A circuit board solder mask automatic coating device

Abstract

The present invention relates to the technical field of circuit boards, and discloses an automatic solder mask coating device for circuit boards, wherein two vertical plates are fixedly connected to the top of a base, a blower mechanism is installed above a first slide groove, a driving mechanism is installed between the two vertical plates, and two "T"-shaped guide grooves are provided on the inner walls of the two vertical plates. The driving mechanism can drive the clamped circuit board and the sprayer to move relative and oppositely, and the relative and opposite movement of the circuit board and the sprayer can be used to quickly coat the circuit board with solder mask, shortening the coating stroke, improving the coating efficiency of the circuit board, and facilitating batch coating of the circuit board. This method overcomes the problem that local areas on the surface of the circuit board are difficult to coat, and the limiter can limit the front and rear areas of the circuit board, and the anti-slip strip with a triangular structure can not only prevent the circuit board from slipping, but also prevent the limit plate from clamping too much to cause damage to the circuit board.

Description

Technical Field

[0001] The invention relates to the technical field of circuit boards, and in particular to an automatic solder mask coating device for circuit boards. Background Art

[0002] Solder resist, also known as solder mask (commonly known as green oil), is a protective layer applied on the circuits and substrates of printed circuit boards that do not require soldering. Solder resist is a liquid photosensitive material that has no affinity for liquid solder. Like photosensitive dry film, it will harden under the irradiation of light of a specific spectrum. When used, the solder resist must be mixed with the hardener. Solder resist is also called ink. The color of the circuit board that is usually seen is actually the color of the solder resist.

[0003] The Chinese patent discloses a circuit board solder mask coating device (authorization announcement number CN216217824U). When using the device, the circuit board body is placed in the slide grooves on the two clamping plates, and then the electric telescopic rod is started. The driving end of the electric telescopic rod drives the clamping plates to move toward the outer wall of the circuit board body, so that the clamping plates clamp the circuit board body to complete the fixation of the circuit board body, thereby ensuring the stability of the circuit board body during the operation of spraying solder mask. The threaded rod is screwed clockwise to drive the connecting plate 1 and the coating plate 2 to move downward, so that the coating plate 2 is attached to the upper side wall of the circuit board body. When the motor is started, the clockwise or counterclockwise rotation of the motor drives the tooth plate, the movable plate, the applicator plate one and the applicator plate two to move back and forth, so that the applicator plate one and the applicator plate two can quickly spray the solder mask on both sides of the circuit board body, thereby improving the work efficiency. However, it can be seen from the drawings in the specification that the slide groove in the splint has a certain depth, so when the circuit board is placed in the slide groove, the slide groove will block part of the area on the circuit board, so it is easy to cause the blocked area of ​​the circuit board to be unable to complete the coating work when the solder mask is applied, which has certain shortcomings. Summary of the invention

[0004] The purpose of the present invention is to provide a circuit board solder mask automatic coating device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic solder mask coating device for a circuit board, comprising a base, four first slide grooves are longitudinally opened on the top of the base, and a second slide groove is also transversely opened on the top of the base, two vertical plates are fixedly connected to the top of the base, a blower mechanism is installed above the first slide groove, a driving mechanism is installed between the two vertical plates, and two "T"-shaped guide grooves are opened on the inner walls of the two vertical plates;

[0006] The hair dryer mechanism comprises a first pad, a second pad and a first motor, the top of the base is fixedly connected to the first pad and the second pad, the first motor is fixedly connected to the first pad, the driving end of the first motor passes through the first pad and is fixedly connected to a bidirectional screw, the external thread sleeve of the bidirectional screw is provided with a first adjustment seat and a second adjustment seat, applicators are installed on the tops of the first adjustment seat and the second adjustment seat, and sliders are fixedly connected to the bottoms of the first adjustment seat and the second adjustment seat, the first adjustment seat is hingedly connected to the first bracket, the second adjustment seat is hingedly connected to the second bracket, one end of the first bracket and one end of the second bracket are hingedly connected to a fixing block, the bottom of the fixing block is fixedly connected to an anti-dropping block, and the top of the fixing block is fixedly connected to the second motor, and the driving end of the second motor is fixedly connected to a fan blade;

[0007] The driving mechanism includes a third motor, a gear and a guide block. The third motor is fixedly connected to the vertical plate, and the driving end of the third motor passes through the vertical plate and is fixedly connected to the gear. The top and bottom of the gear are respectively meshed with the first rack and the second rack. The outer walls of the first rack and the second rack are fixedly connected to guide blocks. The inner wall of the second rack is also fixedly connected to a mounting frame, and the mounting frame is fixedly connected to the fourth motor. The driving end of the fourth motor passes through the mounting frame and is fixedly connected to an electric push rod. A splint is fixedly connected to the telescopic end of the electric push rod, and two groups of symmetrically distributed limiters are installed at the bottom of the splint. The number of first racks is two, and a cross plate is fixedly connected between the two first racks, and a sprayer is installed in the middle of the cross plate.

[0008] Optionally, the slider is slidably connected to the inside of the first slide groove, the anti-slip block is slidably connected to the inside of the second slide groove, the lengths of the first bracket and the second bracket are equal, and the inclination angles of the first bracket and the second bracket are the same.

[0009] Optionally, the applicator includes a hollow rod, a bolt and a round rod, the bolt is threadedly connected to the hollow rod, the round rod is slidably inserted on the top of the hollow rod, and the top of the round rod is fixedly connected to a brush.

[0010] Optionally, the bottom end of the hollow rod is fixedly connected to the first adjustment seat, and one end of the bolt abuts against the round rod.

[0011] Optionally, the limiter includes a telescopic rod, a limit plate and a disc, one end of the telescopic rod is fixedly connected to the limit plate, and the other end of the telescopic rod is fixedly connected to the disc, the external sliding sleeve of the telescopic rod is provided with a spring and a fastening block, and a plurality of groups of anti-slip strips are equidistantly fixed to the limit plate.

[0012] Optionally, the fastening block is fixed to the bottom of the clamping plate, and the top of the limiting plate is flush with the top of the clamping plate.

[0013] Optionally, the anti-slip strip is a triangular structure, one end of the spring is fixedly connected to the disc, and the other end of the spring is fixedly connected to the fastening block.

[0014] Optionally, the sprayer includes a cylinder, a paint storage box and a discharge port, the cylinder is fixedly connected to the top of the horizontal plate, and the telescopic end of the cylinder passes through the horizontal plate and is fixedly connected to the paint storage box, the bottom of the paint storage box is fixedly connected to the discharge port, an electromagnetic valve is installed on the discharge port, and the bottom end of the discharge port is fixedly connected to a pipe, and the bottom of the pipe is fixedly connected to multiple groups of nozzles.

[0015] Optionally, the guide block is adapted to the guide groove, and the guide block is slidably connected inside the guide groove.

[0016] Optionally, the first rack and the second rack are of equal length, a feed port and a booster pump are fixedly connected to the rear surface of the paint storage box, and an air inlet end of the booster pump is fixedly connected to the paint storage box.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The blower mechanism can drive the first bracket and the second bracket to move, and the movement of the first bracket and the second bracket can drive the fixed block and the second motor to move left and right, so that the solder mask applied on the upper circuit board can be quickly dried, shortening the drying cycle of the solder mask.

[0019] 2. The applicator can move the brush to the circuit board by adjusting it, and utilize the relative and opposite movements of the first adjustment seat and the second adjustment seat to drive the brush to evenly smooth the solder mask applied on the circuit board. This can not only prevent uneven thickness of the solder mask, but also further enhance the drying effect of the solder mask when used in conjunction with the fan blades.

[0020] 3. The driving mechanism can drive the clamped circuit board and the sprayer to move relative and oppositely. The relative and opposite movement of the circuit board and the sprayer can be used to quickly apply solder mask to the circuit board, shortening the application stroke, improving the application efficiency of the circuit board, and facilitating batch application of the circuit board. This method also overcomes the problem that local areas on the surface of the circuit board are difficult to apply.

[0021] 4. The limiter can limit the front and rear areas of the circuit board, and the anti-slip strip with a triangular structure can not only prevent the circuit board from slipping, but also prevent the limit plate from clamping too hard and causing damage to the circuit board, thus ensuring the normal coating of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a circuit board solder mask automatic coating device of the present invention;

[0023] Figure 2 It is a structural schematic diagram of a blower mechanism in an automatic solder mask coating device for a circuit board of the present invention;

[0024] Figure 3 This is a structural schematic diagram of a neutral plate of an automatic solder mask coating device for a circuit board of the present invention;

[0025] Figure 4 It is a structural schematic diagram of an applicator in an automatic solder mask coating device for a circuit board of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of a driving mechanism in a circuit board solder mask automatic coating device of the present invention;

[0027] Figure 6 It is a structural schematic diagram of a stopper in an automatic solder mask coating device for a circuit board according to the present invention;

[0028] Figure 7 The present invention is a schematic diagram of the structure of a sprayer in an automatic solder mask coating device for a circuit board.

[0029] In the figure: 1, base; 2, first slide; 3, second slide; 4, vertical plate; 41, guide groove; 5, blower mechanism; 51, first pad; 52, second pad; 53, first motor; 531, two-way screw; 532, first adjustment seat; 533, second adjustment seat; 54, applicator; 541, hollow rod; 542, bolt; 543, round rod; 544, brush; 55, slider; 56, first bracket; 57, second bracket; 58, fixing block; 581, anti-drop block; 59, second motor; 591, fan blade ; 6. Driving mechanism; 61. The third motor; 62. Gear; 621. The first rack; 622. The second rack; 63. The guide block; 64. The mounting frame; 641. The fourth motor; 642. The electric push rod; 65. The clamp; 66. The limiter; 661. The telescopic rod; 662. The limiter plate; 663. The disc; 664. The spring; 665. The fastening block; 666. The anti-slip strip; 67. The horizontal plate; 68. The sprayer; 681. The cylinder; 682. The paint storage box; 683. The discharge port; 684. The solenoid valve; 685. The pipeline. DETAILED DESCRIPTION

[0030] 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.

[0031] See also Figures 1 to 7The present invention provides an automatic solder mask coating device for a circuit board, comprising a base 1, four first slide grooves 2 are longitudinally opened on the top of the base 1, and a second slide groove 3 is also transversely opened on the top of the base 1, two vertical plates 4 are fixedly connected to the top of the base 1, a blower mechanism 5 is installed above the first slide groove 2, a driving mechanism 6 is installed between the two vertical plates 4, and two "T"-shaped guide grooves 41 are opened on the inner walls of the two vertical plates 4.

[0032] The hair dryer mechanism 5 includes a first pad 51, a second pad 52 and a first motor 53. The first pad 51 and the second pad 52 are fixedly connected to the top of the base 1. The first motor 53 is fixedly connected to the first pad 51. The driving end of the first motor 53 passes through the first pad 51 and is fixedly connected to a bidirectional screw rod 531. The external thread sleeve of the bidirectional screw rod 531 is provided with a first adjustment seat 532 and a second adjustment seat 533. Applicators 54 are installed on the tops of the first adjustment seat 532 and the second adjustment seat 533, and sliders 55 are fixedly connected to the bottoms of the first adjustment seat 532 and the second adjustment seat 533. The first bracket 56 is hinged on the first adjustment seat 532, and the second bracket 57 is hinged on the second adjustment seat 533. The slider 55 is slidably connected to the inside of the first slide groove 2. The anti-slip block 581 is slidably connected to the inside of the second slide groove 3, the first bracket 56 and the second bracket 57 are of equal length, and the inclination angles of the first bracket 56 and the second bracket 57 are the same, one end of the first bracket 56 and one end of the second bracket 57 are hinged with a fixed block 58, the bottom of the fixed block 58 is fixedly connected with an anti-slip block 581, and the top of the fixed block 58 is fixedly connected with a second motor 59, and the driving end of the second motor 59 is fixedly connected with a fan blade 591, and the blower mechanism 5 can drive the first bracket 56 and the second bracket 57 to move, and the movement of the first bracket 56 and the second bracket 57 can further drive the fixed block 58 and the second motor 59 to move left and right, so that the solder mask applied on the upper circuit board can be quickly dried, thereby shortening the drying cycle of the solder mask.

[0033] The applicator 54 includes a hollow rod 541, a bolt 542 and a round rod 543. The bolt 542 is threadedly connected to the hollow rod 541, and the round rod 543 is slidably inserted on the top of the hollow rod 541. The top of the round rod 543 is fixedly connected with a brush 544. The bottom end of the hollow rod 541 is fixedly connected to the first adjustment seat 532, and one end of the bolt 542 is against the round rod 543. The applicator 54 can move the brush 544 to the circuit board by adjustment, and utilize the relative and opposite movements of the first adjustment seat 532 and the second adjustment seat 533 to drive the brush 544 to evenly smooth the solder mask applied on the circuit board, which can not only prevent the uneven thickness of the solder mask application, but also further enhance the drying effect of the solder mask when used in conjunction with the fan blades 591.

[0034] The driving mechanism 6 includes a third motor 61, a gear 62 and a guide block 63. The third motor 61 is fixedly connected to the vertical plate 4, and the driving end of the third motor 61 passes through the vertical plate 4 and is fixedly connected to the gear 62. The top and bottom of the gear 62 are respectively meshed with a first rack 621 and a second rack 622. The outer walls of the first rack 621 and the second rack 622 are fixedly connected to the guide block 63. The guide block 63 is adapted to the guide groove 41, and the guide block 63 is slidably connected to the inside of the guide groove 41. The inner wall of the second rack 622 is also fixedly connected to the mounting frame 64, and the mounting frame 64 is fixedly connected to the fourth motor 641. The driving end of the fourth motor 641 passes through the mounting frame 64 and is fixedly connected to the motor Push rod 642, a clamping plate 65 is fixedly connected to the telescopic end of the electric push rod 642, two groups of symmetrically distributed limiters 66 are installed at the bottom of the clamping plate 65, the number of first racks 621 is two, a cross plate 67 is fixedly connected between the two first racks 621, and a sprayer 68 is installed in the middle of the cross plate 67. The driving mechanism 6 can drive the clamped circuit board and the sprayer 68 to move relative and oppositely. The relative and opposite movement of the circuit board and the sprayer 68 can be used to quickly apply solder mask to the circuit board, shortening the application stroke, improving the application efficiency of the circuit board, and facilitating batch application of the circuit board. In addition, this method overcomes the problem that it is difficult to apply paint to local areas on the surface of the circuit board.

[0035] The limiter 66 includes a telescopic rod 661, a limit plate 662 and a disc 663. One end of the telescopic rod 661 is fixedly connected to the limit plate 662, and the other end of the telescopic rod 661 is fixedly connected to the disc 663. The external sliding sleeve of the telescopic rod 661 is provided with a spring 664 and a fastening block 665. A plurality of groups of anti-skid strips 666 are equidistantly fixedly connected to the limit plate 662. The fastening block 665 is fixedly connected to the bottom of the clamping plate 65. The top of the limit plate 662 is flush with the top of the clamping plate 65. The anti-skid strip 666 is a triangular structure. One end of the spring 664 is fixedly connected to the disc 663, and the other end of the spring 664 is fixedly connected to the fastening block 665. The limiter 66 can limit the front and rear areas of the circuit board, and the anti-skid strip 666 with a triangular structure can not only prevent the circuit board from slipping, but also prevent the limit plate 662 from clamping too much to cause damage to the circuit board, thereby ensuring the normal coating of the circuit board.

[0036] The sprayer 68 includes a cylinder 681, a paint storage box 682 and a discharge port 683. The cylinder 681 is fixedly connected to the top of the cross plate 67, and the telescopic end of the cylinder 681 passes through the cross plate 67 and is fixedly connected to the paint storage box 682. The bottom of the paint storage box 682 is fixedly connected to the discharge port 683. A solenoid valve 684 is installed on the discharge port 683, and the bottom end of the discharge port 683 is fixedly connected to a pipe 685. The bottom of the pipe 685 is fixedly connected to multiple groups of nozzles. The first rack 621 and the second rack 622 are of equal length. The rear surface of the paint storage box 682 is also fixedly connected to a feed port and a booster pump. The air inlet end of the booster pump is fixedly connected to the paint storage box 682. The sprayer 68 pressurizes the paint storage box 682, and then opens the solenoid valve 684. The solder mask in the paint storage box 682 can be sprayed out through the discharge port 683 and multiple groups of nozzles, which is convenient for applying solder mask to the surface of the circuit board.

[0037] The first motor 53 , the third motor 61 and the fourth motor 641 are all servo motors, and the second motor 59 is a DC motor.

[0038] Working principle: When using this device, pour the solder mask paint into the paint storage box 682 from the feed port, then close the feed port, and then turn on the booster pump. At this time, the pressure in the paint storage box 682 increases, and then the limit plate 662 is held and pulled outward. At this time, the spring 664 is in a stretched state, and then the circuit board is placed between the two clamping plates 65. At this time, the two sets of electric push rods 642 are controlled to extend, so that the two clamping plates 65 can be driven to move relative to each other, thereby clamping the two sides of the circuit board, and then the limit plate 662 is released. At this time, the spring 664 retracts until the anti-slip strip 666 contacts the circuit board. At this time, the front and rear sides of the circuit board can be limited, and then the third motor 61 is controlled to work. After the third motor 61 rotates forward, it can drive the first rack 621 and the third rack 624. The two racks 622 move relative to each other, which can drive the cross plate 67 and the mounting frame 64 to move relative to each other. Then, the paint storage box 682 and the pipe 685 are driven downward by controlling the extension of the air cylinder 681, until the pipe 685 and the multiple groups of nozzles are moved to a specified distance on the circuit board for spraying. At this time, the solenoid valve 684 is opened. After the solenoid valve 684 is opened, the air pressure in the paint storage box 682 is reduced. At this time, the solder mask in the paint storage box 682 can enter the pipe 685 through the discharge port 683, and finally is sprayed on the circuit board below through the multiple groups of nozzles. Therefore, the driving mechanism 6 can drive the clamped circuit board and the sprayer 68 to move relative and oppositely. The relative and opposite movement of the circuit board and the sprayer 68 can be used to quickly apply solder mask to the circuit board. , shortening the coating stroke, improving the coating efficiency of the circuit board, facilitating batch coating of the circuit board, and this method overcomes the problem that it is difficult to coat the local area of ​​the circuit board surface. After the circuit board is sprayed, the fourth motor 641 is controlled to rotate in the opposite direction by 90 degrees, at which time the clamped circuit board can be driven to rotate in the opposite direction by 90 degrees, and then the round rod 543 is moved upward until the brush 544 moves onto the circuit board, and then the bolt 542 is tightened, at which time the brush 544 is able to rest against the circuit board, and then the first motor 53 and the second motor 59 are turned on. After the first motor 53 rotates forward and reversely, the bidirectional screw rod 531 can be driven to rotate forward and reversely. Since the slider 55 is slidably connected to the inside of the first slide groove 2, and the anti-slip block 581 is slidably connected to the inside of the second slide groove 3, At this time, the first adjustment seat 532 and the second adjustment seat 533 can be driven to move relative to and oppositely, and the first adjustment seat 532 and the second adjustment seat 533 can drive the first bracket 56 and the second bracket 57 to move during the relative and opposite movement, and then drive the fixing block 58 and the second motor 59 to move left and right, and the second motor 59 can also drive the fan blade 591 to rotate when moving left and right, so that the solder mask applied on the upper circuit board can be quickly dried, shortening the drying cycle of the solder mask, and the first adjustment seat 532 and the second adjustment seat 533 can also drive the two sets of brushes 544 to move back and forth at the bottom of the circuit board during the relative and opposite movement, and then drive the brushes 544 to evenly smooth the solder mask applied on the circuit board.It can not only prevent the uneven thickness of solder mask, but also can further improve the drying effect of solder mask when used with the fan blade 591. After the solder mask on the circuit board is dried, the two electric push rods 642 are controlled to shorten, and the circuit board can be taken out at this time.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circuit board solder mask automatic coating device, comprising a base (1), characterized in that: The top of the base (1) is provided with four first slide grooves (2) in the longitudinal direction, and the top of the base (1) is also provided with a second slide groove (3) in the transverse direction. Two vertical plates (4) are fixedly connected to the top of the base (1). A blower mechanism (5) is installed above the first slide grooves (2). A driving mechanism (6) is installed between the two vertical plates (4). Two "T"-shaped guide grooves (41) are provided on the inner walls of the two vertical plates (4). The hair dryer mechanism (5) comprises a first pad (51), a second pad (52) and a first motor (53); the first pad (51) and the second pad (52) are fixedly connected to the top of the base (1); the first pad (51) is fixedly connected to the first motor (53); the driving end of the first motor (53) passes through the first pad (51) and is fixedly connected to a bidirectional screw rod (531); the external thread sleeve of the bidirectional screw rod (531) is provided with a first adjustment seat (532) and a second adjustment seat (533); the tops of the first adjustment seat (532) and the second adjustment seat (533) are both provided with coatings. The wiper (54) is provided with a slider (55) fixedly connected to the bottom of the first adjustment seat (532) and the second adjustment seat (533); a first bracket (56) is hingedly connected to the first adjustment seat (532); a second bracket (57) is hingedly connected to the second adjustment seat (533); a fixing block (58) is hingedly connected to one end of the first bracket (56) and one end of the second bracket (57); an anti-dropping block (581) is fixedly connected to the bottom of the fixing block (58); a second motor (59) is fixedly connected to the top of the fixing block (58); and a fan blade (591) is fixedly connected to the driving end of the second motor (59); The driving mechanism (6) comprises a third motor (61), a gear (62) and a guide block (63); the third motor (61) is fixedly connected to the vertical plate (4); a driving end of the third motor (61) passes through the vertical plate (4) and is fixedly connected to the gear (62); a first rack (621) and a second rack (622) are respectively meshed at the top and bottom of the gear (62); the outer side walls of the first rack (621) and the second rack (622) are fixedly connected to the guide block (63); and the inner side wall of the second rack (622) is also fixedly connected to the A mounting frame (64) is fixedly connected to a fourth motor (641), a driving end of the fourth motor (641) passes through the mounting frame (64) and is fixedly connected to an electric push rod (642), a clamping plate (65) is fixedly connected to the telescopic end of the electric push rod (642), two groups of symmetrically distributed limiters (66) are installed at the bottom of the clamping plate (65), the number of the first racks (621) is two, a cross plate (67) is fixedly connected between the two first racks (621), and a sprayer (68) is installed in the middle of the cross plate (67).

2. The circuit board solder mask automatic coating device according to claim 1 is characterized in that: The slide block (55) is slidably connected to the inside of the first slide groove (2), the anti-drop block (581) is slidably connected to the inside of the second slide groove (3), the first bracket (56) and the second bracket (57) are of equal length, and the first bracket (56) and the second bracket (57) have the same inclination angle.

3. The circuit board solder mask automatic coating device according to claim 1 is characterized in that: The applicator (54) comprises a hollow rod (541), a bolt (542) and a round rod (543); the bolt (542) is threadedly connected to the hollow rod (541); the round rod (543) is slidably inserted at the top of the hollow rod (541); and the top of the round rod (543) is fixedly connected to a brush (544).

4. The circuit board solder mask automatic coating device according to claim 3 is characterized in that: The bottom end of the hollow rod (541) is fixedly connected to the first adjustment seat (532), and one end of the bolt (542) abuts against the round rod (543).

5. The circuit board solder mask automatic coating device according to claim 1, characterized in that: The limiter (66) comprises a telescopic rod (661), a limit plate (662) and a disc (663); one end of the telescopic rod (661) is fixedly connected to the limit plate (662), and the other end of the telescopic rod (661) is fixedly connected to the disc (663); an external sliding sleeve of the telescopic rod (661) is provided with a spring (664) and a fastening block (665); and a plurality of groups of anti-slip strips (666) are fixedly connected to the limit plate (662) at equal intervals.

6. The circuit board solder mask automatic coating device according to claim 5, characterized in that: The fastening block (665) is fixedly connected to the bottom of the clamping plate (65), and the top of the limiting plate (662) is flush with the top of the clamping plate (65).

7. The circuit board solder mask automatic coating device according to claim 5, characterized in that: The anti-slip strip (666) is a triangular structure, one end of the spring (664) is fixedly connected to the disc (663), and the other end of the spring (664) is fixedly connected to the fastening block (665).

8. The circuit board solder mask automatic coating device according to claim 1, characterized in that: The sprayer (68) comprises a cylinder (681), a paint storage box (682) and a discharge port (683); the cylinder (681) is fixedly connected to the top of the horizontal plate (67); the telescopic end of the cylinder (681) passes through the horizontal plate (67) and is fixedly connected to the paint storage box (682); the bottom of the paint storage box (682) is fixedly connected to the discharge port (683); a solenoid valve (684) is installed on the discharge port (683); the bottom end of the discharge port (683) is fixedly connected to a pipe (685); the bottom of the pipe (685) is fixedly connected to a plurality of nozzles.

9. The circuit board solder mask automatic coating device according to claim 1, characterized in that: The guide block (63) is adapted to the guide groove (41), and the guide block (63) is slidably connected inside the guide groove (41).

10. The circuit board solder mask automatic coating device according to claim 8, characterized in that: The first rack (621) and the second rack (622) are of equal length. A feed port and a booster pump are fixedly connected to the rear surface of the paint storage box (682). The air inlet end of the booster pump is fixedly connected to the paint storage box (682).

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