Spiral guide structure for grinding and vertical mill

Abstract

The invention discloses a spiral guide structure for grinding and a vertical mill, and belongs to the technical field of vertical mills.The spiral guide structure comprises a shell, an ash hopper and at least one guide blade, the ash hopper and the guide blade are arranged in the shell, the guide blade is spirally attached to the inner wall of the shell, and the guide blade is located on the peripheral side of the ash hopper; a spiral guide channel which is closed in the circumferential direction is formed among the shell, the guide blade and the ash hopper, and is used for enabling material particles in the shell to move upwards along a preset track of the spiral guide channel. The spiral guide channel is formed between the shell and the ash bucket through the guide blades, so that material particles can flow to the powder concentrator along a preset track of the spiral guide channel, the backflow and vortex phenomena of a flow field in the shell are avoided, the flow field in the shell is improved, the vortex zone area and vortex strength are reduced, and the powder concentrator is more compact in structure. The movement time and the movement path length of the material particles are shortened, the flow speed of airflow is increased, the internal circulation ratio is reduced, and the separation efficiency and the separation effect of the material particles are improved.

Description

Technical Field

[0001] This invention relates to the field of vertical mill technology, and more specifically to a spiral guide structure for grinding and a vertical mill. Background Technology

[0002] Vertical roller mills are large-scale powder processing equipment that integrates multiple functions such as material crushing, conveying, drying, and powder selection. They have advantages such as small footprint, low noise, long service life, and easy operation, and are widely used in mining, building materials, metallurgy, and chemical industries. Vertical roller mills apply grinding pressure through grinding elements to break up material particles on the grinding disc. Due to the rotation of the grinding disc, the crushed particles move to the retaining ring at the edge of the grinding disc under the action of centrifugal force. The material particles are then blown up by high-temperature gas ejected from the air ring, dried by hot air, and conveyed to the separator. Qualified material particles are discharged from the vertical roller mill through the separator, while unqualified large material particles fall back into the grinding area for regrinding.

[0003] During this process, the rotation of the grinding disc and grinding parts alters the airflow direction, causing collisions and friction between the gas and the grinding cavity wall and its internal structure. These phenomena result in pressure loss within the grinding cavity, preventing some material particles from being effectively separated, leading to over-grinding and unnecessary energy loss. Simultaneously, during material particle transport, the net external force on the particles in the upper shell region exceeds the centripetal force, causing the particles to adhere tightly to the inner wall of the upper shell in a circular motion without separation, thus affecting the separation efficiency. This invention proposes a new solution to address these problems. Summary of the Invention

[0004] To overcome at least one of the aforementioned drawbacks, this invention provides a spiral guiding structure for grinding and a vertical mill. The objective of this invention can be achieved by employing the following technical solution: In a first aspect, the present invention provides a spiral guiding structure for grinding, applied to a vertical mill. The vertical mill includes a housing and grinding elements and a classifier disposed within the housing. The spiral guiding structure for grinding includes the housing and a hopper and guide vanes disposed within the housing. The number of guide vanes is at least one and they are spirally arranged against the inner wall of the housing. The guide vanes are located on the outer periphery of the hopper. A circumferentially closed spiral guiding channel is formed between the housing, the guide vanes, and the hopper for causing material particles within the housing to move upward along a predetermined trajectory of the spiral guiding channel.

[0005] In one possible implementation, the cross-section of the spiral guide channel includes an arc shape, with the arc surface located on the side away from the ash hopper, so that the material particles in the spiral guide channel come into contact with the arc surface to achieve deflection.

[0006] In one possible implementation, the classifier is located at the top of the ash hopper, the grinding element is located in the lower chamber of the housing, the top of the guide vane is not lower than the classifier, the bottom of the guide vane is higher than the grinding element, and the spiral guide channel is used to transport the material particles in the lower chamber of the housing along a preset trajectory to the classifier.

[0007] In one possible implementation, one end of the guide vane is connected to the top of the inner wall of the housing, and the other end of the guide vane extends spirally downward along the inner wall of the housing to above the grinding workpiece.

[0008] In one possible implementation, when the number of guide vanes is at least two, the longitudinal spacing between adjacent guide vanes may be the same or different.

[0009] In one possible embodiment, the housing includes a funnel-shaped chamber composed of an upper chamber and a lower chamber, wherein the diameter of the top of the upper chamber is greater than the diameter of the bottom of the upper chamber, and the diameter of the top of the lower chamber is not less than the diameter of the bottom of the lower chamber.

[0010] In one possible implementation, the ash hopper, the guide vane, and the housing are welded together.

[0011] A second aspect of the present invention provides a vertical mill, including any of the grinding spiral guide structures described in the first aspect.

[0012] In one possible implementation, a classifier is included inside the housing. The classifier is located in the upper chamber of the housing and is connected to the discharge port of the housing. The classifier screens the material particles that enter the housing through the spiral guide channel. Material particles that meet the preset size range are discharged through the discharge port, while material particles that do not meet the preset size range are transported to the grinding part position through the ash hopper.

[0013] In one possible implementation, the device includes a grinding element and a grinding disc disposed inside the housing. The grinding disc is disposed at the bottom end of the lower cavity of the housing. The grinding element is connected to a driving device, which drives the grinding element to move and interfere with the material on the grinding disc.

[0014] In one possible implementation, an air ring is provided inside the housing. The air ring is located at the bottom of the lower chamber of the housing and on the outer periphery of the grinding disc, and is used to generate airflow to carry material particles through the spiral guide channel to the classifier.

[0015] The beneficial technical effects of the present invention are as follows: According to the present disclosure, the spiral guiding structure for grinding and the vertical mill form a spiral guiding channel between the shell and the ash hopper by setting spiral guide blades on the inner wall of the shell. This allows material particles to flow along the preset trajectory of the spiral guiding channel to the classifier, avoiding backflow and eddy current phenomena in the internal flow field of the shell, improving the internal flow field of the shell, reducing the vortex area and vortex intensity, shortening the movement time and movement path length of material particles, increasing the airflow velocity, reducing the internal circulation ratio, and improving the separation efficiency and separation effect of material particles. Attached Figure Description

[0016] The following are given by way of example and without limitation in the accompanying drawings: Figure 1 This diagram shows the overall structure of the present invention from one angle; Figure 2 This shows an overall structural schematic diagram of the invention from another angle; Figure 3 This shows a conventional fluid trace diagram inside a vertical mill. Figure 4 A diagram showing the internal fluid traces of the vertical mill of the present invention is shown; Figure 5 A schematic diagram of a vertical mill structure with different numbers of guide vanes is shown; Figure 6 A schematic diagram of a vertical mill structure with guide vanes of different heights is shown; Figure 7 A schematic diagram of a vertical mill structure with different numbers of guide vanes is shown; Figure 8 A cross-sectional schematic diagram of a spiral guide channel is shown. Figure 9 A Rosin-Rammler distribution fitting particle size distribution curve of one embodiment is shown.

[0017] In the diagram: 1. Shell; 2. Grinding parts; 3. Air classifier; 4. Ash hopper; 5. Grinding disc; 6. Air ring; 7. Guide vanes; 8. Discharge port; 9. Spiral guide channel; 10. Arc surface. Detailed Implementation

[0018] In the following detailed disclosure, these embodiments are fully described with reference to the accompanying drawings. In order to enable those skilled in the art to more clearly understand and comprehend the technical solutions of the present invention, the embodiments described below are not limited thereto. The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0019] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] The first aspect of the invention, as Figures 1-8 As shown, a spiral guiding structure for grinding is provided and applied to a vertical mill. The vertical mill includes a housing 1 and grinding elements 2 and a classifier 3 disposed within the housing 1. The spiral guiding structure for grinding includes the housing 1 and a hopper 4 and guide blades 7 disposed within the housing 1. The number of guide blades 7 is at least one and they are spirally arranged against the inner wall of the housing 1. The guide blades 7 are located on the outer periphery of the hopper 4. A spiral guiding channel 9 is formed between the housing 1, the guide blades 7 and the hopper 4, which is closed in the circumferential direction to allow the material particles in the housing 1 to move upward along a preset trajectory of the spiral guiding channel 9.

[0022] like Figure 1 and Figure 2 As shown, the grinding spiral guide structure provided in this embodiment forms a spiral guide channel 9 between the shell 1 and the ash hopper 4 by setting spiral guide blades 7 on the inner wall of the shell 1. This allows material particles to flow to the classifier 3 along the preset trajectory of the spiral guide channel 9. The spiral guide blades 7 can guide the material to flow between the shell 1 and the ash hopper 4 according to the preset trajectory, ensuring that the material can flow smoothly to the classifier 3. This helps to avoid material accumulation and blockage, and improves the working efficiency and stability of the vertical mill.

[0023] Among them, through finite element analysis and post-processing, the result at the z=0 plane is as follows: Figure 3The fluid traces shown clearly indicate that the airflow before the addition of the spiral guide vane 7 is ejected upwards from the air ring 6. A portion of the airflow forms vortices between the ash hopper 4 and the grinding disc 5. The presence of these vortices increases turbulent kinetic energy and turbulent dissipation rate, reduces airflow velocity, and increases energy loss. The internal flow field of the vertical mill is relatively complex, with a large number of vortices, increasing unnecessary material circulation. The longitudinal vortices in the conical section of the ash hopper 4 and the inner wall region of the shell 1 increase as the height of the spiral guide vane 7 decreases. Particles cannot separate from the outlet 8 due to the circulating motion caused by the vortices, leading to increased powder return and hindering the reduction of energy consumption in the roller mill system.

[0024] like Figure 4 As shown, the spiral guiding structure provided in this embodiment enables material particles to move upward along a preset trajectory. The vortex area is small, and the vortex intensity is low, which is beneficial for the airflow to carry the material particles, reducing the particle movement time and path, thereby improving particle separation efficiency. This avoids the occurrence of flow field abnormalities inside the shell 1, such as... Figure 3 The backflow and vortex phenomena shown reduce the vortex area and vortex intensity, preventing material particles inside the vertical mill from being affected by the vortex and circulating, thus avoiding separation from the discharge port. This improves the internal flow field of the shell 1, shortens the movement time and path length of the material particles, increases the airflow velocity, reduces the internal circulation ratio, and improves the separation efficiency and effect of the material particles.

[0025] This application provides a table of particle motion characteristics with and without the spiral guide vane 7, as detailed in Table 1 below.

[0026] Table 1 It is understandable that, through Table 1 and Figure 4 It can be seen that adding the spiral guide vane 7 changes the airflow direction and particle motion characteristics. The airflow and particle motion trajectory are greatly affected by the shape of the spiral guide vane 7. Adding the spiral guide vane 7 significantly shortens the particle motion path length and residence time.

[0027] This application provides, as follows: Figure 5 The particle motion characteristics of the vertical mill with three different numbers of guide vanes 7 are shown in Table 2 below.

[0028] Table 2 Understandably, through Table 2 and Figure 5It can be seen that changing the number of rotations of the helical guide vane 7 alters the airflow direction and particle motion characteristics. To a certain extent, the particle's path length increases with the increase of the number of rotations of the guide vane 7, while the particle's residence time decreases. This is because increasing the number of rotations of the guide vane 7 increases the vane length. Although the particle's path lengthens, the airflow trajectory tends to align with the direction of the guide vane 7. Furthermore, the narrowing of the spacing between the guide vanes 7 increases the airflow velocity inside the flow channel, thereby allowing the particles to be expelled from the mill more quickly, thus reducing the particle residence time.

[0029] This application provides, as follows: Figure 6 The particle motion characteristics of the vertical mill with three different height guide vanes 7 are shown in Table 3 below.

[0030] Table 3 Understandably, through Table 3 and Figure 6 It can be seen that changing the height of the helical guide vane 7 alters the airflow direction and particle motion characteristics. Within a certain range, the path length of most particles increases with the increase of the helical guide vane height. However, the maximum path length and the longest residence time of particles change non-linearly with the vane height, which may be due to the backflow phenomenon generated by the airflow. In summary, the optimal vane height can be determined through calculation and experimentation.

[0031] The change in the height of the guide vane 7 has a significant impact on the length of most of the particle's movement path. This is because as the height of the guide vane 7 increases, the original airflow trajectory is altered, causing the airflow to move in the direction of the vane's rotation, thus increasing the movement distance. Therefore, the material particles travel a longer distance inside the vertical mill when the guide vane 7 is higher. Although the height of the guide vane 7 changes the airflow trajectory, both excessively high and low heights will affect the particle's motion characteristics. If the height of the guide vane 7 is too small, the internal cavity of the vertical mill will be large, creating a large backflow area, causing some particles to move irregularly, resulting in a longer movement time and distance. If the height of the guide vane 7 is too large, the airflow will backflow before entering the guide vane 7 because the airflow direction is different from the vane direction, thus affecting the particle's motion characteristics.

[0032] This application provides, as follows: Figure 7 The particle motion characteristics of the vertical mill with three different numbers of guide vanes 7 are shown in Table 4 below.

[0033] Table 4 Understandably, through Table 4 and Figure 7It can be seen that changing the number of spiral guide blades 7 changes the airflow direction and particle motion characteristics. The motion path length of most particles decreases with the increase of the number of guide blades 7, but the range is not large. The residence time decreases with the increase of the number of guide blades 7, and the change is obvious. This is because the spacing between the guide blades 7 becomes narrower, which increases the airflow velocity inside the flow channel, thereby allowing the particles to be discharged from the mill faster and achieving the effect of reducing the residence time of the particles. The most suitable number of blades can be determined through calculation and experiment.

[0034] The classification efficiency for a given particle size is calculated by the formula: This represents the total number of particles of a certain size separated by the classifier 3. This refers to the total number of particles of a certain size released from the side of the baffle ring. In this embodiment, the particles used are pulverized coal, and the particle size distribution is as follows: Figure 9 As shown, the vertical mill with the addition of spiral guide vanes 7 (specifically, the guide vanes 7 have 1.55 turns, a height H=3256mm, and 8 blades) achieves a particle classification efficiency of 98.90%, compared to the previous vertical mill's separation efficiency of 85.81%, representing an improvement of 13.09%. greater than The cumulative residue (%) of particle size on the sieve, where the classification efficiency is calculated as follows: .

[0035] Understandably, CFD fluid calculations clearly show that different spiral guide vane 7 structures have a significant impact on the particle's movement time and path length. Ultimately, the optimal spiral guide vane 7 structure and number corresponding to the highest separation efficiency were obtained, which improved output and reduced the energy consumption of the grinding system.

[0036] In recording and processing data, absolutely precise values ​​are often unattainable due to various factors. The simulation data provided in this application are approximate values ​​or averages, which help us make reasonable estimations and judgments without strictly precise conditions. They provide an approximate estimate of the true value and can reflect the real situation to a certain extent.

[0037] like Figure 1 and Figure 2 As shown, the spiral guide structure for grinding provided in this embodiment forms an integral whole by fixing guide blades 7 between the ash hopper 4 and the shell 1, which can enhance the structural stability of the vertical mill shell 1, help resist vibration and impact during operation, and extend the service life of the equipment; at the same time, the material particles move along the spiral guide channel 9, which can reduce the impact and friction on the shell 1, further extending the service life of the equipment.

[0038] It is understandable that one end of the spiral guide channel 9 is the inlet facing the lower chamber of the shell 1, and the other end of the spiral guide channel 9 is the outlet 8 facing the classifier 3. The spiral guide channel 9 is closed in the circumferential direction and relatively sealed. The relatively sealed spiral guide channel 9 can effectively prevent gas from leaking out of the channel, maintain the stable gas pressure inside the vertical mill, and ensure the normal operation of the mill.

[0039] The ash hopper 4, guide vanes 7, and shell 1 can be tightly connected together by welding to form a relatively closed space. This space is spiral-shaped, and the guide vanes 7 are spirally distributed along the inner wall of the shell 1, thus forming a spiral guide channel 9. The spiral guide channel 9 can guide the material to flow between the shell 1 and the ash hopper 4 according to a preset trajectory, ensuring that the material can flow smoothly to the classifier 3. Through the guidance of the spiral guide channel 9, the material can be subjected to a more uniform and stable classification effect during the flow process, thereby improving the classification accuracy and efficiency of the classifier 3. At the same time, the robust structure formed by welding can enhance the structural stability of the vertical mill, resist vibration and impact during operation, and extend the service life of the equipment.

[0040] It is understandable that, since both the shell 1 and the ash hopper 4 are approximately funnel-shaped with a wider top and a narrower bottom, the width of the guide vane 7 is determined by the radial distance between the shell 1 and the ash hopper 4.

[0041] Among them, such as Figure 1 and Figure 2 As shown, this embodiment provides a structure of guide vane 7, which is plate-shaped. The cross-sectional shape of the spiral guide channel 9 is quadrilateral. Since the corners of the quadrilateral may cause non-uniformity of fluid flow, it may form specific secondary flow field characteristics. Large vorticity may be generated in the quadrilateral cross-section, especially in the corner area.

[0042] Among them, such as Figure 8 As shown, the cross-section of the spiral guide channel 9 includes an arc shape, and the arc surface 10 is located on the side away from the ash hopper 4, so that the material particles in the spiral guide channel 9 come into contact with the arc surface 10 to achieve deflection. At this time, the cross-section of the spiral guide channel 9 includes an arc shape, and the flow characteristics are smoother. The arc surface 10 reduces the flow resistance caused by the corners. The fluid is more likely to form a stable secondary flow at the arc surface 10 in the spiral guide channel 9. Due to the continuity of the arc cross-section, the vortex distribution is more uniform and the pressure loss is smaller.

[0043] Furthermore, the arc surface 10 can be a semi-circular cross-section. The continuous surface of the semi-circular cross-section reduces flow resistance and reduces pressure loss of airflow, which helps the material flow smoothly.

[0044] Furthermore, a cavity can be formed between the arc surface 10 of the guide vane 7 and the housing 1, so that the airflow carrying the material particles is buffered when passing through the spiral guide channel 9, reducing the impact and vibration of the fluid, thereby improving the stability and operating efficiency of the equipment.

[0045] In one possible implementation, such as Figures 1-2 As shown, the classifier 3 is located at the top of the ash hopper 4, the grinding element 2 is located in the lower chamber of the shell 1, the top of the guide vane 7 is not lower than the classifier 3, and the bottom of the guide vane 7 is higher than the grinding element 2. The spiral guide channel 9 is used to transport the material particles in the lower chamber of the shell 1 to the classifier 3 along a preset trajectory.

[0046] In this process, material particles are transported from the lower chamber of the shell 1 to the classifier 3 along the preset trajectory of the spiral guide channel 9 under the action of wind. The classifier 3 is located in the upper chamber of the shell 1. The classifier 3 uses the high-speed rotating airflow and the screening effect of the cage rotor to classify the ground material. Material particles that meet the preset size range are selected as qualified products and sent out of the shell 1 through the discharge port. Material particles that do not meet the preset size range are classified as unqualified products and fall into the grinding disc 5 through the ash hopper 4 at the bottom to be ground again by the grinding parts 2, thereby realizing the recycling of material grinding and efficient classification.

[0047] In one possible implementation, such as Figures 1-2 As shown, one end of the guide vane 7 is connected to the top of the inner wall of the housing 1, and the other end of the guide vane 7 extends spirally downward along the inner wall of the housing 1 to the top of the grinding workpiece 2.

[0048] The connection method of the guide vane 7 can ensure that the material particles flow in the housing 1 according to the preset spiral trajectory with the airflow. When the material particles are located at the grinding part 2, they will be captured by the airflow and pushed upward along the spiral shape of the guide vane 7. This can not only help the material particles enter the classifier 3 smoothly, but also improve the uniformity of the material particles to a certain extent, and avoid problems such as blockage, overflow or leakage.

[0049] The outer edge of the guide vane 7 is connected to the inner wall of the housing 1, and the inner edge of the guide vane 7 is connected to the outer wall of the ash hopper 4. The space between the housing 1 and the ash hopper 4 is divided by the guide vane 7 into at least one spiral guide channel 9.

[0050] In one possible implementation, the longitudinal spacing between adjacent guide vanes 7 may be the same or different, and the number of guide vanes 7 may be one, two, three or other integers.

[0051] The longitudinal spacing of adjacent guide vanes 7 is the same, that is, the cross-sectional height of the spiral guide channel 9 is consistent. In order to ensure uniform airflow, the cross-section of the spiral guide channel 9 is kept consistent along the entire length, that is, a spiral guide channel 9 with equal cross-section is formed, so as to ensure that the material particles and airflow are uniformly guided and propelled when passing through the channel.

[0052] The longitudinal spacing between adjacent guide vanes 7 is different. In order to optimize the flow characteristics of the airflow, the cross section of the spiral guide channel 9 changes at different positions to adapt to different flow requirements.

[0053] Furthermore, the cross-section of the spiral guide channel 9 can gradually increase from top to bottom. The larger inlet makes it easier for airflow to enter and capture material particles. After the airflow enters the spiral guide channel 9, the cross-sectional size gradually decreases, which can increase the airflow velocity so that the airflow can carry the material particles to the classifier 3 more smoothly, further improving the conveying efficiency.

[0054] In one possible implementation, the housing 1 includes a funnel-shaped chamber, which is composed of an upper chamber and a lower chamber. The diameter of the top of the upper chamber is greater than the diameter of the bottom of the upper chamber, and the diameter of the top of the lower chamber is not less than the diameter of the bottom of the lower chamber.

[0055] Understandably, the shell 1 is designed in an approximate funnel shape. The funnel-shaped chamber facilitates the convergence and guidance of materials. The lower chamber has a smaller diameter to concentrate the airflow and make it easier to capture material particles. The funnel-shaped ash hopper 4 causes unqualified material particles after screening to be squeezed and guided during their flow within the ash hopper 4. This helps the material particles enter the grinding disc 5 for re-grinding more quickly, reducing the residence time of materials in the shell 1 and improving the efficiency of the entire grinding process. The upper chamber, which is wider at the top and narrower at the bottom, is set according to the shape of the ash hopper 4 to ensure that the spiral guide channel 9 has a uniform cross-section or increases sequentially from top to bottom, in order to ensure the flow rate of the airflow in the upper chamber of the shell 1.

[0056] It is understood that the helical guide structure for grinding provided in this application can be applied to vertical roller mills, as well as other grinding devices other than roller mills.

[0057] The second aspect of the invention, as Figures 1-7 As shown, a vertical mill is provided, including any of the grinding spiral guide structures in the first aspect.

[0058] In one possible implementation, a classifier 3 is installed inside the housing 1. The classifier 3 is located in the upper chamber of the housing 1 and is connected to the discharge port of the housing 1. The classifier 3 screens the material particles that enter the housing through the spiral guide channel 9. Material particles that meet the preset size range are discharged through the discharge port, while material particles that do not meet the preset size range are transported to the grinding part 2 through the ash hopper 4.

[0059] In this process, material particles enter the classifier 3 through the spiral guide channel 9. The classifier 3 then performs its screening function, precisely classifying the material particles. Particles meeting the preset size range are screened out and discharged through the outlet of the shell 1, entering subsequent processing or collection stages. This ensures that only qualified particles are further processed, guaranteeing product quality and precision. Particles not meeting the preset size range are transported through the ash hopper 4 inside the classifier 3. These particles are collected in the ash hopper 4 and guided to the grinding disc 5 for further grinding of the workpiece 2. This not only improves material utilization but also ensures the continuity and efficiency of the entire production process. In one possible implementation, the device includes a grinding element 2 and a grinding disc 5 disposed inside the housing 1. The grinding disc 5 is disposed at the bottom of the lower cavity of the housing 1. The grinding element 2 is connected to a driving device, which drives the grinding element 2 to move and interfere with the material on the grinding disc 5.

[0060] The grinding disc 5 is fixed at the bottom of the lower chamber to ensure that the material falls onto the grinding disc 5. The grinding element 2 usually interferes with the grinding disc 5 through a drive device (such as a motor, reducer, coupling, etc.). The drive device provides power to the grinding element 2, which can be a roller mill, causing the roller mill to tumble or rotate on the grinding disc 5, thereby grinding the material on the grinding disc 5. When the material falls onto the grinding disc 5, the roller mill starts to move under the drive of the drive device and comes into contact with the material. Due to the gravity of the roller mill and the grinding force applied to the material, the material is sheared, squeezed, and ground into finer particles.

[0061] Understandably, during the grinding process, factors such as the gap between the grinding piece 2 and the grinding disc 5, the grinding force, and the grinding time all affect the grinding effect and fineness of the material. These factors can be specifically designed and adjusted according to the grinding requirements.

[0062] In one possible implementation, an air ring 6 is provided inside the housing 1. The air ring 6 is located at the bottom of the lower chamber of the housing 1 and on the outer periphery of the grinding disc 5. It is used to generate airflow to drive material particles through the spiral guide channel 9 to the classifier 3.

[0063] The air ring 6 is located on the outer periphery of the grinding disc 5 so that it can directly act on the material on the grinding disc 5. The airflow generated by the air ring 6 effectively carries the material particles. The airflow generated by the air ring 6 forms around the grinding disc 5 and can quickly lift the ground material particles from the grinding disc 5. The airflow carries the material particles upward and transports them to the classifier 3 for further screening and processing through a specific path (such as the spiral guide channel 9). Under the action of the airflow generated by the air ring 6, the material particles are effectively dispersed and suspended, which helps to improve grinding efficiency and fineness control. It also ensures that the material particles can smoothly enter the classifier 3 through the spiral guide channel 9, thereby completing the entire grinding and screening process.

[0064] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0066] In view of the detailed description above, these and other changes can be made to these embodiments, and this written description includes embodiments of the best mode that disclose the invention. The patent scope of the invention is defined by the claims, which are not limited by this disclosure. The scope of protection of the invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the invention disclosed herein, based on the technical solutions and concepts of the invention, are within the scope of protection of the invention.

Claims

1. A spiral guide structure for grinding, characterized by, The application is applied to a vertical mill, which comprises a shell (1), a grinding part (2) and a powder classifier (3) arranged in the shell (1), the grinding spiral guide structure comprises a shell (1), a hopper (4) and a guide vane (7) arranged in the shell (1), the number of the guide vane (7) is at least one and the guide vane (7) is arranged in a spiral shape on the inner wall of the shell (1), the guide vane (7) is located on the outer circumferential side of the hopper (4), the shell (1), the guide vane (7) and the hopper (4) form a spiral guide channel (9) which is closed in the circumferential direction, and the spiral guide channel (9) is used for moving the material particles in the shell (1) upward along the preset track of the spiral guide channel (9).

2. The abrasive helical guide structure according to claim 1, wherein The cross section of the spiral guide channel (9) comprises an arc, and an arc surface (10) is located on the side away from the hopper (4) to make the material particles in the spiral guide channel (9) contact the arc surface (10) to realize turning.

3. The abrasive helical guide structure according to claim 1, wherein The powder classifier (3) is located on the top of the hopper (4), the grinding part (2) is located in the lower chamber of the shell (1), the top end of the guide vane (7) is not lower than the powder classifier (3), the bottom end of the guide vane (7) is higher than the grinding part (2), and the spiral guide channel (9) is used for conveying the material particles in the lower chamber of the shell (1) to the powder classifier (3) along the preset track.

4. The abrasive helical guide structure according to claim 3, wherein One end of the guide vane (7) is connected with the top of the inner wall of the shell (1), and the other end of the guide vane (7) extends downward in a spiral shape on the inner wall of the shell (1) to above the grinding part (2).

5. The abrasive helical guide structure according to claim 1, wherein When the number of the guide vanes (7) is at least two, the longitudinal spacing of adjacent guide vanes (7) is the same or different.

6. The abrasive helical guide structure according to claim 1, wherein The shell (1) comprises a funnel-shaped chamber, the funnel-shaped chamber is composed of an upper chamber and a lower chamber, the diameter of the top of the upper chamber is greater than the diameter of the bottom of the upper chamber, and the diameter of the top of the lower chamber is not less than the diameter of the bottom of the lower chamber.

7. A vertical mill, characterized by The application further discloses a vertical mill comprising the grinding spiral guide structure.

8. The vertical mill of claim 1, wherein, The powder classifier (3) is arranged in the upper chamber of the shell (1) and communicates with the discharge port (8) of the shell (1), the powder classifier (3) screens the material particles entering the interior of the powder classifier (3) through the spiral guide channel (9), the material particles meeting the preset size range are discharged through the discharge port (8), and the material particles not meeting the preset size range are conveyed to the grinding part (2) through the hopper (4).

9. The vertical mill according to claim 8, characterized in that, The application further discloses a vertical mill comprising the grinding spiral guide structure.

10. The vertical mill according to claim 9, characterized in that, The air ring (6) is arranged inside the shell (1), at the bottom end of the lower chamber of the shell (1) and at the outer peripheral side of the grinding disc (5), for generating airflow to carry material particles to the powder classifier (3) through the spiral guide channel (9).

Images