A film coating premix blending apparatus

Abstract

The present disclosure relates to a film coating premix mixing device, comprising a mixing tank and a stirring frame arranged in the mixing tank, the mixing tank and the stirring frame are connected through a connecting frame, a stirring shaft and connecting rods on both sides of the stirring frame are arranged on the stirring frame, a plurality of scrapers connected through pins and the same number of stirring blades as the scrapers are arranged on the connecting rods, a first motor is arranged at the bottom of the mixing tank, a second motor is arranged at the bottom, and three layers of stirring paddles are arranged on the stirring shaft from top to bottom, through the synergistic effect of the layered stirring structure and the scrapers and stirring blades on the connecting rods, the mixing of the material in the mixing tank is realized, the residual material is scraped off by the scrapers adhering to the tank wall when the connecting rods rotate, combined with the secondary refinement transmission of the second motor at the bottom, the problems of material stratification and tank wall adhesion existing in traditional mixing equipment are solved, and the mixing uniformity is further improved through the independent driving of the double motors of the first motor and the second motor.

Description

Technical Field

[0001] This disclosure relates to the field of mixing equipment technology, and specifically to a film coating premix mixing equipment. Background Technology

[0002] The statements herein provide only background information in relation to this disclosure and do not necessarily constitute prior art.

[0003] Film-coated premixes are a type of pharmaceutical premixed excipient. They do not play a role in the efficacy of the drug but serve as an auxiliary material to coat the outer surface of powders, granules, pills, or tablets with a stable polymer film. Compared with traditional sugar coating, film coating technology has the advantages of shorter production cycle and less material usage. Film coating requires a mixer to stir and mix the materials before coating. To ensure the uniformity of the film-coated premix, high-speed stirring is usually used, and the stirring time is extended. The high heat generated during the stirring process can easily affect the quality of the mixture.

[0004] In actual use, most mixing equipment uses agitator blades to mix materials. After a certain period of use, the inner wall of the mixer is difficult to clean due to the fixed agitation structure, which easily leads to material adhesion, resulting in uneven mixing and a large amount of material adhering to it. This material is difficult to clean, and cleaning often requires stopping the machine. This results in the material adhering to the inner wall of the mixer for too long, and the material cannot be reused after cleaning, thus causing a certain amount of waste. Utility Model Content

[0005] The purpose of this disclosure is to provide a film coating premix mixing device that can at least solve one of the above-mentioned technical problems.

[0006] To achieve the above objectives, one or more embodiments of this disclosure provide a film coating premix mixing device, including a mixing tank and a stirring rack disposed inside the mixing tank. The mixing tank and the stirring rack are connected by a connecting frame. The stirring rack is provided with a first connecting hole and a second connecting hole for fixing a stirring shaft, as well as connecting rods on both sides of the stirring rack. The stirring shaft is rotatably connected to the first connecting hole and the second connecting hole.

[0007] Furthermore, the stirring shaft is provided with an upper stirring blade, a middle stirring blade, and a lower stirring blade from top to bottom. The middle and lower stirring blades are located near the second connecting hole, and the upper stirring blade is located near the first connecting hole.

[0008] Furthermore, the connecting rod is bent in a "C" shape, with the opening of the connecting rod facing the stirring shaft, and multiple scrapers connected by pins are provided on the connecting rod.

[0009] Furthermore, the connecting rod is also provided with the same number of stirring blades as the scraper, and the stirring blades are fixedly connected to the connecting rod.

[0010] Furthermore, the second connection hole is connected to the connecting rod of the stirring frame through an "L"-shaped connector, and the lower stirring paddle is located in the space area formed by the two "L"-shaped connectors.

[0011] Furthermore, the connecting frame is disposed on the top of the mixing tank, and a motor base for fixing the first motor is disposed on the connecting frame. The main shaft of the first motor is connected to the stirring shaft through a hollow shaft. The main shaft and the stirring shaft are connected by a coupling.

[0012] Furthermore, the hollow shaft has a keyway inside for fixing the motor spindle, and a keyway outside the hollow shaft for fixing the stirring frame.

[0013] Furthermore, the bottom of the mixing tank is provided with a homogenizing shaft for material homogenization transmission, and the homogenizing shaft is connected to the main shaft of the second motor.

[0014] Furthermore, a motor frame is provided between the second motor and the mixing tank.

[0015] Furthermore, the mixing tank has multiple vents on its circumferential outer wall for pressure relief.

[0016] The beneficial effects of one or more of the above technical solutions are as follows:

[0017] This disclosure achieves material mixing within a mixing tank through the synergistic action of a layered stirring structure (upper, middle, and lower stirring paddles) and the scraper and stirring blades on a "C"-shaped connecting rod. The upper stirring paddle rapidly disperses the material near the inlet, while the middle and lower stirring paddles form a high-intensity shear flow within the confined space of the "L"-shaped connector, effectively preventing agglomeration. The scraper, rotating with the connecting rod, adheres to the tank wall to remove residual material. Combined with the secondary refining drive of the bottom homogenizing shaft, this solves the problems of material stratification and tank wall adhesion inherent in traditional mixing equipment. The synergistic effect of dual-motor independent drives further improves mixing uniformity, and the venting port prevents material deterioration due to pressure buildup within the tank, significantly ensuring the product stability and consistency of the film-coated premix. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0019] Figure 1 This is a three-dimensional schematic diagram of the overall structure in one or more embodiments of this disclosure;

[0020] Figure 2This is a bottom view of the mixing tank in one or more embodiments of this disclosure;

[0021] Figure 3 This is a perspective view of the stirring rack in one or more embodiments of this disclosure;

[0022] Figure 4 This is a schematic diagram showing the connection between the second motor and the homogeneous shaft in one or more embodiments of this disclosure;

[0023] Figure 5 This is a rear view schematic diagram of the overall structure in one or more embodiments of this disclosure;

[0024] Figure 6 For one or more embodiments of this disclosure Figure 5 Enlarged view of a portion at point A;

[0025] Figure 7 For one or more embodiments of this disclosure Figure 5 A magnified view of section B.

[0026] In the diagram, 1. Mixing tank; 2. Connecting frame; 3. First motor; 4. Second motor; 5. Exhaust port; 6. Main shaft; 7. Hollow shaft; 8. Connecting rod; 9. Upper agitator; 10. Middle agitator; 11. Lower agitator; 12. Scraper; 13. Agitator blade; 14. Connecting piece; 15. Coupling; 16. First connecting hole; 17. Second connecting hole; 18. Rotor; 19. Stator; 20. Homogenizing shaft; 21. Motor frame; 22. Shaft hole; 23. Discharge port. Detailed Implementation

[0027] like Figures 1-7 As shown, this embodiment provides a film coating premix mixing device, including a mixing tank 1 and a stirring rack disposed in the mixing tank 1. The mixing tank 1 and the stirring rack are connected by a connecting frame 2. The stirring rack is provided with a first connecting hole 16 and a second connecting hole 17 for fixing the stirring shaft, as well as connecting rods 8 on both sides of the stirring rack. The stirring shaft is rotatably connected to the first connecting hole 16 and the second connecting hole 17.

[0028] like Figure 1 and Figure 2 As shown, the connecting frame 2 is set on the top of the mixing tank 1. A motor base for fixing the first motor 3 is set on the connecting frame 2. Multiple vent ports 5 for pressure relief are set on the circumferential outer wall of the mixing tank 1. A filter screen is also set at the position where the vent port 5 is connected to the mixing tank to prevent clogging, thereby ensuring that the vent port 5 can release the overpressure that may be generated in the tank in time during the mixing process, thereby protecting the safety of the equipment and operators.

[0029] like Figure 3As shown, the stirring shaft is provided with an upper stirring blade 9, a middle stirring blade 10, and a lower stirring blade 11 from top to bottom. The middle stirring blade 10 and the lower stirring blade 11 are located near the second connecting hole 17, and the upper stirring blade 9 is located near the first connecting hole 16. The main shaft 6 of the first motor 3 is connected to the stirring shaft through a hollow shaft 7. The main shaft 6 and the stirring shaft are connected by a coupling 15.

[0030] Specifically, the upper agitator 9 can effectively approach the feed inlet, thereby quickly dispersing the incoming material and ensuring that the material can be rapidly and uniformly mixed after entering the mixing system; the middle agitator 10 and the lower agitator 11 work together within the space defined by the "L"-shaped connector 14 to generate a high-intensity shear flow. The shear flow prevents the material from agglomerating during the mixing process, ensuring high efficiency of the mixing process and stable material quality.

[0031] The hollow shaft 7 has a keyway inside for fixing the motor spindle 6, ensuring a tight connection between the motor spindle 6 and the hollow shaft 7, thereby improving the overall transmission stability and efficiency. Furthermore, the hollow shaft 7 has a keyway on its outer side for fixing the stirring frame, ensuring a tight fit between the stirring frame and the hollow shaft 7. This allows the stirring frame to remain stable during operation, preventing displacement or shaking, thus guaranteeing the uniformity and efficiency of the stirring process.

[0032] like Figure 2 and Figure 4 As shown, the bottom of the mixing tank 1 is provided with a homogenizing shaft 20 for material homogenization transmission, as well as a shaft hole 22 for mounting the homogenizing shaft 20 and a discharge port 23. The homogenizing shaft 20 is connected to the main shaft 6 of the second motor 4. A motor frame 21 is provided between the second motor 4 and the mixing tank 1. The synergy of the independent drive of the two motors further improves the mixing uniformity.

[0033] Specifically, such as Figure 5 and Figure 7 As shown, a homogenizing shaft 20 for material homogenization transmission is provided at the bottom of the mixing tank 1. The homogenizing shaft 20 is connected to the main shaft 6 of the second motor 4, ensuring efficient and stable transmission. A rotor 18 and a stator 19 are provided at the connection between the homogenizing shaft 20 and the mixing tank 1. The rotor 18 and the stator 19 are fixed on the motor frame 21 of the second motor 4, which is located below the bottom of the mixing tank 1.

[0034] By using the dual-motor independent drive of the second motor 4 and the first motor 3, precise control of the mixing process is achieved. This collaborative working mode significantly improves the mixing uniformity and ensures the quality and consistency of the final mixture.

[0035] like Figure 3As shown, the connecting rod 8 is bent in a "C" shape, with its opening facing the stirring shaft. Multiple scrapers 12 connected by pins are mounted on the connecting rod 8. The scrapers 12 are fixed by the pins, allowing them to contact the tank wall without affecting the stirring. The connecting rod 8 also has the same number of stirring blades 13 as the scrapers 12. The stirring blades 13 are fixed to the inside of the connecting rod 8, distributed at a 90° phase difference with the scrapers 12 to avoid motion interference. The second connecting hole 17 is connected to the connecting rod 8 of the stirring frame via an "L"-shaped connector 14. The lower stirring paddle 11 is located within the space formed by the two "L"-shaped connectors 14.

[0036] Specifically, such as Figure 5 and Figure 6 As shown, the bottom of the mixing tank 1 is set in a frustum shape. The scraper 12 is installed on the outside of the connecting rod 8 (near the tank wall) by a pin shaft, and is inclined at a radial angle of 15° to 30° with the stirring shaft to ensure that the leading edge of the scraper contacts the tank wall of the mixing tank 1 first when the scraper rotates. Each connecting rod 8 is provided with 4 scrapers 12 distributed at equal intervals along the length of the rod from top to bottom. The scraper 12 contacts the tank wall of the mixing tank 1 and is inclined at a certain angle to scrape. At the same time, the installation of the scraper 12 avoids the top feed port and the bottom discharge port. When the scraper 12 moves with the rotation of the connecting rod 8, the scraper 12 will closely fit the inner tank wall of the mixing tank 1 to scrape off the residual material. Combined with the secondary refining transmission of the bottom homogenizing shaft 20, the residual material in the tank is effectively scraped off.

[0037] The working principle of this utility model:

[0038] During use, the material is fed into the top of the mixing tank 1. The first motor 3 drives the stirring shaft to rotate. The upper stirring blade 9 on the stirring shaft disperses the material radially, while the middle and lower stirring blades 11 form a vortex shear. The connecting rod 8 rotates with the stirring shaft, and the scraper 12 scrapes off the residue by adhering to the tank wall under the action of centrifugal force. The stirring blade 13 pushes the material to converge towards the center of the tank. The second motor 4 drives the homogenizing shaft 20 to rotate, and the exhaust port 5 discharges hot and humid air in real time. After mixing is completed, the machine is stopped and the bottom valve is opened, and the residual material is scraped out by the scraper 12.

[0039] While the specific embodiments of this disclosure have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this disclosure. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this disclosure are still within the scope of protection of this disclosure.

Claims

1. A film coating premixing equipment, characterized in that, The system includes a mixing tank and a stirring rack disposed inside the mixing tank. The mixing tank and the stirring rack are connected by a connecting frame. The stirring rack is provided with a first connecting hole and a second connecting hole for fixing a stirring shaft, as well as connecting rods on both sides of the stirring rack. The stirring shaft is rotatably connected to the first connecting hole and the second connecting hole. The stirring shaft is provided with an upper stirring blade, a middle stirring blade, and a lower stirring blade from top to bottom. The middle and lower stirring blades are located near the second connecting hole, and the upper stirring blade is located near the first connecting hole. The connecting rod is bent in a "C" shape, with the opening of the connecting rod facing the stirring shaft. The connecting rod is equipped with multiple scrapers connected by pins.

2. The film coating premix mixing equipment according to claim 1, characterized in that, The connecting rod is also provided with the same number of stirring blades as the scraper, and the stirring blades are fixedly connected to the connecting rod.

3. The film coating premix mixing equipment according to claim 1, characterized in that, The second connection hole is connected to the connecting rod of the stirring frame through an "L"-shaped connector, and the lower stirring paddle is located in the space area formed by the two "L"-shaped connectors.

4. The film coating premix mixing equipment according to claim 1, characterized in that, The connecting frame is set on the top of the mixing tank, and a motor base for fixing the first motor is set on the connecting frame. The main shaft of the first motor is connected to the stirring shaft through a hollow shaft. The main shaft and the stirring shaft are connected by a coupling.

5. The film coating premix mixing equipment according to claim 4, characterized in that, The hollow shaft has a keyway inside for fixing the motor spindle, and a keyway on the outside of the hollow shaft for fixing the stirring rack.

6. The film coating premix mixing equipment according to claim 1, characterized in that, The bottom of the mixing tank is provided with a homogenizing shaft for material homogenization and transmission, and the homogenizing shaft is connected to the main shaft of the second motor.

7. The film coating premix mixing equipment according to claim 6, characterized in that, A motor frame is provided between the second motor and the mixing tank.

8. The film coating premix mixing equipment according to claim 1, characterized in that, The mixing tank has multiple vents on its circumferential outer wall for pressure relief.

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