Powder coating system for aluminum nitride ceramic green body

Abstract

The utility model discloses a powder coating system for aluminum nitride ceramic green bodies, which comprises a conveyor belt, an inductor, a dust collecting device, a powder coating device and a green body drying box are sequentially arranged from right to left along the working direction of the conveyor belt, and when the powder coating device works, a medium in a pneumatic stirring tank reaches a spray head through a main pipeline and a branch pipeline; the nozzle comprises a shell and a valve body, and the valve body is arranged in the shell; a limiting bracket is fixedly arranged on the valve body; a limiting support is fixedly arranged on the valve body, a liquid inlet channel is formed in the limiting support, and a liquid spraying column matched with the liquid inlet channel is rotationally arranged in the liquid inlet channel. Rotating blades are fixedly arranged on the outer wall of the liquid spraying column; the valve body is further provided with an air inlet channel. In the process that airflow enters the valve body through the air inlet channel in the upper end of the valve body and is sprayed out of the air outlet channel in the lower end of the valve body, the airflow acts on the rotating blades and drives the liquid spraying column to rotate, and the centrifugal force of medium liquid in the liquid spraying column is improved. The problems that in the prior art, the powder coating effect is not ideal, the environment is polluted, and partial areas of a conveying belt are difficult to clean are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of powder coating, in particular to a powder coating system for aluminum nitride ceramic green bodies. Background Art

[0002] Aluminum nitride substrates require stacking several tape-cast green sheets, debinding, and sintering. However, in order to prevent the upper and lower green sheets from sticking together due to melting during sintering, a layer of isolation powder must be attached in the middle. This layer of powder is required to be thin and evenly distributed on the entire substrate surface. If it is uneven, the unattached areas are prone to adhesion, and pits are formed on the ceramic surface due to thickness differences, affecting the surface state of the ceramic.

[0003] The spraying method is to disperse the isolation powder in the solvent, atomize it with gas and then spray it out. The parameters and layout of the nozzle have a decisive influence on the uniformity of the isolation powder on the surface of the ceramic green body. The commonly used nozzle moves left and right on the conveyor belt, and has very high requirements on the matching of the movement speed and the green body conveying speed, the movement amplitude, the spraying pressure and other parameters. Otherwise, it will cause uneven spraying, and it is easy to blow the green body, resulting in position disorder and overlap.

[0004] When the atomization effect is not ideal, the sprayed media distribution may be uneven, resulting in inconsistent surface treatment quality of the product; in addition, uneven atomization may lead to material waste during the spraying process, overflow or excessive deposition beyond the target area will increase material costs and require additional cleanup. Of course, the atomization effect of the nozzle directly affects the appearance and performance of the final product. Uneven coating may cause product surface roughness, insufficient strength or appearance defects, affecting the market performance of the product.

[0005] In addition, the atomized isolation powder sprayed at high speed has fine particles, which will affect the health of employees if inhaled. At the same time, the isolation powder adheres to the area of ​​the conveyor belt where the green pieces are not placed, making it difficult to clean. Utility Model Content

[0006] The utility model aims to solve or alleviate the above problems, especially to solve the problem that the atomization effect of the existing nozzle is not ideal, and proposes a powder coating system for aluminum nitride ceramic green body.

[0007] The utility model is realized by the following technical solutions:

[0008] A powder coating system for aluminum nitride ceramic green body, comprising a conveyor belt, along the working direction of the conveyor belt, from right to left, a sensor, a dust collecting device, a powder coating device, and a green body drying box are arranged in sequence, the powder coating device comprises a pneumatic stirring tank, a main pipeline, a branch pipeline and a nozzle; when the powder coating device is working, the medium in the pneumatic stirring tank reaches the nozzle via the main pipeline and the branch pipeline; the nozzle comprises a shell and a valve body, and the valve body is arranged in the shell; a limit bracket is fixedly provided on the valve body, a limit bracket is fixedly provided on the valve body, a liquid inlet is provided on the limit bracket, and a liquid spray column matching the liquid inlet is rotatably arranged in the liquid inlet; a rotating blade is fixedly provided on the outer wall of the liquid spray column; an air inlet is also provided on the valve body along the axial direction of the valve body; in the process of airflow entering the valve body through the air inlet at the upper end of the valve body and spraying out from the air outlet at the lower end of the valve body, the airflow acts on the rotating blade and drives the liquid spray column to rotate, thereby increasing the centrifugal force of the liquid in the liquid spray column.

[0009] In the prior art, for the powder coating system of aluminum nitride ceramic green bodies, if the atomization effect of the nozzle is insufficient, the powder will be unevenly distributed on the surface of the aluminum nitride ceramic green body. This uneven coverage may cause surface defects such as cracks, pores and uneven surfaces in the green body during the sintering process, affecting the appearance and structural strength of the final product. In addition, poor atomization effect may require repeated powder spraying process in an attempt to obtain uniform coverage, which not only increases production time but also reduces overall production efficiency. Finally, uneven powder coating may lead to excessive use of powder material to compensate for uneven areas, thereby increasing material costs. In addition, uneven coverage may need to be compensated by increasing sintering time or temperature, which further increases energy consumption.

[0010] In the technical solution of the utility model, the centrifugal force of the internal liquid is enhanced by the rotation of the spray column, which helps to produce finer and more uniform droplets, which is crucial to ensure the consistency and uniformity of the surface coating of the green body, and can significantly improve the surface quality of the sintered product. The use of airflow to simultaneously drive the rotation and promote atomization can reduce the need for additional energy, such as no need for additional mechanical or electrical equipment to achieve the rotation of the spray column, thereby reducing energy consumption. A more efficient atomization process means that the amount of liquid can be controlled more accurately, reducing overspray and material waste. This is not only economical and efficient, but also meets environmental protection requirements. Since airflow is used as the main power and atomization source, the mechanical structure of the nozzle is simplified, the risk of mechanical failure is reduced, and the maintenance procedure is simplified, reducing downtime caused by blockage.

[0011] Preferably, the powder coating device is arranged in a dust collecting device, and the dust collecting device includes an upper cover, a dust collecting cover, a powder filter box and a fan. The upper cover and the dust collecting cover are arranged above and below the conveyor belt respectively; the powder filter box is arranged below the dust collecting cover and connected to one end of the air duct, and the other end of the air duct is provided with a fan. The design of the dust collecting device effectively collects and recycles the excess isolation powder generated during the powder coating process, reduces the environmental pollution of dust, and optimizes the air quality in the workplace.

[0012] Preferably, it also includes a conveyor belt cleaning device arranged below the conveyor belt; perpendicular to the working direction of the conveyor belt, the conveyor belt cleaning device includes a roller brush and a flux tank arranged from top to bottom; the flux tank is fixedly connected to the conveyor belt frame; the roller brush is a cylinder and is movably connected to part of the flux tank, the axial direction of the roller brush is perpendicular to the working direction of the conveyor belt, and the roller brush contacts the outer wall of the conveyor belt. The conveyor belt passes through the cleaning device before returning, and the roller brush evenly applies the solvent to the surface of the conveyor belt when it rotates, dissolving and removing the powder. Then, the drying box dries the treated area to ensure that the conveyor belt is dry and returns to the starting position.

[0013] Preferably, a conveyor belt drying box fixedly connected to the conveyor belt frame is provided on the right side of the conveyor belt cleaning device, and the conveyor belt drying box is used to dry the residual liquid after the roller brush cleans the outer wall of the conveyor belt. The provision of the conveyor belt drying box ensures that the conveyor belt is thoroughly dried before returning to the production line, and prevents the isolation powder from adhering again due to the wetting of the conveyor belt, thereby improving the continuity of production and the consistency of product quality.

[0014] Preferably, a disperser coaxial with the spray column is further provided at the lower end of the spray column. The disperser is a hollow structure and a plurality of circular openings arranged in a matrix are provided on the outer wall of the disperser along the circumferential direction of the disperser. When the spray column rotates, the disperser evenly disperses the isolation powder through the openings in the circumferential direction thereof, and utilizes the centrifugal force brought by the rotation to evenly spray the isolation powder with finer particle size on the passing green body.

[0015] Preferably, the sensor is arranged on the conveyor frame and on both sides of the conveyor in the working direction. The sensor activates or stops the relevant equipment of the powder coating system by detecting the presence of the green blank, ensuring that each green blank can be properly processed at the right time.

[0016] Preferably, the outer wall of the upper cover is provided with a glass observation port and a detachable maintenance plate. During the powder spraying operation, the working state of the spray head and the distribution of the powder can be directly observed through the glass observation port.

[0017] Preferably, there are several branch pipes, which are arranged in a straight line, and the straight line formed by the branch pipes is perpendicular to the working direction of the conveyor belt. When the green body passes through the conveyor belt, the branch pipes arranged in a straight line can ensure that the isolation powder is evenly sprayed along the width of the conveyor belt, thereby avoiding the surface quality problem of the green body caused by uneven powder spraying.

[0018] Preferably, a fixing screw is provided on the outer wall of the shell of the nozzle, and a nozzle bracket is provided on the fixing screw, and the nozzle bracket connects and fixes each nozzle. The nozzle is firmly fixed in its operating position by the fixing screw and the nozzle bracket, and can remain stable even if vibration or slight impact occurs during the operation of the equipment, thereby ensuring the quality and uniformity of powder spraying.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0020] 1. The nozzle of the utility model is provided with a liquid spray column inside, and a rotating blade is fixed on the outer wall of the liquid spray column. When the airflow enters from the air inlet, it first impacts the rotating blade, so that the rotating blade drives the liquid spray column to rotate. During the rotation process, the liquid in the liquid spray column will also rotate, increasing its own centrifugal force. When the liquid is sprayed from the nozzle, the centrifugal force makes the liquid spray range larger. In addition, the airflow can also impact the sprayed liquid to atomize it. The airflow not only achieves the effect of increasing the centrifugal force of the liquid, but also strengthens the effect of impact atomization. In addition, the airflow is also transformed into a vortex airflow after passing through the rotating blades, further increasing the range of atomization spraying. The above three effects are superimposed, so that the atomization effect of the nozzle is optimal.

[0021] 2. The utility model is also provided with a dust collecting device, in which the powder coating device is arranged. The dust collecting device is composed of an upper cover and a dust collecting hood, wherein the upper cover is located above the conveyor belt and is provided with a transparent observation window, and the dust collecting hood is located below and corresponds thereto. The dust collecting hood is connected to the powder filter box, which is connected to the air duct and the fan, and the fan helps to extract the dust in the powder filter box and send it to the dust removal tower. The design of the dust collecting device effectively collects and recycles the excess isolation powder generated during the powder coating process, reduces the environmental pollution of dust, and optimizes the air quality in the workplace.

[0022] 3. The utility model also includes a conveyor belt cleaning device located below the conveyor belt, including a vertically arranged roller brush and a solvent tank. The roller brush is fixed to the solvent tank, in contact with the outer wall of the conveyor belt, and drives the solvent to clean the conveyor belt when rotating. The conveyor belt cleaning device effectively removes residual isolation powder on the conveyor belt, maintains the cleanliness of the production line, prevents isolation powder from accumulating in the uncoated conveyor belt area, and improves production efficiency and product quality.

[0023] 4. The utility model adds a conveyor belt drying box on the right side of the cleaning device. This drying box is fixedly connected to the conveyor belt frame and is used to dry the surface of the cleaned conveyor belt to remove residual solvents and moisture. The setting of the conveyor belt drying box ensures that the conveyor belt is thoroughly dried before returning to the production line, preventing the isolation powder from adhering again due to the wet conveyor belt, thereby improving the continuity of production and the consistency of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model.

[0025] In the attached picture:

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0027] Figure 2 This is a schematic diagram of the nozzle structure of the utility model;

[0028] Figure 3 This is a cross-sectional view of the nozzle structure of the utility model;

[0029] Figure 4 It is a schematic diagram of the structure of the powder applying device of the present utility model.

[0030] The reference numerals represent:

[0031] 1. conveyor belt; 2. sensor; 3. upper cover; 4. nozzle; 41. shell; 42. valve body; 43. limit bracket; 44. spray column; 45. rotating blade; 46. disperser; 461. opening; 47. air inlet; 48. liquid inlet; 49. fixing screw; 5. green body drying box; 6. dust collecting hood; 7. powder filter box; 8. fan; 9. roller brush; 10. solvent tank; 11. conveyor belt drying box; 12. pneumatic stirring tank; 13. main pipeline; 14. branch pipeline; 15. nozzle bracket. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. The schematic implementation mode of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model. It should be noted that the utility model is already in the actual research and development and use stage.

[0033] Unless otherwise defined, the technical terms or scientific terms used in this utility model shall have the usual meanings understood by people with ordinary skills in the field to which this utility model belongs. The words "first", "second" and similar words used in this utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. The words "include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0034] In the process of manufacturing aluminum nitride substrates, several substrate tape-cast green bodies need to be stacked and sintered. In order to prevent the green bodies from sticking together due to melting, a thin layer of isolation powder needs to be evenly coated between them. The uniform coating of isolation powder is crucial to the quality of the ceramic surface; if the coating is uneven, it will cause the green bodies to stick together and pits to appear on the ceramic surface. Conventional nozzles disperse isolation powder in a solvent and atomize it with gas before spraying. The parameters and layout of the nozzles play a decisive role in the uniform distribution of isolation powder, including the movement speed, movement amplitude and injection pressure of the nozzles. Uneven atomization will lead to inconsistent product surface treatment quality, increase material costs, and require additional cleaning work. In addition, uneven coating may cause rough surface or appearance defects of the product, affecting market performance. The high-speed spraying of atomized powder is not only difficult to clean, but may also pose a threat to the health of operators.

[0035] Embodiment 1:

[0036] Please refer to the attached Figure 1 -Attached Figure 4 As shown, a powder coating system for aluminum nitride ceramic green body comprises a conveyor belt 1. Along the working direction of the conveyor belt 1, a sensor 2, a dust collecting device, a powder coating device, and a green body drying box 5 are arranged from right to left in sequence. The powder coating device comprises a pneumatic stirring tank 12, a main pipeline 13, a branch pipeline 14, and a nozzle 4. When the powder coating device is working, the medium in the pneumatic stirring tank 12 reaches the nozzle 4 via the main pipeline 13 and the branch pipeline 14. The nozzle 4 comprises a shell 41 and a valve body 42. The valve body 42 is arranged in the shell. A fixed valve 41 is arranged on the valve body 42. A limiting bracket 43 is provided, on which a liquid inlet 48 is provided, in which a liquid spray column 44 matching the liquid inlet 48 is rotatably provided; a rotating blade 45 is fixedly provided on the outer wall of the liquid spray column 44; along the axial direction of the valve body 42, an air inlet 47 is also provided on the valve body 42; in the process of air flow entering the valve body 42 through the air inlet 47 at the upper end of the valve body 42 and being ejected from the air outlet at the lower end of the valve body 42, the air flow acts on the rotating blade 45 and drives the liquid spray column 44 to rotate, thereby increasing the centrifugal force of the liquid in the liquid spray column 44.

[0037] It should be noted that the nozzle 4 of the powder coating device is designed as a dynamically adjustable component, and its structure includes a valve body 42 fixed in a housing 41, and a limit bracket 43 is axially provided on the valve body 42, and a liquid inlet 48 is provided on the limit bracket 43. A rotatable liquid spray column 44 is installed in the liquid inlet 48, and a rotating blade 45 is fixed on the outer wall of the liquid spray column 44. The valve body 42 is also provided with an air inlet 47, and the airflow enters through the air inlet 47, driving the liquid spray column 44 to rotate, and the centrifugal force inside the liquid spray column 44 improves the spraying effect of the medium. The uniform distribution of the isolation powder in the powder coating process is effectively improved, and the adhesion problem between the green pieces is avoided. In addition, by accurately controlling the spray parameters, the uniform coating of the powder before the green pieces are dried is guaranteed, thereby improving the quality of the final product.

[0038] Working principle:

[0039] When the sensor 2 detects that the green body on the conveyor belt 1 passes through, the powder coating device is activated, and the pneumatic stirring tank 12 starts to work, mixing the isolation powder with the solvent and then transporting it to the nozzle 4 through the pipeline. The airflow is introduced through the air inlet 47 of the valve body 42, driving the rotating blades 45 and the spray column 44, and strengthening the powder coating process through centrifugal force. The airflow can not only increase the centrifugal force of the liquid in the spray column 44, so that the liquid can flow more efficiently, but also be thrown out at the nozzle to increase the diffusion area, and can also give impact when the liquid is sprayed, so that it is atomized, and an efficient and uniform atomization effect is achieved. In addition, because the airflow passes through the rotating blades 45, the airflow itself also changes its angle and becomes a rotating airflow, which further optimizes the atomization effect.

[0040] As a further preference of this embodiment, the powder coating device is arranged in the dust collecting device, and the dust collecting device includes an upper cover 3, a dust collecting cover 6, a powder filter box 7 and a fan 8. The upper cover 3 and the dust collecting cover 6 are respectively arranged above and below the conveyor belt 1; the powder filter box 7 is arranged below the dust collecting cover 6 and is connected to one end of the air duct, and a fan 8 is provided at the other end of the air duct.

[0041] It should be noted that the powder coating device is arranged in the dust collecting device, which is composed of an upper cover 3 and a dust collecting cover 6, wherein the upper cover 3 is located above the conveyor belt 1 and is equipped with a transparent observation window, and the dust collecting cover 6 is located below and corresponds to it. The dust collecting cover 6 is connected to the powder filter box 7, and the powder filter box 7 is connected to the air duct and the fan 8. The fan 8 helps to extract the dust in the powder filter box 7 and send it to the dust removal tower. The design of the dust collecting device effectively collects and recycles the excess isolation powder generated during the powder coating process, reduces the environmental pollution of dust, and optimizes the air quality in the workplace.

[0042] Working principle:

[0043] When applying powder, isolation powder may fly, and the dust collecting hood 6 captures the dust, and sends it to the powder filter box 7 for filtration through the suction force of the fan 8, and the clean air is discharged into the main network, and the powder is collected and reused.

[0044] There is a better implementation method of this embodiment, in which the sensor 2 is arranged on the frame of the conveyor belt 1 and is located on both sides of the working direction of the conveyor belt 1.

[0045] It should be noted that by installing the sensors 2 on both sides, it is possible to ensure that the green pieces entering the powder coating area are fully monitored, which improves the response speed and accuracy of the system, thereby optimizing the automation of the entire powder coating process. The sensors 2 activate or stop the relevant equipment of the powder coating system by detecting the presence of the green pieces, ensuring that each green piece can be properly processed at the right time. This automated control reduces manual intervention and improves production efficiency and product consistency.

[0046] As a further preference of this embodiment, it also includes a conveyor belt 1 cleaning device arranged below the conveyor belt 1; perpendicular to the working direction of the conveyor belt 1, the conveyor belt 1 cleaning device includes a roller brush 9 and a flux tank arranged from top to bottom; the flux tank is fixedly connected to the conveyor belt 1 frame; the roller brush 9 is a cylinder and is movably connected to a part of the flux tank, the axial direction of the roller brush 9 is perpendicular to the working direction of the conveyor belt 1, and the roller brush 9 is in contact with the outer wall of the conveyor belt 1.

[0047] It should be noted that the system also includes a conveyor belt 1 cleaning device located below the conveyor belt 1, including a vertically arranged roller brush 9 and a solvent tank 10. The roller brush 9 is fixed to the solvent tank 10, in contact with the outer wall of the conveyor belt 1, and drives the solvent to clean the conveyor belt 1 when it rotates. The conveyor belt 1 cleaning device effectively removes residual isolation powder on the conveyor belt 1, maintains the cleanliness of the production line, prevents isolation powder from accumulating in the uncoated area of ​​the conveyor belt 1, and improves production efficiency and product quality. The conveyor belt 1 passes through the cleaning device before returning, and the roller brush 9 evenly applies the solvent to the surface of the conveyor belt 1 when it rotates, dissolving and removing the powder. Then, the drying box dries the treated area to ensure that the conveyor belt 1 is dry and returns to the starting position.

[0048] In actual production, if the solvent has a poor effect on certain isolation powders, the cleaning solvent with different components can be replaced, or the material and density of the roller brush 9 can be adjusted to adapt to different types of powders and pollution levels.

[0049] This embodiment has a better solution. A conveyor belt drying box 11 fixedly connected to the conveyor belt 1 frame is provided on the right side of the conveyor belt 1 cleaning device. The conveyor belt drying box 11 is used to dry the residual liquid after the roller brush 9 cleans the outer wall of the conveyor belt 1.

[0050] It should be noted that the present solution further refines the design of the conveyor belt 1 cleaning device, in particular, a conveyor belt drying box 11 is added to the right side of the cleaning device. This drying box is fixedly connected to the conveyor belt 1 frame and is used to dry the surface of the cleaned conveyor belt 1 to remove residual solvent and moisture. The setting of the conveyor belt drying box 11 ensures that the conveyor belt 1 is thoroughly dried before returning to the production line, preventing the isolation powder from adhering again due to the wetting of the conveyor belt 1, thereby improving the continuity of production and the consistency of product quality.

[0051] Working principle:

[0052] After the conveyor belt 1 is cleaned by the roller brush 9 and the solvent tank 10, the residual isolation powder and solvent on the conveyor belt 1 are removed. After that, the conveyor belt 1 enters the drying box, where it is quickly dried by the heating element to ensure that the conveyor belt 1 is completely dry before returning to the starting position to prevent moisture from affecting the powder coating effect of the next green body.

[0053] This embodiment has a better solution. The lower end of the spray column 44 is provided with a disperser 46 coaxial with the spray column 44. The disperser 46 is a hollow structure and along the circumferential direction of the disperser 46, the outer wall of the disperser 46 is provided with a plurality of circular openings 461 arranged in a matrix.

[0054] It should be noted that the disperser 46 can more effectively control the spray distribution of the isolation powder, ensure uniform coverage of the isolation powder, improve the uniformity of the surface treatment of the green body, and thus improve the surface quality of the final product.

[0055] Working principle:

[0056] When the spray column 44 rotates, the disperser 46 evenly disperses the isolation powder through the openings 461 in its circumferential direction, and utilizes the centrifugal force brought by the rotation to evenly spray the isolation powder in a finer particle size on the passing green body, which helps to prevent the green body from sticking during the sintering process.

[0057] Embodiment 2:

[0058] As a further optimization of the above embodiment, the outer wall of the upper cover 3 is provided with a glass observation port and a detachable maintenance plate. During the powder spraying operation, the working state of the nozzle 4 and the distribution of the powder can be directly observed through the glass observation port to ensure uniform and correct powder spraying. When internal maintenance or adjustment is required, the maintenance plate can be easily removed to quickly inspect and clean the internal components without disassembling the entire dust collection device.

[0059] Please refer to the attached Figure 4As shown, there are several branch pipes, which are arranged in a straight line, and the straight line formed by the multiple branch pipes is perpendicular to the working direction of the conveyor belt 1. When the green body passes through the conveyor belt 1, the branch pipes arranged in a straight line can ensure that the isolation powder is evenly sprayed along the width of the conveyor belt 1, thereby avoiding the surface quality problem of the green body caused by uneven powder spraying. This configuration takes advantage of the straight-line spraying, so that each part of the green body can obtain sufficient powder coverage.

[0060] A fixing screw 49 is provided on the outer wall of the housing 41 of the nozzle 4, and a nozzle bracket 15 is provided on the fixing screw 49, and the nozzle bracket 15 connects and fixes each nozzle 4. The nozzle 4 is firmly fixed in its operating position by the fixing screw 49 and the nozzle bracket 15, and can remain stable even if vibration or slight impact occurs during the operation of the equipment, ensuring the quality and uniformity of powder spraying. This fixing method facilitates the precise adjustment of the nozzle 4 and the long-term maintenance of the set spray angle and position.

[0061] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them; although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present disclosure. The following points need to be explained: In the accompanying drawings of the embodiments of the present utility model, only the structures involved in the embodiments of the present utility model are involved, and other structures can refer to the usual design. In the absence of conflict, the features in the same embodiment and different embodiments of the present utility model can be combined with each other. The above is only an exemplary implementation of the present utility model, and is not used to limit the scope of protection of the present utility model. The scope of protection of the present utility model is determined by the attached claims.

Claims

1. A powder coating system for aluminum nitride ceramic green bodies, comprising a conveyor belt (1), wherein a sensor (2), a dust collecting device, a powder coating device, and a green body drying box (5) are arranged in sequence from right to left along the working direction of the conveyor belt (1), characterized in that: The powder coating device comprises a pneumatic stirring tank (12), a main pipeline (13), a branch pipeline (14) and a nozzle (4); when the powder coating device is in operation, the medium in the pneumatic stirring tank (12) reaches the nozzle (4) via the main pipeline (13) and the branch pipeline (14); The spray head (4) comprises a housing (41) and a valve body (42), wherein the valve body (42) is disposed in the housing (41); a limit bracket (43) is fixedly disposed on the valve body (42), a liquid inlet (48) is disposed on the limit bracket (43), a liquid spray column (44) matching the liquid inlet (48) is rotatably disposed in the liquid inlet (48); a rotating blade (45) is fixedly disposed on the outer wall of the liquid spray column (44); An air inlet (47) is also provided on the valve body (42) along the axial direction of the valve body (42); when the airflow enters the valve body (42) through the air inlet (47) at the upper end of the valve body (42) and is ejected from the air outlet at the lower end of the valve body (42), the airflow acts on the rotating blades (45) and drives the liquid spray column (44) to rotate, thereby increasing the centrifugal force of the liquid in the liquid spray column (44).

2. The powder coating system for aluminum nitride ceramic green body according to claim 1, characterized in that: The powder coating device is arranged in a dust collecting device, and the dust collecting device comprises an upper cover (3), a dust collecting cover (6), a powder filter box (7) and a fan (8). The upper cover (3) and the dust collecting cover (6) are arranged above and below the conveyor belt (1), respectively; the powder filter box (7) is arranged below the dust collecting cover (6) and is connected to one end of an air duct, and the other end of the air duct is provided with a fan (8).

3. A powder coating system for aluminum nitride ceramic green body according to claim 2, characterized in that: It also includes a conveyor belt (1) cleaning device disposed below the conveyor belt (1); perpendicular to the working direction of the conveyor belt (1), the conveyor belt (1) cleaning device includes a roller brush (9) and a flux tank disposed from top to bottom; the flux tank is fixedly connected to the conveyor belt (1) frame; the roller brush (9) is a cylinder and is movably connected to a portion of the flux tank, the axial direction of the roller brush (9) is perpendicular to the working direction of the conveyor belt (1), and the roller brush (9) is in contact with the outer wall of the conveyor belt (1).

4. A powder coating system for aluminum nitride ceramic green body according to claim 3, characterized in that: A conveyor belt drying box (11) fixedly connected to the conveyor belt (1) frame is also provided on the right side of the conveyor belt (1) cleaning device. The conveyor belt drying box (11) is used to dry the residual liquid after the roller brush (9) cleans the outer wall of the conveyor belt (1).

5. The powder coating system for aluminum nitride ceramic green body according to claim 4, characterized in that: A disperser (46) coaxial with the liquid spraying column (44) is also provided at the lower end of the liquid spraying column (44). The disperser (46) is of a hollow structure and along the circumferential direction of the disperser (46), the outer wall of the disperser (46) is provided with a plurality of circular openings (461) arranged in a matrix.

6. The powder coating system for aluminum nitride ceramic green body according to claim 1, characterized in that: The sensor (2) is arranged on the frame of the conveyor belt (1) and is located on both sides of the working direction of the conveyor belt (1).

7. The powder coating system for aluminum nitride ceramic green body according to claim 5, characterized in that: The outer wall of the upper cover (3) is provided with a glass observation port and a detachable maintenance plate.

8. The powder coating system for aluminum nitride ceramic green body according to claim 7, characterized in that: There are a plurality of branch pipes, which are arranged in a straight line, and the straight line formed by connecting the branch pipes is perpendicular to the working direction of the conveyor belt (1).

9. A powder coating system for aluminum nitride ceramic green body according to any one of claims 1 to 8, characterized in that: A fixing screw (49) is provided on the outer wall of the housing (41) of the nozzle (4), and a nozzle bracket (15) is provided on the fixing screw (49). The nozzle bracket (15) is connected to and fixes each nozzle (4).

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