Vertical mill air inlet and discharge device and working method

Abstract

The present application belongs to the technical field of powder processing equipment, and particularly relates to a vertical mill air inlet and discharge device and a working method thereof; wherein one kind of vertical mill air inlet and discharge device comprises: an air inlet channel arranged on the outer wall of a grinding cylinder; a support frame rotatably arranged in the air inlet channel; at least two cleaning members hingedly connected to the outer wall of the support frame and abutting against the bottom wall of the air inlet channel; and a guide strip fixed to the inner bottom wall of the air inlet channel and having a horizontal height greater than that of the bottom of the cleaning member; wherein, during grinding, the grinding disc device rotates forward, the support frame synchronously rotates to abut against the guide strip with the bottom wall of the cleaning member, the cleaning member is inwardly turned and folded and moves upward, and compressed air is spirally delivered into the grinding cylinder through the air ring; during cleaning of the air inlet channel, the grinding disc device reversely rotates, the cleaning member is extruded outward by the material supported in the air inlet channel to turn and open outward to scrape off the material on the bottom wall of the air inlet channel, and the cleaning member moves upward when abutting against the guide strip to clean the residual material on the side wall of the cleaning member.

Description

Technical Field

[0001] This invention belongs to the technical field of powder processing equipment, and particularly relates to a vertical mill air inlet and unloading device and its working method. Background Technology

[0002] Vertical roller mills, as high-efficiency grinding equipment, are widely used in the ultrafine grinding of materials such as cement, slag, and coal powder. Their core working principle is as follows: after the material is fed into the grinding disc, it rotates synchronously with the disc and moves towards the edge of the disc under centrifugal force. Simultaneously, the grinding rollers, driven by the rocker arm device, apply pressure to the disc. Through relative rotation, the material is squeezed and ground, ultimately forming qualified powder. To achieve efficient output of qualified material, an air inlet duct is installed on the side of the frame near the grinding cylinder, and air channels connected to the air inlet duct are arranged around the circumference of the grinding disc. Compressed air enters the grinding cylinder through the air inlet duct and flows spirally along the axial direction of the air channels, thus blowing the qualified powder from bottom to top to the next process. However, during the grinding process, some large particles may fall into the air inlet duct through the air channels, easily causing problems such as pipe blockage, equipment wear, and reduced grinding efficiency.

[0003] In existing technology, a support platform is typically installed around the circumference of the protective cylinder surrounding the bottom wall of the grinding disc in the air inlet duct. The horizontal height of the support platform is lower than the inner bottom wall of the air inlet duct, used to support falling materials. Simultaneously, several scrapers are evenly distributed around the outer circumference of the protective cylinder. The rotation of the grinding disc drives the scrapers to gather the material on the platform, which is then collected through the platform's discharge port. However, this structure has significant drawbacks: Airflow interference problem: The scraper extends and is fixed radially along the outer wall of the grinding disc, which will significantly increase the flow resistance of compressed air in the air inlet pipe to the air duct, destroy the uniformity of airflow, and make it difficult for compressed air to form a stable spiral airflow through the air duct, thus affecting the efficiency of powder sorting and conveying.

[0004] Functional contradiction: If the volume or area of ​​the scraper is reduced to reduce airflow interference, the scraper will not be able to effectively remove the material on the platform, and the accumulated material will not be effectively cleaned, which may easily lead to material accumulation, equipment jamming and other malfunctions.

[0005] In summary, the existing scraper structure of vertical roller mills cannot simultaneously meet the dual requirements of "low airflow interference" and "efficient material cleaning," thus limiting the operational stability and energy efficiency of the vertical roller mill. Therefore, how to solve the above-mentioned defects is a technical problem that urgently needs to be addressed in this field.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute information related to the technology. Summary of the Invention

[0007] This disclosure provides at least one vertical mill air intake and unloading device and its working method.

[0008] In a first aspect, embodiments of this disclosure provide a vertical mill air inlet and outlet device, comprising: An air inlet duct is provided on the outer wall of the grinding cylinder and is connected to the grinding cylinder through an air ring, which is arranged circumferentially along the grinding disc device; The support frame is fixed to the outer wall of the grinding disc of the grinding disc device and is rotatably installed in the air inlet duct; At least two cleaning components are hinged to the outer wall of the support frame in a height-adjustable manner, and their bottom walls abut against the bottom wall of the air inlet duct; The guide strip is fixed to the bottom wall of the air inlet duct, and its horizontal height is greater than the horizontal height of the bottom of the cleaning component; During grinding, the grinding disc rotates in the forward direction, and the support frame rotates synchronously until the bottom wall of the cleaning part abuts against the guide strip. The cleaning part flips inward and moves upward, and compressed air is spirally transported to the grinding cylinder through the air ring. When cleaning the air inlet duct, the grinding disc rotates in the opposite direction. The cleaning component is squeezed outward and flipped open by the material supported in the air inlet duct to scrape off and guide the material on the bottom wall of the air inlet duct. When the cleaning component comes into contact with the guide strip, it moves upward and the guide strip cleans the material remaining on the side wall of the cleaning component.

[0009] In one optional embodiment, the guide bar has a horizontal projection that is triangular and extends radially along the grinding disc. The two side walls of the guide bar are respectively provided with inclined surfaces to push the cleaning component upward.

[0010] In one optional implementation, the cleaning component includes: The positioning plate is set vertically, and a pivot is set on the side near the support frame; The scraping plate is fixed to the side wall of the positioning plate and its lower end extends radially along the grinding disc; The fixing sleeve is vertically installed on the side wall of the support frame and has an axial through hole that matches the rotating shaft.

[0011] In one optional embodiment, the upper end of the fixing sleeve is provided with a stepped surface, and the side wall of the step is provided with an inclined surface; When the scraper is pushed by the guide bar to flip and retract towards the support frame, the inner wall of the positioning plate is guided by the inclined surface to abut against the step surface, so that the scraper moves upward.

[0012] In one optional embodiment, a limiting strip is provided on the outer wall of the fixing sleeve, and the limiting strip extends radially along the grinding disc; The scraper has a limiting groove on its side wall that matches the limiting strip. When the limiting strip abuts against the limiting groove, the scraper is perpendicular to the side wall of the support frame.

[0013] In one optional embodiment, a protective cylinder is provided on the inner ring of the support frame. The protective cylinder extends along the axial direction of the grinding disc and penetrates the bottom wall of the air inlet duct. The protective cylinder is used to prevent material from falling downward through the gap between the support frame and the air inlet duct.

[0014] In one optional embodiment, a protrusion is provided at one end of the scraper near the support frame, and the protrusion abuts against the protective cylinder; When the scraper blade flips inward and moves upward, the protrusion moves upward simultaneously to continue scraping the material off the outer wall of the protective cylinder.

[0015] In one optional embodiment, a material collection bin is provided on the side of the bottom wall of the air inlet duct near the guide strip, and the bottom wall of the material collection bin is provided with an openable and closable sealing door.

[0016] In one alternative embodiment, a support frame rotatably disposed within the air inlet duct is ring-shaped and rotates synchronously with the turntable. A cleaning component that is vertically hinged to the side wall of a support frame, the cleaning component comprising: The positioning plate is set vertically, and a pivot is set on the side near the support frame; The scraping plate is fixed to the side wall of the positioning plate, with its lower end extending radially along the grinding disc and fitting against the inner bottom wall of the air inlet duct. A fixed sleeve is vertically installed on the side wall of the support frame and has an axial through hole that matches the rotating shaft. The bottom wall of the air inlet duct is provided with a guide strip with a horizontal projection of a triangle, and its horizontal height is greater than the horizontal height of the bottom of the cleaning component; When the support frame rotates in the forward direction, the scraper plate abuts against the guide strip, the scraper plate flips inward and moves upward, and the compressed air is spirally conveyed upward through the air inlet duct. When cleaning the air inlet duct, the support frame rotates in the opposite direction, and the scraper is squeezed outward by the material in the air inlet duct, opening and scraping away and guiding the material on the bottom wall of the air inlet duct; when the scraper comes into contact with the guide strip, it moves upward, and the guide strip cleans the material remaining on the side wall of the scraper.

[0017] In one optional embodiment, the upper end of the fixing sleeve is provided with a stepped surface, and the side wall of the step is provided with an inclined surface; The outer wall of the fixed sleeve is also provided with a limiting strip, which extends radially along the grinding disc; The scraper has a limiting groove on its side wall that matches the limiting strip. When the limiting strip abuts against the limiting groove, the scraper is perpendicular to the side wall of the support frame.

[0018] Secondly, this disclosure also provides a method for operating a vertical mill air inlet and outlet device, the method comprising: During grinding, the grinding disc rotates in the forward direction, and the support frame rotates synchronously until the bottom wall of the cleaning part abuts against the guide strip. The cleaning part flips inward and moves upward, and compressed air is spirally transported into the grinding cylinder through the air ring. When cleaning the air inlet duct, the grinding disc rotates in the opposite direction. The cleaning component is squeezed outward and flipped open by the material supported in the air inlet duct to scrape off and guide the material on the bottom wall of the air inlet duct. When the cleaning component comes into contact with the guide strip, it moves upward and the guide strip cleans the material remaining on the side wall of the cleaning component.

[0019] The beneficial effects of this invention are as follows: This invention provides a vertical mill air inlet and discharge device and its working method. By switching between the forward and reverse rotation of the grinding disc, the cleaning component is driven to achieve the action changes of "retracting and rising" and "opening and scraping". During the grinding operation, the cleaning component is flipped inward and moved upward by the abutment of the guide strip, which greatly reduces the space occupied by the cleaning component in the air inlet and the windward area, reduces the flow resistance of compressed air in the air inlet, and ensures that the compressed air forms a stable spiral airflow through the air ring, effectively improving the sorting and conveying efficiency of qualified powders and solving the problem of airflow interference of existing fixed scrapers. During the air inlet cleaning, the grinding disc rotates in the reverse direction, and the cleaning component is squeezed outward and flipped open by the material. The bottom wall is always in contact with the bottom wall of the air inlet, which can efficiently scrape off and guide large particles of material accumulated on the bottom wall of the air inlet, avoiding material blockage of pipes and wear of equipment, solving the defect of insufficient material cleaning capacity of existing scrapers, and truly achieving the dual satisfaction of two core needs.

[0020] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A perspective view of the vertical mill air inlet and unloading device provided in an embodiment of this disclosure; Figure 2 A partial sectional perspective view of the vertical mill air inlet and unloading device provided in an embodiment of this disclosure; Figure 3 A perspective view of the cleaning component and support frame provided in the embodiments of this disclosure; Figure 4 A schematic diagram of the open state of the cleaning component provided in an embodiment of this disclosure; Figure 5 This is a front view of the cleaning component in its flipped and folded state, provided in an embodiment of this disclosure. Figure 6 A perspective view of the air inlet duct and grinding disc device provided in an embodiment of this disclosure.

[0024] In the picture: 1. Air inlet duct; 10. Air ring; 11. Material collection bin; 2. Grinding cylinder; 3. Grinding disc device; 4. Support frame; 40. Protective sleeve; 5. Cleaning component; 51. Positioning plate; 52. Rotating shaft; 53. Scraper; 54. Fixing sleeve; 55. Stepped surface; 56. Limiting strip; 57. Limiting groove; 58. Protrusion; 6. Guide strip. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0027] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify an entire column of elements when following a column of elements. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0028] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise expressly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0029] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0030] Research has revealed that in related technologies, a support platform is typically installed circumferentially around the protective cylinder surrounding the bottom wall of the grinding disc within the air inlet duct. This platform is horizontally lower than the inner bottom wall of the air inlet duct and is used to support falling materials. Simultaneously, several scrapers are evenly distributed circumferentially on the outer wall of the protective cylinder. The rotation of the grinding disc causes the scrapers to gather the material on the platform, which is then collected through the platform's discharge port. However, this structure has significant drawbacks: Airflow interference problem: The scraper extends and is fixed radially along the outer wall of the grinding disc, which will significantly increase the flow resistance of compressed air in the air inlet pipe to the air duct, destroy the uniformity of airflow, and make it difficult for compressed air to form a stable spiral airflow through the air duct, thus affecting the efficiency of powder sorting and conveying.

[0031] Functional contradiction: If the volume or area of ​​the scraper is reduced to reduce airflow interference, the scraper will not be able to effectively remove the material on the platform, and the accumulated material will not be effectively cleaned, which may easily lead to material accumulation, equipment jamming and other malfunctions.

[0032] In summary, the existing scraper structure of vertical mills cannot simultaneously meet the dual requirements of "low airflow interference" and "efficient material cleaning," thus limiting the operational stability and energy efficiency of the vertical mill. Therefore, how to solve the above-mentioned defects is a technical problem that urgently needs to be addressed in this field.

[0033] The defects in the above solutions and the reasons for their occurrence are the results of the inventors' practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventors' contributions to this disclosure.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] like Figures 1 to 6 As shown, at least one embodiment provides a vertical mill air inlet and outlet device, including: an air inlet duct 1, which is disposed on the outer wall of the grinding cylinder 2 and communicates with the grinding cylinder 2 through an air ring 10, the air ring 10 being arranged circumferentially along the grinding disc device 3; the air inlet duct 1 has an annular structure and is connected to a high-pressure blower through a connecting pipe, the inner side of the air inlet duct 1 being connected to the interior of the grinding cylinder 2 through the air rings 10 uniformly arranged circumferentially along the grinding disc device 3, the air rings 10 being the channel for compressed air to enter the grinding cylinder 2, ensuring that the compressed air forms a spiral airflow along the circumference of the grinding disc. Figure 6 A guide strip 6 is provided on the inner bottom wall of the air inlet duct 1 near the air inlet, and the guide strip 6 extends radially along the grinding cylinder 2. The inner bottom wall of the air inlet duct 1 is recessed downward on the side near the guide strip 6 to form a collection bin 11. The collection bin 11 has an inverted conical structure, and its bottom wall is hinged with an openable and closable sealing door. The sealing door is engaged with the collection bin 11 by a buckle and is used to collect the material scraped off by the cleaning component 5. Opening the sealing door can realize the centralized unloading of the material. The inner bottom wall of the air inlet duct 1 is a smooth wear-resistant metal surface to reduce the frictional resistance between the material and the bottom wall and avoid material adhesion and accumulation.

[0037] like Figure 2 The support frame 4 is fixed to the outer wall of the grinding disc of the grinding disc device 3 and rotatably mounted within the air inlet duct 1. The support frame 4 is an annular steel structure adapted to the air inlet duct 1. Its inner side is welded and fixed to the outer wall of the grinding disc of the grinding disc device 3, and the entire structure rotatably mounted within the annular groove of the air inlet duct 1. It can rotate synchronously with the grinding disc device 3 in both forward and reverse directions, maintaining the same coaxiality to ensure operational stability. A protective cylinder 40 is welded to the inner ring of the support frame 4, extending downwards along the grinding disc axis. Its lower end penetrates the bottom wall of the air inlet duct 1 and seals against it. The lower end is fixed to the fixed frame of the grinding cylinder 2 and does not rotate with the grinding disc. This protective cylinder 40 prevents material from falling through the annular gap between the support frame 4 and the air inlet duct 1 into the internal transmission component area of ​​the vertical mill, thus avoiding component wear.

[0038] like Figure 2 and Figure 3 At least two cleaning components 5 are hinged to the outer wall of the support frame 4 in a height-adjustable manner, and their bottom walls abut against the bottom wall of the air inlet duct 1. Six cleaning components 5 are evenly arranged along the circumference of the support frame 4 (meeting the design requirement of at least two), all of which are hinged to the outer wall of the support frame 4 in a height-adjustable and flip-up manner. The bottom wall of the cleaning component 5 always abuts against the inner bottom wall of the air inlet duct 1. Each cleaning component 5 consists of a positioning plate 51, a rotating shaft 52, a scraping plate 53, and a fixing sleeve 54. It also includes a stepped surface 55, a limiting strip 56, a limiting groove 57, a protrusion 58, and other supporting structures. The specific cooperation relationship of each structure is as follows: like Figure 3 The positioning plate 51 is a vertically arranged rectangular wear-resistant steel plate. A cylindrical rotating shaft 52 is welded and fixed to the middle of the side of the plate near the support frame 4. The axis of the rotating shaft 52 is arranged along the axial direction of the grinding disc. The scraping plate 53 is an L-shaped wear-resistant steel plate. Its vertical end is welded or bolted to one side wall of the positioning plate 51, and its horizontal end extends outward along the radial direction of the grinding disc. The bottom wall of the horizontal end of the scraping plate 53 is close to the inner bottom wall of the air inlet duct 1. An arc-shaped protrusion 58 is welded to the end of the scraping plate 53 near the support frame 4. The inner side wall of the protrusion 58 is in close contact with the outer wall of the protective cylinder 40, and can scrape off the material adhering to the outer wall of the protective cylinder 40 with the movement of the scraping plate 53. Figure 3 In the diagram, F1 indicates the direction in which the cleaning component 5 is pushed and rotated by the guide bar 6 (e.g., ...). Figure 3 (Counterclockwise direction).

[0039] like Figure 4 The fixing sleeve 54 is a cylindrical sleeve, vertically welded and fixed to the outer wall of the support frame 4, corresponding one-to-one with the rotating shaft 52. The fixing sleeve 54 has a through hole adapted to the rotating shaft 52 in the axial direction. The rotating shaft 52 rotates and can be lifted and lowered through the through hole to realize the hinged engagement between the cleaning part 5 and the support frame 4. The upper end of the fixing sleeve 54 is turned inward to form an annular stepped surface 55. The side wall of the stepped surface 55 near the scraping plate 53 is machined with an inclined surface with an angle of 45° to guide the positioning plate 51 to move upward. The outer wall of the fixing sleeve 54 is welded with a cuboid limiting strip 56 along the radial direction of the grinding disc. The vertical end side wall of the scraping plate 53 has a rectangular limiting groove 57 adapted to the limiting strip 56. When the limiting strip 56 abuts against the bottom of the limiting groove 57, the scraping plate 53 is perpendicular to the outer wall of the support frame 4, realizing the angle limit after the cleaning part 5 is flipped open, avoiding damage to the parts due to excessive flipping angle caused by material compression.

[0040] like Figure 2 and Figure 6The guide strip 6 is fixed to the inner bottom wall of the air inlet duct 1, and its horizontal height is greater than the horizontal height of the bottom of the cleaning component 5. The guide strip 6 is a wear-resistant steel structure with an isosceles triangle in horizontal projection. It is welded and fixed to the inner bottom wall of the air inlet duct 1 along the radial direction of the grinding disc, and its horizontal height is higher than the horizontal height of the bottom of the cleaning component 5. Both sides of the guide strip 6 are machined with inclined surfaces at an angle of 30°. These inclined surfaces are adapted to the bottom wall of the scraper plate 53 of the cleaning component 5, and are used to push the cleaning component 5 upward when it rotates to abut against the guide strip 6. The triangular tip of the guide strip 6 is arranged radially outward along the grinding disc to reduce the contact resistance with the material and the cleaning component 5. During grinding, the grinding disc device 3 rotates in the forward direction, and the support frame 4 rotates synchronously until the bottom wall of the cleaning part 5 abuts against the guide strip 6. The cleaning part 5 flips inward and moves upward, and compressed air is spirally conveyed to the grinding cylinder 2 through the air ring 10. When cleaning the air inlet 1, the grinding disc device 3 rotates in the reverse direction, and the cleaning part 5 is squeezed outward and opened by the material supported in the air inlet 1 to scrape off and guide the material on the bottom wall of the air inlet 1. When the cleaning part 5 abuts against the guide strip 6, it moves upward, and the guide strip 6 cleans the material remaining on the side wall of the cleaning part 5.

[0041] The working principle of a vertical mill air inlet and discharge device is as follows: When the vertical mill is grinding materials, the grinding disc device 3 is controlled to rotate clockwise at a set speed. The support frame 4, which is fixed to the outer wall of the grinding disc, rotates clockwise in the air inlet duct 1 in sync with the grinding disc device 3, causing the circumferentially arranged cleaning components 5 to rotate synchronously along the bottom wall of the air inlet duct 1. When the bottom wall of the scraper plate 53 of the cleaning component 5 rotates to abut against the inclined surface of the guide bar 6, the rotating shaft 52 of the cleaning component 5 slides upward along the through hole of the fixing sleeve 54 under the pushing action of the guide bar 6. At the same time, the scraper plate 53 is squeezed by the guide bar 6 and flips inward toward the support frame 4. During this process, the inner side wall of the positioning plate 51 contacts the inclined surface of the upper step surface 55 of the fixing sleeve 54 and continues to move upward under the guidance of the inclined surface until the positioning plate 51 and the step surface 55 are completely abutted. The cleaning component 5 completes the retraction and rising action. At this time, the scraper plate 53 is close to the outer wall of the support frame 4, greatly reducing the windward area.

[0042] In this state, compressed air delivered by the external fan enters through the air inlet duct 1 and is spirally transported into the grinding cylinder 2 without significant resistance along the circumferential air ring 10. A stable upward airflow is formed in the grinding cylinder 2, which blows the qualified powder ground by the grinding disc device 3 from bottom to top to the subsequent powder selection and collection process, thereby achieving efficient powder output.

[0043] Cleaning operation: When the vertical mill completes one grinding cycle, or when material accumulation is detected in the air inlet duct 1, the compressed air supply is stopped, and the grinding disc device 3 is controlled to rotate in the opposite direction (counterclockwise) at a set speed. The support frame 4 rotates in the opposite direction synchronously with the grinding disc device 3, driving the cleaning component 5 to rotate in the opposite direction along the inner bottom wall of the air inlet duct 1. During the reverse rotation, the scraper plate 53 is subjected to the squeezing force of the large particles of material supported in the air inlet duct 1, overcoming the resistance force of the guide strip 6 and flipping outward away from the support frame 4 until the limiting strip 56 abuts against the bottom of the limiting groove 57. The scraper plate 53 remains perpendicular to the outer wall of the support frame 4, and its bottom wall is always in close contact with the inner bottom wall of the air inlet duct 1. The protrusion 58 is always in contact with the outer wall of the protective cylinder 40. As the cleaning component 5 continues to rotate in the opposite direction with the support frame 4, the horizontal end of the scraper 53 slides along the inner bottom wall of the air inlet duct 1, scraping away and guiding the material accumulated on the inner bottom wall of the air inlet duct 1 toward the collection bin 11, and finally the material falls into the collection bin 11 for centralized collection; at the same time, the protrusion 58 moves synchronously with the scraper 53, scraping away the material adhering to the outer wall of the protective cylinder 40, and preventing the material from accumulating on the surface of the protective cylinder 40.

[0044] When the cleaning component 5 rotates in the reverse direction and comes into contact with the guide bar 6 again, it moves upward under the pushing action of the guide bar 6. During this process, the inclined surface of the guide bar 6 is in close contact with the side wall of the scraper 53 of the cleaning component 5, directly scraping off the residual adhering material on the side wall of the cleaning component 5, thus achieving dual cleaning of the bottom wall of the air inlet duct 1 and the cleaning component 5 itself, ensuring thorough cleaning.

[0045] In light of the industry application requirements of vertical mills in grinding different materials such as cement, slag, and coal powder, the following adaptive adjustments can be made to this embodiment without departing from the core design concept of the present invention: Wear resistance performance adaptation: For grinding hard materials such as slag, a ceramic wear-resistant coating can be sprayed on the bottom wall of scraper plate 53, the inclined surface of guide strip 6, and the inner bottom wall of air inlet duct 1 to improve the wear resistance service life of components and reduce equipment maintenance costs; Cleaning component 5 quantity adaptation: For large-diameter grinding discs of large-size vertical mills, the number of cleaning components 5 can be increased proportionally to the circumference of the grinding disc to ensure that there are no dead corners in the cleaning of the inner bottom wall of the air inlet duct 1. Speed ​​adaptation: For grinding materials such as coal powder that are prone to dust, the speed of the grinding disc device 3 during reverse cleaning can be reduced to prevent the material from being lifted up and adhering to the inner wall of the air inlet duct 1 again, thereby improving the cleaning effect. The vertical mill air intake and discharge device in this embodiment has a stable structure, reliable operation, and simple and easy operation method. It can be fully adapted to the existing vertical mill grinding process, effectively solves the core pain points of the existing technology, and greatly improves the operating stability, energy saving and production efficiency of the vertical mill. It has broad industrial application value.

[0046] At least one embodiment provides a vertical mill air inlet and outlet device, comprising: The support frame 4, which is rotatably installed in the air inlet duct 1, is ring-shaped and rotates synchronously with the turntable; A cleaning component 5 that is hinged to the side wall of the support frame 4 in a height-adjustable manner, the cleaning component 5 comprising: The positioning plate 51 is vertically arranged, and a rotating shaft 52 is provided on the side near the support frame 4; The scraping plate 53 is fixed to the side wall of the positioning plate 51, and its lower end extends radially along the grinding disc and fits the inner bottom wall of the air inlet duct 1. The fixing sleeve 54 is vertically installed on the side wall of the support frame 4 and has an axial through hole that is adapted to the rotating shaft 52; The bottom wall of the air inlet duct 1 is provided with a guide strip 6 whose horizontal projection is triangular, and its horizontal height is greater than the horizontal height of the bottom of the cleaning component 5; When the support frame 4 rotates in the forward direction, the scraper 53 abuts against the guide bar 6, the scraper 53 flips inward and moves upward, and the compressed air is spirally conveyed upward through the air inlet duct 1. When cleaning the air inlet duct 1, the support frame 4 rotates in the opposite direction, and the scraper 53 is squeezed outward by the material in the air inlet duct 1 and flips open, scraping and guiding the material on the bottom wall of the air inlet duct 1; when the scraper 53 comes into contact with the guide bar 6, it moves upward, and the guide bar 6 cleans the material remaining on the side wall of the scraper 53.

[0047] At least one embodiment provides a method for operating a vertical mill air inlet and outlet device, the method comprising: During grinding, the grinding disc device 3 rotates in the forward direction, and the support frame 4 rotates synchronously until the bottom wall of the cleaning part 5 abuts against the guide strip 6. The cleaning part 5 flips inward and moves upward, and compressed air is spirally transported to the grinding cylinder 2 through the air ring 10. When cleaning the air inlet duct 1, the grinding disc device 3 rotates in the opposite direction. The cleaning part 5 is squeezed outward and opened by the material supported in the air inlet duct 1 to scrape off and guide the material on the bottom wall of the air inlet duct 1. When the cleaning part 5 comes into contact with the guide bar 6, it moves upward and the guide bar 6 cleans the material remaining on the side wall of the cleaning part 5.

[0048] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0049] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0050] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A vertical mill air inlet and discharge device, characterized in that, include: An air inlet duct (1) is provided on the outer wall of the grinding cylinder (2) and is connected to the grinding cylinder (2) through an air ring (10). The air ring (10) is arranged around the grinding disc device (3). The support frame (4) is fixed to the outer wall of the grinding disc of the grinding disc device (3) and is rotatably installed in the air inlet duct (1); At least two cleaning components (5) are hinged to the outer wall of the support frame (4) in a lifting manner, and their bottom walls abut against the bottom wall of the air inlet duct (1); The guide strip (6) is fixed to the bottom wall of the air inlet duct (1), and its horizontal height is greater than the horizontal height of the bottom of the cleaning part (5); During grinding, the grinding disc device (3) rotates in the forward direction, and the support frame (4) rotates synchronously until the bottom wall of the cleaning part (5) abuts against the guide strip (6). The cleaning part (5) flips inward and moves upward, and compressed air is spirally transported to the grinding cylinder (2) through the air ring (10). When cleaning the air inlet duct (1), the grinding disc device (3) rotates in the opposite direction. The cleaning part (5) is squeezed outward by the material supported in the air inlet duct (1) to scrape off and guide the material on the bottom wall of the air inlet duct (1). When the cleaning part (5) comes into contact with the guide strip (6), it moves upward and the guide strip (6) cleans the material remaining on the side wall of the cleaning part (5).

2. The vertical mill air inlet and unloading device as described in claim 1, characterized in that, The guide bar (6) has a triangular horizontal projection and extends radially along the grinding disc. The two side walls of the guide bar (6) are respectively provided with inclined surfaces to push the cleaning part (5) to move upward.

3. The vertical mill air inlet and unloading device as described in claim 2, characterized in that, The cleaning component (5) includes: The positioning plate (51) is set vertically and has a rotating shaft (52) on the side near the support frame (4). The scraping plate (53) is fixed to the side wall of the positioning plate (51) and its lower end extends radially along the grinding disc; The fixing sleeve (54) is vertically set on the side wall of the support frame (4) and has an axial through hole that is adapted to the rotating shaft (52).

4. The vertical mill air inlet and discharge device as described in claim 3, characterized in that, The upper end of the fixing sleeve (54) is provided with a stepped surface (55), and the side wall of the step is provided with an inclined surface; When the scraper (53) is pushed by the guide bar (6) to flip and retract towards the support frame (4), the inner wall of the positioning plate (51) is guided by the inclined surface to abut against the step surface (55) so that the scraper (53) moves upward.

5. The vertical mill air inlet and unloading device as described in claim 3, characterized in that, A limiting strip (56) is provided on the outer wall of the fixed sleeve (54), and the limiting strip (56) extends radially along the grinding disc; The scraper (53) has a limiting groove (57) on its side wall that is adapted to the limiting strip (56). When the limiting strip (56) and the limiting groove (57) abut against each other, the scraper (53) is perpendicular to the side wall of the support frame (4).

6. The vertical mill air inlet and discharge device as described in claim 3, characterized in that, The inner ring of the support frame (4) is provided with a protective cylinder (40), which extends along the grinding disc axis and penetrates the bottom wall of the air inlet pipe; the protective cylinder (40) is used to prevent materials from falling down through the gap between the support frame (4) and the air inlet pipe (1).

7. The vertical mill air inlet and discharge device as described in claim 6, characterized in that, The scraper (53) has a protrusion (58) at one end near the support frame (4), and the protrusion (58) abuts against the protective cylinder (40); When the scraper (53) flips inward and moves upward, the protrusion (58) moves upward simultaneously to continue scraping the material on the outer wall of the protective cylinder (40).

8. The vertical mill air inlet and unloading device as described in claim 2, characterized in that, A material collection bin (11) is provided on the bottom wall of the air inlet duct (1) near the guide strip (6), and a sealing door that can be opened and closed is provided on the bottom wall of the material collection bin (11).

9. A vertical mill air inlet and discharge device, characterized in that, include: The support frame (4) installed in the air inlet duct (1) is rotatable, and it is ring-shaped and rotates synchronously with the turntable; A cleaning component (5) that is hinged to the side wall of the support frame (4) in a height-adjustable manner, the cleaning component (5) comprising: The positioning plate (51) is set vertically and has a rotating shaft (52) on the side near the support frame (4). The scraping plate (53) is fixed to the side wall of the positioning plate (51), and its lower end extends radially along the grinding disc and fits the inner bottom wall of the air inlet duct (1). The fixed sleeve (54) is vertically installed on the side wall of the support frame (4) and has an axial through hole that is compatible with the rotating shaft (52); The bottom wall of the air inlet duct (1) is provided with a guide strip (6) with a horizontal projection of a triangle, and its horizontal height is greater than the horizontal height of the bottom of the cleaning component (5); When the support frame (4) rotates in the forward direction, the scraper (53) abuts against the guide strip (6), the scraper (53) flips inward and moves upward, and the compressed air is spirally conveyed upward through the air inlet duct (1); When cleaning the air inlet duct (1), the support frame (4) rotates in the opposite direction, and the scraper plate (53) is squeezed outward by the material in the air inlet duct (1) and flips open, scraping and guiding the material on the bottom wall of the air inlet duct (1); when the scraper plate (53) comes into contact with the guide strip (6), it moves upward, and the guide strip (6) cleans the material remaining on the side wall of the scraper plate (53).

10. The vertical mill air inlet and discharge device as described in claim 9, characterized in that, The upper end of the fixing sleeve (54) is provided with a stepped surface (55), and the side wall of the step is provided with an inclined surface; The outer wall of the fixed sleeve (54) is also provided with a limiting strip (56), which extends radially along the grinding disc; The scraper (53) has a limiting groove (57) on its side wall that is adapted to the limiting strip (56). When the limiting strip (56) and the limiting groove (57) abut against each other, the scraper (53) is perpendicular to the side wall of the support frame (4).

11. A method for operating a vertical mill air inlet and discharge device, comprising the vertical mill air inlet and discharge device as described in any one of claims 1-10, characterized in that, The working method includes: During grinding, the grinding disc device (3) rotates in the forward direction, and the support frame (4) rotates synchronously until the bottom wall of the cleaning part (5) abuts against the guide strip (6). The cleaning part (5) flips inward and moves upward. Compressed air is spirally transported to the grinding cylinder (2) through the air ring (10). When cleaning the air inlet duct (1), the grinding disc device (3) rotates in the opposite direction. The cleaning part (5) is squeezed outward by the material supported in the air inlet duct (1) to scrape off and guide the material on the bottom wall of the air inlet duct (1). When the cleaning part (5) comes into contact with the guide strip (6), it moves upward and the guide strip (6) cleans the material remaining on the side wall of the cleaning part (5).

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