PVA fiber pre-dispersion device

Abstract

The utility model relates to the technical field of building material pretreatment, and its purpose is to provide a kind of PVA fiber pre-dispersion device, including the dispersion bucket for containing dispersant solution, detachably installed with cover plate in the top of dispersion bucket, cover plate top is provided with motor, the output of motor is connected with stirring assembly after penetrating cover plate, and stirring assembly is dispersed stick, and dispersed stick is fixedly arranged in the bottom of dispersion bucket.The utility model is installed stirrer and dispersed stick in dispersion bucket, and short-cut fiber can be rotated in solution by stirring assembly, while dispersed stick around stirring assembly can be dispersed in the fiber of rotating solution, so that fiber can be evenly distributed in dispersant solution, effectively realize the operation of fiber pre-dispersion, and cooperate subsequent ultrasonic treatment process, can better solve the key problem of uneven fiber dispersion in current application process.

Description

Technical Field

[0001] This utility model relates to the field of building material pretreatment technology, and in particular to a PVA fiber predispersion device. Background Technology

[0002] In the performance modification of cement-based composites, adding glass fibers, steel fibers, basalt fibers, and polyvinyl alcohol (PVA) fibers is an effective way to improve their inherent defects such as low tensile strength, significant brittleness, and poor toughness. Among these fibers, PVA fibers, due to their unique physicochemical properties, easily form a highly efficient bridging effect in the cement matrix. This effect effectively transfers and disperses external loads through interfacial bonding between the fiber and the matrix, thereby significantly improving the mechanical properties, toughness, and impact resistance of the material. Therefore, PVA fibers are widely used in the modification of cement-based materials. However, PVA fibers are prone to agglomeration during actual addition, resulting in uneven fiber dispersion in the matrix. This problem has become a key bottleneck restricting further optimization of the performance of PVA fiber-modified cement-based materials, and urgently needs to be overcome through scientific and reasonable dispersion techniques.

[0003] The main causes of PVA fiber agglomeration are as follows: 1) Fiber clustering caused by surface hydrophilicity: PVA fibers have strong surface hydrophilicity and are prone to sticking together due to hydrogen bonding during stirring, especially in humid environments; 2) Restriction of fiber dispersion by stirring process: Traditional mechanical stirring is difficult to effectively separate fiber bundles, especially when the fiber content is high or the aspect ratio is large; 3) Fiber self-adsorption caused by electrostatic field: Fibers are prone to static electricity in dry environments, which leads to mutual adsorption and agglomeration.

[0004] In the process of modifying cementitious materials with PVA fibers, the uneven dispersion of PVA fibers in the cement matrix is ​​a problem caused by the hydrophilic association of the PVA fiber surface, the mixing process, and the effect of electrostatic fields. This not only affects the full utilization of the PVA fiber's performance but also limits its further application in modified cementitious materials. Utility Model Content

[0005] The purpose of this invention is to provide a PVA fiber pre-dispersion device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A PVA fiber pre-dispersion device includes a dispersion tank for holding a dispersant solution. A cover plate is detachably installed on the top of the dispersion tank. A motor is installed on the top of the cover plate. The output end of the motor passes through the cover plate and is connected to a stirring assembly. The stirring assembly has a dispersing rod, which is fixedly installed at the bottom of the dispersion tank.

[0008] The stirring assembly includes a stirring rod and stirring blades, with the stirring blades fixedly installed on the lower part of the stirring rod.

[0009] A triangular blade is provided on the side of the dispersing rod away from the rotation direction of the stirring assembly.

[0010] The dispersion rods are distributed in a single layer.

[0011] The dispersion rods are distributed in a concentric double layer.

[0012] The dispersion rods are arranged in a concentric double-layered staggered distribution.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0014] This invention installs a stirrer and a dispersing rod in a dispersion tank. The stirring assembly drives the chopped fibers to rotate in the solution, while the dispersing rods located around the stirring assembly disperse the fibers in the rotating solution, allowing the fibers to be evenly distributed in the dispersant solution. This effectively achieves the pre-dispersion of fibers. Combined with subsequent ultrasonic treatment, it can better solve the key problem of uneven fiber dispersion in current applications. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention.

[0016] Figure 2 This is a schematic diagram of the layout structure of the dispersing rod in Embodiment 1 of this utility model.

[0017] Figure 3 This is a schematic diagram of the layout structure of the dispersing rod in Embodiment 2 of this utility model.

[0018] Figure 4 This is a schematic diagram of the layout structure of the dispersing rod in Embodiment 3 of this utility model.

[0019] Figure 5 This is a schematic diagram of the layout structure of the dispersing rod in Embodiment 4 of this utility model.

[0020] Attached figures and their names: 1. Dispersion tank; 2. Cover plate; 3. Motor; 4. Dispersion rod; 5. Stirring assembly. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] Example 1

[0024] like Figure 1 As shown, the PVA fiber pre-dispersion device of this utility model includes a dispersion tank 1 for holding a dispersant solution. A cover plate 2 is detachably installed on the top of the dispersion tank 1. A motor 3 is bolted to the top of the cover plate 2. The output end of the motor 3 passes through the cover plate 2 and is connected to a stirring assembly 5. The stirring assembly 5 includes a stirring rod and stirring blades. The stirring blades are fixedly installed on the lower part of the stirring rod. Several dispersing rods 4 are evenly arranged around the stirring blades. The dispersing rods 4 are fixedly installed at the bottom of the dispersion tank 1.

[0025] like Figure 2 As shown, the dispersing rod 4 is a single layer. A triangular blade is provided on the side of the dispersing rod 4 away from the rotation direction of the stirring component 5. The dispersing rod 4 disperses the short-cut fibers during the stirring process through the blade, which can ensure the uniform distribution of fibers in the dispersant solution.

[0026] Example 2

[0027] like Figure 3 As shown, the difference from Example 1 is that in Example 2, the dispersion rod 4 is distributed in a concentric double layer.

[0028] Example 3

[0029] like Figure 4 As shown, based on the technology of Example 2, the number of dispersing rods 4 located in the inner ring is half the number of dispersing rods 4 located in the outer ring.

[0030] Example 4

[0031] like Figure 5 As shown, based on the technology of Embodiment 2, the dispersing rod 4 located in the inner ring is staggered with the dispersing rod 4 located in the outer ring.

[0032] Increasing the number of rings or layers of the dispersing rod 4 can significantly improve the dispersion effect.

Claims

1. A PVA fiber pre-dispersion device, characterized in that: The container includes a dispersion tank (1) for holding a dispersant solution. A cover plate (2) is detachably installed on the top of the dispersion tank (1). A motor (3) is installed on the top of the cover plate (2). The output end of the motor (3) passes through the cover plate (2) and is connected to a stirring assembly (5). Several dispersing rods (4) are evenly arranged around the stirring assembly (5). The dispersing rods (4) are fixedly installed at the bottom of the dispersion tank (1).

2. The PVA fiber pre-dispersion device according to claim 1, characterized in that: The stirring assembly (5) includes a stirring rod and stirring blades, with the stirring blades fixedly installed on the lower part of the stirring rod.

3. The PVA fiber pre-dispersion device according to claim 2, characterized in that: A triangular blade is provided on the side of the dispersing rod (4) away from the rotation direction of the stirring assembly (5).

4. The PVA fiber pre-dispersion device according to claim 3, characterized in that: The dispersion rod (4) is a single layer.

5. The PVA fiber pre-dispersion device according to claim 3, characterized in that: The dispersion rod (4) is a concentric double-layer distribution.

6. The PVA fiber pre-dispersion device according to claim 5, characterized in that: The dispersion rod (4) is a concentric double-layer staggered distribution.

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