PVA (Polyvinyl Alcohol) loosening machine

Abstract

The utility model relates to the technical field of release equipment. More specifically, the utility model relates to a PVA (Polyvinyl Alcohol) loosening machine. The PVA loosening machine disclosed by the utility model can be used for stirring and loosening a certain amount of PVA fibers and water. After PVA and water are put into the tank body, the slurry reaches the center height of the feeding hole of the guide cylinder, enters the guide cylinder from the feeding hole, and starts to be released; under the high-speed rotation of the rotor, the slurry is thrown out through the gap between the stator and the rotor, touches the inner wall of the tank body and the baffle plate to change the direction, and upwards returns to the feeding hole again, so that an up-and-down circulating flow pattern is formed in the tank body. In this way, plane rotation and up-down mixing of slurry in the tank body are achieved, it is guaranteed that fibers in the tank make full contact with water and are dispersed, PVA fibers are fully loosened, no bunchy fibers exist basically, and the good dispersion effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of loosening equipment technology. More specifically, this utility model relates to a PVA loosening machine. Background Technology

[0002] Polyvinyl alcohol fiber (PVA fiber) is characterized by high strength, high modulus, low elongation, wear resistance, acid and alkali resistance, and good weather resistance. It exhibits excellent affinity and bonding with substrates such as cement and gypsum, and is non-toxic, non-polluting, and harmless to human skin, making it a new generation of high-tech green building materials. In calcium silicate board production lines, PVA can replace asbestos and some pulp as a reinforcing material, improving the board's compressive and flexural strength. However, typical PVA fibers have an aspect ratio >1000:1 (length 1-5mm, diameter 10-20μm), making them difficult to loosen under conventional paddle agitation (500rpm / min). This results in numerous bundled fibers, easy fiber entanglement, and poor fiber dispersion in water, making it difficult to meet the requirements of production lines. Utility Model Content

[0003] The purpose of this invention is to provide a PVA loosening machine that can fully loosen PVA fibers, leaving virtually no bundled fibers, thus achieving a good PVA fiber dispersion effect.

[0004] To achieve these objectives and other advantages according to the present invention, a PVA loosening machine is provided, comprising:

[0005] The tank body has an inlet and an outlet at its upper and lower ends, respectively.

[0006] A flow guide tube is vertically installed inside the tank and connected to the top wall of the tank. The flow guide tube is provided with a feed port and an air inlet, and the feed port is located below the air inlet.

[0007] Multiple baffles are spaced apart on the side wall of the tank. The baffles are vertically arranged, with their upper ends flush with the upper end of the feed hole and their lower ends connected to the bottom wall of the tank.

[0008] The stator is coaxially disposed at the lower end of the guide tube;

[0009] A stirring shaft is coaxially disposed inside the guide tube, and its upper end is connected to the drive mechanism.

[0010] A rotor, which is rotatably disposed within the stator and connected to the stirring shaft, has a gap between the stator and the rotor.

[0011] Furthermore, in the PVA loosening machine, the tank is cylindrical, the guide tube is coaxially disposed inside the tank, and the baffle plate is disposed radially along the tank.

[0012] Furthermore, in the PVA loosening machine, the length-to-diameter ratio of the tank is 1-1.2.

[0013] Furthermore, in the aforementioned PVA loosening machine, the bottom of the tank is a conical structure with a taper of 20-35°, and the discharge port is located on the side wall of the conical structure.

[0014] Furthermore, in the PVA loosening machine, the tank side wall is provided with an inspection port, the inspection port is provided with a corresponding inspection door, and the conical structure side wall is provided with a slag discharge port.

[0015] Furthermore, in the aforementioned PVA loosening machine, the driving mechanism includes:

[0016] An electric motor is mounted on the tank body;

[0017] Two pulleys are provided, with the stirring shaft extending upward through the tank and rotatably connected to it. The two pulleys are coaxially mounted on the stirring shaft and the output shaft of the motor, respectively.

[0018] A conveyor belt, with the two pulleys connected by a drive belt.

[0019] Furthermore, in the aforementioned PVA loosening machine, the driving mechanism further includes:

[0020] A channel steel frame is installed at the upper end of the tank body;

[0021] The bearing housing is connected to the channel steel frame. Deep groove ball bearings and self-aligning roller bearings are spaced apart vertically in the bearing housing. The stirring shaft is coaxially connected to the deep groove ball bearings and self-aligning roller bearings respectively.

[0022] Furthermore, in the PVA loosening machine, the upper end of the tank is provided with a cover plate corresponding to the feed inlet.

[0023] Furthermore, in the PVA loosening machine described above, the stator includes:

[0024] A stator disk is coaxially disposed at the lower end of the guide tube;

[0025] Multiple baffles are evenly distributed circumferentially at the lower end of the stator disk.

[0026] Furthermore, in the PVA loosening machine described above, the rotor includes:

[0027] A hub, which is connected to the stirring shaft;

[0028] A rotor disk is fitted onto the hub. Multiple straight blades are evenly distributed circumferentially at the lower end of the rotor disk, and multiple small blades are evenly distributed circumferentially at the lower end of the rotor disk. The upper inner side of the straight blades has a notch.

[0029] The beneficial effects of this utility model are:

[0030] 1. This utility model of a PVA loosening machine can be used to mix and loosen a certain amount of PVA fibers and water. After PVA and water are added to the tank, the slurry reaches the center height of the feed hole of the guide cylinder and enters the guide cylinder through the feed hole to begin loosening. Under the high-speed rotation of the rotor, the slurry is thrown out through the gap between the stator and the rotor, hits the inner wall of the tank and the baffle to change direction, and returns upward to the feed inlet, forming an up-and-down circulating flow pattern in the tank. This achieves planar swirling and up-and-down mixing of the slurry in the tank, ensuring sufficient contact and dispersion of the fibers and water in the tank, so that the PVA fibers are fully loosened, with basically no bundled fibers, achieving a good dispersion effect.

[0031] 2. The PVA loosening machine of this invention features a tank with a relatively small length-to-diameter ratio (1-1.2). During operation, a low loading coefficient (0.6-0.7) is used to meet the requirements of high-speed stirring. The bottom of the tank is tapered (20°-35°) to eliminate dead angles at the junction of the tank wall and bottom, while simultaneously generating greater velocity fluctuations in the liquid during flow, increasing suspension efficiency. Multiple baffles are installed on the sides of the tank, extending to the height of the feed inlet. Strong tangential flow collides with the tank wall and baffles, transforming into a strong upward flow that returns to the feed inlet, thus forming an axial circulation. Additionally, the tank is equipped with an inspection door and a slag discharge port for easy cleaning.

[0032] 3. The PVA loosening machine of this utility model is equipped with a guide tube, which extends to the top of the rotor and is fixed to the top wall of the tank. Multiple feed holes and vent holes are evenly distributed on the upper part of the guide tube. The guide tube defines the flow path of the slurry. The slurry is drawn in through the feed holes of the guide tube, flows downward inside the guide tube, and flows upward within the annular system of the guide tube and the tank, forming a circulation that enhances the mixing and dispersion process.

[0033] 4. The rotor of this PVA loosening machine adopts a disc turbine-type stirring blade, fixed to the end of the stirring shaft. The rotor uses multiple straight blades, with the inner side of the blades recessed to receive the feed from the central hole of the stator while reducing the power load. The outer side has a relatively high height, which can generate a strong tangential flow during high-speed rotation. Multiple small blades are welded to the bottom of the disc, which not only prevents sedimentation at the bottom of the tank but also enhances the stirring effect of the rotor.

[0034] 5. The PVA loosening machine of this invention uses the high-speed rotation of the blades to continuously and rapidly draw in and discharge the slurry in the guide tube. The relative motion between the rotor and stator generates strong shearing, impact, crushing, and grinding effects, achieving excellent loosening and dispersion of PVA fibers in a short time.

[0035] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the PVA loosening machine described in this utility model;

[0037] Figure 2 This is a cross-sectional view of the PVA loosening machine described in this utility model;

[0038] Figure 3 This is a top view of the PVA loosening machine described in this utility model;

[0039] Figure 4 This is a schematic diagram showing the connection between the stator and rotor described in this utility model;

[0040] Figure 5 This is a bottom view of the stator described in this utility model;

[0041] Figure 6 This is a top view of the rotor described in this utility model;

[0042] Figure 7 This is a cross-sectional view of the rotor described in this utility model.

[0043] The reference numerals in the attached figures are as follows:

[0044] Tank body 1; discharge port 11; inspection door 12; slag discharge port 13; cover plate 14; guide tube 2; feed hole 21; air inlet 22; baffle plate 3; stator 4; stator disc 41; baffle 42; stirring shaft 5; rotor 6; hub 61; rotor disc 62; straight blade 63; small blade 64; motor 71; pulley 72; conveyor belt 73; channel steel frame 74; bearing seat 75; sealing cover plate 76; sealing cover 77. Detailed Implementation

[0045] The present invention will be further described in detail below with reference to the embodiments, so that those skilled in the art can implement it based on the description.

[0046] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 element 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.

[0047] like Figures 1-4 As shown, an embodiment of this utility model provides a PVA loosening machine, comprising:

[0048] The tank body 1 has an inlet and an outlet 11 at its upper and lower ends, respectively; a cover plate 14 corresponding to the inlet is provided inside the upper end of the tank body 1, and a valve is provided at the outlet 11; the tank body 1 is cylindrical, and the length-to-diameter ratio of the tank body 1 is 1-1.2; the bottom of the tank body 1 is a conical structure with a taper of 20-35°, and the outlet 11 is located on the side wall of the conical structure; specifically, as shown... Figure 3 As shown, the tank body 1 has an opening at the top. A channel steel frame 74 spans the middle portion of the opening at the top of the tank body 1 and is welded to the tank body 1. The feed inlet is located on the channel steel frame 74, and the cover plate 14 is hinged to the channel steel frame 74. Sealing cover plates 76 are respectively provided on both sides of the channel steel frame 74, sealing the opening at the top of the tank body 1 through the sealing cover plates 76 and the channel steel frame 74; the feed inlet is located on the channel steel frame 74, and the cover plate 14 is hinged to the channel steel frame, connecting to the cover plate 14 and the channel steel frame 74. In addition, one of the sealing cover plates 76 is also provided with a dust collection port, which can be connected to external dust removal equipment to remove dust from the inside of the tank body 1. When the dust collection port is not connected to dust removal equipment, the dust collection port is sealed by a sealing cover 77.

[0049] The guide tube 2 is coaxially arranged inside the tank body 1 and connected to the channel steel frame 74. The upper end of the guide tube 2 is provided with a flange, which is fixed to the channel steel frame 74 by multiple bolts. The guide tube 2 is provided with three feed holes 21 and three air inlets 22, and the feed holes are located below the air inlets 22.

[0050] Three baffle plates 3 are evenly distributed on the side wall of the tank body 1 along the circumference. The baffle plates 3 are vertically arranged along the radial direction of the tank body 1, with their upper ends flush with the upper end of the feed hole 21 and their lower ends connected to the bottom wall of the tank body 1.

[0051] Stator 4 is coaxially disposed at the lower end of the guide tube 2; for example Figure 5 As shown, the stator 4 includes:

[0052] The stator disk 41 is coaxially disposed at the lower end of the guide tube 2, and the outer periphery of the lower end of the stator disk 41 is connected to the lower end of the guide tube 2.

[0053] Multiple baffles 42 are evenly distributed circumferentially at the lower end of the stator disk 41.

[0054] The stirring shaft 5 is coaxially arranged inside the guide tube 2, and its upper end is connected to the drive mechanism.

[0055] Rotor 6, rotatably disposed within stator 4 and connected to stirring shaft 5, has a gap between stator 4 and rotor 6. Figures 6-7 As shown, the rotor 6 includes:

[0056] Hub 61, which is connected to the stirring shaft 5;

[0057] The rotor disk 62 is fitted onto the hub 61. Six straight blades 63 are evenly distributed circumferentially at the lower end of the rotor disk 62, and six small blades 64 are also evenly distributed circumferentially at the lower end of the disk. The upper inner side of each straight blade 63 has a notch, and the upper inner side of the straight blade 63 is recessed to receive feed from the central hole of the stator 4 while reducing the power load. The external structure has a relatively high height, which can generate a strong tangential flow during high-speed rotation. The rotor 6 is located inside the stator 4, and the straight blades 63, rotor disk 62, and small blades 64 are all located within a cylindrical space formed by multiple baffles 42.

[0058] In this embodiment, the cover plate 14 is opened, and PVA and water are fed into the tank 1 from here. Feeding stops when the slurry reaches the center height of the feed inlet of the guide cylinder. The slurry then enters the guide cylinder 2 through the feed hole 21 and begins to loosen. The rotor 6 rotates at high speed, generating a strong tangential flow of slurry. The tangential flow of slurry collides with the baffles 42 of the stator 4 and is thrown out along the gap between the horizontal baffles 42 at a certain angle, returning upwards to the feed inlet, forming an up-and-down circulating flow pattern within the tank 1. This achieves planar swirling and up-and-down mixing of the slurry within the tank 1, ensuring sufficient contact and dispersion of the fibers and water, allowing the PVA fibers to be fully loosened, with virtually no bundled fibers, achieving a good dispersion effect. The optimal operating parameters for the PVA loosening machine in this embodiment are: PVA concentration of 5‰-1.2% after mixing PVA and water, PVA length of 2-10mm, loading coefficient of 0.6-0.7, and rotor speed of 1000r / min.

[0059] Preferably, in another embodiment of the present invention, the tank body 1 is provided with an inspection port on its side wall, and a corresponding inspection door 12 is provided at the inspection port. The conical structure is provided with a slag discharge port 13 on its side wall, and a valve is provided at the slag discharge port 13.

[0060] In this embodiment, when it is necessary to clean and repair the PVA loosening machine, the inspection door 12 and the slag discharge port 13 can be opened to clean the debris in the tank 1.

[0061] Preferably, in another embodiment of the present invention, the driving mechanism includes:

[0062] Motor 71, which is mounted on the tank body 1;

[0063] Two pulleys 72 are provided, and the stirring shaft 5 extends upward through the tank body 1 and is rotatably connected to it. The two pulleys 72 are respectively coaxially mounted on the stirring shaft 5 and the output shaft of the motor 71.

[0064] The two pulleys 72 are connected by the conveyor belt 73.

[0065] In this embodiment, the two pulleys 72 are connected by a conveyor belt 73. When the motor 71 is working, it synchronously drives the stirring shaft 5 to rotate. Both pulleys 72 adopt a conical sleeve installation method, which is convenient for processing and disassembly.

[0066] Preferably, in another embodiment of the present invention, the driving mechanism further includes:

[0067] The bearing housing 75 is connected to the channel steel frame 74. Deep groove ball bearings and self-aligning roller bearings are provided at intervals in the bearing housing 75. The stirring shaft 5 is coaxially connected to the deep groove ball bearings and self-aligning roller bearings respectively.

[0068] In this embodiment, the connection between the stirring shaft 5 and the bearing housing 75 adopts a combination of deep groove ball bearings and self-aligning roller bearings to ensure the stability of the stirring shaft 5 when it rotates at high speed.

[0069] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and embodiments shown and described herein.

Claims

1. A PVA loosening machine, characterized in that, include: The tank body has an inlet and an outlet at its upper and lower ends, respectively. A flow guide tube is vertically installed inside the tank and connected to the top wall of the tank. The flow guide tube is provided with a feed port and an air inlet, and the feed port is located below the air inlet. Multiple baffles are spaced apart on the side wall of the tank. The baffles are vertically arranged, with their upper ends flush with the upper end of the feed hole and their lower ends connected to the bottom wall of the tank. The stator is coaxially disposed at the lower end of the guide tube; A stirring shaft is coaxially disposed inside the guide tube, and its upper end is connected to the drive mechanism. A rotor, which is rotatably disposed within the stator and connected to the stirring shaft, has a gap between the stator and the rotor.

2. The PVA loosening machine as described in claim 1, characterized in that, The tank is cylindrical, the guide tube is coaxially disposed inside the tank, and the baffle plate is disposed radially along the tank.

3. The PVA loosening machine as described in claim 1, characterized in that, The length-to-diameter ratio of the tank body is 1-1.

2.

4. A PVA loosening machine as described in claim 1, characterized in that, The bottom of the tank is a conical structure with a taper of 20-35°, and the discharge port is located on the side wall of the conical structure.

5. A PVA loosening machine as described in claim 4, characterized in that, The tank body has an inspection port on its side wall, and a corresponding inspection door is provided at the inspection port. The conical structure has a slag discharge port on its side wall.

6. A PVA loosening machine as described in claim 1, characterized in that, The drive mechanism includes: An electric motor is mounted on the tank body; Two pulleys are provided, with the stirring shaft extending upward through the tank and rotatably connected to it. The two pulleys are coaxially mounted on the stirring shaft and the output shaft of the motor, respectively. A conveyor belt, with the two pulleys connected by a drive belt.

7. A PVA loosening machine as described in claim 6, characterized in that, The drive mechanism also includes: A channel steel frame is installed at the upper end of the tank body; The bearing housing is connected to the channel steel frame. Deep groove ball bearings and self-aligning roller bearings are spaced apart vertically in the bearing housing. The stirring shaft is coaxially connected to the deep groove ball bearings and self-aligning roller bearings respectively.

8. A PVA loosening machine as described in claim 1, characterized in that, The upper part of the tank is provided with a cover plate corresponding to the feed inlet.

9. A PVA loosening machine as described in claim 1, characterized in that, The stator includes: A stator disk is coaxially disposed at the lower end of the guide tube; Multiple baffles are evenly distributed circumferentially at the lower end of the stator disk.

10. A PVA loosening machine as described in claim 1, characterized in that, The rotor includes: A hub, which is connected to the stirring shaft; A rotor disk is fitted onto the hub. Multiple straight blades are evenly distributed circumferentially at the lower end of the rotor disk, and multiple small blades are evenly distributed circumferentially at the lower end of the rotor disk. The upper inner side of the straight blades has a notch.

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