An automatic cleaning mixing device for water-based coatings

Abstract

An automatic cleaning device for water-based coatings includes a mixing tank (1), a drive motor (2), a base box (3), a feed inlet (4), a water inlet (5), a hollow mixing shaft (6), mixing blades with spray nozzles (7), spray nozzles (7a), a sound insulation and heat preservation layer (8), an annular air duct (9), an air inlet pipe (10), a tank wall spray ring (11), a nozzle (11a), a discharge port (12), a liquid discharge port (13), a water pump (14), a cleaning agent tank (15), a liquid level sensor (16), a control system (17), and a base (18). This device utilizes a rotating mixing shaft and blades to effectively carry the cleaning solution through high-pressure rotary spraying, reducing the consumption of cleaning solvents and water, thus saving resources. The cleaning is thorough, ensuring no residue remains on the tank, mixing shaft, and blades, greatly reducing the risk of cross-contamination between different batches or colors of coatings.

Description

Technical Field

[0001] This utility model relates to a stirring device for automatic cleaning of water-based coatings, belonging to the field of water-based coating preparation technology. Background Technology

[0002] Water-based coatings often require mixing, dispersion, or color adjustment using agitation devices during production and use. After the existing agitation devices (such as mixing tanks and dispersers) have completed the mixing operation, a large amount of coating residue will adhere to the mixing shaft, mixing blades, and inner wall of the tank. Currently, the main method is to manually disassemble the mixing components for cleaning, or inject a large amount of cleaning solvent into the tank for manual / semi-automatic rinsing. This method has the following significant disadvantages: (1) Low cleaning efficiency and long time consumption: The manual disassembly, cleaning, and installation steps are cumbersome and take up a lot of production time. (2) Incomplete cleaning: Dead corners such as the back of the mixing blades and the root of the shaft are difficult to clean, which can easily cause cross-contamination between different batches of coatings. (3) Waste of resources: A large amount of cleaning solvent and water are required. (4) High labor intensity and poor environment: Manual operation is labor-intensive, there are safety hazards from contact with chemical solvents, and the cleaning process is prone to waste liquid splashing. (5) Low degree of automation: It is difficult to integrate into automated production processes.

[0003] Therefore, it is necessary to develop a device that can automatically, efficiently, and thoroughly clean the residue inside the mixing device of water-based coatings. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that a large amount of paint residue will adhere to the stirring shaft, stirring blades and inner wall of the tank after stirring. This invention proposes an automatic cleaning stirring device for water-based paint.

[0005] The technical solution of this utility model is as follows: an automatic cleaning mixing device for water-based coatings, including a mixing tank, a base, a drive motor and a base box, and also including a hollow mixing shaft, mixing blades with spray holes, a sound insulation and heat preservation layer, an annular air duct, a tank wall spray ring, a water pump, a cleaning agent tank, a liquid level sensor and a control system.

[0006] The mixing tank has a vertical structure. A base housing is installed on top of the mixing tank, and a drive motor is mounted on the base housing. A hollow stirring shaft is vertically mounted at the center of the mixing tank, with its upper end passing through the base housing and connected to the output shaft of the drive motor, which drives its rotation. The base housing has a hollow interior, communicating with multiple pre-set circular holes on the hollow stirring shaft. The stirring blades with spray nozzles are fixedly installed at the lower part of the hollow stirring shaft. Multiple cleaning spray nozzles communicating with internal branch channels are provided on the surface and lower part of the stirring blades. The stirring blades with spray nozzles have internal branch channels communicating with the cleaning fluid channel of the hollow stirring shaft. The mixing tank wall is... The mixing tank has a double-layer structure with an internal sound insulation and heat preservation layer. An annular duct is installed on the upper inner side of the sound insulation and heat preservation layer, with multiple nozzles pointing towards the tank wall and the stirring shaft. High-speed airflow generated by a blower is injected into the mixing tank through these nozzles via a pipe. A tank wall spray ring is located on the upper inner side of the sound insulation and heat preservation layer and below the annular duct. This annular spray ring has multiple nozzles pointing towards the tank wall and the stirring shaft, and is connected to a cleaning fluid supply system via an external pipeline. A liquid level sensor is installed on the upper inner wall of the tank, connected to a control unit, for detecting the liquid level. A control system is installed on the outer wall of the mixing tank.

[0007] The mixing tank is provided with a feed inlet at the top and a discharge outlet and a liquid outlet at the bottom, with a liquid outlet valve installed on the liquid outlet; a base is installed at the bottom of the mixing tank.

[0008] The cleaning nozzle is equipped with a miniature one-way valve or a spring-loaded pin structure. When there is no cleaning fluid pressure, the pin or valve core blocks the nozzle to prevent the paint from entering the nozzle and causing blockage during the stirring process. When there is cleaning fluid pressure, the spring pushes open the pin or valve core, and the nozzle opens.

[0009] The cleaning fluid supply system includes a water pump and a cleaning agent tank. The water pump delivers the cleaning agent from the cleaning agent tank to the annular spray pipe and the machine base.

[0010] The annular duct is connected to the air inlet pipe, which in turn connects to an external fan or air source.

[0011] The control system is electrically connected to the drive motor, the water pump or pipeline valves of the cleaning fluid supply system, and the drain valve. In the stirring operation mode, after material is added to the inlet, the control system starts the drive motor, driving the hollow stirring shaft and blades to rotate for stirring. At this time, the cleaning fluid pipeline is closed, and the drain valve is closed. When stirring is complete, the control system controls the discharge port to open, starting the discharge. After discharge, the control system controls the annular duct to push the water-based coating on the tank wall and stirring shaft down to the discharge port at the bottom of the mixing tank under the force of airflow and gravity, completing the discharge. In the cleaning operation mode: the cleaning fluid supply pipeline is opened, injecting the cleaning fluid solution into the cleaning fluid solution channels of the hollow stirring shaft and the tank wall spray ring. The drive motor is controlled to rotate the stirring shaft and blades (the speed can be set, usually lower than the stirring speed). Under pressure, the cleaning fluid solution passes through the branch channels within the cleaning fluid solution channels of the hollow stirring shaft blades, and finally is sprayed out at high speed from the cleaning nozzles on the blade surface, covering the surface of the stirring shaft, both sides of the blades, and the inner wall of the tank. After the preset cleaning time is reached, the cleaning fluid supply pipeline is closed. Open the drain valve to discharge the cleaning waste liquid from the tank. Refill with clean water and rotate the spray nozzle to clean again, then drain.

[0012] The beneficial effects of this invention are that the device can achieve automated cleaning of the stirring device. The cleaning program can be started with a single button press via the control system, eliminating the need for manual disassembly or complex operations, significantly reducing labor intensity and costs. The cleaning is highly efficient and thorough. Utilizing the rotating stirring shaft and blades as a carrier, the cleaning liquid is sprayed directly from inside the blades onto the blade surface (including the hard-to-clean back and root areas), achieving "source cleaning" and covering all dead angles. The rotating sprayed cleaning liquid generates scouring and shearing forces, effectively removing adhering paint residue. Combined with bottom drainage, waste liquid is quickly discharged, preventing secondary sedimentation.

[0013] Compared to traditional soaking or extensive rinsing, this novel device utilizes high-pressure rotary jet cleaning, which more effectively uses the cleaning solution, reducing the consumption of cleaning solvents and water, thus conserving resources. Thorough cleaning ensures no residue remains on the tank, stirring shaft, and blades, significantly reducing the risk of cross-contamination between different batches or colors of paint, guaranteeing product quality. The cleaning process is fast and efficient (typically completed within minutes), significantly shortening equipment preparation time and improving equipment utilization and overall production efficiency. It reduces manual cleaning operations, lowers the risk of operators coming into contact with chemicals and waste liquids, and improves the production environment.

[0014] The core cleaning function of this invention is integrated inside the mixing component. The overall structure is not significantly modified, making it easy to modify existing mixing equipment or integrate into new equipment, thus facilitating the automation control of the production line. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the stirring device for automatic cleaning of water-based coatings according to this utility model. In the diagram, 1 is the mixing tank; 2 is the drive motor; 3 is the base box; 4 is the feed inlet; 5 is the water inlet; 6 is the hollow mixing shaft; 7 is the mixing blade with spray nozzles; 7a is the spray nozzle; 8 is the sound insulation and heat preservation layer; 9 is the annular air duct; 10 is the air inlet pipe; 11 is the tank wall spray ring; 11a is the nozzle; 12 is the discharge port; 13 is the liquid discharge port; 14 is the water pump; 15 is the cleaning agent tank; 16 is the liquid level sensor; 17 is the control system; and 18 is the base. Detailed Implementation

[0016] The specific embodiments of this utility model are as follows: Figure 1 As shown.

[0017] This embodiment discloses an automatic cleaning mixing device for water-based coatings, comprising a mixing tank 1, a drive motor 2, a base box 3, a feed inlet 4, a water inlet 5, a hollow mixing shaft 6, mixing blades with spray nozzles 7, spray nozzles 7a, a sound insulation and heat preservation layer 8, an annular air duct 9, an air inlet pipe 10, a tank wall spray ring 11, a nozzle 11a, a discharge port 12, a liquid discharge port 13, a water pump 14, a cleaning agent tank 15, a liquid level sensor 16, a control system 17, and a base 18.

[0018] In this embodiment, the mixing tank 1 has a vertical structure with a base 18 at the bottom. The top of the mixing tank 1 has a feed inlet 4, and the bottom has a discharge outlet 12 and a drain outlet 13. The drain outlet 13 is equipped with a drain valve (such as a solenoid valve or a pneumatic valve) to control the opening and closing of the drain outlet 13. The drain outlet 13 can be connected to a filtration and recovery system to perform preliminary filtration and separation of the cleaning waste liquid and recover part of the cleaning liquid or coating.

[0019] A base box 3 is installed at the center of the top of the mixing tank 1, and a drive motor 2 is installed on the base box 3. A hollow stirring shaft 6 is vertically arranged in the central position inside the mixing tank 1, and its upper end passes through the base box and is connected to the output shaft of the drive motor 2, and is driven to rotate by the drive motor 2. The hollow stirring shaft 6 has a hollow structure, forming an axially penetrating cleaning fluid channel inside. The base box 3 has a hollow structure inside, and the cleaning water pumped in by the water pump 14 enters the hollow structure of the base box 3 and then enters multiple water inlets of the hollow stirring shaft 6. Stirring blades 7 with spray holes are fixedly installed at the lower part of the hollow stirring shaft 6 for water-based coatings in the mixing tank 1, and the stirring blades 7 with spray holes have branch channels inside that communicate with the cleaning fluid channel of the hollow stirring shaft. Multiple spray holes 7a are provided on the upper and lower surfaces of the stirring blades, which communicate with the internal branch channels.

[0020] In this embodiment, a miniature one-way valve or a spring-loaded pin structure can be installed inside the spray orifice 7a. When there is no cleaning fluid pressure, the pin or valve core blocks the spray orifice 7a under the action of the spring, preventing the paint from entering the spray orifice 7a and causing blockage during the stirring process. When there is cleaning fluid pressure, the pin or valve core is pushed open, and the spray orifice 7a opens. Some cleaning spray orifices can be designed as adjustable-angle nozzles to optimize the spray coverage.

[0021] In this embodiment, the mixing tank wall has a double-layer structure, with a sound-insulating and heat-preserving layer 8 sandwiched between the layers. This layer incorporates a ring-shaped air duct and a tank wall spray ring, encircling the tank body, while the nozzles are directly installed inside the tank wall. This structure not only significantly reduces equipment operating noise and improves thermal efficiency but also achieves efficient, automatic cleaning without blind spots or gaps.

[0022] In this embodiment, an annular air duct 9 is provided on the upper side of the sound insulation and heat preservation layer inside the mixing tank. The annular air duct 9 is equipped with multiple nozzles facing the tank wall and the mixing shaft. The high-speed airflow generated by the fan is introduced into the mixing tank 1 through the air inlet pipe 10, so that the water-based coating on the tank wall and the mixing shaft falls to the bottom discharge port of the mixing tank under the action of airflow and gravity. The control unit can control its opening and closing at the same time.

[0023] In this embodiment, a tank wall spray ring 11 is installed on the upper side inside the sound insulation and heat preservation layer of the mixing tank, below the annular air duct. The tank wall spray ring 11 has multiple nozzles 11a on its annular tube pointing towards the tank wall and the mixing shaft. The tank wall spray ring 11 is connected to a cleaning fluid supply system via an external pipeline. This design serves as an auxiliary cleaning method, allowing for a more thorough cleaning of the top of the tank wall and the upper end of the mixing shaft. The control unit can simultaneously control its opening and closing.

[0024] The cleaning fluid supply system of this embodiment consists of a water pump 14, a cleaning agent tank 15, and pipelines. The water pump 14 delivers the cleaning agent solution in the cleaning agent tank 15 to the tank wall spray ring 11 and the machine base box 3 through the pipelines.

[0025] A liquid level sensor 16 is installed on the upper part of the inner wall of the mixing tank and connected to the control unit. It is used to detect the liquid level, prevent dry running during mixing, or control the amount of cleaning solution injected during cleaning.

[0026] The outer shell of the mixing tank in this embodiment is equipped with a control system 17, including controller components such as microprocessors.

[0027] In this embodiment, the control system 17 is connected to the drive motor 2, the water pump 14, the drain valve, etc. The control system is used for stirring operations, cleaning operations, and control during the operation of the device.

[0028] In the mixing operation mode, after material is added to the inlet, the control system 17 starts the drive motor 2, which drives the hollow mixing shaft 6 and the mixing blades with spray nozzles to rotate and perform mixing. At this time, the cleaning fluid pipeline is closed and the drain valve is closed. When mixing is complete, the control system controls the discharge port to open and start discharging. After discharging is completed, the control system controls the annular air duct 9 to push the water-based coating on the tank wall and the mixing shaft down to the discharge port at the bottom of the mixing tank under the action of airflow and gravity, and the discharging is completed.

[0029] During the cleaning operation: Open the cleaning fluid supply line to inject cleaning solution into the cleaning solution channels of the hollow stirring shaft 6 and the tank wall spray ring 11. Control the drive motor 2 to rotate the hollow stirring shaft 6 and the stirring blades 7 with spray nozzles (the speed can be set, usually lower than the stirring speed). Under pressure, the cleaning solution flows through the branch channels within the cleaning fluid channels of the hollow stirring shaft 6 blades, and finally is sprayed out at high speed from the cleaning nozzles on the blade surface, covering the surface of the stirring shaft, both sides of the blades, and the inner wall of the tank. After the preset cleaning time is reached, close the cleaning fluid supply line. Open the drain valve to discharge the cleaning waste liquid from the tank. Re-inject clean water for rotating spraying, and then discharge.

[0030] The device in this embodiment can automatically start the cleaning program after the stirring operation is completed. It uses the tank wall spray ring, the hollow stirring shaft, and the stirring blades with spray holes as the cleaning liquid channel to perform efficient and thorough rotary spray cleaning on the hollow stirring shaft, the stirring blades with spray holes, and the inner wall of the tank. This significantly improves cleaning efficiency and effect, reduces labor costs and resource consumption, and reduces the risk of cross-contamination.

Claims

1. A stirring device for automatic cleaning of water-based coatings, comprising a stirring tank, a base, a drive motor, and a base housing, characterized in that, The mixing tank has a vertical structure. The base box is installed on top of the mixing tank, and a drive motor is mounted on the base box. The interior of the base box is hollow and communicates with a hollow stirring shaft. A hollow stirring shaft is vertically installed in the center of the mixing tank. The upper end of the hollow stirring shaft passes through the base box and connects to the output shaft of the drive motor, which drives its rotation. The hollow stirring shaft communicates with the base box through multiple circular holes distributed on it. Stirring blades with spray nozzles are fixedly installed on the lower part of the hollow stirring shaft. The upper and lower parts of the surface of the stirring blades are provided with multiple cleaning spray nozzles that communicate with the internal branch flow channels. The interior of the stirring blades with spray nozzles is provided with branch flow channels that communicate with the cleaning fluid channels of the hollow stirring shaft. The mixing tank has a double-layered wall structure with an internal sound insulation and heat preservation layer. An annular duct is installed on the upper inner side of the sound insulation and heat preservation layer, with multiple nozzles pointing towards the tank wall and the mixing shaft. High-speed airflow generated by a blower is injected into the mixing tank through these nozzles via the duct. A tank wall spray ring is located on the upper inner side of the sound insulation and heat preservation layer and below the annular duct. This annular spray ring has multiple nozzles pointing towards the tank wall and the mixing shaft, and is connected to a cleaning fluid supply system via an external pipeline. A liquid level sensor is installed on the upper inner wall of the tank, connected to a control unit, for detecting the liquid level. A control system is installed on the outer wall of the mixing tank.

2. The stirring device for automatic cleaning of water-based coatings according to claim 1, characterized in that, The mixing tank is provided with a feed inlet at the top and a discharge outlet and a liquid outlet at the bottom, with a liquid outlet valve installed on the liquid outlet; a base is installed at the bottom of the mixing tank.

3. The stirring device for automatic cleaning of water-based coatings according to claim 1, characterized in that, The cleaning nozzle is equipped with a miniature one-way valve or a spring-loaded pin structure. When there is no cleaning fluid pressure, the pin or valve core blocks the nozzle under the action of the spring, preventing the paint from entering the nozzle and causing blockage during the stirring process.

4. The stirring device for automatic cleaning of water-based coatings according to claim 1, characterized in that, The cleaning fluid supply system includes a water pump and a cleaning agent tank. The water pump delivers the cleaning agent from the cleaning agent tank to the annular spray pipe and the machine base.

5. The stirring device for automatic cleaning of water-based coatings according to claim 1, characterized in that, The annular duct is connected to the air inlet pipe, and the air inlet pipe is connected to the external fan.

6. The stirring device for automatic cleaning of water-based coatings according to claim 1, characterized in that, The control system is electrically connected to the drive motor, water pump, and drain valve, respectively.

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