A spraying device for circuit board

Abstract

The present invention relates to the technical field of spraying devices, and specifically to a spraying device for circuit boards, which includes a frame, a mounting frame, a spraying mechanism, a feeding assembly, an air intake system and a control system; the spraying mechanism includes a main body, a nozzle and a splash shield; during the spraying process, the atomized paint is blocked by the splash shield when escaping to the surroundings, and adheres to the inner wall of the splash shield, which solves the problem that the paint in the spraying device of the prior art drifts from the nozzle and adheres to other areas during the spraying process, resulting in increased cleaning work, and improves the spraying efficiency. By providing a protective film, a winding assembly and a discharge assembly, the protective film is automatically replaced, and the spraying efficiency is further improved. By folding the protective film so that there are wrinkles, when the protective film is replaced, the paint on the surface of the protective film is clamped by the wrinkles and then rolled up, so as to prevent paint residue from falling from the protective film, and by setting the winding direction of the protective film, it is further prevented that the paint residue falls from the protective film.

Description

Technical Field

[0001] The invention relates to the technical field of spraying devices, and in particular to a spraying device for a circuit board. Background Art

[0002] Spraying devices are widely used in many fields and are important equipment in the electronics manufacturing industry. They are mainly used to evenly spray various coatings, such as conformal coatings and solder resists, on the surface of circuit boards to protect them and improve their performance. The current circuit board spraying device uses a spray valve to spray the conformal coating that protects the circuit board onto the surface of the circuit board. In the process of spraying the circuit board, there is a problem of uneven spraying, which leads to low circuit board yield and low processing efficiency.

[0003] To this end, the Chinese patent document with the authorization announcement number CN114345591B discloses a circuit board spraying device. The patent is provided with an adjustment mechanism and a convex groove, which can effectively adjust the length of the square hole inside the convex groove, so that people can adjust the width of the spray paint according to the width of the circuit board, thereby ensuring that the paint on the surface of the circuit board is attached in a uniform paint mist and the same weight, thereby avoiding the problem of unevenness when the circuit board is sprayed. However, during the spraying process, the mist paint sprayed from the nozzle will drift from the nozzle to the surroundings and adhere to other areas, increasing the cleaning work and affecting the spraying efficiency. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention proposes a spraying device for circuit boards, which can prevent the atomized paint from drifting to other areas during the spraying process, increasing the cleaning work, and the problem of low spraying efficiency caused by shutdown for cleaning.

[0005] A spraying device for a circuit board of the present invention adopts the following technical scheme, including a frame, a mounting frame, a spraying mechanism, a feeding assembly, an air intake system and a control system;

[0006] The frame is horizontally provided with a workbench, which extends in the front-rear direction;

[0007] The spraying mechanism is installed on the frame, the spraying mechanism is located above the workbench, and the spraying mechanism includes a main body, a nozzle and a splash shield; the main body is connected to the mounting frame; the lower end of the main body is connected to a spray head, the spray head atomizes the paint, and the nozzle is connected to the lower end of the spray head; the splash shield is installed at the lower end of the main body and is coaxially sleeved outside the nozzle;

[0008] The feeding assembly, the air intake system and the control system are connected with the main body. The feeding assembly is used to introduce paint into the main body, the air intake system is used to introduce gas into the main body, and the control system is used to adjust the spraying parameters.

[0009] Optionally, a protective film is provided on the inner wall of the splash shield.

[0010] Optionally, a winding assembly, a feeding assembly and a connecting frame are provided in the splash shield; the connecting frame is provided inside the splash shield and fixedly connected to the splash shield; the winding assembly and the feeding assembly are spaced apart in the vertical direction, and the two are fixedly connected to the splash shield through the connecting frame; the protective film is tensionedly laid on the inner wall of the splash shield; the two ends of the protective film are respectively connected to the winding assembly and the feeding assembly, the winding assembly is used to wind up the contaminated protective film, and the feeding assembly is used to release the protective film when the winding assembly is winding up.

[0011] Optionally, the connecting frame includes a first support rod and a second support rod; the first support rod and the second support rod extend radially along the splash shield, one end of the first support rod close to the splash shield is fixedly connected to the splash shield, and the first support rod is located above the second support rod;

[0012] The winding assembly includes a first winding ring and a plurality of first rotating balls. The first winding ring is annular and fixedly connected to an end of the first support rod away from the splash shield. The first winding ring is hollow inside, and a wire is arranged inside the first winding ring, and the wire is connected to a power source. The plurality of first rotating balls are evenly distributed along the circumference of the first winding ring and are rotatably sleeved on the first winding ring. The first rotating balls are made of magnetic material.

[0013] The discharge assembly includes a second winding ring and a plurality of second rotating balls. The second winding ring is fixedly connected to one end of the second support rod away from the splash guard. The plurality of second rotating balls are evenly distributed along the circumference of the second winding ring and are rotatably mounted on the second winding ring. The protective film extends in the up and down directions, one end of the long side of the protective film is wound around the outside of the plurality of first rotating balls, and the other end is wound around the outside of the plurality of second rotating balls.

[0014] Optionally, the splash shield is in a downwardly tapered shape, and the protective film has wrinkles; two ends of the short side of the protective film are respectively located on both sides of the first support rod and the second support rod.

[0015] Optionally, the position close to the nozzle is set as the inner side along the radial direction of the splash shield, and the direction away from the nozzle is set as the outer side; the connection position between the unwound part of the protective film and the rolled-up protective film on the first winding circle is located on the outer side of the first winding circle, and the connection position between the unwound part of the protective film and the rolled-up protective film on the second winding circle is located on the inner side of the second winding circle.

[0016] Optionally, the connecting frame further includes a matching plate and a connecting rod, wherein the matching plate is fixedly connected to the first support rod and extends upward, the matching plate is clamped to the nozzle, and the first support rod is connected to the second support rod via the connecting rod.

[0017] Optionally, a striker is movably provided in the middle of the main body; the air intake system includes a normal air inlet, a control air inlet and a spray air inlet, and the three are connected to an air compression device through an air pipe; the normal air inlet and the control air inlet are distributed at intervals up and down and fixedly connected to the main body, and the spray air inlet is fixedly connected to the spray head; the feeding assembly includes a feed port, the feed port is connected to a feed pipe, the feed pipe is connected to a storage box, and the storage box is filled with paint.

[0018] Optionally, an adjusting knob is rotatably mounted on the upper end of the main body, and the adjusting knob can be used to adjust the spray width.

[0019] Optionally, a plurality of spraying mechanisms are mounted on the mounting frame.

[0020] The beneficial effect of the present invention is that a spraying device for circuit boards of the present invention is provided with a splash shield outside the nozzle. During the spraying process, the atomized paint is blocked by the splash shield when escaping to the surroundings and adheres to the inner wall of the splash shield, thereby solving the problem in the prior art that when spraying the circuit board, the paint drifts from the nozzle and adheres to other areas, resulting in increased cleaning work. At the same time, since the time of the cleaning work is shortened, the spraying efficiency is improved.

[0021] Furthermore, by laying a protective film on the inner wall of the splash guard, the paint adheres to the protective film rather than the inner wall of the splash guard when it is scattered, so that when cleaning, only the splash guard needs to be replaced, further shortening the cleaning time and improving the spraying efficiency; by setting a winding component and a discharging component, a new protective film can be automatically replaced on the inner wall of the splash guard, further shortening the downtime for cleaning and improving the spraying efficiency.

[0022] Furthermore, by setting the splash shield to a cone with a small top and a large bottom, and by folding the protective film with wrinkles, when laying the protective film, the paint attached to the surface of the protective film is clamped by the wrinkles and then rolled onto the first winding circle, thereby preventing paint residue from falling from the protective film and affecting the spraying effect. And by setting the winding direction of the protective film, it is further prevented that the paint residue falls from the protective film. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of the overall structure of a spray coating device for a circuit board according to the present invention;

[0025] Figure 2It is a structural schematic diagram of a spraying mechanism in a spraying device for a circuit board of the present invention;

[0026] Figure 3 It is a structural schematic diagram of a splash shield in a spray coating device for a circuit board according to the present invention;

[0027] Figure 4 It is a front view of a splash shield in a spray coating device for a circuit board according to the present invention;

[0028] Figure 5 for Figure 4 Middle AA section cutaway view;

[0029] Figure 6 for Figure 4 Middle BB section cutaway view;

[0030] Figure 7 The present invention is a schematic structural diagram of a winding assembly and a discharging assembly in a spraying device for a circuit board.

[0031] In the figure:

[0032] 100, rack; 110, workbench; 120, track;

[0033] 200, mounting frame;

[0034] 300, spraying mechanism; 310, main body; 311, striker; 312, nozzle; 313, spray head; 314, adjusting knob; 315, feed port; 316, normal air inlet; 317, control air port; 318, spray air inlet; 320, splash shield; 330, protective film; 340, connecting frame; 341, first support rod; 342, second support rod; 343, matching plate; 344, connecting rod; 350, winding assembly; 351, first winding circle; 352, first rotating ball; 353, power cord; 360, unwinding assembly; 361, second winding circle; 362, second rotating ball. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] like Figures 1 to 7 As shown, a spraying device for a circuit board provided in an embodiment of the present invention includes a frame 100, a mounting frame 200, a spraying mechanism 300, a feeding assembly, an air intake system and a control system.

[0037] The frame 100 is horizontally provided with a workbench 110 , and the workbench 110 can extend in the front-rear direction; the frame 100 is provided with a track 120 , and the workbench 110 can be slidably installed on the frame 100 along the track 120 .

[0038] The mounting frame 200 is mounted on the frame 100 and is located above the workbench 110 ; a plurality of spraying mechanisms 300 are mounted on the mounting frame 200 .

[0039] The spraying mechanism 300 includes a main body 310 and a splash shield 320; the main body 310 is connected to the mounting frame 200; the lower end of the main body 310 is connected to a spray head 313, and the spray head 313 is detachably connected to the bottom of the main body 310, such as a threaded connection, the spray head 313 atomizes the paint, and the lower end of the spray head 313 is connected to a nozzle 312; the splash shield 320 is installed at the lower end of the main body 310 and is coaxially mounted outside the nozzle 312.

[0040] An adjusting knob 314 is rotatably mounted on the upper end of the main body 310, and the adjusting knob 314 can be used to adjust the spray width; a striker 311 is movably arranged in the middle of the main body 310; the main body 310 is connected to a feeding assembly, an air intake system and a control system; the feeding assembly is used to introduce paint into the main body 310, and the feeding assembly includes a feeding port 315, and the feeding port 315 is connected to a feeding pipe, and the feeding pipe is connected to a storage box, and the storage box is filled with paint.

[0041] The air intake system is used to introduce gas into the main body 310. The air intake system includes a normal air inlet 316, a control air inlet 317 and a spray air inlet 318. The three are connected to an air compression device, such as an air compressor or an air pump, through an air pipe; the normal air inlet 316 and the control air inlet 317 are fixedly connected to the main body 310 at intervals up and down, and the spray air inlet 318 is fixedly connected to the spray head 313; the paint enters the main body 310 through the feed pipe and the feed port 315; the normal air inlet 316 provides a stable air source for the entire device; when spraying, the air flow of the control air inlet 317 can be adjusted by the control system, thereby controlling the opening and closing of the striker 311. When the striker 311 is opened, the gas enters the spray head 313, so that the paint in the main body 310 is pushed to the spray head 313; the gas introduced into the spray air inlet 318 is mixed and atomized with the paint in the spray head, and finally sprayed to the circuit board through the nozzle 312.

[0042] When spraying the circuit board, the circuit board is placed on the workbench 110, and parameters such as the spraying speed and spraying thickness are adjusted through the control system; the feeding component injects paint into the main body 310, and the air intake system introduces air into the main body 310, and the paint is sprayed from the nozzle 312 to the circuit board. During the spraying process, the atomized paint is blocked by the splash guard 320 when escaping to the surroundings, and adheres to the inner wall of the splash guard 320, thereby solving the problem in the prior art that when spraying the circuit board, the paint drifts from the nozzle 312 and adheres to other areas, resulting in increased cleaning work. At the same time, the spraying efficiency is improved because the duration of the cleaning work is shortened.

[0043] In a further embodiment, Figure 2 As shown, a protective film 330 is provided on the inner wall of the splash shield 320. When spraying, the atomized paint is blocked by the protective film 330 when escaping to the surroundings, thereby avoiding adhesion to the inner wall of the splash shield 320. As the spraying work proceeds, the paint escaping to the surroundings is attached to the protective film 330. When there is a lot of attached paint, only the protective film 330 in the splash shield 320 needs to be replaced instead of replacing the entire splash shield 320. The splash shield 320 can be repeatedly recycled to avoid affecting the spraying work and reduce production costs.

[0044] In a further embodiment, Figure 3 , Figure 5 , Figure 7 As shown, a winding assembly 350, a feeding assembly 360 and a connecting frame 340 are arranged in the splash shield 320; the connecting frame 340 is arranged inside the splash shield 320 and is fixedly connected to the splash shield 320; the winding assembly 350 and the feeding assembly 360 are arranged at intervals in the vertical direction, and the two are fixedly connected to the splash shield 320 through the connecting frame 340; the protective film 330 is tensionedly laid on the inner wall of the splash shield 320; the two ends of the protective film 330 are respectively connected to the winding assembly 350 and the feeding assembly 360, the winding assembly 350 is used to wind up the contaminated protective film 330, and the feeding assembly 360 is used to release the protective film 330 when the winding assembly 350 is winding up.

[0045] During the spraying process, as the spraying work progresses, the material attached to the protective film 330 increases. After the preset spraying time, the winding component 350 winds up the used protective film 330. At the same time, the unwinding component 360 releases the protective film 330 on it, and a new protective film 330 is laid on the inner wall of the splash guard 320, reducing the frequency of replacing the protective film 330, thereby shortening the cleaning time and further improving the spraying efficiency.

[0046] In a further embodiment, Figure 5 , Figure 7As shown, the connecting frame 340 includes a first support rod 341 and a second support rod 342; the first support rod 341 and the second support rod 342 extend radially along the splash shield 320, and one end close to the splash shield 320 is fixedly connected to the splash shield 320, and the first support rod 341 is located above the second support rod 342.

[0047] The winding assembly 350 includes a first winding ring 351 and a plurality of first rotating balls 352. The first winding ring 351 is ring-shaped and fixedly connected to the end of the first support rod 341 away from the splash cover 320. The first winding ring 351 is hollow inside, and a wire is arranged inside the first winding ring 351, and the wire is connected to a power supply. The plurality of first rotating balls 352 are evenly distributed along the circumference of the first winding ring 351 and are rotatably mounted on the first winding ring 351. The first rotating balls 352 are made of magnetic material.

[0048] The discharge assembly 360 includes a second winding ring 361 and a plurality of second rotating balls 362. The second winding ring 361 is fixedly connected to one end of the second support rod 342 away from the splash cover 320. The plurality of second rotating balls 362 are evenly distributed along the circumference of the second winding ring 361 and are rotatably mounted on the second winding ring 361. The protective film 330 extends in the up and down directions. One end of the long side of the protective film 330 is wound around the outside of the plurality of first rotating balls 352, and the other end is wound around the outside of the plurality of second rotating balls 362.

[0049] When the protective film 330 needs to be replaced, during the spraying process, as the spraying work proceeds, the material attached to the protective film 330 increases. After the spraying work for a preset time, a directional current is passed through the wire in the first winding circle 351. The wire is energized to generate a magnetic field, and the magnetic first rotating ball 352 rotates under the action of the magnetic field, thereby driving the protective film 330 wound thereon to be rolled up on the first winding circle 351; at the same time, the second rotating ball 362 rotates to release the protective film 330 wound thereon, and a new protective film 330 is laid on the inner wall of the splash guard 320, and the protective film 330 is automatically replaced, thereby shortening the downtime for cleaning and further improving the spraying efficiency.

[0050] In a further embodiment, Figure 3 , Figure 5As shown, the splash guard 320 is in the shape of a cone with a large mouth pointing downward, and the protective film 330 has wrinkles; the two ends of the short side of the protective film 330 are respectively located on both sides of the first support rod 341 and the second support rod 342, thereby preventing the protective film 330 from being intercepted by the first support rod 341 or the second support rod 342 during the winding process; due to the wrinkles of the protective film 330, at the position where the protective film 330 contacts the first support rod 341 or the second support rod 342, the two ends of the short side of the protective film 330 are respectively located on both sides of the first support rod 341 or the second support rod 342, and at the position between the first support rod 341 and the second support rod 342, the two ends of the short side of the protective film 330 are naturally close to each other and form a circle, thereby preventing the paint from penetrating the gap between the two ends of the short side of the protective film 330 and causing the paint to adhere to the splash guard 320.

[0051] The splash shield 320 is smaller at the top and larger at the bottom, the folds at the lower end of the protective film 330 are less folded, while the folds at the upper end are more folded. In conjunction with the rotation of the first rotating ball 352, during the winding process, the protective film 330 moves from bottom to top, and the folds continue to fold on the original basis, and the distance between two adjacent folds gradually decreases. The paint attached to the surface of the protective film 330 is clamped by the folds and then rolled onto the first winding ring 351, preventing paint residue from falling from the protective film 330 and affecting the spraying effect.

[0052] In a further embodiment, Figure 5 As shown, along the radial direction of the splash shield 320, the position close to the nozzle 312 is set as the inner side, and the direction away from the nozzle 312 is set as the outer side; the connection position of the unwound part of the protective film 330 and the rolled protective film 330 on the first winding circle 351 is located on the outer side of the first winding circle 351, and the connection position of the unwound part of the protective film 330 and the rolled protective film 330 on the second winding circle 361 is located on the inner side of the second winding circle 361. In this way, it is ensured that during the process of replacing the protective film 330, the outer surfaces of the protective film 330 rolled on the first winding circle 351 and the second winding circle 361 are both clean surfaces that are not in contact with the spray, thereby further preventing the paint residue from falling from the protective film 330 and affecting the spraying effect.

[0053] In a further embodiment, Figure 3 , Figure 5 , Figure 7As shown, the connecting frame 340 also includes a matching plate 343 and a connecting rod 344. The matching plate 343 is fixedly connected to the first support rod 341 and extends upward. The matching plate 343 is clamped on the nozzle 312, and the first support rod 341 and the second support rod 342 are connected through the connecting rod 344. The wire in the first winding ring is connected to the power line 353, and the power line 353 passes through the matching plate 343 and is connected to the power supply; when the protective film 330 on the second winding ring 361 is released, the matching plate 343 can be removed from the nozzle 312 and replaced with a new splash shield 320 with a protective film 330. The used splash shields 320 are uniformly recycled, and the used protective films 330 inside are removed and replaced with new protective films 330 for next use.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A spraying device for a circuit board, characterized in that: It includes a frame, a mounting frame, a spraying mechanism, a feeding assembly, an air intake system and a control system; The frame is horizontally provided with a workbench, which extends in the front-rear direction; The spraying mechanism is installed on the frame, the spraying mechanism is located above the workbench, and the spraying mechanism includes a main body, a nozzle and a splash shield; the main body is connected to the mounting frame; the lower end of the main body is connected to a spray head, the spray head atomizes the paint, and the nozzle is connected to the lower end of the spray head; the splash shield is installed at the lower end of the main body and is coaxially sleeved outside the nozzle; the inner wall of the splash shield is provided with a protective film; The feeding assembly, the air intake system and the control system are connected to the main body, the feeding assembly is used to introduce the coating into the main body, the air intake system is used to introduce the gas into the main body, and the control system is used to adjust the spraying parameters; A reeling assembly, a discharge assembly and a connecting frame are arranged inside the splash shield; the connecting frame is arranged inside the splash shield and fixedly connected to the splash shield; the reeling assembly and the discharge assembly are arranged at intervals in the vertical direction, and the two are fixedly connected to the splash shield through the connecting frame; the protective film is laid on the inner wall of the splash shield in a tensioned manner; the two ends of the protective film are respectively connected to the reeling assembly and the discharge assembly, the reeling assembly is used to reel in the contaminated protective film, and the discharge assembly is used to release the protective film when the reeling assembly is reeled in, and the connecting frame includes a first support rod and a second support rod; the first support rod and the second support rod extend radially along the splash shield, and one end close to the splash shield is fixedly connected to the splash shield, and the first support rod is located above the second support rod; The winding assembly includes a first winding ring and a plurality of first rotating balls. The first winding ring is annular and fixedly connected to an end of the first support rod away from the splash shield. The first winding ring is hollow inside, and a wire is arranged inside the first winding ring, and the wire is connected to a power source. The plurality of first rotating balls are evenly distributed along the circumference of the first winding ring and are rotatably sleeved on the first winding ring. The first rotating balls are made of magnetic material. The discharge assembly includes a second winding ring and a plurality of second rotating balls, the second winding ring is fixedly connected to an end of the second support rod away from the splash guard, the plurality of second rotating balls are evenly distributed along the circumference of the second winding ring, and are rotatably mounted on the second winding ring; the protective film extends in the up and down directions, one end of the long side of the protective film is wound around the outside of the plurality of first rotating balls, and the other end is wound around the outside of the plurality of second rotating balls, the splash guard is in the shape of a large downward cone, and the protective film has wrinkles; the two ends of the short side of the protective film are respectively located on both sides of the first support rod and the second support rod; the folding degree of the wrinkles at the lower end of the protective film is smaller, and the folding degree of the wrinkles at the upper end is larger. When the protective film moves from bottom to top, the wrinkles at the lower end continue to fold on the original basis, and the distance between two adjacent wrinkles gradually decreases. The paint attached to the surface of the protective film is clamped by the wrinkles and rolled up onto the first winding ring.

2. A spraying device for a circuit board according to claim 1, characterized in that: It is set that along the radial direction of the splash shield, the position close to the nozzle is the inner side, and the direction away from the nozzle is the outer side; the connection position between the unwound part of the protective film and the rolled-up protective film on the first winding circle is located on the outer side of the first winding circle, and the connection position between the unwound part of the protective film and the rolled-up protective film on the second winding circle is located on the inner side of the second winding circle.

3. A spraying device for a circuit board according to claim 1, characterized in that: The connecting frame also includes a matching plate and a connecting rod. The matching plate is fixedly connected to the first support rod and extends upward. The matching plate is clamped on the nozzle. The first support rod is connected to the second support rod through the connecting rod.

4. A spraying device for a circuit board according to any one of claims 1 to 3, characterized in that: A striker is movably arranged in the middle of the main body; the air intake system comprises a normal air inlet, a control air inlet and a spray air inlet, and the three are connected to an air compression device through an air pipe; the normal air inlet and the control air inlet are distributed at intervals up and down and fixedly connected to the main body, and the spray air inlet is fixedly connected to the spray head; the feeding assembly comprises a feed inlet, the feed inlet is connected to a feed pipe, the feed pipe is connected to a storage box, and the storage box is filled with paint.

5. A spraying device for a circuit board according to claim 4, characterized in that: An adjusting knob is rotatably mounted on the upper end of the main body, and the adjusting knob can be used to adjust the spray width.

6. A spraying device for a circuit board according to claim 4, characterized in that: A plurality of spraying mechanisms are installed on the mounting frame.

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