A stirring device for dispersing special fibers and its usage method

Abstract

This invention belongs to the technical field of mixing equipment, specifically relating to a mixing device and its method for dispersing special fibers. The device includes a conical-bottomed, rounded-corner vessel, which is divided into a conical feeding zone and a cylindrical mixing zone. A screen is provided between the conical feeding zone and the cylindrical mixing zone. A mixing bearing seat is fixedly installed on the screen. The mixing bearing seat is rotatably connected to the lower end of a mixing shaft. Multiple hemispherical secondary mixing blades are fixedly installed on the upper middle part of the mixing shaft, and multiple "U"-shaped bottom mixing blades are fixedly installed on the lower part of the mixing shaft. The "U"-shaped bottom mixing blades of this invention have a small distance between them and the screen, and the multiple "U"-shaped bottom mixing blades are evenly distributed, increasing the mixing area and improving mixing efficiency. The arc and shape of the hemispherical secondary mixing blades allow for a more natural cut into the water flow, preventing sharp edges from cutting into the water flow and creating intense turbulence and water splashes that introduce large amounts of gas, forming more bubbles.

Description

Technical Field

[0001] This invention belongs to the technical field of mixing equipment, specifically relating to a mixing device for dispersing special fibers and its usage method. Background Technology

[0002] In the early stages of preparing special fiber membrane materials, some processes require uniformly dispersing the fibers in a solution before proceeding to the main processing steps. Throughout the entire process, the solution preparation and dispersion stage has a decisive impact on product quality. Especially in continuous production, this process must achieve three key points: increasing the slurry dispersion ratio to 95% or higher within a limited residence time; minimizing the entry of undispersed clumps into subsequent processes; and maintaining process stability throughout the continuous process, excluding initial and final materials.

[0003] However, in traditional processes, the prepared slurry often has low dispersion and contains a large number of micro-clusters. During the manufacturing cycle, sedimentation and agglomeration occur in the dead zone of the container, affecting product quality in the next stage. Traditional turbine-type agitators require the use of turbulence-generating sections on the vessel body to improve dispersion within a limited time. While these sections can create turbulent vortices, the linear velocity of the slurry decreases upon collision with them, leading to stagnation at protrusions or depressions on the vessel wall and fiber cross-agglomeration. Furthermore, although the agitator blades in traditional vessels can generate turbulence, the numerous turbulent vortices formed at the blade edges also introduce a large amount of gas, forming bubbles. This causes fibers and bubbles to adhere together, forming lightweight micro-clusters. These micro-clusters, generated later by the vessel's configuration, require long-term agitation to reduce, making continuous slurry supply impossible. Multiple agitators need to be switched and alternated for slurry supply, affecting batch-to-batch product quality consistency, generating significant waste during switching, and requiring substantial equipment investment.

[0004] Another type of traditional mixing method is the cone-shaped agitator. The agitator blade is cone-shaped, typically consisting of a conical surface and a base. The conical surface is the main working part of the agitator, while the base connects to the mixing shaft. When the cone-shaped agitator rotates, its conical structure results in different linear velocities at different radii. The linear velocity is lower near the mixing shaft and higher further away. This velocity difference leads to varying fluid flow velocities in different regions, creating a velocity gradient. When this velocity gradient reaches a certain level, it can easily cause fluid instability, leading to turbulence. Furthermore, the cone-shaped agitator simultaneously generates axial and radial flows. Axial flow causes the fluid to circulate up and down within the mixing container, while radial flow creates a circular flow. These two flows intertwine and collide, causing the fluid's flow direction and velocity to constantly change, increasing the degree of turbulence and promoting turbulence formation. Fibers in the slurry can be dispersed in a short time in the turbulence created by the conical agitator blades. Therefore, dispersion vessels using conical agitators often do not require a turbulence section, and the smooth cylindrical vessel wall can effectively reduce micro-clumps generated by dead zones. However, compared with other types of agitators, conical agitators have lower shear force, making it difficult to tear apart stubborn agglomerates, especially for heavier clumps. The weaker tangential flow of the conical agitator blades is insufficient to agitate and break up the clumps. Summary of the Invention

[0005] This invention addresses the problem of low slurry dispersion by providing a stirring device for dispersing special fibers and its usage method.

[0006] To achieve the above objectives, the present invention employs the following technical solution: A stirring device for dispersing special fibers, comprising a conical-bottomed round-corner kettle. The conical-bottomed round-corner kettle is divided into a conical feeding area and a cylindrical stirring area. A screen is provided between the conical feeding area and the cylindrical stirring area. A stirring bearing seat is fixedly installed on the screen. A servo torque motor is fixedly installed at the center of the upper end face of the conical-bottomed round-corner kettle. The output shaft of the servo torque motor passes through the conical-bottomed round-corner kettle and is connected to the upper end of the stirring shaft through a coupling. The lower end of the stirring shaft is rotatably connected to the stirring bearing seat. A plurality of hemispherical secondary stirring blades are fixedly installed in the upper middle part of the stirring shaft. The plurality of hemispherical secondary stirring blades are uniformly distributed in a circle with the stirring shaft as the center. A plurality of "in"-shaped bottom stirring blades are fixedly installed in the lower part of the stirring shaft. The plurality of "in"-shaped bottom stirring blades are uniformly distributed in a circle with the stirring shaft as the center. One end of a slurry inlet pipe is connected to the slurry inlet of the conical feeding area. The other end of the slurry inlet pipe is fixedly connected to a servo feeding pump. An electronically controlled slurry inlet valve is provided on the slurry inlet pipe. A slurry supply pipe is fixedly connected to the lower part of the side wall of the cylindrical stirring area. The slurry supply pipe is communicated with the outside. An electronically controlled slurry supply valve is provided on the slurry supply pipe. A liquid level sensor is provided on the side wall of the conical-bottomed round-corner kettle to facilitate detecting the height of the slurry inside the conical-bottomed round-corner kettle. The "in"-shaped bottom stirring blade includes a main stirring blade and a trapezoidal groove comb-shaped secondary blade. The main stirring blade and the trapezoidal groove comb-shaped secondary blade are set as an integral structure. The main stirring blade is divided into an upper folding surface and a lower folding surface. The included angle γ between the upper folding surface and the trapezoidal groove comb-shaped secondary blade is 30°-90°. The included angle β between the upper folding surface and the lower folding surface is 90°-175°. A plurality of rows of first gourd-shaped through holes are opened in the lower part of the upper folding surface, and multiple first gourd-shaped through holes in each row are arranged evenly. A plurality of rows of second gourd-shaped through holes are arranged in the middle of the lower folding surface, and multiple second gourd-shaped through holes in each row are arranged evenly. The side edge of the "in"-shaped bottom stirring blade coincides with the edge of the screen. The side edge of the main stirring blade is an "S"-shaped transition edge.

[0007] Further, the trapezoidal groove comb-shaped secondary blade is fixedly installed at the lower end of the upper folding surface. The trapezoidal groove comb-shaped secondary blade includes a plurality of trapezoids. The plurality of trapezoids are uniformly arranged and fixed on the upper folding surface. An isosceles trapezoidal groove is formed between adjacent two trapezoids. The bottom surface of the isosceles trapezoidal groove faces the lower folding surface, and the lower surface of the trapezoidal groove comb-shaped secondary blade and the lower surface of the lower folding surface are arranged on the same plane.

[0008] Still further, the hemispherical secondary stirring blades are installed at 2 / 3-4 / 5 of the total height from the bottom of the stirring shaft. The inclination angle of the hemispherical secondary stirring blades is 30°-75°. A plurality of rows of third gourd-shaped through holes are evenly distributed on the hemispherical secondary stirring blades, and multiple third gourd-shaped through holes in each row are arranged evenly.

[0009] Furthermore, the stirring bearing seat includes a base cup, inside which there are balls. The bottom of the stirring shaft is a cone, and an arc-shaped groove is opened at the bottom of the cone, corresponding to the balls. A conical sealing sleeve is provided between the base cup and the stirring shaft.

[0010] Furthermore, the distance between the lower surface of the "in" - shaped bottom stirring blade and the screen is 2 mm - 10 mm.

[0011] Furthermore, the slurry supply pipe is arranged between the "in" - shaped bottom stirring blade and the hemispherical secondary stirring blade. The slurry supply pipe is set in this area, and the slurry meeting the process requirements will continuously enter the next process section under the action of gravity or the next - stage slurry supply pump.

[0012] Furthermore, for the first gourd - shaped through - hole, the second gourd - shaped through - hole and the third gourd - shaped through - hole, the ratio of the arc length L1 of the inner large - circle cross - section to the arc length L2 of the inner small - circle cross - section is K1, and 1.2 ≤ K1 ≤ 4. The ratio of the diameter R1 of the inlet small hole to the diameter R2 of the outlet large hole of the first gourd - shaped through - hole, the second gourd - shaped through - hole and the third gourd - shaped through - hole is K2, and 0.2 ≤ K2 ≤ 0.75.

[0013] Furthermore, the servo - feeding pump, the electronically - controlled slurry supply valve, the electronically - controlled slurry inlet valve and the liquid - level sensor are all connected to an external controller. The controller controls the opening and closing of the electronically - controlled slurry supply valve and the electronically - controlled slurry inlet valve by receiving the signal from the liquid - level sensor.

[0014] A method for using a stirring device for special fiber dispersion: Open the electronically - controlled slurry inlet valve and close the electronically - controlled slurry supply valve at the same time. The servo - feeding pump transports the slurry to be processed through the slurry inlet pipe into the conical - rounded - corner kettle. When the liquid - level sensor detects that the slurry inlet height reaches the preset position, the servo - feeding pump and the electronically - controlled slurry inlet valve are closed. When the slurry to be processed enters the conical - rounded - corner kettle, start the servo - torque motor to drive the hemispherical secondary stirring blade and the "in" - shaped bottom stirring blade to rotate. When the stirring speed reaches the preset value, continuous stirring is carried out. After the servo - torque motor starts and runs a complete stirring process as required, on the premise of maintaining the liquid level in the kettle, the external controller synchronously opens the electronically - controlled slurry inlet valve and the electronically - controlled slurry supply valve for continuous feeding, and delays for 1 - 2 s to start the servo - feeding pump. The external controller continuously receives the signal from the liquid - level sensor and simultaneously regulates the electronically - controlled slurry inlet valve and the electronically - controlled slurry supply valve, so as to achieve a dynamic - balance continuous production mode.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The distance between the "V"-shaped bottom stirring blades and the sieve of the present invention is small, and multiple "V"-shaped bottom stirring blades are evenly distributed, increasing the stirring area and improving the stirring efficiency. At the same time, the main stirring blade is provided with a first gourd-shaped through hole and a second gourd-shaped through hole, which can form three obvious volume expansion regions, and multiple groups of turbulent flows are formed progressively. While effectively realizing stirring, the resistance loss is reduced. At the same time, the water pressure on the short side of the isosceles trapezoid groove of the trapezoidal groove comb-shaped auxiliary blade is greater than that on the long side. Turbulent flow is formed on the long side to disperse and mix the slurry again, and on the short side, the relatively high water pressure and the inclined downward pressure of the trapezoid body part will form an impact water flow on the sieve. The impact water flow will disperse and displace the fiber clusters hooked between the sieve pores, playing a role in flushing the fiber clusters back into the circulation again, and the "S" shape transition between the upper folding surface and the lower folding surface of the main stirring blade increases the coverage area of the lower folding surface on the sieve and enhances the shear turbulent flow effect at the edge of the lower folding surface. At the same time, it weakens the shear turbulent flow effect at the edge of the upper folding surface, allowing the slurry near the sieve to be fully dispersed and mixed while continuing to move upward, ensuring the coherence and continuity of stirring and improving the stirring efficiency.

[0016] 2. The design of the hemispherical secondary stirring blade of the present invention. The radian and shape of the hemispherical secondary stirring blade can cut into the water flow more naturally, eliminating the formation of intense turbulent flow and splashing of water flowers with sharp edges cutting into the water flow, which would bring in a large amount of gas to form more bubbles. At the same time, the hemispherical secondary stirring blade is provided with multiple third gourd-shaped through holes, which can form multiple groups of turbulent flows progressively, more effectively realizing multiple dispersions, mixings, impacts, and breaking the attachment of bubbles, and improving the stirring efficiency.

[0017] 3. The stirring bearing seat of the present invention is designed as a base cup. The bottom of the base cup is a circular arc-shaped depression with balls inside. The bottom of the stirring shaft is a cone body, and its center is a circular arc-shaped depression that contacts the balls, reducing the rotational resistance of the stirring shaft while being able to withstand the impact resistance brought by the start of a certain servo torque motor and the disturbance during rotational stirring. The conical surface between the bottom cone body of the stirring shaft and the base cup is separated by a conical seal sleeve. The material of the conical seal sleeve can be various sealing rubbers or graphite or copper, achieving dynamic sealing while reducing rotational resistance, extending the equipment life, and reducing energy consumption.

[0018] 4. The slow start of the servo torque motor of the present invention can make the slurry gradually follow the movement of the "V"-shaped bottom stirring blades and the hemispherical secondary stirring blades, avoiding local accumulation or splashing of materials caused by rapid start, thereby improving the uniformity of material stirring.

[0019] 5. The position height of the slurry supply pipe of the present invention is higher than the "inverted V" bottom stirring blade but lower than the hemispherical secondary stirring blade. The degree of slurry dispersion in the area between the "inverted V" bottom stirring blade and the hemispherical secondary stirring blade is the highest. Therefore, the slurry supply pipe is set in this area, so that the slurry meeting the process requirements continuously enters the next process under the action of gravity or the next-stage slurry supply pump, maintaining the continuity of output.

[0020] 6. The screen of the present invention can effectively block the agglomerates that are not fully dispersed during the conveying process, allowing them to have sufficient time to participate in the process of re-dispersion, rather than directly entering the next process and affecting the yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a front view of the present invention; Figure 3 is a schematic structural diagram of the "inverted V" bottom stirring blade of the present invention; Figure 4 is a schematic view of the blade surface of the "inverted V" bottom stirring blade of the present invention; Figure 5 is a schematic structural diagram of the hemispherical secondary stirring blade of the present invention; Figure 6 is a schematic structural diagram of the stirring bearing seat and the stirring shaft of the present invention; Figure 7 is a schematic diagram of the coordinates corresponding to the parabolic equation of the hemispherical secondary stirring blade of the present invention; In the figure, conical round-cornered kettle 1, conical feeding area 2, cylindrical stirring area 3, screen 4, stirring bearing seat 5, servo torque motor 6, stirring shaft 7, hemispherical secondary stirring blade 8, "inverted V" bottom stirring blade 9, slurry inlet pipe 10, electric control slurry inlet valve 11, slurry supply pipe 12, electric control slurry supply valve 13, liquid level sensor 14, main stirring blade 15, trapezoidal groove comb-shaped secondary blade 16, upper folding surface 17, lower folding surface 18, first gourd-shaped through hole 19, second gourd-shaped through hole 20, trapezoid body 21, base support cup 22, ball 23, cone body 24, arc-shaped groove 25, conical sealing sleeve 26, servo feeding pump 27, third gourd-shaped through hole 28. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to further elaborate the technical solution of the present invention, the present invention will be further described below through embodiments.

[0023] Such as Figure 1 and Figure 2As shown in the figure, a stirring device for dispersing special fibers includes a conical-bottomed round-corner kettle 1, which is divided into a conical feeding area 2 and a cylindrical stirring area 3. A screen 4 is provided between the conical feeding area 2 and the cylindrical stirring area 3. A stirring bearing seat 5 is fixedly installed on the screen 4. A servo torque motor 6 is fixedly installed at the center of the upper end face of the conical-bottomed round-corner kettle 1. The output shaft of the servo torque motor 6 passes through the conical-bottomed round-corner kettle 1 and is connected to the upper end of a stirring shaft 7 through a coupling. The lower end of the stirring shaft 7 is rotatably connected to the stirring bearing seat 5. A plurality of hemispherical secondary stirring blades 8 are fixedly installed in the middle and upper part of the stirring shaft 7. The plurality of hemispherical secondary stirring blades 8 are uniformly distributed in a circular shape with the stirring shaft 7 as the center. A plurality of "in" - shaped bottom stirring blades 9 are fixedly installed at the lower part of the stirring shaft 7. The plurality of "in" - shaped bottom stirring blades 9 are uniformly distributed in a circular shape with the stirring shaft 7 as the center. One end of a slurry inlet pipe 10 is connected to the slurry inlet of the conical feeding area 2. The other end of the slurry inlet pipe 10 is fixedly connected to a servo feeding pump 27. An electronically controlled slurry inlet valve 11 is provided on the slurry inlet pipe 10. A slurry supply pipe 12 is fixedly connected to the lower part of the side wall of the cylindrical stirring area 3. The slurry supply pipe 12 is arranged between the "in" - shaped bottom stirring blades 9 and the hemispherical secondary stirring blades 8. The slurry supply pipe 12 is communicated with the outside. The slurry supply pipe 12 is set up in this area, and the slurry meeting the process requirements will continuously enter the next process under the action of gravity or the next-stage slurry supply pump. An electronically controlled slurry supply valve 13 is provided on the slurry supply pipe 12. A liquid level sensor 14 is provided on the side wall of the conical-bottomed round-corner kettle 1 to facilitate detecting the height of the slurry inside the conical-bottomed round-corner kettle 1. The servo feeding pump 27, the electronically controlled slurry supply valve 13, the electronically controlled slurry inlet valve 11 and the liquid level sensor 14 are all connected to an external controller. The controller controls the opening and closing of the electronically controlled slurry supply valve 13 and the electronically controlled slurry inlet valve 11 by receiving the signal from the liquid level sensor 14.

[0024] As Figure 3As shown, the "in" - shaped bottom stirring blade 9 includes a main stirring blade 15 and a trapezoidal - groove comb - shaped secondary blade 16. The main stirring blade 15 and the trapezoidal - groove comb - shaped secondary blade 16 are set as an integral structure. The main stirring blade 15 is divided into an upper folding surface 17 and a lower folding surface 18. The included angle γ between the upper folding surface 17 and the trapezoidal - groove comb - shaped secondary blade 16 is 30° - 90°. The included angle β between the upper folding surface 17 and the lower folding surface 18 is 90° - 175°. Multiple rows of first gourd - shaped through - holes 19 are opened at the lower part of the upper folding surface 17, and multiple first gourd - shaped through - holes 19 in each row are arranged evenly. Multiple rows of second gourd - shaped through - holes 20 are arranged in the middle of the lower folding surface 18, and multiple second gourd - shaped through - holes 20 in each row are arranged evenly. The heights of both the first gourd - shaped through - holes 19 and the second gourd - shaped through - holes 20 do not exceed 1 / 2 of the total height of the main stirring blade 15. The side edge of the "in" - shaped bottom stirring blade 9 coincides with the edge of the screen 4. The distance between the "in" - shaped bottom stirring blade 9 and the screen 4 is 2 mm - 10 mm. The side edge of the main stirring blade 15 is set as an "S" - shaped transition edge. The trapezoidal - groove comb - shaped secondary blade 16 is fixedly installed at the lower end of the upper folding surface 17. The trapezoidal - groove comb - shaped secondary blade 16 includes multiple trapezoids 21. Multiple trapezoids 21 are arranged and fixed on the upper folding surface evenly. An isosceles trapezoidal groove is formed between two adjacent trapezoids 21. The bottom surface of the isosceles trapezoidal groove faces the lower folding surface 18, and the lower surface of the trapezoidal - groove comb - shaped secondary blade 16 and the lower surface of the lower folding surface 18 are on the same plane. The water pressure on the short - side of the isosceles trapezoidal groove of the trapezoidal - groove comb - shaped secondary blade 16 is greater than that on the long - side. Turbulence will be formed on the long - side to re - disperse and mix the slurry. The short - side will form an impact water flow with relatively high water pressure and the trapezoid part inclined downward, which will impact the screen. The impact water flow will disperse and displace the fiber clusters hooked in the gaps of the screen 4, playing a role in washing the fiber clusters back into the cycle again.

[0025] As Figure 1 shown, the hemispherical secondary stirring blade 8 is installed at 2 / 3 - 4 / 5 of the total height from the bottom of the stirring shaft 7. The inclination angle of the hemispherical secondary stirring blade 8 is 30° - 75°. Multiple rows of third gourd - shaped through - holes 28 are evenly distributed on the hemispherical secondary stirring blade 8, and multiple third gourd - shaped through - holes 28 in each row are arranged evenly. As Figure 7 shown, the edge - curve shape of the cylindrical stirring area 3 and the shape of the middle backbone line of the back of the hemispherical secondary stirring blade 8 conform to the parabola equation:

[0026] where x is the width coordinate of the hemispherical secondary stirring blade, y is the length coordinate of the hemispherical secondary stirring blade, c is the maximum bending height of the hemispherical secondary stirring blade 8, and L is the radius of the hemispherical secondary stirring blade.

[0027] Figure 6 As ​As shown, the stirring bearing seat 5 includes a base cup 22. Inside the base cup 22, there are balls 23. The bottom of the stirring shaft 7 is formed as a conical body 24. An arc-shaped groove 25 is formed at the bottom of the conical body 24. The arc-shaped groove 25 corresponds to the balls 23. A conical sealing sleeve 26 is provided between the base cup 22 and the stirring shaft 7.

[0028] As Figure 3 and Figure 5 shown, for the first gourd-shaped through hole 19, the second gourd-shaped through hole 20 and the third gourd-shaped through hole 28, the ratio between the arc length L1 of the inner large circle cross-section and the arc length L2 of the inner small circle cross-section is K1, and 1.2 ≤ K1 ≤ 4. The ratio between the diameter R1 of the inlet small hole and the diameter R2 of the outlet large hole of the first gourd-shaped through hole 19, the second gourd-shaped through hole 20 and the third gourd-shaped through hole 28 is K2, and 0.2 ≤ K2 ≤ 0.75.

[0029] A method for using a stirring device for special fiber dispersion. Open the electric control slurry inlet valve 11 and close the electric control slurry supply valve 13 at the same time. The servo feeding pump 27 transports the slurry to be processed through the slurry inlet pipe 10 to the conical rounded-bottom kettle 1. Under the dual action of the main stirring blade 15 and the servo feeding pump 27, the slurry will reciprocate through the screen 4. When the liquid level sensor 14 detects that the slurry inlet height reaches the preset position, the electric control slurry inlet valve 11 is closed. When the slurry to be processed enters the conical rounded-bottom kettle 1, start the servo torque motor 6 to drive the hemispherical secondary stirring blade 8 and the "in"-shaped bottom stirring blade 9 to rotate. The starting curve of the servo torque motor 6 satisfies:

[0030] Where vmax is the maximum set stirring speed reached by the stirring blade, T is the set total time required to reach the maximum speed, a is the slurry characteristic parameter, t is the instantaneous time, and v(t) is the rotational speed corresponding to the instantaneous time. When the stirring speed reaches Vmax, continuous stirring will occur. Part of the slurry will rise under the impact force of the upper folding surface 17 of the main stirring blade 15 and the servo feed pump 27, while another part of the heavier slurry will pass through the second gourd-shaped through hole 20 of the lower folding surface 18, forming multiple sets of turbulent flows. The relatively high water pressure on the bottom side and the downward tilting motion of the teeth of the trapezoidal comb-shaped auxiliary blade 16 will create an impact water flow on the screen 4. The impact water flow will disperse and displace the slurry clumps hooked in the gaps of the screen 4, and flush the slurry clumps back into the circulation. At the same time, it will reduce the shear turbulence at the edge of the upper folding surface 17, allowing the slurry near the screen 4 to be fully dispersed and mixed while continuing to rise. During the dispersion and stirring process, there is also a type of light mass clump with a large number of tiny air bubbles attached. Under the action of buoyancy, they As the longitudinal turbulence rises to the upper liquid level, it remains in this area for a long time, forming a slurry. The slurry, upon reaching the upper liquid level, is acted upon by the hemispherical secondary agitator blades 8. Part of the slurry passes through the several rows of gourd-shaped through holes 28 on the hemispherical secondary agitator blades 8, while the other part re-enters the vertical circulation process due to the longitudinal turbulence formed by the tilt angle of the hemispherical secondary agitator blades 8. After the servo torque motor 6 starts and runs a complete stirring process as required, the external controller simultaneously opens the inlet and outlet valves to continuously supply material while maintaining the liquid level in the vessel. The external controller continuously receives signals from the liquid level sensor 14 and simultaneously regulates the electrically controlled slurry inlet valve 11 and the electrically controlled slurry supply valve 13. The servo feed pump 27 is activated after a delay of 1-2 seconds, thereby achieving a dynamic balance continuous production mode.

[0031] The foregoing has shown and described the main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stirring device for dispersing special fibers, characterized in that: It includes a conical-bottomed round-corner kettle (1), which is divided into a conical feeding area (2) and a cylindrical stirring area (3). A screen (4) is provided between the conical feeding area (2) and the cylindrical stirring area (3). A stirring bearing seat (5) is fixedly installed on the screen (4). The center of the upper end face of the conical-bottomed round-corner kettle (1) is fixedly installed with a servo torque motor (6). The output shaft of the servo torque motor (6) passes through the conical-bottomed round-corner kettle (1) and is connected to the upper end of a stirring shaft (7) through a coupling. The lower end of the stirring shaft (7) is rotatably connected to the stirring bearing seat (5). A plurality of hemispherical secondary stirring blades (8) are fixedly installed in the upper middle part of the stirring shaft (7). The plurality of hemispherical secondary stirring blades (8) are evenly distributed in a circular shape with the stirring shaft (7) as the center. A plurality of "V"-shaped bottom stirring blades (9) are fixedly installed in the lower part of the stirring shaft (7). The plurality of "V"-shaped bottom stirring blades (9) are evenly distributed in a circular shape with the stirring shaft (7) as the center. One end of a slurry inlet pipe (10) is connected to the slurry inlet of the conical feeding area (2). The other end of the slurry inlet pipe (10) is fixedly connected to a servo feeding pump (27). An electronically controlled slurry inlet valve (11) is provided on the slurry inlet pipe (10). A slurry supply pipe (12) is fixedly connected to the lower part of the side wall of the cylindrical stirring area (3). The slurry supply pipe (12) is communicated with the outside. An electronically controlled slurry supply valve (13) is provided on the slurry supply pipe (12). A liquid level sensor (14) is provided on the side wall of the conical-bottomed round-corner kettle (1) to detect the height of the slurry inside the conical-bottomed round-corner kettle (1). The "V"-shaped bottom stirring blade (9) includes a main stirring blade (15) and a trapezoidal groove comb-shaped secondary blade (16). The main stirring blade (15) and the trapezoidal groove comb-shaped secondary blade (16) are set as an integral structure. The main stirring blade (15) is divided into an upper folding surface (17) and a lower folding surface (18). The included angle γ between the upper folding surface (17) and the trapezoidal groove comb-shaped secondary blade (16) is 30° - 90°. The included angle β between the upper folding surface (17) and the lower folding surface (18) is 9° - 175°. A plurality of rows of first gourd-shaped through holes (in) are opened in the lower part of the upper folding surface (17), and multiple first gourd-shaped through holes (19) in each row are arranged evenly. A plurality of rows of second gourd-shaped through holes (20) are arranged in the middle of the lower folding surface (18), and multiple second gourd-shaped through holes (20) in each row are arranged evenly. The side edge of the "V"-shaped bottom stirring blade (9) coincides with the edge of the screen (4). The side edge of the main stirring blade (15) is an "S"-shaped transition edge. The trapezoidal groove comb-shaped secondary blade (16) is fixedly installed at the lower end of the upper folding surface (17). The trapezoidal groove comb-shaped secondary blade (16) includes a plurality of trapezoidal bodies (21). The plurality of trapezoidal bodies (21) are uniformly arranged and fixed on the upper folding surface (17). An isosceles trapezoidal groove is formed between two adjacent trapezoidal bodies (21). The bottom surface of the isosceles trapezoidal groove faces the lower folding surface (18), and the lower surface of the trapezoidal groove comb-shaped secondary blade (16) and the lower surface of the lower folding surface (18) are arranged on the same plane. The slurry supply pipe (12) is arranged between the "V"-shaped bottom stirring blade (9) and the hemispherical secondary stirring blade (8). The slurry supply pipe (12) is set up in this area. The slurry meeting the process requirements will continuously enter the next process under the action of gravity or the next-stage slurry supply pump.

2. The stirring device for dispersing special fibers according to claim 1, characterized in that: The hemispherical secondary stirring blade (8) is installed at 2 / 3 - 4 / 5 of the total height from the bottom of the stirring shaft (7). The inclination angle of the hemispherical secondary stirring blade (8) is 30° - 75°. A plurality of rows of No. 3 gourd-shaped through holes (28) are evenly distributed on the hemispherical secondary stirring blade (8), and a plurality of No. 3 gourd-shaped through holes (28) in each row are evenly arranged.

3. The stirring device for dispersing special fibers according to claim 1, characterized in that: The stirring bearing seat (5) includes a base cup (22). A ball (23) is arranged inside the base cup (22). The bottom of the stirring shaft (7) is set as a conical body (24). An arc-shaped groove (25) is opened at the bottom of the conical body (24). The arc-shaped groove (25) corresponds to the ball (23). A conical sealing sleeve (26) is arranged between the base cup (22) and the stirring shaft (7).

4. The stirring device for dispersing special fibers according to claim 1, characterized in that: The distance between the lower surface of the "V"-shaped bottom stirring blade (9) and the screen (4) is 2 mm - 10 mm.

5. The stirring device for dispersing special fibers according to claim 2, characterized in that: For the No. 1 gourd-shaped through hole (19), the No. 2 gourd-shaped through hole (20) and the No. 3 gourd-shaped through hole (28), the ratio of the arc length L1 of the inner large circle cross-section to the arc length L2 of the inner small circle cross-section is K1, and 1.2 ≤ K1 ≤ 4. The ratio of the diameter R1 of the inlet small hole to the diameter R2 of the outlet large hole of the No. 1 gourd-shaped through hole (19), the No. 2 gourd-shaped through hole (20) and the No. 3 gourd-shaped through hole (28) is K2, and 0.2 ≤ K2 ≤ 0.

75.

6. The stirring device for dispersing special fibers according to claim 1, characterized in that: The servo feeding pump (27), the electric control slurry supply valve (13), the electric control slurry inlet valve (11) and the liquid level sensor (14) are all connected to an external controller. The controller controls the opening and closing of the electric control slurry supply valve (13) and the electric control slurry inlet valve (11) by receiving the signal of the liquid level sensor (14).

7. A method of using a stirring device for dispersing special fibers according to any one of claims 2-6, characterized in that: Open the electric control slurry inlet valve (11) and close the electric control slurry supply valve (13) at the same time. The servo feeding pump (27) transports the slurry to be processed through the slurry inlet pipe (10) into the conical round-corner kettle. When the liquid level sensor (14) detects that the slurry inlet height reaches the preset position, the servo feeding pump (27) and the electric control slurry inlet valve (11) are closed. While the slurry to be processed enters the conical round-corner kettle, start the servo torque motor (6) to drive the hemispherical secondary stirring blade (8) and the "in" shaped bottom stirring blade (9) to rotate. When the stirring speed reaches the preset value, continuous stirring is carried out. After the servo torque motor (6) starts and runs a complete stirring process as required, on the premise of maintaining the liquid level in the kettle, the external controller synchronously opens the electric control slurry inlet valve (11) and the electric control slurry supply valve (13) for continuous feeding, and delays for 1 - 2 s to start the servo feeding pump (27). The external controller continuously receives the signal from the liquid level sensor (14) and simultaneously regulates the electric control slurry inlet valve (11) and the electric control slurry supply valve (13), so as to achieve a dynamic balance continuous production mode.

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