Automatic curtain coating device and method for aerospace nuts

Abstract

The invention discloses an automatic curtain coating device and method for aerospace nuts, and belongs to the technical field of nut coating. The automatic shower coating device comprises a shower coating barrel, a coating barrel, a coating pump, a spraying gun, a charging basket and a basket driving mechanism, the shower coating barrel comprises a barrel body and a barrel cover, the coating barrel is connected with the coating pump through a feeding pipeline, the coating pump is connected with the spraying gun through a coating pipeline, and coating in the shower coating barrel can flow back into the coating barrel; the charging basket is arranged in the barrel body, under the action of the basket driving mechanism, the charging basket rotates to turn over the nut, and the spraying gun is arranged on the barrel cover and used for spraying paint to the nut. The nut is subjected to shower coating, compared with dip-coating, the required coating amount is small, the coating is saved and recycled, and the preparation amount and waste amount of the coating are further reduced; in the shower coating process of the spray gun, the nut is turned over under rotation of the charging basket, it is guaranteed that shower coating of the nut is in place, the problem that local coatings of the nut are accumulated is solved, and the uniformity of the coatings on the surface of the nut is improved.

Description

Technical Field

[0001] The invention relates to an automatic spray coating device and coating method for nuts used in aerospace, belonging to the technical field of nut coating. Background Art

[0002] In the aerospace field, due to the different environments in which the products are located and used, the surface treatment requirements for the nuts involved in the products are different. The nuts used must meet the requirements of the product's anti-corrosion and lubrication properties, so the nut surface needs to be coated.

[0003] At present, the coating on the surface of nuts is mostly applied by dipping first and then centrifuging. The nuts are placed in a dipping container for dipping and then placed in a centrifugal dryer for drying. The purpose of dipping is to ensure that the inner threads of the nut can be coated with the coating, and the purpose of centrifuging is to remove excess coating on the surface of the nut.

[0004] The main disadvantages of coating by dip coating and centrifugal coating are as follows: (1) The coating uniformity of dip coating and centrifugal coating is poor. During the centrifugal drying process after dip coating, the coating will be transferred to the centrifugal direction, which will cause the coating on the far end to be thicker, especially the internal thread will have paint accumulation on one side. Therefore, it is not suitable for nuts with high coating precision requirements, especially self-locking nuts and high-locking nuts for aerospace. The coating thickness directly affects the locking torque and preload. (2) More coating is required during the dip coating process. In order to ensure that the nut parts can be completely immersed in the dip coating, a large amount of coating is required. If the coating is expensive, the cost will be very high. If a two-component coating with an activation period requirement is used, it must be discarded after the activation period, which will result in greater waste.

[0005] Another way is spraying, but for batch nuts, ordinary spraying equipment is difficult to achieve full coverage of all positions of the nuts. Summary of the invention

[0006] Aiming at the deficiencies in the prior art, the present invention provides an automatic nut coating device and a nut coating method.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: an automatic spray coating device for nuts for aerospace, comprising a spray coating barrel, a paint barrel, a paint pump, a spray gun, a material basket and a basket driving mechanism, the spray coating barrel comprising a barrel body and a barrel cover, the paint barrel is connected to the paint pump through a feed pipeline, the paint pump is connected to the spray gun through a paint pipeline, and the excess paint of the spray coating barrel can flow back into the paint barrel;

[0008] The material basket is arranged in the barrel body, and the material basket is used to hold nuts. Under the action of the basket driving mechanism, the material basket can rotate to flip the nuts in the material basket. The spray gun is arranged on the barrel cover, and the spray gun is used to spray paint to the nuts in the material basket.

[0009] The beneficial effects of the present invention are as follows: a spray gun is used to coat the nuts in a material basket. Compared with dipping, spray coating requires less paint, which saves paint. Excess paint in the spray coating barrel can flow back into the paint barrel, and then the paint can be pumped to the spray gun under the pumping action of the paint pump to spray the nuts in the material basket. The paint is recycled, further reducing the amount of paint prepared and wasted. During the spray coating process with the spray gun, the material basket drives the nuts to turn over under the action of the basket driving mechanism, ensuring that the nuts are coated in place, solving the problem of local coating accumulation on the nuts, and improving the uniformity of the coating on the surface of the nuts.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, a return pipeline is provided between the paint pump and the paint bucket, so that a circulation loop can be formed between the paint pump and the paint bucket.

[0012] The beneficial effect of adopting the above further solution is that the circulation loop between the paint pump and the paint bucket can keep the paint in a circulating state, thereby ensuring the uniformity of the paint.

[0013] Furthermore, it also includes a blowing mechanism, which includes an air inlet pipe, an exhaust pipe and an exhaust fan. The air inlet pipe is used to connect the coating barrel with an air source, and the exhaust pipe is used to connect the coating barrel with an exhaust fan. The gas in the air inlet pipe can blow the paint on the surface of the nut so that the paint is evenly attached to the nut.

[0014] The beneficial effect of adopting the above further scheme is that after spray coating, the gas entering from the air inlet pipe can be blown toward the nuts in the material basket, dispersing the coating on the surface of the nuts, so that the coating is more evenly attached to various positions on the surface of the nuts. The gas generated during the blowing process can be uniformly extracted by an exhaust fan for treatment to prevent arbitrary discharge and pollution of the environment.

[0015] Furthermore, a filter is provided on the feed pipeline.

[0016] The beneficial effect of adopting the above further solution is that the filter can remove particulate impurities in the coating, preventing the impurities from adhering to the surface of the nut, causing poor appearance and performance of the nut, and affecting the coating quality of the nut.

[0017] Furthermore, the paint bucket is arranged at the bottom of the coating bucket.

[0018] The beneficial effect of adopting the above further scheme is that the paint bucket is directly set at the bottom of the spray coating bucket, eliminating the need for pipeline installation, saving costs, shortening the paint return path, and the excess paint drained by the spray coating bucket can flow directly into the paint bucket.

[0019] Furthermore, the material basket is tiltedly arranged in the coating barrel.

[0020] The beneficial effect of adopting the above further scheme is that the inclined material basket can make the lowest point of the material basket just above the mouth of the paint bucket, which is convenient for the backflow of excess paint; in addition, the inclined setting also facilitates the stable connection between the material basket and the basket drive mechanism, thereby realizing the rotational drive of the material basket.

[0021] Furthermore, the material basket includes a prism segment and a pyramid segment, and the cross-sections of the prism segment and the pyramid segment are both polygonal structures.

[0022] The beneficial effect of adopting the above further scheme is that the shape of the material basket can make the nut distribution position more concentrated, which is convenient for locking the coating area and improving the coating efficiency; the design of the prism section and the prism section can better drive the workpiece to flip compared with the cylindrical structure, thereby improving the coating efficiency and covering effect.

[0023] Furthermore, it also includes a cover driving mechanism for automatically opening and closing the barrel cover, the barrel cover is hinged to the barrel body, and the cover driving mechanism includes a driving cylinder, the cylinder body of the driving cylinder is connected to the barrel body, and the piston rod of the driving cylinder is connected to the barrel cover.

[0024] The beneficial effect of adopting the above further scheme is that under the action of the cover driving mechanism, the barrel cover of the coating barrel can be automatically opened and closed, and the barrel cover can be opened and closed conveniently and quickly without manual opening and closing, thereby reducing the labor intensity of workers.

[0025] Furthermore, the basket driving mechanism includes a driving motor, and the driving motor is arranged on the coating barrel, and the output shaft of the driving motor is plugged into the material basket.

[0026] The beneficial effect of adopting the above further scheme is that the rotation of the material basket is powered by the driving motor, and the output shaft of the driving motor can pass through the coating barrel and connect with the material basket to drive the rotation of the material basket; because the material basket not only needs to rotate, but also needs to be taken out together with the nut after the nut is coated, the material basket and the output shaft of the driving motor are connected by plug-in means.

[0027] The present invention also relates to a method for coating nuts for aerospace, using the automatic coating device for nuts for aerospace as described above, and the steps are as follows:

[0028] a. Add the prepared paint into the paint bucket;

[0029] b. Start the paint pump to keep the paint circulating;

[0030] c. Open the lid of the coating barrel and pour the nuts into the basket;

[0031] d. Start the drive motor to keep the basket rotating and the nut will flip along with the basket;

[0032] e. Open the control valve of the paint pipeline and use the spray gun to spray the nuts;

[0033] f. After spraying, close the control valve of the paint pipeline, and keep the basket rotating to drain excess paint;

[0034] g. Open the control valve of the air inlet pipe to purge the nut;

[0035] h. Blow until there is no flowing paint on the surface of the nut and close the control valve of the air inlet pipe;

[0036] i. Turn off the drive motor and the basket stops rotating;

[0037] j. Open the lid of the coating barrel;

[0038] k. Take out the basket, pour out the nuts, and put them into the oven for pre-curing;

[0039] l. Put the material basket back into the coating bucket;

[0040] m. According to the different thickness requirements of the nut surface coating, steps c to l can be repeated multiple times until the target thickness is reached;

[0041] n. Finished coating.

[0042] The beneficial effects of the present invention are as follows: the traditional dip coating method is changed to a flow coating method, that is, the nuts are flow coated by a spray gun. Compared with dip coating, the amount of coating required is less, which saves coating. During the flow coating process, the material basket drives the nuts to turn over under the action of the basket driving mechanism to ensure that the nuts are flow coated in place. After the flow coating, the material basket keeps rotating to drain off excess coating. The nuts after flow coating are purged to disperse the coating on the surface of the nuts, further ensuring that the coating is evenly attached to the surface of the nuts, solving the problem of local coating accumulation on the nuts, and further improving the uniformity of the coating on the surface of the nuts. The excess coating in the flow coating barrel can flow back into the coating barrel, and the coating is recycled, further reducing the amount of coating preparation and waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of the present invention;

[0044] Figure 2 It is a schematic diagram of the main structure of the present invention;

[0045] Figure 3It is a rear view structural schematic diagram of the present invention;

[0046] Figure 4 It is a left-side structural schematic diagram of the present invention;

[0047] Figure 5 It is a schematic cross-sectional structure diagram of the coating bucket, material basket and coating bucket of the present invention;

[0048] Figure 6 It is a structural schematic diagram of the material basket of the present invention;

[0049] Figure 7 This is a schematic diagram of the structure of the material basket and the drive motor in the plug-in state of the present invention;

[0050] In the figure, 1, coating barrel; 101, barrel body; 102, barrel cover; 2, paint barrel; 3, paint pump; 4, spray gun; 5, material basket; 501, prism section; 502, prism section; 503, connecting sleeve; 504, slot; 505, handle; 6, filter; 7, exhaust fan; 8, drive motor; 9, drive cylinder; 10, feed pipeline; 11, paint pipeline; 12, air inlet pipe; 13, exhaust pipe; 14, return pipeline; 15, motor coupling; 151, connecting rod. DETAILED DESCRIPTION

[0051] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0052] like Figure 1-Figure 7 As shown, an automatic coating device for nuts for aerospace use includes a coating barrel 1, a paint barrel 2, a paint pump 3, a spray gun 4, a material basket 5 and a basket driving mechanism. The coating barrel 1 includes a barrel body 101 and a barrel cover 102. The paint barrel 2 is connected to the paint pump 3 through a feed pipeline 10, and the paint pump 3 is connected to the spray gun 4 through a paint pipeline 11. The excess paint of the coating barrel 1 can flow back into the paint barrel 2.

[0053] The material basket 5 is arranged in the barrel body 101, and the material basket 5 is used to contain nuts. Under the action of the basket driving mechanism, the material basket 5 can rotate to turn over the nuts arranged in the material basket 5. The spray gun 4 is arranged on the barrel cover 102, and the spray gun 4 is used to spray paint to the nuts in the material basket 5.

[0054] The excess paint in the coating bucket 1 will flow back into the coating bucket 2. The paint in the coating bucket 2 can be pumped to the spray gun 4 by the paint pump 3 to spray the nuts in the material basket 5. The paint is circulated and can maintain the flow state of the paint to ensure the uniformity of the paint. The paint pump 3 can be a diaphragm pump.

[0055] The coating applied is a dry film lubricant, such as Everlube 620c.

[0056] A return pipe 14 is also provided between the paint pump 3 and the paint bucket 2, and a circulation loop can be formed between the paint pump 3 and the paint bucket 2. When the spray gun 4 does not need to spray, it only needs to close the paint pipe 11, and the paint pump 3 works. The paint can flow in the circulation loop formed by the paint bucket 2, the feed pipe 10, the paint pump 3 and the return pipe 14. The paint keeps circulating, which can ensure the fluidity and uniformity of the paint. Prepare for the subsequent spray coating of the nuts.

[0057] It also includes a blowing mechanism, which includes an air inlet pipe 12, an exhaust pipe 13 and an exhaust fan 7. The air inlet pipe 12 is used to connect the coating barrel 1 with an air source, and the exhaust pipe 13 is used to connect the coating barrel 1 with the exhaust fan 7. The gas in the air inlet pipe 12 can be blown to the paint on the surface of the nut so that the paint is evenly attached to the nut. One end of the exhaust pipe 13 is connected to the exhaust fan 7, and the other end is connected to the barrel cover 102 of the coating barrel 1. The air source can be supplied by compressed air, which enters through the air inlet pipe 12. The compressed air output from the outlet of the air inlet pipe 12 can be blown to the nuts in the material basket 5 to disperse the paint on the surface of the nuts, so that the paint is more evenly attached to various positions on the surface of the nuts. The exhaust gas and the compressed air in the purge process can be drawn away by the exhaust fan 7 for unified environmental protection treatment to prevent arbitrary discharge and pollution of the environment.

[0058] The air inlet end of the air inlet pipe 12 is connected to an air source for supplying compressed air, and the air outlet end of the air inlet pipe 12 can be connected to a spray gun 4, and compressed air can be sprayed out through the spray gun. After the nut is coated, the paint pipeline 11 can be closed and the air inlet pipe 12 can be opened. The medium in the spray gun 4 is switched from paint to compressed air, and the nuts after coating can be purged to disperse the accumulated paint, so that the paint is more evenly attached to various positions on the surface of the nut.

[0059] The feed pipe 10 is provided with a filter 6. The filter 6 is located between the paint bucket 2 and the paint pump 3, and can remove particulate impurities in the paint, prevent impurities from adhering to the surface of the nut, causing the nut to have a poor appearance and performance, and affecting the coating quality of the nut.

[0060] The paint bucket 2 is arranged at the bottom of the spray coating bucket 1. The paint bucket 2 is directly arranged at the bottom of the spray coating bucket 1, which saves the need for additional pipes, saves costs, shortens the paint return path, and the excess paint drained by the spray coating bucket 1 can flow directly into the paint bucket 2.

[0061] The material basket 5 is provided with a handle 505, which is convenient for manual taking and placing of the material basket 5.

[0062] A lid is provided between the paint bucket 2 and the spray coating bucket 1, and a reflux hole is provided on the lid. The reflux hole connects the paint bucket 2 and the spray coating bucket 1. The lid is provided on the paint bucket 2, and during the spray coating process, the excess paint in the spray coating bucket 1 can flow back into the paint bucket 2 through the reflux hole on the lid of the paint bucket 2, so as to be recycled, save paint, and reduce costs.

[0063] The basket 5 rotates at a constant speed under the action of the basket driving mechanism, and the nuts in the basket 5 can turn over at a constant speed, thereby improving the uniform adhesion of paint at various positions on the surface of the nuts in the basket 5.

[0064] The material basket 5 is tilted in the coating bucket 1. The tilted material basket 5 can make the lowest point of the material basket 5 just above the barrel mouth of the coating bucket 2, which is convenient for the return of excess paint; in addition, the tilted setting also facilitates the stable plugging of the material basket 5 and the basket driving mechanism to realize the rotation drive of the material basket 5.

[0065] The inclination angle α of the material basket 5 and the horizontal plane is 15-50 degrees, so that the nuts are more concentrated, which is convenient for locking the spray coating area, and the spray coating effect of the nuts is better. The lowest point of the material basket 5 can also be located above the barrel mouth of the paint bucket 2, which is convenient for the reflux of the paint after spray coating.

[0066] The material basket 5 includes a prism section 501 and a prism section 502, and the cross-sections of the prism section 501 and the prism section 502 are both polygonal structures. The shape of the material basket 5 can make the nuts more concentrated, which is convenient for locking the spray coating area and improving the spray coating efficiency; the design of the prism section 501 and the prism section 502 can better drive the turning of the workpiece nuts compared to the cylindrical structure, thereby improving the spray coating efficiency and coverage effect of the nuts.

[0067] It also includes a cover driving mechanism for automatically opening and closing the barrel cover 102, the barrel cover 102 is hinged to the barrel body 101, and the cover driving mechanism includes a driving cylinder 9, the cylinder body of the driving cylinder 9 is connected to the barrel body 101, and the piston rod of the driving cylinder 9 is connected to the barrel cover 102. Under the action of the cover driving mechanism, the barrel cover 102 of the spray coating barrel 1 can be automatically opened and closed, and the barrel cover 102 is convenient and quick to open and close, without manual opening and closing, reducing the labor intensity of workers. The spray coating barrel 1 is provided with an ear plate, and the barrel cover 102 is connected to the ear plate through a hinge shaft, and the cylinder body of the driving cylinder 9 can also be connected to the barrel body 101 through a hinge shaft.

[0068] The basket driving mechanism includes a driving motor 8, which is arranged on the coating barrel 1, and the output shaft of the driving motor 8 is plugged into the material basket 5. The rotation of the material basket 5 is powered by the driving motor 8, and the output shaft of the driving motor 8 can pass through the coating barrel 1 and connect with the material basket 5 to drive the rotation of the material basket 5; because the material basket 5 not only needs to rotate, but also needs to be taken out together with the nut after the nut is coated, the material basket 5 and the output shaft of the driving motor 8 are connected by plugging.

[0069] The output shaft of the driving motor 8 is provided with a motor coupling 15, and the motor coupling 15 is plugged into the material basket 5. Specifically, the material basket 5 is provided with a connecting sleeve 503 that can be plugged into the motor coupling 15, and the motor coupling 15 is provided with one or more connecting rods 151, and the connecting sleeve 503 is provided with a slot 504 that matches the connecting rod 151. The cooperation between the connecting rod 151 and the slot 504 enables the material basket 5 to rotate synchronously with the output shaft of the motor. The connection is convenient, which can realize the rotation drive of the material basket 5 and facilitate the removal and installation of the material basket 5.

[0070] The present invention also relates to a method for coating nuts for aerospace, using the automatic coating device for nuts for aerospace as described above, and the steps are as follows:

[0071] a. Add the prepared paint into the paint bucket 2;

[0072] b. Start the paint pump 3 to keep the paint circulating;

[0073] c. Open the lid 102 of the coating barrel 1 and pour the nuts into the basket 5;

[0074] d. Start the drive motor 8 to keep the basket 5 rotating at a constant speed, and the nut follows the basket 5 to turn evenly;

[0075] e. Open the control valve of the paint pipeline 11, and the spray gun 4 sprays the nut;

[0076] f. After spraying is completed, the control valve of the paint pipeline 11 is closed, and the basket 5 continues to rotate to drain away excess paint;

[0077] g. Open the control valve of the air intake pipe 12 to purge the nut;

[0078] h. Blow until there is no flowing paint on the surface of the nut, and close the control valve of the air inlet pipe 12;

[0079] i. Turn off the drive motor 8 and the basket 5 stops rotating;

[0080] j. Open the barrel cover 102 of the coating barrel 1;

[0081] k. Take out the basket 5, pour out the nuts, and put them into the oven for pre-curing;

[0082] l. Put the material basket 5 back into the coating barrel 1;

[0083] m. According to the different thickness requirements of the nut surface coating, steps c to l can be repeated multiple times until the target thickness is reached;

[0084] n. Finished coating.

[0085] After the coating is completed, the coated nuts can also be sprayed to further modify the appearance of the nuts.

[0086] The present invention adopts the pouring coating for nuts, which changes the traditional dip coating method, that is, the nuts are pour-coated by a spray gun 4. Compared with the dip coating, the amount of coating required is less, which saves coating. During the pouring coating process, the material basket 5 drives the nuts to turn under the action of the driving motor 8 to ensure that the nuts are poured in place. The material basket 5 keeps rotating after pouring, which can drain the excess coating in the pouring barrel 1, and also blows the nuts after pouring to disperse the coating on the surface of the nuts, further ensuring that the coating is evenly attached to the surface of the nuts, solving the problem of local coating accumulation on the nuts, and further improving the uniformity of the coating on the surface of the nuts; the excess coating in the pouring barrel 1 can directly flow into the coating barrel 2 through the reflux hole, and the circulation loop between the coating barrel 2 and the coating pump 3 ensures the fluidity and uniformity of the coating. The coating is recycled in the coating barrel 2, the coating pump 3, and the pouring barrel 1, further reducing the amount of coating prepared and wasted.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic spray coating device for nuts for aerospace, comprising a spray coating barrel (1), characterized in that: It also comprises a paint bucket (2), a paint pump (3), a spray gun (4), a material basket (5) and a basket driving mechanism. The spray coating bucket (1) comprises a bucket body (101) and a bucket cover (102). The paint bucket (2) is connected to the paint pump (3) via a material supply pipeline (10), and the paint pump (3) is connected to the spray gun (4) via a paint pipeline (11). Excess paint in the spray coating bucket (1) can flow back into the paint bucket (2). The material basket (5) is arranged in the barrel body (101), and the material basket (5) is used to contain nuts. Under the action of the basket driving mechanism, the material basket (5) rotates to turn over the nuts arranged in the material basket (5). The spray gun (4) is arranged on the barrel cover (102), and the spray gun (4) is used to spray paint on the nuts in the material basket (5).

2. The automatic spray coating device for aerospace nuts according to claim 1 is characterized in that: A return pipe (14) is also provided between the paint pump (3) and the paint bucket (2), so that a circulation loop can be formed between the paint pump (3) and the paint bucket (2).

3. The automatic spray coating device for aerospace nuts according to claim 2, characterized in that: The invention also comprises a blowing mechanism, which comprises an air inlet pipe (12), an exhaust pipe (13) and an exhaust fan (7). The air inlet pipe (12) is used to connect the coating barrel (1) with an air source, and the exhaust pipe (13) is used to connect the coating barrel (1) with the exhaust fan (7). The gas in the air inlet pipe (12) can be blown toward the coating on the surface of the nut so that the coating is evenly attached to the nut.

4. The automatic spray coating device for nuts for aerospace use according to claim 1, characterized in that: The feed pipeline (10) is provided with a filter (6).

5. The automatic spray coating device for nuts for aerospace use according to claim 1, characterized in that: The coating bucket (2) is arranged at the bottom of the coating bucket (1).

6. The automatic spray coating device for nuts for aerospace use according to claim 1, characterized in that: The material basket (5) is arranged obliquely in the coating barrel (1).

7. The automatic spray coating device for nuts for aerospace use according to claim 6, characterized in that: The material basket (5) comprises a prism section (501) and a pyramid section (502), and the cross-sections of the prism section (501) and the pyramid section (502) are both polygonal structures.

8. The automatic spray coating device for nuts for aerospace use according to claim 1, characterized in that: It also includes a cover driving mechanism for automatically opening and closing the barrel cover (102), wherein the barrel cover (102) is hinged to the barrel body (101), and the cover driving mechanism includes a driving cylinder (9), wherein the cylinder body of the driving cylinder (9) is connected to the barrel body (101), and the piston rod of the driving cylinder (9) is connected to the barrel cover (102).

9. The automatic spray coating device for nuts for aerospace use according to claim 1, characterized in that: The basket driving mechanism comprises a driving motor (8), the driving motor (8) is arranged on the coating barrel (1), and the output shaft of the driving motor (8) is plugged into the material basket (5).

10. A method for coating nuts for aerospace, characterized in that: The automatic spray coating device for aerospace nuts according to any one of claims 1 to 9 is used, and the steps are as follows: a. Add the prepared paint into the paint bucket (2); b. Start the paint pump (3) to keep the paint circulating; c. Open the lid (102) of the coating barrel (1) and pour the nuts into the basket (5); d. Start the drive motor (8) to keep the basket (5) rotating and the nut flipping along with the basket (5); e. Open the control valve of the paint pipeline (11) and spray the nut with the spray gun (4); f. After spraying, close the control valve of the paint pipeline (11), and keep the basket (5) rotating to drain away excess paint; g. Open the control valve of the air inlet pipe (12) to purge the nut; h. Blow until there is no flowing paint on the surface of the nut and close the control valve of the air inlet pipe (12); i. Turn off the drive motor (8) and stop the basket (5); j. Open the lid (102) of the coating barrel (1); k. Take out the basket (5) and pour out the nuts, and put them into the oven for pre-curing; l. Place the material basket (5) back into the coating bucket (1); m. According to the different thickness requirements of the nut surface coating, steps c to l can be repeated multiple times until the target thickness is reached; n. Finished coating.

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