Fiber slurry dispersing device

Abstract

The utility model discloses a fiber slurry dispersing device, which comprises a tank body, a dispersing device and a driving device, wherein the tank body is used for accommodating fiber slurry; the upper cutter structure is rotatably arranged in the groove body; the lower cutter structure is rotatably arranged in the groove body and is positioned below the upper cutter structure; the turbulent flow structure is installed on the side wall of the groove body and located around the upper cutter structure and the lower cutter structure; wherein the rotating speed of the upper cutter structure is higher than that of the lower cutter structure, and the fiber pulp can be pushed to flow upwards along the side wall of the groove body under the rotation of the lower cutter structure and flow towards the lower cutter structure on the inner side under the disturbance of the turbulent flow structure. According to the utility model, the fiber slurry can form good circulation in the tank body by utilizing the lower cutter structure and the disturbance structure, so that fibers in the fiber slurry are dissociated and uniformly dispersed through continuous collision, scattering and friction of the upper cutter structure, and impurities attached to the fibers are stripped and broken at the same time.

Description

Technical Field

[0001] This utility model relates to the field of dispersion equipment technology, and in particular, to a fiber slurry dispersion device. Background Technology

[0002] In the manufacturing process of banknote paper, Xuan paper, etc., it is necessary to disperse the fiber pulp. The current pulp dispersion equipment mainly includes: laboratory fiber decomposer, hydraulic pulper, high frequency decomposer, wall-breaking machine and industrial wall-breaking machine, etc.

[0003] The laboratory fiber descrambler mainly uses an impeller rotor to rotate within the tank, causing the pulp to rotate within the tank. A baffle in the tank obstructs the rotation of the pulp flow, creating a turbulent circulation that both rotates and tumbles. This fully utilizes the combined effects of mechanical friction and kneading to descramble the pulp fibers. With a capacity of 3L, it can process pulp with a concentration of ≤2.5% at 3000 rpm. However, the processing capacity of this instrument is relatively small and does not meet industrial requirements.

[0004] The working principle of hydraulic pulpers and high-frequency demultiplexers is that the blades impact the wetted pulp clumps or fiber bundles in contact with them. Simultaneously, the blades on the impeller generate a strong vortex, producing a hydraulic shearing effect that causes the fiber materials to rub against each other, ultimately breaking down the material. The impeller rotates at 500-1400 rpm. This type of device can demultiplex short fiber pulps such as straw pulp and wood pulp. However, due to the longer fiber length and greater toughness of bast fiber pulps, this type of equipment is not very effective at dispersing bast fiber pulps.

[0005] High-speed blenders and industrial high-speed blenders are small dispersing devices. Their working principle is to use an ultra-high-speed motor to drive stainless steel blades to cut the slurry at ultra-high speed in the tank. This causes the fibers to be broken down by cutting, friction, and kneading, which can fully disperse the bast fiber slurry and remove and crush impurities attached to the slurry fibers. However, their production capacity is too low to meet the needs of large-scale industrial production. Utility Model Content

[0006] The purpose of this invention is to provide a fiber slurry dispersion device to solve the technical problem that current slurry dispersion equipment cannot simultaneously meet the requirements of optimal dispersion effect and industrialization.

[0007] The above-mentioned objectives of this utility model can be achieved by the following technical solutions:

[0008] This utility model provides a fiber slurry dispersion device, comprising: a tank for containing fiber slurry; an upper cutter structure rotatably disposed within the tank; a lower cutter structure rotatably disposed within the tank and located below the upper cutter structure; and a turbulence-inducing structure installed on the side wall of the tank and located around the upper and lower cutter structures; wherein the rotational speed of the upper cutter structure is higher than that of the lower cutter structure, and the fiber slurry can be pushed upward along the side wall of the tank by the rotation of the lower cutter structure and flow towards the lower cutter structure on the inner side under the disturbance of the turbulence-inducing structure.

[0009] In this embodiment of the invention, the rotational speed of the upper tool structure is greater than 1400 r / min, and the rotational speed of the lower tool structure is less than 400 r / min.

[0010] In the embodiments of this utility model, the fiber slurry dispersion device can successively form a first operating state and a second operating state; wherein, in the first operating state, the lower cutter structure is in a rotating state and the upper cutter structure is in a stationary state; in the second operating state, both the upper cutter structure and the lower cutter structure are in a rotating state.

[0011] In this embodiment of the present invention, the upper cutting tool structure is rotatably disposed in the groove via the first rotating shaft, the first rotating shaft passing through the bottom wall of the groove, and the lower cutting tool structure is rotatably disposed in the groove via the second rotating shaft, the second rotating shaft passing through the bottom wall of the groove and sleeved outside the first rotating shaft.

[0012] In an embodiment of this utility model, the upper tool structure includes multiple upper tools, which are arranged at intervals along the axial direction of the first rotating shaft.

[0013] In this embodiment of the invention, the upper cutting tool is a straight cutting tool arranged radially along the first rotating shaft.

[0014] In an embodiment of this utility model, the lower cutter structure includes multiple arc-shaped blades, which are arranged at intervals along the circumference of the second rotating axis.

[0015] In an embodiment of this utility model, the fiber slurry dispersion device further includes a pneumatic sealing structure, which is connected to the shaft gap space between the first rotating shaft and the second rotating shaft. The pneumatic sealing structure is used to introduce gas into the shaft gap space to form a pneumatic sealing cavity.

[0016] In an embodiment of this utility model, the fiber slurry dispersion device further includes a first drive motor and a second drive motor; the output end of the first drive motor is connected to the first rotating shaft, and the first rotating shaft drives the upper cutter structure to rotate under the drive of the first drive motor; the output end of the second drive motor is connected to the second rotating shaft, and the second rotating shaft drives the lower cutter structure to rotate under the drive of the second drive motor.

[0017] In an embodiment of this utility model, the turbulence structure includes a plurality of turbulence ridges, which are arranged at intervals along the circumference of the groove. The turbulence ridges extend upward from their bottom end to their top end along the side wall of the groove, and the top end of the turbulence ridge is higher than the top end of the upper cutter structure.

[0018] In this embodiment of the utility model, the side wall of the tank has a flow guide cone surface, which is gradually widened from its bottom end to its top end, and the bottom end of the flow guide cone surface is connected to the bottom wall of the tank, while the top end of the flow guide cone surface is higher than the bottom end of the upper cutter structure.

[0019] The features and advantages of this utility model are:

[0020] The fiber slurry device of this invention allows the fiber slurry to be initially dispersed by a lower cutter structure with a low rotation speed. The fiber slurry is then pushed upward along the side wall by the rotation of the lower cutter structure. With the agitation of the turbulence structure, the fiber slurry flows towards the upper cutter structure on the inner side, where it is further dispersed by the upper cutter structure with a higher rotation speed. As a result, the fiber slurry forms a good circulation in the tank. Through continuous collision, dispersal, and friction by the upper cutter structure, the fibers in the fiber slurry are dissociated and evenly dispersed, while impurities attached to the fibers are peeled off and broken. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the fiber slurry dispersion device in this utility model.

[0023] Figure 2 This is a top view of the tank body in this utility model.

[0024] Figure 3 This is a schematic diagram of the upper cutting tool in one embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the upper cutting tool in another embodiment of the present invention.

[0026] In the picture:

[0027] 1. Tank body; 11. Loading and sampling port; 12. Guide cone surface;

[0028] 2. Turbation structure; 21. Turbation ridge; 3. Upper cutter structure; 31. Upper cutter; 31'. Straight flat cutter; 31''. Straight toothed cutter; 32. Cutter tooth; 4. Lower cutter structure; 41. Arc-shaped blade; 5. First rotating shaft; 6. Second rotating shaft; 7. Pneumatic sealing structure; 8. First drive motor; 9. Second drive motor; 10. Column. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figure 1 As shown, this utility model provides a fiber slurry dispersion device, comprising: a tank 1 for containing fiber slurry; an upper cutter structure 3 rotatably disposed within the tank 1; a lower cutter structure 4 rotatably disposed within the tank 1 and located below the upper cutter structure 3; and a turbulence structure 2 installed on the side wall of the tank 1 and located around the upper cutter structure 3 and the lower cutter structure 4; wherein, the rotational speed of the upper cutter structure 3 is higher than that of the lower cutter structure 4, and the fiber slurry can be pushed upward along the side wall under the rotation of the lower cutter structure 4 and flow towards the lower cutter structure 4 on the inner side under the disturbance of the turbulence structure 2.

[0031] In this invention, the fiber slurry device allows the fiber slurry to be initially dispersed by the lower cutter structure 4, which rotates at a relatively low speed. The fiber slurry is then pushed upward along the side wall by the rotation of the lower cutter structure 4. Combined with the disturbance of the turbulence structure 2, the fiber slurry flows towards the upper cutter structure 3 on the inner side, where it is further dispersed by the upper cutter structure 3, which rotates at a higher speed. As a result, the fiber slurry forms a good circulation within the tank 1. Through continuous collision, dispersal, and friction by the upper cutter structure 3, the fibers in the fiber slurry are dissociated and evenly dispersed, while impurities attached to the fibers are peeled off and broken.

[0032] Specifically, such as Figure 1As shown, the top wall of the tank 1 is provided with a loading and sampling port 11 for feeding and sampling. The shape and size of the tank 1 are not specifically limited and can be designed according to needs. In this embodiment, the volume of the tank 1 is 1m³. 3 Its effective volume is 0.6 m³. 3 That is, the liquid in tank 1 should not exceed 0.6 m³. 3 To avoid excessive liquid and reduced dispersion, a discharge port is provided on the bottom wall of the tank 1, and a discharge valve is installed at the discharge port to control the discharge. The tank 1 is supported by multiple columns 10.

[0033] like Figure 1 As shown, in order to improve the dispersion effect of fiber pulp, in the embodiment of this utility model, the fiber pulp dispersion device can successively form a first operating state and a second operating state; wherein, in the first operating state, the lower cutter structure 4 is in a rotating state and the upper cutter structure 3 is in a stationary state; in the second operating state, both the upper cutter structure 3 and the lower cutter structure 4 are in a rotating state. By first rotating the lower cutter structure 4, it is ensured that the fiber pulp can be initially dispersed by the lower cutter structure 4 in the first operating state. Then, the rotation of the upper cutter structure 3 is coordinated with the rotation of the lower cutter structure 4, thereby ensuring that the fiber pulp can be repeatedly collided, dispersed, and rubbed by the upper cutter structure 3 during the circulation process in the tank 1 in the second operating state, so as to be fully dispersed and impurities on the fiber are peeled off and broken.

[0034] Specifically, the upper cutter structure 3 is rotatably mounted inside the tank 1 via a first rotating shaft 5, which passes through the bottom wall of the tank 1. The lower cutter structure 4 is rotatably mounted inside the tank 1 via a second rotating shaft 6, which passes through the bottom wall of the tank 1 and is fitted over the first rotating shaft 5. This allows the rotation of the upper cutter structure 3 and the lower cutter structure 4 to be controlled by controlling the rotation of the first rotating shaft 5 and the second rotating shaft 6 respectively. Furthermore, the rotation centers of the lower cutter structure 4 and the upper cutter structure 3 are located on the same axis, which is beneficial for the circulation of the fiber slurry within the tank 1. The fiber slurry dispersion device also includes a first drive motor 8 and a second drive motor 9. The output end of the first drive motor 8 is connected to the first rotating shaft 5, which drives the upper cutter structure 3 to rotate under the drive of the first drive motor 8. The output end of the second drive motor 9 is connected to the second rotating shaft 6, which drives the lower cutter structure 4 to rotate under the drive of the second drive motor 9. In this embodiment, the power of the first drive motor is 45KW, and the power of the second drive motor is 11KW.

[0035] Furthermore, to prevent impurities from entering the shaft gap space between the first rotating shaft 5 and the second rotating shaft 6, the fiber slurry dispersion device also includes a pneumatic sealing structure 7. The pneumatic sealing structure 7 is connected to the shaft gap space between the first rotating shaft 5 and the second rotating shaft 6, and is used to introduce gas into the shaft gap space to form a pneumatic sealing cavity. Specifically, two rotating shaft dynamic sealing structures can be provided between the second rotating shaft 6 and the first rotating shaft 5. One of the rotating shaft dynamic sealing structures has an air inlet channel connected to the shaft gap space. The pneumatic sealing structure outputs compressed air, which enters the shaft gap space from the air inlet channel, thereby achieving a pneumatic sealing cavity.

[0036] like Figure 1 As shown, the operation process of a specific embodiment of this utility model is as follows:

[0037] S1. Check for any abnormalities in the fiber slurry dispersion device, including whether the rotation of the upper cutter structure 3 and the lower cutter structure 4 is correct.

[0038] S2. Water can be added to the tank 1 to the preset liquid level through the loading and sampling port 11;

[0039] S3. Set the frequency of the second drive motor 9, and then start the second drive motor 9 so that the lower tool structure 4 starts to rotate;

[0040] S4. After the second drive motor 9 runs stably, the first operating state is formed. The fiber slurry is slowly put into the tank 1 from the loading sampling port 11, so that the fiber slurry is initially dispersed by the lower cutter structure 4. The fiber slurry is diluted by the water in the tank 1 to the required dispersion concentration.

[0041] S5. After the second drive motor 9 has been running stably for a preset time, the first drive motor 8 is started at a set frequency, causing the upper cutter structure 3 to start rotating, thereby forming a second running state and continuing for a preset dispersion time, so that the fiber slurry forms a circulation in the tank 1 under the rotation of the lower cutter structure 4 and the disturbance of the turbulence structure 2, thereby being fully dispersed under the repeated collision of the lower cutter structure 4; wherein the preset time for the second drive motor 9 to run stably is preferably at least five minutes;

[0042] S6. During operation, a portion of the liquid is taken out from the sampling port 11 to observe the dispersion effect;

[0043] S7. When the dispersion effect meets the requirements, the machine is stopped, and the first drive motor 8 and the second drive motor 9 are turned off in sequence.

[0044] S8. Then open the discharge valve to discharge the fiber pulp from tank 1 and collect the discharged fiber pulp.

[0045] S9, Cleaning tank 1.

[0046] like Figure 1 and Figure 2 As shown, in order to improve the circulation of fiber slurry within the tank 1, in this embodiment of the invention, the turbulence structure 2 includes multiple turbulence ridges 21. These ridges are arranged at intervals along the circumference of the tank 1, extending upwards from their bottom to their top along the sidewall of the tank 1, with the top of each ridge higher than the top of the upper cutter structure 3. By providing multiple turbulence ridges 21, and ensuring that the tops of the ridges are higher than the top of the upper cutter structure 3, the turbulence area of ​​the turbulence structure 2 can surround the rotational dispersion area of ​​the upper cutter structure 3, allowing the fiber slurry to flow into the rotational dispersion area of ​​the upper cutter structure 3 under the turbulence of the turbulence structure 2.

[0047] Specifically, the turbulence ridge 21 is generally a raised elongated structure. The cross-sectional shape of the turbulence ridge 21 can be triangular as in this embodiment, or it can be rectangular, trapezoidal, semi-circular, or other shapes. The number of turbulence ridges 21 can be four as in this embodiment, or it can be three, five, six, or other numbers. In addition, the sidewall of the tank 1 has a guide cone surface 12, which is gradually widened from its bottom end to its top end, and the bottom end of the guide cone surface 12 is connected to the bottom wall of the tank 1. The top end of the guide cone surface 12 is higher than the bottom end of the upper cutter structure 3, and the bottom end of the turbulence ridge 21 extends along the guide cone surface 12 to the bottom wall of the tank 1. By setting the guide cone surface 12, the fiber slurry in the rotating pushing area of ​​the lower cutter structure 4 can flow upward along the guide cone surface 12, and then, under the disturbance of multiple turbulence ridges 21, it can flow more quickly to the rotating dispersion area of ​​the upper cutter structure 3.

[0048] In addition, such as Figure 1 As shown, in order to expand the effective area of ​​the upper cutter structure 3 and improve its dispersion effect, the upper cutter structure 3 includes multiple upper cutters 31, which are arranged at intervals along the axial direction of the first rotating shaft 5. Specifically, the upper cutters 31 are straight cutters arranged radially along the first rotating shaft 5. Each straight cutter has two straight blades arranged opposite each other. In this embodiment, the diameter of the groove 1 is 1200 mm, and the diameter of the upper cutter 31 is 450 mm.

[0049] like Figure 2As shown, to ensure that the fiber slurry can form a good and stable circulation under the rotation of the lower cutter structure 4, the lower cutter structure 4 includes multiple arc-shaped blades 41, which are arranged at intervals along the circumference of the second rotating shaft 6. Specifically, the arc-shaped blades 41 are generally crescent-shaped. The lower cutter structure 4 may include only one lower cutter, which is provided with multiple arc-shaped blades 41. The lower cutter structure 4 may also include multiple lower cutters, each of which may be provided with only one or more arc-shaped blades 41, for example, each lower cutter is provided with two arc-shaped blades 41, so that the lower cutter is generally S-shaped, and the multiple lower cutters are arranged alternately, so that the multiple arc-shaped blades 41 are arranged at intervals along the circumference of the second rotating shaft 6. In this embodiment, the diameter of the lower cutter is 600 mm.

[0050] To further optimize the dispersion effect of the fiber slurry dispersion device of this invention, the following experiments were conducted:

[0051] Experiment 1: Determination of the rotational speed of the lower cutter structure 4. By changing only the rotational speed of the lower cutter structure 4, the circulation flow of the fiber slurry in the tank 1 was observed. The results are as follows:

[0052]

[0053] Therefore, the rotational speed of the lower cutter structure 4 should be less than 400 r / min, and preferably 300 r / min, so that the fiber slurry can circulate more efficiently and at a faster speed.

[0054] Experiment 2: Determination of dispersion time (i.e., duration of the second operating state). By changing only the dispersion time, the dispersion effect of the fiber slurry was observed. The experimental results are as follows:

[0055]

[0056] Therefore, a dispersion time of 30 minutes is significantly better than that of 20 minutes. However, the dispersion effect of 40 minutes over 30 minutes is not significant. Considering both time and energy consumption, a dispersion time of 30 minutes is the preferred option. It should be noted, however, that the dispersion time can be appropriately reduced or extended for bast fiber slurries with different properties and cleanliness levels, depending on the actual dispersion conditions. Generally, the dispersion time is between 30 and 50 minutes.

[0057] Experiment 3: Determination of Dispersion Concentration. This experiment observed the dispersion effect of the fiber pulp by changing only its dispersion concentration. The results are as follows:

[0058]

[0059] Therefore, a dispersion concentration of 6% is slightly better than that of 3%. The higher the concentration, the greater the friction between fibers, which is more conducive to dispersing fibers and removing impurities attached to them. However, if the dispersion concentration is too high, it will cause the equipment to operate under overload and even damage the equipment. Therefore, the dispersion concentration should not exceed 6%. Generally, the preferred dispersion concentration range is 3% to 6%. Of course, the specific dispersion concentration can be selected according to other factors such as the properties of the pulp, quality requirements, and production capacity requirements.

[0060] Experiment 4: Determination of the rotational speed of the upper cutter structure 3. By changing only the rotational speed of the upper cutter structure 3, the dispersion effect of the fiber slurry was observed. The experimental results are as follows:

[0061]

[0062] Therefore, it can be seen that the dispersion effect of the upper tool structure 3 at a rotation speed of 2800 r / min is significantly better than that at a rotation speed of 1400 r / min. To ensure a better dispersion effect, the rotation speed of the upper tool structure 3 should be greater than 1400 r / min, and the higher the rotation speed, the better. Therefore, in this embodiment, the rotation speed of the upper tool structure 3 is the highest rotation speed that it can achieve under the drive of the second drive motor 9, which is 2800 r / min.

[0063] Experiment 5: Optimization experiment of the cutter shape of the upper cutter 31 in the upper cutter structure 3. The number of upper cutters 31 in the upper cutter structure 3 was controlled to be the same, while the cutter shape was optimized by selecting different cutters such as... Figure 3 The straight flat knife 31' shown (i.e., a straight knife with a flat cutting edge) and as shown Figure 4 The straight toothed cutter 31'' (i.e., a straight cutter with multiple teeth 32 on its cutting edge) was used to observe the dispersion effect on the fiber slurry. The test results are as follows:

[0064]

[0065] Therefore, it can be seen that when the upper blade 31 uses a straight toothed blade 31'', the dispersion effect is slightly better than that of using a straight flat blade 31'. The surface area of ​​the cutting edge of the straight toothed blade 31'' is larger than that of the straight flat blade 31'', and the probability of collision with the fiber is greater, thus improving its dispersion effect.

[0066] The above descriptions are merely a few embodiments of this utility model. Those skilled in the art can make various modifications or variations to the embodiments of this utility model based on the content disclosed in the application documents without departing from the spirit and scope of this utility model.

Claims

1. A fiber slurry dispersion device, characterized in that, include: The tank is used to hold the fiber pulp. The upper cutting tool structure is rotatably mounted in the groove; The lower cutter structure is rotatably disposed within the groove and located below the upper cutter structure; A flow-disrupting structure is installed on the side wall of the tank and located around the upper and lower cutter structures; The upper cutter structure rotates at a higher speed than the lower cutter structure. The fiber slurry is pushed upward along the side wall of the tank by the rotation of the lower cutter structure and flows towards the lower cutter structure inside the tank under the disturbance of the turbulence structure.

2. The fiber slurry dispersion device as described in claim 1, characterized in that, The upper tool structure has a rotational speed greater than 1400 r / min, and the lower tool structure has a rotational speed less than 400 r / min.

3. The fiber slurry dispersion device as described in claim 1, characterized in that, The fiber slurry dispersion device can successively form a first operating state and a second operating state; wherein, in the first operating state, the lower cutter structure is in a rotating state and the upper cutter structure is in a stationary state; in the second operating state, both the upper cutter structure and the lower cutter structure are in a rotating state.

4. The fiber slurry dispersion device as described in claim 1, characterized in that, The upper cutting tool structure is rotatably mounted in the groove via a first rotating shaft, which passes through the bottom wall of the groove. The lower cutting tool structure is rotatably mounted in the groove via a second rotating shaft, which passes through the bottom wall of the groove and is sleeved outside the first rotating shaft.

5. The fiber slurry dispersion device as described in claim 4, characterized in that, The upper tool structure includes multiple upper tools, which are arranged at intervals along the axial direction of the first rotating shaft; the upper tools are straight tools arranged radially along the first rotating shaft.

6. The fiber slurry dispersion device as described in claim 4, characterized in that, The lower cutting tool structure includes multiple arc-shaped blades, which are arranged at circumferential intervals along the second rotating axis.

7. The fiber slurry dispersion device as described in claim 4, characterized in that, The fiber slurry dispersion device further includes a first drive motor and a second drive motor; the output end of the first drive motor is connected to the first rotating shaft, and the first rotating shaft drives the upper cutter structure to rotate under the drive of the first drive motor. The output end of the second drive motor is connected to the second rotating shaft, and the second rotating shaft drives the lower tool structure to rotate under the drive of the second drive motor.

8. The fiber slurry dispersion device as described in claim 4, characterized in that, The fiber slurry dispersion device further includes a pneumatic sealing structure, which is connected to the shaft gap space between the first rotating shaft and the second rotating shaft. The pneumatic sealing structure is used to introduce gas into the shaft gap space to form a pneumatic sealing cavity.

9. The fiber slurry dispersion device as described in claim 1, characterized in that, The turbulence structure includes multiple turbulence ridges, which are arranged at intervals along the circumference of the groove. The turbulence ridges extend upward from their bottom end to their top end along the side wall of the groove, and the top end of the turbulence ridge is higher than the top end of the upper cutter structure.

10. The fiber slurry dispersion device as described in claim 1, characterized in that, The sidewall of the tank has a flow guide cone surface, which gradually expands from its bottom end to its top end. The bottom end of the flow guide cone surface is connected to the bottom wall of the tank, and the top end of the flow guide cone surface is higher than the bottom end of the upper tool structure.

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