A pulp precipitation stirring device and its stirring process

Abstract

The present application discloses a pulp precipitation stirring device and its stirring process. The hydraulic rod drives the extrusion plate to reciprocate up and down, so that the extrusion plate extrudes the slurry in the moving direction during the movement, prompting the slurry to pass through the inclined diversion holes through the extrusion plate and enter the space opposite to the moving direction of the extrusion plate. Since the diversion holes are inclined, the slurry passing through the diversion holes flows in the direction of the inclination of the diversion holes, so that the slurry undergoes reverse flow mixing during the intermittent passing through the diversion holes, and is separated and dispersed through the diversion holes, thereby performing efficient stirring operations.

Description

Technical Field

[0001] This application relates to the technical field of pulp preparation, and particularly relates to a pulp precipitation stirring device and its stirring process. Background Art

[0002] In the process of preparing paper products, it is necessary to stir and precipitate the pulp. Stirring can evenly distribute the raw materials in water, ensure the full utilization of raw materials and the uniformity of pulp quality in subsequent processing steps, promote fiber dispersion, accelerate the mixing of additives and pulp, improve the reaction efficiency of additives and materials, ensure that the medicament can act evenly on the fibers in the pulp, promote dissolution and reaction. During the degumming process, stirring can accelerate the dissolution and dispersion of gum, making it easier to remove from the pulp, improving pulp performance. At the same time, stirring also helps to reduce bubbles and impurities in the pulp, improve the purity and quality of the pulp. After obtaining an effective suspension by stirring, it is also necessary to perform self-weight precipitation to remove ineffective impurities in the suspension.

[0003] Currently, most agitators provide the stirring force by a stirring center with stirring blades. The centrifugal force and centripetal force generated during stirring are too large, resulting in the divergence of the heavier components in the pulp outward and the convergence of the lighter components inward. The separation of these components will lead to uneven stirring and affect the mixing efficiency of the pulp. Summary of the Invention

[0004] This application proposes a pulp precipitation stirring device and its stirring process, which has the advantages that the up-and-down movement of the extrusion plate axially changes the position of the slurry, the diversion holes circumferentially change the movement direction of the slurry, the extrusion plate drives the flexible stirring blades to stack and open, the slurry impacts the unfolded flexible stirring blades to rotate circumferentially, the circumferentially rotating flexible stirring blades stir the slurry circumferentially, and the slurry makes a secondary turn through the inclined holes, so as to solve the problem that the existing stirring blades centrifuge and stir the slurry, resulting in the dispersion and convergence of the slurry and uneven stirring.

[0005] To achieve the above object, this application adopts the following technical solution: A pulp precipitation stirring device and its stirring process, including a stirring tank with a preparation chamber opened, a top cover is arranged at the top of the stirring tank, and a hydraulic cylinder with a hydraulic rod movably sleeved is arranged at the center of the top of the top cover for providing the power of stirring; the bottom end of the hydraulic rod is provided with an extrusion plate movably sleeved in the preparation chamber for extruding the slurry following the up-and-down movement of the hydraulic rod, and evenly distributed diversion holes are opened on the extrusion plate for guiding the slurry to pass through the extrusion plate for up-and-down surging stirring.

[0006] Preferably, the cross-section of the diversion hole is inclined in the circumferential direction for changing the flow direction of the slurry.

[0007] Preferably, a stirring impeller is movably sleeved in the preparation cavity. The stirring impeller includes two sets of symmetric collar groups up and down and flexible stirring blades evenly fixed between the collar groups, which are used for circumferentially stirring the surrounding slurry.

[0008] Preferably, the collar group includes an inner collar on the inner side and an outer collar on the outer side. The inner collar is close to the hydraulic rod, and the outer collar is close to the side wall of the preparation cavity, which is used to pull open the flexible stirring blades to cover a larger range.

[0009] Preferably, the cross-sections of the inner collar and the outer collar are both L-shaped. The upper inner collar and outer collar are arranged at the bottom end of the top cover, which is used to limit the movement direction of the stirring impeller. The lower inner collar and outer collar are arranged at the top end of the extrusion plate, which is used to drive the flexible stirring blades to unfold and stack.

[0010] Preferably, the flexible stirring blades are inclined in the circumferential direction of the extrusion plate. When the flexible stirring blades unfold, they bulge towards the circumferential side in an arc shape, which is used to receive the impact force of the slurry in the circumferential direction when unfolding.

[0011] Preferably, the inclined direction of the diversion hole is directly opposite to the arc-shaped groove side of the flexible stirring blade, which is used to guide the upwelling slurry to impact the flexible stirring blade.

[0012] Preferably, inclined holes are formed in the flexible stirring blades. The inclined direction of the inclined holes is directly opposite to the arc-shaped convex side of the flexible stirring blade, which is used to guide the slurry passing through the inclined holes to turn.

[0013] A stirring process of a pulp precipitation stirring device includes the following stirring steps:

[0014] S1. First, inject the slurry into the preparation cavity and cover the top cover.

[0015] S2. Then, start the hydraulic cylinder, and drive the extrusion plate to reciprocate up and down in the preparation cavity through the hydraulic rod.

[0016] S3. The downward-moving extrusion plate pulls the stacked flexible stirring blades to open, and squeezes the lower slurry to rush through the diversion hole towards the opened flexible stirring blades, pass through the inclined holes, and push the flexible stirring blades to drive the stirring impeller to rotate circumferentially.

[0017] S4. The upward-moving extrusion plate squeezes the opened flexible stirring blades to stack, and squeezes the upper slurry to enter the space below the extrusion plate through the diversion hole.

[0018] A pulp precipitation stirring device and its stirring process provided by the present application drive an extrusion plate to reciprocate up and down through a hydraulic rod, so that the extrusion plate extrudes the slurry in the moving direction during the movement, prompting the slurry to pass through the inclined diversion holes through the extrusion plate and enter the space opposite to the moving direction of the extrusion plate. Since the diversion holes are inclined, the slurry passing through the diversion holes flows in the direction of the inclination of the diversion holes, so that the slurry flows in a reverse direction and is mixed during the intermittent process of passing through the diversion holes, and is separated and dispersed through the diversion holes, thereby performing efficient stirring operations.

[0019] At the same time, when the extrusion plate moves downward, it will pull and unfold the stacked flexible stirring blades, and when the extrusion plate moves upward, it will squeeze and retract the unfolded flexible stirring blades, so that the flexible stirring blades during the unfolding and stacking processes push the surrounding flowing slurry, affecting the flow direction of the slurry, so that the affected slurry fully impacts and mixes with the surrounding flowing slurry, improving the stirring efficiency.

[0020] At the same time, after the flexible stirring blades are unfolded, they are arc-shaped in the circumferential direction. The slurry passing through the diversion holes from below to above the extrusion plate will flow toward the concave side of the flexible stirring blades, so that the slurry impacts on the concave part of the flexible stirring blades, passes through the inclined holes inclined downward on the flexible stirring blades, and applies a thrust in the circumferential direction (the direction of slurry flow) to the flexible stirring blades, causing the entire stirring impeller to rotate slowly in the circumferential direction, so that the flexible stirring blades circumferentially stir the surrounding slurry, further improving the stirring and mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings forming a part of the specification depict the embodiments disclosed in the present application and, together with the specification, are used to explain the principles disclosed in the present application.

[0022] Referring to the drawings, the present application can be more clearly understood according to the following detailed description, where:

[0023] Figure 1 is a schematic three-dimensional external view of the present invention;

[0024] Figure 2 is a schematic diagram of the internal structure distribution of the present invention;

[0025] Figure 3 is a schematic diagram of the structural position of the stirring impeller of the present invention;

[0026] Figure 4 is a schematic diagram of the structure of the collar group of the present invention.

[0027] Wherein: 1, stirring tank; 2, preparation chamber; 3, top cover; 4, hydraulic cylinder; 5, hydraulic rod; 6, extrusion plate; 7, diversion hole; 8, inner collar; 9, outer collar; 10, flexible stirring blade; 11, inclined hole. Detailed implementation mode

[0028] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application. Embodiment 1

[0029] Please refer to Figures 1 to 2 , a pulp precipitation stirring device and its stirring process, including a stirring tank 1, a preparation chamber 2 is provided in the stirring tank 1, a top cover 3 is buckled on the top of the stirring tank 1, and the preparation chamber 2 is sealed through the top cover 3 to prevent additional air from entering the preparation chamber 2 during stirring and affecting the slurry. A hydraulic cylinder 4 is bolted to the center of the top of the top cover 3, and a hydraulic rod 5 is movably sleeved in the hydraulic cylinder 4.

[0030] Refer to Figure 2 , the bottom end of the hydraulic rod 5 is fixedly connected with a pressing plate 6, the pressing plate 6 is movably sleeved in the preparation chamber 2, the circumferential side wall of the pressing plate 6 is attached to the wall of the preparation chamber 2, and uniformly distributed diversion holes 7 are provided on the pressing plate 6. The cross-section of the diversion holes 7 is inclined in the circumferential direction, so that when the hydraulic cylinder 4 is started, the pressing plate 6 can be driven by the hydraulic rod 5 to reciprocate up and down. When the pressing plate 6 moves downward, it will press the slurry below, and the slurry will be dispersed into the space above the pressing plate 6 through the inclined diversion holes 7. At this time, the inclined diversion holes 7 will guide the slurry passing through the diversion holes 7 to flow in the circumferential direction. Similarly, when the pressing plate 6 moves upward, it will press the slurry above, and the slurry will be dispersed into the space below the pressing plate 6 through the inclined diversion holes 7. At this time, the inclined diversion holes 7 will guide the slurry passing through the diversion holes 7 to flow in the circumferential direction on the other side, so that the slurry surges and disperses in the vertical direction and reciprocates and turns in the circumferential direction. Different from the existing circumferential agitation of the slurry rotating stirring to provide centrifugal force, the similar components in the slurry are mixed more evenly on the inner or outer side of the preparation chamber 2, reducing the divergence and convergence of similar components after preparation. Embodiment 2

[0031] Please refer to Figures 2 to 4 , on the basis of Embodiment 1, a stirring impeller is movably sleeved in the preparation chamber 2. The stirring impeller includes two sets of upper and lower symmetrically arranged ring sets and uniformly distributed flexible stirring blades 10 fixed between the ring sets.

[0032] Refer to Figures 2 to 4, the collar set includes an inner collar 8 on the inner side and an outer collar 9 on the outer side. The inner collar 8 is close to the hydraulic rod 5, and the outer collar 9 is close to the side wall of the preparation chamber 2. The cross-sections of both the inner collar 8 and the outer collar 9 are L-shaped. The upper inner collar 8 and outer collar 9 are movably sleeved on the bottom end of the top cover 3, and the lower inner collar 8 and outer collar 9 are movably sleeved on the top end of the pressing plate 6, so that the top cover 3 and the pressing plate 6 limit the position of the collar set, enabling the collar set to only perform concentric circumferential movement within the top cover 3 and the pressing plate 6. At the same time, when the pressing plate 6 moves up and down, it can drive the movably sleeved collar set to perform synchronous up and down movement. When the pressing plate 6 moves upward, the distance between the two sets of collar sets above and below decreases, squeezing and stacking the flexible stirring blades 10 in the middle. During this process, the slurry around the flexible stirring blades 10 is squeezed and displaced, changing the movement direction of the surrounding slurry. When the pressing plate 6 moves downward, the distance between the two sets of collar sets above and below increases, pulling the stacked flexible stirring blades 10 in the middle to open. During this process, the slurry around the flexible stirring blades 10 is displaced and pushed, changing the movement direction of the surrounding slurry again and colliding and mixing with the flowing slurry around, further improving the stirring effect.

[0033] The material of the flexible stirring blade 10 can be selected from elastic materials such as rubber or thermoplastic polyester elastomer according to different slurry requirements. Embodiment III

[0034] Please refer to Figures 2 to 3 , on the basis of Embodiment II, the flexible stirring blade 10 is inclined in the circumferential direction of the pressing plate 6, and the inclination angle is not greater than twenty degrees. When the flexible stirring blade 10 is unfolded, it protrudes toward one side in the circumferential direction and is arc-shaped.

[0035] Refer to Figures 2 to 3, the direction in which the diversion hole 7 inclines is exactly opposite to the concave groove side of the flexible stirring blade 10 in an arc shape. An inclined hole 11 is formed in the flexible stirring blade 10, and the direction in which the inclined hole 11 inclines downward is exactly opposite to the convex side of the flexible stirring blade 10 in an arc shape. After the flexible stirring blade 10 is unfolded, it is in an arc shape in the circumferential direction. The slurry that passes through the diversion hole 7 from below and reaches above the pressing plate will flow towards the concave side of the flexible stirring blade 10, so that the slurry impacts on the concave part of the flexible stirring blade 10, passes through the inclined hole 11 that inclines downward on the flexible stirring blade 10, and applies a thrust in the circumferential direction (the direction in which the slurry flows) to the flexible stirring blade 10, causing the entire stirring impeller to rotate slowly in the circumferential direction, so that the flexible stirring blade 10 stirs the surrounding slurry in the circumferential direction, further improving the stirring and mixing effect. At the same time, when the flexible stirring blade 10 is unfolded, as the pressing plate 6 continues to move downward, the flexible stirring blade 10 will continue to be pulled, the convexity degree becomes smaller, and the inclined hole 11 is enlarged. At this time, the content of the slurry passing through the inclined hole per unit time increases, and the impurities remaining in the inclined hole are removed. At this time, the surface area of the flexible stirring blade 10 will also increase, and the impacted area of the slurry received increases, which will increase the rotation speed of the entire stirring impeller. It should be noted that the slurry surging through the diversion hole 7 will change direction once and then pass through the inclined hole 11 again, and will change direction for the second time, and will impact and mix in multiple directions with the surrounding surging slurry. During the stacking process of the flexible stirring blades, part of the slurry will also flow and turn through the compressed inclined hole 11, further increasing the flow effect and flow direction of the slurry and improving the stirring effect.

[0036] A stirring process of a pulp precipitation stirring device includes the following stirring steps:

[0037] S1. First, inject the slurry into the preparation chamber 2 and cover the top cover 3;

[0038] S2. Then, start the hydraulic cylinder 4, and drive the pressing plate 6 to reciprocate up and down in the preparation chamber 2 through the hydraulic rod 5;

[0039] S3. The pressing plate 6 moving downward pulls the stacked flexible stirring blades 10 to open, and squeezes the slurry below to rush towards the opened flexible stirring blades 10 through the diversion hole 7, passes through the inclined hole 11, and pushes the flexible stirring blade 10 to drive the stirring impeller to rotate circumferentially;

[0040] S4. The pressing plate 6 moving upward squeezes the opened flexible stirring blades 10 to stack, and squeezes the slurry above to enter the space below the pressing plate 6 through the diversion hole 7.

Claims

1. A pulp precipitation stirring device, characterized in that, It includes a stirring tank (1) with a preparation chamber (2) opened therein. A top cover (3) is provided at the top of the stirring tank (1). A hydraulic cylinder (4) with a hydraulic rod (5) movably sleeved therein is provided at the center of the top of the top cover (3) for providing the power for stirring. The bottom end of the hydraulic rod (5) is provided with a pressing plate (6) movably sleeved in the preparation chamber (2) for squeezing the slurry up and down following the hydraulic rod (5). Uniform diversion holes (7) are opened on the pressing plate (6) for guiding the slurry to pass through the pressing plate (6) to stir by surging up and down. A stirring impeller is movably sleeved in the preparation chamber (2). The stirring impeller includes two sets of upper and lower symmetrically arranged ring sets and uniformly distributed flexible stirring blades (10) fixed between the ring sets for circumferentially stirring the surrounding slurry. Inclined holes (11) are opened on the flexible stirring blades (10) for changing the flow direction of the slurry. The inclined direction of the diversion holes (7) faces the arc-shaped groove side of the flexible stirring blade (10) for guiding the surging slurry to impact the flexible stirring blade (10). The inclined downward direction of the inclined holes (11) faces the arc-shaped convex side of the flexible stirring blade (10) for guiding the slurry passing through the inclined holes (11) to impact the flexible stirring blade (10).

2. The pulp precipitation stirring device according to claim 1, characterized in that, The cross-section of the diversion holes (7) is inclined in the circumferential direction for changing the flow direction of the slurry.

3. The pulp precipitation stirring device according to claim 2, characterized in that, The ring set includes an inner ring (8) on the inner side and an outer ring (9) on the outer side. The inner ring (8) is close to the hydraulic rod (5), and the outer ring (9) is close to the side wall of the preparation chamber (2) for stretching the flexible stirring blades (10) to cover a larger range.

4. A pulp precipitation stirring device according to claim 3, characterized in that, The cross-sections of the inner ring (8) and the outer ring (9) are both L-shaped. The upper inner ring (8) and outer ring (9) are arranged at the bottom end of the top cover (3) for restricting the movement direction of the stirring impeller. The lower inner ring (8) and outer ring (9) are arranged at the top end of the pressing plate (6) for driving the flexible stirring blades (10) to expand and stack.

5. A pulp precipitation stirring device according to claim 4, characterized in that, The flexible stirring blades (10) are inclined in the circumferential direction of the pressing plate (6). When the flexible stirring blades (10) are expanded, they bulge towards the circumferential side in an arc shape for receiving the impact force of the slurry in the circumferential direction when expanded.

6. A stirring process for pulp precipitation, applied to a pulp precipitation stirring device as described in claim 5, characterized in that, It includes the following stirring steps: S1. First, inject the slurry into the preparation chamber (2) and cover the top cover (3). S2. Then, start the hydraulic cylinder (4) to drive the pressing plate (6) to reciprocate up and down in the preparation chamber (2) through the hydraulic rod (5). S3. The downward moving pressing plate (6) pulls the stacked flexible stirring blades (10) to open and squeezes the lower slurry to rush towards the opened flexible stirring blades (10) through the diversion holes (7), passes through the inclined holes (11), and pushes the flexible stirring blades (10) to drive the stirring impeller to rotate circumferentially. S4. The upward moving pressing plate (6) squeezes the opened flexible stirring blades (10) to stack and squeezes the upper slurry to enter the space below the pressing plate (6) through the diversion holes (7).

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