Automatic spraying device for three-proofing coating on surface of printed circuit board

Abstract

The utility model relates to the technical field of circuit board three-proofing coating spraying devices, in particular to a printed circuit board surface three-proofing coating automatic spraying device which comprises a support and a driving frame, the driving frame is installed on the upper surface of the support, a conveying belt is installed inside the driving frame, the conveying belt is connected with the surface of a driving portion of the driving frame in a sleeved mode, and the driving portion of the driving frame is connected with the driving portion of the driving frame in a sleeved mode. A shade is installed on the upper surface of the driving frame, an air pump is installed on the upper surface of the shade, a heater is installed at the output end of the air pump, a spraying mechanism is installed at the output end of the heater, a spraying part of the spraying mechanism is located in the shade, and an auxiliary assembly is arranged on the surface of the air pump. According to the utility model, the auxiliary assembly is arranged, so that when the equipment works, the surface of the circuit board before processing can be synchronously cleaned, the problems that dust is attached to the surface of the circuit board and the auxiliary energy of a coating is interfered are reduced, and the functionality and the processing quality of the equipment are further improved.

Description

Technical Field

[0001] This utility model relates to the technical field of conformal coating spraying device for printed circuit boards, and in particular to an automatic conformal coating spraying device for the surface of printed circuit boards. Background Technology

[0002] The circuit board conformal coating spraying device is a specialized device for spraying conformal coatings onto the surface of circuit boards. It is of great significance for improving the protective performance of circuit boards. This device can effectively protect circuit boards from moisture, dust, chemicals and other corrosive substances, extending the service life of circuit boards. It is widely used in the electronic equipment manufacturing industry and helps improve the quality of electronic products.

[0003] Existing technologies, such as the utility model patent with publication number CN218360033U, disclose a spraying device for conformal coating of circuit boards. This patent features a spraying device mounted above a conveying device, with the spraying device and conveying device fixedly connected by fastening screws. A pressurized heating box is mounted above the spraying device, and the pressurized heating box is fixedly connected to the spraying device by fastening screws. The spraying device has a two-in-one spray nozzle inside. An air collecting hood is mounted on one side of the pressurized heating box, and the air collecting hood is fixedly connected to the pressurized heating box by bolts. An air supply hose is installed between the air collecting hood and the two-in-one spray nozzle. Both the air collecting hood and the two-in-one spray nozzle are fixedly connected to the air supply hose by flanges. Support legs are installed below the conveying device. This addresses the problems of existing conventional spraying devices for conformal coating of circuit boards, which typically involve spraying first and then drying, resulting in low drying efficiency of the coating and low spraying pressure, leading to coating accumulation on the circuit board surface.

[0004] In the process of processing circuit boards using a spraying device, there is a problem that existing spraying equipment, such as the one mentioned above, directly feeds the circuit board into the processing area via a conveyor. During the transfer process, dust and other impurities in the air will adhere to the surface of the circuit board. When the equipment directly feeds the circuit board into the processing area via the conveyor, the impurities on the surface of the circuit board will interfere with the adhesion of the coating, resulting in insufficient coating adhesion strength in some areas and a reduced pass rate of the processed circuit boards. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the prior art where, when the equipment directly feeds the circuit board into the processing area through a conveying device, impurities attached to the surface of the circuit board interfere with the adhesion of the coating, resulting in insufficient coating adhesion strength in some areas and a reduced pass rate of the processed circuit board. The invention proposes an automatic three-proof coating spraying device for the surface of printed circuit boards.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an automatic spraying device for conformal coating on the surface of printed circuit boards, comprising a support and a drive frame, wherein the drive frame is mounted on the upper surface of the support, a conveyor belt is installed inside the drive frame, the conveyor belt is sleeved with the surface of the drive part of the drive frame, a cover is mounted on the upper surface of the drive frame, an air pump is mounted on the upper surface of the cover, a heater is mounted on the output end of the air pump, a spraying mechanism is mounted on the output end of the heater, the spraying part of the spraying mechanism is located inside the cover, and auxiliary components are provided on the surface of the air pump;

[0007] The auxiliary component includes an assembly cylinder, which is fixedly connected to the outer circumference of the air pump. The assembly cylinder is made of a metal material that can be attracted by a magnet. A connector is threaded onto the upper inner wall of the assembly cylinder. A connecting pipe is fixedly connected to the upper surface of the connector. A connecting flange is fixedly connected to the input end of the connecting pipe. A guide pipe is fixedly connected to the input end of the connecting flange. A dust suction cover is fixedly connected to the lower surface of the guide pipe. A retaining ring is fixedly connected to the inner wall of the assembly cylinder.

[0008] The auxiliary component also includes a connecting cylinder, which is installed on the inner wall of the assembly cylinder. A filter element one is fixedly connected to the inner wall of the connecting cylinder on the side closer to the air pump, and a mounting bracket is threadedly connected to the inner wall of the connecting cylinder on the side away from the air pump. A filter element two is fixedly connected to the inner wall of the mounting bracket, and a knob is fixedly connected to the side surface of the mounting bracket.

[0009] Preferably, the outer arc surface of the connecting cylinder has a groove, and an adsorption magnet is fixedly connected to the inner wall of the groove. The adsorption magnet is magnetically attracted to the inner arc surface of the assembly cylinder. The adsorption magnet can cooperate with the assembly cylinder to magnetically attract the position of the connecting cylinder to a designated area inside the assembly cylinder, thereby increasing the stability of the connecting cylinder during use.

[0010] Preferably, a guide strip is fixedly connected to the outer arc surface of the connecting cylinder, and a guide groove is provided on the inner wall of the assembly cylinder. The guide strip is slidably connected to the inner wall of the assembly cylinder. Through the cooperation of the guide strip and the guide groove, the installation direction of the connecting cylinder can be guided to ensure that the structure of the connecting cylinder will not be twisted during the installation process.

[0011] Preferably, the connector is connected to the interior of the assembly cylinder, the connector is connected to the interior of the connecting pipe, and the connecting pipe is connected to the interior of the connecting flange. The assembly cylinder and the connecting pipe can be connected through the connector so that the suction force generated by the assembly cylinder can extract the air in the connecting pipe.

[0012] Preferably, the dust suction hood is fixedly connected to the inner wall of the shield, and the dust suction hood is connected to the inside of the guide tube. Through the dust suction hood, when the air pump is working, suction is generated by the cooperation of the assembly cylinder, connector, connecting pipe, connecting flange and guide tube to suck up dust and other attached objects on the surface of the circuit board below it.

[0013] Preferably, the upper surface of the connecting cylinder is provided with a through hole, which is located directly below the connector. The through hole is connected to the interior of the connector, and the connector and the connecting cylinder can be connected through the through hole so that the dust-containing gas extracted by the connector can enter the connecting cylinder and be filtered by the connecting cylinder and filter screens 1 and 2.

[0014] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0015] In this invention, by setting auxiliary components, the equipment can simultaneously clean the surface of the circuit board before processing during operation, thereby reducing the problem of dust adhering to the surface of the circuit board and interfering with the auxiliary energy of the coating, and further improving the functionality and processing quality of the equipment. Attached Figure Description

[0016] Figure 1 A three-dimensional structural schematic diagram of an automatic spraying device for conformal coating on the surface of printed circuit boards is provided for this utility model.

[0017] Figure 2 This utility model provides a schematic diagram of the placement device for an automatic spraying device for conformal coating on the surface of printed circuit boards.

[0018] Figure 3 A partial structural schematic diagram of the automatic spraying device for conformal coating on the surface of printed circuit boards proposed in this utility model;

[0019] Figure 4 This utility model provides a schematic diagram of the auxiliary component structure of an automatic spraying device for conformal coating on the surface of printed circuit boards.

[0020] Figure 5 This invention presents a schematic diagram of some auxiliary components of an automatic conformal coating spraying device for printed circuit board surfaces.

[0021] Legend:

[0022] 1. Bracket; 2. Drive frame; 3. Conveyor belt; 4. Cover; 5. Air pump; 6. Heater; 7. Spraying mechanism; 8. Auxiliary components; 81. Assembly cylinder; 82. Connector; 83. Connecting pipe; 84. Connecting flange; 85. Guide pipe; 86. Dust hood; 87. Retaining ring; 88. Connecting cylinder; 89. Filter element one; 810. Mounting bracket; 811. Filter element two; 812. Knob; 813. Groove; 814. Adsorption magnet; 815. Guide strip; 816. Guide groove. Detailed Implementation

[0023] Please see Figures 1-5 This utility model provides a technical solution: an automatic spraying device for conformal coating on the surface of printed circuit boards, including a bracket 1 and a drive frame 2. The drive frame 2 is installed on the upper surface of the bracket 1. A conveyor belt 3 is installed inside the drive frame 2. The conveyor belt 3 is sleeved with the surface of the drive part of the drive frame 2. A cover 4 is installed on the upper surface of the drive frame 2. An air pump 5 is installed on the upper surface of the cover 4. A heater 6 is installed at the output end of the air pump 5. A spraying mechanism 7 is installed at the output end of the heater 6. The spraying part of the spraying mechanism 7 is located inside the cover 4. An auxiliary component 8 is provided on the surface of the air pump 5.

[0024] In this embodiment: the auxiliary component 8 includes an assembly cylinder 81, which is fixedly connected to the outer circumference of the air pump 5. The assembly cylinder 81 is made of a metal material that can be attracted by a magnet. The upper inner wall of the assembly cylinder 81 is threaded with a connector 82. The upper surface of the connector 82 is fixedly connected with a connecting pipe 83. The input end of the connecting pipe 83 is fixedly connected with a connecting flange 84. The input end of the connecting flange 84 is fixedly connected with a guide pipe 85. The lower surface of the guide pipe 85 is fixedly connected with a dust suction cover 86. The inner wall of the assembly cylinder 81 is fixedly connected with a retaining ring 87.

[0025] The auxiliary component 8 also includes a connecting cylinder 88, which is installed on the inner wall of the assembly cylinder 81. A filter element 89 is fixedly connected to the inner wall of the connecting cylinder 88 on the side closer to the air pump 5. A mounting bracket 810 is threadedly connected to the inner wall of the connecting cylinder 88 on the side away from the air pump 5. A filter element 811 is fixedly connected to the inner wall of the mounting bracket 810. A knob 812 is fixedly connected to the side surface of the mounting bracket 810.

[0026] Specifically, the outer arc surface of the connecting cylinder 88 is provided with a groove 813, and an adsorption magnet 814 is fixedly connected to the inner wall of the groove 813. The adsorption magnet 814 is magnetically attracted to the inner arc surface of the assembly cylinder 81, and can cooperate with the assembly cylinder 81 through the adsorption magnet 814.

[0027] In this embodiment, the position of the connecting cylinder 88 is magnetically attracted to a designated area inside the assembly cylinder 81 by the adsorption magnet 814, thereby increasing the stability of the connecting cylinder 88 during use.

[0028] Specifically, a guide strip 815 is fixedly connected to the outer arc surface of the connecting cylinder 88, and a guide groove 816 is provided on the inner wall of the assembly cylinder 81. The guide strip 815 is slidably connected to the inner wall of the assembly cylinder 81. Through the cooperation of the guide strip 815 and the guide groove 816, the installation direction of the connecting cylinder 88 can be guided to ensure that the structure of the connecting cylinder 88 will not be twisted during the installation process.

[0029] In this embodiment: the connector 82 is connected to the interior of the assembly cylinder 81, the connector 82 is connected to the interior of the connecting pipe 83, and the connecting pipe 83 is connected to the interior of the connecting flange 84.

[0030] In this embodiment: the assembly cylinder 81 and the connecting pipe 83 can be connected through the connector 82 so that the suction force generated by the assembly cylinder 81 can extract the air in the connecting pipe 83.

[0031] Specifically, the dust hood 86 is fixedly connected to the inner wall of the shield 4, and the dust hood 86 is connected to the inside of the guide tube 85. Through the dust hood 86, when the air pump 5 is working, suction is generated by the cooperation of the assembly cylinder 81, the connector 82, the connecting tube 83, the connecting flange 84 and the guide tube 85 to suck up dust and other attached objects on the surface of the circuit board below it.

[0032] Specifically, the upper surface of the connecting cylinder 88 is provided with a through hole, which is located directly below the connector 82 and is connected to the interior of the connector 82.

[0033] In this embodiment: the connector 82 and the connecting cylinder 88 can be connected through the through hole so that the dust-containing gas drawn by the connector 82 can enter the connecting cylinder 88 and filter the dust in the air with the assistance of the connecting cylinder 88 and the first and second filters.

[0034] Working principle: During processing, the drive frame 2 is powered on and the switch of the drive frame 2 is turned on. The drive frame 2 is powered on and drives the conveyor belt 3 to rotate. When the conveyor belt 3 rotates, the point for pumping the coating is connected to the spraying mechanism 7, and the air pump 5 and heater 6 are powered on. The air pump 5 sends the pumped air into the heater 6, the heater 6 heats the air and sends it into the spraying mechanism 7 to assist the spraying mechanism 7 in its work. Then, the printed circuit board is placed on the conveyor belt 3 manually or by a feeding device. The conveyor belt 3 sends the printed circuit board from the direction of the auxiliary component 8 into the shield 4. When the circuit board passes through the spraying part of the spraying mechanism 7, the spraying mechanism 7 sprays the coating onto the surface of the circuit board. The processed circuit board is sent out by the conveyor belt 3.

[0035] When the air pump 5 is working, the air inlet of the air pump 5 draws air. The assembly cylinder 81 installed at the air inlet of the air pump 5 draws in the outside air under the action of the air pump 5. When the assembly cylinder 81 draws in the air, it works with the connecting cylinder 88, the connector 82, the connecting pipe 83, the connecting flange 84 and the guide pipe 85 to draw in the air at the dust suction hood 86, so that the dust suction hood 86 generates suction. When the circuit board moves to the bottom of the dust suction hood 86, the dust on the surface of the circuit board is sucked away under the suction of the dust suction hood 86. Under the guidance of the guide pipe 85, the connecting flange 84, the connecting pipe 83 and the connector 82, it follows the air into the storage area composed of the assembly cylinder 81, the first filter element 89, the mounting bracket 810 and the second filter element 811. The dust in the air is filtered by the first filter element 89, and then the filtered air is pumped to the heater 6 by the air pump 5.

[0036] When staff need to clean the dust in the storage area, pull knob 812 outward. Knob 812, in conjunction with mounting bracket 810, pulls connecting cylinder 88 and filter element 1 89. Guided by guide strip 815 and guide groove 816, connecting cylinder 88 pulls the adsorption magnet 814 and gradually detaches from assembly cylinder 81. After connecting cylinder 88 is completely removed, hold connecting cylinder 88 and rotate knob 812 counterclockwise. Knob 812 rotates mounting bracket 810, which in turn drives filter element 2 811 to gradually unscrew from connecting cylinder 88. After the mounting bracket 810 is removed, the connecting cylinder 88 is opened, and dust and other impurities inside the connecting cylinder 88 can be removed. After cleaning, the above steps are reversed, and the through hole is aligned with the position of the connector 82. The connecting cylinder 88 is then reinstalled into the assembly cylinder 81. By setting the auxiliary component 8, the surface of the circuit board before processing can be cleaned simultaneously during operation, thereby reducing the problem of dust adhering to the surface of the circuit board and interfering with the auxiliary energy of the coating, and further improving the functionality and processing quality of the equipment.

Claims

1. An automatic spraying device for printed circuit board surface three-proofing coating, comprising a support (1) and a driving frame (2), characterized in that: The driving frame (2) is installed on the upper surface of the support (1), the inside of the driving frame (2) is provided with a conveying belt (3), the conveying belt (3) is sleeved with the surface of the driving part of the driving frame (2), the upper surface of the driving frame (2) is provided with a cover (4), the upper surface of the cover (4) is provided with an air pump (5), the output end of the air pump (5) is provided with a heater (6), the output end of the heater (6) is provided with a spraying mechanism (7), the spraying part of the spraying mechanism (7) is located in the inside of the cover (4), and the surface of the air pump (5) is provided with an auxiliary assembly (8). The auxiliary assembly (8) comprises an assembly cylinder (81), the assembly cylinder (81) is fixedly connected with the outer circumference of the air pump (5), a joint (82) is threadedly connected to the inner wall of the assembly cylinder (81), a connecting pipe (83) is fixedly connected to the upper surface of the joint (82), a connecting flange (84) is fixedly connected to the input end of the connecting pipe (83), a guide pipe (85) is fixedly connected to the input end of the connecting flange (84), a dust suction cover (86) is fixedly connected to the lower surface of the guide pipe (85), and a blocking ring (87) is fixedly connected to the inner wall of the assembly cylinder (81). The auxiliary assembly (8) further comprises a connecting cylinder (88), the connecting cylinder (88) is installed on the inner wall of the assembly cylinder (81), a filter element one (89) is fixedly connected to the inner wall of the connecting cylinder (88) close to the air pump (5), an installation frame (810) is threadedly connected to the inner wall of the connecting cylinder (88) away from the air pump (5), a filter element two (811) is fixedly connected to the inner wall of the installation frame (810), and a knob (812) is fixedly connected to the side surface of the installation frame (810).

2. The automatic spraying device for printed wiring board surface three-proofing coating according to claim 1, characterized in that: The outer arc surface of the connecting cylinder (88) is provided with a groove (813), the inner wall of the connecting cylinder (88) in the groove (813) is fixedly connected with an adsorbing magnet (814), and the adsorbing magnet (814) is magnetically attracted to the inner arc surface of the assembly cylinder (81).

3. The automatic spraying device for printed wiring board surface three-protection coating according to claim 1, characterized in that: The outer arc surface of the connecting cylinder (88) is fixedly connected with a guide strip (815), the inner wall of the assembly cylinder (81) is provided with a guide groove (816), and the guide strip (815) is slidingly connected with the inner wall of the assembly cylinder (81).

4. The automatic spraying device for printed wiring board surface three-proofing coating according to claim 1, characterized in that: The joint (82) is communicated with the inside of the assembly cylinder (81), the joint (82) is communicated with the inside of the connecting pipe (83), and the connecting pipe (83) is communicated with the inside of the connecting flange (84).

5. The automatic spraying device for printed wiring board surface three-proofing coating according to claim 1, characterized in that: The dust suction cover (86) is fixedly connected with the inner wall of the cover (4), and the dust suction cover (86) is communicated with the inside of the guide pipe (85).

6. The automatic spraying device for printed wiring board surface three-proofing coating according to claim 1, characterized in that: The upper surface of the connecting cylinder (88) is provided with a through hole, the through hole is located directly below the joint (82), and the through hole is communicated with the inside of the joint (82).

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