Low consistency pulper multi-feed mixing system

Abstract

The utility model relates to a pulping machine technical field, and disclose a kind of low-concentration pulping machine multi-raw material mixing system, including pulping machine tank body, the pulping machine tank cover being set to pulping machine tank body upper end, rotation is installed in the stirring shaft of pulping machine tank body inner chamber center and the drive motor of driving stirring shaft rotation, multiple stepped variable-diameter stirring vane groups are installed on the stirring shaft and distribute along its axial direction;Each the stepped variable-diameter stirring vane group includes multiple blades that are evenly distributed along the outer wall of stirring shaft and extend radially, and the radial extension length of multiple blades in the same group is stepped increase along the rotation direction of stirring shaft.The utility model is designed through stepped variable-diameter stirring vane group, breaks the regular flow field, so that stirring intensity is continuously changed in radial direction, forms stirring area with strong and weak changes, produces more disorderly turbulent flow, effectively prevents the stratification phenomenon caused by density and fiber length difference of different raw materials, significantly improves mixing uniformity.

Description

Technical Field

[0001] This utility model relates to the field of pulping machinery technology, specifically a multi-raw material mixing system for a low-concentration pulper. Background Technology

[0002] Low-consistency pulpers are key equipment in the pulp and paper industry for breaking down raw materials such as pulpboard and waste paper. In actual production, it is often necessary to mix and break down various types and properties of raw materials (such as wood pulp, straw pulp, and waste paper). However, existing mixing devices generally suffer from problems such as uneven mixing, easy fiber entanglement, and low efficiency, as detailed below: 1. Simple rotational stirring will generate regular eddies, causing raw materials of different densities and fiber lengths to stratify under the action of centrifugal force. Heavier or longer fibers tend to move to the periphery, while lighter short fibers concentrate in the center, resulting in uneven mixing. 2. Long fiber raw materials are very easy to get tangled on the main shaft and stationary stirring blades, forming "cotton-like" clumps. This not only reduces mixing efficiency but also significantly increases the motor load, posing a risk of burning out the motor. In particular, for long fiber raw materials, "fiber clumps" or "entanglements" are easily formed near the stirring shaft, which seriously affects pulping efficiency and quality, and may even cause the equipment to stop due to excessive load.

[0003] Therefore, there is an urgent need for a low-concentration pulper multi-raw material mixing system that can effectively solve the above problems, achieve efficient and uniform mixing, and prevent fiber entanglement. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a multi-raw material mixing system for a low-concentration pulper.

[0005] This utility model proposes a multi-raw material mixing system for a low-concentration pulper, comprising a pulper tank, a pulper tank cover disposed at the upper end of the pulper tank, a stirring shaft rotatably mounted at the center of the inner cavity of the pulper tank, and a drive motor for driving the stirring shaft to rotate. The stirring shaft is equipped with multiple stepped variable-diameter stirring blade groups distributed along its axial direction. Each stepped variable-diameter stirring blade group includes multiple blades evenly distributed circumferentially along the outer wall of the stirring shaft and extending radially. The radial extension length of the multiple blades within the same group increases in a stepped manner along the rotation direction of the stirring shaft. Multiple dispersing rod groups are evenly distributed along the height direction on the inner wall of the pulper tank. The dispersing rod groups are axially staggered from the stepped variable-diameter stirring blade groups. Each dispersing rod group includes multiple dispersing rod units evenly distributed circumferentially along the inner wall of the pulper tank. Each dispersing rod unit includes multiple elastic dispersing rods arranged side-by-side and extending radially toward the center of the tank. To address the problems of "raw material stratification and fiber entanglement" in traditional pulpers, this system uses a combination of "stepped blades and elastic dispersing rods" to break the deadlock. When the stepped variable diameter mixing blades rotate with the mixing shaft, they break the regular vortex and form radial turbulence with alternating strong and weak currents, thus preventing wood pulp, waste paper and other raw materials from stratifying due to density differences. The staggered distribution of the dispersing rods and blades allows the elastic dispersing rods to vibrate when impacted by the pulp, breaking up fiber clumps rather than cutting them. This avoids excessive motor load caused by the fibers getting tangled around the mixing shaft. This design is suitable for mixing multiple raw materials, significantly improving pulping efficiency and meeting the needs of large-scale production in the pulp and paper industry.

[0006] As a further optimization of this utility model, a turbulence array is also provided on the inner wall of the pulper tank, the turbulence array including multiple turbulence protrusions distributed between adjacent dispersion rod units; The turbulence array further disrupts the laminar flow near the tank wall, causing irregular eddies in the slurry and preventing raw materials from depositing on the tank wall. The bumps, elastic dispersing rods, and blade groups form a three-dimensional turbulence system, ensuring that different raw materials are fully mixed in both horizontal and vertical directions. It is especially suitable for mixing lightweight short fibers and heavy long fibers, which helps to reduce the standard deviation of fiber distribution in the mixed slurry.

[0007] As a further optimization of this utility model, the turbulence protrusion is hemispherical or streamlined in shape, and has a smooth surface without sharp edges and corners to avoid scratching the fibers, reduce the fiber breakage rate, reduce the flow resistance of the slurry, reduce the energy consumption of the drive motor, and the smooth surface can also prevent the slurry from adhering, reduce the frequency of cleaning, and is suitable for the disintegration and mixing of high viscosity slurries.

[0008] As a further optimization of this utility model, an arc-shaped second fixing plate is installed on the inner wall of the pulper tank, and multiple turbulence protrusions are evenly distributed on the inner arc surface of the second fixing plate; The second fixing plate provides a stable mounting base for the protrusions, ensuring that the protrusions are evenly distributed around the circumference and avoiding tank deformation caused by direct welding. The fixing plate is connected by bolts, which facilitates the replacement of damaged protrusions later, helps to improve maintenance efficiency and extend the service life of the tank.

[0009] As a further optimization of this utility model, each of the dispersion rod units also includes a first fixing plate fixed to the inner wall of the pulper tank. The first fixing plate has a plurality of connecting holes arranged in parallel. The end of the elastic dispersion rod is inserted into the connecting hole and locked by fasteners. The connecting holes on the first fixed plate provide an adjustable installation position for the dispersing rod. Different lengths of elastic dispersing rods can be replaced according to the characteristics of the raw materials. Bolts are used as fasteners to ensure that the elastic dispersing rod is firmly fixed and to prevent loosening during high-speed rotation. This design makes the elastic dispersing rod easy to install and remove, and adapts to the crushing needs of different raw materials.

[0010] As a further optimization of this utility model, the elastic dispersing rod is an elastic metal rod, preferably made of spring steel, which has excellent deformation recovery ability. When impacted by slurry, it can produce a certain elastic deformation, quickly reset after shaking off the fiber clumps. At the same time, for hard objects such as small stones mixed in, the rod can bend to make way, avoiding cracking caused by rigid impact, reducing the failure rate, protecting the tank and stirring shaft, and extending the life of core components.

[0011] As a further optimization of this utility model, the lower end of the stirring shaft is also equipped with a crushing rotary cutter located at the bottom of the inner cavity of the pulper tank, and there is a gap between the crushing rotary cutter and the elastic dispersing rod. The rotating blades of the crusher pre-crush the lumpy raw materials such as waste paper balls deposited at the bottom of the tank, avoiding insufficient mixing of the raw materials at the bottom. The gap between the blades and the elastic dispersing rods ensures no collision, while forming a layered operation of "bottom crushing + middle stirring + upper mixing", which further improves the uniformity of the pulp.

[0012] As a further optimization of this utility model, the system also includes a base and a lifting mechanism; the pulper tank is installed on the base; the lifting mechanism includes a lift installed on the base and a cantilever connected to the movable end of the lift, the cantilever extending horizontally to above the pulper tank cover and being fixed to the pulper tank cover by a connecting rod; The base provides stable support for the tank, and the lift is a hydraulic lifting device that uses a cantilever to lift the tank cover, facilitating the addition of raw materials and maintenance of the tank interior.

[0013] As a further optimization of this utility model, the drive motor is disposed inside the base, and the lower end of the stirring shaft extends into the base and is connected to the output end of the drive motor through a coupling.

[0014] As a further optimization of this utility model, the bottom of the pulper tank is equipped with a discharge pipe with a valve, which can quickly control the discharge of pulp. The pipe diameter is adapted to the subsequent conveying pump to avoid pulp blockage and ensure that the pulp after pulping quickly enters the next process, thereby improving the overall production efficiency.

[0015] The low-concentration pulper multi-raw material mixing system proposed in this utility model has the following beneficial effects: (i) By designing a stepped variable diameter mixing blade assembly, the regular flow field is broken, and the mixing force changes continuously in the radial direction, forming a mixing zone with varying strength, generating more disordered turbulence, effectively preventing the stratification phenomenon caused by differences in density and fiber length of different raw materials, and significantly improving the mixing uniformity. (ii) The use of elastic metal dispersing rods allows the rods to deform and vibrate when impacted by the raw material flow, which can disperse and separate the fiber clusters, thereby untying the knots of fiber entanglement instead of cutting the fibers. This preserves the inherent fiber length of the raw material to the greatest extent, ensuring the strength and quality of the final pulp, while avoiding the problem of increased load caused by fiber entanglement on the main shaft and blades. (iii) The elastic dispersion bar can give way and buffer hard objects that are accidentally mixed in, avoid rigid impact, eliminate the risk of chipping of the cutting edge and jamming caused by using rigid fixed blades, and improve the reliability and service life of the equipment. (iv) The added turbulence protrusions can further disrupt the laminar flow near the tank wall, generating irregular vortices, which work together with the stirring blades and elastic dispersing rods to comprehensively improve the mixing effect.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the pulper tank of this utility model; Figure 3 This is a schematic diagram of the structure of the elastic dispersion rod of this utility model; Figure 4 This is a top view of the turbulence array of this utility model.

[0018] Figure descriptions: 1. Pulper tank cover; 2. Agitator shaft; 3. Pulper tank body; 4. First fixed plate; 5. Elastic dispersion rod; 6. Crushing rotary cutter; 7. Cantilever; 8. Stepped variable diameter agitator blade assembly; 9. Elevator; 10. Base; 11. Turbulence protrusion; 12. Second fixed plate. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0021] Please see Figures 1-4 A low-concentration pulper multi-raw material mixing system includes a pulper tank 3 and a pulper tank cover 1 with an opening at the upper end of the pulper tank 3, and the height of the pulper tank cover 1 is adjustable.

[0022] Specifically, such as Figure 1 and Figure 2 As shown, a stirring shaft 2 driven by a motor is rotatably installed at the center of the inner cavity of the pulper tank 3. Multiple stepped variable diameter stirring blade groups 8 are evenly distributed along the length of the stirring shaft 2. Each stepped variable diameter stirring blade group 8 includes multiple blades that are evenly distributed circumferentially along the outer wall of the stirring shaft 2 and extend radially. The radial extension length of each group of multiple blades increases in a stepwise manner along the rotation direction of the stirring shaft 2, so that the frontal area of ​​the outer blades of the stirring shaft 2 is not uniform, but gradually increases. This can break the regular flow field, make the stirring force continuously change radially, form a stirring zone with varying strength, generate more disordered turbulence, and thus improve the uniformity of stirring and mixing.

[0023] Specifically, such as Figure 2 and Figure 3 As shown, the inner wall of the pulper tank 3 is equipped with multiple dispersing rod groups evenly distributed along its height, and the gap between two adjacent dispersing rod groups corresponds to a stepped variable diameter stirring blade group 8, so that the multiple dispersing rod groups and the multiple stepped variable diameter stirring blade groups 8 are staggered. Each dispersing rod group includes multiple dispersing rod units evenly distributed along the circumference of the inner wall of the pulper tank 3. Each dispersing rod unit includes multiple elastic dispersing rods 5 arranged side by side. One end of the elastic dispersing rod 5 is fixed to the inner wall of the pulper tank 3, and the other end extends radially toward the center of the pulper tank 3. The elastic dispersing rod 5 is a high-strength elastic metal rod, preferably made of spring steel. When the raw material flow impacts the elastic dispersing rod 5, the rod undergoes elastic deformation and vibration, which can shake and separate the fiber clumps, thereby untying the knots of fiber entanglement instead of cutting the fibers themselves. Therefore, it can preserve the inherent fiber length of the raw material to the greatest extent, ensuring the strength and quality of the final pulp. Moreover, for hard objects that are accidentally mixed in, the elastic rod can be pushed aside to avoid hard impact. After the hard object passes, it returns to its original position by its own elasticity. This fundamentally eliminates the risk of blade chipping and material jamming caused by using rigid fixed blades, which is conducive to improving the reliability and life of the equipment. Furthermore, each dispersing rod unit also includes a first fixing plate 4 fixed to the inner wall of the pulper tank 3. The first fixing plate 4 has multiple connecting holes arranged side by side. The end of the elastic dispersing rod 5 is inserted into the connecting hole and locked by fasteners.

[0024] Specifically, such as Figure 2 and Figure 4 As shown, the inner wall of the pulper tank 3 is also equipped with a turbulence array. The turbulence array includes multiple turbulence protrusions 11 distributed between adjacent dispersing rod units. The turbulence protrusions 11 are hemispherical or streamlined and have smooth surfaces without sharp edges, which causes the slurry near the tank wall to generate irregular vortices, thereby improving the actual mixing effect. Furthermore, a second fixing plate 12 is installed on the inner wall of the pulper tank 3. The second fixing plate 12 is an arc-shaped plate, and multiple turbulence protrusions 11 are evenly distributed on the inner arc surface of the second fixing plate 12.

[0025] Specifically, the system also includes a base 10, with the pulper tank 3 installed on one side of the upper end face of the base 10. A lift 9 is installed on the other side of the upper end face of the base 10. The lift 9 is preferably a hydraulic lift, with its movable end extending vertically upward and equipped with a cantilever 7. The other end of the cantilever 7 extends horizontally to the top of the pulper tank cover 1 and is fixed to the upper end face of the pulper tank cover 1 by a connecting rod. The lift 9 drives the cantilever 7 to rise and fall, thereby driving the pulper tank cover 1 to rise and fall synchronously, so as to realize the opening and closing of the pulper tank cover 1. Furthermore, a crushing blade 6 is installed at the lower end of the stirring shaft 2, located at the lower end of the inner cavity of the pulper tank 3. There is a gap between the crushing blade 6 and the elastic dispersing rod 5. The crushing blade 6 is driven to rotate synchronously by the stirring shaft 2, which can improve the mixing effect of the slurry at the lower end of the inner cavity of the pulper tank 3. Furthermore, the motor is installed inside the base 10, and the lower end of the stirring shaft 2 extends into the base 10 and is connected to the output end of the motor through a coupling. The stirring shaft 2 and the bottom of the pulper tank 3 are dynamically sealed by a rotating seal to prevent pulp leakage. It should be noted that the bottom of the pulper tank 3 is also equipped with a discharge pipe with a valve to facilitate the discharge of pulp after the pulping operation is completed.

[0026] During operation, the drive motor drives the stirring shaft 2 and the stepped variable diameter stirring blade assembly 8 to rotate, generating complex turbulence. Fiber clumps in the slurry collide with the elastic dispersing rod 5 under the action of the flow field. The elastic dispersing rod 5 vibrates elastically and breaks them apart. The turbulence protrusion 11 further disturbs the flow field, together creating a highly complex and disordered three-dimensional turbulent flow field in the pulping tank. This allows different raw materials to be fully and uniformly mixed in both the horizontal and vertical directions, effectively solving the problems of uneven mixing and fiber entanglement.

[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A low-concentration pulper multi-raw material mixing system, comprising a pulper tank (3), a pulper tank cover (1) disposed at the upper end of the pulper tank (3), a stirring shaft (2) rotatably installed at the center of the inner cavity of the pulper tank (3), and a drive motor for driving the stirring shaft (2) to rotate, characterized in that: The stirring shaft (2) is equipped with multiple stepped variable diameter stirring blade groups (8) distributed along its axial direction. Each of the stepped variable diameter stirring blade groups (8) includes multiple blades that are evenly distributed circumferentially and extend radially along the outer wall of the stirring shaft (2). The radial extension length of the multiple blades in the same group increases in a stepped manner along the rotation direction of the stirring shaft (2). The inner wall of the pulper tank (3) is provided with a plurality of dispersing rod groups evenly distributed along its height direction, and the dispersing rod groups and the stepped variable diameter stirring blade group (8) are staggered in the axial direction. Each of the dispersion rod groups includes multiple dispersion rod units evenly distributed circumferentially along the inner wall of the pulper tank (3), and each dispersion rod unit includes multiple elastic dispersion rods (5) arranged side by side and extending radially toward the center of the tank.

2. The low-consistency pulper multi-raw material mixing system according to claim 1, characterized in that, The inner wall of the pulper tank (3) is also provided with a turbulence array, which includes multiple turbulence protrusions (11) distributed between adjacent dispersion rod units.

3. The low-consistency pulper multi-raw material mixing system according to claim 2, characterized in that, The turbulence bump (11) is hemispherical or streamlined in shape and has a smooth surface.

4. A low-consistency pulper multi-raw material mixing system according to claim 2 or 3, characterized in that, The inner wall of the pulper tank (3) is equipped with an arc-shaped second fixing plate (12), and multiple turbulence protrusions (11) are evenly distributed on the inner arc surface of the second fixing plate (12).

5. The low-consistency pulper multi-raw material mixing system according to claim 1, characterized in that, Each of the dispersion rod units also includes a first fixing plate (4) fixed to the inner wall of the pulper tank (3). The first fixing plate (4) has multiple connecting holes arranged side by side. The end of the elastic dispersion rod (5) is inserted into the connecting hole and locked by fasteners.

6. A low-consistency pulper multi-raw material mixing system according to claim 1 or 5, characterized in that, The elastic dispersion rod (5) is an elastic metal rod.

7. The low-consistency pulper multi-raw material mixing system according to claim 1, characterized in that, The lower end of the stirring shaft (2) is also equipped with a crushing blade (6) located at the bottom of the inner cavity of the pulper tank (3), and there is a gap between the crushing blade (6) and the elastic dispersing rod (5).

8. A low-consistency pulper multi-raw material mixing system according to claim 1, characterized in that, It also includes a base (10) and a lifting mechanism; The pulper tank (3) is mounted on the base (10); The lifting mechanism includes a lift (9) mounted on a base (10) and a cantilever (7) connected to the movable end of the lift (9). The cantilever (7) extends horizontally above the pulper tank cover (1) and is fixed to the pulper tank cover (1) by a connecting rod.

9. A low-consistency pulper multi-raw material mixing system according to claim 1, characterized in that, The drive motor is located inside the base (10), and the lower end of the stirring shaft (2) extends into the base (10) and is connected to the output end of the drive motor via a coupling.

10. A low-consistency pulper multi-raw material mixing system according to claim 1, characterized in that, The bottom of the pulper tank (3) is equipped with a discharge pipe with a valve.

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