A PCB board three-conformal paint spraying device that automatically masks the paint-free parts

Abstract

The present invention relates to the field of PCB spraying equipment, and discloses a PCB three-proof paint spraying device for automatically shielding the paint-free part, comprising a jig, a fixture and a spraying system, wherein the jig is used to fix the PCB, the fixture is used to fix the covering layer, the covering layer is a flexible film covering the surface of the PCB, the shape of the covering layer is designed as a specific contour according to the paint-free part of the PCB, the fixture comprises a base, an upper pressing plate and an upper pressure plate, the base is fixedly connected to the jig, the upper pressing plate can be lifted and rotated around a vertical line, the upper pressure plate can rotate around a vertical line, the upper pressing plate and the upper pressure plate are used to clamp the covering layer, and the edge of the covering layer is pulled by its own rotation to make the covering layer tensioned. The embodiment of the present invention adopts a flexible plastic film tensioned by the fixture as the covering layer of the paint-free part of the PCB, the plastic film has a low cost and does not need to be recycled, thereby eliminating the process of cleaning and drying the baffle, and reducing the production cost.

Description

Technical Field

[0001] The invention relates to the field of PCB painting equipment, and in particular to a PCB conformal coating device capable of automatically shielding paint-free parts. Background Art

[0002] Combination Figure 1 In the traditional conformal coating spraying device, the jig of the PCB board is transported by two side-by-side chain conveyors. The jig is used to fix the PCB board. The spray gun is driven by an XYZ coordinate robot and is responsible for spraying the conformal coating on the surface of the PCB board. Since the wiring terminals on the PCB board cannot contact the conformal coating, the wiring terminals must be shielded during operation to prevent the conformal coating from penetrating into the interior of the wiring terminals during the spraying process, causing functional failure or short circuit.

[0003] The traditional method of spraying conformal coating usually uses customized baffles to shield the terminal blocks. Different PCB boards require baffles of different specifications, which leads to frequent equipment preparation and replacement. After spraying, the baffles need to be disassembled, cleaned and dried, which increases a lot of manual workload and time costs.

[0004] In addition, manual masking operations are cumbersome and prone to uneven masking or errors, which affect production efficiency and product quality. Therefore, there is a great need for improvement in the prior art in the process of spraying conformal coatings to improve the degree of automation and production efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a PCB board three-conformal paint spraying device that automatically masks the paint-free parts, so as to solve the problem that the traditional three-conformal paint spraying method needs to use a customized baffle to mask the paint-free parts of the PCB board, and the process of installing, disassembling, cleaning and drying the baffle is cumbersome and complicated, and the labor cost is high.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] A PCB board three-conformal paint spraying device for automatically masking paint-free parts, comprising a jig, a fixture and a spraying system; the jig is used to fix the PCB board, the fixture is used to fix the covering layer, the covering layer is a flexible film covering the surface of the PCB board, the shape of the covering layer is designed to be a specific contour according to the paint-free part of the PCB board to ensure accurate masking of the paint-free part, the spraying system comprises an XYZ three-axis coordinate robot and a three-conformal paint spray gun, the three-conformal paint spray gun is driven by the XYZ three-axis coordinate robot, and the three-conformal paint spray gun sprays the three-conformal paint During the process, the covering layer is located between the three-proof paint spray gun and the PCB board; the fixture includes a base, an upper pressure plate and an upper pressure plate, the base is fixedly connected to the fixture, the upper pressure plate and the base are connected by a cylindrical pair so that the upper pressure plate can be lifted and lowered and rotated around a vertical line, the upper pressure plate and the base are connected by a rotating pair so that the upper pressure plate can rotate around a vertical line, the upper pressure plate and the upper pressure plate are used to clamp the covering layer, and pull the edge of the covering layer through its own rotation to make the covering layer tensioned.

[0008] Furthermore, it also includes: a conveying system, a roll film and a clamp actuating manipulator, the conveying system is used to convey the jig to the spraying system, the spraying system is used to spray three-proof paint on the PCB board fixed by the jig, the paint-free part of the PCB board is shielded by the covering layer, the clamp is installed on the edge of the jig, and the clamp is used to fix the covering layer; the unwinding mechanism and the winding mechanism of the roll film are respectively arranged on both sides of the conveying system, the covering layer is formed on the roll film by a stamping process, and the covering layer is connected to the roll film by an easy-to-tear line or an easy-to-break line; the clamp actuating manipulator is arranged between the unwinding mechanism and the winding mechanism, after the covering layer moves to the top of the PCB board along with the unwinding and winding actions of the roll film, the clamp actuating manipulator drives the clamp to sequentially complete the actions of tearing the covering layer from the roll film, clamping the covering layer and tensioning the covering layer.

[0009] Furthermore, a circular through hole vertically passing through the base is provided at the center of the base, a sliding column is inserted into the circular through hole, an upper pressure plate is fixedly connected to the upper end of the sliding column, an upper pressure plate is connected to the upper end of the base, and the upper pressure plate can rotate around the axis of the circular through hole; the upper pressure plate and the upper pressure plate are close to each other so as to clamp the edge of the covering layer in the middle, and when the upper pressure plate rotates in a direction away from the center of the covering layer, the upper pressure plate rotates synchronously, and a prestress away from the center of the covering layer is applied to the edge of the covering layer, so that the covering layer is tensioned.

[0010] Furthermore, a guide groove connected to the circular through hole is provided inside the base, and a guide block is provided on the sliding column. The guide block can be slidably arranged inside the guide groove, and the guide groove includes an upper annular groove, a vertical groove, and a lower annular groove connected in sequence from top to bottom. The upper annular groove and the lower annular groove are both arranged around the axis of the circular through hole, and the vertical groove is parallel to the axis of the circular through hole. When the guide block is located inside the lower annular groove, the covering layer is clamped by the upper pressure plate and the upper pressure plate.

[0011] Furthermore, the clamp actuating manipulator includes a first electric push rod, a rotary cylinder and a finger cylinder, the actuator of the finger cylinder is equipped with a clamp, the clamp is used to clamp the sliding column, the rotary cylinder is used to rotate the finger cylinder so that the sliding column rotates around the axis of the circular through hole, thereby completing the action of tensioning the covering layer, the first electric push rod is used to vertically move the rotary cylinder so that the sliding column moves along the axis of the circular through hole, so that the upper pressure plate and the upper pressure plate of the clamp are close to or away from each other, thereby completing the action of tearing off the covering layer and clamping the covering layer.

[0012] Furthermore, the roll film includes two parallel strips, and a plurality of covering layers are evenly formed between the two strips along the length direction of the roll film. The covering layer and the strip are connected by an easy-tear line or an easy-break line, and there is an opening between the covering layer and the strip for the upper pressing plate of the clamp to pass through; the covering layer moves at a position higher than the PCB board, and when the upper pressing plate is at the highest point of its own stroke, the upper pressing plate is higher than the covering layer, and after the covering layer is torn off, the strip continues to be rolled up by the winding mechanism.

[0013] Furthermore, another clamp actuating robot is provided downstream of the spraying system and above the conveying system for driving the clamp to release the covering layer.

[0014] Furthermore, a suction cup manipulator is arranged downstream of the spraying system and above the conveying system, and the suction cup manipulator includes a second electric push rod, a thrust cylinder, a suction cup bracket and multiple vacuum suction cups, the suction cup bracket is used to install the vacuum suction cup, the vacuum suction cup is used to adsorb the covering layer, the thrust cylinder is used to drive the suction cup bracket to move vertically, so that the vacuum suction cup descends to adsorb the covering layer, or rises to carry the covering layer away from the PCB board, and the second electric push rod is used to drive the thrust cylinder to move horizontally, so that the covering layer carried by the vacuum suction cup leaves the conveying system.

[0015] Furthermore, the fixture includes a support plate with a window, the PCB board is placed at the center of the support plate, the pins of the components of the PCB board are exposed below the window, and the support plate is also provided with a slide groove extending toward the window. The positioning plate of the PCB board is connected to the slide groove by bolts, the bottom wall of the positioning plate contacts the top surface of the support plate, and the side wall of the positioning plate contacts the side surface of the PCB board.

[0016] Furthermore, the conveying system includes two side-by-side and symmetrical chains and a driving device for the chains. Both sides of the jig are directly placed on top of the two chains. A top baffle close to the top surface of the jig is provided above the chains, and side baffles close to the side walls of the jig are provided on the sides of the chains.

[0017] Compared with the prior art, this application has the following beneficial effects:

[0018] A PCB conformal coating device for automatically shielding paint-free parts is provided. An embodiment of the present invention adopts a flexible plastic film tensioned by a clamp as a covering layer of the paint-free parts of the PCB board, so that the paint-free parts are protected from being sprayed with paint. Compared with a customized baffle, the cost of the plastic film is low and does not need to be recycled, thereby eliminating the process of cleaning and drying the baffle and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] Figure 1 This is a three-dimensional diagram of a traditional PCB conformal coating spraying device;

[0021] Figure 2 A three-dimensional diagram of a non-working state of a fixture for a PCB board according to an embodiment of the present invention;

[0022] Figure 3 A three-dimensional diagram of the working state of the fixture of the PCB board according to the embodiment of the present invention;

[0023] Figure 4 A top view of a clamp according to an embodiment of the present invention;

[0024] Figure 5 for Figure 4 Cross-sectional view in the AA direction;

[0025] Figure 6 for Figure 5 A three-dimensional diagram of the invention, in which the sliding column, the upper pressing plate and the lower pressing plate are hidden;

[0026] Figure 7 A three-dimensional diagram of an embodiment of the present invention;

[0027] Figure 8 A top view of a state where a roll film according to an embodiment of the present invention is covered on a PCB board;

[0028] Fig. 9 It is a front view of the actuation process of the clamp actuating manipulator and the suction cup manipulator according to an embodiment of the present invention;

[0029] Fig.10 A three-dimensional diagram of the actuation process of the suction cup manipulator according to an embodiment of the present invention;

[0030] The numbers in the figure represent the following:

[0031] 1-PCB board; 11-covering layer; 2-fixture; 21-supporting plate; 211-window; 212-slide groove; 22-positioning plate; 23-bolt; 3-clamp; 31-base; 311-circular through hole; 312-guide groove; 313-vertical groove; 314-upper annular groove; 315-lower annular groove; 32-sliding column; 321-guide block; 322-polygonal column; 33-upper pressure plate; 34-upper pressure plate; 35-lower pressure plate; 36- Lower pressure plate; 4- conveying system; 41- chain; 42- top baffle; 43- side baffle; 5- spraying system; 51- XYZ three-axis robot; 52- three-conformal paint spray gun; 6- roll film; 61- strip; 7- fixture actuating manipulator; 71- first electric push rod; 72- rotary cylinder; 73- finger cylinder; 74- clamp; 8- suction cup manipulator; 81- second electric push rod; 82- thrust cylinder; 83- suction cup bracket; 84- vacuum suction cup. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to solve the problem that the traditional three-conformal paint spraying method needs to use a customized baffle to shield the paint-free part of the PCB board 1, the process of installing, disassembling, cleaning and drying the baffle is cumbersome and complicated, and the labor cost is high.

[0034] Combination Figure 7An embodiment of the present invention provides a PCB board conformal coating spraying device for automatically masking paint-free parts, which is mainly used for automatically spraying conformal coating on a PCB board 1, and includes a jig 2, a fixture 3, a conveying system 4, a covering layer 11 and a spraying system 5.

[0035] Combination Figure 2 , Figure 3 The fixture 2 includes a supporting plate 21 with a window 211. The PCB board 1 is placed at the center of the supporting plate 21. The pins of the components of the PCB board 1 are exposed below the window 211 so that the flux can be sprayed from bottom to top. The supporting plate 21 is also provided with a slide groove 212 extending toward the window 211. The positioning plate 22 of the PCB board 1 is connected to the slide groove 212 through a bolt 23. The bottom wall of the positioning plate 22 contacts the top surface of the supporting plate 21, and the side wall of the positioning plate 22 contacts the side surface of the PCB board 1.

[0036] The conveying system 4 includes two side-by-side and symmetrical chains 41 and a driving device for the chains 41. Both sides of the jig 2 are directly placed on top of the two chains 41. A top baffle 42 close to the top surface of the jig 2 is arranged above the chains 41, and a side baffle 43 close to the side wall of the jig 2 is arranged on the side of the chains 41.

[0037] The spraying system 5 includes an XYZ three-axis coordinate robot and a conformal coating spray gun 52. The conformal coating spray gun 52 is driven by the XYZ three-axis coordinate robot. The covering layer 11 is a flexible plastic film. During the process of spraying the conformal coating, the covering layer 11 is located between the conformal coating spray gun 52 and the PCB board 1, thereby preventing the conformal coating from being sprayed onto the inside of the terminal.

[0038] The core of the PCB board conformal coating device is the clamp 3 , which is arranged at the four corners of the fixture 2 . The clamp 3 is used to clamp the covering layer 11 covering the top of the PCB board 1 .

[0039] Combination Figure 4 , Figure 5 , Figure 6 The clamp 3 includes a base 31, a circular through hole 311 which vertically passes through the base 31 is arranged at the center of the base 31, a sliding column 32 is inserted into the circular through hole 311, the sliding column 32 and the circular through hole 311 form a cylindrical pair, an upper pressure plate 33 and a lower pressure plate 35 are fixedly connected at both ends of the sliding column 32, an upper pressure plate 34 and a lower pressure plate 36 are connected at both ends of the base 31, the upper pressure plate 34 and the lower pressure plate 36 can both rotate around the axis of the circular through hole 311, when the upper pressure plate 33 contacts the upper pressure plate 34, the lower pressure plate 35 moves away from the lower pressure plate 36, and vice versa.

[0040] The upper pressing plate 33 and the upper pressure plate 34 are used to clamp the covering layer 11, and the lower pressing plate 35 and the lower pressure plate 36 are used to clamp plastic films for other purposes.

[0041] The upper pressure plate 33 and the lower pressure plate 35 are both in the shape of long strips perpendicular to the sliding column 32, and one end of the upper pressure plate 33 and the lower pressure plate 35 is fixedly connected to the sliding column 32, the upper pressure plate 34 and the lower pressure plate 36 are both in the shape of circular rings surrounding the sliding column 32, and the other ends of the upper pressure plate 33 and the lower pressure plate 35 are respectively aligned with the surfaces of the upper pressure plate 34 and the lower pressure plate 36.

[0042] In order to prevent the sliding column 32 from rotating on its own, there is a certain friction between the sliding column 32 and the base 31, and there is also a certain friction between the base 31 and the upper pressure plate 34. When there is no external force, the sliding column 32 maintains the current height and angle unchanged.

[0043] In order to enable the upper pressure plate 33 and the upper pressure plate 34 to tension the covering layer 11, a guide groove 312 connected to the circular through hole 311 is arranged inside the base 31, and a guide block 321 is arranged on the sliding column 32. The guide groove 312 includes an upper annular groove 314, a vertical groove 313, and a lower annular groove 315 which are sequentially connected from top to bottom. The upper annular groove 314 and the lower annular groove 315 are both arranged around the axis of the circular through hole 311, and the vertical groove 313 is parallel to the axis of the circular through hole 311. The guide block 321 is slidably arranged inside the guide groove 312.

[0044] When the slider slides along the vertical groove 313 to the position of the lower annular groove 315, the upper pressure plate 33 and the upper pressure plate 34 clamp the covering layer 11, and then the sliding column 32 is rotated to make the slider slide inside the upper annular groove 314, so that the corners of the covering layer 11 clamped by the upper pressure plate 33 and the upper pressure plate 34 are pulled outward, thereby tensioning the covering layer 11.

[0045] Based on the above embodiments, the present invention uses a flexible plastic film to replace the baffle. After spraying the conformal coating, there is no need to clean the covering layer 11, which can be directly removed and discarded, thereby saving labor costs.

[0046] Furthermore, in order to automatically form a covering layer 11 on the surface of the PCB board 1 , the embodiment of the present invention further includes a laminating system.

[0047] Combination Figure 8 Before the PCB board 1 arrives at the spraying system 5, an unwinding mechanism and a rewinding mechanism of the roll film 6 are respectively arranged on both sides of the conveying system 4, which are not shown in the figure. The covering layer 11 is conveyed by the roll film 6. The roll film 6 includes two parallel strips 61. A number of covering layers 11 are evenly distributed between the two strips 61 along the length direction of the roll film 6. The covering layer 11 and the strip 61 are connected by an easy-tear line or an easy-break line, and there is an opening between the covering layer 11 and the strip 61 for the upper pressing plate 33 of the clamp 3 to pass through. After the covering layer 11 is torn off, the strip 61 is further rewound.

[0048] A clamp-actuating robot 7 is provided between the unwinding mechanism and the rewinding mechanism. After the covering layer 11 moves to the top of the PCB board 1, the clamp 3 is manipulated by the clamp-actuating robot 7 to sequentially complete the actions of tearing the covering layer 11, clamping the covering layer 11 and tensioning the covering layer 11.

[0049] Combination Fig. 9 The fixture actuating manipulator 7 includes a first electric push rod 71, a rotary cylinder 72 and a finger cylinder 73. The actuator of the finger cylinder 73 is equipped with a clamp 74. The clamp 74 is used to clamp the polygonal column 322 on the top of the sliding column 32. The rotary cylinder 72 is used to rotate the finger cylinder 73 to make the sliding column 32 rotate around the axis of the circular through hole 311. The first electric push rod 71 is used to vertically move the rotary cylinder 72 to move the sliding column 32 along the axis of the circular through hole 311, so that the upper pressure plate 33 and the upper pressure plate 34 of the fixture 3 are close to or away from each other.

[0050] When the upper pressure plate 33 and the upper pressure plate 34 of the clamp 3 approach each other, the upper pressure plate 33 first contacts the portion of the roll film 6 that has the same shape as the covering layer 11, and pulls the covering layer 11 off the roll film 6, so that the four corners of the covering layer 11 are clamped by the four clamps 3, and then the rotating cylinder 72 drives the sliding column 32 to rotate, so that the upper pressure plate 33 and the upper pressure plate 34 rotate together, and the slider rotates inside the lower annular groove 315, and the four corners of the covering layer 11 are pulled in four directions away from the center of the covering layer 11, so that the covering layer 11 is tensioned.

[0051] After the PCB board 1 leaves the spraying system 5 , the covering layer 11 needs to be removed, so a clamp actuating robot 7 and a suction cup robot 8 are also provided downstream of the conveying system 4 .

[0052] Combination Fig. 9 The second clamp actuating robot 7 is used to execute the opposite working process of the first clamp actuating robot 7, so that the upper pressing plate 33 sequentially completes the process of rotating to release the tensioned covering layer 11, rising to move away from the covering layer 11, and rotating to avoid the exit path of the covering layer 11.

[0053] After the cover layer 11 is released by the clamp 3 , it is sucked by the suction cup robot 8 and moved to the outside of the conveying system 4 for disposal.

[0054] Combination Fig. 9 , Fig.10The suction cup manipulator 8 includes a second electric push rod 81, a thrust cylinder 82, a suction cup bracket 83 and multiple vacuum suction cups 84. The vacuum suction cup 84 is used to absorb the covering layer 11. The suction cup bracket 83 is used to install the vacuum suction cup 84. The thrust cylinder 82 is used to drive the suction cup bracket 83 to move vertically so that the vacuum suction cup 84 can be raised and lowered. The vacuum suction cup 84 descends to absorb the covering layer 11, and the vacuum suction cup 84 rises to carry the covering layer 11 away from the PCB board 1. The second electric push rod 81 is used to drive the thrust cylinder 82 to move horizontally, so that the covering layer 11 carried by the vacuum suction cup 84 is discarded after leaving the conveying system 4.

[0055] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A PCB board conformal coating spraying device that automatically masks paint-free areas, characterized in that: It includes a jig (2), a fixture (3) and a spraying system (5); The jig (2) is used to fix the PCB (1); the clamp (3) is used to fix the covering layer (11); the covering layer (11) is a flexible film covering the surface of the PCB (1); the shape of the covering layer (11) is designed to be a specific contour according to the paint-free part of the PCB (1) to ensure accurate masking of the paint-free part; the spraying system (5) comprises an XYZ three-axis coordinate robot (51) and a conformal coating spray gun (52); the conformal coating spray gun (52) is driven by the XYZ three-axis coordinate robot (51); during the process of the conformal coating spray gun (52) spraying the conformal coating, the covering layer (11) is located between the conformal coating spray gun (52) and the PCB (1); The clamp (3) comprises a base (31), an upper pressure plate (33) and an upper pressure plate (34); the base (31) is fixedly connected to the fixture (2); the upper pressure plate (33) and the base (31) are connected via a cylindrical pair so that the upper pressure plate (33) can be lifted and lowered and rotated around a vertical line; the upper pressure plate (34) and the base (31) are connected via a rotating pair so that the upper pressure plate (34) can rotate around a vertical line; the upper pressure plate (33) and the upper pressure plate (34) are used to clamp the covering layer (11) and pull the edge of the covering layer (11) by their own rotation so that the covering layer (11) is tensioned; It also includes: a conveying system (4), a film roll (6), and a fixture actuating manipulator (7), wherein the conveying system (4) is used to convey the fixture (2) to the spraying system (5), and the spraying system (5) is used to spray conformal coating on a PCB (1) fixed by the fixture (2), wherein a paint-free portion of the PCB (1) is shielded by the covering layer (11), and the fixture (3) is installed at an edge of the fixture (2), and the fixture (3) is used to fix the covering layer (11); An unwinding mechanism and a rewinding mechanism for the roll film (6) are respectively arranged on both sides of the conveying system (4); the covering layer (11) is formed on the roll film (6) by a stamping process; the covering layer (11) is connected to the roll film (6) by an easy-tear line or an easy-break line; The clamp actuating manipulator (7) is arranged between the unwinding mechanism and the rewinding mechanism, and after the covering layer (11) moves to the top of the PCB board (1) as the roll film (6) is rewinded and unrolled, the clamp actuating manipulator (7) drives the clamp (3) to sequentially complete the actions of tearing the covering layer (11) from the roll film (6), clamping the covering layer (11), and tensioning the covering layer (11); A circular through hole (311) vertically penetrating the base (31) is provided at the center of the base (31); a sliding column (32) is inserted into the circular through hole (311); an upper pressure plate (33) is fixedly connected to the upper end of the sliding column (32); an upper pressure plate (34) is connected to the upper end of the base (31); and the upper pressure plate (34) is capable of rotating around the axis of the circular through hole (311); The upper pressure plate (33) and the upper pressure plate (34) are close to each other so as to clamp the edge of the covering layer (11) in the middle. When the upper pressure plate (33) rotates in a direction away from the center of the covering layer (11), the upper pressure plate (34) rotates synchronously, and a prestress away from the center of the covering layer (11) is applied to the edge of the covering layer (11), so that the covering layer (11) is tensioned.

2. A PCB board conformal coating device for automatically shielding paint-free areas according to claim 1, characterized in that: A guide groove (312) connected to the circular through hole (311) is arranged inside the base (31), and a guide block (321) is arranged on the sliding column (32). The guide block (321) is slidably arranged inside the guide groove (312). The guide groove (312) comprises an upper annular groove (314), a vertical groove (313), and a lower annular groove (315) which are sequentially connected from top to bottom. The upper annular groove (314) and the lower annular groove (315) are both arranged around the axis of the circular through hole (311). The vertical groove (313) is parallel to the axis of the circular through hole (311). When the guide block (321) is located inside the lower annular groove (315), the covering layer (11) is clamped by the upper pressure plate (33) and the upper pressure plate (34).

3. A PCB board conformal coating spraying device for automatically shielding paint-free parts according to claim 2, characterized in that: The clamp actuating manipulator (7) comprises a first electric push rod (71), a rotary cylinder (72) and a finger cylinder (73); the actuator of the finger cylinder (73) is provided with a clamp (74); the clamp (74) is used to clamp the sliding column (32); the rotary cylinder (72) is used to rotate the finger cylinder (73) so that the sliding column (32) rotates around the axis of the circular through hole (311), thereby completing the action of tensioning the covering layer (11); the first electric push rod (71) is used to vertically move the rotary cylinder (72) so that the sliding column (32) moves along the axis of the circular through hole (311), so that the upper pressure plate (33) and the upper pressure plate (34) of the clamp (3) are moved closer to or farther from each other, thereby completing the actions of tearing off the covering layer (11) and clamping the covering layer (11).

4. The PCB board conformal coating spraying device for automatically shielding the paint-free parts according to claim 1 is characterized in that: The roll film (6) comprises two parallel strips (61), a plurality of covering layers (11) are evenly formed between the two strips (61) along the length direction of the roll film (6), the covering layer (11) and the strips (61) are connected by an easy-tear line or an easy-break line, and an opening is provided between the covering layer (11) and the strips (61) for the upper pressing plate (33) of the clamp (3) to pass through; The covering layer (11) moves to a position higher than the PCB board (1), and when the upper pressing plate (33) is located at the highest point of its own travel, the upper pressing plate (33) is higher than the covering layer (11), and after the covering layer (11) is torn off, the strip (61) continues to be reeled up by the reeling mechanism.

5. The PCB board conformal coating spraying device for automatically shielding the paint-free parts according to claim 1 is characterized in that: Another clamp actuating manipulator (7) is also provided downstream of the spraying system (5) and above the conveying system (4), and is used to drive the clamp (3) to perform an action of releasing the covering layer (11).

6. A PCB board conformal coating spraying device for automatically shielding paint-free areas according to claim 5, characterized in that: A suction cup manipulator (8) is arranged downstream of the spraying system (5) and above the conveying system (4). The suction cup manipulator (8) comprises a second electric push rod (81), a thrust cylinder (82), a suction cup bracket (83) and a plurality of vacuum suction cups (84). The suction cup bracket (83) is used to mount the vacuum suction cup (84). The vacuum suction cup (84) is used to absorb the covering layer (11). The thrust cylinder (82) is used to drive the suction cup bracket (83) to move vertically, so that the vacuum suction cup (84) descends to absorb the covering layer (11), or rises to carry the covering layer (11) away from the PCB board (1). The second electric push rod (81) is used to drive the thrust cylinder (82) to move horizontally, so that the covering layer (11) carried by the vacuum suction cup (84) leaves the conveying system (4).

7. The PCB board conformal coating spraying device for automatically shielding the paint-free parts according to claim 1, characterized in that: The fixture (2) comprises a supporting plate (21) having a window (211); the PCB board (1) is placed at the center of the supporting plate (21); pins of components of the PCB board (1) are exposed below the window (211); a slide groove (212) extending toward the window (211) is further provided on the supporting plate (21); a positioning plate (22) of the PCB board (1) is connected to the slide groove (212) via a bolt (23); a bottom wall of the positioning plate (22) contacts a top surface of the supporting plate (21); and a side wall of the positioning plate (22) contacts a side surface of the PCB board (1).

8. The PCB board conformal coating spraying device for automatically shielding the paint-free parts according to claim 1, characterized in that: The conveying system (4) comprises two symmetrically arranged chains (41) and a driving device for the chains (41); the two sides of the jig (2) are directly placed on top of the two chains (41); a top baffle (42) close to the top surface of the jig (2) is arranged on the top of the chains (41); and a side baffle (43) close to the side wall of the jig (2) is arranged on the side of the chain (41).

Images