Circuit board surface coating device for circuit board production

Abstract

The invention relates to the related technical field of coating equipment, discloses a circuit board surface coating device for circuit board production, and aims to solve the problem that a coating device is easily polluted due to exposure to an external environment. A coating box and a drying box are adjacently arranged, so that a circuit board is positioned in a specific cavity during coating and drying; when pure air filtered by the air filtering cylinder sequentially passes through the drying box and the coating box through the axial flow fan blades, airflow always keeps one-way circulation, the drying effect on the coated circuit board can be achieved, dust particles on the surface of the to-be-coated circuit board are blown out through the one-way airflow, gathering of the dust particles on the circuit board is reduced, and the coating efficiency is improved. In this way, the coating quality is improved, and finally the effect that airflow flows in the device in a one-way mode after being purified is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field related to coating equipment, and in particular to a circuit board surface coating device for circuit board production. Background Art

[0002] Circuit board surface coating equipment plays an important role in the electronics manufacturing industry. It is not only responsible for evenly coating a layer of protective material (such as conformal coating, UV glue, etc.) on the surface of the circuit board to enhance the circuit board's moisture-proof, dust-proof, and corrosion-proof properties, thereby improving its stability and reliability, but also plays a key role in ensuring production efficiency and product quality.

[0003] After searching, it can be known that the announcement number CN219898767U discloses a circuit board surface coating device, including: a workbench, a mounting frame is fixedly installed on the top surface of the workbench, a liquid storage tank is arranged on the inner bottom surface of the mounting frame, and a controller is fixedly installed on one side of the workbench; an air-drying component, which is arranged on the top surface of the workbench for air drying.

[0004] However, in actual applications, since the entire device is exposed to the external environment and lacks necessary protection measures, dust and other particles in the environment are easily attached to the circuit board during the air drying and coating process. These particles will not only affect the uniformity and quality of the coating, but may also cause uneven surface quality of the circuit board and even reduce the yield rate of the final product. More specifically, when a fan is used to blow external air to the coated circuit board to accelerate drying, this operation may in turn aggravate the movement of dust particles in the environment to the circuit board, further deteriorating the coating effect. Therefore, how to effectively prevent the pollution of dust and other particles has become a problem that needs to be solved urgently. Summary of the invention

[0005] The present invention proposes a circuit board surface coating device for circuit board production, which has the advantage of achieving unidirectional flow of airflow inside the device after purification, and is intended to solve the problem that the coating device mentioned in the above background technology is easily contaminated due to exposure to the external environment.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A circuit board surface coating device for circuit board production, including a frame, a servo motor fixedly installed on the frame, and a conveyor belt driven by the servo motor. It further includes: A support base is fixedly installed on the frame. Upper and lower material openings are provided on both the left and right sides of the support base, and a coating box and a drying box are installed on the top. The conveyor belt penetrates through the inner cavities of the coating box and the drying box; A coating assembly is arranged in the coating box; An axial flow fan blade driven by an air drying motor is arranged in the drying box. A filter gas cylinder is threadedly connected to the outside of the drying box, and a filter gas assembly is arranged inside the filter gas cylinder; The downward airflow generated by the axial flow fan blade makes the chamber between the coating box and the drying box form a positive pressure, forcing the airflow to be unidirectionally discharged from the left and right openings of the support base, forming a continuous and pure airflow.

[0007] Further, a plurality of groups of positioning components are arranged at equal intervals on the surface of the conveyor belt.

[0008] Further, an input door is hinged to the left side of the support base, and an output door is hinged to the right side. The input door and the output door can seal the openings of the support base.

[0009] Further, a cylinder is fixedly installed on the top of the drying box. The output end of the cylinder is connected to a traction ring frame. The traction ring frame is movably connected to an air isolation outer sleeve through a guide rod. The air isolation outer sleeve is hermetically and slidably connected to the inner wall of the drying box, and a lifting spring sleeved outside the guide rod is arranged between the air isolation outer sleeve and the traction ring frame.

[0010] Further, the bottom end of the guide rod is fixedly connected to an air isolation cylinder. The air drying motor is fixed to the middle of the air isolation cylinder through a bracket, and an electric heating ring is arranged at the bottom of the air isolation cylinder.

[0011] Further, the air isolation cylinder is a cylindrical barrel structure with a through middle part.

[0012] Further, a cleaning and blocking piston seat is hermetically and movably sleeved inside the filter gas cylinder. An annular arc groove is provided on the outside of the cleaning and blocking piston seat. An air intake control rod with a return spring is movably installed in the middle, and a gas cut-off disc is fixedly connected to the side of the air intake control rod; A limiting spring push rod is movably installed on the outside of the filter gas cylinder. When the limiting spring push rod abuts against the annular arc groove on the outside of the cleaning and blocking piston seat, it can limit the movement resistance when the two are separated.

[0013] Further, a stop frame is fixedly connected to the top of the traction ring frame, and the stop frame restricts the axial movement of the air intake control rod.

[0014] Further, the output shaft of the air drying motor extends above the traction ring frame and is connected to an alarm platform. Lugs are fixedly arranged on the outside of the alarm platform.

[0015] Further, a top door spring is connected between the output door and the drying box. An alarm push frame is connected to the end of the air intake control rod. When the alarm push frame compresses the top door spring to a set stroke, the output door is triggered to open.

[0016] The present invention has the following beneficial effects:

[0017] A circuit board surface coating device for circuit board production provided by the present invention uses the adjacent layout of a coating box and a drying box to construct a connected chamber for coating and drying. In this chamber, the circuit board can smoothly complete the whole process from coating to drying, effectively avoiding the interference of external pollutants.

[0018] The device is internally equipped with axial flow fan blades, which drive the purified air filtered through the air filter cylinder, thereby forming a continuous one-way air flow between the drying box and the coating box. This design not only ensures that the circuit board can be quickly and evenly dried after coating, but also cleverly utilizes the characteristics of the one-way air flow to blow the dust particles on the surface of the circuit board to be coated outwards, thereby reducing the accumulation of dust on the circuit board, and thus improving the coating accuracy and quality.

[0019] Through this ingenious air flow design, the internal air flow of the device is comprehensively purified and unidirectionally circulated, effectively ensuring the cleanliness and stability of the coating and drying environment. This innovation not only solves the problem that traditional coating devices are easily polluted by the external environment, but also provides solid technical support for the high-quality production of circuit boards. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings forming a part of the specification depict the embodiments disclosed by the present invention and, together with the specification, are used to explain the principles disclosed by the present invention.

[0021] Referring to the drawings, the present invention can be more clearly understood according to the following detailed description, wherein:

[0022] Figure 1 is a schematic external three-dimensional structure diagram of the whole of the present invention;

[0023] Figure 2 is a schematic internal planar structure diagram of the present invention;

[0024] Figure 3 is Figure 2 an enlarged structure diagram at position E in

[0025] Figure 4 is a schematic diagram of the positions and three-dimensional structures of the components inside the drying box of the present invention;

[0026] Figure 5 is a schematic three-dimensional structure diagram of the alarm desk of the present invention;

[0027] Figure 6 is a schematic diagram of the state when the positioning rod fixes the circuit board of the present invention.

[0028] In the figure: 1, frame; 2, servo motor; 3, conveyor belt; 300, positioning component; 4, support base; 401, input door; 402, output door; 403, top door spring; 5, coating box; 500, coating component; 6, drying box; 7, air filter cartridge; 8, controller; 9, cylinder; 10, traction ring frame; 11, air separation cylinder; 110, lifting spring; 12, air separation outer sleeve; 13, air drying motor; 14, axial flow fan blade; 15, alarm console; 150, lug; 16, stop frame; 17, air intake control rod; 170, return spring; 171, air cut-off disc; 18, blockage clearing piston seat; 19, limit spring push rod; 20, air filter component; 21, electric heating ring; 22, alarm push frame. Specific implementation mode

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0030] Embodiment 1, please refer to Figure 1 It can be seen that a servo motor 2 for precisely driving the conveyor belt 3 is fixedly installed on the frame 1. By controlling the servo motor 2, the conveyor belt 3 is precisely conveyed forward. In order to prevent the circuit board from moving during the conveying process, combined with Figure 1 and Figure 6 It can be seen that multiple groups of positioning components 300 are arranged equidistantly on the surface of the conveyor belt 3. Each group of positioning components 300 is composed of four positioning rods. By restricting the circuit board with the positioning rods, the circuit board is relatively stable during the conveying process.

[0031] The support base 4 is fixedly installed above the frame 1 by using a bracket. Combined with Figure 1 and Figure 2It can be seen that a coating box 5 and a drying box 6 are installed side by side on the top of the support base 4. The side of the conveyor belt 3 is located inside the coating box 5 and the drying box 6, and the inner cavities of the coating box 5 and the drying box 6 are interconnected. A coating assembly 500 is provided in the coating box 5. Among them, the coating assembly 500 mainly includes a nozzle for spraying the protective material outwards, a driving mechanism for moving, and so on. After the positioned and clamped circuit board is conveyed below the coating assembly 500, the surface of the circuit board is coated by using the nozzle in the coating assembly 500. When the coating work is completed, the servo motor 2 controls the conveyor belt 3 to continue to rotate clockwise, so that the coated circuit board moves into the drying box 6, and the drying box 6 blows the external pure air flow onto the circuit board to realize the air drying of the circuit board. In the above process, the coating and drying of the circuit board are carried out in the corresponding working chambers. Therefore, the pollution of the circuit board by dust in the external environment is greatly reduced.

[0032] Moreover, as can be seen from Figure 2 and Figure 4 an axial flow fan blade 14 driven by an air drying motor 13 is provided in the drying box 6. When the air drying motor 13 drives the axial flow fan blade 14 to rotate, the air flow in the inner cavity of the drying box 6 will be blown downward and act on the circuit board that has been coated at the bottom of the inner cavity of the drying box 6. In order to ensure that the input air flow is relatively pure, a filter cylinder 7 communicating with the inner cavity of the drying box 6 is threadedly connected to the outside of the drying box 6, and a filter assembly 20 is provided inside the filter cylinder 7. Among them, the filter assembly 20 includes a filter screen, a lime drying plate, an activated carbon adsorption plate, etc., to ensure that after the external air flow passes through the filter screen, the lime drying plate and the activated carbon adsorption plate in sequence, the external air can be purified, so that the air flow input into the inner cavity of the drying box 6 is relatively pure.

[0033] In the actual application process of the first embodiment, as shown in Figure 2 a controller 8 fixed on the outside of the coating box 5 is used for regulation and control, so that the air drying motor 13 and the servo motor 2 work synchronously. The air drying motor 13 drives the axial flow fan blade 14 to rotate and generates a continuously downward blowing air flow. For the input of the air flow, after the external air flow passes through the filter assembly 20, the air flow can be purified, so that the air flow input into the inner cavity of the drying box 6 is relatively pure. The air flow blown downward by the axial flow fan blade 14 will cause the air volume in the chamber between the coating box 5 and the drying box 6 to increase, forcing the air flow to be discharged outwards from the openings on the left and right sides of the support base 4 (the openings are mainly used for feeding and discharging). During this process, a continuously pure air flow flowing unidirectionally outwards is generated in both the coating box 5 and the drying box 6.

[0034] Afterwards, after the circuit board is positioned by the positioning assembly 300, the servo motor 2 drives the conveyor belt 3 to rotate clockwise, so that the circuit board on the positioning assembly 300 first enters the coating box 5 and is located below the coating assembly 500, and the servo motor 2 stops working. During this process, since the air flow in the inner cavity of the coating box 5 is continuously discharged to the left, when the circuit board is conveyed into the inner cavity of the coating box 5, the air flow blows the circuit board, so that the dust falling on the surface of the circuit board is blown out, avoiding the influence of dust on the subsequent coating work. After the coating is completed, the servo motor 2 is used to drive the conveyor belt 3 to move again, so that the coated circuit board moves below the axial flow fan blade 14 and is air-dried. At the same time, the next circuit board is also conveyed below the coating assembly 500. Finally, the air-drying and coating work are carried out synchronously.

[0035] Embodiment 2 is a further improvement based on Embodiment 1. In order to prevent air flow disturbance at the bottom of the coating assembly 500 during spraying, resulting in uneven spraying, please refer to Figure 1 and Figure 2 It can be seen that an input door 401 is hinged to the left side of the support base 4, and the opening and closing of the input door 401 can block the left opening of the support base 4; similarly, an output door 402 is hinged to the right side of the support base 4, and the output door 402 can block the right opening of the support base 4. When the input door 401 and the output door 402 close their left and right openings by gravity, the inner cavities of the coating box 5 and the drying box 6 are relatively isolated from the outside, preventing external dust and the like from contaminating the circuit board.

[0036] At the same time, in combination with Figure 2 and Figure 4 It can be seen that a cylinder 9 is fixedly installed on the inner top of the drying box 6, and a traction ring frame 10 is fixedly installed at the output end of the cylinder 9. The traction ring frame 10 can be controlled by the cylinder 9 to move up and down reciprocally. There is an air isolation outer sleeve 12 movably installed at the bottom of the traction ring frame 10 by a guide rod. The outer side of the air isolation outer sleeve 12 is hermetically slidably connected to the inner wall of the drying box 6, and a lifting spring 110 is connected between the air isolation outer sleeve 12 and the traction ring frame 10 outside the guide rod. The bottom end of the guide rod is fixedly installed with an air isolation cylinder 11 located in the inner cavity of the air isolation outer sleeve 12, and the air isolation cylinder 11 is a cylindrical cylinder with a through middle. From Figure 4It can be seen that the air-drying motor 13 is fixed in the middle of the air separation cylinder 11 by means of a bracket, and the rotation center line of the axial-flow fan blade 14 is made coaxial with the central axis of the air separation cylinder 11. Under normal conditions, the traction ring frame 10 and the air separation outer sleeve 12 are pushed away from each other by the elastic force of the lifting spring 110 until the top of the air separation cylinder 11 abuts against the inner side of the air separation outer sleeve 12. When the air cylinder 9 pulls the traction ring frame 10 upward, the traction ring frame 10 will drive the air separation cylinder 11 and the air separation outer sleeve 12 to move upward synchronously; similarly, when the air cylinder 9 pushes the traction ring frame 10 downward, the air separation cylinder 11 and the air separation outer sleeve 12 move downward synchronously. After the air separation outer sleeve 12 moves downward and abuts against the conveyor belt 3, the continuously downward moving traction ring frame 10 will push the air separation cylinder 11 downward, causing the separation between the top of the air separation cylinder 11 and the air separation outer sleeve 12.

[0037] In the actual application of the second embodiment, under normal conditions, the air cylinder 9 pulls the air separation cylinder 11 and the air separation outer sleeve 12 upward through the traction ring frame 10. At this time, the air separation outer sleeve 12 moves away from the conveyor belt 3. When the air-drying motor 13 drives the axial-flow fan blade 14 to rotate, the external air flow is blown into the inner cavities of the coating box 5 and the drying box 6, and the air flow synchronously pushes the input door 401 and the output door 402 to deflect outward, realizing the one-way flow of the air flow from the openings on both sides of the support seat 4.

[0038] After that, the conveyor belt 3 is driven to rotate by the servo motor 2, so that the circuit board fixed by the positioning assembly 300 moves below the coating assembly 500 for coating. After the coating is completed, the circuit board below the coating assembly 500 is conveyed below the axial-flow fan blade 14. After that, the air cylinder 9 is used to push the traction ring frame 10 downward, thereby causing the air separation outer sleeve 12 and the air separation cylinder 11 to move downward synchronously. Figure 2 It can be seen that the downward moving air separation outer sleeve 12 will first contact the conveyor belt 3, and the entire bottom of the air separation outer sleeve 12 is pressed on the conveyor belt 3, making the inner cavity of the air separation outer sleeve 12 relatively separated from the outside. At this time, the coated circuit board is completely placed in the inner cavity of the air separation outer sleeve 12. As the air cylinder 9 moves further downward until the limit convex ring in the middle of the guide rod abuts against the top of the air separation outer sleeve 12. At this time, the air separation cylinder 11 has moved downward and separated from the top inner side of the air separation outer sleeve 12, and the lifting spring 110 has been compressed.

[0039] Afterwards, since the air-separating jacket 12 descends and presses the conveyor belt 3, the air flow in the inner cavity of the drying box 6 will not be discharged outward, so there is no continuous air flow outwardly transported in the coating box 5. The input door 401 and the output door 402 close under their own gravity, making the inner cavities of the coating box 5 and the drying box 6 relatively sealed. This ensures that during the coating process of the coating assembly 500, there is not only a relatively airtight space but also the coating work is prevented from being disturbed by the flowing air current. At the same time, as the air-drying motor 13 drives the axial flow fan blade 14 to continuously rotate, the air flow blown downward by the axial flow fan blade 14 directly acts on the circuit board that has been coated below. At this time, the air flow cannot be discharged outward. Combining with the air flow above the axial flow fan blade 14 being transported downward, the air flow in the inner cavity of the air-separating jacket 12 circulates up and down, thereby realizing the air-drying of the coated circuit board. During this process, since the air flow inside the circuit board circulates independently during the air-drying process, there is no need for the air filtration assembly 20 to continuously filter air, thus reducing the filtration pressure on the air filtration assembly 20 and further extending the service life of the lime board and the activated carbon board in the air filtration assembly 20.

[0040] When the circuit board in the air-drying and coating box 5 is completely coated, the air cylinder 9 drives the traction ring frame 10 to pull upward, causing the air-separating jacket 12 to ascend and return to its initial position. The axial flow fan blade 14 conveys the air flow downward again and discharges it from the openings on both sides of the support seat 4. After that, it works again according to the above method to realize the continuous coating and air-drying of the circuit board.

[0041] On this basis, in order to enhance the air-drying efficiency, from Figure 2 and Figure 4 It can be seen that an electric heating ring 21 is fixedly installed at the inner bottom of the air-separating cylinder 11. When the heat generated after the electric heating ring 21 is turned on is blown by the axial flow fan blade 14, it can further accelerate the air-drying of the coated circuit board below the axial flow fan blade 14, thereby increasing the air-drying efficiency of the coated circuit board.

[0042] Embodiment 3 is a further improvement based on Embodiment 2. Please refer to Figures 2 - 4 It can be seen that a clogging-clearing piston seat 18 is hermetically and movably sleeved inside the air filtration cylinder 7. The cross-sectional shape of the clogging-clearing piston seat 18 is in the shape of a "T", and the clogging-clearing piston seat 18 and the air filtration cylinder 7 are coaxially arranged. As Figure 3 shown, a limiting spring push rod 19 is movably installed outside the air filtration cylinder 7. The limiting spring push rod 19 is composed of a spring and a push rod. Under normal conditions, the push rod is pushed by the spring and abuts against the annular arc groove outside the clogging-clearing piston seat 18, thereby restricting the movement resistance when the annular arc groove disengages from the limiting spring push rod 19.

[0043] An air inlet control rod 17 is movably installed in the middle of the clog-removing piston seat 18, and a return spring 170 is connected between the air inlet control rod 17 and the clog-removing piston seat 18. A cut-off disc 171 is fixedly installed on the side of the air inlet control rod 17. Under normal conditions, the air inlet control rod 17 drives the cut-off disc 171 to move away from the drying box 6 under the elastic force of the return spring 170 until the cut-off disc 171 abuts against the middle part inside the clog-removing piston seat 18, thereby restricting the communication between the inner cavity of the air filter cylinder 7 and the inner cavity of the drying box 6. Similarly, when the cut-off disc 171 moves away from the air filter cylinder 7 and compresses the return spring 170, the cut-off disc 171 releases the blockage of the middle part of the clog-removing piston seat 18, enabling the drying box 6 and the air filter cylinder 7 to communicate with each other. During this process, in order to restrict the movement of the air inlet control rod 17 into the inner cavity of the drying box 6, a stop frame 16 is fixedly connected by bolts at the top of the traction ring frame 10. By using the stop of the stop frame 16 against the end of the air inlet control rod 17, the further movement of the air inlet control rod 17 into the inner cavity of the drying box 6 is restricted.

[0044] On this basis, combined with Figure 2 、 Figure 4 and Figure 5 it can be seen that an alarm platform 15 is fixedly installed on the output shaft of the air-drying motor 13 above the traction ring frame 10. The shape of the alarm platform 15 is frustum-shaped, and a lug 150 is fixedly connected to the outer side of the alarm platform 15. When the alarm platform 15 drives the axial flow fan blade 14 to rotate, it can synchronously drive the alarm platform 15 and the lug 150 to perform rotational motion. From Figure 1 and Figure 2 it can be seen that a top door spring 403 is connected between the output door 402 and the outer side of the drying box 6. Under normal conditions, the output door 402 is always in a closed state under the elastic force of the top door spring 403. The end of the air inlet control rod 17 is fixedly connected by bolts with an alarm push frame 22. The shape of the alarm push frame 22 is "L". When the air inlet control rod 17 drives the alarm push frame 22 to move to the left and the alarm push frame 22 abuts against the output door 402 and compresses the top door spring 403, it will force the output door 402 to open.

[0045] When the third embodiment is actually applied, as Figure 2As shown, under normal conditions, the air cylinder 9 lifts the traction ring frame 10 upward to the top limit. At this time, the top of the air separation cylinder 11 abuts against the inner top of the air separation outer sleeve 12. The air drying motor 13 drives the axial flow fan blade 14 and the alarm console 15 to rotate synchronously. The rotating axial flow fan blade 14 blows the air flow in the inner cavity of the drying box 6 downward. The reduction of the air pressure in the upper inner cavity of the drying box 6 causes the intake control rod 17 to move to the left and compress the return spring 170 until the left end of the intake control rod 17 abuts against the stop frame 16. Since the air flow pressure in the upper inner cavity of the drying box 6 is relatively low, the external air flow enters the inner cavity of the drying box 6 from the middle of the clogging clearing piston seat 18 after being filtered and purified by the air filtering assembly 20. The air flow is blown downward by the axial flow fan blade 14. Since the output door 402 is pushed by the elastic force of the top door spring 403, the opening force of the output door 402 is relatively greater than the opening force of the left input door 401, resulting in most of the air flow flowing to the left. When the air flow blows to the left, it can blow the circuit board input from the left opening of the support seat 4, and blow the dust on the surface of the circuit board to the outside.

[0046] After the circuit board is coated, the circuit board entering below the axial flow fan blade 14 will be air-dried. During this process, the air cylinder 9 is used to push the traction ring frame 10 downward, so that the air separation outer sleeve 12 is first pressed on the conveyor belt 3, and the inner cavity of the air separation outer sleeve 12 and the inner cavity of the drying box 6 are relatively sealed from the outside. As the air cylinder 9 further pushes the traction ring frame 10 downward, the top of the air separation cylinder 11 is separated from the inner top of the air separation outer sleeve 12. Then, when the air drying motor 13 drives the axial flow fan blade 14 to rotate, the air flow is blown downward and directly acts on the coated circuit board after being heated by the electric heating ring 21, realizing the air-drying of the circuit board. As the hot air circulates up and down in the inner cavity of the air separation outer sleeve 12, it ensures that the circuit board always maintains a relatively sealed state during air-drying.

[0047] After that, during the air-drying process, if there is no airtight leakage in the air isolation jacket 12, the axial-flow fan blade 14 will circulate the air in the air isolation jacket 12 up and down, and there is no need for the filter cartridge 7 to supplement air. The intake control rod 17, under the elastic force of the return spring 170, causes the air cut-off disc 171 to block the middle part of the clog-removing piston seat 18. Along with the heating of the air in the inner cavity of the air isolation jacket 12 by the electric heating ring 21, the air in the inner cavity of the drying box 6 is synchronously heated, and according to the principle of thermal expansion and contraction, the air pressure in the inner cavity of the drying box 6 gradually increases. When the air pressure overcomes the moment when the clog-removing piston seat 18 breaks away from the limiting spring push rod 19, the clog-removing piston seat 18 is forced to push to the right, and the air flow on the right side of the clog-removing piston seat 18 will be quickly pushed in the reverse direction from the filter assembly 20. The generated recoil air flow is used to reduce the blockage of the filter assembly 20, and the impurities accumulated on the outer side of the filter assembly 20 are blown outwards to avoid the problem of air flow blockage caused by impurity accumulation. Then, when the circuit board is air-dried, the filter cartridge 7 drives the air isolation jacket 12 to move upward, and the axial-flow fan blade 14 blows the air flow in the inner cavity of the drying box 6 downward, so the filter cartridge 7 needs to supplement air flow into the inner cavity of the drying box 6. Since the prerequisite for air flow supplementation is that the air cut-off disc 171 compresses the return spring 170, as the pressure in the upper inner cavity of the drying box 6 decreases, the air cut-off disc 171 will drag the clog-removing piston seat 18 to move back to the left until the limiting spring push rod 19 abuts against the annular groove on the outer side of the clog-removing piston seat 18 again. After that, as the pressure in the inner cavity of the drying box 6 further decreases, the intake control rod 17 compresses the return spring 170, so that the drying box 6 and the filter cartridge 7 are interconnected. Finally, the coating and air-drying work are carried out again according to the above content.

[0048] If there is a leakage in the air isolation jacket 12 during the air drying process, at this time, after the cylinder 9 presses the traction ring frame 10 down to the limit, the stop frame 16 is disengaged from the air intake control rod 17, and the lug 150 is at the same horizontal height as the central axis of the air intake control rod 17. When the air isolation jacket 12 leaks, it will cause the air flow to leak into the coating box 5. The pressure in the inner cavity of the drying box 6 decreases, causing the air intake control rod 17 to further compress the return spring 170. At this time, the air intake control rod 17 is no longer blocked by the stop frame 16, and the air cut-off disc 171 will drive the air intake control rod 17 to abut against the outer side of the alarm platform 15. At the same time, the air intake control rod 17 abuts against the output door 402 through the alarm push frame 22 and compresses the top door spring 403. As the alarm platform 15 rotates synchronously with the air drying motor 13, when the lug 150 approaches the air intake control rod 17, it will force the air intake control rod 17 to move to the right, causing the air intake control rod 17 to push the alarm push frame 22 away from the output door 402. The output door 402 is pushed by the elastic force of the top door spring 403 to close again and strike the right opening of the support seat 4. As the alarm platform 15 rotates continuously, the air intake control rod 17 will also move back and forth left and right. The alarm push frame 22 frequently pushes the output door 402 to squeeze the top door spring 403, causing the output door 402 to frequently strike the support seat 4, using the sound generated by the impact to warn external operators that there is a seal leakage in the drying box 6 and maintenance is required.

Claims

1. A circuit board surface coating device for circuit board production, comprising a frame (1), a servo motor (2) fixedly installed on the frame (1), and a conveyor belt (3) driven by the servo motor (2), characterized in that, It further includes: A support base (4) is fixedly installed on the frame (1). Upper and lower material openings are provided on both the left and right sides of the support base (4). A coating box (5) and a drying box (6) are installed on the top. The conveyor belt (3) runs through the inner cavities of the coating box (5) and the drying box (6). A coating assembly (500) is arranged inside the coating box (5). An axial flow fan blade (14) driven by an air drying motor (13) is arranged inside the drying box (6). A filter cylinder (7) is threadedly connected to the outside of the drying box (6). A filter assembly (20) is arranged inside the filter cylinder (7). The downward airflow generated by the axial flow fan blade (14) makes the chamber between the coating box (5) and the drying box (6) form a positive pressure, forcing the airflow to be discharged unidirectionally from the left and right openings of the support base (4), forming a continuous and pure airflow.

2. The circuit board surface coating device for circuit board production according to claim 1, characterized in that, Multiple groups of positioning assemblies (300) are arranged at equal intervals on the surface of the conveyor belt (3).

3. The circuit board surface coating device for circuit board production according to claim 1, characterized in that, An input door (401) is hinged to the left side of the support base (4), and an output door (402) is hinged to the right side. The input door (401) and the output door (402) can seal the openings of the support base (4).

4. The circuit board surface coating device for circuit board production according to claim 1, characterized in that, A cylinder (9) is fixedly installed on the top of the drying box (6). The output end of the cylinder (9) is connected to a traction ring frame (10). The traction ring frame (10) is movably connected to an air isolation outer sleeve (12) through a guide rod. The air isolation outer sleeve (12) is hermetically and slidably connected to the inner wall of the drying box (6), and a lifting spring (110) sleeved outside the guide rod is arranged between the air isolation outer sleeve (12) and the traction ring frame (10).

5. The circuit board surface coating device for circuit board production according to claim 4, characterized in that, The bottom end of the guide rod is fixedly connected to an air isolation cylinder (11). The air drying motor (13) is fixed to the middle of the air isolation cylinder (11) through a bracket. An electric heating ring (21) is arranged at the bottom of the air isolation cylinder (11).

6. The circuit board surface coating device for circuit board production according to claim 5, wherein, The air isolation cylinder (11) is a cylindrical structure with a through middle part.

7. The circuit board surface coating device for circuit board production according to claim 4, wherein A cleaning and plugging piston seat (18) is hermetically and movably sleeved inside the filter cylinder (7). An annular arc groove is provided on the outside of the cleaning and plugging piston seat (18). An air intake control rod (17) with a return spring (170) is movably installed in the middle. A gas cut-off disc (171) is fixedly connected to the side of the air intake control rod (17). A limit spring push rod (19) is movably installed on the outside of the filter cylinder (7). When the limit spring push rod (19) abuts against the annular arc groove on the outside of the cleaning and plugging piston seat (18), it can limit the movement resistance when the two are disengaged.

8. The circuit board surface coating device for circuit board production according to claim 7, characterized in that, A stop frame (16) is fixedly connected to the top of the traction ring frame (10). The stop frame (16) limits the axial movement of the air intake control rod (17).

9. The circuit board surface coating device for circuit board production according to claim 4, characterized in that, The output shaft of the air drying motor (13) extends above the traction ring frame (10) and is connected to an alarm platform (15). A lug (150) is fixedly arranged on the outside of the alarm platform (15).

10. The circuit board surface coating device for circuit board production according to claim 9, characterized in that, A top door spring (403) is connected between the output door (402) and the drying box (6). An alarm push frame (22) is connected to the end of the air intake control rod (17). When the alarm push frame (22) compresses the top door spring (403) to a set stroke, the output door (402) is triggered to open.

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