A circuit board coating application device

Abstract

The utility model belongs to circuit board coating technical field, specifically is a kind of circuit board coating device, including box, the inside of box is divided into spraying bin and storage bin, the top side inner wall of spraying bin is fixedly connected with two fixed plates, first hollow tube and second hollow tube are fixedly connected between two fixed plates, it is connected with a plurality of spray heads on first hollow tube, it is connected with a plurality of gas outlet on second hollow tube, the water pump is installed in the top side of box;The utility model can dry and solidify the coating on the surface of circuit board after circuit board spraying is completed, avoid causing runny, orange peel and other defects, improve coating quality, by the continuous rotation of stirring vane, the gathering tendency of particle in coating can be effectively broken, avoid the precipitation or agglomerate caused by static, ensure that coating is always in uniform, flowable state, further guarantee coating quality.

Description

Technical Field

[0001] This utility model relates to the field of circuit board coating technology, specifically a circuit board coating device. Background Technology

[0002] During the production process, circuit boards need to be coated with a spray coating. A uniform protective coating can be formed on the surface of the circuit board through a spraying device, which can effectively isolate moisture and protect the circuit board from the damage of a humid environment.

[0003] Chinese patent CN114667000A discloses a circuit board surface coating device for circuit board production, including a housing. A coating chamber is located on one side of the housing, and a rotating rod is rotatably mounted on one side of the coating chamber. A secondary gear is mounted on the rotating rod. A motor is located on one side of the coating chamber, and a main gear is connected to the rotor shaft of the motor, with the main gear meshing with the secondary gear. A placement frame is located on one side of the rotating rod, and a fixing mechanism is installed inside the placement frame. A device rod is located on one side of the placement frame. After the circuit board is placed on the placement frame, a PLC controller starts a cylinder to push an upper baffle to limit the circuit board's movement. Then, a motor is started to rotate the circuit board. Next, a water pump is started to coat the front side of the circuit board, thus achieving the fixing and rotating operation of the circuit board.

[0004] The aforementioned coating device for circuit board production lacks a drying mechanism. After the circuit board is coated, the coating dries slowly by natural drying. During the natural drying process, the coating may be affected by factors such as ambient humidity and temperature, resulting in uneven drying, defects such as sagging, orange peel, and bubbles, which affect the coating quality. Therefore, a circuit board coating device is proposed to address the above problems. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art and solve the problems mentioned in the background art, this utility model proposes a circuit board coating device.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A circuit board coating device of this utility model includes a housing, which is divided into a spraying chamber and a storage chamber. Two fixing plates are fixedly connected to the inner wall of the top side of the spraying chamber. A first hollow tube and a second hollow tube are fixedly connected between the two fixing plates. Multiple nozzles are connected to the first hollow tube, and multiple air outlets are connected to the second hollow tube. A water pump is installed on one side of the top of the housing. The input port of the water pump is connected to a water suction pipe, and the output port of the water pump is connected to a conveying pipe. The other end of the conveying pipe is connected to the first hollow tube. A housing is installed on the other side of the top of the housing. A spiral heating tube is installed inside the housing. An air supply pipe is connected between the housing and the second hollow tube. An air inlet is provided inside the housing. The circuit board is equipped with a dustproof mesh plate, on which a fan is mounted. A driven gear is mounted on a rotating shaft. A second motor is installed on one side wall of the housing, and a driving gear is installed at the output end of the second motor. The driving gear and the driven gear mesh with each other. During spraying, the water pump is started, and the paint in the storage bin is sprayed onto the surface of the circuit board through the nozzle, thus completing the spraying operation on one side of the circuit board. When it is necessary to spray the other side, the circuit board needs to be flipped over, the second motor is started, and the driving gear rotates, forcing the driven gear to mesh and rotate. This causes the rotating shaft to drive the placement frame and the circuit board to rotate, thus flipping the circuit board over. By repeating the above spraying operation, the spraying operation on both sides of the circuit board can be completed quickly, greatly improving the spraying efficiency. After the circuit board is coated, a fan, in conjunction with a spiral heating element, sprays high-temperature gas onto the coated surface of the circuit board through the nozzle, quickly drying one side of the coating. When the other side needs to be dried, a second motor rotates the drive gear, forcing the driven gear to mesh and rotate. This causes the rotating shaft to rotate the placement frame and the circuit board, allowing the circuit board to be flipped over for drying. By incorporating this drying mechanism, the coating on the circuit board surface can be quickly dried and cured, preventing defects such as drips and orange peel, thus improving coating quality.

[0007] Preferably, a circular limiting groove is provided on the side wall of the spraying chamber away from the driven gear, and two limiting rods are fixedly connected to the side wall of the placement frame, and the limiting rods are slidably assembled in the circular limiting groove. During the rotation of the placement frame, the cooperation between the circular limiting groove and the limiting rods enables the placement frame to rotate more stably. Preferably, a first motor is installed on the top side of the storage silo, and a rotating rod is connected to the output end of the first motor. Multiple stirring blades are connected to the rotating rod, and a liquid injection pipe is connected to the top side of the storage silo. During spraying, in order to prevent the paint from solidifying or clumping, the stirring blades are rotated by the operation of the first motor. The continuous rotation of the stirring blades can effectively break the tendency of particles in the paint to aggregate, avoid sedimentation or clumping caused by standing, and ensure that the paint is always in a uniform and flowable state, further ensuring the coating quality.

[0008] Preferably, rotating shafts are rotatably mounted on both inner walls of the spraying chamber, and a placement frame is fixedly connected between the two rotating shafts. Four lower baffles are fixedly connected to the bottom side of the placement frame. Two mounting slots are opened on both side walls of the placement frame, and an upper baffle is slidably fitted in each mounting slot. Two electric push rods are installed on both side walls of the placement frame, and the actuating end of the electric push rod is fixed to one side wall of the upper baffle. A battery is installed on the top side of the placement frame, and the battery powers the electric push rods. When clamping and fixing the circuit board, the circuit board to be sprayed is placed in the placement frame, so that the bottom end of the circuit board abuts against the lower baffle. Then, through the control panel, the four electric push rods are controlled to work synchronously, so that the upper baffle moves out from the mounting slot, thereby limiting and fixing the top end. By limiting the bottom and top ends of the circuit board through the lower baffle and the upper baffle, the circuit board can be effectively limited and fixed, preventing the circuit board from slipping during subsequent flipping.

[0009] Preferably, a collection box is provided on the bottom side of the spraying chamber. An opening is provided on one side wall of the collection box, and a positioning slot is provided on the other side wall of the collection box. A filter screen is slidably assembled with the opening and the positioning slot. A push-pull plate is fixed to one end of the filter screen, and a first handle is installed on the push-pull plate. When using the device, the filter screen can be easily replaced by the cooperation of the opening and the positioning slot, ensuring the subsequent filtration effect.

[0010] Preferably, a circulation pump is installed at the bottom of one side of the housing. The input port of the circulation pump is connected to a liquid extraction pipe, and the other end of the liquid extraction pipe is connected to a collection box. The liquid extraction pipe is located below the filter screen. The output port of the circulation pump is connected to a return pipe, and the other end of the return pipe is connected to a storage bin. During the spraying process, excess paint will fall into the collection box. Through the action of the filter screen, impurities in the paint can be intercepted, allowing the paint without impurities to flow into the bottom of the collection box through the filter holes. Through the action of the circulation pump, the paint at the bottom of the collection box is discharged through the liquid extraction pipe and flows back into the storage bin through the return pipe, thereby realizing the recycling of paint and avoiding paint waste.

[0011] Preferably, a material inlet is provided on one side wall of the housing, and a sealing door is hinged to the side wall of the material inlet via a hinge. The sealing door is equipped with a second handle and an observation window. When using the device, the observation window allows the operator to directly observe the spraying and drying status of the circuit board inside the housing without opening the sealing door. This visual monitoring helps to detect process abnormalities in a timely manner and avoid quality problems caused by operational errors or equipment failures.

[0012] Preferably, a control panel is installed on one side of the housing, and the control panel is used to control the start and stop of the first motor, the second motor, the water pump, the circulating pump, the electric actuator and the fan. When using the device, by setting up the control panel, multiple drive devices can be integrated into a single interface, and the operator does not need to switch between multiple independent devices, thus improving work efficiency.

[0013] The advantages of this utility model are: 1. After the circuit board is coated, the present invention uses a fan to spray high-temperature gas onto the coating surface of the circuit board through the outlet nozzle, in conjunction with the spiral heating tube. This allows for rapid drying of the coating on one side of the circuit board. When it is necessary to flip the circuit board to dry the coating on the other side, the second motor rotates the drive gear, which in turn forces the driven gear to mesh and rotate. This causes the rotating shaft to rotate the placement frame and the circuit board, allowing the circuit board to be flipped over for drying on the other side. By setting up a drying mechanism, the coating on the surface of the circuit board can be dried and cured quickly, avoiding defects such as drips and orange peel, and improving the coating quality. 2. In order to prevent the paint from solidifying or clumping during spraying, the first motor operates to make the stirring blades rotate. The continuous rotation of the stirring blades can effectively break the tendency of particles in the paint to aggregate, avoid sedimentation or clumping caused by standing, and ensure that the paint is always in a uniform and flowable state, thus further guaranteeing the coating quality. 3. In the spraying process of this utility model, excess paint will flow into the collection box. Through the action of the filter screen, impurities in the paint can be intercepted, allowing the paint without impurities to flow into the bottom of the collection box through the filter holes. Through the action of the circulation pump, the paint at the bottom of the collection box is discharged through the liquid extraction pipe and flows back into the storage bin through the return pipe, thereby realizing the recycling of paint and avoiding paint waste. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall front-view three-dimensional structure of the device; Figure 2 This is a three-dimensional structural diagram of the internal components of the spray booth; Figure 3 This is a sectional three-dimensional structural diagram of the box. Figure 4 A three-dimensional structural diagram of the entire device is provided; Figure 5 A three-dimensional structural diagram of the nozzle and air outlet assembly; Figure 6 This is a schematic diagram of the three-dimensional structure of the limiting mechanism; Figure 7 This is a schematic diagram of the three-dimensional structure of the reflow assembly; In the diagram: 1. Box body; 2. Spraying chamber; 3. Storage silo; 4. Fixing plate; 5. First hollow tube; 6. Second hollow tube; 7. Spray nozzle; 8. Air outlet; 9. Water pump; 10. Water suction pipe; 11. Conveying pipe; 12. Machine casing; 13. Spiral heating tube; 14. Air supply pipe; 15. Dustproof mesh plate; 16. Fan; 17. First electric motor; 18. Rotating rod; 19. Stirring blades; 20. Rotating shaft; 21. Placement frame; 22. Lower part 23. Upper baffle; 24. Electric push rod; 25. Battery; 26. Driven gear; 27. Second motor; 28. Drive gear; 29. ​​Collection box; 30. Filter screen; 31. Push-pull plate; 32. Circulation pump; 33. Liquid extraction pipe; 34. Return pipe; 35. Material inlet; 36. Sealing door; 37. Observation window; 38. Second handle; 39. Control panel; 40. Liquid injection pipe; 41. Circular limit groove; 42. Limit rod. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0017] Please see Figure 1-6As shown, a circuit board coating device includes a housing 1, which is divided into a spraying chamber 2 and a storage chamber 3. Two fixing plates 4 are fixed to the inner top wall of the spraying chamber 2. A first hollow tube 5 and a second hollow tube 6 are fixed between the two fixing plates 4. Multiple nozzles 7 are connected to the first hollow tube 5, and multiple air outlets 8 are connected to the second hollow tube 6. A water pump 9 is installed on one side of the top of the housing 1. A water pump 10 is connected to the input port of the water pump 9, and a delivery pipe 11 is connected to the output port of the water pump 9. The other end of the delivery pipe 11 is connected to the first hollow tube 5. A housing 12 is installed on the other side of the top of 1. A spiral heating tube 13 is installed inside the housing 12. An air supply pipe 14 is connected between the housing 12 and the second hollow tube 6. A dustproof mesh plate 15 is installed in the air inlet of the housing 12. A fan 16 is installed on the dustproof mesh plate 15. During operation, after the circuit board is fixed in the limit position, when spraying, the water pump 9 is started, so that the paint in the storage bin 3 is drawn out through the water pump pipe 10 and transported into the first hollow tube 5 through the conveying pipe 11. Finally, it is sprayed onto the surface of the circuit board through the nozzle 7, thereby completing the spraying operation on one side of the circuit board. A driven gear 26 is mounted on a rotating shaft 20. A second motor 27 is installed on one side wall of the housing 1. A driving gear 28 is installed at the output end of the second motor 27, and the driving gear 28 meshes with the driven gear 26. A circular limiting groove 41 is provided on one side wall of the spraying chamber 2 away from the driven gear 26. Two limiting rods 42 are fixedly connected to one side wall of the placement frame 21, and the limiting rods 42 are slidably assembled in the circular limiting groove 41. During operation, when it is necessary to spray the other side, the circuit board needs to be flipped over. The second motor 27 is started, causing the driving gear 28 to rotate, which forces the driven gear 26 to mesh and rotate. This causes the rotating shaft 20 to drive the placement frame 21 and the circuit board to rotate, thereby flipping the circuit board. By repeating the above spraying operation, the spraying operation on both sides of the circuit board can be completed quickly, which greatly improves the efficiency of spraying. After the circuit board is coated, the fan 16, in conjunction with the spiral heating tube 13, blows the heated high-temperature gas into the gas supply pipe 14, then into the second hollow tube 6, and finally sprays it onto the surface of the circuit board coating through the air outlet 8. This allows for the rapid drying of the coating on one side of the circuit board. When it is necessary to flip the circuit board to dry the coating on the other side, the second motor 27 flips the circuit board to dry the other side. By setting up a drying mechanism, the coating on the surface of the circuit board can be dried and cured quickly, avoiding defects such as sagging and orange peel, and improving the coating quality. A first motor 17 is installed on the top side of the storage silo 3. The output end of the first motor 17 is connected to a rotating rod 18, and multiple stirring blades 19 are connected to the rotating rod 18. A liquid injection pipe 40 is connected to the top side of the storage silo 3. During operation, in order to prevent the paint from solidifying or clumping, the first motor 17 operates to drive the rotating rod 18 to rotate the stirring blades 19. The continuous rotation of the stirring blades 19 can effectively break the tendency of particles in the paint to aggregate, avoid sedimentation or clumping caused by standing, and ensure that the paint is always in a uniform and flowable state, further ensuring the coating quality. Please see Figure 6 As shown, rotating shafts 20 are rotatably mounted on both inner walls of the spraying chamber 2. A placement frame 21 is fixedly connected between the two rotating shafts 20. Four lower baffles 22 are fixedly connected to the bottom side of the placement frame 21. Two mounting slots are opened on both sides of the placement frame 21, and an upper baffle 23 is slidably fitted in each mounting slot. Two electric push rods 24 are installed on both sides of the placement frame 21, and the actuating end of the electric push rod 24 is fixedly connected to one side wall of the upper baffle 23. A battery 25 is installed on the top side of the placement frame 21, and the battery 25 supplies power to the electric push rods 24. During operation, before spraying the circuit board, it needs to be clamped and fixed. First, place the circuit board to be sprayed in the placement frame 21 so that the bottom of the circuit board abuts against the lower baffle 22. Then, through the control panel 39, control the four electric push rods 24 to work synchronously, so that the upper baffle 23 moves out from the mounting slot, thereby limiting and fixing the top end. By limiting the bottom and top ends of the circuit board through the lower baffle 22 and the upper baffle 23, the circuit board can be effectively limited and fixed, preventing the circuit board from slipping during subsequent flipping. Please see Figure 2-4 and Figure 7 As shown, a collection box 29 is provided on the bottom side of the spraying chamber 2. An opening is provided on one side wall of the collection box 29, and a positioning slot is provided on the other side wall of the collection box 29. A filter screen plate 30 is slidably assembled with the opening and the positioning slot. A push-pull plate 31 is fixedly connected to one end of the filter screen plate 30, and a first handle is assembled on the push-pull plate 31. When using the device, the filter screen plate 30 can be easily replaced by the cooperation of the opening and the positioning slot, ensuring the subsequent filtration effect. A circulation pump 32 is installed at the bottom of one side of the housing 1. The input port of the circulation pump 32 is connected to a liquid extraction pipe 33, and the other end of the liquid extraction pipe 33 is connected to a collection box 29. The liquid extraction pipe 33 is located below the filter screen plate 30. The output port of the circulation pump 32 is connected to a return pipe 34, and the other end of the return pipe 34 is connected to a storage bin 3. During operation, excess paint generated during the spraying process will flow into the collection box 29. Through the action of the filter screen plate 30, impurities in the paint can be intercepted, allowing the paint without impurities to flow into the bottom of the collection box 29 through the filter holes. Through the action of the circulation pump 32, the paint at the bottom of the collection box 29 is extracted through the liquid extraction pipe 33 and flows back into the storage bin 3 through the return pipe 34, thereby realizing the recycling of paint and avoiding waste of paint. Please see Figure 1 As shown, a material inlet 35 is provided on one side wall of the housing 1. A sealing door 36 is hinged to the side wall of the material inlet 35 via a hinge. A second handle 38 is installed on the sealing door 36, and an observation window 37 is provided on the sealing door 36. During operation, when using this device, the observation window 37 allows the operator to directly observe the spraying and drying status of the circuit board inside the housing 1 without opening the sealing door 36. This visual monitoring helps to detect process abnormalities in a timely manner and avoid quality problems caused by operational errors or equipment failures. A control panel 39 is installed on one side of the housing 1. The control panel 39 is used to control the start and stop of the first motor 17, the second motor 27, the water pump 9, the circulating pump 32, the electric push rod 24 and the fan 16. When the device is in operation, by setting up the control panel 39, multiple drive devices can be integrated into a single interface, and the operator does not need to switch between multiple independent devices, thus improving work efficiency. Working Principle: Existing circuit board coating equipment lacks a drying mechanism, resulting in slow natural drying of the coating after spraying. Furthermore, during natural drying, the coating may experience uneven drying due to environmental humidity, temperature, and other factors, leading to defects such as sagging, orange peel, and bubbles, thus affecting coating quality. Therefore, a circuit board coating device is proposed to address these issues. Before spraying the circuit board, it needs to be clamped and fixed. First, the circuit board to be sprayed is placed in the placement frame 21, with the bottom end of the circuit board abutting against the lower baffle 22. Then, through the control panel 39, four electric push rods 24 are controlled to work synchronously, causing the upper baffle 23 to move out of the mounting slot, thereby limiting and fixing the top end. By limiting the bottom and top ends of the circuit board through the lower baffle 22 and the upper baffle 23, the circuit board can be effectively limited and fixed, preventing it from slipping during subsequent flipping. After the circuit board is fixed in place, during spraying, the water pump 9 is started, and the paint in the storage bin 3 is drawn out through the water pipe 10 and transported into the first hollow tube 5 through the conveying pipe 11. Finally, it is sprayed onto the surface of the circuit board through the nozzle 7, thus completing the spraying operation on one side of the circuit board. When the other side needs to be sprayed, the circuit board needs to be flipped over. The second motor 27 is started, causing the drive gear 28 to rotate, which forces the driven gear 26 to mesh and rotate. This causes the rotating shaft 20 to drive the placement frame 21 and the circuit board to rotate, thus flipping the circuit board over. By repeating the above spraying operation, the spraying operation on both sides of the circuit board can be completed quickly, greatly improving the efficiency of spraying. After the circuit board is coated, the fan 16, in conjunction with the spiral heating tube 13, blows the heated high-temperature gas into the gas supply pipe 14, then into the second hollow tube 6, and finally sprays it onto the surface of the circuit board coating through the air outlet 8. This allows for the rapid drying of the coating on one side of the circuit board. When it is necessary to flip the circuit board to dry the coating on the other side, the second motor 27 flips the circuit board to dry the other side. By setting up a drying mechanism, the coating on the surface of the circuit board can be dried and cured quickly, avoiding defects such as sagging and orange peel, and improving the coating quality. During the spraying process, excess paint will flow into the collection box 29. The filter screen 30 can intercept impurities in the paint, allowing the impurity-free paint to flow into the bottom of the collection box 29 through the filter holes. The circulation pump 32 will draw the paint from the bottom of the collection box 29 out through the extraction pipe 33 and return it to the storage bin 3 through the return pipe 34, thereby realizing the recycling of paint and avoiding paint waste. During spraying, in order to prevent the paint from solidifying or clumping, the first motor 17 operates to drive the rotating rod 18 to rotate the stirring blade 19. The continuous rotation of the stirring blade 19 can effectively break the tendency of particles in the paint to aggregate, avoid sedimentation or clumping caused by standing, and ensure that the paint is always in a uniform and flowable state, further guaranteeing the coating quality.

[0018] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0019] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A circuit board coating apparatus, characterized in that: The container includes a housing (1), which is divided into a spraying chamber (2) and a storage chamber (3). Two fixing plates (4) are fixed to the inner wall of the top side of the spraying chamber (2). A first hollow tube (5) and a second hollow tube (6) are fixed between the two fixing plates (4). Multiple nozzles (7) are connected to the first hollow tube (5), and multiple air outlets (8) are connected to the second hollow tube (6). A water pump (9) is installed on one side of the top of the housing (1). A water pump (9) is connected to a water suction pipe (10) through its input port, and a conveying pipe (11) is connected to the output port of the water pump (9). The other end of the conveying pipe (11) is connected to the first hollow tube. (5) Connected, the top of the box (1) is equipped with a shell (12), a spiral heating tube (13) is provided inside the shell (12), a gas supply pipe (14) is connected between the shell (12) and the second hollow tube (6), a dustproof mesh plate (15) is provided in the air inlet of the shell (12), a fan (16) is installed on the dustproof mesh plate (15), a first motor (17) is installed on the top side of the storage bin (3), a rotating rod (18) is connected to the output end of the first motor (17), a plurality of stirring blades (19) are connected on the rotating rod (18), and a liquid injection pipe (40) is connected to the top side of the storage bin (3).

2. The circuit board coating apparatus according to claim 1, characterized in that: Rotating shafts (20) are rotatably installed on both inner walls of the spraying chamber (2). A placement frame (21) is fixed between the two rotating shafts (20). Four lower baffles (22) are fixed to the bottom side of the placement frame (21). Two mounting slots are opened on both sides of the placement frame (21). An upper baffle (23) is slidably installed in each mounting slot. Two electric push rods (24) are installed on both sides of the placement frame (21). The working end of the electric push rod (24) is fixed to one side wall of the upper baffle (23). A battery (25) is installed on the top side of the placement frame (21). The battery (25) supplies power to the electric push rod (24).

3. The circuit board coating apparatus according to claim 2, characterized in that: A driven gear (26) is mounted on a rotating shaft (20). A second motor (27) is installed on one side wall of the housing (1). A driving gear (28) is installed at the output end of the second motor (27). The driving gear (28) meshes with the driven gear (26). A circular limiting groove (41) is provided on one side wall of the spraying chamber (2) away from the driven gear (26). Two limiting rods (42) are fixed on one side wall of the placement frame (21). The limiting rods (42) are slidably assembled in the circular limiting groove (41).

4. The circuit board coating apparatus according to claim 2, characterized in that: A collection box (29) is provided on the bottom side of the spraying chamber (2). An opening is provided on one side wall of the collection box (29), and a positioning slot is provided on the other side wall of the collection box (29). A filter screen plate (30) is slidably assembled with the opening and the positioning slot. A push-pull plate (31) is fixedly connected to one end of the filter screen plate (30), and a first handle is assembled on the push-pull plate (31).

5. The circuit board coating apparatus according to claim 1, characterized in that: A circulation pump (32) is installed at the bottom of one side of the box (1). The input port of the circulation pump (32) is connected to a liquid extraction pipe (33), and the other end of the liquid extraction pipe (33) is connected to a collection box (29). The liquid extraction pipe (33) is located below the filter screen plate (30). The output port of the circulation pump (32) is connected to a return pipe (34), and the other end of the return pipe (34) is connected to a storage bin (3).

6. The circuit board coating apparatus according to claim 1, characterized in that: A material inlet (35) is provided on one side wall of the box (1). A sealing door (36) is hinged to one side wall of the material inlet (35) by a hinge. A second handle (38) is installed on the sealing door (36). An observation window (37) is provided on the sealing door (36).

7. The circuit board coating apparatus according to claim 1, characterized in that: A control panel (39) is installed on one side of the housing (1), and the control panel (39) is used to control the start and stop of the first motor (17), the second motor (27), the water pump (9), the circulating pump (32), the electric push rod (24) and the fan (16).

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