12) is provided with an assembly through hole (121), and the sector block (11) is provided with a threaded hole (111) corresponding to the position of the assembly through hole (121). The cover plate (12) and the sector block (11) are connected by bolts.

10. A glue spraying device for automobile body painting, characterized in that, include: The spray gun and the nozzle for painting an automobile body as described in any one of claims 1 to 9, wherein the nozzle is connected to the nozzle outlet of the spray gun.

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