A coating diluting device for water-based paint production

Abstract

The application relates to the technical field of paint dilution, in particular to a paint dilution device for water-based paint production, which comprises a dilution tank, a plug plate is arranged in the dilution tank, the plug plate divides the internal space of the dilution tank into a dilution chamber and a discharge chamber, stirring blades are rotationally arranged in the dilution chamber, a discharge port for connecting the dilution chamber and the discharge chamber is formed in the plug plate, a sliding plate for controlling the opening and closing of the discharge port is arranged at the discharge port, a mixing pipe is arranged outside the discharge port, a mixing medium hole is formed in one side of the mixing pipe close to the dilution chamber, a sliding pipe is slidably arranged in the mixing pipe, a plurality of first medium holes are formed in the sliding pipe, the first medium holes can selectively communicate with the mixing medium hole, and when the first medium holes communicate with the mixing medium hole, medium enters the dilution chamber through the mixing medium hole to mix and disturb the paint. The application is convenient for dilution or disturbance mixing.

Description

Technical Field

[0001] This application relates to the technical field of paint dilution, and in particular to a paint dilution apparatus for the production of water-based paints. Background Technology

[0002] Water-based coatings are coatings that use water as a solvent or dispersion medium. They are environmentally friendly, non-toxic, and non-flammable, and are widely used in construction, furniture, and automotive industries. In the production process of water-based coatings, an appropriate amount of diluent (usually water or a water-based thinner) needs to be added to the coating according to the product formulation and process requirements to adjust the consistency and achieve a suitable application viscosity. The dilution process directly affects the leveling properties, adhesion, and final coating effect of the coating, and is one of the key steps in the production of water-based coatings. With the continuous growth of market demand for water-based coatings, higher requirements are being placed on the dilution efficiency, uniformity, and automation level of coating dilution equipment.

[0003] Currently, dilution devices for water-based coating production are widely used in the industry. A comprehensive online search reveals that existing water-based coating dilution devices mainly consist of a dilution tank, a stirring assembly, and a feeding mechanism. The dilution tank has a feed inlet and a liquid inlet at the top, and an internal stirring shaft and stirring blades driven by a motor. The rotation of the stirring blades mixes the coating and the diluent. Some devices have a transparent viewing window and volume markings on the dilution tank for metering the added raw materials; others have an adjustable stirring assembly or scraper inside the tank to improve stirring efficiency or facilitate cleaning of the tank walls.

[0004] However, the existing technologies mentioned above still have the following drawbacks: First, the traditional stirring rod and stirring blade have a simple structure, and strong turbulence is only formed in the area near the stirring shaft during the stirring process. The coating around the inner wall and bottom of the dilution tank is difficult to be sufficiently disturbed, which can easily lead to uneven dilution of the coating in some areas. Second, the dilution medium is usually added from the top of the tank all at once or in a concentrated manner, which can easily cause differences in the concentration of the coating at different levels. Moreover, the initial mixing of the diluent and the coating is not sufficient, which can easily lead to clumping. Summary of the Invention

[0005] This application provides a paint dilution device for water-based paint production, which can at least partially solve the above-mentioned technical problems.

[0006] This application provides a paint dilution device for water-based paint production, which adopts the following technical solution: A paint dilution device for water-based paint production includes a dilution tank. An insert plate is installed inside the dilution tank, dividing its internal space into a dilution chamber and a discharge chamber. A stirring blade is rotatably installed inside the dilution chamber. An outlet is provided on the insert plate, connecting the dilution chamber and the discharge chamber. A sliding plate is provided at the outlet for controlling its opening and closing. A mixing tube surrounds the outside of the outlet. A mixing medium hole is provided on the side of the mixing tube closest to the dilution chamber. A sliding tube is slidably installed inside the mixing tube, and a plurality of first medium holes are provided on the sliding tube. The first medium holes can selectively communicate with the mixing medium holes. When the first medium holes communicate with the mixing medium holes, the medium enters the dilution chamber through the mixing medium holes to mix and agitate the paint.

[0007] By adopting the above technical solution, when connected, the medium enters the dilution chamber through the mixing medium hole to mix and agitate the coating; the dilution and discharge functions are divided by the baffle plate to minimize the direct entry of insufficiently diluted coating into the discharge area; the sliding plate controls the opening and closing of the discharge port to ensure that the coating is fully mixed in the dilution chamber without leakage during the dilution process; the mixing pipe is surrounded on the outside of the discharge port, and when the first medium hole is connected to the mixing medium hole, the medium enters the bottom area of ​​the dilution chamber from the outside of the discharge port through the mixing medium hole; airflow agitation is added on the basis of mechanical stirring by the stirring blades, so that the coating in the bottom and edge areas of the dilution chamber receives additional agitation force, which improves the problem of insufficient agitation around the tank and bottom caused by the traditional stirring device relying only on the rotation of the stirring blades; the medium enters from the outside of the discharge port, which can perform final homogenization treatment on the coating that is about to be discharged, and improve the dilution uniformity; the medium can be water or air, which facilitates dilution or increases agitation mixing.

[0008] Optionally, the dilution tank is further provided with a discharge auxiliary hole, and the sliding tube is provided with a plurality of second medium holes. The second medium holes can selectively communicate with the discharge auxiliary hole. When the mixing medium hole is connected with the first medium hole, the second medium hole is not connected with the discharge auxiliary hole.

[0009] By adopting the above technical solution, during the dilution stage, the medium enters the dilution chamber through the first medium hole and the mixing medium hole. At this time, the discharge auxiliary hole is not connected, ensuring that all medium flow is used for mixing and agitation within the dilution chamber, thus improving medium utilization efficiency. After dilution is completed, the position of the sliding tube is switched, and the second medium hole connects with the discharge auxiliary hole. The medium can then enter the discharge chamber through the discharge auxiliary hole, assisting in smoothly discharging the diluted coating and minimizing coating residue accumulation in the discharge chamber or outlet. This solution achieves selective flow of different medium pathways by switching the position of the same sliding tube. It has a compact structure, is easy to control, and allows for the introduction of water or air as the medium, facilitating dilution and discharge. Furthermore, it allows for uniform water replenishment based on the degree of dilution.

[0010] Optionally, the dilution tank is provided with a water storage chamber and a control valve. The water storage chamber is connected to the top of the dilution tank through a connecting pipe, and the water storage chamber is also connected to the middle and lower parts of the dilution tank through a bypass pipe. The control valve is provided on the connecting pipe and the bypass pipe respectively.

[0011] By adopting the above technical solution, dilution water in the water storage chamber can be added from the top via a connecting pipe, or simultaneously from the middle and bottom via a bypass pipe. Operators can choose different combinations of addition points according to dilution needs. Compared with the traditional method of adding dilution water only from the top of the tank at once, this solution allows dilution water to be added simultaneously or at different times from multiple heights, enabling the dilution water to be dispersed more quickly to each layer of the coating, shortening the diffusion path of the dilution water in the tank, and reducing local concentration differences.

[0012] Optionally, one end of the connecting pipe is connected to the bottom of the water storage chamber, and the other end is connected to the top of the dilution tank and communicates with the dilution chamber; one end of the bypass pipe is connected to the bottom of the water storage chamber, and the other end branches into at least two branch pipes, which are respectively connected to the middle and lower parts of the dilution tank and communicate with the dilution chamber.

[0013] By adopting the above technical solution, both the connecting pipe and the bypass pipe are led out from the bottom of the water storage chamber, ensuring that the dilution water in the water storage chamber can flow out naturally by gravity without the need for an additional power pump. The bypass pipe branches into at least two branches, which are respectively connected to the middle and lower parts of the dilution tank, allowing the dilution water to enter multiple depths of the dilution chamber simultaneously. Combined with the liquid addition through the top connecting pipe, synchronous liquid addition is achieved at the upper, middle, and lower heights of the dilution chamber, further accelerating the dispersion speed of the dilution water in the overall volume of the coating.

[0014] Optionally, the sealing plate is provided with a top disturbance tube, which is connected to the mixing tube and is provided with a sealing structure. When the second medium hole is connected to the discharge auxiliary hole, the sealing structure is conductive.

[0015] By adopting the above technical solution, when the sliding tube is in the discharge auxiliary position, the sealing structure is open, and the medium enters the top disturbance tube through the mixing tube and enters from the top of the dilution chamber, creating medium disturbance on the upper layer of coating in the dilution chamber. This solution allows the medium to enter from both the bottom (mixing medium hole) and the top (top disturbance tube) of the dilution chamber, achieving simultaneous medium disturbance from both above and below. During the discharge process, the sealing structure is open, and the top medium flow helps to push the diluent or light components floating on the upper layer of the coating downwards, allowing them to participate in the overall mixing; the top disturbance tube facilitates the dispersion of medium pressure at the discharge auxiliary hole position, reduces the discharge flow rate, and decreases the amount of medium mixed in.

[0016] Optionally, the top disturbance tube is inclined and faces the center of the dilution chamber.

[0017] By adopting the above technical solution, the medium flow introduced by the inclined top disturbance pipe is directly directed to the central area of ​​the dilution chamber, giving the top medium flow a clear directionality. The medium is injected obliquely from the top of the tank wall into the center of the tank, forming an asymmetrical flow field distribution in the dilution chamber. This creates cross-convection with the rising medium flow from the bottom mixing medium hole, enhancing the overall flow complexity and mixing degree of the coating in the dilution chamber and improving the dilution uniformity.

[0018] Optionally, the sealing structure is connected to the sliding tube.

[0019] Optionally, a weighing structure is provided at the bottom of the water storage chamber.

[0020] By adopting the above technical solution, the weighing structure can measure the weight of the water storage chamber and the dilution water inside in real time. The operator can accurately control the amount of dilution water added to the dilution chamber based on the weighing data, minimize the liquid addition error caused by visual estimation, and ensure the accuracy and consistency of the dilution ratio of different batches of paint.

[0021] Optionally, the connecting ends of the connecting pipe and the bypass pipe to the dilution chamber are flat.

[0022] By adopting the above technical solution, the flat connecting end allows the dilution water to flow out in the form of a flat fan-shaped jet when it enters the dilution chamber from the pipe. This increases the contact area between the dilution water and the original coating in the dilution chamber, allowing the dilution water to be distributed in the coating in a more dispersed form. Compared with the method of concentrated water discharge from a circular pipe opening, the flat outlet helps the dilution water to make a larger initial contact with the surrounding coating at the moment of entry, which is conducive to rapid and uniform dispersion.

[0023] Optionally, the tilt angle of the top disturbance tube relative to the horizontal direction is 30° to 60°.

[0024] By adopting the above technical solution, within this angle range, the medium flow introduced by the top disturbance pipe has both a sufficient downward component to penetrate the coating surface and advance towards the central area of ​​the tank, and an appropriate horizontal component to form a large sweeping coverage in the dilution chamber. This minimizes the problem of the medium flow only swirling near the tank wall due to an excessively small angle or the medium flow directly impacting the bottom of the tank due to an excessively large angle, thus causing local over-disturbance. This allows the top disturbance pipe to obtain a good medium flow coverage range and penetration depth, improving the effectiveness of the top medium disturbance.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The medium enters from the outside of the outlet, which can perform a final homogenization treatment on the coating that is about to be discharged, and improve the dilution uniformity; the medium can be water or air, which facilitates dilution or increases agitation and mixing. 2. This solution allows dilution water to be added simultaneously or at different times from multiple heights, enabling the dilution water to be dispersed more quickly to each layer of the coating, shortening the diffusion path of the dilution water in the tank, and reducing local concentration differences; 3. Minimize the angle so that the medium flow only swirls near the tank wall due to an excessively small angle or the medium flow directly impacts the bottom of the tank due to an excessively large angle, causing local over-disturbance. This will ensure that the top disturbance pipe has a good medium flow coverage and penetration depth, thereby improving the effectiveness of the top medium disturbance. Attached Figure Description

[0026] Figure 1 This is an overall structural diagram of the dilution device in this embodiment; Figure 2 This is an overall structural diagram of the dilution device from another perspective in this embodiment; Figure 3 This is a cross-sectional view of the dilution tank in this embodiment; Figure 4 This is a cross-sectional view of the mixing tube in this embodiment.

[0027] Explanation of reference numerals in the attached drawings: 100, dilution tank; 110, discharge pipe; 120, jacket; 200, insert plate; 210, discharge port; 220, sliding plate; 310, stirring blade; 320, drive motor; 400, mixing pipe; 410, mixing medium hole; 420, discharge auxiliary hole; 500, sliding pipe; 510, first medium hole; 520, second medium hole; 610, water storage chamber; 620, connecting pipe; 630, control valve; 640, bypass pipe; 710, top disturbance pipe; 720, sealing structure. Detailed Implementation

[0028] The following combination Figures 1 to 4 This application will be described in further detail.

[0029] Reference Figures 1 to 4A paint dilution device for water-based paint production includes a dilution tank 100, which is a vertical cylindrical structure. The top of the tank has an openable sealing plate, and the upper part of the side wall has a feed inlet and a liquid inlet. Inside the dilution tank 100, there is a horizontal plate 200, fixedly connected to the inner wall of the tank and dividing the internal space into a dilution chamber and a discharge chamber. A discharge pipe 110 is installed on the side wall of the tank, communicating with the discharge chamber and equipped with a valve. Inside the dilution chamber, there is a stirring blade 310 connected to the lower end of a longitudinally extending stirring shaft. The upper end of the stirring shaft extends through the sealing plate to the outside of the tank 100 and is connected to a drive motor 320, which is fixedly installed on the upper side of the sealing plate. A discharge port 210 is opened in the central area of ​​the plate 200, penetrating vertically and communicating with the discharge chamber. A sliding plate 220 is provided at the discharge port 210. The sliding plate 220 is attached to the upper surface of the insert plate 200 and can slide horizontally along the surface of the insert plate 200 to control the opening and closing of the discharge port 210.

[0030] A mixing pipe 400 is provided around the outer side of the discharge port 210. The mixing pipe 400 is fixedly installed on the side of the insert plate 200 and located in the dilution chamber. The mixing pipe 400 extends downward through the dilution tank 100 and connects to an air source. Furthermore, to facilitate the heat preservation or heating of the coating, a jacket 120 can be provided outside the dilution tank 100. Water flows through the jacket 120, and part of the mixing pipe 400 is located inside the jacket 120, which can pre-treat the medium in the mixing pipe 400. The mixing pipe 400 has a circular tube structure, surrounds the outer circumference of the discharge port 210, and is vertically arranged. On the side of the mixing pipe 400 near the dilution chamber, there are mixing medium holes 410. The mixing medium holes 410 are distributed at intervals along the length of the mixing pipe 400 and are inclined to the inner circumferential wall of the dilution tank 100. A sliding tube 500 is slidably disposed inside the mixing tube 400. The sliding tube 500 has a cylindrical structure, and its outer wall slides in fit with the inner wall of the mixing tube 400. The sliding tube 500 can slide up and down along the axial direction of the mixing tube 400. Multiple first medium holes 510 are formed on the wall of the sliding tube 500, and the first medium holes 510 are evenly distributed along the vertical direction of the sliding tube 500. By sliding the sliding tube 500, the first medium holes 510 can selectively communicate with the mixing medium holes 410. When the first medium holes 510 and the mixing medium holes 410 are directly opposite each other, they are connected, and the external medium enters the dilution chamber through the inner cavity of the sliding tube 500, the first medium holes 510, and the mixing medium holes 410, mixing and agitating the coating in the dilution chamber. The external medium can be compressed air or dilution water. In this embodiment, compressed air is preferably used as the agitation medium to utilize the good diffusivity of gas to form bubble agitation in the coating.

[0031] During use, the paint to be diluted is fed into the dilution chamber through the inlet, and dilution water is added to the dilution chamber through the liquid inlet or the water storage chamber 610. The drive motor 320 drives the stirring shaft and stirring blades 310 to rotate, initially mixing the paint and dilution water in the dilution chamber. At the same time, external compressed air enters the bottom area of ​​the dilution chamber through the sliding pipe 500 and the mixing medium hole 410, adding airflow disturbance on top of the mechanical stirring of the stirring blades 310. After dilution is completed, the sliding plate 220 slides to open the discharge port 210, and the diluted paint enters the discharge chamber and is discharged through the discharge port 210.

[0032] The dilution tank 100 is equipped with a water storage chamber 610, which is fixedly installed on the outer wall of the dilution tank 100. The water storage chamber 610 is connected to the top of the dilution tank 100 through a connecting pipe 620, and is also connected to the middle and lower parts of the dilution tank 100 through a bypass pipe 640. Control valves 630 are respectively installed on the connecting pipe 620 and the bypass pipe 640.

[0033] One end of the connecting pipe 620 is connected to the bottom of the water storage chamber 610, and the other end is connected to the top of the dilution tank 100 and communicates with the dilution chamber. One end of the bypass pipe 640 is connected to the bottom of the water storage chamber 610, and the other end branches into at least two branch pipes, which are respectively connected to the middle and lower parts of the dilution tank 100 and communicate with the dilution chamber. Both the connecting pipe 620 and the bypass pipe 640 extend from the bottom of the water storage chamber 610, and the dilution water in the water storage chamber 610 can flow naturally into the dilution chamber under the action of gravity. The communicating ends of the connecting pipe 620 and the bypass pipe 640 extend into the interior of the dilution chamber and are located below the paint liquid surface, with the communicating end of the connecting pipe 620 located in the upper region of the dilution chamber, and the communicating ends of the two branch pipes of the bypass pipe 640 located in the middle and lower regions of the dilution chamber, respectively. The operator can select to add dilution water from any one or more of the top, middle, and lower parts through the control valve 630, and flexibly adjust the combination of liquid addition positions according to the dilution needs.

[0034] A weighing structure is provided at the bottom of the water storage chamber 610. The weighing structure can be a weight measuring element in the form of a pressure sensor or an electronic scale, which is fixedly installed below the water storage chamber 610 and weighs the entire water storage chamber 610. The operator can accurately control the amount of dilution water added to the dilution chamber by reading the weighing data.

[0035] Both the connecting pipe 620 and the bypass pipe 640 have a flat structure at their connection points with the dilution chamber. A flat connection point means that the cross-section of the pipe opening is a flat rectangle or ellipse, so that the dilution water flows out of the connection point and enters the dilution chamber in a flat fan-shaped stream.

[0036] The discharge port 210 on the insert plate 200 has a through-hole structure, and the sliding plate 220 is a rectangular plate with a width greater than the diameter of the discharge port 210. The sliding plate 220 is attached to the upper surface of the insert plate 200, and one end of it is connected to a telescopic drive component fixedly installed on the inner wall of the dilution chamber or has a handle installed thereon, which is slid manually from the outside. In this example, a handle is preferably installed. In other embodiments, the telescopic drive component can be a cylinder or an electric push rod. The telescopic drive component extends and retracts, causing the sliding plate 220 to slide horizontally along the surface of the insert plate 200, thereby opening or closing the discharge port 210.

[0037] The sealing plate is equipped with a top disturbance pipe 710. In this embodiment, the top disturbance pipe 710 is preferably installed on the mixing pipe 400 and connected to the mixing pipe 400 through a pipe. The lower end of the top disturbance pipe 710 extends into the dilution chamber. The lower opening of the top disturbance pipe 710 is always located above the paint liquid surface in the dilution chamber to minimize the backflow of paint into the top disturbance pipe 710 during the disturbance process. The top disturbance pipe 710 is equipped with a sealing structure 720, which is used to control the opening and closing of the top disturbance pipe 710. The sealing structure 720 is a sliding plate or a sliding pipe. The sliding plate is attached to the inner or outer wall of the top disturbance pipe 710 and can slide in a direction perpendicular to the pipe and is connected to the sliding pipe 500. A through hole is opened on the sliding plate. When the sliding plate slides to the point where the through hole is directly aligned with the cavity of the top disturbance pipe 710, the sealing structure 720 is open; when the sliding plate slides to the point where the through hole is misaligned with the cavity, the sealing structure 720 is closed. The top disturbance tube 710 can be installed as needed, and it can be selected whether to connect synchronously with the mixing medium hole 410.

[0038] The sliding tube 500 is also provided with multiple second medium holes 520, which are distributed circumferentially along the sliding tube 500 and spaced apart from the first medium holes 510 along the axial direction of the sliding tube 500. A discharge auxiliary hole 420 is provided on the side wall or bottom of the discharge chamber of the dilution tank 100, and the discharge auxiliary hole 420 is inclined towards the middle of the discharge port 210. The second medium holes 520 can selectively communicate with the discharge auxiliary hole 420. When the mixing medium hole 410 is connected to the first medium hole 510, the second medium hole 520 is not connected to the discharge auxiliary hole 420. At this time, compressed air enters the dilution chamber through the first medium hole 510 and the mixing medium hole 410 to participate in mixing and agitation. When the sliding tube 500 slides to the point where the second medium hole 520 is connected to the discharge auxiliary hole 420, the first medium hole 510 and the mixing medium hole 410 are misaligned and not connected. Compressed air enters the discharge chamber through the second medium hole 520 and the discharge auxiliary hole 420, which helps to push the diluted coating out of the discharge chamber.

[0039] The top disturbance pipe 710 is inclined and faces the center of the dilution chamber. The lower end of the top disturbance pipe 710 is inclined towards the center of the dilution chamber, so that the airflow ejected from the top disturbance pipe 710 is directed towards the central area of ​​the dilution chamber. The inclination angle of the top disturbance pipe 710 relative to the horizontal direction is 30 degrees to 60 degrees. Within this angle range, the airflow introduced by the top disturbance pipe 710 has both a sufficient downward component to penetrate the coating surface and advance towards the central area of ​​the tank, and an appropriate horizontal component to form a large-area sweeping coverage within the dilution chamber. In this embodiment, the inclination angle of the top disturbance pipe 710 relative to the horizontal direction is preferably 45 degrees.

[0040] In other embodiments, the sliding tube 500 can be fixedly connected to the sliding plate 220 or slidably connected. When the sliding plate 220 moves up a certain distance, it can directly drive the sliding tube 500 to slide.

[0041] The stirring blades 310 include a stirring shaft and a plurality of stirring blades 310 fixedly mounted on the stirring shaft. The stirring shaft extends longitudinally to the central axis of the dilution chamber, and the stirring blades 310 are spaced apart along the axial direction of the stirring shaft. The stirring blades 310 include upper stirring blades 310 and lower stirring blades 310. The upper stirring blades 310 are located in the upper region of the dilution chamber, and the lower stirring blades 310 are located in the lower region of the dilution chamber. The length of the lower stirring blades 310 is greater than that of the upper stirring blades 310, so that the lower stirring blades 310 are closer to the inner wall of the dilution chamber, which is beneficial for providing a stronger stirring effect on the coating at the bottom of the tank. The stirring blades 310 can be plate-shaped straight blades or inclined blades. In this embodiment, inclined blades are preferred to generate an axial pushing effect on the coating during rotation, promoting the vertical circulation of the coating.

[0042] The following describes the usage process and technical effects of the technical solution in this application.

[0043] Before the dilution operation begins, the paint to be diluted is fed into the dilution chamber through the inlet. The operator determines the required amount of dilution water to add based on the paint formulation and process requirements, and precisely controls the amount of water added by monitoring the weight change of the dilution water in the water storage chamber 610 using a weighing structure. Depending on the dilution needs, the operator can choose to open the control valve 630 on the connecting pipe 620, the control valve 630 on the bypass pipe 640, or both simultaneously, allowing the dilution water to enter the dilution chamber from one or more points at the top, middle, and bottom. The dilution water flows out from each connecting end in a flat, fan-shaped stream, making extensive contact with the paint layers within the dilution chamber.

[0044] The drive motor 320 starts, causing the stirring shaft and stirring blades 310 to rotate within the dilution chamber, mixing the paint and dilution water. Simultaneously, an external compressed air source supplies air to the inner cavity of the sliding tube 500. The sliding tube 500 is currently in its first working position, with the first medium hole 510 directly connected to the mixing medium hole 410, and the second medium hole 520 misaligned and not connected to the discharge auxiliary hole 420. Compressed air passes through the inner cavity of the sliding tube 500, the first medium hole 510, and the mixing medium hole 410, entering the bottom region of the dilution chamber from the upper part of the mixing tube 400 outside the discharge port 210. The compressed air forms rising bubbles in the paint, disturbing the paint in the bottom and edge regions of the dilution chamber.

[0045] During the dilution process, the operator can choose whether to open the top disturbance pipe 710 as needed. When the sliding pipe 500 is in the first working position, the sealing structure 720 is closed, and the top disturbance pipe 710 is not ventilated. To enhance the disturbance effect in the upper part of the dilution chamber, the sliding pipe 500 can be briefly switched to the second working position. At this time, the sealing structure 720 is activated in conjunction with the sliding pipe 500, and compressed air is injected obliquely from the top of the dilution chamber into the middle of the dilution chamber through the mixing pipe 400 and the top disturbance pipe 710, creating airflow disturbance on the upper coating layer of the dilution chamber. After the switching is completed, the sliding pipe 500 can be returned to the first working position to continue dilution using the bottom air intake method.

[0046] After dilution, the telescopic drive unit drives the sliding plate 220 to slide along the surface of the insert plate 200, opening the discharge port 210. The diluted paint enters the discharge chamber through the discharge port 210. At this time, the sliding tube 500 is switched to the second working position, the first medium hole 510 and the mixing medium hole 410 are misaligned and not connected, and the second medium hole 520 is directly connected to the discharge auxiliary hole 420. Compressed air enters the discharge chamber through the second medium hole 520 and the discharge auxiliary hole 420, applying auxiliary thrust to the paint in the discharge chamber, accelerating the paint from the discharge chamber and reducing paint residue in the discharge chamber and at the discharge port 210.

[0047] During the discharge process, the sealing structure 720 is in a conductive state, and compressed air simultaneously enters the dilution chamber through the top disturbance pipe 710. Since the discharge port 210 is open at this time, the amount of residual paint in the dilution chamber gradually decreases, and the liquid level drops. The lower opening of the top disturbance pipe 710 is always located above the paint liquid surface. The airflow ejected from the top disturbance pipe 710 acts on the upper space of the dilution chamber, pushing down the light components that may float on the paint layer, so that they are discharged along with the main paint through the discharge port 210, minimizing the amount of light components remaining on the inner wall of the dilution chamber or the lower surface of the sealing plate.

[0048] This application uses a baffle plate 200 to separate the dilution chamber from the discharge chamber, making the dilution and discharge processes spatially independent and minimizing the direct entry of insufficiently diluted paint into the discharge area. A sliding plate 220 controls the opening and closing of the discharge port 210, ensuring that the paint is fully mixed within the dilution chamber without leakage during the dilution process. A mixing pipe 400 surrounds the discharge port 210, and compressed air enters the bottom area of ​​the dilution chamber from the periphery of the discharge port 210, adding airflow turbulence to the mechanical stirring of the agitator blades 310, providing additional turbulence to the paint in the bottom and edge areas of the dilution chamber. The compressed air entering from the outside of the discharge port 210 allows for final homogenization of the paint before discharge.

[0049] Diluent enters the top, middle, and bottom of the dilution chamber from the water storage chamber 610 via connecting pipe 620 and bypass pipe 640, respectively, allowing for simultaneous or staggered addition of diluent at multiple heights. This enables faster dispersion of the diluent into each layer of the coating, shortens the diffusion path of the diluent within the tank, and reduces local concentration differences. Both connecting pipe 620 and bypass pipe 640 extend from the bottom of the water storage chamber 610, allowing the diluent to flow out naturally by gravity, eliminating the need for an additional power pump. The flat connecting end allows the diluent to disperse into the coating in a fan-shaped stream, increasing the contact area and facilitating rapid and uniform dispersion. A weighing structure ensures precise metering of the added diluent, guaranteeing the accuracy of the dilution ratio.

[0050] A first medium hole 510 and a second medium hole 520 are simultaneously provided on the sliding tube 500. Selective conduction of different medium pathways is achieved by switching the position of the same sliding tube 500. During the dilution phase, the first medium hole 510 is open and the second medium hole 520 is closed, with all airflow used for mixing and agitation within the dilution chamber. During the discharge phase, the second medium hole 520 is open and the first medium hole 510 is closed, with compressed air entering the discharge chamber to assist in discharge. The structure is compact and control is simple.

[0051] The top agitation pipe 710 allows compressed air to enter from both the bottom and top of the dilution chamber, achieving simultaneous agitation of the medium from both above and below. During discharge, the top agitation pipe 710 is open, and the top airflow helps to push the diluent or light components floating on the surface of the coating downwards, allowing them to participate in overall mixing or be discharged with the coating. The top agitation pipe 710 is inclined towards the center of the dilution chamber, with the airflow directly pointing to the central area of ​​the dilution chamber, forming cross-convection with the rising airflow from the bottom mixing medium hole 410, enhancing the overall flow complexity and mixing degree of the coating within the dilution chamber. The sealing structure 720 is connected to the sliding pipe 500, achieving linkage control without the need for a separate drive element, reducing the number of components and the complexity of the control logic. The lower opening of the top agitation pipe 710 is always located above the coating surface, minimizing the backflow of coating from the dilution chamber into the top agitation pipe 710 during agitation.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A paint dilution device for water-based paint production, characterized in that: The device includes a dilution tank (100), inside which is a baffle plate (200) dividing the internal space of the dilution tank (100) into a dilution chamber and a discharge chamber. A stirring blade (310) is rotatably mounted inside the dilution chamber. A discharge port (210) connecting the dilution chamber and the discharge chamber is provided on the baffle plate (200). A sliding plate (220) for controlling the opening and closing of the discharge port (210) is provided at the discharge port (210). A mixing pipe (400) surrounds the outer side of the discharge port (210). The mixing tube (400) has a mixing medium hole (410) on the side near the dilution chamber. A sliding tube (500) is slidably disposed inside the mixing tube (400). A plurality of first medium holes (510) are provided on the sliding tube (500). The first medium holes (510) can selectively communicate with the mixing medium holes (410). When the first medium hole (510) communicates with the mixing medium hole (410), the medium enters the dilution chamber through the mixing medium hole (410) to mix and disturb the coating.

2. The paint dilution device for water-based paint production according to claim 1, characterized in that: The dilution tank (100) is also provided with a discharge auxiliary hole (420), and the sliding tube (500) is provided with a plurality of second medium holes (520). The second medium holes (520) can selectively communicate with the discharge auxiliary hole (420). When the mixing medium hole (410) is connected to the first medium hole (510), the second medium hole (520) is not connected to the discharge auxiliary hole (420).

3. The paint dilution device for water-based paint production according to claim 2, characterized in that: The dilution tank (100) is provided with a water storage chamber (610) and a control valve (630). The water storage chamber (610) is connected to the top of the dilution tank (100) through a connecting pipe (620). The water storage chamber (610) is also connected to the middle and lower parts of the dilution tank (100) through a bypass pipe (640). The control valve (630) is provided on the connecting pipe (620) and the bypass pipe (640).

4. The paint dilution device for water-based paint production according to claim 3, characterized in that: One end of the connecting pipe (620) is connected to the bottom of the water storage chamber (610), and the other end is connected to the top of the dilution tank (100) and communicates with the dilution chamber; one end of the bypass pipe (640) is connected to the bottom of the water storage chamber (610), and the other end branches into at least two branch pipes, which are respectively connected to the middle and lower parts of the dilution tank (100) and communicate with the dilution chamber.

5. The paint dilution apparatus for water-based paint production according to claim 4, characterized in that: The insert plate (200) is provided with a top disturbance tube (710), which is connected to the mixing tube (400) and is provided with a sealing structure (720). When the second medium hole (520) is connected to the discharge auxiliary hole (420), the sealing structure (720) is open.

6. The paint dilution apparatus for water-based paint production according to claim 5, characterized in that: The top disturbance tube (710) is inclined and faces the center of the dilution chamber.

7. The paint dilution apparatus for water-based paint production according to claim 5, characterized in that: The sealing structure (720) is connected to the sliding tube (500).

8. The paint dilution apparatus for water-based paint production according to claim 4, characterized in that: A weighing structure is provided at the bottom of the water storage chamber (610).

9. The paint dilution apparatus for water-based paint production according to claim 4, characterized in that: The connecting pipe (620) and the bypass pipe (640) are flat at their connecting ends to the dilution chamber.

10. The paint dilution apparatus for water-based paint production according to claim 6, characterized in that: The top disturbance tube (710) has an inclination angle of 30° to 60° relative to the horizontal direction.

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