Pre-mixed concrete mixing device

Abstract

The application relates to a premixed concrete mixing device and relates to the technical field of concrete equipment. The premixed concrete mixing device comprises a mixing drum, a mixing shaft and multiple groups of mixing blades. The inner wall of the mixing drum is provided with multiple auxiliary spoiler plates. The cross section of the auxiliary spoiler plate is in an asymmetric streamline structure. The side of the auxiliary spoiler plate facing the rotating direction of the mixing blade is a gently convex flow guide surface, and the side of the auxiliary spoiler plate facing away from the rotating direction of the mixing blade is a steep spoiler surface. The application mixes the concrete aggregates in the mixing drum through the mixing blades. The flow guide surface of the auxiliary spoiler plate faces the rotating direction of the mixing blade. The concrete material is naturally guided to the central area of the mixing drum along the curved surface, so that energy invalid dissipation is avoided. The high-speed material flow impacts the steep spoiler surface, forms high-intensity turbulence under the action of the sharp turning of the curved surface, and the aggregate clusters are forced to be broken under the action of the shearing force. Finally, the mixing dead zone is eliminated, the energy consumption is reduced, and the aggregate breaking efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of concrete equipment, and in particular to ready-mixed concrete mixing equipment. Background Technology

[0002] Ready-mixed concrete mixing equipment is widely used in the construction industry, and its core mixing performance directly affects concrete quality and production efficiency. Currently, horizontal shaft mixers mainly achieve mixing by rotating blades driven by a mixing shaft, but several technical bottlenecks exist in practical applications.

[0003] Traditional mixing drums have smooth cylindrical inner walls, lacking effective flow-disrupting structures. Materials, propelled by the blades, easily form a fixed flow path. This flow field creates dead zones near the drum wall, making it difficult for cement slurry and aggregates to mix thoroughly, resulting in decreased mixing uniformity. To achieve the required homogeneity for construction, mixing time must be extended, significantly increasing energy consumption and production costs.

[0004] Existing technologies attempt to improve flow by adding fixed baffles to the cylinder wall, but conventional rectangular or symmetrical airfoil baffle structures are unreasonable. When materials impact the baffles, disordered reflected flow is generated, and some energy is converted into ineffective eddies rather than effective shear force, resulting in low aggregate crushing efficiency.

[0005] Therefore, a new type of turbulence structure is urgently needed to eliminate the mixing dead zone while reducing energy consumption and improving aggregate crushing efficiency. Utility Model Content

[0006] In order to eliminate the mixing dead zone, reduce energy consumption, and improve aggregate crushing efficiency, this application provides a ready-mixed concrete mixing device.

[0007] The ready-mixed concrete mixing device provided in this application adopts the following technical solution: A ready-mixed concrete mixing device includes a mixing drum, a mixing shaft horizontally arranged inside the mixing drum, and multiple sets of mixing blades installed on the mixing shaft. Multiple auxiliary baffles are arranged circumferentially on the inner wall of the mixing drum. The length direction of the auxiliary baffles is parallel to the axis of the mixing shaft. The cross-section of the auxiliary baffles has an asymmetrical streamlined structure. The side of the auxiliary baffle facing the direction of rotation of the mixing blades is a gently convex guide surface, and the side of the auxiliary baffle facing away from the direction of rotation of the mixing blades is a steep baffle surface.

[0008] By adopting the above technical solution, the mixing shaft mixes the concrete aggregate in the mixing drum through the mixing blades. The guide surface of the auxiliary baffle plate faces the rotation direction of the mixing blades. When the concrete material is pushed by the blades and comes into contact with the gently raised guide surface, it is naturally guided along the curved surface to the central area of ​​the mixing drum, avoiding ineffective energy dissipation. The high-speed material flow impacts the steep baffle surface, and the high-intensity turbulence is formed by the sharp turning of the curved surface. The aggregate agglomerates are forcibly broken under the action of shear force, which ultimately eliminates the mixing dead zone, reduces energy consumption, and improves the aggregate crushing efficiency.

[0009] Furthermore, the auxiliary baffles are arranged in multiple rows along the axial direction of the mixing drum, with adjacent rows of auxiliary baffles being staggered.

[0010] By adopting the above technical solution, the circumferential multi-row layout covers the mixing blind zone, and the staggered design allows the material to be sheared a second time by the rear row after flowing into the front row auxiliary baffles, which ultimately improves the axial mixing uniformity and shortens the mixing time.

[0011] Furthermore, the radius of curvature R1 of the guiding surface is greater than the radius of curvature R2 of the turbulence surface, and satisfies R1≥2R2.

[0012] By adopting the above technical solutions, the large curvature of the guiding surface reduces fluid separation loss, and the small curvature of the turbulence surface enhances the streamline curvature effect, forming a high-pressure shear layer, which ultimately improves energy utilization and aggregate crushing efficiency.

[0013] Furthermore, the height of the auxiliary baffle is 1 / 15 to 1 / 10 of the diameter of the mixing drum, and the length of the auxiliary baffle is 1 / 4 to 1 / 3 of the length of the mixing drum.

[0014] By adopting the above technical solution, the height of the auxiliary spoiler is 1 / 15-1 / 10 of the cylinder diameter, ensuring that the disturbance depth penetrates the material layer, and its length is 1 / 4-1 / 3 of the cylinder length to match the range of the main flow field, ultimately ensuring the lifting speed of the bottom material.

[0015] Furthermore, the auxiliary baffle is detachably mounted on a pre-set mounting base inside the mixing drum via fixing bolts.

[0016] By adopting the above technical solution, the mounting base is welded to the inner wall of the mixing drum, and the auxiliary baffle is locked to the mounting base by fixing bolts, thereby improving the maintenance efficiency of the auxiliary baffle.

[0017] Furthermore, the surface of the auxiliary baffle is covered with a replaceable wear-resistant ceramic liner, and a settling hole is provided on the side of the auxiliary baffle near the side wall of the mixing drum. A locking bolt that is threadedly connected to the inside of the wear-resistant ceramic liner is provided in the settling hole.

[0018] By adopting the above technical solution, the wear-resistant ceramic liner and the locking bolt are threaded together to form a closed anti-erosion interface. At the same time, when the auxiliary baffle is pressed against the wall of the mixing drum, the head of the locking bolt is sealed and hidden through the countersink hole. This ultimately improves the locking effect of the wear-resistant ceramic liner and the auxiliary baffle and facilitates maintenance and replacement.

[0019] Furthermore, a spring washer is engaged with the locking bolt near the bottom of the auxiliary spoiler. When the auxiliary spoiler is pressed against the side wall of the mixing drum, the side wall of the mixing drum and the locking bolt together squeeze the spring washer and prevent the locking bolt from rotating.

[0020] By adopting the above technical solution, the cylinder wall of the spring-loaded stirring cylinder and the head of the locking bolt are bidirectionally squeezed and deformed, generating radial expansion force and preventing the locking bolt from rotating, thus ultimately increasing the loosening torque of the locking bolt.

[0021] Furthermore, the edge of the spoiler surface is provided with serrated spoiler strips, the height of which is 1 / 5 to 1 / 3 of the height of the spoiler plate.

[0022] By adopting the above technical solution, the sawtooth cutting of aggregate generates stress concentration, which causes the free end to be impacted and induces broadband flutter, exacerbating fluid resonance, thereby improving the crushing efficiency of coarse aggregate and increasing the density of micro vortices.

[0023] Furthermore, the serrated baffle strip is made of spring steel sheet, and the free end of the serrated baffle strip is pre-bent 5°-10° towards the center of the mixing drum.

[0024] By adopting the above technical solution, the 5°-10° pre-bending stores elastic potential energy, which allows the material to release energy and form high-frequency reciprocating vibration when impacted.

[0025] In summary, this application includes at least one of the following beneficial technical effects: The concrete aggregate inside the mixing drum is stirred by the stirring blades through the stirring shaft. The guide surface of the auxiliary baffle is facing the direction of rotation of the stirring blades. When the concrete material is pushed by the blades and comes into contact with the gently raised guide surface, it is naturally guided along the curved surface to the central area of ​​the mixing drum, avoiding ineffective energy dissipation. The high-speed material flow impacts the steep baffle surface, and the high-intensity turbulence is formed by the sharp turning of the curved surface. The aggregate agglomerates are forcibly broken up under the action of shear force. The staggered distribution of multiple rows of baffles covers the entire area of ​​the mixing drum, eliminating dead zones in the axial and circumferential flow fields. Ultimately, this eliminates the mixing dead zone while reducing energy consumption and improving aggregate crushing efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the ready-mixed concrete mixing device of this application; Figure 2 yes Figure 1A cross-sectional schematic diagram of AA in the middle; Figure 3 yes Figure 2 Cross-sectional schematic diagram of BB; Figure 4 yes Figure 3 Enlarged diagram of section C.

[0027] Reference numerals: 1. Stirring drum; 11. Stirring shaft; 12. Stirring blade; 2. Auxiliary baffle; 21. Guide surface; 22. Baffle surface; 23. Settling groove hole; 3. Wear-resistant ceramic liner; 4. Fixing bolt; 5. Locking bolt; 6. Serrated baffle strip; 7. Spring washer. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0029] This application discloses a ready-mixed concrete mixing device.

[0030] Reference Figure 1 and Figure 2 A ready-mixed concrete mixing device includes a mixing drum 1, a mixing shaft 11 horizontally arranged inside the mixing drum 1, and multiple sets of mixing blades 12 installed on the mixing shaft 11. Multiple auxiliary baffles 2 are arranged circumferentially on the inner wall of the mixing drum 1. The length direction of the auxiliary baffles 2 is parallel to the axis of the mixing shaft 11. The cross-section of the auxiliary baffles 2 has an asymmetrical streamlined structure. The side of the auxiliary baffles 2 facing the direction of rotation of the mixing blades 12 is a gently raised guide surface 21, and the side of the auxiliary baffles 2 facing away from the direction of rotation of the mixing blades 12 is a steep baffle surface 22.

[0031] Reference Figure 2 The mixing drum 1 is fixedly mounted on the frame in a horizontal direction, and the mixing shaft 11 is rotatably mounted on the mixing drum 1. The mixing shaft 11 is set horizontally, and multiple sets of mixing blades 12 are fixedly mounted on the mixing shaft 11. When the mixing shaft 11 rotates under the drive of the driving component, it drives the concrete in the mixing drum 1 to rotate, thereby realizing the mixing of the material in the mixing drum 1. The driving component in this embodiment consists of a drive motor and a reducer.

[0032] Reference Figure 2 and Figure 3 The auxiliary baffles 2 are arranged in multiple rows along the axial direction of the mixing drum 1. The auxiliary baffles 2 in adjacent rows are staggered and offset by a certain width in the circumferential direction to avoid blind zones in the flow field. The height of the auxiliary baffles 2 is 1 / 15 to 1 / 10 of the diameter of the mixing drum 1, and the length of the auxiliary baffles 2 is 1 / 4 to 1 / 3 of the length of the mixing drum 1. In this embodiment, the optimal height of the auxiliary baffles 2 is 1 / 15 of the diameter of the mixing drum 1, and the optimal length of the auxiliary baffles 2 is 1 / 3 of the length of the mixing drum 1.

[0033] Reference Figure 4 The radius of curvature R1 of the guide surface 21 is greater than the radius of curvature R2 of the turbulence surface 22, and satisfies R1≥2R2. This allows the guide surface 21 to smoothly guide the concrete to the center of the mixing drum 1 when the mixing blades push the concrete to flow, thereby reducing energy loss. When the high-speed material impacts the turbulence surface 22, it forms high-intensity turbulence through the steep curved surface, thereby completely breaking up the aggregate agglomerates.

[0034] Reference Figure 4 Multiple sets of mounting bases are pre-installed on the inner wall of the mixing drum 1. The multiple sets of mounting bases are welded and installed on the inner wall of the mixing drum 1. The auxiliary baffle 2 is detachably installed on the mounting base by fixing bolts 4, so as to facilitate the repair and replacement of the damaged auxiliary baffle 2.

[0035] Reference Figure 4 The surface of the auxiliary baffle 2 is covered with a replaceable wear-resistant ceramic liner 3. The auxiliary baffle 2 has a settling hole 23 spaced apart on the side of the mixing drum 1. The settling hole 23 is provided with a locking bolt 5 that is connected to the internal thread of the wear-resistant ceramic liner 3. The wear-resistant ceramic liner 3 is fixed and locked to the surface of the auxiliary baffle 2 by multiple sets of locking bolts 5, so that the settling hole 23 is closed when the auxiliary baffle 2 is installed on the side wall of the mixing drum 1, thereby improving the fixing effect of the wear-resistant ceramic liner 3.

[0036] Reference Figure 4 To further reduce the probability of the locking bolt 5 loosening, after the locking bolt 5 locks the wear-resistant ceramic liner 3, a spring washer 7 is installed in the countersink hole 23. The spring washer 7 is clamped on the side of the locking bolt 5 near the bottom of the auxiliary baffle 2. When the auxiliary baffle 2 is pressed against the side wall of the mixing drum 1, the side wall of the mixing drum 1 and the locking bolt 5 exert a joint squeezing action to prevent the locking bolt 5 from rotating, thereby improving the locking effect between the wear-resistant ceramic liner 3 and the auxiliary baffle 2.

[0037] Reference Figure 2 and Figure 4 The edge of the turbulence surface 22 is provided with a serrated turbulence strip 6. The height of the serrated turbulence strip 6 is 1 / 5 to 1 / 3 of the height of the turbulence plate. The serrated turbulence strip 6 is made of spring steel sheet. The free end of the serrated turbulence strip 6 is pre-bent 5° to 10° towards the center of the mixing drum 1. In this embodiment, the optimal height of the serrated turbulence strip 6 is 1 / 5 of the height of the auxiliary turbulence plate 2. The spring steel sheet is pre-bent 8°. The serrated turbulence strip 6 is fixedly installed on the auxiliary turbulence plate 2 by bolts. The wear-resistant ceramic liner 3 and the auxiliary turbulence plate 2 are provided with grooves for snapping and positioning the serrated turbulence strip 6. The surface of the serrated turbulence strip 6 is flush with the surface of the wear-resistant ceramic liner 3.

[0038] Reference Figure 2 and Figure 4 When high-speed material impacts the steep curved surface of the turbulence surface 22, it forms high-intensity turbulence, which in turn causes the sawtooth turbulence strip 6 to be impacted and generate high-frequency flutter, ultimately cutting the coarse aggregate and inducing the generation of micro vortices.

[0039] The working principle of this application embodiment is as follows: The mixing shaft 11 mixes the concrete aggregate in the mixing drum 1 through the mixing blades. The guide surface 21 of the auxiliary baffle 2 faces the rotation direction of the mixing blades 12. When the concrete material is pushed by the blades and comes into contact with the gently raised guide surface 21, it is naturally guided along the curved surface to the central area of ​​the mixing drum 1, avoiding ineffective energy dissipation. The high-speed material flow impacts the steep baffle surface 22, and the high-intensity turbulence is formed by the sharp turning of the curved surface. The aggregate agglomerates are forcibly broken under the action of shear force. The staggered distribution of multiple rows of baffles covers the entire area of ​​the mixing drum 1, eliminating dead angles in the axial and circumferential flow fields. Finally, the mixing dead zone is eliminated while reducing energy consumption and improving the aggregate crushing efficiency.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A ready-mixed concrete mixing device, comprising a mixing drum (1), a mixing shaft (11) horizontally disposed within the mixing drum (1), and multiple sets of mixing blades (12) mounted on the mixing shaft (11), characterized in that: Multiple auxiliary baffles (2) are arranged circumferentially on the inner wall of the stirring drum (1). The length direction of the auxiliary baffles (2) is parallel to the axis of the stirring shaft (11). The cross-section of the auxiliary baffles (2) is an asymmetrical streamlined structure. The side of the auxiliary baffles (2) facing the direction of rotation of the stirring blade (12) is a gently raised guide surface (21), and the side of the auxiliary baffles (2) facing away from the direction of rotation of the stirring blade (12) is a steep baffle surface (22).

2. The ready-mixed concrete mixing device according to claim 1, characterized in that: The auxiliary baffles (2) are arranged in multiple rows along the axial direction of the mixing drum (1), with adjacent rows of auxiliary baffles (2) being staggered.

3. The ready-mixed concrete mixing device according to claim 1, characterized in that: The radius of curvature R1 of the guiding surface (21) is greater than the radius of curvature R2 of the turbulence surface (22), and satisfies R1≥2R2.

4. The ready-mixed concrete mixing device according to claim 3, characterized in that: The height of the auxiliary baffle (2) is 1 / 15 to 1 / 10 of the diameter of the mixing drum (1), and the length of the auxiliary baffle (2) is 1 / 4 to 1 / 3 of the length of the mixing drum (1).

5. The ready-mixed concrete mixing device according to claim 1, characterized in that: The auxiliary baffle (2) is detachably mounted on a pre-set mounting base inside the mixing drum (1) by fixing bolts (4).

6. The ready-mixed concrete mixing device according to claim 5, characterized in that: The surface of the auxiliary baffle (2) is covered with a replaceable wear-resistant ceramic liner (3). The auxiliary baffle (2) has a settling hole (23) on the side of the side wall near the mixing drum (1). The settling hole (23) is provided with a locking bolt (5) that is threadedly connected to the inside of the wear-resistant ceramic liner (3).

7. The ready-mixed concrete mixing device according to claim 6, characterized in that: The locking bolt (5) is fitted with a spring pad (7) near the bottom side of the auxiliary baffle (2). When the auxiliary baffle (2) is pressed against the side wall of the mixing drum (1), the side wall of the mixing drum (1) and the locking bolt (5) jointly squeeze the spring pad (7) and prevent the locking bolt (5) from rotating.

8. The ready-mixed concrete mixing device according to claim 1, characterized in that: The edge of the spoiler surface (22) is provided with a serrated spoiler strip (6), and the height of the serrated spoiler strip (6) is 1 / 5 to 1 / 3 of the height of the spoiler.

9. The ready-mixed concrete mixing device according to claim 8, characterized in that: The serrated baffle (6) is made of spring steel sheet, and the free end of the serrated baffle (6) is pre-bent 5°-10° toward the center of the stirring cylinder (1).

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