Polyvinyl alcohol aqueous solution stirring paddle

Abstract

The utility model discloses a polyvinyl alcohol aqueous solution stirring paddle. The stirring paddle comprises a main shaft, a top paddle blade, a bottom paddle blade and a helical ribbon type stirring paddle blade, the top blades and the bottom blades are sequentially arranged in the length direction of the main shaft and are arranged at intervals. The helical ribbon type stirring blade is located between the top blade and the bottom blade, spirally extends in the length direction and the circumferential direction of the main shaft, and is connected to the main shaft. A plurality of through holes are formed in the helical ribbon type stirring blades, in the stirring process, attachment of materials to the helical ribbon type stirring blades can be reduced, flowing of the materials is facilitated, the mixing uniformity of the materials is improved, the stirring device is suitable for stirring a polyvinyl alcohol aqueous solution at high viscosity and high rotating speed, the materials can be fully mixed, and in the stirring process, the stirring efficiency is improved. The through holes can cut and eliminate bubbles in the materials, so that the problems of bubbles generated due to overhigh viscosity of the materials during stirring, adhesion of materials at the bottom of the kettle and poor overall mixing effect are solved, and the production efficiency of enterprises is improved.

Description

Technical Field

[0001] This utility model relates to the field of agitator technology, and in particular to an agitator for polyvinyl alcohol aqueous solution. Background Technology

[0002] Polyvinyl alcohol (PVA) is a widely used water-soluble polymer material. It can be used as a raw material to produce new materials such as PVA films, PVA fibers, and PVB resins. The preparation of these products involves dissolving PVA resin in water to form a PVA solution. In the production of water-based adhesive VAE emulsions, aqueous PVA solutions are often added for colloidal protection, necessitating the industrial production of PVA solutions.

[0003] In the industrial production of polyvinyl alcohol (PVA) aqueous solutions, uneven material mixing is a frequent problem. During the stirring process, materials tend to adhere to the stirring paddle, and the upper layer of fluid flows relatively slowly, leading to uneven mixing, unsatisfactory mixing effect, and ultimately a high rate of non-compliance in the solid content of the PVA aqueous solution.

[0004] Furthermore, due to the current requirements for certain special product specifications, the concentration of polyvinyl alcohol (PVA) solutions prepared must be above 20%, with a viscosity as high as 5000-150000 CPS, and the degree of polymerization of the selected PVA resin must be above 2600. With ordinary stirring paddles, as the rotation speed increases during use, a large number of large-volume air bubbles are introduced into the solution. These bubbles are difficult to eliminate during stirring, significantly affecting the viscosity test results of the product, ultimately impacting product quality and performance. Utility Model Content

[0005] To solve one of the above-mentioned technical problems, this utility model provides a stirring paddle for polyvinyl alcohol aqueous solution.

[0006] The present invention adopts the following technical solution:

[0007] A stirring paddle for polyvinyl alcohol aqueous solution, comprising:

[0008] spindle;

[0009] The top blade and the bottom blade are arranged sequentially along the length of the main shaft, and the top blade and the bottom blade are arranged at intervals.

[0010] A ribbon-type stirring blade is located between the top blade and the bottom blade. The ribbon-type stirring blade extends spirally along the length and circumferential direction of the main shaft and is connected to the main shaft.

[0011] The spiral-shaped stirring blade is provided with multiple through holes.

[0012] Optionally, each of the through holes is distributed along the length and width directions of the ribbon-type stirring blade.

[0013] Optionally, the diameter of the through hole is 1000um to 4000um.

[0014] Optionally, the middle of both the top blade and the bottom blade is connected to the main shaft, and both sides of the top blade and the bottom blade extend out of the main shaft;

[0015] The middle part of the top blade protrudes outward from the side opposite to the bottom blade, and the middle part of the bottom blade protrudes outward from the side opposite to the top blade.

[0016] Optionally, the main shaft, the top blade, and the bottom blade are located in the same plane.

[0017] Optionally, a through groove is provided on the main shaft;

[0018] The top blade is disposed through the through slot;

[0019] Furthermore, the top blade is fixedly connected to the main shaft.

[0020] Optionally, the top blade comprises two half blades;

[0021] The two half-blades are respectively disposed on both sides of the main shaft, and each half-blade is fixed to the main shaft at one end.

[0022] Optionally, a slit is provided at the end of the spindle;

[0023] The bottom blade passes through the slit and is fixedly connected to the main shaft.

[0024] Optionally, the polyvinyl alcohol aqueous solution stirring paddle includes a plurality of connecting shafts, each of which is arranged sequentially at intervals along the length direction of the main shaft, and each of which is perpendicularly connected to the main shaft;

[0025] The ends of each of the connecting shafts are connected to the ribbon-type stirring blades.

[0026] Optionally, the two ends of the connecting shaft at the top are respectively connected to the two ends of the top blade;

[0027] The two ends of the connecting shaft located at the bottom are respectively connected to the two ends of the bottom blade.

[0028] By adopting the above technical solution, this application has the following beneficial effects:

[0029] The polyvinyl alcohol aqueous solution mixing impeller provided in this application has impellers at the top, middle, and bottom. The material is transported downwards by the ribbon-type impeller blades, with the bottom blades mixing and then circulating back to the top blades. The top blades then convey the material to the ribbon-type impeller blades, which continue to transport it downwards, creating a continuous cycle of mixing. This three-blade mixing system ensures thorough mixing of the material, resulting in more uniform dispersion of the polyvinyl alcohol and resolving the problem of uneven mixing. Furthermore, the through-holes on the ribbon-type impeller blades reduce material adhesion, improve liquid flow during mixing, and further enhance the uniformity of the mixture.

[0030] Furthermore, the ribbon-type agitator blades feature multiple rows of micro-through holes along their extension direction. This reduces material adhesion to the blades, promoting material flow and improving mixing uniformity. It is suitable for mixing polyvinyl alcohol aqueous solutions at high viscosity and high speeds, ensuring thorough mixing. During mixing, the through holes cut and eliminate air bubbles within the material, resolving issues such as air bubbles caused by high viscosity, material adhesion to the bottom of the vessel, and poor overall mixing, thus improving production efficiency.

[0031] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0033] Figure 1 This is a schematic diagram of the structure of the stirring paddle for the polyvinyl alcohol aqueous solution provided in the embodiments of this application;

[0034] Figure 2 This is a schematic diagram of the main structure of the stirring paddle for polyvinyl alcohol aqueous solution provided in the embodiments of this application;

[0035] Figure 3 This is a bottom view of the stirring paddle for the polyvinyl alcohol aqueous solution provided in the embodiments of this application.

[0036] In the diagram: 1. Main shaft; 2. Top impeller; 3. Ribbon-type stirring impeller; 4. Connecting shaft; 5. Bottom impeller; 6. Through hole.

[0037] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0039] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] See Figures 1 to 3 As shown in the illustration, this application provides a polyvinyl alcohol aqueous solution stirring impeller, including a main shaft 1, a top impeller 2, a bottom impeller 5, and a ribbon-type stirring impeller 3. The top impeller 2 and the bottom impeller are arranged sequentially along the length direction of the main shaft 1, and the top impeller 2 and the bottom impeller 5 are spaced apart. The ribbon-type stirring impeller 3 is located between the top impeller 2 and the bottom impeller 5, and extends spirally along the length and circumferential direction of the main shaft 1, and is connected to the main shaft 1. The ribbon-type stirring impeller 3 has multiple through holes 6.

[0042] The polyvinyl alcohol aqueous solution mixing impeller provided in this application has impellers at the top, middle, and bottom. The material is stirred and transported downwards by the ribbon impeller 3, mixed by the bottom impeller 5, and then circulated back to the top impeller 2. The top impeller 2 conveys the material to the ribbon impeller 3, which continues to transport it downwards, creating a continuous cycle of stirring. This three-impeller mixing design ensures thorough mixing of the material, resulting in more uniform dispersion of the polyvinyl alcohol and solving the problem of uneven mixing. Furthermore, the through holes 6 on the ribbon impeller 3 reduce the adhesion of the material to the impeller 3, improve the flow of the liquid during stirring, and further enhance the mixing uniformity.

[0043] Furthermore, the ribbon-type stirring blades 3 are equipped with multiple rows of micro-through holes 6 along their extension direction. During stirring, this reduces the adhesion of materials to the ribbon-type stirring blades, facilitating material flow and improving the uniformity of material mixing. This design is suitable for stirring polyvinyl alcohol aqueous solutions at high viscosity and high speeds, ensuring thorough mixing. During stirring, the through holes cut and eliminate air bubbles within the material. The numerous through holes break down large bubbles into smaller ones, reducing their volume and facilitating their removal from the reaction system from bottom to top. This ensures consistent product viscosity, resulting in better final product quality and performance. It solves the problems of air bubbles, material adhesion to the bottom of the vessel, and poor overall mixing caused by excessively high viscosity during stirring, thus improving enterprise production efficiency.

[0044] In some possible implementations, the through holes 6 are distributed along the length and width directions of the ribbon-type agitator blade 3. By providing through holes 6 in both the length and width directions of the ribbon-type agitator blade 3, the number and density of the through holes 6 are increased. This ensures that materials are less likely to adhere to any part of the ribbon-type agitator blade 3, and significantly increases the probability that the through holes 6 can cut through air bubbles, which is beneficial for breaking large air bubbles in the material into smaller ones, making it easier for the bubbles to escape from the material system.

[0045] In some possible implementations, the diameter of the through hole 6 is 1000µm to 4000µm. Extensive experiments have shown that a diameter of 1000µm to 4000µm for the through hole 6 is most effective at cutting larger air bubbles and breaking them up.

[0046] In some possible implementations, the top blade 2 and the bottom blade 5 are both connected to the main shaft 1 at their middle portions. Both the top blade 2 and the bottom blade 5 extend beyond the main shaft 1 on both sides, increasing the contact area with the material and thus increasing the mixing area, thereby improving the mixing uniformity. The top blade 2 protrudes outward from the side opposite to the bottom blade 5, forming an arched shape with both sides curving downwards. This facilitates the conveying of material to one side of the ribbon-type mixing blade, improving the efficiency of conveying the top slurry onto the ribbon-type mixing blade 3. The bottom blade 5 protrudes outward from the side opposite to the top blade 2, which helps to uniformly mix the lower slurry and guides the slurry to flow towards the container wall, and then upwards from the wall.

[0047] In some possible implementations, the main shaft 1, the top blade 2, and the bottom blade 5 are located on the same plane. Having the top blade 2 and bottom blade 5 on the same plane simplifies the structure and facilitates the placement of the central ribbon-type mixing blade 3. The top blade 2 and bottom blade 5 are symmetrical vertically, ensuring that the upper and lower blades are at the same angle during slurry mixing, resulting in good consistency and promoting uniform mixing and dispersion of the material.

[0048] In some possible implementations, a through-slot can be provided on the main shaft 1, through which the top blade 2 passes, and the top blade 2 is fixedly connected to the main shaft 1. After passing through the through-slot on the main shaft 1, the top blade 2 can be fixed to the main shaft 1 by welding. This configuration of the top blade 2 as a single unit, coupled with the rotational force applied by the main shaft 1, enhances the overall strength of the top blade 2 and the stability of its connection with the main shaft 1. Furthermore, welding ensures the stability of the top blade 2's position relative to the main shaft 1, thereby guaranteeing the effective drainage of the slurry by the top blade 2.

[0049] In some possible implementations, the top blade 2 comprises two half-blades, which are respectively disposed on both sides of the main shaft 1, and each half-blade is fixed to the main shaft 1 at one end. Both half-blades can be connected to the main shaft 1 by welding. This arrangement, compared to a single integrated top blade 2, reduces the overall strength of the top blade 2 and the connection strength between the top blade 2 and the main shaft 1. However, since the main shaft 1 is not slotted, its structural strength is increased, and it is less prone to bending. Therefore, the connection method between the main shaft 1 and the top blade 2 can be selected according to actual needs and usage scenarios.

[0050] In some possible implementations, a slit is provided at the end of the main shaft 1, and the slit may pass through the center of the circular end face of the main shaft end. The bottom impeller 5 passes through the slit and is fixedly connected to the main shaft 1. The bottom impeller 5 can be partially inserted into the slit along its width direction and partially exposed outside the slit. The bottom impeller 5 can be welded to the main shaft 1 or connected by fasteners. The bottom impeller 5 is a single integral component with high overall structural strength. The main shaft 1 applies force to rotate the bottom impeller 5 through the slit, which can ensure the overall strength of the bottom impeller 5 and the stability of the connection with the main shaft 1. Furthermore, the main shaft and the bottom impeller 5 are connected and fixed by welding, which significantly enhances the assembly structural strength of the bottom impeller 5. The bottom impeller 5 will not easily fall off or break, resulting in high reliability and a long service life for the polyvinyl alcohol aqueous solution stirring impeller.

[0051] In some possible embodiments, the polyvinyl alcohol aqueous solution agitator includes a plurality of connecting shafts 4, each of which is arranged sequentially at intervals along the length of the main shaft 1, and each of the connecting shafts 4 is perpendicularly connected to the main shaft 1. The end of each connecting shaft 4 is connected to the ribbon-type agitator blade 3. The connecting shafts 4 provide support for the ribbon-type agitator blade 3, improving the shape retention performance of the ribbon-type agitator blade 3 and extending its service life and maintenance cycle.

[0052] In some possible implementations, the two ends of the connecting shaft 4 at the top are respectively connected to the two ends of the top blade 2, and the two ends of the connecting shaft 4 at the bottom are respectively connected to the two ends of the bottom blade 5. The connecting shaft 4 is supported between the two ends of the top blade 2 and the two ends of the bottom blade 5 and the main shaft 1, forming a triangular stable structure, thereby providing stable support for the top blade 2 and the bottom blade 5, improving the shape retention performance of the top blade 2 and the bottom blade 5, and resulting in a long service life and good durability for the top blade 2 and the bottom blade 5.

[0053] In some possible implementations, the polyvinyl alcohol aqueous solution agitator may include two ribbon agitator blades 3, which are arranged sequentially and spaced apart along the circumference of the main shaft 1. The two ribbon agitator blades 3 can increase the contact area with the material, thereby improving the material transfer and agitation efficiency. The arrangement of the two ribbon agitator blades 3 increases the number of through holes 6, which can quickly cut and break up a large number of bubbles in the solution, thereby reducing the volume of the bubbles and facilitating the discharge of bubbles from the bottom to the top of the material reaction system. This ensures the viscosity of the product and improves the product quality.

[0054] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A polyvinyl alcohol aqueous solution stirring blade characterized by, The utility model relates to a stirring device for mixing material, which comprises: a main shaft; a top paddle and a bottom paddle, which are arranged in sequence along the length direction of the main shaft, and are spaced apart; a screw stirring paddle, which is located between the top paddle and the bottom paddle, spirally extends along the length direction and the circumferential direction of the main shaft, is connected to the main shaft, and is provided with a plurality of through holes; the middle part of the top paddle and the bottom paddle is connected to the main shaft, and the two sides of the top paddle and the bottom paddle extend out of the main shaft, the middle part of the top paddle protrudes to the side away from the bottom paddle, the middle part of the bottom paddle protrudes to the side away from the top paddle, a through groove is arranged on the main shaft, the top paddle passes through the through groove, and the top paddle is fixedly connected to the main shaft; a cutting seam part is arranged at the end of the main shaft, the bottom paddle passes through the cutting seam part, and the bottom paddle is fixedly connected to the main shaft; the two ends of a connecting shaft at the top are respectively connected to the two ends of the top paddle, and the two ends of a connecting shaft at the bottom are respectively connected to the two ends of the bottom paddle.

2. The polyvinyl alcohol aqueous solution stirring paddle according to claim 1, wherein, The through holes are arranged along the length direction and the width direction of the screw stirring paddle.

3. The polyvinyl alcohol aqueous solution stirring paddle according to claim 1, wherein The diameter of the through holes is 1000 um-4000 um.

4. The polyvinyl alcohol aqueous solution stirring paddle according to claim 1, wherein The main shaft, the top paddle and the bottom paddle are located in the same plane.

5. The polyvinyl alcohol aqueous solution stirring paddle according to claim 1, wherein The utility model relates to a stirring device for mixing material, which comprises: a plurality of connecting shafts, which are arranged in sequence and are spaced apart along the length direction of the main shaft, and are all perpendicularly connected to the main shaft; the end of each connecting shaft is connected to the screw stirring paddle.

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