An automatic mixing mechanism

Abstract

The utility model relates to paint mixing technical field, and disclose an automatic mixing mechanism, and the storage tank is used for storing curing agent and paint, and is equipped with the stirring device for preventing material deposition on every storage tank, metering conveying device links together with the storage tank group, including conveying main pipe, conveying branch pipe, flow sensor and metering pump, flow sensor and metering pump are installed on conveying branch pipe, mixing tank is used for the material that comes from the full mixing of storage tank feeding, and the mixing tank bottom is equipped with the discharge gate, and the mixing tank and conveying main pipe are connected through conveying branch pipe, and the control system adopts PLC programmable logic controller, the utility model discloses adopting PLC control and adjustable plunger pump to realize accurate proportioning, combines double helix and Z shape blade three -dimensional stirring, ensures that material mixes evenly and the proportioning error is small, and multiple component storage tank expands and adapts the diversification material demand of automobile parts paint spraying.

Description

Technical Field

[0001] This utility model belongs to the field of coating mixing technology, specifically relating to an automatic mixing mechanism. Background Technology

[0002] In the field of automotive parts painting, the precision of the coating mixing process directly affects key properties such as coating adhesion, gloss, and corrosion resistance.

[0003] Traditional manual feeding or mechanical metering devices struggle to precisely control the mixing ratio of hardener and paint, easily leading to unstable coating performance due to operational errors. This is especially problematic in mass production of automotive parts, where ratio deviations can trigger large-scale rework. Conventional mixing structures (such as single spiral blades) have limited effectiveness in mixing high-viscosity paints and hardeners, and materials are prone to sedimentation and stratification in the storage tank, resulting in defects such as color differences or sagging in the sprayed coating. Furthermore, the lack of real-time monitoring and feedback systems prevents dynamic adjustment of mixing parameters based on automotive part painting processes. Mixing multi-component materials (such as those with added flame retardants) requires manual equipment modification, resulting in poor compatibility and difficulty in adapting to flexible production requirements.

[0004] Traditional paint mixing relies heavily on manual metering and stirring. With the increasing demand for automated production of automotive parts, higher requirements are being placed on the uniformity of mixing, the accuracy of proportions, and the compatibility of equipment for materials such as hardeners and paints. Existing mixing technologies need to adapt to the diverse production scenarios of automotive parts while meeting environmental standards for sealing and low-loss requirements in the paint mixing process. Therefore, there is an urgent need for a highly automated mixing mechanism that can handle multi-component materials. Utility Model Content

[0005] The present invention aims to solve the technical problems in the prior art, such as large ratio deviations and uneven mixing caused by manual metering and single-blade stirring, which easily lead to unstable coating performance of automotive parts, low degree of automation, and lack of multi-component expansion capabilities.

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

[0007] An automatic mixing mechanism, comprising:

[0008] The storage tank comprises two separate sealed storage tanks for storing curing agent and paint respectively, each equipped with a stirring device to prevent material sedimentation;

[0009] The metering and conveying device, which is connected to the storage tank group, includes a main conveying pipe, a branch conveying pipe, a flow sensor, and a metering pump. The flow sensor is used to monitor the conveying flow rate of the material in real time, and the metering pump accurately controls the conveying amount of the material according to the instructions of the control system. The flow sensor and the metering pump are installed on the branch conveying pipe.

[0010] The mixing tank is used to fully mix the materials fed from the storage tank. The mixing tank has a discharge port at the bottom and is connected to the main conveying pipe through a conveying branch pipe.

[0011] Preferably, the metering pump is an adjustable flow plunger pump that can meet the needs of different mixing ratios. The flow sensor is located at the suction end of the metering pump, where the fluid pressure is relatively low, which can reduce the impact of high pressure on the flow sensor.

[0012] Preferably, the discharge port at the bottom of each storage tank is connected to the main conveying pipe, and each main conveying pipe is equipped with several conveying branches, the discharge ports of which are connected to the inlet of the mixing tank.

[0013] Preferably, the storage tank is installed on the storage rack, and the stirring device includes a stirring motor A installed on the top of the storage tank, a stirring shaft A extending into the storage tank and fixedly connected to the end of the output shaft of the stirring motor A, and stirring blades A provided on the stirring shaft A.

[0014] Preferably, the stirring blade A includes two spiral blades symmetrically mounted on and connected to the stirring shaft A, and several layers of Z-shaped blades arranged vertically at equal intervals on the stirring shaft A and located inside the two spiral blades. Each layer of Z-shaped blades is arranged in a ring at equal intervals on the outer side of the stirring shaft A.

[0015] As a preferred option, the storage rack is equipped with a protective ladder to assist maintenance personnel in climbing to the top of the storage tank.

[0016] Preferably, the mixing tank is embedded in a stepped support, and the metering pump on the delivery branch pipe is also installed on the stepped support.

[0017] Preferably, the mixing tank uses an agitator installed on it to mix the materials evenly. The agitator includes an agitator motor B installed on the top of the mixing tank, an agitator shaft B extending into the mixing tank and fixedly connected to the end of the output shaft of the agitator motor B, and agitator blades B provided on the agitator shaft B.

[0018] Preferably, the stirring blade B includes a mixing disk fixed to the bottom of the stirring shaft B and mixing blades arranged in a ring at equal distances at the upper and lower ends of the mixing disk and staggered.

[0019] Preferably, the control system adopts a PLC programmable logic controller. The operator inputs the mixing ratio and total mixing amount of hardener and paint through the touch screen on the PLC programmable logic controller. The PLC programmable logic controller controls the opening and closing of the metering pump and the flow rate according to the set parameters, and monitors the data of the flow sensor in real time to make feedback adjustments to ensure the accuracy of the mixing ratio. At the same time, the control system can also set the mixing time and control the speed of the stirring blades and the mixing time in the mixing tank.

[0020] Compared with the prior art, the technical effects and advantages of this utility model are:

[0021] This automatic mixing mechanism stores materials such as hardeners and paints in independent sealed storage tanks. The internal mixing device uses a combination of spiral and Z-shaped blades to achieve three-dimensional mixing of materials through vertical circulation and horizontal diffusion, preventing sedimentation. In the metering and conveying device, an adjustable-flow plunger pump precisely controls the material delivery volume according to PLC control system instructions. A flow sensor installed at the pump's suction end monitors the flow rate in real time and feeds it back to the system, forming a closed-loop regulation to ensure accurate proportioning. After the materials enter the mixing tank through the main and branch pipes, they are stirred in multiple directions by an agitator composed of a mixing disc and staggered mixing blades. After the set mixing time is reached, the uniformly mixed material is discharged through the discharge valve.

[0022] The metering pump features adjustable flow characteristics to adapt to different mixing ratio requirements; the flow sensor's low-pressure zone installation design reduces impact and improves measurement accuracy; the staggered blade structure of the mixing tank's agitator generates multi-dimensional mixing force, ensuring uniform mixing of materials. The storage tank's combined agitator blades effectively prevent material sedimentation, and the storage rack's protective ladder facilitates safe maintenance; the mixing tank is embedded in a stepped support frame, providing a stable structure and facilitating equipment layout.

[0023] The PLC touchscreen enables intuitive parameter input and automated control, with real-time feedback and adjustment to ensure accurate proportions. The system supports expansion to include multi-component materials such as curing agents, paints, and flame retardants. By adding storage tanks, it can be adapted to different mixing processes, offering high flexibility and practicality. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the storage tank of this utility model;

[0026] Figure 3 This is a schematic diagram of the internal structure of the storage tank of this utility model;

[0027] Figure 4 This is a schematic diagram of the mixing disc and mixing blades of this utility model.

[0028] In the diagram: 1. Storage tank; 2. Agitator; 21. Agitator motor A; 22. Agitator shaft A; 23. Spiral blades; 24. Z-shaped blades; 3. Main conveying pipe; 4. Branch conveying pipe; 5. Metering pump; 6. Mixing tank; 7. Feed nozzle; 8. Protective ladder; 9. Stepped support; 10. Agitator motor B; 11. Agitator shaft B; 12. Mixing disc; 13. Mixing blades; 14. Storage rack; 15. Discharge port; 16. Discharge valve. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] The following combination Figures 1 to 4 This application will be described in further detail.

[0031] This application discloses an automatic mixing mechanism, including a storage tank 1, a metering and conveying device, a mixing tank 6, and a control system. The metering and conveying device is used to quantitatively convey the material in the storage tank 1 to the mixing tank 6.

[0032] The storage tank 1 comprises two independent sealed storage tanks 1 for storing curing agent and paint respectively. Each storage tank 1 is equipped with a stirring device 2 to prevent material sedimentation. A metering and conveying device is connected to the storage tank 1 group and includes a main conveying pipe 3, conveying branch pipes 4, a flow sensor, and a metering pump 5. The flow sensor is used to monitor the material flow rate in real time. The discharge port 15 at the bottom of each storage tank 1 is connected to the main conveying pipe 3. Each main conveying pipe 3 is equipped with several conveying branch pipes 4, and the discharge port 15 of each conveying branch pipe 4 is connected to the inlet 7 of the mixing tank 6. The mixing tank 6 is used to thoroughly mix the materials fed from the storage tanks 1. The mixing tank 6 has a discharge port 15 at its bottom, and the mixing tank 6 and the main conveying pipe 3 are connected via the conveying branch pipes 4. A discharge valve 16 is provided at the discharge port 15.

[0033] When the automatic mixing mechanism is working, the curing agent and paint in storage tank 1 are kept in a uniform state under the action of the stirring device 2 to prevent sedimentation. The metering pump 5 in the metering and conveying device accurately controls the material conveying amount according to the instructions of the control system, and conveys the material in storage tank 1 to mixing tank 6 through the main conveying pipe 3 and the branch pipes. The flow sensor monitors the conveying flow in real time and feeds it back to the control system to achieve precise batching. In mixing tank 6, the agitator thoroughly mixes the material. After the set mixing time and mixing effect are achieved, the discharge valve 16 of the discharge port 15 is opened to discharge the mixed material.

[0034] The metering pump 5 precisely controls the material delivery rate according to the instructions of the control system. The flow sensor and the metering pump 5 are installed on the delivery branch pipe 4. The metering pump 5 is an adjustable flow plunger pump that can meet the requirements of different mixing ratios. The flow sensor is located at the suction end of the metering pump 5. The fluid pressure is relatively low, which reduces the impact of high pressure on the flow sensor.

[0035] Metering pump 5 is an adjustable flow plunger pump, which can meet different mixing ratio requirements and accurately control the material delivery rate. The flow sensor is located at the suction end of metering pump 5, where the fluid pressure is low, which reduces the impact of high pressure on the sensor, improves measurement accuracy and sensor lifespan, and ensures accurate mixing ratio.

[0036] The storage tank 1 is mounted on the storage rack 14. The stirring device 2 includes a stirring motor A21 mounted on the top of the storage tank 1, a stirring shaft A22 extending into the storage tank 1 and fixedly connected to the output shaft end of the stirring motor A21, and stirring blades A mounted on the stirring shaft A22. The stirring blades A include two spiral blades 23 symmetrically mounted and connected on the stirring shaft A22, and several layers of Z-shaped blades 24 arranged vertically at equal intervals on the stirring shaft A22 and located inside the two spiral blades 23. Each layer of Z-shaped blades 24 is arranged in a ring at equal intervals on the outer side of the stirring shaft A22. The storage rack 14 is equipped with a protective ladder 8 to assist maintenance personnel in climbing to the top of the storage tank 1.

[0037] The spiral blades 23 of the stirring blades A can drive the material to circulate up and down, while the Z-shaped blades 24 can enhance the mixing effect of the material in the horizontal direction, making the material more uniformly mixed, effectively preventing sedimentation, and ensuring the stability and uniformity of the material in the storage tank 1, thus providing a guarantee for subsequent precise batching and high-quality mixing. The protective ladder 8 of the storage rack 14 facilitates the safe climbing of maintenance personnel to the top of the tank for maintenance and repair work.

[0038] The mixing tank 6 is embedded in the stepped support 9, and the metering pump 5 on the delivery pipe 4 is also mounted on the stepped support 9. The mixing tank 6 mixes the materials evenly by means of an agitator mounted on it. The agitator includes an agitator motor B10 mounted on the top of the mixing tank 6, an agitator shaft B11 extending into the mixing tank 6 and fixedly connected to the end of the output shaft of the agitator motor B10, and agitator blades B provided on the agitator shaft B11. The agitator blades B include a mixing disk 12 fixed to the bottom of the agitator shaft B11 and mixing blades 13 arranged in a ring at equal distances at the upper and lower ends of the mixing disk 12 and staggered.

[0039] The mixing tank 6 is embedded in the stepped support 9, ensuring a stable structure. The mixing disc 12 of the stirring blades B and the staggered mixing blades 13, driven by the stirring motor B10, enable the materials entering the mixing tank 6 to be subjected to stirring forces in different directions, achieving thorough and uniform mixing and ensuring stable quality and consistent performance of the mixed materials.

[0040] The control system employs a PLC (Programmable Logic Controller). Operators input the mixing ratio and total amount of hardener and paint via the touchscreen on the PLC. The PLC controls the opening and closing of the metering pump 5 and its flow rate based on the set parameters, while also monitoring the flow sensor data in real time and providing feedback adjustments to ensure the accuracy of the mixing ratio. Simultaneously, the control system can also set the mixing time and control the rotation speed and mixing time of the agitator blades in the mixing tank 6.

[0041] Employing a PLC programmable logic controller, the system allows for convenient and intuitive operation with parameter input via a touchscreen. It precisely controls the metering pump and monitors the flow sensor, ensuring accurate mixing ratios. Furthermore, it allows for setting mixing time and controlling the agitator speed and timing, achieving automated control, improving mixing efficiency and quality, reducing manual operation errors and labor intensity, and facilitating production process monitoring and management.

[0042] Metering pump 5 can be a plunger pump from the Italian company SEKO. For example, if the flow rate requirement is small, SEKO's D-series plunger pump can be selected, with a flow rate range of 0.1 to 100 L / h and a pressure up to 10 MPa, which can meet the requirements for precise delivery of hardeners and paints; if the flow rate requirement is large, SEKO's E-series plunger pump can be considered, with a flow rate range of 1 to 500 L / h and a maximum pressure of 20 MPa.

[0043] For conveying liquid materials such as curing agents and paints, electromagnetic flow meters or mass flow meters can be selected. For higher accuracy requirements, the PromagW series electromagnetic flow meter from Krohne is recommended, offering accuracy up to ±0.2%, adaptability to different pipe diameters and flow ranges, and excellent corrosion resistance. If mass flow measurement is more critical, the Emerson MicroMotion series mass flow meter is a good choice, offering high accuracy, good stability, and direct measurement of mass flow rate, unaffected by changes in fluid density, temperature, and pressure.

[0044] For small and medium-sized mixing systems, Siemens S7-1200 series PLCs, such as the CPU1214CDC / DC / DC model, are recommended. These PLCs feature 14 digital inputs, 10 digital outputs, and 2 analog inputs, meeting the control requirements of most mixing systems. They can also be easily connected to touchscreens for parameter input and monitoring. For large mixing systems, Siemens S7-1500 series PLCs, such as the CPU1515-2PN, can be used, offering more powerful processing capabilities and communication functions.

[0045] In addition, different storage tanks 1 can be set up according to different mixing components. For example, three storage tanks 1 are needed for mixing three materials: curing agent, flame retardant and paint.

[0046] The automatic mixing mechanism stores materials such as curing agents and paints in independently sealed storage tanks 1, with the stirring device 2 inside the tanks continuously operating to prevent material sedimentation. The metering pump 5 in the metering and conveying device precisely controls the conveying volume of each material based on the adjustable flow characteristics of the plunger pump, according to the control system commands. A flow sensor monitors the conveying flow rate in real time and feeds it back to the PLC system, forming a closed-loop regulation to ensure accurate proportioning. After the materials enter the mixing tank 6 through the main conveying pipe 3 and branch pipes, the agitator achieves multi-directional mixing through the synergistic action of the mixing disc 12 and the staggered mixing blades 13. After the set mixing time is reached, the uniformly mixed material is discharged through the discharge valve 16.

[0047] The independent storage tank 1, combined with the spiral blade 23 and the Z-shaped blade, forms a three-dimensional mixing structure that enables the material to circulate vertically and diffuse horizontally, effectively preventing sedimentation. The metering pump 5 is an adjustable flow plunger pump, combined with a flow sensor installation design in the low-pressure zone of the suction end, which not only meets different mixing ratio requirements but also reduces the wear of the sensor by high-pressure impact, thus improving metering accuracy.

[0048] The mixing tank 6 is embedded in the stepped support 9 for installation, which is structurally stable. The mixing disc 12 of its agitator and the staggered blade design can generate multi-dimensional mixing force to ensure that the materials are fully mixed. The storage rack 14 is equipped with a protective ladder 8 to facilitate safe maintenance by maintenance personnel. The overall layout takes into account both functionality and operability.

[0049] The system uses a PLC programmable logic controller paired with a touch screen, allowing operators to intuitively input parameters such as mixing ratio and total mixing volume. The system automatically controls the start and stop of metering pump 5, flow rate adjustment, and the speed and time of the agitator. It achieves dynamic feedback adjustment by monitoring flow sensor data in real time, which not only reduces human error but also improves mixing efficiency through automated processes. It also supports extended configurations for multi-component materials (such as adding flame retardants), making it highly adaptable.

[0050] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic mixing mechanism, characterized in that, include: Storage tank (1), comprising two separate sealed storage tanks (1) for storing curing agent and paint respectively, each storage tank (1) being equipped with a stirring device (2) for preventing material sedimentation; The metering and conveying device is connected to the storage tank (1) group and includes a conveying main pipe (3), a conveying branch pipe (4), a flow sensor and a metering pump (5). The flow sensor is used to monitor the conveying flow rate of the material in real time, and the metering pump (5) accurately controls the conveying amount of the material according to the instructions of the control system. The flow sensor and the metering pump (5) are installed on the conveying branch pipe (4). The mixing tank (6) is used to fully mix the material fed from the storage tank (1). The bottom of the mixing tank (6) is provided with a discharge port (15). The mixing tank (6) and the conveying main pipe (3) are connected by a conveying branch pipe (4).

2. The automatic mixing mechanism according to claim 1, characterized in that: The metering pump (5) is an adjustable flow plunger pump that can meet the requirements of different mixing ratios, and the flow sensor is located at the suction end of the metering pump (5).

3. The automatic mixing mechanism according to claim 1, characterized in that: The discharge port (15) at the bottom of each storage tank (1) is connected to the conveying main pipe (3). Each conveying main pipe (3) is provided with several conveying branch pipes (4). The discharge port (15) of the conveying branch pipes (4) is connected to the feed nozzle (7) on the mixing tank (6).

4. The automatic mixing mechanism according to claim 1, characterized in that: The storage tank (1) is installed on the storage rack (14), and the stirring device (2) includes a stirring motor A (21) installed on the top of the storage tank (1), a stirring shaft A (22) extending into the storage tank (1) and fixedly connected to the end of the output shaft of the stirring motor A (21), and stirring blades A provided on the stirring shaft A (22).

5. An automatic mixing mechanism according to claim 4, characterized in that: The stirring blade A includes two spiral blades (23) symmetrically mounted on the stirring shaft A (22) and connected to each other, and several layers of Z-shaped blades (24) arranged vertically at equal distances on the stirring shaft A (22) and located inside the two spiral blades (23). Each layer of Z-shaped blades (24) is arranged in a ring at equal distances on the outer side of the stirring shaft A (22).

6. An automatic mixing mechanism according to claim 4, characterized in that: The storage rack (14) is equipped with a protective ladder (8) to assist maintenance personnel in climbing to the top of the storage tank (1).

7. An automatic mixing mechanism according to claim 1, characterized in that: The mixing tank (6) is embedded in the stepped support (9), and the metering pump (5) on the delivery pipe (4) is also installed on the stepped support (9).

8. An automatic mixing mechanism according to claim 1, characterized in that: The mixing tank (6) mixes the materials evenly by means of an agitator installed on it. The agitator includes an agitator motor B (10) installed on the top of the mixing tank (6), an agitator shaft B (11) extending into the mixing tank (6) and fixedly connected to the end of the output shaft of the agitator motor B (10), and agitator blades B provided on the agitator shaft B (11).

9. An automatic mixing mechanism according to claim 8, characterized in that: The stirring blade B includes a mixing disk (12) fixed to the bottom of the stirring shaft B (11) and mixing blades (13) arranged in a ring at equal distances at the upper and lower ends of the mixing disk (12) and staggered.

10. An automatic mixing mechanism according to claim 1, characterized in that: The control system adopts a PLC programmable logic controller. The operator inputs the mixing ratio and total mixing amount of the curing agent and paint through the touch screen on the PLC programmable logic controller. The PLC programmable logic controller controls the opening, closing and flow rate of the metering pump (5) according to the set parameters, and monitors the data of the flow sensor in real time for feedback adjustment.

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