A mixing ball mill device for concrete admixtures

Abstract

The utility model relates to the technical field of powder grinding equipment, and specifically discloses a mixed ball mill device for concrete admixture. The device comprises a horizontally arranged cylinder and a driving mechanism for driving the cylinder to rotate around its axis, and a plurality of axial flow guide partition plates are arranged in the cylinder. Each flow guide partition plate is independently arranged inside the cylinder, and the adjacent flow guide partition plates have opposite spiral flow guide vanes. The driving mechanism is arranged at one end of the cylinder and is drivingly connected with the cylinder. The design of the adjacent partition plates with staggered spiral flow guide vanes enables the device to forcibly mix and cross the light and heavy admixtures at the axial and radial interface. The flow direction of the admixture alternately reverses in each chamber, forming strong radial shear and vortex, which fundamentally breaks and inhibits the radial stratification phenomenon caused by density difference. The device solves the problem of stratification of concrete admixture in the cylinder in the conventional mixed ball mill device for concrete admixture.

Description

Technical Field

[0001] This utility model belongs to the technical field of grinding equipment, specifically, it relates to a ball milling device for mixing concrete admixtures. Background Technology

[0002] Ball mills, as the mainstream equipment in industrial grinding and mixing, are widely used in the preparation of various powder materials due to their large throughput and continuous operation capabilities, and are also an important link in the production line of composite concrete admixtures. However, during the high-speed rotation of the ball mill cylinder, the admixtures inside are subjected to a complex combination of centrifugal force, gravity, and interparticle friction. When processing composite admixtures, if there are significant density differences between the components, radial stratification of the admixtures can easily occur. For example, in the mixing process of concrete admixtures, slag with higher density tends to accumulate in the inner wall area of ​​the cylinder under the action of centrifugal force; while fly ash with relatively lower density is more likely to accumulate near the central axis of the cylinder. This radial stratification caused by the difference in internal and external density brings multiple technical challenges and economic losses. On the one hand, the increased fluctuation in the composition of the output product leads to poor stability between different batches of products, seriously affecting the accuracy of subsequent concrete mix design and the controllability of the final product's performance. On the other hand, the admixtures in some areas of the cylinder may be over-ground or under-ground due to uneven distribution. This not only increases unnecessary energy consumption and reduces grinding efficiency, but may also cause the activity index of the admixtures to become discrete, further weakening their synergistic effect in concrete and ultimately affecting the overall quality control of high-performance concrete.

[0003] Therefore, how to actively intervene and force cross-mix the radial distribution of admixtures of different densities within the limited cylindrical space of a ball mill, through structural design, in order to completely break and eliminate the stratification phenomenon of admixtures caused by density differences, has become a key challenge and an urgent technical problem to be solved in the field of high-performance concrete admixture preparation.

[0004] Based on this, the present invention proposes a ball milling device for mixing concrete admixtures to solve the problems existing in the prior art. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a ball milling device for mixing concrete admixtures, which is simple in structure and reasonable in design, and can solve the problem of easy stratification of concrete admixtures in the cylinder of traditional ball milling devices for mixing concrete admixtures.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A ball mill apparatus for mixing concrete admixtures includes a horizontally arranged cylinder and a drive mechanism for driving the cylinder to rotate about its axis. The cylinder is provided with multiple levels of flow guide baffles along the axial direction. Each level of flow guide baffle is independently provided inside the cylinder, and the spiral guide blades of adjacent flow guide baffles rotate in opposite directions. The drive mechanism is located at one end of the cylinder and is connected to the cylinder drive.

[0007] In a preferred embodiment, the flow guide baffle plate includes: The outer ring, which is circular in shape, is connected to the inner wall of the cylinder. The inner ring, in the shape of a circular ring, is located in the central axis region of the cylinder. Several connecting ribs are provided between the outer ring and the inner ring, and are connected to the outer ring and the inner ring respectively.

[0008] In a preferred embodiment, the spiral guide vane includes a first spiral guide vane, which is circumferentially and equidistantly disposed on the inner wall of the outer ring, and the first spiral guide vanes on adjacent outer rings have opposite directions of rotation.

[0009] In a preferred embodiment, the spiral guide vane further includes a second spiral guide vane, which is circumferentially and equidistantly disposed on the inner wall of the inner ring, and the blades of the second spiral guide vanes on adjacent inner rings have opposite directions of rotation.

[0010] In a preferred embodiment, the inner ring has multiple rows of through holes along the circumferential and axial directions on its ring wall.

[0011] In a preferred embodiment, the connecting rib has a plate-like structure, is arranged radially, and its two ends are respectively connected to the outer wall of the inner ring and the inner wall of the outer ring.

[0012] In a preferred embodiment, an external drive gear is provided at the end of the cylinder, and the external drive gear is meshed with a drive mechanism.

[0013] In a preferred embodiment, the inner wall of the cylinder is provided with a plurality of fitting grooves, which are matched with the outer ring.

[0014] In a preferred embodiment, the inner wall of the cylinder is further provided with spiral guide lines, which spiral along the feed port toward the discharge port.

[0015] In a preferred embodiment, the cylinder is further equipped with a plurality of spherical grinding media.

[0016] Compared with the prior art, the present invention provides a ball milling device for mixing concrete admixtures, which has the following beneficial effects: 1. Through the staggered spiral guide vanes of adjacent compartment plates, this device forces light and heavy admixtures to repeatedly cross-mix at the axial and radial interfaces. The flow direction of the admixtures alternately reverses in each compartment, forming strong radial shear and vortex, fundamentally breaking down and suppressing radial stratification caused by density differences.

[0017] 2. The mixing mechanism of this device relies entirely on the internal geometry of the ball mill cylinder and the flow pattern of the admixture generated by its rotation, eliminating the need for complex external power sources, auxiliary agitators, or sophisticated independent control systems. This purely structured solution significantly reduces equipment complexity and potential failure points, thereby improving operational reliability. Furthermore, the absence of additional power components or control loops substantially reduces initial investment and long-term operation and maintenance costs.

[0018] 3. This device can efficiently achieve uniform mixing of admixtures, avoiding the situation where traditional ball mills are forced to extend grinding time or increase grinding media in pursuit of admixture uniformity. By optimizing the flow pattern of admixtures, ineffective admixture circulation and local over-grinding are reduced, thereby lowering the energy consumption of the entire ball milling process.

[0019] 4. The principle of this device is based on the density differences of admixtures and their hydrodynamic behavior within the rotating cylinder, thus it has broad applicability to the types of admixtures processed. It solves the problem of stratification of concrete admixtures within the cylinder, a common issue in traditional concrete admixture mixing ball mills.

[0020] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the ball mill device for mixing concrete admixtures according to this utility model. Figure 2 This is a cross-sectional view of the cylindrical body of this utility model; Figure 3 This is a cross-sectional view of the flow guide baffle plate of this utility model; Figure 4 This is a cross-sectional view of the inner ring of this utility model; Figure 5 This utility model Figure 4 A magnified view of a portion of point A in the middle.

[0022] [Explanation of Key Component Symbols] 1. Cylinder; 11. Fitting groove; 12. Guide pattern; 2. Drive mechanism; 3. Grinding media; 4. Outer ring; 41. First spiral guide vane; 5. Connecting rib; 6. Inner ring; 61. Through hole; 62. Second spiral guide vane; 7. Feed port; 8. Discharge port; 9. External drive gear. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings and embodiments thereof.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0028] like Figures 1 to 5 As shown, this utility model provides a technical solution: A ball milling device for mixing concrete admixtures aims to achieve forced, repeated, and staggered mixing of powdered admixtures of different densities in both the axial and radial directions by optimizing the internal geometry. This effectively suppresses and eliminates radial stratification caused by density differences in the admixtures, ensuring a high degree of uniformity in the mixed admixtures. Its specific structure includes a horizontally mounted cylinder 1 and a drive mechanism 2 used in conjunction with the cylinder 1. The cylinder 1 is a standard cylindrical structure, rotatably mounted on a horizontal support. An external drive gear 9 is provided at one end of the cylinder 1 near the drive mechanism 2, meshing with the drive mechanism 2, thereby driving the cylinder 1 to rotate. Several stages of flow-guiding baffles are also installed inside the cylinder 1. Each stage of the flow-guiding baffle is set in the cylinder 1 as an independent unit, and each flow-guiding baffle includes an outer ring 4 and an inner ring 6. The outer ring 4 is fixedly installed on the inner side wall of the cylinder 1, and the inner ring 6 is located in the central axis area of ​​the cylinder 1 and is connected to the outer ring 4 by several connecting ribs 5. They work together to form an internal channel for forced cross-flow of the admixture.

[0029] In one specific implementation, such as Figure 1 and Figure 2 As shown, to facilitate the installation of the outer ring 4, a plurality of fitting grooves 11 are provided on the inner side wall of the cylinder 1. The fitting grooves 11 are used in conjunction with the outer ring 4 for the installation of the outer ring 4 during use.

[0030] Specifically, such as Figure 1 and Figure 2As shown, in order to guide the admixture, a spiral guide pattern 12 is also provided on the inner wall of the cylinder 1. The guide pattern 12 spirals along the feed port 7 to the discharge port 8. The guide pattern allows the admixture in the cylinder 1 to move from the feed port 7 to the discharge port 8 when the cylinder 1 rotates, thus applying a direction of movement to the admixture.

[0031] Specifically, such as Figure 1 and Figure 2 As shown, in order to achieve the ball milling effect on the admixture, several spherical grinding media 3 are also installed inside the cylinder 1, so that the grinding media 3 can play a mixing role on the admixture during the rotation of the cylinder 1.

[0032] Specifically, the main body of the cylinder 1 is preferably made of high-strength wear-resistant steel, such as carbon structural steel of grade Q345B or 16Mn low alloy high-strength structural steel, and is manufactured by precision rolling and full penetration welding process to ensure the structural integrity and fatigue life of the cylinder under long-term high-load rotation and material impact.

[0033] In one specific implementation, such as Figure 1 As shown, the drive mechanism 2 is the power source that ensures the stable rotation of the cylinder 1. Its components include, but are not limited to, a high-power, high-efficiency three-phase AC asynchronous motor, such as a Y-series or YX-series motor with a rated power in the range of 500kW to 2000kW; and a matching gear reducer, the reduction ratio of which is precisely calculated according to the required working speed of the cylinder and the rated speed of the motor, so as to achieve high torque output and low-speed smooth operation.

[0034] In one specific implementation, such as Figure 1 and Figure 3 As shown, the outer ring 4 has a circular structure and serves as the external skeleton of the flow guide baffle plate. It is fixedly fitted into the fitting groove 11. On the inner side wall of the outer ring 4, the first spiral flow guide blade 41 is integrally formed or welded at equal intervals along its circumference as a key element for realizing axial conveying and radial disturbance of materials.

[0035] Specifically, the pitch of the first helical guide vane 41 (i.e., the distance the helix travels when rotating 360 degrees axially) is preferably 0.3 to 0.6 times the effective diameter of the cylinder 1. This pitch range is based on engineering optimization that balances the axial conveying efficiency and radial mixing intensity of the material. The helix angle of the first helical guide vane 41 (i.e., the angle between the helix and the cross-sectional plane of the cylinder 1) is preferably 15° to 30°, so that the first helical guide vane 41 can lift the material to a suitable height, causing it to fall or cascade under gravity. This generates strong shearing and impact between the first helical guide vane 41 and the material layer, as well as within the material layer, greatly promoting radial mixing of the material while maintaining reasonable axial conveying efficiency. The second helical guide vane 62 follows the same principle.

[0036] In one specific implementation, such as Figure 1 , Figure 4 and Figure 5 As shown, the inner ring 6 also has a circular structure and is arranged in the central axis area of ​​the cylinder to form an internal material channel. Multiple rows of through holes 61 are densely opened on the ring wall of the inner ring 6 along the circumferential and axial directions. Furthermore, a second spiral guide vane 62 is integrally formed or welded on the inner wall of the inner ring 6 at equal intervals along its circumference to guide the flow of the mixed material.

[0037] Specifically, the diameter of the through hole 61 is preferably 5 to 10 mm, designed to allow lighter admixture particles, such as fine-grained fly ash, to pass through the inner ring efficiently and smoothly, thereby ensuring sufficient exchange of materials inside and outside the inner ring. At the same time, this size provides some barrier to any small number of larger particles or grinding media used for grinding (such as steel balls, ceramic balls, etc.; although this invention primarily focuses on mixing, it may be compatible with some grinding scenarios), preventing them from passing through the central channel too quickly, thus ensuring the residence time of the material in the main mixing zone.

[0038] Specifically, the opening ratio of the inner ring 6 (i.e., the percentage of the total area of ​​the through holes 61 to the total surface area of ​​the inner ring wall) is preferably set to not less than 40%. This ensures that a sufficient amount of lightweight material can effectively enter the central region from the outer ring 4 region through the inner ring 6 and return from the central region to the outer ring 4.

[0039] In one specific implementation, such as Figure 1 and Figure 3As shown, the connecting rib 5 has a plate-like structure and serves as a supporting element connecting the inner ring 6 and the outer ring 4, together forming the overall flow guide baffle plate. Firstly, the connecting rib 5 provides structural support, ensuring the geometric stability of the baffle plate under high-speed rotation. Secondly, they form local obstacles in the flow path of the admixture, forcibly diverting the admixture and generating local eddies in the process. These eddies further promote radial mixing of the admixture. Finally, the specific arrangement of the connecting ribs can also guide the axial flow of the material to a certain extent, preventing local material accumulation.

[0040] In one specific implementation, such as Figure 1 and Figure 3 As shown, the first helical guide blades 41 and the second helical guide blades 62 of adjacent two-stage guide baffles rotate in opposite directions to form an axially staggered arrangement. Specifically, if the helical guide blades of the first-stage baffle are designed to rotate right-handed, then the first helical guide blades 41 and the second helical guide blades 62 of the following second-stage baffle are designed to rotate left-handed; further on, the first helical guide blades 41 and the second helical guide blades 62 of the third-stage baffle return to rotating right-handed, and so on, until the discharge end of the cylinder. This axially staggered helical arrangement is a key structural element for achieving forced radial mixing of materials of different densities, and its working principle is fundamentally different from the single-direction helical guidance or non-guided structure in traditional ball mills.

[0041] The usage process and principle of the ball mill device for mixing concrete admixtures described in this utility model include: When a mixture containing components of different densities (e.g., a denser heavy admixture and a less dense light admixture) is continuously fed into the feed port 7 of the ball mill cylinder 1, the cylinder 1 begins to rotate at high speed around its axis under the action of the drive mechanism 2. Within the chamber formed by the first-stage guide baffle plate inside the cylinder 1 (hereinafter referred to as the first-stage chamber), the material particles are subjected to the combined effects of centrifugal force, gravity, and interparticle friction generated by the rotation of the cylinder 1. At this time, the denser heavy admixture (e.g., slag particles, with an apparent density of approximately 2.9 g / cm³)... 3 Under strong centrifugal force, the material tends to be concentrated in the area of ​​the inner wall of cylinder 1 and rotates together with the inner wall. This concentrated heavy material in the cylinder wall area is then captured and guided by the first helical guide vanes 41 (e.g., right-handed vanes) on the outer ring 4. Due to the inclination angle of the first helical guide vanes 41, the heavy material is lifted and simultaneously receives axial thrust in a specific axial direction (e.g., towards the discharge port 8), thus forming a spiral-forward flow of heavy material in the outer peripheral region. Simultaneously, the relatively low-density lightweight admixture (e.g., fly ash particles, apparent density approximately 2.2 g / cm³) is also affected. 3Due to its smaller mass, the material is less likely to be thrown towards the wall of cylinder 1 under the same centrifugal force, and is more likely to remain in the area near the central axis of cylinder 1. The lighter material in these central areas can enter the central flow channel within the inner ring 6 through the through-holes 61 on the inner ring 6 wall, and, driven by the overall material flow, spiral forward along the axial direction of the inner ring 6 (the same axial direction as the heavier material on the outer periphery). During this stage, although the material moves axially, due to density differences, there may still be a relatively obvious density stratification trend in the radial direction, i.e., the heavier material tends to be concentrated on the outer side, and the lighter material tends to be concentrated on the inner side.

[0042] The core forced cross-mixing mechanism occurs at the interface region where material flows out of one compartment and into the next adjacent compartment with the opposite rotation direction (e.g., from a right-handed first-stage compartment to a left-handed second-stage compartment). When the heavy admixture flows out of the cylinder wall region (outer flow channel) of the first-stage right-handed compartment, it immediately encounters and is guided by the second-stage left-handed first helical guide vane 41. Since the rotation direction of the second-stage first helical guide vane 41 is completely opposite to that of the first-stage first helical guide vane 41, the heavy material flow, originally pushed along the cylinder wall of cylinder 1 and advancing in a certain axial direction (e.g., positive axis) by the first-stage first helical guide vane 41, is now pushed by the second-stage left-handed first helical guide vane 41 in an axial direction opposite to the original direction (e.g., negative axis). This forced reversal of the axial flow direction not only generates severe shear stress at the interface between adjacent compartment plates, but more importantly, the inclined surface of the first helical guide vane 41 exerts a forced disturbance on the radial position of the heavy material. The heavy material no longer moves simply along the wall of the cylinder 1, but is forced by the geometry of the first spiral guide vane 41 to move from the wall of the cylinder 1 toward the central region.

[0043] Meanwhile, the lightweight admixture (inner flow channel) flowing out from the through-hole 61 of the inner ring 6 of the first-stage chamber, upon entering the second-stage left-handed chamber, is also subjected to the axial reverse thrust of the second-stage left-handed helical guide vanes 62. The lightweight material, which originally moved in a specific axial direction in the central region, is now forced to change its axial flow direction, and its radial position also changes significantly under the combined disturbance of the second helical guide vanes 62 and the connecting ribs 5. Some of the lightweight material is forcibly pushed from the central region towards the cylinder wall of the cylinder 1.

[0044] This repeated reversal of axial flow direction creates a unique, high-intensity radial mixing zone at the interface between each adjacent baffle plate. Within this zone, heavy materials that originally flowed along the wall of cylinder 1 are forced towards the center, while light materials that originally flowed along the center are forced to disperse towards the wall of cylinder 1. This reverse radial movement leads to large-scale particle and momentum exchange between materials of different densities, creating powerful eddies and turbulence effects. Heavy and light components no longer simply move parallel along their respective radial regions, but are forced to undergo large-scale particle exchange and mixing at the radial level. Heavy materials are forced from the cylinder wall region towards the center region, while light materials are forced from the center region towards the cylinder wall region. As the material flows through the multi-stage, interlaced baffle plates, this radial mixing mechanism acts repeatedly, with each intersection equivalent to a thorough overturning and stirring of the material. This continuous and forced reversal of axial flow direction and reconstruction of radial position fundamentally overcomes the difficulty in eliminating radial stratification caused by centrifugal force in ball mills with a single cyclone or no flow guide structure, ensuring the high uniformity of the final output product.

[0045] The above description is merely an embodiment of this application and does not constitute any limitation on this application. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of this application shall still fall within the protection scope of the technical solution of this application.

Claims

1. A ball mill apparatus for mixing concrete admixtures, comprising a horizontally arranged cylinder (1) and a drive mechanism (2) for driving the cylinder (1) to rotate about its axis, characterized in that, The cylinder (1) is provided with multiple levels of flow guide baffles along the axial direction. Each level of the flow guide baffle is independently provided inside the cylinder (1), and the spiral guide blades of adjacent flow guide baffles rotate in opposite directions. The driving mechanism (2) is located at one end of the cylinder (1) and is drivingly connected to the cylinder (1).

2. The ball mill apparatus for mixing concrete admixtures as described in claim 1, characterized in that, The flow guide baffle plate includes: The outer ring (4) is circular and connected to the inner wall of the cylinder (1); The inner ring (6) is circular and located in the central axis region of the cylinder (1). Several connecting ribs (5) are provided between the outer ring (4) and the inner ring (6) and are respectively connected to the outer ring (4) and the inner ring (6).

3. The ball mill apparatus for mixing concrete admixtures as described in claim 2, characterized in that, The spiral guide vane includes a first spiral guide vane (41), which is equidistantly arranged on the inner wall of the outer ring (4) in the circumferential direction, and the first spiral guide vanes (41) on adjacent outer rings (4) have opposite directions of rotation.

4. The ball mill apparatus for mixing concrete admixtures as described in claim 3, characterized in that, The spiral guide vane also includes a second spiral guide vane (62), which is equidistantly arranged on the inner wall of the inner ring (6) along the circumference, and the blades of the second spiral guide vanes (62) on adjacent inner rings (6) have opposite directions of rotation.

5. The ball mill apparatus for mixing concrete admixtures as described in claim 2, characterized in that, The inner ring (6) has multiple rows of through holes (61) along the circumferential and axial directions on its ring wall.

6. The ball mill apparatus for mixing concrete admixtures as described in claim 2, characterized in that, The connecting rib (5) has a plate-like structure and is arranged radially. The two ends of the connecting rib (5) are connected to the outer wall of the inner ring (6) and the inner wall of the outer ring (4), respectively.

7. The ball mill apparatus for mixing concrete admixtures as described in claim 1, characterized in that, An external drive gear (9) is provided at the end of the cylinder (1), and the external drive gear (9) is meshed with the drive mechanism (2).

8. The ball mill apparatus for mixing concrete admixtures as described in claim 1, characterized in that, The inner wall of the cylinder (1) is provided with several fitting grooves (11), which are matched with the outer ring (4).

9. The ball mill apparatus for mixing concrete admixtures as described in claim 1, characterized in that, The inner wall of the cylinder (1) is also provided with a spiral guide pattern (12), which spirals along the feed port (7) toward the discharge port (8).

10. The ball mill apparatus for mixing concrete admixtures as described in claim 1, characterized in that, The cylinder (1) is also equipped with several spherical grinding media (3).

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