An arc cross-section stirring and flipping paddle and a method of using the same

Abstract

The application discloses an arc-shaped section stirring and throwing paddle and a use method thereof, and belongs to the technical field of vertical aerobic fermentation tank equipment protection for treating solid organic waste, and solves the technical problems of high manufacturing cost, increased radial stress intensity and poor aeration effect of the stirring paddle of the aerobic fermentation tank in the prior art. The arc-shaped section stirring and throwing paddle is characterized in that the stirring and throwing paddle is an arc-shaped paddle extending in a radial direction and having a curved arc section, the arc-shaped paddle is composed of an arc-shaped section paddle bending plate at an upper portion and a planar bottom plate at a bottom portion, front plates and tail plates are respectively arranged at left and right sides of the arc-shaped paddle, the arc-shaped paddle at one side of the front plate is connected with a stirring main shaft through a connecting structure, and a spiral blade is arranged on the outer side of the paddle bending plate of the arc-shaped paddle close to the tail plate; a plurality of first aeration hole combinations are arranged on the paddle bending plate along the radial direction; the first aeration hole combinations are arranged at positions lower than the highest point of the arc top of the paddle bending plate, and the openings of the first aeration hole combinations are arranged to be inclined downward by 2-5 degrees along the horizontal direction.

Description

Technical Field

[0001] This invention relates to the field of protection technology for vertical aerobic fermentation tank equipment used for treating solid organic waste, specifically to an arc-shaped cross-section stirring and turning impeller and its usage method. Background Technology

[0002] The vertical aerobic fermentation tank for solid organic waste is a complete set of equipment for treating organic waste such as livestock and poultry manure, kitchen waste, and domestic sewage sludge. Air is intermittently supplied to the fermentation tank by a blower, and high-temperature aerobic fermentation is carried out using the activity of microorganisms to biologically decompose and mature the organic matter in the waste materials, ultimately converting it into organic fertilizer for soil improvement, landscaping, and fruit and vegetable fertilization, thus achieving the recycling and reuse of organic waste resources.

[0003] In recent years, the impellers of vertical aerobic fermenters for treating solid organic waste have mostly been unequal-sided prismatic or rectangular in shape. Furthermore, the radial stress increases with the tank diameter-to-height ratio and the height of the organic waste. However, this type of impeller has the following drawbacks in practical use:

[0004] 1. During actual operation, the blade experiences varying degrees of stress at each radial section towards the tank wall, centered on the main shaft. Qualitatively, the stress is greater at radii closer to the main shaft than at larger radii farther away. Smaller radii around the main shaft exhibit high stress, classifying them as high-risk sections. Larger radii around the main shaft experience lower stress, classifying them as relatively safe sections. Therefore, the greater the distance from the main shaft, the greater the safety margin. When organic waste is evenly distributed, stress analysis shows that the blade is subjected to both tension and compression at the midpoint of its length, making it prone to breakage. This results in low material utilization and high manufacturing costs.

[0005] 2. Blades with ordinary cross sections have low load-bearing capacity, high equipment failure rate, and low equipment utilization rate, resulting in high equipment operating costs.

[0006] 3. The ordinary aeration paddle structure has high resistance to the gas flow through the aeration holes of the paddle. The gas blown out of the aeration blower enters the material through the pipeline, which reduces the amount of aeration that interacts with the material and greatly reduces the aeration effect. Summary of the Invention

[0007] This invention addresses the shortcomings and deficiencies of existing technologies by providing a simple, ingenious, and low-cost stirring impeller for vertical fermentation tanks used for solid organic waste. Its structural features include: an arc-shaped cross-section with added helical blades on the surface; during the movement of the impeller and shaft, the helical blades automatically clean up any material falling onto the back of the impeller; the irregular force direction of the arc-shaped cross-section reduces material thickness and cost; the arc-shaped cross-section effectively reduces the contact area between the impeller and the material, lowering the impeller's operating resistance and reducing energy consumption. This invention also relates to the arc-shaped cross-section stirring and turning impeller and its usage method.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution: The arc-shaped cross-section stirring and tumbling blade provided by the present invention is an arc-shaped blade extending radially and having a curved cross-section. The arc-shaped blade is composed of an upper arc-shaped cross-section blade bending plate and a bottom flat plate. A front plate and a tail plate are respectively provided on the left and right sides of the arc-shaped blade. The arc-shaped blade on the front plate side is connected to the stirring main shaft through a connecting structure. A spiral blade is connected to the outer side of the blade bending plate of the arc-shaped blade on the side near the tail plate.

[0009] Multiple first aeration hole combinations are provided on the blade bending plate along the radial direction; the first aeration hole combination is located below the highest point of the blade bending plate arc, and the opening of the first aeration hole combination is set to be inclined downward at 2°-5° along the horizontal direction.

[0010] Preferably, the front plate is provided with an air inlet, and the tail plate is provided with a second aeration hole with a diameter smaller than that of the air inlet.

[0011] Preferably, a middle vertical plate is provided inside the stirring and turning blade, between the blade bending plate and the flat bottom plate, extending radially and perpendicular to the flat bottom plate. The middle vertical plate divides the internal cavity of the stirring and turning blade into two. Two rows of first aeration holes are symmetrically arranged on the blade bending plates on both sides of the middle vertical plate. Two matching second aeration holes are also provided on the tail plates on both sides of the middle vertical plate.

[0012] Preferably, a support plate is provided at one end of the front plate and at the bottom of the flat bottom plate, which is fixedly connected to the main shaft of the agitator. The bottom of the support plate is also provided with a support plate reinforcing rib at the fixed connection point with the main shaft of the agitator. The upper side wall of the blade bending plate is also provided with a blade reinforcing rib fixedly connected to the main shaft of the agitator.

[0013] Preferably, the overall structure of the stirring and turning impeller is made of plates of different thicknesses. The impeller bending plate is a thick plate with a thickness of 10mm-20mm. The thickness of the bottom plate is 0.6-1 times the thickness of the impeller bending plate, and the thickness of the middle vertical plate is 0.5 times the thickness of the impeller bending plate. The thickness of the front plate, tail plate and spiral blade is 0.2-0.5 times the thickness of the impeller bending plate.

[0014] Preferably, the stirring and tumbling blades are made of corrosion-resistant metal material, specifically stainless steel.

[0015] Preferably, the blade bend plate and the flat base plate are fixedly connected by seamless welding, and the bottom of the flat base plate is also fixed to the support plate reinforcing rib by welding.

[0016] The front plate, tail plate, and middle vertical plate are also fixed inside the mixing and tumbling blades by seamless welding.

[0017] The above-mentioned method of using arc-shaped cross-section stirring and tumbling blades involves using multiple stirring and tumbling blades axially distributed on a single stirring paddle shaft in combination.

[0018] This invention provides an arc-shaped cross-section stirring and tumbling impeller and its method of use. It possesses the following...

[0019] Beneficial effects:

[0020] (1) The arc-shaped cross-section stirring and turning paddle and its usage method of the present invention have a simple and ingenious structure and low manufacturing cost. They are especially suitable for stirring paddles in vertical fermentation tanks for solid organic waste. The structural features are: the paddle adopts an arc-shaped cross-section and adds spiral blades to the surface. During the movement of the paddle and shaft, the spiral blades can automatically clean the material falling on the back of the paddle. The arc-shaped cross-section structure reduces the material thickness and lowers the cost due to the irregular force direction. The arc-shaped cross-section effectively reduces the contact area between the paddle and the material, reduces the running resistance of the paddle, and reduces the energy consumption of the equipment.

[0021] (2) The arc-shaped cross-section stirring and turning impeller and its usage method of the present invention, by changing the shape of the impeller structure, enable the root of the impeller to withstand a larger tangential bending moment, significantly improving the impeller's load-bearing capacity. Thick plates are used for the impeller's vertical plate to increase the axial load in the vertical direction, while thin plates are used for the front plate, tail plate, and bottom plate. The impeller structure adopts a design with plates of different thicknesses, effectively reducing material usage and manufacturing costs. It also optimizes the stress state of the impeller during equipment operation, improving the stirring effect of the impeller on materials during equipment operation.

[0022] By improving the load-bearing capacity of the arc-shaped cross-section mixing and turning blades, the equipment failure rate is greatly reduced, the equipment utilization rate is significantly improved, the operation and maintenance costs are reduced, and users are brought significant economic benefits.

[0023] (3) The arc-shaped cross-section stirring and turning paddle and its usage method of the present invention, the arc-shaped paddle plate has aeration holes and the first aeration hole combination is lower than the highest point of the arc top of the paddle plate. The opening of the first aeration hole combination is set at a downward inclination of 2°-5° along the horizontal direction. On the one hand, it can block the material to prevent it from blocking the hole. On the other hand, the gas in the cavity acts evenly on the organic solid waste through the aeration holes on the arc-shaped paddle plate, so that the biomass reaction is uniform. The dispersed gas enters the material, which increases the contact area between the gas and the material and improves the aeration efficiency.

[0024] In addition, the spiral blades are welded to the outer surface of the arc-shaped blades. As the main shaft of the mixing paddle moves, they can automatically clean up the material that falls on the arc-shaped blades, reducing the bending stress on the arc-shaped blades. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 for Figure 1 A structural schematic diagram of the right view;

[0027] Figure 3 for Figure 1 A structural schematic diagram of the left view;

[0028] Figure 4 for Figure 1 A top view structural diagram;

[0029] Figure 5 for Figure 4 A structural schematic diagram of the cross-sectional view of EE;

[0030] Figure 6 for Figure 1 A structural schematic diagram of the bottom view;

[0031] Figure 7 for Figure 1 A schematic diagram of the structure of the front view;

[0032] Figure 8 for Figure 7 A structural schematic diagram of the cross-sectional view of BB;

[0033] Figure 9 for Figure 1 A schematic diagram of the structure of the front view;

[0034] Figure 10 for Figure 9 A structural schematic diagram of the cross-sectional view of DD;

[0035] Figure 11 This is a schematic diagram of the structure connecting the arc-shaped cross-section stirring and tumbling impeller blade to the stirring main shaft of the present invention;

[0036] Figure 12 for Figure 11 A schematic diagram of the cross-sectional view of AA.

[0037] In the diagram: 1. Arc-shaped blade, 2. Middle vertical plate, 3. Front plate, 4. Flat bottom plate, 5. Tail plate, 6. Spiral blade, 7. Support plate, 8. Blade reinforcing rib, 9. Support plate reinforcing rib, 10. Agitator shaft, 11. Air inlet, 12. First aeration hole assembly, 13. Second aeration hole. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] Please see Figures 1-12 The present invention provides a technical solution:

[0041] The present invention relates to an arc-shaped cross-section stirring and tumbling impeller. The stirring and tumbling impeller is an arc-shaped impeller 1 extending radially and having a curved cross-section. The arc-shaped impeller 1 is composed of an upper arc-shaped cross-section impeller bending plate and a bottom flat plate 4. A front plate 3 and a tail plate 5 are respectively provided on the left and right sides of the arc-shaped impeller 1. The arc-shaped impeller 1 on one side of the front plate 3 is connected to the stirring main shaft 10 through a connecting structure. A spiral blade 6 is connected to the outer side of the impeller bending plate near the tail plate 5. A plurality of first aeration hole combinations 12 are provided on the impeller bending plate along the radial direction. The first aeration hole combinations 12 are located below the highest point of the arc top of the impeller bending plate, and the openings of the first aeration hole combinations 12 are inclined downward at 2°-5° along the horizontal direction.

[0042] The arc-shaped cross-section stirring and turning impeller structure of this invention is ingeniously designed and used as a stirring impeller for vertical fermentation tanks for solid organic waste. The shape of the impeller is an arc-shaped roller bending structure. This structural design does not limit the degree of curvature of the arc. The use of an arc-shaped cross-section impeller with curvature in the radial direction can significantly reduce the maximum bending stress at the critical section and improve the overall load-bearing capacity of the impeller. Compared with other impeller structures with equal cross-sections in the radial direction, the use of impellers with arc-shaped cross-section structure in the same model of equipment can significantly improve the load-bearing capacity of the impeller, save raw materials, and reduce manufacturing costs.

[0043] The impeller, featuring a radially curved cross-section, optimizes the stress distribution during equipment operation. The spiral blades 6 are welded to the outer surface of the curved impeller, enhancing the mixing effect on materials. The synergistic effect of the curved cross-section and the spiral blades 6 allows for automatic cleaning of material falling onto the impeller back as the impeller rotates with the mixing shaft 10. The irregular force direction of the curved cross-section reduces material thickness, lowers costs, effectively reduces the contact area between the impeller and material, reduces impeller running resistance, and lowers equipment energy consumption.

[0044] At the same time, by changing the shape of the blade structure, the blade root can withstand a larger tangential bending moment, which greatly improves the blade load-bearing capacity. Due to the improved load-bearing capacity of the arc-shaped blade, the equipment failure rate is greatly reduced, the equipment utilization rate is significantly improved, the operation and maintenance costs are reduced, and significant economic benefits are brought about.

[0045] like Figures 7-10 As shown, the front plate 3, tail plate 5, and intermediate vertical plate 2 are also fixed inside the stirring and turning blades by seamless welding, resulting in low manufacturing cost and a stable connection structure. The front plate 3 is provided with an air inlet, and the tail plate 5 is provided with a second aeration hole 13 with a smaller diameter than the air inlet hole 11, which is beneficial to improving the aeration effect. An intermediate vertical plate 2 is provided inside the stirring and turning blades, between the blade bending plate and the flat bottom plate 4, extending radially and perpendicular to the flat bottom plate 4. The intermediate vertical plate 2 divides the internal cavity of the stirring and turning blades into two parts. Two rows of first aeration hole combinations 12 are symmetrically provided on the blade bending plates on both sides of the intermediate vertical plate 2. The tail plate 5 on both sides of the intermediate vertical plate 2 is also provided with two matching second aeration holes 13. The curved section of the blade is separated by a middle vertical plate 2, with openings on both sides. The middle vertical plate 2 not only acts as a reinforcing rib to increase the bending strength of the curved blade, but also divides the aeration chamber formed by the curved blade 1, the flat bottom plate 4, the front plate 3, and the tail plate 5 into two parts, reducing oxygen flow loss, distributing aeration evenly, increasing the amount of aeration interacting with the material, and improving aeration efficiency.

[0046] The arc-shaped paddle plate 1 has a first aeration hole assembly 12 with a roller bending structure. The first aeration hole assembly 12 is distributed along the axial symmetrical line and is lower than the highest point of the arc height. The openings of the first aeration hole assembly 12 are set at a downward inclination of 2°-5° along the horizontal direction. On the one hand, it can block the material to prevent the hole from being blocked. On the other hand, the gas in the inner cavity acts evenly on the organic solid waste through the aeration holes of the arc-shaped paddle plate 1, so that the biomass reaction is uniform. The dispersed gas enters the material, increasing the contact area between the gas and the material and improving the aeration efficiency.

[0047] A support plate 7, fixedly connected to the main shaft 10 of the agitator, is located at one end of the front plate 3 and at the bottom of the flat base plate 4. A support plate reinforcing rib 9 is also provided at the connection point between the support plate 7 and the main shaft 10, further enhancing the impeller's ability to withstand external pressure. A blade reinforcing rib 8, fixedly connected to the main shaft 10 of the agitator, is also provided on the upper side wall of the blade bend plate. The blade bend plate and the flat base plate 4 are fixedly connected by welding, and the bottom of the flat base plate 4 is also fixed to the support plate reinforcing rib 9 by welding. The support plate reinforcing rib 9 and the blade reinforcing rib 8 further enhance the stability of the connection between the arc-shaped cross-section agitator blade and the main shaft 10, significantly improving its ability to withstand external pressure.

[0048] The mixing and turning paddle is constructed from plates of varying thicknesses.

[0049] The mixing and turning impeller is constructed from plates of varying thicknesses. The blade's curved plate is a thick plate (10mm-20mm), the bottom plate is 0.6-1 times the thickness of the curved plate, and the central vertical plate is 0.5 times the thickness of the curved plate. The front plate, tail plate, and spiral blades are 0.2-0.5 times the thickness of the curved plate. The use of thick plates in the blade's vertical plates increases the axial load-bearing capacity in the vertical direction, while the front plate (3), tail plate (5), and bottom plate use thinner plates. This design, employing plates of varying thicknesses, effectively reduces material usage and manufacturing costs. It also optimizes the stress on the impeller during operation, improving the mixing effect on materials.

[0050] The stirring and turning blades are made of corrosion-resistant metal, specifically stainless steel, which extends the service life of the device, prevents corrosion during use, and ensures the continued effective use of the vertical aerobic fermentation tank equipment for treating solid organic waste using the arc-section stirring and turning blades of this invention.

[0051] The specific usage method is as follows:

[0052] like Figures 11-12As shown, multiple stirring and tumbling blades are axially distributed and fixedly connected to a stirring paddle main shaft 10 of the stirred reactor for combined use. The bottom of the flat base plate 4 is then fixedly connected to the stirring paddle main shaft 10 via a support plate reinforcing rib 9. The blade bending plate is also fixedly connected to the stirring paddle main shaft 10 via blade reinforcing ribs 8. The blade bending plate and the flat base plate 4 are fixedly connected by welding, and the bottom of the flat base plate 4 is also fixedly welded to the support plate reinforcing rib 9.

[0053] The aeration pipe inlet is introduced through the hollow structure inside the stirring paddle main shaft 10 and is connected to the air inlet 11 on the front plate 3. Aeration is carried out from the two sets of first aeration hole combinations 12 on both sides of the arc-shaped paddle 1 plate. At the same time, some gas is discharged from the second aeration hole 13 on the tail plate 5, which significantly improves the aeration effect.

[0054] This invention relates to a stirring paddle for a vertical fermentation tank for solid organic waste. The paddle features an arc-shaped cross-section and a spiral blade 6 added to its surface for synergistic effect. As the paddle rotates with the stirring shaft 10, the spiral blade 6 automatically cleans up any material falling onto the back of the paddle. The arc-shaped cross-section structure, due to the irregular force direction, reduces material thickness and costs, effectively reduces the contact area between the paddle and the material, lowers the paddle's running resistance, reduces equipment energy consumption, and significantly improves the stirring effect of the paddle on the material during equipment operation.

[0055] At the same time, by changing the shape of the blade structure, the blade root can withstand a larger tangential bending moment, which greatly improves the blade load-bearing capacity. Due to the improved load-bearing capacity of the arc-shaped blade, the equipment failure rate is greatly reduced, the equipment utilization rate is significantly improved, the operation and maintenance costs are reduced, and significant economic benefits are brought about.

[0056] In summary, the arc-shaped cross-section stirring and turning impeller and its usage method of the present invention are simple and ingenious in structure, low in manufacturing cost, and particularly suitable for stirring impellers in vertical fermentation tanks for solid organic waste. Its structural features are: the impeller adopts an arc-shaped cross-section, and a spiral blade 6 is added to the surface. During the movement of the impeller and the shaft, the spiral blade 6 can automatically clean up the material falling on the back of the impeller; the arc-shaped cross-section structure reduces the material thickness and lowers the cost due to the irregular force direction; the arc-shaped cross-section effectively reduces the contact area between the impeller and the material, reduces the running resistance of the impeller, and reduces the energy consumption of the equipment.

[0057] The above are merely embodiments of the present invention. For example, the overall structure of the stirring and turning impeller is made of plates of different thicknesses. The impeller bending plate is a thick plate with a thickness of 10mm-20mm. The thickness of the bottom plate is 0.6-1 times the thickness of the impeller bending plate, and the thickness of the middle vertical plate is 0.5 times the thickness of the impeller bending plate. The thickness of the front plate, tail plate, and spiral blade is 0.2-0.5 times the thickness of the impeller bending plate. The cross-sectional shape of the impeller bending plate is an arc-shaped impeller 1 with a curved arc, including but not limited to the arc shape shown in the figure. The stirring and turning impeller is made of stainless steel, but is not limited to metal materials. All of these can realize the arc-shaped cross-section stirring and turning impeller and its usage method of the present invention.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A stirring and tumbling impeller with an arc-shaped cross-section, characterized in that, The stirring and tumbling blade is an arc-shaped blade that extends radially and has a curved cross-section. The arc-shaped blade is composed of an upper arc-shaped cross-section blade bending plate and a bottom flat plate. A front plate and a tail plate are respectively provided on the left and right sides of the arc-shaped blade. The arc-shaped blade on the front plate side is connected to the stirring main shaft through a connecting structure. A spiral blade is connected to the outer side of the blade bending plate of the arc-shaped blade near the tail plate. A central vertical plate is provided inside the stirring and turning blade, between the blade bending plate and the flat bottom plate, extending radially and perpendicular to the flat bottom plate. The central vertical plate divides the internal cavity of the stirring and turning blade into two. Two rows of first aeration holes are symmetrically arranged on the blade bending plates on both sides of the central vertical plate. Two matching second aeration holes are also provided on the tail plate on both sides of the central vertical plate. The first aeration hole assembly is located below the highest point of the arc top of the blade bending plate, and multiple first aeration hole assemblies are provided on the blade bending plate along the radial direction; the openings of the first aeration hole assembly are set to be inclined downward at 2°-5° along the horizontal direction. A support plate is provided at one end of the front plate and at the bottom of the flat bottom plate, which is fixedly connected to the main shaft of the stirring paddle. A support plate reinforcing rib is also provided at the bottom of the support plate where it is fixedly connected to the main shaft of the stirring paddle. A blade reinforcing rib is also provided on the upper side wall of the blade bending plate, which is fixedly connected to the main shaft of the stirring paddle. The overall structure of the stirring and turning impeller is made of plates of different thicknesses. The impeller bending plate is a thick plate with a thickness of 10mm-20mm. The thickness of the bottom plate is 0.6-1 times the thickness of the impeller bending plate, and the thickness of the middle vertical plate is 0.5 times the thickness of the impeller bending plate. The thickness of the front plate, tail plate and spiral blade is 0.2-0.5 times the thickness of the impeller bending plate. The front plate is provided with an air inlet, and the tail plate is provided with a second aeration hole with a smaller diameter than the air inlet.

2. The arc-shaped cross-section stirring and tumbling impeller according to claim 1, characterized in that, The stirring and turning blades are made of corrosion-resistant stainless steel.

3. The arc-shaped cross-section stirring and tumbling impeller according to claim 1, characterized in that, The blade bending plate and the flat base plate are fixedly connected by seamless welding, and the bottom of the flat base plate is also fixed to the support plate reinforcing rib by welding. The front plate, tail plate, and intermediate vertical plate are also fixed inside the stirring and tumbling blades by seamless welding.

4. The method of using an arc-shaped cross-section stirring and tumbling impeller according to any one of claims 1-3, characterized in that, Multiple stirring and tumbling blades are axially distributed on a single stirring paddle shaft and used in combination.

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