Double-layer blade spiral mixing structure of concrete mixer
By setting a double-layer blade design with serrated edges and elastic buffer pads on the spiral blades, the problems of insufficient self-cleaning capacity and uneven stirring of traditional stirring structures are solved, efficient self-cleaning and uniform mixing are achieved, and equipment life is extended.
Patent Information
- Application Number
- CN202422361573.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-27
AI Technical Summary
During the stirring process, the traditional spiral stirring structure is prone to materials sticking to the inner wall of the stirring drum, resulting in insufficient self-cleaning capacity and uneven stirring. Long-term use will cause wear of the blades and barrel walls, increasing maintenance costs and downtime.
The double-layer blade design is adopted, and the spiral blades are equipped with serrated edges and elastic cushions. The serrated edges are used to scrape residues, the elastic cushions reduce wear, and the through holes are used for gas or liquid circulation, optimizing the stirring trajectory.
It improves the self-cleaning ability of the mixer, reduces the frequency of manual cleaning, extends the service life of the equipment, ensures even mixing of materials, and reduces maintenance costs.
Smart Images
Figure CN223211627U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of concrete mixers, and in particular relates to a double-layer blade spiral stirring structure of a concrete mixer. Background Art
[0002] Concrete mixers are an essential piece of machinery in construction, widely used in various construction projects, including roads, bridges, and houses. Their primary function is to thoroughly mix various raw materials, such as cement, sand, gravel, and water, during the mixing process to form a uniform concrete slurry. The quality of concrete directly impacts the structural safety and service life of a building, so efficient concrete mixers are crucial for improving concrete quality. Concrete mixers typically consist of a mixing drum, drive unit, transmission, control system, and other components. The mixing drum is one of the core components, housing a mixing mechanism. Common mixing mechanisms include single-shaft, dual-shaft, and spiral. The spiral mixing mechanism is widely used in modern concrete mixers due to its simple structure, excellent mixing performance, and ease of maintenance.
[0003] The core component of a spiral mixing mechanism is the spiral blade. Its characteristic feature is that its spiral shape propels the material up and down the drum wall during rotation, thereby achieving mixing. The spiral blade is typically fixed to one or more support shafts, which are driven by a motor. During rotation, the spiral blade not only propels the material forward but also creates a spiral path that causes the material to tumble and mix within the drum, thereby achieving the desired mixing effect. Despite the numerous advantages of a spiral mixing mechanism, traditional spiral mixing mechanisms also have some significant drawbacks in practice. Due to the stickiness of the material, traditional spiral mixing mechanisms easily leave residue on the inner wall of the mixing drum during mixing. This residue not only impairs mixing performance but also accumulates over time, reducing the internal volume of the drum and even causing uneven mixing. Removing this residue often requires manual cleaning after the machine is shut down, increasing maintenance costs and downtime, and reducing production efficiency. Over long-term use, repeated friction between the spiral blades and the inner wall of the mixing drum causes increased wear on both the blades and the drum wall. This wear problem is particularly prominent when mixing high-viscosity concrete or concrete containing a large amount of sand and gravel. Damage to the spiral blades or cylinder requires replacement or repair, which not only increases maintenance costs but can also affect the mixer's normal operation. While traditional spiral mixing mechanisms provide basic mixing, in some cases, especially with high-density or high-viscosity materials, mixing efficiency needs improvement. Materials are prone to stratification during mixing, especially at low speeds or with high viscosity materials, making it difficult to ensure uniform distribution of all ingredients. Utility Model Content
[0004] In view of this, the utility model provides a double-blade spiral mixing structure for a concrete mixer, which solves the drawbacks of insufficient self-cleaning ability and uneven mixing of traditional mixing structures and improves the self-cleaning ability.
[0005] The utility model is achieved in this way:
[0006] The utility model provides a double-blade spiral stirring structure of a concrete mixer, which includes a spiral blade and a support shaft. The spiral blade is provided with a serrated edge, and the serrated edge is used to scrape concrete residues adhering to the wall of the mixer barrel when the spiral blade rotates. The spiral blade is fixedly mounted on the support shaft, and an angle is formed between the spiral blade and the support shaft. A plurality of through holes are provided on the surface of the spiral blade, and the through holes are used to allow air or liquid to pass through. The spiral blade is equidistantly distributed along the length direction of the support shaft. An elastic buffer pad is sleeved on the top end of the serrated edge, and the elastic buffer pad is arranged between the serrated edge and the inner wall of the mixer barrel.
[0007] The technical effects of the double-blade spiral mixing structure of a concrete mixer provided by the utility model are as follows: reducing the frequency of manual cleaning, improving the self-cleaning ability of the mixer, and extending the service life of the equipment. The material hardness of the serrated edge is greater than or equal to the material hardness of the spiral blade. The elastic buffer pad is made of a material with certain elasticity and wear resistance, such as polyurethane, rubber, etc. During the rotation process, the elastic support pad can contact the cylinder wall and apply appropriate pressure to scrape off the concrete residue adhering to the cylinder wall. The buffering effect of the elastic support pad reduces the chance of the serrations directly contacting the cylinder wall, thereby avoiding damage to the cylinder wall.
[0008] On the basis of the above technical solution, the double-blade spiral mixing structure of a concrete mixer of the present invention can also be improved as follows:
[0009] Wherein, the support shaft is provided with a pipeline for conveying gas or liquid to the through hole, and the pipeline is connected to an external gas or liquid supply device.
[0010] Furthermore, the serration angle of the serrated edge ranges from 15° to 45°.
[0011] The serration angle is the angle between the inclined surface of the serration and the reference plane of the spiral blade edge. A larger serration angle provides stronger scraping force and is suitable for self-cleaning at low rotation speeds; a smaller serration angle is suitable for self-cleaning at high rotation speeds.
[0012] The serration angle is chosen to ensure that the serrations can effectively scrape concrete residue adhering to the cylinder wall as the spiral blade rotates. An angle that is too small may prevent the serrations from effectively contacting and scraping the residue; an angle that is too large may cause the serrations to wear prematurely or fail to maintain sufficient contact pressure.
[0013] Furthermore, the serration height of the serration edge ranges from 2 mm to 5 mm.
[0014] The beneficial effects of adopting the above-mentioned improvement scheme are: while ensuring the strength of the saw teeth, its scraping ability is improved and it is adaptable to concrete of different viscosities.
[0015] Furthermore, the angle between the spiral blade and the support shaft ranges from 10° to 30°.
[0016] The beneficial effect of adopting the above-mentioned improved scheme is that the spiral blades are evenly distributed along the length of the support shaft (4), ensuring that the material can be evenly stressed during the entire mixing process. The angle between each spiral blade and the support shaft generally ranges from 10° to 30°, ensuring that the material can form a good spiral upward or downward motion during the mixing process. A larger angle can optimize the spiral upward trajectory of the material during the mixing process, which is suitable for high-viscosity concrete; a smaller angle can improve the mixing uniformity.
[0017] Furthermore, the through holes are distributed on the outer edge of the spiral blade and do not cover the inner side of the spiral blade, the inner side is within the range of 0% to 30% of the width of the spiral blade, and the outer edge is within the range of 70% to 100% of the width of the spiral blade.
[0018] The outer edge refers to the part of the spiral blade close to the mixer barrel wall, that is, the side of the spiral blade farthest from the central axis. This part is usually the area where the spiral blade contacts the barrel wall most frequently and is also where materials are most likely to adhere.
[0019] Inner side: refers to the part of the spiral blade close to the central axis, that is, the side of the spiral blade farther from the cylinder wall. This part is usually responsible for pushing the material toward the center or outward.
[0020] Furthermore, the through holes are arranged in a straight line or distributed in a spiral along the length direction of the spiral blade, and are distributed at equal intervals along the spiral direction of the spiral blade. The diameter of the through holes ranges from 0.5 mm to 2 mm.
[0021] Furthermore, the serrated edge is fixed to the outer edge of the spiral blade by welding or riveting.
[0022] Furthermore, the support shaft is connected to the mixer barrel through bearings, and the bearings are located at both ends of the spiral blades.
[0023] Furthermore, the edge of the through hole is rounded, and the rounding radius is 0.2mm to 0.5mm.
[0024] Compared with the prior art, the double-blade spiral mixing structure of a concrete mixer provided by the present invention has the following beneficial effects:
[0025] Improve self-cleaning ability:
[0026] Serrated edge design: By setting a serrated edge on the edge of the spiral blade, this utility model can scrape off the concrete residue adhering to the cylinder wall during the mixing process. The serrated edge design allows the blade to contact the cylinder wall during rotation, utilizing the scraping effect of the serrations to effectively remove the residue on the cylinder wall, reducing the frequency of manual cleaning;
[0027] Elastic support pad: In order to prevent the serrated edge from damaging the cylinder wall, the utility model further provides an elastic support pad. The elastic support pad is made of wear-resistant material and has a certain elasticity. It can buffer the direct contact between the serrated edge and the cylinder wall, reduce wear and extend the service life of the cylinder wall.
[0028] Reduce wear and extend service life:
[0029] Sawtooth hardness and shape: The hardness of the sawtooth edge is higher than that of the spiral blade, preferably 1.5 times that of the spiral blade, to ensure that the sawtooth can maintain a good scraping effect after long-term use. The shape of the sawtooth edge is designed as an isosceles triangle, ensuring that it can provide sufficient scraping force during the scraping process without causing damage to the cylinder wall;
[0030] Elastic support pad: The thickness of the elastic support pad is designed to be 2mm to 5mm, which can ensure sufficient pressure during the scraping process without damaging the cylinder wall. The setting of the elastic support pad prolongs the service life of the cylinder wall and reduces maintenance costs.
[0031] Improve mixing effects:
[0032] Through-hole design: Through-holes are opened on the surface of the spiral blades, and air or liquid is passed through these holes to generate bubbles or water flow, promoting the mixing of materials. The diameter of the through-holes is designed to be 0.5mm to 2mm, and the distribution density is 5 to 20 per square centimeter, ensuring that sufficient bubbles or water flow can be generated during the mixing process, improving the mixing uniformity of the materials;
[0033] Edge treatment of through-holes: In order to prevent materials from clogging at the edges of through-holes, the utility model performs chamfering on the edges of through-holes with a chamfering radius of 0.2mm to 0.5mm, ensuring that the through-holes will not fail due to material clogging during use;
[0034] Optimize stirring trajectory:
[0035] The angle between the spiral blade and the support shaft is designed to be 10° to 30°, which optimizes the spiral rise or fall trajectory of the material during the mixing process and improves the mixing uniformity.
[0036] Width of spiral blade: The width W of the spiral blade is designed to be one-third to one-half of the inner diameter D of the mixer barrel, ensuring that it can provide sufficient mixing area during the mixing process without taking up too much space and affecting the mixing efficiency;
[0037] Easy maintenance and replacement:
[0038] Installation of serrated edge and elastic support pad: The utility model designs the installation method of serrated edge and elastic support pad, so that they are fixed on the spiral blade by welding or snapping, which is convenient for disassembly and replacement;
[0039] Through-hole processing technology: This utility model adopts laser punching or precision drilling technology to process through-holes, ensuring the accuracy and distribution uniformity of the through-holes, improving processing quality and service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0041] Figure 1 This is an example diagram of a double-blade spiral mixing structure of a concrete mixer;
[0042] Figure 2 A top perspective view of a first embodiment of a double-blade spiral mixing structure of a concrete mixer;
[0043] Figure 3 A top perspective view of a second embodiment of a double-blade spiral mixing structure of a concrete mixer;
[0044] Figure 4 for Figure 3 Enlarged view of part A;
[0045] In the accompanying drawings, the components represented by the reference numerals are as follows:
[0046] 10. Spiral blade; 11. Serrated edge; 111. Elastic buffer pad; 12. Through hole; 20. Support shaft. DETAILED DESCRIPTION
[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.
[0048] like Figure 1 、 Figure 2 As shown, a first embodiment of a double-blade spiral mixing structure of a concrete mixer provided by the utility model is shown. In this embodiment, it includes a spiral blade 10 and a support shaft 20. The spiral blade 10 is provided with a serrated edge 11. The serrated edge 11 is used to scrape off concrete residues adhering to the wall of the mixer barrel when the spiral blade 10 rotates. The spiral blade 10 is fixedly mounted on the support shaft 20, and an angle is formed between the spiral blade 10 and the support shaft 20. A plurality of through holes 12 are provided on the surface of the spiral blade 10. The through holes 12 are used to allow air or liquid to pass through. The spiral blade 10 is equidistantly distributed along the length direction of the support shaft 20. An elastic buffer pad 111 is provided at the top end of the serrated edge 11. The elastic buffer pad 111 is arranged between the serrated edge 11 and the inner wall of the mixer barrel.
[0049] Fixing method of spiral blade and support shaft:
[0050] Welding: The spiral blades are fixed to the support shaft by welding, ensuring a firm connection between the two.
[0051] Bolted connection: The spiral blades are fixed to the support shaft by bolts, which is easy to disassemble and maintain.
[0052] Key connection: The spiral blades are fixed to the support shaft by keys to ensure that there is no relative sliding during rotation.
[0053] The elastic support pad is installed at the front end of the serrated edge, closely fitting the edge. The thickness of the elastic support pad is designed to be between 2mm and 5mm. The elastic support pad is designed to match the serrated edge, typically in the form of a long strip or a contour that matches the serrated shape. The elastic support pad is secured to the serrated edge using adhesive, clips, or screws.
[0054] In the above technical solution, a pipeline for conveying gas or liquid to the through hole 12 is provided on the support shaft 20, and the pipeline is connected to an external gas or liquid supply device.
[0055] The pipeline is integrated inside the support shaft and extends from one end of the support shaft to the other end, ensuring that the gas or liquid can be evenly transported to each through hole on the spiral blade.
[0056] The pipes are connected to the through-holes of the spiral blades through branch lines inside the support shaft. The branch lines can be long, narrow pipes or conduits to ensure that the gas or liquid is evenly delivered to each through-hole. The pipes are designed to be built into the centerline of the support shaft and connect to the through-holes of the spiral blades through small holes in the shaft.
[0057] Furthermore, in the above technical solution, the serration angle of the serration edge 11 is in the range of 15°. A smaller serration angle can ensure that the serration can provide sufficient scraping force during high-speed rotation while reducing wear on the cylinder wall.
[0058] Furthermore, in the above technical solution, the serration height of the serration edge 11 is in the range of 2 mm. A lower serration height can reduce the contact area between the serration and the cylinder wall, thereby reducing wear and extending the service life.
[0059] Furthermore, in the above technical solution, the angle between the spiral blade 10 and the support shaft 20 is in the range of 10°. A smaller angle can optimize the spiral upward trajectory of the material during the mixing process and improve the mixing uniformity.
[0060] Furthermore, in the above technical solution, the through holes 12 are distributed in the outer edge portion of the spiral blade 10 and do not cover the inner side of the spiral blade 10. The inner side is in the range of 0% to 30% of the width of the spiral blade 10, and the outer edge portion is in the range of 70% to 100% of the width of the spiral blade 10.
[0061] Furthermore, in the above technical solution, the through holes 12 are arranged in a straight line or distributed in a spiral along the length direction of the spiral blade 10 and are evenly spaced along the spiral direction of the spiral blade 10. The diameter of the through holes 12 ranges from 0.5 mm to 2 mm.
[0062] Furthermore, in the above technical solution, the serrated edge 11 is fixed to the outer edge of the spiral blade 10 by welding or riveting.
[0063] Furthermore, in the above technical solution, the support shaft 20 is connected to the mixer barrel through bearings, and the bearings are located at both ends of the spiral blade 10.
[0064] Furthermore, in the above technical solution, the edge of the through hole 12 is rounded, and the rounding radius is 0.2 mm to 0.5 mm.
[0065] like Figure 1 、 Figure 3 、 Figure 4As shown, it is a second embodiment of a double-blade spiral mixing structure of a concrete mixer provided by the utility model. In this embodiment, it includes a spiral blade 10 and a support shaft 20. The spiral blade 10 is provided with a serrated edge 11. The serrated edge 11 is used to scrape off concrete residues adhering to the wall of the mixer barrel when the spiral blade 10 rotates. The spiral blade 10 is fixedly mounted on the support shaft 20, and an angle is formed between the spiral blade 10 and the support shaft 20. A plurality of through holes 12 are provided on the surface of the spiral blade 10. The through holes 12 are used to allow air or liquid to pass through. The spiral blade 10 is equidistantly distributed along the length direction of the support shaft 20. An elastic buffer pad 111 is provided at the top end of the serrated edge 11. The elastic buffer pad 111 is arranged between the serrated edge 11 and the inner wall of the mixer barrel.
[0066] Sawtooth angle: 45°. The larger sawtooth angle can provide stronger scraping force, ensuring that the residue on the cylinder wall can be effectively scraped even at low speed rotation.
[0067] Saw tooth height: 5mm. Higher saw tooth height can improve scraping ability and adapt to concrete with higher viscosity.
[0068] Number of teeth: 50 per meter. A larger number of teeth can further increase the number of scraping times per unit length and improve the self-cleaning ability.
[0069] Sawtooth edge width: 1 / 5 of the spiral blade width. A larger serrated edge width can provide a larger scraping area and improve scraping efficiency.
[0070] Tooth spacing: 20mm. Larger tooth spacing can reduce mutual interference between teeth and improve scraping efficiency.
[0071] The angle between the spiral blade and the support shaft is 30°. A larger angle can optimize the spiral upward trajectory of the material during the mixing process and improve the mixing uniformity.
[0072] Through hole diameter: 2mm. A larger through hole diameter can generate more bubbles or water flow and improve the mixing effect.
[0073] Through-hole distribution density: 20 per square centimeter. A higher through-hole distribution density can further improve the mixing effect and ensure uniform distribution of bubbles or water flow.
[0074] The angle between the spiral blade and the support shaft is 30°. A larger angle can optimize the spiral upward trajectory of the material during the mixing process and improve the mixing uniformity.
[0075] Specifically, the principle of the present utility model is:
[0076] Self-cleaning principle of serrated edge: The utility model realizes self-cleaning function by setting serrated edge on the edge of spiral blade and utilizing the scraping effect of serrated edge.
[0077] Sawtooth Angle:
[0078] The serration angle of the serrated edge is designed to be 15° to 45°, preferably 30°. During the stirring process, when the spiral blade rotates, the serrated edge contacts the cylinder wall, and the inclined surface of the serration forms a certain angle with the cylinder wall. The scraping effect of the serration is used to effectively remove the residue on the cylinder wall.
[0079] Sawtooth height and density:
[0080] The height of the serration edge is designed to be 2mm to 5mm, and the number of serrations is designed to be 20 to 50 per meter. The height and density of the serrations ensure that sufficient scraping force is provided during the mixing process without causing damage to the cylinder wall.
[0081] The spacing L between adjacent teeth on the sawtooth edge is designed to be 5mm to 20mm, ensuring that the teeth can be evenly distributed during the scraping process and improving the scraping efficiency;
[0082] Sawtooth hardness and material:
[0083] The hardness of the serrated edge is designed to be 1.5 times that of the spiral blade, ensuring that it can maintain a good scraping effect even after long-term use. The material of the serrated edge is made of high-wear-resistant alloy steel to improve its wear resistance and corrosion resistance, extending its service life;
[0084] Protection principle of elastic support pad: In order to prevent the serrated edge from damaging the cylinder wall, the utility model further provides an elastic support pad. Specifically:
[0085] Material selection:
[0086] The elastic support pad is made of polyurethane or special rubber materials, which have certain elasticity and wear resistance. These materials can not only provide sufficient elasticity to absorb impact, but also maintain good wear resistance and extend service life;
[0087] Thickness design:
[0088] The thickness of the elastic support pad is designed to be 2mm to 5mm, which can ensure sufficient pressure during the scraping process without damaging the cylinder wall. Through reasonable thickness design, the elastic support pad can effectively buffer the direct contact between the sawtooth edge and the cylinder wall, reducing wear;
[0089] Fixing method:
[0090] The elastic support pad is fixed to the serrated edge by bonding, snapping or screws to ensure that it is not easy to fall off during use. At the same time, this fixing method is easy to disassemble and replace, and facilitates daily maintenance;
[0091] Mixing principle of through-hole spiral blades: This utility model opens through-holes on the surface of the spiral blades, and uses air or liquid to pass through these holes to generate bubbles or water flow, thereby promoting the mixing of materials. Specifically:
[0092] Through hole diameter and distribution density:
[0093] The diameter of the through holes is designed to be 0.5mm to 2mm, and the distribution density is 5 to 20 per square centimeter. This design ensures that sufficient bubbles or water flow can be generated during the mixing process, improving the mixing uniformity of the materials;
[0094] The diameter and distribution density of the through holes are optimized to ensure the generation of bubbles or water flow without causing material blockage due to holes being too large or too dense.
[0095] Tilt angle of through hole:
[0096] The through-holes are designed to have an inclination angle of 0° to 30° relative to the surface of the spiral blade. This inclination allows the through-holes to better guide the flow of bubbles or water, enhancing the mixing effect.
[0097] Edge treatment of through hole:
[0098] The edges of the through-holes are rounded with a radius of 0.2mm to 0.5mm. This treatment prevents material from clogging at the edges of the through-holes, ensuring that the through-holes will not fail due to material clogging during use.
[0099] Principle of Stirring Track Optimization: This utility model optimizes the stirring track by optimizing the angle between the spiral blade and the support shaft and designing the width of the spiral blade. Specifically:
[0100] The angle between the spiral blade and the support shaft:
[0101] The angle is designed to be 10° to 30°, preferably 20°. This design optimizes the spiral upward or downward trajectory of the material during the mixing process and improves the mixing uniformity;
[0102] The optimized design of the included angle ensures that the material can form a good spiral flow during the mixing process, avoiding the occurrence of material stratification;
[0103] Width of spiral blade:
[0104] The width of the spiral blade is designed to be one-third to one-half of the inner diameter of the mixer barrel, preferably one-half. This design ensures that it provides sufficient mixing area during the mixing process without taking up too much space and affecting the mixing efficiency.
[0105] The optimized design of the spiral blade width ensures that the materials can be fully mixed during the mixing process, improving the overall performance of the mixer.
Claims
1. A double-blade spiral mixing structure for a concrete mixer, characterized in that: The invention comprises a spiral blade (10) and a support shaft (20), wherein the spiral blade (10) is provided with a serrated edge (11), and the serrated edge (11) is used to scrape concrete residues adhering to the wall of the mixer barrel when the spiral blade (10) rotates, and the spiral blade (10) is fixedly mounted on the support shaft (20), and an angle is formed between the spiral blade (10) and the support shaft (20), and a plurality of through holes (12) are provided on the surface of the spiral blade (10), and the through holes (12) are used to allow air or liquid to pass through, and the spiral blade (10) is equidistantly distributed along the length direction of the support shaft (20), and an elastic buffer pad (111) is provided on the top end of the serrated edge (11), and the elastic buffer pad (111) is arranged between the serrated edge (11) and the inner wall of the mixer barrel.
2. The double-blade spiral stirring structure of a concrete mixer according to claim 1, characterized in that: The support shaft (20) is provided with a pipeline for conveying gas or liquid to the through hole (12), and the pipeline is connected to an external gas or liquid supply device.
3. The double-blade spiral stirring structure of a concrete mixer according to claim 2, characterized in that: The sawtooth angle of the sawtooth edge (11) ranges from 15° to 45°.
4. The double-blade spiral stirring structure of a concrete mixer according to claim 3, characterized in that: The serration height of the serration edge (11) ranges from 2 mm to 5 mm.
5. The double-blade spiral stirring structure of a concrete mixer according to claim 4, characterized in that: The angle between the spiral blade (10) and the support shaft (20) ranges from 10° to 30°.
6. The double-blade spiral stirring structure of a concrete mixer according to claim 5, characterized in that: The through holes (12) are distributed on the outer edge of the spiral blade (10) and do not cover the inner side of the spiral blade (10), wherein the inner side is within a range of 0% to 30% of the width of the spiral blade (10), and the outer edge is within a range of 70% to 100% of the width of the spiral blade (10).
7. The double-blade spiral stirring structure of a concrete mixer according to claim 6, characterized in that: The through holes (12) are arranged in a straight line or distributed in a spiral along the length direction of the spiral blade (10), and are distributed at equal intervals along the spiral direction of the spiral blade (10). The diameter of the through holes (12) ranges from 0.5 mm to 2 mm.
8. The double-blade spiral stirring structure of a concrete mixer according to claim 7, characterized in that: The serrated edge (11) is fixed to the outer edge of the spiral blade (10) by welding or riveting.
9. The double-blade spiral stirring structure of a concrete mixer according to claim 8, characterized in that: The support shaft (20) is connected to the mixer barrel through bearings, and the bearings are located at both ends of the spiral blade (10).
10. The double-blade spiral stirring structure of a concrete mixer according to claim 9, characterized in that: The edge of the through hole (12) is rounded, and the rounding radius is 0.2 mm to 0.5 mm.