A type of split-flow concrete mixing blade
By using the guide channel and sub-blade design of the diverted concrete mixing blades, the problems of mixing uniformity and shaft seizing are solved, achieving self-cleaning and efficient mixing, improving concrete quality and reducing energy consumption.
Patent Information
- Application Number
- CN202522427021.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-11-17
AI Technical Summary
In existing concrete mixing equipment, it is difficult to guarantee the uniformity of mixing, and there are dead zones in the flow and shaft binding phenomena, resulting in high energy consumption, complicated cleaning, and poor mixing quality.
The concrete mixing blades are designed with a flow field coupling between the guide channel and the sub-blades to form a directional adsorption jet, eliminating dead zones and achieving self-cleaning and multi-dimensional mixing. Combined with wear-resistant plates, the service life is extended.
It significantly improves the uniformity and fluidity of concrete mixing, reduces energy consumption, extends the service life of equipment, and reduces maintenance costs.
Smart Images
Figure CN224940247U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of impeller mixers, specifically relating to a diversion type concrete mixing blade. Background Technology
[0002] Concrete mixers are key machines in the construction of buildings, roads, bridges and other infrastructure. The performance of their core working component, the mixing blades, directly determines the mixing quality, production efficiency and equipment operating costs of the concrete.
[0003] Currently, most mainstream mixing equipment on the market adopts a single inclined blade or curved blade structure. These blades use rotation to shear and convect the concrete mixture (including cement, aggregates, water, and admixtures). However, in practical applications, these traditional blade structures have gradually revealed many inherent defects: First, mixing uniformity is difficult to guarantee. The material flow field generated by a single blade structure is unidirectional, with kinetic energy concentrated in the peripheral area, resulting in a significant flow dead zone in the central area of the mixing drum, especially around the mixing shaft, severely affecting the final mechanical properties and homogeneity of the concrete. Second, shaft-clamping is prominent, affecting normal equipment operation. For high-viscosity or low-slump concrete mixtures, materials easily adhere to the mixing shaft and gradually accumulate, forming a solid shaft-clamping layer. This phenomenon not only exacerbates the operating load on the mixing shaft, leading to increased energy consumption, but also prevents the material near the shaft from being mixed, creating potential quality problems. Furthermore, cleaning is cumbersome and affects continuous production. Therefore, those skilled in the art have been seeking a new mixing blade structure that can fundamentally improve flow field distribution, enhance wear resistance, and reduce energy consumption.
[0004] Therefore, it is particularly necessary to develop a well-designed, uniformly mixing, diversion-type concrete mixing blade. Utility Model Content
[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a diversion type concrete mixing blade.
[0006] To achieve the above objectives, the technical solution of this utility model is: a diversion type concrete mixing blade, including a main blade, a blade base fixedly installed at one end of the main blade, a plurality of sub-blades fixedly installed on the side of the main blade, a guide groove is provided on the side of the main blade near the sub-blades, one side of the sub-blades is recessed, the cross-section of the sub-blades is an airfoil-shaped structure, and one end of the guide groove is in fluid communication with the recessed side of the sub-blades.
[0007] Through the above technical solution: the special cross-sectional shape of the sub-blade causes a local low-pressure area to form due to the inward concavity of its back side during rotation caused by flow field coupling. The guide channel can accurately guide the high-speed material flow to the concave surface of the sub-blade, guiding the material to flow smoothly over the blade surface, reducing resistance, and generating micro-turbulence to enhance mixing. At this time, the Venturi adsorption effect will be generated, which will engulf the material that is stuck to the shaft into the material that is rotating with the shaft, effectively solving the shaft-clamping phenomenon in the concrete mixing process, fundamentally solving the problem of material adhesion on the shaft surface, making the mixing more thorough and complete. At the same time, the smooth coupling reduces turbulence, significantly reduces the internal flow resistance of the system, and optimizes energy consumption.
[0008] As a further embodiment of this utility model, the cross-section of the guide channel is an arc-shaped structure.
[0009] Through the above technical solutions: the guide channels can optimize the hydrodynamic characteristics of materials flowing over the blade surface, reduce macroscopic eddies and pressure difference resistance, thereby reducing stirring resistance. At the same time, these guide channels can generate tiny eddies, further enhancing the micro-mixing of materials, better breaking up cement particle clumps, and making the concrete finer; the arc-shaped cross-section has no sharp edges, resulting in minimal fluid resistance, smoothest material flow, and less likelihood of stress concentration leading to cracks.
[0010] As a further embodiment of this utility model, the ratio of the depth to the width of the guide groove is between 1:2 and 1:3.
[0011] The above technical solutions demonstrate that: if the ratio is too small, the flow guiding effect will be insignificant; if the ratio is too large, it will easily cause material jamming and weaken the blade strength; the range of 1:2 to 1:3 is the optimal range verified by fluid simulation or experiments, which can achieve the best balance between flow guiding effect and structural strength.
[0012] As a further aspect of this utility model: there is an angle between the sub-blade and the main blade, the angle being 30°-60°, and the closer the sub-blade is to the blade base, the smaller the angle.
[0013] With the above technical solution: the tip of the sub-blade points to the blade base, the angle between the main blade and the sub-blade gradually increases, and the closer to the blade base, the smaller the angle becomes. The sub-blade can form a low-pressure flow area with enough space, without generating large resistance, which can significantly achieve the diversion effect, solve the shaft gripping phenomenon, reduce overall energy consumption, and eliminate flow dead zones.
[0014] As a further embodiment of this invention, a wear-resistant sheet is fixedly installed on the side of the main blade.
[0015] Through the above technical solution, the wear-resistant pads are detachably fixed to the tip and leading edge of the main blade by bolts or other means, achieving a precise protection effect on the main blade, greatly extending the service life of the main blade, and minimizing maintenance costs and downtime.
[0016] Compared with the prior art, the present invention has the following beneficial effects: By coupling the flow field between the guide channel and the suction surface of the sub-blades, a directional, high-speed adsorption jet is actively generated. This jet, like an airflow sweeping, continuously and effectively peels off and carries away the material adhering to the stirring shaft and the root of the blades, achieving self-cleaning of the shaft. The sub-blades divide the mainstream material propelled by the main blades into one or more secondary streams, forming multi-directional and complex convection and shearing, completely eliminating dead zones, preventing shaft seizing, and achieving multi-dimensional, high-intensity mixing of materials without dead zones, significantly improving concrete quality.
[0017] The microscale eddies generated at the edge of the guide channel and by the jet itself greatly enhance the shearing and diffusion of materials, effectively breaking up cement particle agglomerates and significantly improving the uniformity of micro-mixing. At the same time, the guide channel structure effectively suppresses the generation of large-scale, high-energy-consuming eddies behind the blades, significantly reducing shape resistance. Under the premise of achieving the same or even better mixing effect, the required driving power is lower, resulting in significant energy saving. Attached Figure Description
[0018] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is the right view of the utility model; Figure 3 yes Figure 2 Sectional view along the AA direction.
[0019] Explanation of reference numerals in the attached figures: 1. Main blade; 2. Blade base; 3. Sub-blade; 4. Guide groove; 5. Wear-resistant plate. Specific Implementation
[0020] The following will be combined with the appendix Figures 1-3 The technical solution of this utility model has been clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0021] See appendix Figures 1-3A diversion type concrete mixing blade includes a main blade 1, a blade base 2 fixedly installed at one end of the main blade 1, and several sub-blades 3 fixedly installed on one side of the main blade 1.
[0022] In this embodiment: the blade base 2 is provided with mounting holes. The stirring blade in this application is fixedly installed on the stirring shaft through the mounting holes on the blade base 2. During installation, the side of the main blade 1 with the sub-blade 3 fixed is tilted forward. The main blade 1 is responsible for driving most of the material to rotate and mix.
[0023] See appendix Figures 1-3 Several sub-blades 3 are fixedly installed on the side of the main blade 1. One side of the sub-blade 3 is concave. The cross-section of the sub-blade 3 is an airfoil structure. There is an angle between the sub-blade 3 and the main blade 1. The angle is 30°-60°. The closer the sub-blade 3 is to the blade base 2, the smaller the angle.
[0024] In this embodiment, the angle between the sub-blade 3 and the main blade 1 gradually increases from the blade base 2 towards the end of the main blade 1, so that different parts of the sub-blade 3 can adapt to the working conditions of different radius areas in the mixing drum. It gently cleans the shaft center near the rotating shaft and strongly stirs the middle part at the end of the main blade 1, achieving uniform and efficient stirring throughout the entire area. The airfoil structure of the sub-blade 3 has one side protruding and one side concave. The concave side faces the blade base 2. During stirring, the concave side will form a low-pressure flow area. This low-pressure flow area will generate a suction force on the material clinging to the shaft, causing some of the material clinging to the shaft to leave the rotating shaft and flow into the low-pressure flow area. Subsequently, it will be dispersed and stirred by the main blade 1. The sub-blade 3 actively intervenes in the flow field by dividing the material flow, realizing anti-shaft clinging and self-cleaning of the rotating shaft.
[0025] See appendix Figures 1-3 A guide groove 4 is provided on the side of the main blade 1 near the sub-blade 3. One end of the guide groove 4 is in fluid communication with the concave side of the sub-blade 3. The cross-section of the guide groove 4 is an arc-shaped structure, and the ratio of the depth to the width of the guide groove 4 is between 1:2 and 1:3.
[0026] In this embodiment, one end of the guide channel 4 is close to the blade base 2 and also connected to the low-pressure flow area of the sub-blade 3. It guides the material that is far from the low-pressure flow area of the sub-blade 3, further ensuring the anti-shaft effect. The guide channel 4 can optimize the hydrodynamic characteristics of the material flowing over the blade surface, reduce macroscopic eddies and pressure difference resistance, thereby reducing the stirring resistance. At the same time, these guide channels 4 can generate tiny eddies, further enhancing the micro-mixing of the material, better breaking up cement particle clumps, and making the concrete finer. The guide channel 4 optimizes the flow field at the micro level and reduces energy consumption.
[0027] Referring to the attached diagram, a wear-resistant plate 5 is fixedly installed on the side of the main blade 1.
[0028] In this embodiment, the wear-resistant sheet 5 is detachably fixed to the tip and leading edge of the main blade 1 by bolts or other means. When wear occurs, only the machine needs to be stopped to replace the wear-resistant sheet 5 to continue construction, thereby achieving a precise protection effect on the main blade, greatly extending the service life of the main blade 1, and minimizing maintenance costs and shortening downtime.
[0029] During use, the main blade 1 is fixedly installed on the mixing shaft. When the mixing shaft rotates, it drives the main blade 1 to rotate. The main blade 1 pushes the concrete material to rotate inside the mixing drum. During the rotation of the sub-blade 3, the surface near the main blade 1 is concave, forming a Venturi adsorption effect. The fluid with a lower linear velocity near the mixing shaft is attracted and flows towards the back flow area of the sub-blade 3. The guide groove cooperates with the sub-blade 3 to guide more material near the mixing shaft to the back flow area of the sub-blade 3. After the material enters the back flow area of the sub-blade 3, it is pushed and stirred by the main blade 1, which fundamentally solves the problem of shaft seizing, breaks the flow dead zone, and makes the mixing more uniform.
[0030] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and inventive features disclosed herein.
Claims
1. A split-flow concrete mixing blade comprising a main blade (1), characterized in that: One end of the main blade (1) is fixedly mounted with a blade base (2), and several sub-blades (3) are fixedly mounted on the side of the main blade (1). A guide groove (4) is opened on the side of the main blade (1) near the sub-blade (3). One side of the sub-blade (3) is recessed. The cross-section of the sub-blade (3) is an airfoil structure. One end of the guide groove (4) is in fluid communication with the recessed side of the sub-blade (3).
2. A split concrete mixing blade according to claim 1, wherein: The cross-section of the guide channel (4) is an arc-shaped structure.
3. A split concrete mixing blade according to claim 1, wherein: The ratio of the depth to the width of the guide groove (4) is between 1:2 and 1:
3.
4. A split concrete mixing blade according to claim 1, wherein: There is an angle between the sub-blade (3) and the main blade (1), the angle being 30°-60°. The closer the sub-blade (3) is to the blade base (2), the smaller the angle.
5. A split concrete mixing blade according to claim 1, wherein: A wear-resistant plate (5) is fixedly installed on the side of the main blade (1).