A MiniLED circuit board coating device

Abstract

The present application relates to a coating device for a MiniLED circuit board, which belongs to the field of PCB processing technology, and includes a base, a coating drive assembly mounted on the base, a first mounting platform, a second mounting platform, a first oil pan arranged on the first mounting platform, a limit assembly, a first coating wheel rotatably arranged on the first mounting platform, a second oil pan arranged on the second mounting platform, and a second coating wheel rotatably arranged on the second mounting platform, wherein a coating space for the MiniLED circuit board to pass through is arranged between the first coating wheel and the second coating wheel; when the MiniLED circuit board is located in the coating space, the first coating wheel and the second coating wheel are respectively pressed against the two side surfaces of the MiniLED circuit board; the first oil pan and the second oil pan are used to receive dripping oil, the coating wheel is used to dip in oil, and the coating drive assembly is used to simultaneously drive the first coating wheel and the second coating wheel to rotate in opposite directions. The present application has the effect of improving the stability of the circuit board when ink is applied to the surface of the MiniLED circuit board.

Description

Technical Field

[0001] This application relates to the field of PCB processing, and in particular to a MiniLED circuit board coating device. Background Art

[0002] With the rise of the market demand for MINILED circuit boards, the surface flatness and ink thickness stability of the traditional screen printing white oil process are not good, resulting in poor product production yield and quality stability. The existing technology is to use a tension elastic screen to carry the ink + a squeegee to press down and move left and right to transfer the ink to the PCB in-process product.

[0003] The thickness of the MiniLED circuit board is relatively thin and more brittle than that of the existing circuit board. The screen printing method not only has poor control over the ink thickness stability, but also the squeegee is easy to damage the circuit board. Therefore, the improved MiniLED circuit board screen printer uses a roller printing method, where a rotating roller with oil on its surface is abutted against the surface of the MiniLED circuit board, and one end of the circuit board is clamped by two or more jigs and the circuit board is pulled. The roller rolls on the surface of the circuit board, thereby coating the oil on the surface of the circuit board.

[0004] In view of the above related technical solutions, in order to avoid damaging the MiniLED circuit board, the circuit board will not be clamped too tightly. Therefore, during the process of pulling the circuit board, it is easy to occur that due to a relative sliding displacement between a jig for clamping the circuit board and the circuit board, the circuit board rotates and shifts during the coating process, affecting the printing quality on the surface of the MiniLED circuit board. Summary of the Invention

[0005] In order to improve the stability of the circuit board when coating ink on the surface of the MiniLED circuit board, thereby improving the printing quality, this application provides a MiniLED circuit board coating device.

[0006] The MiniLED circuit board coating device provided by this application adopts the following technical solutions:

[0007] A MiniLED circuit board coating device, comprising a base, a coating driving assembly mounted on the base, a first mounting table, a second mounting table, a first oil pan arranged on the first mounting table, a limiting assembly, a first coating wheel rotatably arranged on the first mounting table, a second oil pan arranged on the second mounting table, and a second coating wheel rotatably arranged on the second mounting table. The rotation axes of the first coating wheel and the second coating wheel are arranged in parallel, and a coating space for the MiniLED circuit board to pass through is provided between the first coating wheel and the second coating wheel. The first oil pan and the second oil pan are respectively located below the first coating wheel and the second coating wheel, and the first oil pan and the second oil pan are respectively located on both sides of the coating space. The first oil pan and the second oil pan are used to respectively receive the oil dripping from the first coating wheel and the second coating wheel. The coating driving assembly is used to simultaneously drive the first coating wheel and the second coating wheel to rotate in opposite directions to each other.

[0008] There are two groups of the limiting assemblies, and the two groups of the limiting assemblies are respectively located at both ends of the coating space. The limiting assembly is provided with a limiting groove for the MiniLED circuit board to pass through, and the limiting groove is communicated with the coating space. The bottoms of the two limiting grooves are arranged opposite to each other and are parallel to each other, and the limiting groove is perpendicular to the rotation axes of the first coating wheel and the second coating wheel.

[0009] By adopting the above technical solution, the oil is evenly coated on the first coating wheel and the second coating wheel. The MiniLED circuit board is inserted from the coating space between the first coating wheel and the second coating wheel, and both ends of the circuit board are simultaneously slid into the two limiting grooves. The first coating wheel and the second coating wheel clamp and fix the MiniLED circuit board between them. The first coating wheel and the second coating wheel respectively abut against both side surfaces of the MiniLED circuit board. The coating driving assembly drives the first coating wheel and the second coating wheel to rotate in opposite directions to each other simultaneously and roll on both side surfaces of the MiniLED circuit board, so as to evenly roll and coat the oil on both side surfaces of the MiniLED circuit board. The oil dripping from the first coating wheel and the second coating wheel is received in the first oil pan and the second oil pan, which is convenient for the recovery of the oil. During the process of painting the circuit board, both ends of the circuit board respectively abut against the bottoms of the two limiting grooves. Since the limiting groove is perpendicular to the rotation axes of the first coating wheel and the second coating wheel, the limiting assembly restricts the rotation and offset of the circuit board during the coating process, thereby improving the stability of the circuit board when coating the ink on the surface of the MiniLED circuit board.

[0010] Optionally, the limiting component includes a limiting mounting frame fixedly arranged on the first mounting table, a limiting block slidably arranged on the limiting mounting frame, a reset spring arranged between the limiting mounting frame and the limiting block, and a locking member; the straight line where the sliding direction of the limiting block is located is parallel to the rotation axes of the first coating wheel and the second coating wheel, the two limiting blocks are arranged oppositely, both ends of the reset spring are connected to the limiting mounting frame and the limiting block at the same time, and the reset spring has a function of restricting the two limiting blocks from moving away from each other; the locking member is used to restrict the relative sliding of the limiting block on the limiting mounting frame.

[0011] By adopting the above technical solution, it is convenient to adjust the distance between the two limiting blocks according to the different sizes of the MiniLED circuit boards to be processed, and the limiting block is fixed on the limiting mounting frame through the locking member to fix the distance between the two limiting blocks, which is convenient for coating processing of MiniLED circuit boards of the same size specification.

[0012] Optionally, a guiding surface is arranged at one end of the limiting block close to the coating space, and one end of the guiding surface is connected to the bottom of the limiting groove; the two guiding surfaces of the two limiting blocks are inclined away from each other at the ends away from the limiting groove.

[0013] By adopting the above technical solution, it is convenient for the MiniLED circuit board to be inserted into the limiting groove.

[0014] Optionally, the first coating wheel includes a roller shaft rotatably arranged on the first mounting table and a coating cloth coaxially sleeved on the roller shaft; the coating cloth is a flexible adsorption material for adsorbing oil, and the second coating wheel has the same structure as the first coating wheel.

[0015] By adopting the above technical solution, during the process of the flexible coating cloth rolling and painting the surface of the MiniLED circuit board, it is not easy to damage the circuit devices on the MiniLED circuit board, and at the same time, the painting dead angles caused by the protrusions of the circuit devices on the MiniLED circuit board are minimized, improving the painting quality of the MiniLED circuit board.

[0016] Optionally, the plane where the rotation axes of the first coating wheel and the second coating wheel are located is horizontally arranged.

[0017] By adopting the above technical solution, when painting the MiniLED circuit board, the MiniLED circuit board needs to be vertically inserted between the first coating wheel and the second coating wheel. Compared with horizontally painting the MiniLED circuit board, the painting amount on both sides of the MiniLED circuit board is more uniform and consistent, further improving the painting quality of the MiniLED circuit board.

[0018] Optionally, the first mounting table is slidably arranged on the base, and an adjustment driving assembly for driving the first mounting table to move in a direction close to or away from the second mounting table is arranged on the base.

[0019] By adopting the above technical solution, according to the different thicknesses of the MiniLED circuit boards to be painted, the width of the coating space is adjusted by driving the first mounting table to move through the adjustment driving assembly, improving the adaptability of the device of the present application to MiniLED circuit boards of different models and specifications.

[0020] Optionally, a first scraping blade assembly is arranged on the first mounting table. The straight line where the blade of the first scraping blade assembly is located is arranged parallel to the rotation axis of the first coating wheel. The blade of the first scraping blade assembly is arranged opposite to the circumferential surface of the first coating wheel and has a gap therebetween;

[0021] A second scraping blade assembly is arranged on the second mounting table. The straight line where the blade of the second scraping blade assembly is located is arranged parallel to the rotation axis of the second coating wheel. The blade of the second scraping blade assembly is arranged opposite to the circumferential surface of the second coating wheel and has a gap therebetween.

[0022] By adopting the above technical solution, after the first coating wheel and the second coating wheel rotate and dip in the oil, the first scraping blade assembly and the second scraping blade assembly scrape the oil adhering to the first coating wheel and the second coating wheel, so that the oil on the surfaces of the first coating wheel and the second coating wheel is evenly distributed, further improving the quality of painting the MiniLED circuit board.

[0023] Optionally, the first scraping blade assembly is slidably arranged on the first mounting table, and a first driving member is arranged on the first mounting table. The first driving member is used for driving the first scraping blade assembly to slide in a direction close to or away from the first coating wheel;

[0024] The second scraping blade assembly is slidably arranged on the second mounting table, and a second driving member is arranged on the second mounting table. The second driving member is used for driving the second scraping blade assembly to slide in a direction close to or away from the second coating wheel.

[0025] By adopting the above technical solution, it is convenient to control the thickness of the oil dipped on the coating wheel by adjusting the distance between the scraping blade and the coating wheel according to the different amounts of paint required on the MiniLED circuit board, further improving the adaptability of the device of the present application under different processing requirements.

[0026] Optionally, a first paint scraping member is arranged on each side of the first scraping blade assembly, and the two first paint scraping members are respectively used for slidingly abutting against the two end surfaces of the first coating wheel;

[0027] On each side of the second scraper assembly, a second paint scraping member is provided, and the two second paint scraping members are respectively used for slidingly abutting against the two end surfaces of the second coating wheel.

[0028] By adopting the above technical solution, the first paint scraping member and the second paint scraping member scrape off the oil at both ends of the first coating wheel and the second coating wheel when the first coating wheel and the second coating wheel paint the MiniLED circuit board, and try to prevent the oil at both ends of the coating wheel from flowing to the positions on the MiniLED circuit board that do not need to be painted under the action of gravity and centrifugal force, thereby further improving the painting quality of the MiniLED circuit board.

[0029] Optionally, the first paint scraping member is detachably and slidably arranged on the first scraper assembly, and the straight line where the sliding direction of the first paint scraping member is located is parallel to the rotation axis of the first coating wheel; the second paint scraping member is detachably and slidably arranged on the second scraper assembly, and the straight line where the sliding direction of the second paint scraping member is located is parallel to the rotation axis of the second coating wheel.

[0030] By adopting the above technical solution, on the one hand, it is convenient to remove the first paint scraping member and the second paint scraping member for replacement and cleaning, and on the other hand, it is convenient to adjust the positions of the first paint scraping member and the second paint scraping member according to the different lengths of the first coating wheel and the second coating wheel to ensure that the paint scraping members slide and abut against the two end surfaces of the coating wheel.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. The problem that the blade coating is likely to damage the circuit board is avoided as much as possible;

[0033] 2. The painting quality of the MiniLED circuit board is improved;

[0034] 3. The adaptability of the device of the present application under different processing requirements is improved. Description of the Drawings

[0035] Figure 1 It is a schematic structural diagram of a MiniLED circuit board coating device of the present application.

[0036] Figure 2 It is an exploded structural diagram of the first coating wheel and the second coating wheel in a MiniLED circuit board coating device of the present application.

[0037] Figure 3 It is a schematic cross-sectional structure diagram of a limit component in a MiniLED circuit board coating device of the present application.

[0038] Figure 4 It is a partial enlarged view A in a MiniLED circuit board coating device of the present application.

[0039] Description of reference numerals: 1, base; 2, first mounting table; 21, first oil pan; 22, limiting assembly; 221, limiting mounting frame; 222, limiting block; 2221, limiting groove; 2222, guiding surface; 223, return spring; 224, locking member; 3, second mounting table; 31, second oil pan; 4, coating driving assembly; 41, driving motor; 42, driving rod; 421, first bevel gear; 422, second bevel gear; 43, first transmission member; 44, second transmission member; 5, adjustment driving assembly; 6, first coating wheel; 61, roller shaft; 62, coating cloth; 7, second coating wheel; a, coating space; 8, first scraper assembly; 81, tool body; 82, first paint scraping member; 9, second scraper assembly; 92, second paint scraping member. Detailed implementation manners

[0040] The present application will be further described in detail below with reference to the accompanying drawings.

[0041] An embodiment of the present application discloses a MiniLED circuit board coating device. Referring to Figure 1 and Figure 2 , the MiniLED circuit board coating device includes a base 1, a first mounting table 2 slidably disposed on the base 1, a second mounting table 3 fixed on the base 1, a coating driving assembly 4, an adjustment driving assembly 5, a first oil pan 21 fixed on the first mounting table 2, a limiting assembly 22, a first coating wheel 6 rotatably disposed on the first mounting table 2, a second oil pan 31 fixed on the second mounting table 3, and a second coating wheel 7 rotatably disposed on the second mounting table 3. The rotation axes of the first coating wheel 6 and the second coating wheel 7 are parallelly arranged, and a coating space a for the MiniLED circuit board to pass through is provided between the first coating wheel 6 and the second coating wheel 7; when the MiniLED circuit board is located in the coating space a, the first coating wheel 6 and the second coating wheel 7 respectively abut against both side surfaces of the MiniLED circuit board.

[0042] The first oil pan 21 and the second oil pan 31 are respectively located below the first coating wheel 6 and the second coating wheel 7, and the first oil pan 21 and the second oil pan 31 are respectively located on both sides of the coating space a; the first oil pan 21 and the second oil pan 31 are used for storing oil, the first coating wheel 6 and the second coating wheel 7 are used for dipping oil, and the first oil pan 21 and the second oil pan 31 are used for respectively receiving the oil dripping from the first coating wheel 6 and the second coating wheel 7; the coating driving assembly 4 is used for simultaneously driving the first coating wheel 6 and the second coating wheel 7 to rotate in opposite directions. The adjustment driving assembly 5 drives the first mounting table 2 to move towards or away from the second mounting table 3 by means of the transmission of a motor and a lead screw.

[0043] The operator evenly coats the oil on the first coating wheel 6 and the second coating wheel 7, inserts the MiniLED circuit board into the coating space a between the first coating wheel 6 and the second coating wheel 7. According to the different thicknesses of the MiniLED circuit boards to be painted, the driving assembly 5 is adjusted to drive the first mounting table 2 to move, so as to adjust the width of the coating space a, so that the first coating wheel 6 and the second coating wheel 7 clamp and fix the MiniLED circuit board between them. The coating driving assembly 4 is used to drive the first coating wheel 6 and the second coating wheel 7 to rotate in the reverse direction. While the first coating wheel 6 and the second coating wheel 7 are rotating, they roll on both side surfaces of the MiniLED circuit board, and evenly roll-coat the oil on both side surfaces of the MiniLED circuit board. The oil dripping from the first coating wheel 6 and the second coating wheel 7 is received in the first oil pan 21 and the second oil pan 31, which is convenient for the collection of the oil.

[0044] Refer to Figure 1 and Figure 2 , the plane where the rotation axes of the first coating wheel 6 and the second coating wheel 7 are located is horizontally arranged; the first coating wheel 6 includes a roller shaft 61 rotatably arranged on the first mounting table 2 and a coating cloth 62 coaxially sleeved on the roller shaft 61; the coating cloth 62 is a sponge pad for dipping and adsorbing oil. The second coating wheel 7 has the same structure as the first coating wheel 6; when painting the MiniLED circuit board, the MiniLED circuit board is vertically inserted between the first coating wheel 6 and the second coating wheel 7. Compared with horizontally painting the MiniLED circuit board, the painting amounts on both side surfaces of the MiniLED circuit board are more uniform and consistent; during the process of rolling and painting the surface of the MiniLED circuit board with the flexible coating cloth 62, it is not easy to crush the circuit devices on the MiniLED circuit board, and at the same time, the painting dead corners caused by the protrusions of the circuit devices on the MiniLED circuit board are minimized, improving the painting quality of the MiniLED circuit board.

[0045] Refer to Figure 1 and Figure 3 , there are two sets of limiting components 22, and the two sets of limiting components 22 are respectively located at both ends of the coating space a, and the two sets of limiting components 22 are symmetrically arranged; the limiting component 22 includes a limiting mounting frame 221 fixed on the first mounting table 2, a limiting block 222 arranged on the limiting mounting frame 221, a return spring 223 and a locking member 224. The limiting mounting frame 221 is provided with a receiving groove for accommodating and having a shape adapted to the limiting block 222, and the limiting block 222 is horizontally slidably arranged in the receiving groove; both ends of the return spring 223 are respectively connected to the bottom of the receiving groove and the limiting block 222, and the return spring 223 has an elastic potential energy for restricting the limiting block 222 from sliding towards the bottom of the receiving groove.

[0046] On the opposite sides of the two limiting blocks 222, limiting grooves 2221 are provided for the MiniLED circuit board to slide and fit into. The two limiting grooves 2221 are parallel to each other and vertically arranged. One end of the limiting groove 2221 close to the coating space a is communicated with the coating space a. One end of the limiting block 222 close to the coating space a is provided with a guiding surface 2222, and one end of the guiding surface 2222 is connected to the bottom of the limiting groove 2221; the two guiding surfaces 2222 of the two limiting blocks 222 are inclined away from each other at the ends away from the limiting grooves 2221; the locking member 224 is a locking bolt, and the locking bolt penetrates through the limiting mounting frame 221 and is threadedly connected to the limiting mounting frame 221 and extends into the accommodating space.

[0047] During the process of painting the circuit board, the MiniLED circuit board is inserted from the coating space a between the first coating wheel 6 and the second coating wheel 7, so that both ends of the circuit board slide and fit into the two limiting grooves 2221 at the same time. The arrangement of the guiding surface 2222 facilitates the insertion of the circuit board into the limiting groove 2221; both ends of the circuit board are respectively abutted against the bottoms of the two limiting grooves 2221, and the return spring 223 compresses to adjust the distance between the two limiting blocks 222. The sliding block is fixed in the accommodating groove through the locking member 224, which is convenient for the subsequent coating process of the same type of MiniLED circuit board. The limiting component 22 restricts the rotation and offset of the circuit board during the coating process, thereby improving the stability of the circuit board when coating ink on the surface of the MiniLED circuit board.

[0048] Refer to Figure 1 and Figure 2 As shown in FIGS. and, the coating driving assembly 4 includes a servo motor, a driving rod 42, a first transmission member 43 mounted on the first mounting frame, and a second transmission member 44 mounted on the second mounting frame. The driving rod 42 is coaxially and fixedly connected to the output end of the servo motor. A first bevel gear 421 and a second bevel gear 422 are coaxially sleeved on the driving rod 42. The first bevel gear 421 is slidably keyed to the driving rod 42 to enable the first bevel gear 421 to slide along the length direction of the driving rod 42 while rotating coaxially with the driving rod 42, and the second bevel gear 422 is coaxially and fixedly connected to the driving rod 42; the first transmission member 43 is a transmission rod rotatably mounted on the first mounting frame, and one end of the transmission rod is meshed with the first bevel gear 421 through a bevel gear; a gear is provided at the other end of the transmission rod and is meshed with the gear provided at one end of the roller shaft 61 of the first coating wheel 6; the second transmission member 44 has the same structure as the first transmission member 43, and the second coating wheel 7 is meshed and driven with the second bevel gear 422 in the same way, so as to realize the reverse rotation of the first coating wheel 6 and the second coating wheel 7 driven by the servo motor at the same time.

[0049] Refer to Figure 2 and Figure 4, a first scraping blade assembly 8 is slidably arranged on the first mounting table 2, and a second scraping blade assembly 9 is slidably arranged on the second mounting table 3. The straight line where the cutting edge of the first scraping blade assembly 8 is located is arranged parallel to the rotation axis of the first coating wheel 6. The cutting edge of the first scraping blade assembly 8 is arranged facing the circumferential surface of the coating cloth 62 in the first coating wheel 6. The first scraping blade assembly 8 is pushed by two air cylinders fixedly arranged on the first mounting frame to slide in a direction close to or away from the first coating wheel 6, so as to adjust the distance between the first scraping blade assembly 8 and the first coating wheel 6, which is convenient for controlling the thickness of the oil dipped on the coating wheel by adjusting the distance between the scraping blade and the coating wheel according to the different amounts of paint required on the MiniLED circuit board, further improving the adaptability of the device of the present application under different processing requirements.

[0050] Refer to Figure 2 and Figure 4 , the first scraping blade assembly 8 includes a blade body 81 and first paint scraping members 82 slidably arranged on both sides of the blade body 81. The first paint scraping members 82 are slidably arranged on the blade body 81 along the length direction of the blade body 81 in a manner of rail-slider cooperation, and the first paint scraping members 82 are fixed on the blade body 81 through fastening bolts; the two first paint scraping members 82 are respectively used for slidingly abutting against the two end surfaces of the coating cloth 62 in the first coating wheel 6; the arrangement of the first paint scraping members 82 scrapes off the oil at both ends of the first coating wheel 6 and the second coating wheel 7 when the MiniLED circuit board is painted, and tries to prevent the oil at both ends of the coating wheel from flowing to the positions on the MiniLED circuit board that do not need to be painted under the action of gravity and centrifugal force, thereby further improving the painting quality of the MiniLED circuit board. The detachable and slidable arrangement of the first paint scraping members 82 is convenient for removing and replacing the first paint scraping members 82 and the second paint scraping members 91 for cleaning on the one hand, and on the other hand, it is convenient to adjust the positions of the first paint scraping members 82 according to the different lengths of the first coating wheel 6 to ensure that the paint scraping members slide and abut against the two end surfaces of the coating wheel.

[0051] Refer to Figure 2 and Figure 4 , a second scraping blade assembly 9 is slidably arranged on the second mounting table 3. The structure of the second scraping blade assembly 9 is the same as that of the first scraping blade assembly 8, including a blade body 81 and second paint scraping members 91 arranged on both sides of the blade body 81. And the installation method of the second scraping blade assembly 9 on the second mounting table 3 is the same as that of the first scraping blade assembly 8. The second scraping blade assembly 9 is pushed by two air cylinders fixedly arranged on the second mounting frame to slide in a direction close to or away from the second coating wheel 7, and the thickness of the oil dipped on the coating wheel is controlled by adjusting the distance between the scraping blade and the coating wheel.

[0052] The implementation principle of a MiniLED circuit board coating device in an embodiment of this application is as follows: Insert the MiniLED circuit board into the coating space a between the first coating wheel 6 and the second coating wheel 7. The first coating wheel 6 and the second coating wheel 7 clamp and fix the MiniLED circuit board between them. The coating drive assembly 4 drives the first coating wheel 6 and the second coating wheel 7 to rotate in opposite directions. While the first coating wheel 6 and the second coating wheel 7 are rotating, they dip into the oils in the first oil pan 21 and the second oil pan 31, and roll on both side surfaces of the MiniLED circuit board, evenly rolling and coating the oils on both side surfaces of the MiniLED circuit board, thus avoiding the problem that the blade coating is likely to damage the circuit board as much as possible.

[0053] The above are all preferred embodiments of this application. The protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A MiniLED circuit board coating device, characterized in that: It includes a base (1), a coating driving assembly (4) installed on the base (1), a first mounting table (2), a second mounting table (3), a first oil pan (21) arranged on the first mounting table (2), a limiting assembly (22), a first coating wheel (6) rotatably arranged on the first mounting table (2), a second oil pan (31) arranged on the second mounting table (3), and a second coating wheel (7) rotatably arranged on the second mounting table (3). The rotation axes of the first coating wheel (6) and the second coating wheel (7) are arranged in parallel, and a coating space (a) for the MiniLED circuit board to pass through is provided between the first coating wheel (6) and the second coating wheel (7); the first oil pan (21) and the second oil pan (31) are respectively located below the first coating wheel (6) and the second coating wheel (7), and the first oil pan (21) and the second oil pan (31) are respectively located on both sides of the coating space (a); the first oil pan (21) and the second oil pan (31) are used to respectively receive the oil dripping from the first coating wheel (6) and the second coating wheel (7); the coating driving assembly (4) is used to drive the first coating wheel (6) and the second coating wheel (7) to rotate in opposite directions simultaneously; there are two groups of the limiting assemblies (22), and the two groups of the limiting assemblies (22) are respectively located at both ends of the coating space (a). The limiting assembly (22) is provided with a limiting groove (2221) for the MiniLED circuit board to pass through. The limiting groove (2221) is communicated with the coating space (a). The bottoms of the two limiting grooves (2221) are arranged opposite to each other and are parallel to each other. The limiting groove (2221) is perpendicular to the rotation axes of the first coating wheel (6) and the second coating wheel (7); The limiting assembly (22) includes a limiting mounting frame (221) fixedly arranged on the first mounting table (2), a limiting block (222) slidably arranged on the limiting mounting frame (221), a return spring (223) arranged between the limiting mounting frame (221) and the limiting block (222), and a locking member (224); the straight line where the sliding direction of the limiting block (222) is located is parallel to the rotation axes of the first coating wheel (6) and the second coating wheel (7). The two limiting blocks (222) are arranged oppositely. Both ends of the return spring (223) are simultaneously connected to the limiting mounting frame (221) and the limiting block (222). The return spring (223) has a function of restricting the two limiting blocks (222) from moving away from each other; the locking member (224) is used to restrict the limiting block (222) from sliding relative to the limiting mounting frame (221); One end of the limiting block (222) close to the coating space (a) is provided with a guiding surface (2222), and one end of the guiding surface (2222) is connected to the bottom of the limiting groove (2221); the two guiding surfaces (2222) of the two limiting blocks (222) are inclined in a direction away from each other at the ends away from the limiting groove (2221).

2. The MiniLED circuit board coating device according to claim 1, wherein: The first coating wheel (6) includes a roller shaft (61) rotatably arranged on the first mounting table (2) and a coating cloth (62) coaxially sleeved on the roller shaft (61); the coating cloth (62) is a flexible adsorption material for dipping and adsorbing oil, and the second coating wheel (7) has the same structure as the first coating wheel (6).

3. The MiniLED circuit board coating device according to claim 1, wherein: The plane where the rotation axes of the first coating wheel (6) and the second coating wheel (7) are located is horizontally arranged.

4. A MiniLED circuit board coating device according to claim 1, characterized in that: The first mounting table (2) is slidably arranged on the base (1), and an adjustment driving assembly (5) for driving the first mounting table (2) to move in a direction close to or away from the second mounting table (3) is arranged on the base (1).

5. The MiniLED circuit board coating device according to claim 1, wherein: A first scraper assembly (8) is arranged on the first mounting table (2), the straight line where the cutting edge of the first scraper assembly (8) is located is arranged parallel to the rotation axis of the first coating wheel (6), the cutting edge of the first scraper assembly (8) is arranged opposite to the circumferential surface of the first coating wheel (6) and there is a gap; a second scraper assembly (9) is arranged on the second mounting table (3), the straight line where the cutting edge of the second scraper assembly (9) is located is arranged parallel to the rotation axis of the second coating wheel (7), and the cutting edge of the second scraper assembly (9) is arranged opposite to the circumferential surface of the second coating wheel (7) and there is a gap.

6. The MiniLED circuit board coating device according to claim 5, wherein: The first scraper assembly (8) is slidably arranged on the first mounting table (2), and a first driving member is arranged on the first mounting table (2) for driving the first scraper assembly (8) to slide in a direction close to or away from the first coating wheel (6): the second scraper assembly (9) is slidably arranged on the second mounting table (3), and a second driving member is arranged on the second mounting table (3) for driving the second scraper assembly (9) to slide in a direction close to or away from the second coating wheel (7).

7. A MiniLED circuit board coating device according to claim 5, characterized in that: A first paint scraping member (82) is arranged on each side of the first scraper assembly (8), and the two first paint scraping members (82) are respectively used for slidingly abutting against the two end surfaces of the first coating wheel (6): a second paint scraping member (91) is arranged on each side of the second scraper assembly (9), and the two second paint scraping members (91) are respectively used for slidingly abutting against the two end surfaces of the second coating wheel (7).

8. A MiniLED circuit board coating device according to claim 7, characterized in that: The first paint scraping member (82) is detachably and slidably arranged on the first scraper assembly (8), and the straight line where the sliding direction of the first paint scraping member (82) is located is parallel to the rotation axis of the first coating wheel (6); the second paint scraping member (91) is detachably and slidably arranged on the second scraper assembly (9), and the straight line where the sliding direction of the second paint scraping member (91) is located is parallel to the rotation axis of the second coating wheel (7).

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