Coating solution bubble removing device of air knife coating machine

Abstract

The utility model relates to the technical field of coating machines, in particular to an air knife coating machine coating solution bubble removing device which comprises a tank body, and a bubble removing cavity and a storage cavity are formed in the upper side and the lower side of the interior of the tank body respectively. A stirring assembly for defoaming is rotationally mounted in the defoaming cavity; the outer wall of the transmission shaft is in coaxial key connection with a plurality of cutters for breaking bubbles; by arranging the defoaming cavity and the stirring assembly in the defoaming cavity and cooperating with the wavy stirring blades, under driving of the first motor, the rotating shaft drives the stirring rod and the stirring blades to rotate, the coating solution is fully stirred, the disturbance and shearing effects are enhanced, and stubborn bubbles and tiny bubbles in the high-viscosity solution can be more effectively broken. After preliminary defoaming, a lifting pump conveys the solution to a defoaming part, a filter screen between an inner ring body and an outer ring body is used for filtering and defoaming, and meanwhile, a second motor drives a transmission shaft and a cutter to further smash large bubbles and small bubbles intercepted on the filter screen.

Description

Technical Field

[0001] This utility model relates to the field of coating machine technology, specifically to a defoaming device for coating solution in an air knife coating machine. Background Technology

[0002] In the modern coating process, air knife coating machines are widely used due to their high efficiency and precision. The coating solution, as the working medium, directly affects the coating quality. However, during solution preparation and transportation, air bubbles can easily be introduced due to various factors. If these bubbles are not properly removed, they can cause defects on the coated surface, affecting the product's appearance and performance. Therefore, effective defoaming of the coating solution is crucial.

[0003] Utility model patent application number CN202223463498.4 discloses a defoaming device for coating solution in a coating machine. This device includes a main body, a control panel on the front surface of the main body, an observation window on the inner wall of the front surface, a drive motor at the top of the main body, a bearing below the drive motor, a rotating shaft inside the bearing, a limit hole at the bottom of the rotating shaft, a support groove on the outer side of the rotating shaft, and a longitudinal wall-breaking blade inside the support groove. This utility model, by incorporating a drive motor, rotating shaft, support groove, longitudinal wall-breaking blade, and transverse wall-breaking blade, allows the drive motor and rotating shaft to rotate the support groove during use. The longitudinal and transverse wall-breaking blades inside the support groove then work together to remove air bubbles from the coating solution, thus improving the defoaming effect and increasing work efficiency.

[0004] Although the defoaming device for the coating solution of this coating machine has the function of defoaming the coating solution, it still has shortcomings in practical use: the device relies solely on the mechanical cutting of the longitudinal and transverse wall-breaking blades to remove bubbles. For some coating solutions with high viscosity or complex bubble particle size distribution, simple mechanical cutting may not be able to completely eliminate micro bubbles and stubborn bubbles, thus limiting the defoaming effect. In view of this, we propose a defoaming device for the coating solution of an air knife coating machine. Utility Model Content

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a defoaming device for the coating solution of an air knife coating machine. Through the synergistic effect of multiple defoaming methods, it improves the defoaming effect on coating solutions with different bubble particle size distributions, ensuring that the discharged solution meets the high-quality requirements of the air knife coating machine.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A defoaming device for coating solution in an air knife coating machine, comprising:

[0008] The tank has a defoaming chamber and a storage chamber on its upper and lower sides. A stirring assembly for defoaming is rotatably installed inside the defoaming chamber. A lift pump is installed on one side of the top of the tank, and an inlet pipe is installed at the inlet of the lift pump, which extends to the bottom of the defoaming chamber.

[0009] The defoaming section is installed on the upper front side of the tank; it includes a shell with an open top, and an inlet connected to the inlet of the booster pump is installed at the top of the outer wall of the shell; the bottom of the shell has a curved pipe connected to the storage chamber, and the top of the shell has a removable cover plate, on which a second motor is installed; a drive shaft is rotatably installed in the inner cavity of the shell, and the output shaft of the second motor is coaxially keyed to the drive shaft; multiple cutters for breaking up bubbles are coaxially keyed to the outer wall of the drive shaft;

[0010] The inner cavity of the housing is provided with an inner ring body located below the cutter, and an outer ring body is provided outside the inner ring body. Multiple pull rods are fixed between the inner ring body and the outer ring body. The drive shaft passes through the inner ring body and is rotatably connected to the inner ring body. A filter screen for defoaming is provided at the top between the inner ring body and the outer ring body.

[0011] In addition, the air knife coating machine coating solution defoaming device proposed in the above application may also have the following additional technical features:

[0012] Specifically, the stirring assembly includes a rotating shaft rotatably mounted inside the tank, with multiple fixing rings coaxially keyed to the outer wall of the rotating shaft, and multiple stirring rods fixed to the outer wall of the fixing rings, with stirring blades fixed to the stirring rods; a first motor for driving the rotating shaft to rotate is installed on the top of the tank.

[0013] Specifically, the stirring blade is wavy and is tightly welded to the stirring rod.

[0014] In both of these configurations, the first motor drives the rotating shaft to rotate, which in turn drives the stirring assembly consisting of the fixed ring, stirring rod, and stirring blade to work, thereby enhancing the defoaming effect in the defoaming chamber.

[0015] Specifically, the bottom of the tank is provided with a discharge pipe connected to the tank body, and a valve is provided on the outside of the discharge pipe;

[0016] In this setup, the discharge pipe is equipped with a valve to facilitate control of the output of the defoamed solution.

[0017] Specifically, the outer wall of the shell is fixedly connected to a support plate by bolts, and the rear end of the support plate is fixedly connected to the outer wall of the tank by bolts.

[0018] In this setup, the support plate enhances the stability of the defoaming section installation.

[0019] Specifically, the inner wall of the housing is fixed with two guide rails, and the outer wall of the outer ring is provided with a guide groove that is slidably connected to the guide rails;

[0020] In this configuration, the design serves as a guide for the installation of the outer ring 26.

[0021] Specifically, the gap between the cutter and the filter screen is 0.2-0.4cm, and the cutter is made of stainless steel.

[0022] This design ensures effective bubble breaking and improves defoaming.

[0023] Specifically, level gauges are installed on the upper and lower sides of the outer wall of the tank, and the level gauges are connected to the defoaming chamber and the storage chamber, respectively.

[0024] In this setting, the level gauge allows for convenient monitoring of the liquid levels in the defoaming chamber and the storage chamber separately.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0026] By incorporating a defoaming chamber and its internal stirring components, along with wave-shaped stirring blades, the first motor drives the rotating shaft to rotate the stirring rod and blades, thoroughly stirring the coating solution and enhancing the agitation and shearing effects. Compared to simple mechanical cutting, this method more effectively breaks down stubborn and microbubbles in highly viscous solutions. After initial defoaming, a booster pump delivers the solution to the defoaming section, where a filter screen between the inner and outer rings is used for filtration and defoaming. Simultaneously, a second motor drives the drive shaft and cutter to further break down large bubbles and small bubbles trapped on the filter screen. This design, through the synergistic effect of multiple defoaming methods, improves the defoaming effect of coating solutions with different bubble size distributions, ensuring that the discharged solution meets the high-quality requirements of the air knife coating machine. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the stirring assembly in this utility model;

[0029] Figure 3 This is a cross-sectional view of the shell structure in this utility model;

[0030] Figure 4 This is a partial structural diagram of the defoaming part in this utility model;

[0031] Figure 5 This is a partial exploded structural diagram of the defoaming part in this utility model;

[0032] In the picture:

[0033] 1. Tank body; 10. Defoaming chamber; 11. Storage chamber; 12. Discharge pipe; 13. Valve; 14. First motor; 15. Rotating shaft; 16. Fixing ring; 17. Stirring rod; 18. Stirring blade; 19. Lifting pump; 190. Liquid inlet pipe;

[0034] 2. Defoaming section; 20. Shell; 200. Liquid inlet; 201. Guide rail; 202. Support plate; 21. Bend; 22. Cover plate; 23. Second motor; 24. Drive shaft; 25. Cutter; 26. Outer ring; 260. Guide groove; 27. Inner ring; 270. Pull rod; 28. Filter screen. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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 protection scope of the present utility model.

[0036] This embodiment provides a technical solution:

[0037] Please see Figure 1 As shown, a defoaming device for a coating solution of an air knife coating machine includes a tank 1. The tank 1 has a defoaming chamber 10 and a storage chamber 11 respectively located on the upper and lower sides. A stirring assembly for defoaming is rotatably installed inside the defoaming chamber 10. A lift pump 19 is installed on one side of the top of the tank 1. An inlet pipe 190 is installed at the inlet of the lift pump 19 and extends into the bottom of the defoaming chamber 10.

[0038] Through the above configuration, the defoaming chamber 10 and the storage chamber 11 separated by the tank 1 achieve the zoning of the defoaming and storage functions of the coating solution. The defoaming chamber 10 focuses on eliminating bubbles, ensuring that the solution is fully processed in a relatively stable space; the storage chamber 11 is used to store the processed solution, preventing secondary bubbles from mixing in. The combination of the two makes the defoaming process more orderly, effectively improving the efficiency and quality of solution processing.

[0039] Please see Figures 1-2 As shown, the stirring assembly further includes a rotating shaft 15 rotatably mounted inside the tank 1. Multiple retaining rings 16 are coaxially keyed to the outer wall of the rotating shaft 15. Multiple stirring rods 17 are fixed to the outer wall of the retaining rings 16. Stirring blades 18 are fixed to the stirring rods 17. A first motor 14 for driving the rotating shaft 15 to rotate is installed on the top of the tank 1.

[0040] With the above settings, the stirring of the stirring blade 18 enhances the disturbance and shearing effect, which can more effectively break up stubborn bubbles and micro bubbles in highly viscous solutions compared to simple mechanical cutting.

[0041] In this embodiment, the stirring blade 18 is wavy and is tightly welded to the stirring rod 17. The wavy stirring blade 18 increases the contact area with the solution, generating stronger disturbance and shear force, which can effectively break up stubborn bubbles and micro bubbles in solutions with high viscosity and complex bubbles, thereby enhancing the defoaming effect in the defoaming chamber.

[0042] Please see Figure 1 As shown, in this embodiment, the bottom of the tank 1 is provided with a discharge pipe 12 connected to the tank 1, and a valve 13 is provided on the outside of the discharge pipe 12. The operator can flexibly open or close the valve 13 according to production needs to adjust the discharge speed and flow rate of the solution, ensuring that the solution supply matches the working rhythm of the air knife coating machine, and also facilitating the cleaning and maintenance of the device.

[0043] Please see Figures 3-5 As shown, the defoaming section 2 is installed on the upper front side of the tank body 1; it includes a shell 20 with an open top, and an inlet 200 connected to the inlet of the booster pump 19 is installed at the top of the outer wall of the shell 20; the bottom of the shell 20 is provided with a bent pipe 21 connected to the storage chamber 11, and the top of the shell 20 is provided with a detachable cover plate 22, and a second motor 23 is installed on the top of the cover plate 22; a drive shaft 24 is rotatably installed in the inner cavity of the shell 20, and the output shaft of the second motor 23 is coaxially keyed to the drive shaft 24; multiple cutters 25 for breaking up bubbles are coaxially keyed to the outer wall of the drive shaft 24; The inner cavity of the housing 20 is provided with an inner ring body 27 located below the cutter 25, and an outer ring body 26 is provided outside the inner ring body 27. Multiple tie rods 270 are fixed between the inner ring body 27 and the outer ring body 26, and the tie rods 270 are tightly welded to the inner ring body 27 and the outer ring body 26. The drive shaft 24 passes through the inner ring body 27 and is rotatably connected to the inner ring body 27. The drive shaft 24 is rotatably connected to the inner ring body 27 through a bearing. The drive shaft 24 is coaxially keyed to the inner ring of the bearing, and the inner ring body 27 is coaxially keyed to the outer ring of the bearing. A filter screen 28 for defoaming is provided at the top between the inner ring body 27 and the outer ring body 26.

[0044] With the above setup, the second motor 23 drives the drive shaft 24 and the cutter 25 to break up air bubbles, and the filter screen 28 between the inner ring body 27 and the outer ring body 26 filters and defoams. This multi-stage treatment effectively improves the adaptability to solutions with different bubble particle size distributions, enhances the defoaming effect, and ensures that the discharged solution meets the high-quality requirements of the air knife coating machine, targeting bubbles of different sizes.

[0045] In this embodiment, a support plate 202 is fixedly connected to the outer wall of the shell 20 by bolts, and the rear end of the support plate 202 is fixedly connected to the outer wall of the tank 1 by bolts. This structural design ensures that the defoaming section 2 remains stable during equipment operation, avoiding the normal operation of components such as the cutter 25 and the filter screen 28 due to vibration and other factors, and providing a reliable guarantee for continuous and efficient defoaming.

[0046] Please see Figure 3 As shown, in this embodiment, two guide rails 201 are fixed to the inner wall of the housing 20, and a guide groove 260 is provided on the outer wall of the outer ring 26 to slide and connect with the guide rails 201. This design guides the installation of the outer ring 26, preventing the outer ring 26 from rotating when the drive shaft 24 rotates, thereby ensuring the filtration performance of the filter screen 28.

[0047] In this embodiment, the gap between the cutter 25 and the filter screen 28 is 0.2-0.4 cm, and the cutter 25 is made of stainless steel. The preferred gap between the cutter 25 and the filter screen 28 is 0.3 cm. This design facilitates the cutter 25 in breaking up air bubbles trapped at the top of the filter screen 28, improving the defoaming effect; while the stainless steel material has the advantage of corrosion resistance, ensuring the service life of the cutter 25.

[0048] Please see Figure 1 As shown, in this embodiment, level gauges are installed on the upper and lower sides of the outer wall of the tank 1, and the level gauges are connected to the defoaming chamber 10 and the storage chamber 11, respectively. This design facilitates real-time feedback of liquid level information, allowing operators to adjust the liquid inlet speed and start or stop relevant components in a timely manner, preventing solution overflow or evacuation.

[0049] Understandably, the cover plate 22 is bolted to the housing 20. On one hand, the bolted connection structure is simple and robust, ensuring a tight fit between the cover plate 22 and the housing 20. During the operation of the defoaming section 2, this effectively prevents solution leakage and the intrusion of external impurities, maintaining a stable internal working environment and ensuring the normal operation of components such as the cutter 25 and the drive shaft 24. On the other hand, its disassembly and installation are convenient. When it is necessary to inspect, clean, or replace components inside the defoaming section 2, such as the cutter 25 and the filter screen 28, operators can quickly unscrew the bolts, remove the cover plate 22, and easily access the internal components, improving equipment maintenance efficiency.

[0050] In addition, the outer wall of the outer ring 26 fits into the interior of the housing 20. This design provides a stable support environment for components such as the inner ring 27 and the filter screen 28, reducing component shaking or displacement caused by solution flow impact, and ensuring the relative position stability between the cutter 25 and the filter screen 28; at the same time, this design also ensures the filtration effect.

[0051] It is worth noting that the first motor 14, the second motor 23, and the booster pump 19 involved in this embodiment are existing conventional technologies, and will not be described in detail here.

[0052] In practical use, firstly, the coating solution containing air bubbles enters the defoaming chamber 10 of the tank 1. At this time, the user turns on the power to the first motor 14, which starts. Driven by the first motor 14, the rotating shaft 15 drives the wave-shaped stirring blades 18, which are connected to the fixed ring 16 and the stirring rod 17, to rotate slowly, while simultaneously stirring the solution thoroughly, enhancing the disturbance and shearing effect, breaking up stubborn and tiny air bubbles in the highly viscous solution, and achieving preliminary defoaming. Subsequently, the user turns on the power to the lift pump 19, which starts and transports the preliminarily defoamed solution into the housing 20 through the inlet pipe 190. Then, the user... When the power supply to the second motor 23 is turned on, the second motor 23 starts, and the output shaft of the second motor 23 drives the transmission shaft 24 and the cutter 25 to rotate. The transmission shaft 24 and the cutter 25 break up large air bubbles in the solution. Next, the solution continues to flow downward and passes through the filter screen 28 between the inner ring body 27 and the outer ring body 26. The filter screen's pore structure intercepts and filters small air bubbles, achieving gas-liquid separation. At the same time, the cutter 25 further breaks up the air bubbles trapped at the top of the filter screen 28. Finally, the solution that has undergone multi-stage defoaming treatment flows into the storage chamber 11 through the bend pipe 21, completing the entire defoaming process. The treated solution is discharged through the discharge pipe 12 for use by the air knife coating machine.

[0053] 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 preferred examples and are not intended to limit the 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. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An air-knife coater solution bubble-removal device, characterized by, include: The tank (1) has a defoaming chamber (10) and a storage chamber (11) on the upper and lower sides respectively. A stirring assembly for defoaming is rotatably installed inside the defoaming chamber (10). A lift pump (19) is installed on one side of the top of the tank (1). An inlet pipe (190) is installed at the inlet of the lift pump (19). The inlet pipe (190) is inserted into the bottom of the defoaming chamber (10). The defoaming section (2) is installed on the upper front side of the tank (1); it includes a shell (20) with an open top, and an inlet (200) connected to the inlet of the booster pump (19) is installed at the top of the outer wall of the shell (20); the bottom of the shell (20) is provided with a bent pipe (21) connected to the storage chamber (11); the top of the shell (20) is provided with a detachable cover plate (22), and a second motor (23) is installed on the top of the cover plate (22); a drive shaft (24) is rotatably installed in the inner cavity of the shell (20), and the output shaft of the second motor (23) is coaxially keyed to the drive shaft (24); a plurality of cutters (25) for breaking bubbles are coaxially keyed to the outer wall of the drive shaft (24); The inner cavity of the housing (20) is provided with an inner ring body (27) below the cutter (25), and an outer ring body (26) is provided outside the inner ring body (27). Multiple pull rods (270) are fixed between the inner ring body (27) and the outer ring body (26). The drive shaft (24) passes through the inner ring body (27) and is rotatably connected to the inner ring body (27). A filter screen (28) for defoaming is provided at the top between the inner ring body (27) and the outer ring body (26).

2. The knife coater solution bubble-bleeding device of claim 1, wherein: The stirring assembly includes a rotating shaft (15) rotatably installed inside the tank (1), with multiple fixing rings (16) coaxially keyed to the outer wall of the rotating shaft (15), and multiple stirring rods (17) fixed to the outer wall of the fixing rings (16), with stirring blades (18) fixed to the stirring rods (17); a first motor (14) for driving the rotating shaft (15) to rotate is installed on the top of the tank (1).

3. The air knife coating machine coating solution defoaming device according to claim 2, characterized in that: The stirring blade (18) is wavy and is tightly welded to the stirring rod (17).

4. The defoaming device for the coating solution of the air knife coating machine according to claim 1, characterized in that: The bottom of the tank (1) is provided with a discharge pipe (12) connected to the tank (1), and a valve (13) is provided on the outside of the discharge pipe (12).

5. The defoaming device for the coating solution of the air knife coating machine according to claim 1, characterized in that: The outer wall of the shell (20) is fixedly connected to a support plate (202) by bolts, and the rear end of the support plate (202) is fixedly connected to the outer wall of the tank (1) by bolts.

6. The defoaming device for the coating solution of the air knife coating machine according to claim 1, characterized in that: The inner wall of the housing (20) is fixed with two guide rails (201), and the outer wall of the outer ring (26) is provided with a guide groove (260) that is slidably connected to the guide rails (201).

7. The defoaming device for the coating solution of the air knife coating machine according to claim 1, characterized in that: The gap between the cutter (25) and the filter screen (28) is 0.2-0.4cm, and the cutter (25) is made of stainless steel.

8. The defoaming device for the coating solution of the air knife coating machine according to claim 1, characterized in that: The tank (1) has level gauges installed on its upper and lower sides on its outer wall, and the level gauges are connected to the defoaming chamber (10) and the storage chamber (11) respectively.

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