A stirrer for cross-linking cross-linking polymerization of povidone

Abstract

The utility model relates to polyvinyl production equipment technical field, concretely is a kind of stirrer for crosslinking polyvinyl crosslinking polymerization, it include: mixing tank, top tank cover and four circular feeding pipe.Centrally disposed in mixing tank is set up first stirrer shaft, second stirrer shaft and auxiliary stirrer shaft of positive and negative rotation, outside installation lift scraper ring.First stirrer shaft and second stirrer shaft outer ring are fixed with stirring rod, and auxiliary stirrer shaft is fixed with stirring blade.Tank cover is provided with driving assembly, and each stirrer shaft is rotated and scraper ring is lifted.The stirrer is dispersed material preliminarily through multi-tube feeding, avoids accumulation;Utilize positive and negative rotation stirrer shaft to cooperate bending stirring rod and realize multidirectional efficient mixing;Auxiliary stirring blade strengthens stirring process, and improves uniformity.Lift scraper ring moves along the inner wall of tank body, and scrapes adhered material, reduces waste and cleaning difficulty, improves product quality and production stability.

Description

Technical Field

[0001] This utility model relates to the technical field of polyvinyl chloride production equipment, specifically a stirrer for crosslinking polyvinyl chloride crosslinking polymerization. Background Technology

[0002] Crosslinked polyvinylpyrrolidone is an important pharmaceutical excipient, a water-insoluble synthetic crosslinked N-vinyl-2-pyrrolidone homopolymer. Its preparation typically requires a nitrogen-protected environment, using sodium hydroxide solution as an initiator to induce crosslinking polymerization of N-vinylpyrrolidone. During this reaction, the material undergoes a significant phase change; initially a liquid system, it gradually transforms into a solid powder, generating crude crosslinked homopolymer. Subsequent processes, including centrifugation, dehydration, spray drying, and grading, yield the finished crosslinked polyvinylpyrrolidone product that meets pharmaceutical requirements.

[0003] In existing technologies, a stirrer is typically used to mix and transfer the reactants during crosslinking polymerization. However, existing stirring devices used in povidone production generally suffer from a limited range of stirring structures and directions of action. Since the reactants are often added all at once, this often leads to uneven material dispersion and low mixing efficiency, failing to meet the requirement of the material gradually transforming into powder in the later stages of the reaction. Furthermore, some material tends to adhere to the inner wall of the stirring vessel during stirring, forming a stagnant layer, further affecting reaction uniformity and ultimately resulting in unstable quality of the crosslinked povidone product. Therefore, this invention proposes a stirrer for crosslinking povidone polymerization to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a stirrer for crosslinking polyvinylpyrrolidone crosslinking polymerization, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a stirrer for crosslinking polyvinyl alcohol crosslinking polymerization, comprising: a stirring tank, a tank cover fixedly connected to the top of the stirring tank, four feeding pipes fixedly connected to the upper surface of the tank cover, the four feeding pipes being arranged in a circular pattern, and a stirring assembly being provided inside the stirring tank; The stirring assembly includes a rotatable first stirring shaft, a second stirring shaft sleeved on the outer ring surface of the first stirring shaft and rotating in the opposite direction to the first stirring shaft, an auxiliary stirring shaft rotatably mounted on the outside of the first stirring shaft and the second stirring shaft, and a liftable scraper ring disposed on the outside of the first stirring shaft, the second stirring shaft and the auxiliary stirring shaft. Stirring rods are fixedly connected to the outer rings of the first and second stirring shafts, and stirring blades are fixedly connected to the auxiliary stirring shaft. A drive assembly is provided on the upper surface of the tank cover. The drive assembly is used to drive the first stirring shaft, the second stirring shaft and the auxiliary stirring shaft to rotate, and to drive the scraper ring to move up and down.

[0006] Preferably, a sealing plug is slidably inserted into the top of the feeding pipe, the bottom of the feeding pipe is connected to the top of the mixing tank, and a discharge pipe is fixedly connected to the bottom of the mixing tank.

[0007] Preferably, the upper surface of the mixing tank is fixedly connected to the support plate via a fixing column. The drive assembly includes a motor, which is fixedly mounted on one side of a fixed frame. The fixed frame is welded and fixed to the upper surface of the support plate. The output end of the motor passes through the fixed frame and is fixedly connected to a drive gear. Both the first and second mixing shafts are rotatably connected to the fixed frame. Preferably, a first gear is meshed on the upper side of the drive gear, and a second gear is meshed on the lower side of the drive gear. The first gear is fixedly sleeved on the top of the first stirring shaft, and the second gear is fixedly sleeved on the top of the second stirring shaft. The tops of the first stirring shaft, the second stirring shaft, and the auxiliary stirring shaft are all rotatably sleeved between the tank cover and the support plate.

[0008] Preferably, a large gear disc is provided between the tank cover and the support plate, and four small gear discs meshing around the large gear disc. The large gear disc is fixedly sleeved on the top side of the second stirring shaft, two of the small gear discs are fixedly connected to the top side of the auxiliary stirring shaft, and the other two small gear discs are fixedly connected to the threaded rod.

[0009] Preferably, the top end of the threaded rod is rotatably sleeved inside the support plate, the bottom end of the threaded rod passes through the tank cover and is rotatably connected to the bottom of the inner side of the mixing tank, the threaded rod is threadedly sleeved on one end of the connecting block, the other end of the connecting block is fixedly connected to the inner ring surface of the scraper ring, and the scraper ring is slidably connected to the inner wall of the mixing tank.

[0010] Compared with the prior art, the beneficial effects of this utility model are: Multiple feeding pipes are used to initially disperse and feed materials, avoiding local accumulation. A coaxial, reversible first and second stirring shaft, along with a bent stirring rod, is used to achieve multi-directional and efficient mixing of materials. At the same time, the auxiliary stirring shaft drives the stirring blades to further enhance the stirring process and improve the uniformity of the reaction. In addition, a liftable scraper ring moves along the inner wall of the tank to effectively scrape off adhering materials, avoiding residues and the formation of stagnant layers, reducing resource waste and cleaning difficulty, thereby improving the overall mixing quality and production stability of cross-linked polyvinyl acetate products. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a bottom view of the overall structure of this utility model; Figure 3 This is a top view of the internal structure of this utility model; Figure 4 This is a side view of the internal structure of this utility model.

[0012] In the diagram: 1. Mixing tank; 2. Tank lid; 3. Feeding pipe; 4. First stirring shaft; 5. Second stirring shaft; 6. Auxiliary stirring shaft; 7. Scraper ring; 8. Stirring rod; 9. Stirring blade; 10. Sealing plug; 11. Discharge pipe; 12. Fixed column; 13. Support plate; 14. Motor; 15. Fixing frame; 16. Drive gear; 17. First gear; 18. Second gear; 19. Large gear disc; 20. Small gear disc; 21. Threaded rod; 22. Connecting block. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0014] Please see Figures 1 to 4 This utility model provides a technical solution: a stirrer for crosslinking polyvinyl chloride (PVC) polymerization, comprising: a stirring tank 1, which serves as the main body of the entire device, providing fixed support and simultaneously holding and mixing the PVC raw material; a tank cover 2 fixedly connected to the top of the stirring tank 1, with four feeding pipes 3 fixedly connected to the upper surface of the tank cover 2, arranged in a circular pattern; and a stirring assembly installed inside the stirring tank 1. The four feeding pipes 3 facilitate the addition of materials to the stirring tank 1 from different locations, avoiding the accumulation of materials caused by adding them all at once from one place, thus improving the uniformity of subsequent mixing. The container includes a rotatable first stirring shaft 4, a second stirring shaft 5 sleeved on the outer surface of the first stirring shaft 4 and rotating in the opposite direction to the first stirring shaft 4, an auxiliary stirring shaft 6 rotatably mounted on the outside of the first stirring shaft 4 and the second stirring shaft 5, and a liftable scraper ring 7 disposed on the outside of the first stirring shaft 4, the second stirring shaft 5 and the auxiliary stirring shaft 6. Stirring rods 8 are fixedly connected to the outer surfaces of the first stirring shaft 4 and the second stirring shaft 5. The stirring rods 8 are bent. Stirring blades 9 are fixedly connected to the auxiliary stirring shaft 6. A drive assembly is provided on the upper surface of the container cover 2. The drive assembly is used to drive the first stirring shaft 4, the second stirring shaft 5 and the auxiliary stirring shaft 6 to rotate, and to drive the scraper ring 7 to move up and down.

[0015] In use, cross-linked polyvinyl acetate raw materials are added to the mixing tank 1 through four feeding pipes 3 to initially disperse the material and prevent it from accumulating in one place. Then, driven by the drive component, the first stirring shaft 4 and the second stirring shaft 5 are coaxially rotated in both directions, thereby driving the stirring rod 8 to stir the material, improving mixing efficiency and uniformity, effectively preventing material accumulation and improving dispersion. At the same time, the auxiliary stirring shaft 6 can also rotate, which in turn drives the stirring blade 9 to rotate, further improving the stirring effect and quality. In addition, the drive component drives the scraper ring 7 to reciprocate up and down along the inner wall of the mixing tank 1 to scrape off the residual or adhered material on the inner wall of the tank. This not only allows the residual material on the inner wall of the tank or in the equipment to be reused, avoiding resource waste caused by residue, and preventing the formation of a stagnant layer, but also improves the processing quality and effect of the material and avoids the trouble of subsequent cleaning.

[0016] A sealing plug 10 is slidably inserted into the top of the feeding pipe 3, so that it can be pulled out during feeding to facilitate the addition of materials. After feeding is completed, the feeding pipe 3 is blocked to prevent the entry of external impurities. The bottom of the feeding pipe 3 is connected to the top of the mixing tank 1. The bottom of the mixing tank 1 is fixedly connected to the discharge pipe 11. By operating the valve body on the discharge pipe 11, the material can be discharged.

[0017] The upper surface of the mixing tank 1 is fixedly connected to the support plate 13 via a fixing column 12. A controller is fixedly installed on the support plate 13. The drive assembly includes a motor 14, which is electrically connected to the controller, thereby controlling the forward and reverse rotation of the motor 14. The motor 14 is fixedly installed on one side of a fixing frame 15, which is welded and fixed to the upper surface of the support plate 13, providing fixed support for the motor 14. The output end of the motor 14 passes through the fixing frame 15 and is fixedly connected to the drive gear 16. The first stirring shaft 4 and the second stirring shaft 5 are both rotatably connected to the fixing frame 15. The frame 15 supports and limits the first stirring shaft 4 and the second stirring shaft 5. The upper side of the drive gear 16 is meshed with the first gear 17, and the lower side of the drive gear 16 is meshed with the second gear 18. The first gear 17 is fixedly sleeved on the top of the first stirring shaft 4, and the second gear 18 is fixedly sleeved on the top of the second stirring shaft 5. The tops of the first stirring shaft 4, the second stirring shaft 5, and the auxiliary stirring shaft 6 are all rotatably sleeved between the tank cover 2 and the support plate 13. The tank cover 2 and the support plate 13 further support the first stirring shaft 4, the second stirring shaft 5, and the auxiliary stirring shaft 6, further improving their stability during rotation.

[0018] A large gear disc 19 is provided between the tank cover 2 and the support plate 13, and four small gear discs 20 meshing around the large gear disc 19. The large gear disc 19 and the small gear discs 20 mesh and drive each other. The large gear disc 19 is fixedly sleeved on the top side of the second stirring shaft 5. Two of the small gear discs 20 are fixedly connected to the top side of the auxiliary stirring shaft 6, and the other two small gear discs 20 are fixedly connected to the threaded rod 21. The top end of the threaded rod 21 is rotatably sleeved in the support plate 13, and the bottom end of the threaded rod 21 passes through the tank cover 2 and is rotatably connected to the bottom of the inner side of the stirring tank 1. The threaded rod 21 is threadedly sleeved on one end of the connecting block 22, and the other end of the connecting block 22 is fixedly connected to the inner ring surface of the scraper ring 7. The scraper ring 7 is slidably connected to the inner wall of the stirring tank 1.

[0019] When the raw materials are added and stirring is required, the controller controls the motor 14 to intermittently rotate in both directions. The motor 14 drives the drive gear 16, which is fixedly connected to its output end, to rotate. The drive gear 16 meshes with the first gear 17 and the second gear 18, which rotate in opposite directions. The first gear 17 drives the first stirring shaft 4 to rotate, and the second gear 18 drives the second stirring shaft 5 to rotate. Simultaneously, the first stirring shaft 4 is rotated and fitted inside the second stirring shaft 5, thus forming a coaxial forward and reverse rotation between the first stirring shaft 4 and the second stirring shaft 5. The first stirring shaft 4 and the second stirring shaft 5 drive the several stirring rods 8 fixedly installed on them to rotate, thereby thoroughly and evenly stirring the raw materials. While the second stirring shaft 5 rotates, it drives the large gear disc 19 fixedly fitted on it to rotate, and the large gear disc 19 drives the small gear discs 20 meshing around it to rotate. Two of the small toothed discs 20 then drive the auxiliary stirring shaft 6, which is fixedly sleeved inside, to rotate. This causes the auxiliary stirring shaft 6 to drive the stirring blades 9 to rotate, further improving the stirring efficiency and effect. At the same time, it can also help to evenly disperse the material into the mixing tank 1 for mixing and stirring, reducing material sedimentation. The other two small toothed discs 20 drive the threaded rod 21 to rotate. The threaded rod 21 drives the connecting block 22 to move along its axial direction through the threaded engagement between the threaded rod and the connecting block 22. This drives the scraper ring 7 to move. The scraper ring 7 moves along the inner wall of the mixing tank 1. Since the motor 14 can rotate in both directions, it indirectly drives the threaded rod 21 to rotate in both directions, so that the scraper ring 7 can be raised and lowered, thereby scraping the material on the inner wall of the tank, avoiding material residue and adhesion, reducing the trouble of subsequent cleaning, reducing material waste, and improving the quality stability of cross-linked polyvinyl acetate products.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stirrer for crosslinking polyvinylpyrrolidone crosslinking polymerization, comprising a stirring tank (1), characterized in that: The top of the mixing tank (1) is fixedly connected to a tank cover (2), and four feeding pipes (3) are fixedly connected to the upper surface of the tank cover (2). The four feeding pipes (3) are arranged in a circle, and a mixing assembly is provided inside the mixing tank (1). The stirring assembly includes a rotatable first stirring shaft (4), a second stirring shaft (5) sleeved on the outer ring surface of the first stirring shaft (4) and rotating in the opposite direction to the first stirring shaft (4), an auxiliary stirring shaft (6) rotatably installed on the outside of the first stirring shaft (4) and the second stirring shaft (5), and a scraper ring (7) that can be raised and lowered and disposed on the outside of the first stirring shaft (4), the second stirring shaft (5) and the auxiliary stirring shaft (6). Stirring rods (8) are fixedly connected to the outer ring surfaces of the first stirring shaft (4) and the second stirring shaft (5). Stirring blades (9) are fixedly connected to the auxiliary stirring shaft (6). A drive assembly is provided on the upper surface of the tank cover (2). The drive assembly is used to drive the first stirring shaft (4), the second stirring shaft (5) and the auxiliary stirring shaft (6) to rotate, and to drive the scraper ring (7) to move up and down.

2. The stirrer for crosslinking polyvinylpyrrolidone crosslinking polymerization according to claim 1, characterized in that: The top of the feeding pipe (3) is slidably inserted with a sealing plug (10), the bottom of the feeding pipe (3) is connected to the top of the mixing tank (1), and the bottom of the mixing tank (1) is fixedly connected with a discharge pipe (11).

3. The stirrer for crosslinking polyvinylpyrrolidone crosslinking polymerization according to claim 2, characterized in that: The upper surface of the mixing tank (1) is fixedly connected to the support plate (13) by a fixed column (12). The drive assembly includes a motor (14), which is fixedly installed on one side of the fixed frame (15). The fixed frame (15) is welded and fixed to the upper surface of the support plate (13). The output end of the motor (14) passes through the fixed frame (15) and is fixedly connected to the drive gear (16). The first stirring shaft (4) and the second stirring shaft (5) are rotatably connected to the fixed frame (15).

4. The stirrer for crosslinking polyvinylpyrrolidone crosslinking polymerization according to claim 3, characterized in that: The drive gear (16) is meshed with a first gear (17) on its upper side and a second gear (18) on its lower side. The first gear (17) is fixedly sleeved on the top of the first stirring shaft (4) and the second gear (18) is fixedly sleeved on the top of the second stirring shaft (5). The tops of the first stirring shaft (4), the second stirring shaft (5) and the auxiliary stirring shaft (6) are all rotatably sleeved between the tank cover (2) and the support plate (13).

5. A stirrer for crosslinking polyvinylpyrrolidone crosslinking polymerization according to claim 4, characterized in that: A large gear disc (19) is provided between the can lid (2) and the support plate (13), and four small gear discs (20) meshing around the large gear disc (19). The large gear disc (19) is fixedly sleeved on the top side of the second stirring shaft (5). Two of the small gear discs (20) are fixedly connected to the top side of the auxiliary stirring shaft (6), and the other two small gear discs (20) are fixedly connected to the threaded rod (21).

6. A stirrer for crosslinking polyvinylpyrrolidone crosslinking polymerization according to claim 5, characterized in that: The top end of the threaded rod (21) is rotatably sleeved inside the support plate (13), the bottom end of the threaded rod (21) passes through the tank cover (2) and is rotatably connected to the bottom of the inner side of the mixing tank (1), the threaded rod (21) is threadedly sleeved on one end of the connecting block (22), the other end of the connecting block (22) is fixedly connected to the inner ring surface of the scraper ring (7), and the scraper ring (7) is slidably connected to the inner wall of the mixing tank (1).

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