Fiber dispersing device and fiber dispersing and pulping equipment

Abstract

The utility model belongs to the technical field of building materials, and particularly provides a fiber dispersing device which comprises a dispersing container and an air blower, the dispersing container is sequentially provided with a fiber collecting opening, a feeding opening and an air inlet from top to bottom; an air outlet of the air blower is connected with an air inlet of the dispersion container, and the air inlet direction is upward. The fiber dispersing device provided by the utility model is simple in structure and convenient to use, PVA fiber raw materials are dispersed through wind power before pulping, and the problems that PVA fibers are easy to agglomerate in water and are difficult to uniformly disperse in pulp can be effectively solved. On the basis, the utility model further provides fiber dispersing and pulping equipment, the prepared PVA fiber pulp is uniformly dispersed under the condition that a dispersing agent is not added, and uniform suspension liquid can be obtained again by slightly stirring after standing and precipitating. The method can be directly applied to current mainstream slurry flow method and beater-addition method steam-curing-free fiber cement board production lines, and operation of other production sections cannot be affected.

Description

Technical Field

[0001] The utility model belongs to the technical field of building materials, and specifically relates to a fiber dispersing device and fiber dispersing pulping equipment. Background Art

[0002] Autoclave-free fiber cement board is a new type of green building material product. The raw materials are mainly cement, solid waste and reinforcing fiber. In the production process, no autoclave, boiler and other thermal facilities are used, which greatly saves energy consumption and reduces air pollution. It is currently being vigorously promoted and developed.

[0003] The most commonly used reinforcing fibers in autoclaved fiber cement boards are PVA fibers and pulp fibers. The application of pulp fibers in fiber cement boards is very mature, while the application of PVA fibers is less. PVA fibers have excellent characteristics such as high strength and modulus, low elongation, acid and alkali resistance, solvent resistance, and resistance to sunlight and aging. At the same time, the fiber has a unique cross-sectional shape and good adhesion to cement. PVA fibers have been recognized by customers for their comprehensive performance advantages, high cost performance, and reasonable prices in the replacement of asbestos. However, the dispersion of PVA fiber pulping has always been a difficult problem. The PVA fibers that have just left the factory are wrapped and bonded together during packaging, storage, and transportation, and are squeezed during transportation to form dense fiber clusters. Because PVA fibers have good hydrophilicity, under the action of capillary tension, the denser fiber clusters meet water to form larger fiber bundles, which are more difficult to disperse. It is difficult to ensure that the fibers are evenly dispersed in the matrix to form a grid system during pulping. Utility Model Content

[0004] The utility model aims to overcome the problem that PVA fibers are easy to form dense fiber clusters and are difficult to be evenly dispersed in slurry.

[0005] To this end, the utility model provides a fiber dispersion device, including a dispersion container and a blower; the dispersion container is provided with a fiber collection port, a feed port and an air inlet from top to bottom; the air outlet of the blower is connected to the air inlet of the dispersion container, and the air inlet direction is upward.

[0006] Specifically, the feed port is provided with a screw feeder.

[0007] Specifically, a mesh screen is provided at the fiber collecting port.

[0008] Specifically, the mesh diameter of the above-mentioned sieve is 2.36 mm.

[0009] Specifically, a fiber collecting bag is provided at the fiber collecting opening.

[0010] Specifically, a discharge port is provided at the bottom of the dispersion container.

[0011] The utility model also provides a fiber dispersing pulping device, comprising the above-mentioned fiber dispersing device.

[0012] Specifically, the fiber dispersion pulping equipment further comprises a pulping device; the pulping device comprises a pulping container and a stirring assembly; the pulping container is in communication with the fiber collecting port of the dispersion container.

[0013] Specifically, the stirring assembly comprises a stirring shaft, a motor and a bracket; one end of the stirring shaft is provided with a plurality of stirring blades, and the other end is connected to the motor; the motor is mounted on the bracket.

[0014] Specifically, the above-mentioned bracket is a telescopic bracket.

[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0016] The fiber dispersing device provided by the utility model has a simple structure and is easy to use. It disperses the PVA fiber raw material by wind power before pulping, which can effectively solve the problem that PVA fiber is easy to agglomerate in water and difficult to be evenly dispersed in the pulp. The fiber dispersing pulping equipment can obtain a uniformly dispersed PVA fiber pulp without adding a dispersant, and a uniform suspension can be obtained again by slight stirring after static precipitation.

[0017] The fiber dispersion device and fiber dispersion pulping equipment provided by the utility model can be directly applied to the current mainstream slurry flow method and paper-taking method steam-free fiber cement board production line after being enlarged to industrial application, and will not affect the operation of other production sections.

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the fiber dispersing device provided by the utility model.

[0020] Figure 2 It is a schematic diagram of the fiber dispersion pulping equipment provided by the utility model.

[0021] Figure 3 It is a schematic diagram of a pulping device in the fiber dispersion pulping equipment provided by the utility model.

[0022] Figure 4 It is a schematic diagram of the structure of the stirring blades in the pulping device.

[0023] Explanation of the reference numerals: 1. dispersion container; 2. blower; 3. feed port; 4. screw feeder; 5. mesh screen; 6. fiber collecting port; 7. discharge port; 8. pulping container; 9. stirring blade; 10. stirring shaft; 11. motor; 12. bracket; 13. PVA fiber. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] Reference Figure 1 The utility model provides a fiber dispersion device, including a dispersion container 1 and a blower 2; the dispersion container 1 is provided with a fiber collection port 6, a feed port 3 and an air inlet from top to bottom; the air outlet of the blower 2 is connected to the air inlet of the dispersion container 1, and the air inlet direction is upward. When in use, the PVA fiber 13 is fed into the dispersion container 1 through the feed port 3, and the blower 2 is turned on synchronously to blow the PVA fiber 13 with the upward wind force. The wind speed can be adjusted according to the actual situation. It is preferred to first adjust the wind speed to a high wind speed (7-10m / s) for 2 minutes, then adjust it to a low wind speed (such as 2.5m / s) for 30 seconds, so that the PVA fiber 13 is slightly aggregated, and then adjust it to a high wind speed to continue blowing for 3 minutes, and finally collect the blown PVA fiber 13 at the upper fiber collection port 6. The PVA fiber 13 dry material is suspended and dispersed in the dispersion container 1 for at least 5.5 minutes after the high and low wind speeds are changed, so that the fiber is effectively dispersed and initially fluffy.

[0027] Furthermore, the feed port 3 is provided with a screw feeder 4 to prevent the fibers from overflowing.

[0028] In order to improve the dispersion of the fibers, a mesh screen 5 is provided at the fiber collection port 6. The mesh diameter of the mesh screen 5 is preferably 2.36 mm.

[0029] Furthermore, a fiber collection bag is provided at the fiber collection port 6 to collect the PVA fibers 13 while blowing. The fiber collection bag 6 is preferably a polyester needle felt fiber collection bag. The polyester needle felt material with a certain pore size makes the fiber collection bag 6 breathable. While collecting the fibers, the gas mixed with the fibers can be directly discharged without affecting the collection of the fibers.

[0030] Specifically, a discharge port 7 is provided at the bottom of the dispersion container 1 ; the air inlet is located above the discharge port 7 , so as to facilitate the removal of the PVA fibers 13 clogged at the bottom of the dispersion container 1 .

[0031] Reference Figure 2 The utility model also provides a fiber dispersing pulping device, including the above-mentioned fiber dispersing device and pulping device. Figure 3 As shown, the pulping device includes a pulping container 8 and a stirring component; the feed port of the pulping container 8 is connected to the fiber collecting port 6 of the dispersion container 1. The PVA fibers 13 are initially fluffy after being blown and suspended by the fiber dispersion device. Then, the fluffy dry PVA fibers 13 after being blown by the wind are gradually put into the pulping container 8 filled with water, and the stirring component is started to make the dispersed fibers and water fully contact and rub violently with each other, so as to achieve the effects of mixing, emulsification, inflation and removal of part of the water. The obtained PVA fiber 13 slurry is evenly distributed, and a uniform suspension can be obtained again by slight stirring after static precipitation. The equipment can effectively solve the problem that the PVA fibers 13 are easy to agglomerate in water and difficult to be evenly dispersed in the slurry. Without adding a dispersant, the pulping concentration can reach 1% to 2%, and the obtained PVA fiber 13 slurry is evenly dispersed.

[0032] Specifically, the stirring assembly includes a stirring shaft 10, a motor 11 and a bracket 12; one end of the stirring shaft 10 is provided with a plurality of stirring blades 9, and the other end is connected to the motor 11; the motor 11 is mounted on the bracket 12. When in use, the end of the stirring shaft 10 with the stirring blades 9 is inserted into the pulping container 8, the motor 11 is started, and the stirring blades 9 are driven by the stirring shaft 10 to rotate, so that the dispersed fibers and water are fully mixed. The speed and stirring time of the stirring shaft 10 are designed according to needs, and the stirring speed is preferably greater than 2000r / min, the stirring time is at least 2min, and the slurry concentration of the PVA fiber 13 is 1%-2%.

[0033] In a detailed embodiment, the bracket 12 is a telescopic bracket. By adjusting the length of the telescopic bracket, the relative height of the stirring shaft 10, the stirring blade 9 and the pulping container 8 can be adjusted. During the stirring process, the height of the stirring blade 9 can be freely adjusted according to the depth of the slurry to achieve the desired stirring effect; after the stirring is completed, the stirring component is separated from the pulping container 8 to avoid the phenomenon of fiber hanging on the wall and sticking to the stirring shaft 10.

[0034] Optionally, the stirring blade 9 is as follows Figure 4 The four-piece rod type shown is used for forced beating, so that the dispersed fibers and water are fully in contact with each other and rub violently, achieving the effects of mixing, emulsification, aeration and partial water removal. During use, the stirring shaft 10 simultaneously performs planetary motion.

[0035] Embodiment 1:

[0036] Reference Figure 2 , this embodiment provides a fiber dispersing pulping device, including a fiber dispersing device and a pulping device.

[0037] The fiber dispersion device includes a blower 2, a fiber collecting bag and a dispersion container 1 with an inverted cone-shaped cross-section; a fiber collecting port 6 is provided on the top of the dispersion container 1, and a mesh screen 5 with a mesh diameter of 2.36 mm is provided at the fiber collecting port 6; the fiber collecting bag is connected to the fiber collecting port 6; a feed port 3 with a spiral feeder 4 is provided in the middle of the dispersion container 1; an air inlet is provided below the feed port 3; the air outlet of the blower 2 is connected to the air inlet of the dispersion container 1, the air outlet of the blower 2 is perpendicular to the side wall of the dispersion container 1, and the blowing direction is obliquely upward; a discharge port 7 is provided at the bottom of the dispersion container 1.

[0038] The pulping device includes a pulping container 8 and a stirring assembly; the stirring assembly includes a stirring shaft 10, a motor 11 and a telescopic bracket; one end of the stirring shaft 10 is provided with four rod-shaped stainless steel stirring blades 9, and the other end is connected to the motor 11; the motor 11 is installed on the telescopic bracket.

[0039] In actual use, a proper amount of municipal water at room temperature is placed in the pulping container 8, and the PVA fiber 13 with a fiber length of 6 mm is fed into the dispersion container 1 through the screw feeder 4. The main components of the fiber surface oil agent are polyol fatty acid ester + polyol alkylene oxide additives, which are hydrophilic oil agents. At the same time, the blower 2 is turned on to blow air obliquely upward. First, the wind speed is adjusted to a high wind speed (7m / s) for 2 minutes to reach the critical state of fiber dispersion, and then adjusted to a low wind speed (2.5m / s) for 30 seconds to make the fibers slightly aggregated, and then adjusted to a high wind speed for 3 minutes. The fiber collection bag above the mesh screen 5 collects the fluffy and soft PVA fibers 13.

[0040] The fluffy PVA fiber 13 dry material after being blown away by wind is gradually put into the pulping container 8, and the concentration is controlled at 1-2%. Adjust the telescopic bracket so that the stirring blade 9 extends into the pulping container 8, start the motor 11, and the speed is greater than 2000r / min. When the stirring blade 9 rotates, the stirring shaft 10 simultaneously performs slow planetary motion, so that the dispersed fibers and water are fully in contact with each other and rub violently, achieving the effects of mixing, emulsification, aeration and removing part of the water. After stirring for 2 minutes, a PVA fiber 13 slurry with uniform distribution and no agglomeration is obtained. Adjust the telescopic bracket upward so that the stirring blade 9 leaves the pulping container 8.

[0041] The PVA fiber 13 slurry prepared by the above equipment was used to prepare the autoclaved fiber cement board. The fiber distribution state on the surface and cross section of the board was observed. No clumps or bundles of fibers were found, and the fiber distribution on any cross section was uniform. At the same time, the discrete deviation of the flexural strength value of the board under the same density was small, and the flexural strength test value of each board did not exceed ±10% of the average flexural strength of the same batch of boards. After curing at 60°C and normal pressure for 12 hours, the flexural strength can reach the NAF A / B board R2 and C board R4 standards. After curing at 80°C and normal pressure for 12 hours, the flexural strength reaches the NAF A / B board R3 and C board R4 standards.

[0042] In summary, the fiber dispersion device provided by the utility model has a simple structure and is easy to use. It disperses the PVA fiber 13 raw material by wind power before pulping, which can effectively solve the problem that the PVA fiber 13 is easy to agglomerate in water and difficult to be evenly dispersed in the slurry. The fiber dispersion pulping equipment can obtain a uniform dispersion of the PVA fiber 13 slurry without adding a dispersant, and a uniform suspension can be obtained again by slightly stirring after static precipitation.

[0043] The fiber dispersion device and fiber dispersion pulping equipment provided by the utility model can be directly applied to the current mainstream slurry flow method and paper-taking method steam-free fiber cement board production line after being enlarged to industrial application, and will not affect the operation of other production sections.

[0044] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are identical or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A fiber dispersing device, Features: It comprises a dispersion container (1) and a blower (2); the dispersion container (1) is provided with a fiber collection port (6), a feed port (3) and an air inlet in sequence from top to bottom; the air outlet of the blower (2) is connected to the air inlet of the dispersion container (1), and the air inlet direction is upward.

2. The fiber dispersing device according to claim 1, Features: A screw feeder (4) is provided at the feed inlet (3).

3. The fiber dispersing device according to claim 1, Features: A mesh screen (5) is provided at the fiber collection port (6).

4. The fiber dispersing device according to claim 3, Features: The mesh diameter of the mesh screen (5) is 2.36 mm.

5. The fiber dispersing device according to claim 1, Features: A fiber collecting bag is provided at the fiber collecting port (6).

6. The fiber dispersing device according to claim 1, Features: The bottom of the dispersion container (1) is provided with a discharge port (7).

7. A fiber dispersion pulping device, It is characterized in that Comprising a fiber dispersing device as described in any one of claims 1-6.

8. The fiber dispersion pulping equipment according to claim 7, Features: It also includes a pulping device; the pulping device includes a pulping container (8) and a stirring assembly; the pulping container (8) is connected to the fiber collection port (6) of the dispersion container (1).

9. The fiber dispersion pulping device according to claim 8, Features: The stirring assembly comprises a stirring shaft (10), a motor (11) and a bracket (12); one end of the stirring shaft (10) is provided with a plurality of stirring blades (9), and the other end is connected to the motor (11); the motor (11) is mounted on the bracket (12).

10. The fiber dispersion pulping device according to claim 9, Features: The bracket (12) is a telescopic bracket.

Images