A pulp pond stirring system

Abstract

A kind of pulp water pool stirring system belongs to the technical field of mixing dispersion equipment for sewage treatment, system includes: stirring shaft and sleeve.The lower end of stirring shaft is circumferentially provided with multiple lower paddles, stirring shaft is driven by motor, there is predetermined interval between lower paddle and the bottom surface of pulp water pool, the top surface of lower paddle is inclined towards the upper side of the rotation direction of stirring shaft, the middle section of stirring shaft is circumferentially provided with multiple upper paddles, stirring shaft is inserted into pulp water pool in vertical state, both lower paddle and upper paddle are immersed below the liquid level of pulp water pool;Sleeve is coaxially sleeved on the outside of the lower end of stirring shaft, there is predetermined interval between the lower end surface of sleeve and the bottom surface of pulp water pool, the inner wall of sleeve is provided with annular plate, the inner edge of annular plate is inclined towards the upper side of sleeve axis.The overall structure of the scheme is simple, and can further improve the mixing dispersion effect.

Description

Technical Field

[0001] This invention belongs to the technical field of mixing and dispersing equipment for wastewater treatment, and particularly relates to a slurry tank mixing system. Background Technology

[0002] In the process of solid construction waste treatment, waste concrete needs to be poured into a sand and gravel separator to separate sand, gravel, and muddy wastewater. The separated fine sand and gravel fall into a silo for recycling, while the wastewater generated by the sand and gravel separator is collected in a slurry mixing tank and then pumped into a filter press for solid-liquid separation. The wastewater needs to be stirred before entering the filter press to ensure that the sludge and flocculant are fully mixed to form uniform flocs, thereby improving filtration efficiency and dewatering effect. Stirring also prevents the sedimentation of substances in the sludge, ensuring the stability and effectiveness of the filtration process.

[0003] Existing mixing devices typically use a stirring shaft inserted into the slurry tank for mixing. To cover a larger area, the stirring shaft is mounted on a moving system, allowing it to move along the length and width of the slurry tank. Furthermore, to enhance mixing efficiency, existing devices often employ multiple stirring shafts and more complex impeller designs. Because the impeller cannot directly contact the bottom of the slurry tank, even with these existing solutions, the problem of material deposition remains largely unresolved, resulting in limited improvements in mixing efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a slurry tank mixing system with a simple overall structure that can further improve the mixing and dispersion effect.

[0005] In order to achieve the objective of this invention, the following solution is proposed:

[0006] A slurry tank mixing system includes: a mixing shaft and a sleeve.

[0007] The lower end of the stirring shaft is provided with multiple lower blades along the circumference. The stirring shaft is driven by a motor. There is a predetermined gap between the lower blades and the bottom surface of the slurry tank. The top surface of the lower blades is inclined upwards towards the direction of rotation of the stirring shaft. The middle section of the stirring shaft is provided with multiple upper blades along the circumference. The stirring shaft is inserted into the slurry tank in a vertical state. Both the lower blades and the upper blades are submerged below the liquid surface of the slurry tank.

[0008] The sleeve is coaxially fitted on the outside of the lower end of the stirring shaft. There is a predetermined gap between the lower end face of the sleeve and the bottom surface of the slurry tank. The inner wall of the sleeve is provided with an annular plate, and the inner edge of the annular plate is inclined towards the upper part of the sleeve axis.

[0009] The beneficial effects of this invention are as follows:

[0010] 1. The solution does not require multiple stirring shafts or complex structural designs for the upper and lower blades, yet it can effectively raise the substances and liquids at the bottom of the tank, prevent substances from settling, increase the probability of mixing between the lower liquid and substances and the upper liquid, and improve the mixing effect.

[0011] 2. The sleeve is connected to the plate via a guide rod, and the guide rod passes through the plate. As the lower blade drives the liquid at the bottom of the pool to rise from the bottom of the sleeve, the flowing liquid will push the sleeve upward through the annular plate, making the upper end of the sleeve closer to the upper blade, and making the rising liquid and substances at the bottom of the pool closer to the upper blade, thereby using the upper blade to further improve the mixing and distribution effect. Attached Figure Description

[0012] The accompanying drawings described herein are merely illustrative of selected embodiments, not all possible implementations, and are not intended to limit the scope of the invention.

[0013] Figure 1 A schematic diagram of the overall structure of this application is shown.

[0014] Figure 2 A schematic diagram of the assembly structure of the stirring shaft, sleeve and buoyancy disk of this application is shown.

[0015] Figure 3 An exploded view of the structure of the stirring shaft, sleeve, and buoyancy disc of this application is shown.

[0016] Figure 4 A cross-sectional view of the stirring shaft, sleeve, and buoyancy disc of this application is shown.

[0017] Figure 5 The diagram shows a cross-sectional view of the stirring shaft, sleeve, and buoyancy disc of this application during the stirring process.

[0018] The markings in the diagram are: stirring shaft-1, lower blade-11, auxiliary blade-111, upper blade-12, hub-13, connecting pipe-14, thrust bearing-15, sleeve-2, annular plate-21, guide rod-22, flat plate-3, buoyancy plate-4, guide rail-5, traveling trolley-6, and crossbeam-61. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the implementation methods of the present invention will be described in detail below with reference to the accompanying drawings. However, the embodiments described in this invention are only some embodiments of the present invention, and not all embodiments.

[0020] like Figures 2 to 5 As shown, a slurry tank mixing system includes: a mixing shaft 1 and a sleeve 2.

[0021] Specifically, such as Figures 3 to 5As shown, the lower end of the stirring shaft 1 is provided with multiple lower blades 11 along the circumference. The stirring shaft 1 is driven by a motor. There is a predetermined gap between the lower blades 11 and the bottom surface of the slurry tank to prevent collision with the bottom of the tank and damage. The top surface of the lower blades 11 is inclined upwards in the direction of rotation of the stirring shaft 1, so that the liquid flows upwards under the stirring action of the lower blades 11. The middle section of the stirring shaft 1 is provided with multiple upper blades 12 along the circumference. The stirring shaft 1 is inserted into the slurry tank in a vertical state, and both the lower blades 11 and the upper blades 12 are submerged below the liquid surface of the slurry tank.

[0022] Specifically, such as Figures 2 to 5 As shown, the sleeve 2 is coaxially fitted onto the outer side of the lower end of the stirring shaft 1. Therefore, the lower impeller 11 is also located inside the sleeve 2 to protect it and prevent it from being damaged by impact. There is a predetermined gap between the lower end face of the sleeve 2 and the bottom surface of the slurry tank. When the lower impeller 11 rotates, it will cause the liquid to flow upward, reducing the pressure at the lower end of the sleeve 2. This allows the liquid and substances at the bottom of the tank to enter from the lower end of the sleeve 2 and flow out from the top of the sleeve 2. The inner wall of the sleeve 2 is provided with an annular plate 21. The inner edge of the annular plate 21 is inclined upward towards the axis of the sleeve 2. During the upward discharge of the liquid inside the sleeve 2, it is guided by the annular plate 21 to converge axially towards the sleeve 2, thereby increasing the height of the liquid and the substances at the bottom of the tank. This allows the substances in the liquid more time to mix with a larger area of ​​the liquid, such as flocculants, thereby improving the mixing and dispersion effect. On the other hand, increasing the height at which the liquid and substances rise allows them to get closer to, or even completely into, the stirring range of the upper impeller 12, thereby further improving the mixing and dispersion effect. The above solution does not require multiple stirring shafts 1, nor does it involve complex structural designs for the upper impeller 12 and lower impeller 11. It effectively raises the substances and liquid at the bottom of the tank, preventing substances from settling, and increases the probability of mixing between the lower and upper layers of liquid and substances, thus improving the mixing effect. The upper impeller 12 further enhances the mixing and dispersion effect by stirring the upper liquid and the rising lower liquid and substances.

[0023] Preferred, such as Figure 2 , Figure 4 and Figure 5 As shown, the stirring shaft 1 is vertically inserted into a horizontally positioned plate 3. The sleeve 2 is equipped with multiple guide rods 22 parallel to the axis. The upper ends of the guide rods 22 pass vertically through the plate 3 to prevent the sleeve 2 from rotating around the axis and to fix the radial position of the sleeve 2 to prevent the sleeve 2 from contacting the lower impeller 11. Specifically, the top surface of the guide rods 22 is provided with a limiting plate located above the plate 3 to prevent the guide rods 22 from separating from the plate 3 and to limit the lowest position of the sleeve 2.

[0024] In a further preferred embodiment, the guide rod 22 is slidably disposed relative to the plate 3 so that the sleeve 2 has the function of moving in the vertical direction, thereby further increasing the height of the liquid and substances rising from the bottom of the pool.

[0025] Preferred, such as Figure 1 As shown, the slurry tank mixing system also includes guide rails 5 parallel to both sides of the slurry tank. A traveling trolley 6 is mounted on the guide rails 5. The traveling trolleys 6 on both sides are connected by at least two parallel crossbeams 61. The crossbeams 61 are perpendicular to the guide rails 5 and both pass through the plate 3. With the above scheme, the working range of the mixing shaft 1 can cover the entire slurry tank. The traveling trolleys 6 can be manually pushed or driven synchronously by their respective motors. Its structure is similar to the existing gantry crane traveling system. The plate 3 can be moved along the crossbeams 61 by manual adjustment, or a screw parallel to the crossbeams 61 can be set to pass through the plate 3. The plate 3 can be moved by rotating the screw. The screw can be manually rotated or driven by a motor.

[0026] Preferred, such as Figure 3 As shown, the outer end of the lower blade 11 is provided with an upwardly inclined secondary blade 111. The angle between the secondary blade 111 and the top surface of the lower blade 11 is 100°~160°. The secondary blade 111 can increase the suction force of the lower end of the sleeve 2 on the liquid and substances at the bottom of the pool, so that the liquid and substances around the lower end of the sleeve 2 can enter the sleeve 2 more smoothly, and increase the attraction range of the lower end of the sleeve 2, thereby improving the mixing efficiency.

[0027] Preferred, such as Figures 2 to 5 As shown, the upper blades 12 are all mounted on the outer wall of a hub 13. The inner hole of the hub 13 has a polygonal structure or a spline hole structure. The hub 13 is coaxially fitted onto the middle section of the stirring shaft 1. The outer contour of the middle section of the stirring shaft 1 matches the inner hole of the hub 13. The hub 13 is movable along the axis of the stirring shaft 1 to facilitate adjustment of the height of the upper blades 12, adapting to washing tanks of different water depths, thereby ensuring the mixing effect. More preferably, to limit the extreme positions of the hub 13's vertical movement, baffles can be installed at both ends of the matching length range between the middle section of the stirring shaft 1 and the hub 13. More specifically, the hub 13 can be locked onto the stirring shaft 1 with screws, and the operator can manually adjust it according to the depth of the liquid in the washing tank. During use, to prevent impurities from accumulating in the middle section of the stirring shaft 1, the stirring shaft 1 can be cleaned periodically using a high-pressure water gun or a brush head.

[0028] Preferred, such as Figures 2 to 5As shown, the upper end of the hub 13 is rotatably mounted on the lower end of a ring-shaped buoyancy disk 4, and there is a predetermined distance between the hub 13 and the bottom surface of the buoyancy disk 4, so that the upper blade 12 is submerged in the liquid and the upper blade 12 is closer to the upper end of the sleeve 2. The stirring shaft 1 passes through the annular inner hole of the buoyancy disk 4. During stirring and in non-working state, the buoyancy disk 4 floats on the liquid surface. The user can design the buoyancy of the buoyancy disk 4 according to actual needs, as long as the buoyancy disk 4 is always floating. As a preferred solution, there is a gap between the stirring shaft 1 and the annular inner hole of the buoyancy disk 4; this solution allows the upper blade 12 to adapt to the height of the liquid surface without manual adjustment. In specific implementation, the circumferential freedom of the buoyancy disk 4 can be unrestricted, allowing it to float freely. When the friction between it and the hub 13 is large, it will rotate with the hub 13; when the friction cannot drive the buoyancy disk 4 to rotate, the buoyancy disk 4 will remain stationary. As a preferred solution, the guide rod 22 can be used to circumferentially limit the buoyancy disk 4. A ring corresponding to the guide rod 22 is set on the circumference of the buoyancy disk 4, and the ring is sleeved on the corresponding guide rod 22.

[0029] Preferably, the top surface of the upper blade 12 is inclined upwards toward the direction of rotation of the stirring shaft 1. The upper blade 12 with this structural design can be subjected to the downward pressure generated by the liquid when rotating, so that the upper blade 12 is always immersed in the liquid during the rotation process, thereby ensuring the stirring effect and preventing the upper blade 12 from pushing the buoyancy plate 4 upwards.

[0030] Further preferred, such as Figures 2 to 5 As shown, a connecting pipe 14 is coaxially provided at the upper end of the hub 13. The connecting pipe 14 coaxially passes through the annular inner hole of the buoyancy disk 4. A disc is provided on the outer side of the upper end of the connecting pipe 14. A thrust bearing 15 is coaxially provided between the bottom surface of the disc and the top surface of the buoyancy disk 4. This design places the thrust bearing 15, the structure that rotatably connects the hub 13 and the buoyancy disk 4, above the buoyancy disk 4. This can effectively prevent liquid and impurities from entering the thrust bearing 15, thereby allowing the thrust bearing 15 to maintain smooth rotation for a long time, reducing the resistance of the buoyancy disk 4 to the rotation of the upper blade 12, and also preventing the hub 13 from separating from the buoyancy disk 4. As a further preferred option, the thrust bearing 15 adopts a sealed structure to ensure its service life.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to be the only or limiting of the invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from its scope are all within the protection scope of the present invention.

Claims

1. A slurry tank mixing system, characterized in that, include: The stirring shaft (1) has multiple lower blades (11) arranged around its lower end. The stirring shaft (1) is driven by a motor. There is a predetermined gap between the lower blades (11) and the bottom surface of the slurry tank. The top surface of the lower blades (11) is inclined towards the direction of rotation of the stirring shaft (1). Multiple upper blades (12) are arranged around the middle section of the stirring shaft (1). The stirring shaft (1) is inserted into the slurry tank in a vertical state. Both the lower blades (11) and the upper blades (12) are submerged below the liquid surface of the slurry tank. The sleeve (2) is coaxially sleeved on the outside of the lower end of the stirring shaft (1). There is a predetermined gap between the lower end face of the sleeve (2) and the bottom surface of the slurry tank. The inner wall of the sleeve (2) is provided with an annular plate (21). The inner edge of the annular plate (21) is inclined towards the upper part of the axis of the sleeve (2). The stirring shaft (1) is vertically inserted into a horizontally arranged plate (3). The sleeve (2) is provided with multiple guide rods (22) parallel to the axis. The upper end of the guide rod (22) passes vertically through the plate (3) and the guide rod (22) is slidably arranged relative to the plate (3).

2. The slurry tank mixing system according to claim 1, characterized in that, It also includes guide rails (5) arranged parallel to both sides of the slurry pool. A traveling trolley (6) is provided on the guide rail (5). The traveling trolleys (6) on both sides are connected by at least two parallel crossbeams (61). The crossbeams (61) are perpendicular to the guide rail (5) and pass through the flat plate (3).

3. The slurry tank mixing system according to claim 1, characterized in that, The outer end of the lower blade (11) is provided with an upwardly inclined secondary blade (111), and the angle between the secondary blade (111) and the top surface of the lower blade (11) is 100°~160°.

4. The slurry tank mixing system according to claim 1, characterized in that, The upper blades (12) are all located on the outer wall of a hub (13). The inner hole of the hub (13) is a polygonal structure or a spline hole structure. The hub (13) is coaxially fitted in the middle section of the stirring shaft (1). The outer contour of the middle section of the stirring shaft (1) matches the inner hole of the hub (13). The hub (13) is moved along the axis of the stirring shaft (1).

5. The slurry tank mixing system according to claim 4, characterized in that, The upper end of the hub (13) is rotatably mounted on the lower end of a ring-shaped buoyancy disk (4), and there is a predetermined distance between the hub (13) and the bottom surface of the buoyancy disk (4). The stirring shaft (1) passes through the annular inner hole of the buoyancy disk (4). During the stirring process and in the non-working state, the buoyancy disk (4) floats on the liquid surface.

6. The slurry tank mixing system according to claim 5, characterized in that, The top surface of the upper blade (12) is tilted upward toward the direction of rotation of the stirring shaft (1).

7. The slurry tank mixing system according to claim 5, characterized in that, A connecting pipe (14) is coaxially provided at the upper end of the hub (13). The connecting pipe (14) passes through the annular inner hole of the buoyancy disk (4) coaxially. A disc is provided on the outer side of the upper end of the connecting pipe (14). A thrust bearing (15) is coaxially provided between the bottom surface of the disc and the top surface of the buoyancy disk (4).

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